[go: up one dir, main page]

WO2009104492A1 - Dispositif d'affichage d'image - Google Patents

Dispositif d'affichage d'image Download PDF

Info

Publication number
WO2009104492A1
WO2009104492A1 PCT/JP2009/052171 JP2009052171W WO2009104492A1 WO 2009104492 A1 WO2009104492 A1 WO 2009104492A1 JP 2009052171 W JP2009052171 W JP 2009052171W WO 2009104492 A1 WO2009104492 A1 WO 2009104492A1
Authority
WO
WIPO (PCT)
Prior art keywords
potential
electrode
luminance
transistor
period
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2009/052171
Other languages
English (en)
Japanese (ja)
Inventor
芳直 小林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyocera Corp
Original Assignee
Kyocera Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyocera Corp filed Critical Kyocera Corp
Priority to JP2009554274A priority Critical patent/JP4989734B2/ja
Priority to TW098105336A priority patent/TWI425475B/zh
Publication of WO2009104492A1 publication Critical patent/WO2009104492A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G09G3/3241—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G09G3/3241—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
    • G09G3/325—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror the data current flowing through the driving transistor during a setting phase, e.g. by using a switch for connecting the driving transistor to the data driver
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/04—Display protection
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2077—Display of intermediate tones by a combination of two or more gradation control methods
    • G09G3/2081—Display of intermediate tones by a combination of two or more gradation control methods with combination of amplitude modulation and time modulation

Definitions

  • the present invention relates to an image display device.
  • a large number of circuits (pixel circuits) constituting a pixel including an organic EL element are arranged, and the gate voltage of a transistor connected in series with the organic EL element is appropriately set, so that the light emission luminance of the organic EL element is increased.
  • a so-called active matrix type image display device to be adjusted has been proposed (for example, Japanese Patent Application Laid-Open No. 2007-206273).
  • a period for reproducing one frame includes a light emission period in which light is emitted with a substantially constant light emission luminance, and a preparation period in which preparation for light emission is performed. It is configured with. For this reason, the image quality changes depending on the so-called duty (the ratio of the light emission period in one frame period). For example, for a viewer, when the duty is reduced, the movement of the moving body is felt lighter than the real thing, and when the duty is increased, the movement of the moving body is felt awkward than the real thing.
  • duty the ratio of the light emission period in one frame period
  • the image does not feel as bright as the luminance.
  • the waveform indicating the change in the light emission luminance of the organic EL element in the so-called passive matrix type image display device is a narrow pulse waveform, and the light emission time for each line becomes shorter as the number of pixel lines increases. For this reason, in the passive matrix type image display device, there is a drawback that the movement of the moving body is felt to be too light compared to the real object and it is difficult to obtain a high-luminance image.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide an image display technique capable of reproducing a high-quality moving image that makes a human eye feel clear and bright while suppressing deterioration of the panel.
  • an image display device includes a light-emitting element whose emission luminance is adjusted by a flowing current, and a high-luminance period in which the light-emitting element emits light at a first luminance.
  • a control unit that switches to a luminance decay period in which the light emission luminance attenuates from the first luminance to the second luminance.
  • the time from when the light emitting element starts light emission until the light emission luminance of the light emitting element reaches the first luminance is from the first luminance in the luminance decay period to the second luminance. It takes less time to decay to brightness.
  • FIG. 1 is a diagram showing a configuration example of an image display device according to first to fourth embodiments of the present invention.
  • FIG. 2 is a circuit diagram illustrating the pixel circuit according to the first embodiment of the invention.
  • FIG. 3 is a timing chart showing an operation example of the pixel circuit according to the first embodiment of the present invention.
  • FIG. 4 is a schematic view illustrating a light emission luminance pattern.
  • FIG. 5 is a schematic view illustrating a light emission luminance pattern.
  • FIG. 6 is a schematic view illustrating a light emission luminance pattern.
  • FIG. 7 is a circuit diagram illustrating a pixel circuit according to the second embodiment of the invention.
  • FIG. 8 is a timing chart showing an operation example of the pixel circuit according to the second embodiment of the present invention.
  • FIG. 1 is a diagram showing a configuration example of an image display device according to first to fourth embodiments of the present invention.
  • FIG. 2 is a circuit diagram illustrating the pixel circuit according to the first embodiment of the invention.
  • FIG. 9 is a circuit diagram illustrating a pixel circuit according to the third embodiment of the invention.
  • FIG. 10 is a timing chart showing an operation example of the pixel circuit according to the third embodiment of the present invention.
  • FIG. 11 is a circuit diagram illustrating a pixel circuit according to the fourth embodiment of the invention.
  • FIG. 12 is a circuit diagram illustrating pixel circuits of first and second modifications according to the simultaneous lighting method of the invention.
  • FIG. 13 is a timing chart showing an operation example of the pixel circuit of the first modification according to the simultaneous lighting method of the present invention.
  • FIG. 14 is a timing chart showing an operation example of the pixel circuit of the second modification according to the simultaneous lighting system of the present invention.
  • the term “electrically connected” means that one member and the other member are always connected in a conductive manner via wiring or the like, and one member and the other member Is used in a sense that includes not only conductive wiring and the like, but also a mode of being indirectly connected by other members.
  • the term “electrically connected” means that one member and the other member are connected to each other depending on the state of other members (for example, a state in which current can flow between the source and the drain of the transistor). It is used in the meaning including a mode in which the wiring and other members are conductively connected.
  • gate voltage in this specification refers to a potential difference between a source and a gate with respect to a source potential with respect to a transistor.
  • the “transistor threshold voltage” in this specification refers to a gate voltage that becomes a boundary when a transistor changes from an off state (a state in which a drain current does not flow) to an on state (a state in which a drain current flows).
  • An image display device 100A illustrated in FIG. 1 is an electronic device including a display panel that displays various images such as moving images and still images.
  • this image display device 100A for example, a relatively large device such as a thin television or a relatively small device such as a mobile phone can be considered.
  • the image display device 100A includes a control unit 111A, an operation unit 112, an X driver X d A, a dedicated driver S d A, and a display panel 121A.
  • the control unit 111A performs overall control of the operation of the image display device 100A.
  • the control unit 111A includes, for example, a CPU, a RAM, a ROM, and the like, and realizes various operations and controls by the CPU reading and executing a program stored in the ROM or the like.
  • the control unit 111A also has a function of controlling transmission of signals from the X driver X d A and the dedicated driver S d A. Note that some or all of the functions of the control unit 111A may be realized by, for example, a dedicated logic circuit.
  • the operation unit 112 includes, for example, various buttons, and sends various signals to the control unit 111A when the various buttons are pressed.
  • the display panel 121A has a large number of pixel circuits 1A arranged in a matrix.
  • the pixel circuit 1A includes an organic EL element OLED, first to fourth transistors Q1 to Q4, and first and second capacitors C1 and C2.
  • the organic EL element OLED is a light emitting element that has a light emitting layer containing an organic substance as a main component and whose emission luminance varies depending on the amount of current (current amount) flowing through the light emitting layer.
  • the organic EL element OLED has an anode electrode E a and the cathode electrode E c.
  • the anode electrode E a is conductively connected to the connection point Pt1 the power supply line for imparting a high positive potential during light emission of the organic EL element OLED.
  • the cathode electrode E c is electrically connected to an electrode (ground electrode) grounded via the first transistor Q1. Then, the organic EL element OLED, the light emitting luminance is controlled by current between the anode electrode E a and the cathode electrode E c.
  • the first to fourth transistors Q1 to Q4 are thin film transistors (TFTs) that are a type of field effect transistor (FET: Field Effect Transistor) adopting a MIS (Metal Insulator Semiconductor) structure in which carriers are electrons (n-type). Film Transistor), that is, an n-MISFET TFT.
  • TFTs thin film transistors
  • FET Field Effect Transistor
  • MIS Metal Insulator Semiconductor
  • the first transistor Q1 has first to third electrodes E1 to E3.
  • the first electrode E1 is electrically connected to the cathode electrode E c
  • the second electrode E2 is grounded electrode, with respect to the 16 electrodes E16 of the fifth electrode E5, and the second capacitor C2 of the second transistor Q2 Are each electrically connected.
  • the organic EL element OLED emits light, that is, when a forward current flows through the organic EL element OLED
  • the first electrode El functions as a drain electrode (hereinafter abbreviated as “drain”)
  • the second The electrode E2 functions as a source electrode (hereinafter abbreviated as “source”).
  • the third electrode E3 functions as a gate electrode (hereinafter abbreviated as “gate”), and is electrically connected to the eighth electrode E8 of the third transistor Q3 and the thirteenth electrode E13 of the first capacitor C1. .
  • gate a gate electrode
  • the first transistor Q1 has a state in which a current can flow between the drain and the source (conduction state) and a state in which a current cannot flow between the drain and the source due to the potential of the third electrode E3 that is a gate. (Non-conducting state) is selectively set.
  • the first transistor Q1 has a lower limit of a gate voltage (specifically, a potential difference between the second electrode E2 and the third electrode E3 with reference to the potential of the second electrode E2) in a conductive state.
  • a value (threshold voltage of the first transistor Q1) V th exists.
  • the second transistor Q2 has fourth to sixth electrodes E4 to E6.
  • the fourth electrode E4 is electrically connected to wiring that connects the fourteenth electrode E14 of the first capacitor C1, the tenth electrode E10 of the fourth transistor Q4, and the fifteenth electrode E15 of the second capacitor C2 in a conductive manner. Is done. That is, the fourth electrode E4 is electrically connected to the tenth electrode E10, the fourteenth electrode E14, and the fifteenth electrode E15.
  • the fifth electrode E5 is electrically connected to the sixteenth electrode E16 of the second capacitor C2, and is also electrically connected to the wiring that grounds the second electrode E2. That is, the fifth electrode E5 is electrically connected to the sixteenth electrode E16, the second electrode E2, and the ground electrode.
  • the sixth electrode E6 is electrically connected to the reset line L rs and functions as a gate. Therefore, in the second transistor Q2, the potential applied to the sixth electrode E6 that is the gate, specifically, the voltage between the gate and the source, that is, between the fourth electrode E4 and the fifth electrode E5, that is, the drain and The current to and from the source is adjusted.
  • the fourth electrode E4 is connected to the third electrode E3 via the first capacitor C1, and the fourth electrode E4 and the fifth electrode are changed by changing the potential applied to the sixth electrode E6.
  • the current between E5 is adjusted.
  • the charge accumulated in the fourteenth electrode E14 of the first capacitor C1 is released to the ground electrode via the second transistor Q2, thereby adjusting the gate voltage of the first transistor Q1.
  • the second transistor Q2 only needs to perform a function necessary for extracting the charge applied to the fourteenth electrode E14 to the ground electrode. Therefore, if the electric capacity and the size of the transistor are proportional, for example, it may have a structural size of about 1/10 of the first transistor Q1 through which a large current for light emission flows.
  • the third transistor Q3 has seventh to ninth electrodes E7 to E9. Then, the seventh electrode E7 is electrically connected cathode electrode E c and the first electrode E1 against conductively connected to the wiring.
  • the eighth electrode E8 is electrically connected to a wiring that connects the third electrode E3 and the thirteenth electrode E13 in a conductive manner.
  • the ninth electrode E9 is electrically connected to the sense line L sn and functions as a gate. Therefore, the third transistor Q3 has a non-conductive state in which a current can flow between the drain and the source and a current that cannot flow between the drain and the source due to the potential applied to the ninth electrode E9 that is a gate. It is selectively set to the conductive state.
  • the light emission luminance of the organic EL element OLED is controlled by the current value, the light emission luminance fluctuates sensitively to fluctuations in the gate voltage V gs of the first transistor Q1 during light emission.
  • the threshold voltage (abbreviated as “threshold” as appropriate) V th tends to be different for each first transistor Q1. Therefore, in the image display device 100A, the third transistor Q3 is provided in order to realize processing (V th compensation processing) for compensating for variation in the threshold value V th in the first transistor Q1.
  • the fourth transistor Q4 has tenth to twelfth electrodes E10 to E12.
  • the tenth electrode E10 is electrically connected to the fourth electrode E4, the fourteenth electrode E14, and the fifteenth electrode E15.
  • the eleventh electrode E11 is electrically connected to the image signal line Ldt .
  • the twelfth electrode E12 is electrically connected to the scanning signal line L sl and functions as a gate. Therefore, the fourth transistor Q4 has a conductive state in which a current can flow between the drain and the source and a current incapable of flowing between the drain and the source due to the potential applied to the twelfth electrode E12 that is a gate. It is selectively set to the conductive state.
  • the first capacitor C1 has a thirteenth electrode E13 and a fourteenth electrode E14.
  • the thirteenth electrode E13 is electrically connected to the third electrode E3 and the eighth electrode E8, and the fourteenth electrode E14 is connected to the fourth electrode E4, the tenth electrode E10, and the fifteenth electrode E15. Electrically connected.
  • the holding capacity of the first capacitor C1 is set to a predetermined value (for example, 1 pF).
  • the second capacitor C2 has a fifteenth electrode E15 and a sixteenth electrode E16.
  • the fifteenth electrode E15 is electrically connected to the fourth electrode E4, the tenth electrode E10, and the fourteenth electrode E14, and the sixteenth electrode E16 is the second electrode E2, the fifth electrode E5, and the ground Electrically connected to the electrode.
  • the holding capacity of the second capacitor C2 is set to a predetermined value (for example, 1 pF).
  • L dt is electrically connected
  • a common scanning signal line L sl is electrically connected to the plurality of pixel circuits 1A arranged in the row direction (left-right direction in FIG. 1). That is, the display panel 121A is configured as a so-called active matrix type display panel.
  • the image signal line L dt supplies each pixel with a potential corresponding to an image signal corresponding to the light emission luminance (for example, a pixel data signal for each pixel).
  • the scanning signal line L sl is provided so as to be substantially orthogonal to the image signal line, and supplies a scanning signal to each pixel.
  • the scanning signal is a signal that controls the timing at which charges corresponding to the pixel data signal are accumulated in each pixel via the image signal line Ldt .
  • the X driver X d A supplies a potential (hereinafter also referred to as “image signal line potential”) V dt corresponding to the pixel data signal to the image signal line L dt in response to a signal from the control unit 111A.
  • the control unit 111A synchronizes with an image signal transmitted from the outside, and outputs a signal for controlling the supply timing of the potential according to the pixel data signal for each image signal line L dt from the X driver X d A. Send to X driver X d A.
  • the dedicated driver S d A gives a potential to the sense line L sn , the scanning signal line L sl , the reset line L rs , and the connection point Pt 1 with a waveform corresponding to the control signal from the control unit 111 A.
  • the dedicated driver S d A includes, for example, first to fourth shift registers, and based on data stored in the first to fourth shift registers, the sense line L sn , the scanning signal line L sl , and the reset line L It has a function of applying a potential to rs and the connection point Pt1.
  • the first shift register holds data of a potential V sn applied to the sense line L sn (hereinafter also referred to as “sense line potential”).
  • sense line potential V sn two values of a predetermined high potential V gH and a predetermined low potential V gL are appropriately employed.
  • the second shift register holds data of potential (hereinafter also referred to as “scanning signal line potential”) V sl applied to the scanning signal line L sl .
  • scanning signal line potential two values of a predetermined high potential V gH and a predetermined low potential V gL are appropriately employed as the scanning signal line potential V sl .
  • the third shift register holds data of potential (hereinafter also referred to as “reset line potential”) V rs applied to the reset line L rs .
  • reset line potential V rs a predetermined high potential V gH (for example, +15 V), a predetermined low potential V gL (for example, 0 V), and a predetermined potential between the high potential V gH and the low potential V gL
  • medium potential V gM for example, + 6V
  • the potential applied to the sixth electrode E6 is set to the low potential V gL , the medium potential V gM , and the high potential V gH in a predetermined order for the light emission of the organic EL element OLED corresponding to each frame.
  • the fourth shift register also referred to as the "power supply line potential" for holding the data of V 1 potential applied to the connection point Pt1 i.e. power line.
  • the power supply line potential V 1 three values of a predetermined high potential V 1H (for example, +10 V), a reference potential (for example, 0 V) GND, and a predetermined low potential V 1L (for example, ⁇ 10 V) are appropriately adopted. Is done.
  • the sense line potential V sn , the scanning signal line potential V sl , the reset line potential V rs , and the power supply line potential V 1 controlled by the first to fourth shift registers have waveforms corresponding to the control signal from the control unit 111A. Respectively.
  • the horizontal axis indicates time, and in order from the top, (a) sense line potential (abbreviated as “potential” as appropriate) V sn , (b) image signal line potential (abbreviated as “potential” as appropriate) V dt , (c) scanning signal line potential (abbreviated as “potential” as appropriate) V sl , (d) reset line potential (abbreviated as “potential” as appropriate) V rs , (e) power supply line potential applied to the connection point Pt1 (as appropriate)
  • the waveform of V 1 is abbreviated as “potential”.
  • a preparation period P p (time t2 to t19) in which light emission is not performed and preparation for adjusting the light emission luminance is performed, and a light emission period P e in which the organic EL element OLED actually emits light.
  • the light emission period Pe includes a period in which the luminance gradually increases from the initial stage to the middle stage and emits light with relatively high brightness (also referred to as “high brightness period”) Pe 1, and the light emission brightness gradually decreases from the middle stage to the final stage.
  • Period P e 2 (also referred to as “luminance decay period”).
  • the potential V rs of the reset line L rs is set from the middle potential V gM to the low potential V gL.
  • the potential V sn of the sense line L sn is set to the low potential V gL
  • the potential V dt of the image signal line L dt is set to a reference potential GND
  • the potential V sl of the scanning signal line L sl low potential V is set to gL
  • potential V 1 of the connection point Pt1 is set to a high potential V IH.
  • the second transistor Q2 is shifted from the conductive state to the non-conductive state.
  • the potential V 1 of the connection point Pt1 is set to the reference potential GND from the high potential V IH.
  • the anode electrode E a and the cathode electrode E c of the organic EL element OLED there is no potential difference between the anode electrode E a and the cathode electrode E c of the organic EL element OLED, a state of the organic EL element OLED can not emit light.
  • the potential V 1 at the connection point Pt1 is set to the low potential V 1L from the reference potential GND.
  • the organic EL element OLED functions as a capacitor and charges the organic EL element OLED. Is accumulated. Therefore, (here, only a low potential potential V 1L) an anode electrode E a side relatively low potential so that the potential difference is generated between the anode electrode E a and the cathode electrode E c.
  • the potential V rs reset line L rs is set from the low potential V gL to the high potential V gH.
  • the second transistor Q2 becomes conductive, and the fourteenth electrode E14 of the first capacitor C1 is grounded.
  • the potential V sn of the sense line L sn is set from the low potential V gL to the high potential V gH.
  • the third transistor Q3 becomes conductive.
  • the potential V 1 at the connection point Pt1 is set from the low potential V 1L to the reference potential GND.
  • the potential of the potential and the second electrode E2 of the anode electrode E a is the same potential as 0V, respectively.
  • the charge accumulated in the organic EL element OLED is applied to the third electrode E3, and the first transistor Q1 becomes conductive.
  • the third electrode E3 and the cathode electrode E c and stored charge to have a first electrode E1 will escape to the ground electrode via the second electrode E2, a gate voltage V gs of the first transistor Q1
  • the threshold value Vth of the first transistor Q1 is reached, the first transistor Q1 is turned off. That is, so-called Vth compensation processing is performed from time t9 to t10.
  • the potential V sn of the sense line L sn is set from the high potential V gH to the low potential V gL.
  • the third transistor Q3 becomes non-conductive, and the gate voltage of the first transistor Q1 is held at the threshold value Vth .
  • the potential V rs reset line L rs is set from the high potential V gH to the low potential V gL.
  • the second transistor Q2 is turned off, and the state where the fourteenth electrode E14 is grounded is released.
  • the potential V sl of the scanning signal line L sl is set from the low potential V gL to the high potential V gH.
  • the fourth transistor Q4 is set from the non-conductive state to the conductive state.
  • the potential V dt is applied to the fourteenth electrode E14. That is, a potential corresponding to an image signal (specifically, a pixel data signal) is applied via the capacitor C1 on the threshold value Vth that has already been applied to the third electrode E3.
  • the potential applied to the third electrode E3 is set to a light emission potential corresponding to the pixel data signal (hereinafter also referred to as “light emission potential”).
  • This potential setting process is performed by the image signal line Ldt and the scanning signal line Lsl . If the second to fourth transistors Q2 to Q4 are turned off, the potential applied to the third electrode E3 is for light emission. The state set to the potential is maintained.
  • the potential V sl of the scanning signal line L sl is set from the high potential V gH to the low potential V gL.
  • the fourth transistor Q4 is set from the conductive state to the non-conductive state.
  • the potential V dt of the image signal line L dt is set to the reference potential GND of any positive potential V dH corresponding to the pixel data signal.
  • the potential V 1 at the connection point Pt1 is set to the high potential V 1H from the reference potential GND.
  • a forward voltage is applied to the organic EL element OLED, and the gate voltage of the first transistor Q1 is set to a value obtained by adding a value corresponding to the pixel data signal to the threshold value Vth . Therefore, a current corresponding to the pixel data signal starts to flow between the first electrode E1 and the second electrode E2. That is, a current corresponding to the pixel data signal flows through the organic EL element OLED, and the organic EL element OLED starts to emit light with a luminance corresponding to the pixel data signal.
  • the dedicated driver S d A controls the potential of the power supply line to which the potential V 1 is applied, so that the potential of the third electrode E3 is set to the potential for light emission, and the anode electrode E a and the second electrode A predetermined potential difference is applied to E2, and the organic EL element OLED emits light.
  • the potential V rs reset line L rs is set to the medium potential V gM from the low potential V gL.
  • the intermediate potential V gM is applied to the sixth electrode E6, and the second transistor Q2 can conduct current between the fourth electrode E4 and the fifth electrode E5 by an amount corresponding to the intermediate potential V gM. It becomes a state. Therefore, after time t20 (specifically, from time t20 to time t2 relating to the next light emission), the potential maintained between the fourteenth electrode E14 and the fifteenth electrode E15, that is, the electric charge is the second transistor Q2. Through the ground electrode.
  • the potential applied to the third electrode E3 gradually decreases, the amount of current flowing between the first electrode E1 and the second electrode E2 of the first transistor Q1 gradually decreases, and the organic EL
  • the light emission luminance of the element OLED gradually attenuates.
  • only the electric charge corresponding to the potential V dt corresponding to the pixel data signal is removed so that the emission luminance is gradually reduced so that the difference in the light emission state between the pixel having the relatively small threshold V th and the pixel having the relatively large threshold V th does not occur. It is reduced to.
  • the horizontal axis indicates the time elapsed from the start of light emission, and the light emission luminance of the organic EL element OLED in the case where the gate voltage V gs of the first transistor Q1 at the start of light emission is set to five different voltages. Each pattern is shown. The five patterns are indicated by a thick line, a thick broken line, a thin line, a thin alternate long and short dash line, and a thin broken line, respectively. Also, the five patterns shown in FIG. 4 are shown for two consecutive light emission.
  • the light emission luminance gradually increases during one light emission period, and becomes substantially constant at high luminance (peak luminance) as the first luminance.
  • a period (hereinafter also referred to as “brightness decay period”) in which the light emission brightness gradually attenuates from the first brightness to the second brightness.
  • the high luminance period since the current flowing between the drain and source of the first transistor Q1 reaches the maximum value and is held at the maximum value, the light emission luminance is high and substantially after the light emission luminance gradually increases. It becomes constant.
  • the potential that is, the electric charge held between the fourteenth electrode E14 and the fifteenth electrode E15 gradually escapes to the ground electrode through the second transistor Q2, so that the first transistor Since the gate voltage V gs of Q1 gradually decreases, the light emission luminance gradually decreases.
  • the time from the predetermined high luminance (peak luminance) corresponding to the pixel data signal to 1 / e of the peak luminance is T, and the luminance attenuation period starts. If the elapsed time from t is t, the attenuation of the gate voltage V gs of the first transistor Q1 during the luminance attenuation period is expressed by the relationship of the following equation (1).
  • V gs V th + V dt ⁇ exp ⁇ t / T (1)
  • V th is the threshold voltage of the first transistor Q1
  • V dt is the signal potential corresponding to the image signal in the light emission potential.
  • the second transistor The gate voltage V gs of the first transistor Q1 is adjusted by Q2.
  • the organic EL element OLED switches from a high luminance period in which light is emitted at a peak luminance corresponding to the pixel data signal to a luminance attenuation period in which the light emission luminance of the organic EL element OLED is attenuated from the peak luminance.
  • control unit 111A changes the potential applied to the sixth electrode E6 from the low potential V gL to the medium potential V gM , thereby switching from the high luminance period P e 1 to the luminance decay period P e 2. It is done. Note that the time from when the organic EL element OLED starts to emit light until the light emission luminance of the organic EL element OLED reaches the first luminance is the time until the luminance decreases from the first luminance to the second luminance. Is set shorter. For this reason, the movement of the moving body in the moving image can be made more natural to human eyes.
  • the emission luminance attenuation curve can be a controlled curve.
  • the human eye feels the screen is relatively dark and the moving body feels light.
  • “light” refers to a state in which the interval between displayed images is wide, and thus the image feels as if it is moving instantaneously, and the video itself feels unstable.
  • the amount of leakage per unit time decreases, the light emission time as a whole becomes longer as shown in FIG. 6, that is, the duty increases, so that the human eye feels the screen relatively bright and the movement of the moving object Feels heavy.
  • “heavy” means a state in which the displayed image feels as if it moves with lumps, since the interval between displayed images is too small.
  • the characteristics (attenuation characteristics) that the current flowing through the organic EL element OLED attenuates are changed, and the image quality of the animation is changed to realize a movie that looks bright and natural to the human eye. can do.
  • the overall luminance of one light emission period P e (value obtained by time integration of the light emission luminance of the light emission period P e) is a relatively small by attenuation of the light emission luminance, the pixel data signal The light emission with the peak luminance corresponding to is performed. For this reason, when frames of a predetermined number (for example, 60) or more are sequentially displayed per second, it seems to human eyes to continuously emit light at peak luminance during the light emission period. Therefore, when the peak luminance is set appropriately, it is possible to realize an image that feels bright with less power, and when the amount of leakage is adjusted appropriately, it appears bright and natural to the human eye without increasing power consumption as much as possible. A video is realized.
  • the electric charge corresponding to the potential V dt corresponding to the pixel data signal is gradually extracted to the ground electrode. For example, until the electric potential applied to the fourteenth electrode E14 reaches almost zero according to the electric potential V dt. When the emission luminance is attenuated, it is preferable to give a feeling that each frame is switched naturally.
  • the emission luminance it is preferable to attenuate the emission luminance to a luminance lower than 1/10 of the peak luminance, and it is more preferable to attenuate the emission luminance to a luminance lower than 1/100 or less of the peak luminance.
  • the organic EL element OLED is a self-luminous element, the influence on the contrast is small even for bright pixels and dark pixels.
  • the control unit 111A a plurality of pixel circuits 1A arranged in the display panel 121A, substantially initiated emission at the same time, substantially the luminance decay from the high luminance period P e 1 simultaneously
  • the period is switched to P e 2. That is, the emission luminance starts to attenuate at the same timing in the entire screen, and the emission luminance gradually attenuates toward zero. In addition, you may attenuate for every predetermined area
  • the emission intensity peak luminance It is switched to the luminance decay period P e 2 that decays. For this reason, light emission of the next frame can be performed after gradually reducing the light emission luminance while suppressing the maximum value of the light emission luminance of the organic EL element OLED. Therefore, it is possible to reproduce a high-quality moving image that makes the human eye feel clear and bright while suppressing deterioration of the display panel 121A.
  • the absolute value of the gate voltage V gs of the first transistor Q1 that adjusts the light emission of the organic EL element OLED is attenuated according to an exponential function. For this reason, the movement of the moving body in the moving image can be made more natural to human eyes.
  • the light emission luminance of the plurality of organic EL elements OLED starts to attenuate substantially simultaneously, and decreases to the extent that it is not perceived by noise almost simultaneously (that is, the luminance allowed by contrast). For this reason, for example, it is possible to avoid an unnatural image in which a plurality of organic EL elements OLED disappear in time sequence.
  • the cathode electrode E c of the organic EL element OLED, a first transistor Q1 to adjust the current of the organic EL element OLED is connected.
  • the anode electrode E a of the organic EL element OLED, a first transistor Q21 which regulates the current of the organic EL element OLED is connected.
  • the image display device 100B according to the second embodiment is substantially the same in overall configuration as the image display device 100A according to the first embodiment, but the pixel circuit 1A is changed to the pixel circuit 1B, and the display panel 121A. Is changed to the display panel 121B in which a plurality of pixel circuits 1B are arranged, the control unit 111A is changed to the control unit 111B that controls different operations, and the dedicated driver S d A is changed to the dedicated driver S d B. It has become.
  • the same portions as those of the image display device 100A according to the first embodiment will be denoted by the same reference numerals, and description thereof will be omitted, but different portions will be described.
  • the pixel circuit 1B according to the second embodiment of FIG. 7 includes an organic EL element OLED, first to fourth transistors Q21 to Q24, and first and second capacitors C21 and C22.
  • the cathode electrode of the organic EL element OLED E c is conductively connected to the connection point Pt22 the power supply line for imparting a negative potential during light emission of the organic EL element OLED.
  • the anode electrode E a of the organic EL element OLED is electrically conductive connected to the connection point Pt21 through the first transistor Q21.
  • the first to fourth transistors Q21 to Q24 are configured by n-MISFET TFTs similarly to the first to fourth transistors Q1 to Q4 according to the first embodiment.
  • the first transistor Q21 has first to third electrodes E21 to E23.
  • the first electrode E21 is electrically connected to the anode electrode E a , the fifth electrode E25 of the second transistor Q22, and the sixteenth electrode E36 of the second capacitor C22.
  • the second electrode E22 is electrically connected to the connection point Pt21 and the seventh electrode E27 of the third transistor Q23.
  • the organic EL element OLED emits light, that is, when a forward current flows through the organic EL element OLED, the second electrode E22 functions as a drain and the first electrode E21 functions as a source.
  • the third electrode E23 functions as a gate and is electrically connected to the eighth electrode E28 of the third transistor Q23 and the thirteenth electrode E33 of the first capacitor C21.
  • the potential between the first electrode E21 and the second electrode E22, that is, the drain and the potential applied to the third electrode E23 that is the gate specifically, the voltage between the gate and the source.
  • the current to and from the source is adjusted.
  • the current amount and the light emission luminance in the organic EL element OLED are controlled.
  • the first transistor Q21 has a non-conductive state in which a current can flow between the drain and the source and a current that cannot flow between the drain and the source due to the potential applied to the third electrode E23 that is a gate. It is selectively set to the conductive state.
  • the first transistor Q21 has a lower limit of a gate voltage (specifically, a potential difference between the first electrode E21 and the third electrode E23 with reference to the potential of the first electrode E21) when the conductive state is established.
  • a value (threshold voltage of the first transistor Q21) V th exists.
  • the second transistor Q22 has fourth to sixth electrodes E24 to E26.
  • the fourth electrode E24 is electrically connected to the fourteenth electrode E34 of the first capacitor C21, the tenth electrode E30 of the fourth transistor Q24, and the fifteenth electrode E35 of the second capacitor C22.
  • the fifth electrode E25 is electrically connected to the second 16 electrode E36 and the anode electrode E a and the first electrode E21 of the second capacitor C22.
  • the sixth electrode E26 is electrically connected to the sense line L sn and functions as a gate.
  • the potential between the fourth electrode E24 and the fifth electrode E25, that is, the drain, and the like are determined by the potential applied to the sixth electrode E26 that is the gate, specifically, the voltage between the gate and the source. The current to and from the source is adjusted.
  • the fourth electrode E24 is connected to the third electrode E23 via the first capacitor C21, and the potential applied to the sixth electrode E26 is changed, so that the fourth electrode E24 and the fifth electrode are changed.
  • the current between E25 is adjusted.
  • the gate voltage of the first transistor Q21 is adjusted by the charge accumulated in the fourteenth electrode E34 of the first capacitor C21 passing through the second transistor Q22 and the organic EL element OLED to the connection point Pt22.
  • the second transistor Q22 may perform a function necessary for extracting the charge applied to the fourteenth electrode E34 to the ground electrode. Therefore, if the capacitance is proportional to the size of the transistor, for example, it may have a structural size about 1/10 of the first transistor Q21 through which a large current for light emission flows.
  • the second transistor Q22 realizes V th compensation processing for compensating for variations in the threshold value V th in the first transistor Q21.
  • the third transistor Q23 has seventh to ninth electrodes E27 to E29.
  • the seventh electrode E27 is electrically connected to the second electrode E22 and the connection point Pt21.
  • the eighth electrode E28 is electrically connected to the third electrode E23 and the thirteenth electrode E33.
  • the ninth electrode E29 is electrically connected to the reset line L rs and functions as a gate.
  • the third transistor Q23 has a non-conductive state in which a current can flow between the drain and the source and a current that cannot flow between the drain and the source due to the potential applied to the ninth electrode E29 that is a gate. It is selectively set to the conductive state.
  • the fourth transistor Q24 has tenth to twelfth electrodes E30 to E32.
  • the tenth electrode E30 is electrically connected to the fourth electrode E24, the fourteenth electrode E34, and the fifteenth electrode E35.
  • the eleventh electrode E31 is electrically connected to the image signal line Ldt .
  • the twelfth electrode E32 is electrically connected to the scanning signal line L sl and functions as a gate.
  • the fourth transistor Q24 has a conductive state in which a current can flow between the drain and the source and a current incapable of flowing between the drain and the source due to the potential applied to the twelfth electrode E32 that is a gate. It is selectively set to the conductive state.
  • the first capacitor C21 has a thirteenth electrode E33 and a fourteenth electrode E34.
  • the thirteenth electrode E33 is electrically connected to the third electrode E23 and the eighth electrode E28, and the fourteenth electrode E34 is electrically connected to the fourth electrode E24, the tenth electrode E30, and the fifteenth electrode E35.
  • the holding capacity of the first capacitor C21 is set to a predetermined value (for example, 1 pF).
  • the second capacitor C22 has a fifteenth electrode E35 and a sixteenth electrode E36.
  • 15 electrode E35 has a fourth electrode E24 and the tenth electrode E30 is connected fourteenth electrode E34 and the electrically respect
  • the 16 electrode E36 has a fifth electrode E25 and the anode electrode E a first electrode E21 And are electrically connected to each other.
  • the holding capacity of the second capacitor C22 is set to a predetermined value (for example, 1 pF).
  • L dt is electrically connected
  • a common scanning signal line L sl is electrically connected to the plurality of pixel circuits 1B arranged in the row direction (left-right direction in FIG. 1). That is, the display panel 121B is configured as a so-called active matrix type display panel.
  • Dedicated driver S d B is the waveform corresponding to the control signal from the control unit 111B, a reset line L rs, sense line L sn, confers potential to the scanning signal line L sl, and the connection point PT22.
  • the dedicated driver S dB is configured to include, for example, 21st to 24th shift registers, and based on the data stored in the 21st to 24th shift registers, the reset line L rs , the sense line L sn , the scanning signal line It has a function of applying a potential to L sl and connection point Pt22.
  • the 21st shift register holds data of the reset line potential V rs .
  • the reset line potential V rs two values of potentials V gH and V gL are appropriately adopted.
  • the twenty-second shift register holds data of the sense line potential V sn .
  • a high potential V gH e.g., + 15V
  • a low potential V gL for example, -10 V
  • the high potential V gH and the potential V gM in between the low potential V gL For example, three values of 0V
  • the potential applied to the sixth electrode E26 is set to the low potential V gL , the medium potential V gM , and the high potential V gH in a predetermined order.
  • the The 23rd shift register holds data of the scanning signal line potential V sl .
  • the scanning signal line potential V sl two values of the potentials V gH and V gL are appropriately employed.
  • the 24th shift register holds data of the potential (power supply line potential) V 22 applied to the connection point Pt 22 , that is, the power supply line.
  • V 22 As the power supply line potential V 22 , three values of a positive high potential V 1H (for example, +10 V), a reference potential (for example, 0 V) GND, and a negative low potential V 1L (for example, ⁇ 10 V) are appropriately adopted. Is done.
  • the reset line potential V rs , sense line potential V sn , scanning signal line potential V sl , and power supply line potential V 22 controlled by the 21st to 24th shift registers have waveforms corresponding to the control signal from the control unit 111B. Respectively.
  • the drive waveform shown in FIG. 8 is repeated in time sequence by the number of times corresponding to the number of frames. Note that the drive waveform shown in FIG. 8 is realized under the control of the control unit 111B.
  • the horizontal axis indicates time, and in order from the top, (a) reset line potential V rs , (b) sense line potential V sn , (c) image signal line potential V dt , (d) scanning signal line potential. Waveforms of V sl and (e) power supply line potential V 22 are shown.
  • a preparation period P p (time T2 to T18) in which light emission is not performed and preparation for adjusting the light emission luminance is performed, and a light emission period P e in which the organic EL element OLED actually emits light.
  • the light emission period Pe includes a high luminance period P e 1 in which the light emission luminance gradually increases from the initial period to the middle period and emits light at a relatively high luminance, and a luminance in which the light emission luminance gradually decreases from the middle period to the final period.
  • an attenuation period P e 2 is a high luminance period in which the light emission luminance gradually increases from the initial period to the middle period and emits light at a relatively high luminance, and a luminance in which the light emission luminance gradually decreases from the middle period to the final period.
  • a predetermined reference potential GND is always applied to the connection point Pt21.
  • potential V sn of the sense line L sn is set from the middle potential V gM to the high potential V gH.
  • the potential V rs reset line L rs is set to the low potential V gL
  • the potential V dt of the image signal line L dt is set to a reference potential GND
  • the potential V sl of the scanning signal line L sl low potential V It is set to gL
  • the potential V 22 at the connection point Pt22 is set to the low potential V 1L.
  • the second transistor Q22 shifts from a conductive state in which a relatively small amount of current can flow to a conductive state in which a relatively large amount of current can flow.
  • the potential V 22 at the connection point Pt22 is set to the reference potential GND from the low potential V 1L.
  • the organic EL element OLED is in a state that can not emit light.
  • the potential V rs reset line L rs is set from the low potential V gL to the high potential V gH.
  • the third transistor Q23 becomes conductive, and the third electrode E23 and the thirteenth electrode E33 are grounded.
  • the potential V 22 at the connection point Pt22 is set to the reference potential GND from the high potential V IH.
  • negative charges accumulated in the anode electrode E a together with acts on the third potential E23 via the first capacitor C21, the connection point through the first electrode E21 and the second electrodes E22 Exit to Pt21.
  • the gate voltage V gs of the first transistor Q21 reaches the threshold value V th of the first transistor Q21, the first transistor Q21 is turned off.
  • a potential difference corresponding to the threshold value Vth is set between the thirteenth electrode E33 and the fourteenth electrode E34 of the first capacitor C21. That is, so-called Vth compensation processing is performed from time T8 to T9.
  • V sn a high potential V gH sense line L sn is set to the low potential V gL
  • the potential V rs reset line L rs from the high potential V gH to the low potential V gL Is done.
  • both the second transistor Q22 and the third transistor Q23 are turned off, and the potential difference between the thirteenth electrode E33 and the fourteenth electrode E34 is maintained at the threshold value Vth .
  • the potential V sl of the scanning signal line L sl is set from the low potential V gL to the high potential V gH.
  • the fourth transistor Q24 is set from the non-conductive state to the conductive state.
  • the potential V dt is applied to the fourteenth electrode E34.
  • a potential for light emission (light emission potential) corresponding to an image signal is applied on the potential difference V th set in the first capacitor C21, and the third electrode E23. Is supplied with a potential obtained by adding a light emission potential to the threshold value V th .
  • the process of setting the potential to be applied to the third electrode E23 to the potential for light emission through the capacitor C21 is performed by the image signal line Ldt and the scanning signal line Lsl , and the second to fourth transistors Q22 to Q24 are non-conductive.
  • the gate voltage V gs is held at a value corresponding to the light emission potential.
  • the potential V sl of the scanning signal line L sl is set from the high potential V gH to the low potential V gL.
  • the fourth transistor Q24 is set from the conductive state to the non-conductive state.
  • the potential V dt of the image signal line L dt is set to the reference potential GND of any positive potential V dH corresponding to the pixel data signal.
  • the potential V 22 at the connection point Pt22 is set from the reference potential GND to the low potential V 1L.
  • a forward voltage is applied to the organic EL element OLED, and the gate voltage V gs of the first transistor Q21 is set to a value obtained by adding a value corresponding to the pixel data signal to the threshold V th .
  • a current corresponding to the pixel data signal starts to flow between the second electrode E22 and the first electrode E21. That is, a current corresponding to the pixel data signal flows through the organic EL element OLED, and the organic EL element OLED starts to emit light with a luminance corresponding to the pixel data signal.
  • a dedicated driver S d B is, by controlling the potential of the power supply line that supplies voltage V 22, in a state where the potential of the third electrode E23 is set to the light-emitting potential, the cathode electrode E c and the second electrode A predetermined potential difference is applied to E22, and the organic EL element OLED emits light.
  • the potential V sn of the sense line L sn is set to the medium potential V gM from the low potential V gL.
  • the intermediate potential V gM is applied to the sixth electrode E26, and the second transistor Q22 conducts so that a current can flow between the fourth electrode E24 and the fifth electrode E25 by an amount corresponding to the intermediate potential V gM. It becomes a state. Accordingly, after time T19 (specifically, from time T19 to time T2 relating to the next light emission), the potential, that is, the charge corresponding to the pixel data signal held between the fourteenth electrode E34 and the fifteenth electrode E35. However, it gradually goes out to the connection point Pt22 via the second transistor Q22.
  • the gate voltage V gs of the first transistor Q21 decreases, and the first electrode E1 and the second electrode E2 of the first transistor Q21 The amount of current flowing between them gradually decreases, and the light emission luminance of the organic EL element OLED gradually attenuates.
  • the temporal change pattern of the light emission luminance of the organic EL element OLED is the same as the pattern according to the first embodiment shown in FIG. 4, and the high luminance period P e 1 and the luminance attenuation period P e 2.
  • a light emission period Pe comprising the above is realized.
  • the attenuation of the gate voltage V gs of the first transistor Q21 in the luminance decay period P e 2 satisfies the relationship expressed by the above equation (1) as in the first embodiment.
  • the second transistor The gate voltage V gs of the first transistor Q21 is adjusted by Q22.
  • the organic EL element OLED switches from the high luminance period P e 1 in which light emission is performed at the peak luminance corresponding to the pixel data signal to the luminance attenuation period P e 2 in which the emission luminance attenuates from the peak luminance.
  • control unit 111B changes the potential applied to the sixth electrode E26 from the low potential V gL to the medium potential V gM , thereby switching from the high luminance period P e 1 to the luminance decay period P e 2. It is done.
  • control unit 111B starts light emission substantially simultaneously in the plurality of pixel circuits 1B arranged on the display panel 121B, and substantially simultaneously starts from the high luminance period P e 1 to the luminance decay period P e. Switch to 2. That is, the emission luminance starts to attenuate at the same timing in the entire screen, and the emission luminance gradually attenuates toward zero.
  • the organic EL is set by setting the potential of the gates of the first transistors Q1 and Q21 by the potential of the image signal line Ldt corresponding to the pixel data signal.
  • the light emission luminance of the element OLED was adjusted.
  • the current flowing through the organic EL element OLED is adjusted by appropriately setting the amount of current supplied to the pixel circuit 1C, and the organic EL element OLED. Is adjusted.
  • the image display device 100C according to the third embodiment has substantially the same overall configuration as the image display devices 100A and 100B according to the first and second embodiments, but the pixel circuits 1A and 1B are replaced with the pixel circuit 1C.
  • the display panels 121A and 121B are changed to the display panel 121C in which a plurality of pixel circuits 1C are arranged, the control units 111A and 111B are changed to the control unit 111C that controls different operations, and the X driver X d A is changed.
  • the driver is changed to the X driver X d C, and the dedicated drivers S d A and S d B are changed to the dedicated driver S d C.
  • the pixel circuit 1C according to the third embodiment in FIG. 9 includes an organic EL element OLED, first to fourth transistors Q41 to Q44, and a first capacitor C41.
  • the anode electrode of the organic EL element OLED E a is conductively connected to the connection point Pt41 the power supply line for imparting positive potential during light emission of the organic EL element OLED.
  • the cathode electrode E c of the organic EL element OLED is electrically connected to the grounded electrode (ground electrode) via the first transistor Q41.
  • the first to fourth transistors Q41 to Q44 are configured by n-MISFET TFTs similarly to the first to fourth transistors Q1 to Q4 and Q21 to Q24 according to the first and second embodiments.
  • the first transistor Q41 has first to third electrodes E41 to E43.
  • the first electrode E41 is electrically connected to the cathode electrode E c, the second electrode E42, compared with the eighth electrode E48 of the third transistor Q43 and the 11th electrode E51 and the ground electrode of the first capacitor C1 Are electrically connected.
  • the organic EL element OLED emits light, that is, when a forward current flows through the organic EL element OLED, the first electrode E41 functions as a drain and the second electrode E42 functions as a source.
  • the third electrode E43 functions as a gate and is electrically connected to the fifth electrode E45 of the second transistor Q42 and the tenth electrode E50 of the first capacitor C41.
  • the potential between the first electrode E41 and the second electrode E42 i.e., the drain
  • the potential applied to the third electrode E43 that is the gate specifically, the voltage between the gate and the source.
  • the current to and from the source is adjusted.
  • the current amount and the light emission luminance in the organic EL element OLED are controlled.
  • the first transistor Q41 has a non-conductive state in which a current can flow between the drain and the source and a current that cannot flow between the drain and the source due to the potential applied to the third electrode E43 that is a gate. It is selectively set to the conductive state.
  • the first transistor Q41 has a lower limit of a gate voltage (specifically, a potential difference between the second electrode E42 and the third electrode E43 with reference to the potential of the second electrode E42) in a conductive state.
  • the value (threshold voltage of the first transistor Q41) V th exists.
  • the second transistor Q42 has fourth to sixth electrodes E44 to E46.
  • the fourth electrode E44 is electrically connected to the seventh electrode E47 and the ninth electrode E49 of the third transistor Q43 and the thirteenth electrode E53 of the fourth transistor Q44.
  • the fifth electrode E45 is electrically connected to the third electrode E43 and the tenth electrode E50 of the first capacitor C41.
  • the sixth electrode E46 is electrically connected to the yield line Lyd and functions as a gate. Therefore, in the second transistor Q42, the potential between the fourth electrode E44 and the fifth electrode E45, that is, the drain and the potential are applied to the sixth electrode E46 that is the gate, specifically, the voltage between the gate and the source. The current to and from the source is adjusted.
  • the fifth electrode E45 is connected to the third electrode E43, and when the potential of the sixth electrode E46 is changed, the current between the fourth electrode E44 and the fifth electrode E45 is adjusted.
  • the charge applied to the third electrode E43 of the first transistor Q41 is released to the ground electrode via the second transistor Q42 and the third transistor Q43, and the gate voltage of the first transistor Q41 is adjusted.
  • the second transistor Q42 only needs to perform a function necessary for extracting the charge of the third electrode E43 of the first transistor Q41 to the ground electrode. Therefore, if the capacitance is proportional to the size of the transistor, for example, it may have a structural size about 1/10 of the first transistor Q41 through which a large current for light emission flows.
  • the third transistor Q43 has seventh to ninth electrodes E47 to E49.
  • the seventh electrode E47 is electrically connected to the fourth electrode E44 of the second transistor Q42, the thirteenth electrode E53 of the fourth transistor Q44, and the ninth electrode E49.
  • the eighth electrode E48 is electrically connected to the second electrode E42, the eleventh electrode E51 of the first capacitor C41, and the ground electrode.
  • the ninth electrode E49 is electrically connected to the fourth electrode E44, the seventh electrode E47, and the thirteenth electrode E53, and functions as a gate. Therefore, in the third transistor Q43, the seventh electrode E47 and the ninth electrode E49 are electrically connected and set to the same potential.
  • the potential applied to the seventh electrode E47 increases, the potential difference between the eighth electrode E48 and the ninth electrode E49 with respect to the eighth electrode E48 becomes the threshold V th of the third transistor Q43. Beyond that, a conductive state in which current can flow between the drain and the source is established. Note that when the potential difference between the eighth electrode E48 and the ninth electrode E49 falls below the threshold value Vth , a non-conduction state is set in which no current can flow between the drain and the source.
  • the fourth transistor Q44 has twelfth to fourteenth electrodes E52 to E54.
  • the twelfth electrode E52 is electrically connected to a wiring (current supply line) Lct for supplying a current.
  • the thirteenth electrode E53 is electrically connected to the fourth electrode E44, the seventh electrode E47, and the ninth electrode E49.
  • the fourteenth electrode E54 is electrically connected to the scanning signal line L sl and functions as a gate.
  • the fourth transistor Q44 has a conductive state in which a current can flow between the drain and the source and a current incapable of flowing between the drain and the source due to the potential applied to the fourteenth electrode E54 that is a gate. It is selectively set to the conductive state.
  • the first capacitor C41 has a tenth electrode E50 and an eleventh electrode E51.
  • the tenth electrode E50 is electrically connected to the third electrode E43 and the fifth electrode E45, and the eleventh electrode E51 is connected to the second electrode E42, the eighth electrode E48, and the ground electrode. Yes.
  • the holding capacity of the first capacitor C41 is set to a predetermined value (for example, 1 pF).
  • a common current supply line for a plurality of pixel circuits 1C arranged in the column direction (vertical direction in FIG. 1).
  • Lct is electrically connected
  • a common scanning signal line L sl is electrically connected to the plurality of pixel circuits 1C arranged in the row direction (left-right direction in FIG. 1).
  • the X driver X d C supplies a current (hereinafter also referred to as “supply current”) I ct corresponding to the pixel data signal to the current supply line L ct in response to a signal from the control unit 111C.
  • the control unit 111C for example, outputs a signal for controlling the current supply timing corresponding to the pixel data signal from the X driver X d C to each current supply line L ct in synchronization with an image signal transmitted from the outside. Send to X driver X d C.
  • the dedicated driver S d C gives a potential to the scanning signal line L sl , the yield line L yd , and the connection point Pt 41 with a waveform corresponding to the control signal from the control unit 111C.
  • the dedicated driver S d C includes, for example, 41st to 43rd shift registers, and the scanning signal line L sl , the yield line L yd , and the connection point based on the data stored in the 41st to 43rd shift registers. It has a function of applying a potential to Pt41.
  • the 41st shift register holds data of the potential (power supply line potential) V41 applied to the connection point Pt41.
  • a constant high potential V41 for example, + 10V
  • the forty-second shift register holds data of a potential (scanning signal line potential) V sl applied to the scanning signal line L sl .
  • the scanning signal line potential abbreviated as “potential” as appropriate
  • V sl two values of a predetermined high potential V gH and a low potential V gL are appropriately employed.
  • the 43rd shift register holds data of the potential (yield line potential) V yd applied to the yield line L yd .
  • the yield line potential (abbreviated as “potential” as appropriate) V yd , a predetermined high potential V gH , a low potential V gL , and a medium potential V gM between the high potential V gH and the low potential V gL .
  • the potential applied to the sixth electrode E46 is set to a low potential V gL , a medium potential V gM , and a high potential V gH in a predetermined order for light emission of the organic EL element OLED corresponding to each frame. Is done. For example, when the high potential V gH is 1 and the low potential V gL is 0, the intermediate potential V gM is set to about 0.4.
  • the power supply line potential V41, the scanning signal line potential V sl , and the yield line potential V yd controlled by the 41st to 43rd shift registers respectively show waveforms corresponding to the control signal from the control unit 111C.
  • the drive waveform shown in FIG. 10 is repeated in time sequence by the number of times corresponding to the number of frames. Note that the drive waveform shown in FIG. 10 is realized under the control of the control unit 111C.
  • the horizontal axis indicates the time, from the top, (a) the supply current I ct, (b) the potential V sl of the scanning signal line L sl, (c) Yield line L yd potential V yd, the waveform It is shown.
  • a preparation period P p (time T21 to T23) in which light emission is not performed and preparation for adjusting the light emission luminance is performed, and a light emission period P e in which the organic EL element OLED actually emits light.
  • the light emission period Pe includes a high luminance period P e 1 in which the light emission luminance gradually increases from the initial period to the middle period and emits light at a relatively high luminance, and a luminance in which the light emission luminance gradually decreases from the middle period to the final period.
  • an attenuation period P e 2 is a high luminance period in which the light emission luminance gradually increases from the initial period to the middle period and emits light at a relatively high luminance, and a luminance in which the light emission luminance gradually decreases from the middle period to the final period.
  • the potential V yd of the yield line L yd is set from the middle potential V gM to the high potential V gH.
  • the supply current I ct supplied from the current supply line L ct is set to zero C 0 which is the first predetermined value
  • the potential V sl of the scanning signal line L sl is set to the low potential V gL .
  • the second transistor Q42 shifts from a conductive state in which a relatively small amount of current can flow to a conductive state in which a relatively large amount of current can flow.
  • the supply current I ct is set from zero C 0 to any value C d.
  • the arbitrary value Cd is a value corresponding to the pixel data signal and is equivalent to a current desired to flow through the first transistor Q41 and the organic EL element OLED.
  • the potential V sl of the scanning signal line L sl is set from the low potential V gL to the high potential V gH.
  • the fourth transistor Q44 is rendered conductive, the supply current I ct arbitrary value C d from the current supply line L ct is the seventh of the third transistor Q43 through the fourth transistor Q44 electrode E47 And applied to the ninth electrode E49.
  • the potential of the ninth electrode E49 that is, the gate voltage of the third transistor Q43 rises, and the seventh electrode E47 and the ninth electrode E49 of the third transistor Q43 pass between the seventh electrode E47 and the eighth electrode E48. It is set to the supply current I ct flows such potential arbitrary value C d.
  • the second transistor Q42 is conductive, and the same potential as that applied to the ninth electrode E49 is applied to the third electrode E43 of the first transistor Q41. That is, the gate voltage of the first transistor Q41 is raised, it is set to a voltage that flows a supply current I ct arbitrary value C d between the first electrode E41 and the second electrodes E42.
  • the current flowing between the anode electrode E a and the cathode electrode E c of the organic EL element OLED is increased, the supply current I ct equivalent of any value C d corresponding to the pixel data signal It reaches the value.
  • a light emission potential (light emission potential) according to an image signal is applied to the third electrode E43.
  • the process of setting the potential applied to the third electrode E43 to the light emission potential is performed by the current supply line Lct and the third transistor Q43.
  • the dedicated driver S d C controls the potentials applied to the scanning signal line L sl , the yield line L yd , and the connection point Pt 41, whereby the organic EL element OLED emits light.
  • the potential V yd of the yield line L yd is set from the high potential V gH to the low potential V gL.
  • the second transistor Q42 is set from a conductive state to a non-conducting state, the gate voltage of the first transistor Q41 is, the supply current I ct arbitrary value C d between the first electrode E41 and the second electrodes E42 Is maintained at such a voltage that current flows. That is, the potential applied to the third electrode E43 is held by the potential difference between the tenth electrode E50 and the eleventh electrode E51 of the first capacitor C41. From time T24 to T27, since the gate voltage of the first transistor Q41 is not changed, the organic EL element OLED emits light with peak luminance.
  • the potential V sl of the scanning signal line L sl is changed from the high potential V gH to the low potential V gL, the fourth transistor Q44 is set from a conductive state to a non-conductive state.
  • the current between the seventh electrode E47 and the eighth electrode E48 of the third transistor Q43 decreases and does not flow.
  • the supply current I ct is set to zero C 0 from any of the values C d.
  • the potential V yd of the yield line L yd is changed to the medium potential V gM from the low potential V gL.
  • the intermediate potential V gM is applied to the sixth electrode E46, the second transistor Q42 is in a conductive state in which a current can flow between the fourth electrode E44 and the fifth electrode E45 by an amount corresponding to the intermediate potential V gM. It becomes.
  • a potential corresponding to the pixel data signal held between the third electrode E43 and the tenth electrode E50 that is, an electric charge gradually flows to the third transistor Q43 via the second transistor Q42.
  • the potential applied to the seventh electrode E47 and the ninth electrode E49 increases, and the third transistor Q43 becomes conductive, and is held between the third electrode E43 and the tenth electrode E50.
  • the charged charge gradually escapes to the ground electrode through the third transistor Q43.
  • the gate voltage V gs of the first transistor Q41 decreases, and the first electrode E41 and the second electrode E42 of the first transistor Q41 The amount of current flowing between them gradually decreases, and the light emission luminance of the organic EL element OLED gradually attenuates.
  • the potential V yd of the yield line L yd becomes the high potential V gH at time T21 related to the next light emission
  • the potential of the third electrode E43 is changed between the first electrode E41 and the second electrode E42. The potential cannot flow, and the light emission period Pe ends.
  • the temporal change pattern of the light emission luminance of the organic EL element OLED is the same as the pattern according to the first and second embodiments shown in FIG. 4, and the high luminance period P e 1 and the luminance attenuation period. P e 2 and the light emission period P e configured with a can be realized. Further, the attenuation of the gate voltage V gs of the first transistor Q41 in the luminance attenuation period P e 2 satisfies the relationship expressed by the above equation (1) as in the first and second embodiments.
  • control unit 111C changes the potential applied to the sixth electrode E46 from the low potential V gL to the medium potential V gM , thereby switching from the high luminance period P e 1 to the luminance decay period P e 2. It is done.
  • control unit 111C a plurality of pixel circuits 1C arranged in the display panel 121C, substantially been luminescence started simultaneously, substantially luminance decay from the high luminance period P e 1 simultaneously The period is switched to P e 2. That is, the emission luminance starts to attenuate at the same timing in the entire screen, and the emission luminance gradually attenuates toward zero.
  • the pixel circuit has been conventionally used to realize a relatively low emission luminance (dark emission).
  • the amount of current supplied to the transistor becomes small, there is a problem that it takes a long time to accurately set the current flowing through the first transistor Q1 to a desired current. Therefore, it is difficult to accurately adjust the light emission luminance in consideration of the time interval between frames constituting a moving image.
  • the current flowing through the organic EL element OLED during the light emission period P e is attenuated gradually. Therefore, as compared with the case where the current flowing through the organic EL element OLED immediately reduced, equivalent to one light emission period P e emission in the entire luminance (value obtained by time integration of the light emission luminance of the light emission period P e) In order to obtain a correct value, it is necessary to increase the peak luminance. Therefore, the value of the supply current I ct when adjusting the current flowing through the organic EL element OLED is relatively high, and the amount of current when the light emission luminance is relatively low (dark light emission) is accurately adjusted. It becomes possible.
  • the dark part in the moving image is accurately described, and the image quality is improved.
  • the value of the intermediate potential V gM and appropriately setting the duty, it is possible to appropriately improve the image quality. For example, it is possible to display a moving image that does not feel awkward due to the presence of emission luminance attenuation.
  • the image display device 100D according to the fourth embodiment of the present invention can set the light emission luminance of the organic EL element OLED by appropriately setting the amount of current supplied to the pixel circuit. This is an image display device of a method to be adjusted. However, in the image display device 100D according to the fourth embodiment, the pixel circuit 1C is changed to a pixel circuit 1D having a different configuration compared to the image display device 100C according to the third embodiment.
  • the image display device 100D according to the fourth embodiment is substantially the same in overall configuration as the image display device 100C according to the third embodiment, but the pixel circuit 1C is changed to the pixel circuit 1D, and the display panel 121C. Is a display panel 121D in which a plurality of pixel circuits 1D are arranged.
  • the same parts as those of the image display device 100C according to the third embodiment will be denoted by the same reference numerals, and description thereof will be omitted.
  • a pixel circuit 1D according to the fourth embodiment of FIG. 11 includes an organic EL element OLED, first to fourth transistors Q61 to Q64, and a first capacitor C61.
  • the anode electrode of the organic EL element OLED E a is conductively connected to the connection point Pt61 the power supply line for imparting positive potential during light emission of the organic EL element OLED.
  • the cathode electrode E c of the organic EL element OLED is electrically connected to the grounded electrode (ground electrode) via the first transistor Q61.
  • the first to fourth transistors Q61 to Q64 are configured by n-MISFET TFTs similarly to the first to fourth transistors Q1 to Q4, Q21 to Q24, and Q41 to Q44 according to the first to third embodiments.
  • the first transistor Q61 has first to third electrodes E61 to E63.
  • the first electrode E61 is electrically connected to the cathode electrode E c
  • the second electrode E62 is, the eighth electrode E68 of the ground electrode and the third transistor Q63 and the eleventh electrode E71 of the first capacitor C1 to Are electrically connected.
  • the organic EL element OLED emits light, that is, when a forward current flows through the organic EL element OLED
  • the first electrode E61 functions as a drain and the second electrode E62 functions as a source.
  • the third electrode E63 functions as a gate and is electrically connected to the fifth electrode E65 of the second transistor Q62, the tenth electrode E70 of the first capacitor C61, and the ninth electrode E69 of the third transistor Q63.
  • the potential applied to the third electrode E63 that is a gate specifically, the voltage between the gate and the source, that is, between the first electrode E61 and the second electrode E62, that is, the drain and the The current to and from the source is adjusted. Then, along with the adjustment of the current amount between the drain and the source, the current amount and the light emission luminance in the organic EL element OLED are controlled.
  • the first transistor Q61 has a non-conductive state in which a current can flow between the drain and the source and a current that cannot flow between the drain and the source due to the potential applied to the third electrode E63 that is a gate. It is selectively set to the conductive state.
  • the first transistor Q61 has a lower limit of a gate voltage (specifically, a potential difference between the second electrode E62 and the third electrode E63 with respect to the potential of the second electrode E62) in a conductive state.
  • the value (threshold voltage of the first transistor Q61) V th exists.
  • the second transistor Q62 has fourth to sixth electrodes E64 to E66.
  • the fourth electrode E64 is electrically connected to the seventh electrode E67 of the third transistor Q63 and the thirteenth electrode E73 (that is, a current supply source) of the fourth transistor Q64.
  • the fifth electrode E65 is electrically connected to the third electrode E63, the tenth electrode E70 of the first capacitor C61, and the ninth electrode E69 of the third transistor Q63.
  • the sixth electrode E66 is electrically connected to the yield line L yd and functions as a gate.
  • the potential between the fourth electrode E64 and the fifth electrode E65 i.e., the drain, is determined by the potential applied to the sixth electrode E66 that is the gate, specifically, the voltage between the gate and the source. The current to and from the source is adjusted.
  • the fifth electrode E65 is electrically connected to the third electrode E63, and the potential applied to the sixth electrode E66 is changed, whereby the fourth electrode E64 and the fifth electrode E65 are changed.
  • the current between is adjusted.
  • the charge applied to the third electrode E63 of the first transistor Q61 is released to the ground electrode through the second transistor Q62 and the third transistor Q63, whereby the gate voltage of the first transistor Q61 is adjusted.
  • the second transistor Q62 may perform a function necessary for extracting the charge of the third electrode E63 of the first transistor Q61 to the ground electrode. Therefore, if the capacitance is proportional to the size of the transistor, for example, it may have a structural size of about 1/10 of the first transistor Q61 through which a large current for light emission flows.
  • the third transistor Q63 has seventh to ninth electrodes E67 to E69.
  • the seventh electrode E67 is electrically connected to the fourth electrode E64 and the thirteenth electrode E73 (that is, a current supply source) of the fourth transistor Q64.
  • the eighth electrode E68 is electrically connected to the second electrode E62, the eleventh electrode E71 of the first capacitor C61, and the ground electrode.
  • the ninth electrode E69 is electrically connected to the third electrode E63, the fifth electrode E65, and the tenth electrode E70 of the first capacitor C1, and functions as a gate.
  • the current applied between the seventh electrode E67 and the eighth electrode E68 is adjusted by changing the potential applied to the ninth electrode E69.
  • the seventh electrode E67 and the ninth electrode E69 are electrically connected through the second transistor Q62. Therefore, for example, when the second transistor Q62 is in a conducting state, the seventh electrode E67 and the ninth electrode E69 are short-circuited to have the same potential. At this time, if the potentials of the seventh electrode E67 and the ninth electrode E69 rise, the potential difference between the eighth electrode E68 and the ninth electrode E69 with respect to the eighth electrode E68 becomes the threshold V of the third transistor Q63. Beyond th , a conductive state in which current can flow between the drain and the source is established. Note that when the potential difference between the eighth electrode E68 and the ninth electrode E69 is lower than the threshold value Vth , a non-conductive state in which no current can flow between the drain and the source is set.
  • the fourth transistor Q64 has twelfth to fourteenth electrodes E72 to E74.
  • the twelfth electrode E72 is electrically connected to a wiring (current supply line) Lct for supplying a current.
  • the thirteenth electrode E73 is electrically connected to the fourth electrode E64 and the seventh electrode E67.
  • the fourteenth electrode E74 is electrically connected to the scanning signal line L sl and functions as a gate. Therefore, the fourth transistor Q64 has a non-conductive state in which a current can flow between the drain and the source and a current that cannot flow between the drain and the source due to the potential applied to the fourteenth electrode E74 that is a gate. It is selectively set to the conductive state. In the case of the fourth transistor Q64 is conductive, thirteenth electrode E73 functions as a supply source for supplying the current from the current supply line L ct to the second and third transistors Q62, Q63.
  • the first capacitor C61 has a tenth electrode E70 and an eleventh electrode E71.
  • the tenth electrode E70 is electrically connected to the third electrode E63, the fifth electrode E65, and the ninth electrode E69, and the eleventh electrode E71 includes the second electrode E62, the eighth electrode E68, and the ground electrode. Are electrically connected.
  • the holding capacity of the first capacitor C61 is set to a predetermined value (for example, 1 pF).
  • the timing chart showing the signal waveform (driving waveform) when the organic EL element OLED emits light in the image display device 100D is the same as the timing chart according to the third embodiment shown in FIG.
  • the pixel circuit 1D according to the fourth embodiment and the pixel circuit 1C according to the third embodiment have different configurations, the flow of charge and current in the pixel circuit 1D is different from that of the pixel circuit 1C.
  • the drive waveform shown in FIG. 10 is repeated in time sequence by the number of times corresponding to the number of frames.
  • the potential V yd of the yield line L yd is set from the middle potential V gM to the high potential V gH.
  • the supply current I ct supplied from the current supply line L ct is set to zero C 0 which is the first predetermined value
  • the potential V sl of the scanning signal line L sl is set to the low potential V gL .
  • the second transistor Q62 shifts from a conductive state in which a relatively small amount of current can flow to a conductive state in which a relatively large amount of current can flow.
  • the supply current I ct is set to an arbitrary value C d corresponding to the pixel data signal from zero C 0 , that is, a value equivalent to a current desired to flow through the first transistor Q61 and the organic EL element OLED. Is done.
  • the potential V sl of the scanning signal line L sl is set from the low potential V gL to the high potential V gH.
  • the fourth transistor Q64 becomes conductive, and the supply current I ct having an arbitrary value C d from the current supply line L ct passes through the fourth transistor Q64 to the seventh electrode E67 of the third transistor Q63.
  • the ninth electrode E69 via the second transistor Q62.
  • the potential of the ninth electrode E69 that is, the gate voltage of the third transistor Q63 rises, and the seventh electrode E67 and the ninth electrode E69 of the third transistor Q63 pass between the seventh electrode E67 and the eighth electrode E68. It is set to the supply current I ct flows such potential for any value C d.
  • the ninth electrode E49 and the third electrode E63 are directly electrically connected, the same potential as that of the ninth electrode E69 is applied to the third electrode E63. That is, at time T23 ⁇ T24, the gate voltage of the first transistor Q61 is increased, is set to a voltage flowing supply current I ct arbitrary value C d between the first electrode E61 and the second electrodes E62 The Thus, at time T23 ⁇ T24, the current flowing between the anode electrode E a and the cathode electrode E c of the organic EL element OLED is increased, the supply current I ct equivalent of any value C d corresponding to the pixel data signal It reaches the value.
  • a light emission potential (light emission potential) corresponding to an image signal (specifically, a pixel data signal) is applied to the third electrode E63.
  • the process of setting the potential applied to the third electrode E63 to the light emission potential is performed by the current supply line Lct and the third transistor Q63.
  • the dedicated driver S d C controls the potentials applied to the scanning signal line L sl , the yield line L yd , and the connection point Pt 61, whereby the organic EL element OLED emits light.
  • the potential V yd of the yield line L yd is set from the high potential V gH to the low potential V gL.
  • the second transistor Q62 is set from a conductive state to a non-conducting state, the gate voltage of first transistor Q61 is, the supply current I ct arbitrary value C d between the first electrode E61 and the second electrodes E62 Is maintained at such a voltage that current flows.
  • the potential applied to the third electrode E63 is held by the potential difference between the tenth electrode E70 and the eleventh electrode E71 of the first capacitor C61.
  • the organic EL element OLED emits light with peak luminance.
  • the potential of the ninth electrode E69 is substantially the same as the potential of the third electrode E63, the third transistor Q63 is in a conductive state.
  • the potential V sl of the scanning signal line L sl is changed from the high potential V gH to the low potential V gL, the fourth transistor Q64 is set from a conductive state to a non-conductive state. At this time, the supply of current to the third transistor Q63 is also stopped, and the current between the seventh electrode E67 and the eighth electrode E68 decreases and does not flow.
  • the supply current I ct is set to zero C 0 from any of the values C d.
  • the potential V yd of the yield line L yd is changed to the medium potential V gM from the low potential V gL.
  • the intermediate potential V gM is applied to the sixth electrode E66, the second transistor Q62 is in a conductive state in which current can flow between the fourth electrode E64 and the fifth electrode E65 by an amount corresponding to the intermediate potential V gM. It becomes. Then, a potential corresponding to the pixel data signal held between the third electrode E63, the tenth electrode E70, and the ninth electrode E69, that is, an electric charge flows to the third transistor Q63 via the second transistor Q62. .
  • the third transistor Q63 since the third transistor Q63 is in a conductive state, the charge held between the third electrode E63, the tenth electrode E70, and the ninth electrode E69 passes through the second transistor Q62 and the third transistor Q63. And gradually come out to the ground electrode.
  • the gate voltage V gs of the first transistor Q61 decreases and the first electrode E61 and the second electrode E62 of the first transistor Q61 The amount of current flowing between them gradually decreases, and the light emission luminance of the organic EL element OLED gradually attenuates.
  • the potential V yd of the yield line L yd becomes the high potential V gH at time T21 related to the next light emission
  • the potential of the third electrode E63 is changed between the first electrode E61 and the second electrode E62. The potential cannot flow, and the light emission period Pe ends.
  • the temporal change pattern of the light emission luminance of the organic EL element OLED is the same as the pattern according to the first to third embodiments shown in FIG. 4, and the high luminance period P e 1 and the luminance attenuation period P The light emission period P e configured with e 2 is realized. Further, the attenuation of the gate voltage V gs of the first transistor Q61 in the luminance attenuation period P e 2 satisfies the relationship expressed by the above equation (1) as in the first to third embodiments.
  • control unit 111C changes the potential applied to the sixth electrode E66 from the low potential V gL to the medium potential V gM , thereby switching from the high luminance period P e 1 to the luminance decay period P e 2. It is done.
  • control unit 111C starts light emission substantially simultaneously in the plurality of pixel circuits 1D arranged on the display panel 121D, and substantially simultaneously starts from the high luminance period Pe1 to the luminance decay period. switches to P e 2. That is, the emission luminance starts to attenuate at the same timing in the entire screen, and the emission luminance gradually attenuates toward zero.
  • the third electrode E43 and the tenth electrode E50 When the potential V yd is changed from the low potential V gL to the medium potential V gM at time T27, the third electrode E43 and the tenth electrode E50 The potential corresponding to the pixel data signal held in between, that is, the electric charge, gradually flows to the third transistor Q43 via the second transistor Q42. Then, after the potential applied to the seventh electrode E47 and the ninth electrode E49 increases, the third transistor Q43 becomes conductive, and the charge held between the third electrode E43 and the tenth electrode E50 is reduced. Then, it gradually goes out to the ground electrode through the third transistor Q43. Accordingly, the potential V yd of the yield line L yd, after changing the medium potential V gM from the low potential V gL, actually is a slight delay before the emission luminance of the organic EL element OLED begins to decay occurs.
  • the third transistor Q63 since the third electrode E63 and the ninth electrode E69 are directly electrically connected, the third transistor Q63 is not connected before the time T27. It is in a conductive state. Accordingly, the potential V yd of the yield line L yd, by changing the medium potential V gM from the low potential V gL, emission luminance of the organic EL element OLED begins to decay immediately. That is, the luminance decay period P e2 is quickly started in response to the change in the gate potential of the second transistor Q62. Thus, in the image display device 100D according to the fourth embodiment, the responsiveness of the emission luminance attenuation to the change in the potential V yd of the yield line L yd is good.
  • the size of the second transistors Q42 and Q62 be the minimum necessary size.
  • the second transistor Q42 exists between the ninth electrode E49 that is the gate of the third transistor Q43 and the third electrode E43 that is the gate of the first transistor Q41. Yes. If the second transistor Q42 is small, a certain amount of time is required until the potential of the ninth electrode E49 is reflected in the potential of the third electrode E43.
  • the ninth electrode E69 and the third electrode E63 are directly electrically connected. For this reason, the potential of the ninth electrode E69 is immediately reflected in the potential of the third electrode E63, and the time from the start of light emission of the organic EL element OLED to the peak luminance is shortened.
  • n-type transistors are used as the first to fourth transistors Q1 to Q4, Q21 to Q24, Q41 to Q44, and Q61 to Q64.
  • the pixel circuit may be configured using p-type transistors. In order to realize a pixel circuit using a p-type transistor, for example, the connection mode and the potential setting of the organic EL element OLED may be reversed.
  • the image display device using the organic EL element is described as an example.
  • the application target of the present invention is not limited to this.
  • an EL element made of an inorganic material emits light depending on the amount of current.
  • the present invention may be applied to general image display devices in which light emitting elements of a type whose luminance is adjusted (current control type) are arranged.
  • the gate voltage V gs is lowered by the second transistors Q2, Q22, Q42, and Q62 during the light emission period of each frame, so that the organic EL element OLED receives the pixel data signal.
  • the high luminance period P e 1 which emits light at a predetermined peak luminance corresponding to, but emission luminance of the organic EL element OLED is switched to the luminance decay time P e 2 which decays from the peak brightness is not limited thereto .
  • the power is supplied by a dedicated driver during the light emission period of each frame.
  • the potential difference applied between the anode electrode and the second electrode is changed to a different potential difference, so that the high luminance period P e 1 is changed to the luminance decay period P e. It may be switched to 2.
  • the luminance decay time of high luminance period P e 1 it may be switched to the P e 2.
  • Image display device is different from the image display device 100A according to the first embodiment in that the display panel 121A including the pixel circuit 1A is different from the display panel 121E including the pixel circuit 1E having a different configuration.
  • the dedicated driver S d A is changed to a dedicated driver S d E having a different function, and the control unit 111A is changed to a control unit 111E that performs different control.
  • the image display device 100E according to the first modification has the same configuration as the image display device 100A according to the first embodiment.
  • the same components as those of the image display device 100A according to the first embodiment are denoted by the same reference numerals and description thereof is omitted.
  • the pixel circuit 1E includes an organic EL element OLED, a first transistor Q81, a second transistor Q82, and a capacitor C81.
  • the anode electrode E a of the organic EL element OLED is electrically connected to the V DD line L vd as a power supply line which is a high potential side during light emission of the organic EL element OLED among the feed line.
  • the cathode electrode E c is electrically connected via the first transistor Q81 to the V SS line L vs as a power supply line which is on the low potential side when the organic EL element OLED emits light among the power supply lines.
  • the organic EL element OLED functions as a capacitor when a voltage opposite to that during light emission is applied.
  • the first transistor Q81 is a transistor that is electrically connected in series to the organic EL element OLED and controls the light emission luminance of the organic EL element OLED by adjusting the amount of current in the organic EL element OLED.
  • the first transistor Q81 is configured by an n-MISFET TFT, like the first transistor Q1 according to the first embodiment.
  • the first transistor Q81 has first to third electrodes E81 to E83.
  • the first electrode E81 is electrically connected to the cathode electrode E c of the organic EL element OLED, when the light emitting organic EL element OLED, that is, the drain when the flows forward current to the organic EL element OLED Function as.
  • the second electrode E82 is electrically connected to the V SS line L vs and functions as a source when a forward current flows through the organic EL element OLED.
  • a current flows in the reverse direction with respect to the organic EL element OLED it functions as a drain.
  • the third electrode E83 is a so-called gate and is electrically connected to one electrode (seventh electrode E87) of the capacitor C81.
  • a potential applied to the third electrode E83 more specifically, applied between the first electrode E81 or the second electrode E82 and the third electrode E83 (ie, between the gate and the source).
  • the voltage value to be adjusted the amount of current (current amount) flowing between the first electrode E81 and the second electrode E82 is adjusted.
  • the potential applied to the third electrode E83 causes the first transistor Q81 to have a state in which current can flow between the drain and the source (conductive state) and a state in which current cannot flow (non-conductive state). Selectively set.
  • the second transistor Q82 detects the lower limit (threshold value V th ) of the potential of the third electrode E83 with respect to the second electrode E82 of the first transistor Q81 when the first transistor Q81 is energized, and the first transistor This is a transistor for adjusting the gate voltage of Q81 to the threshold value Vth .
  • the second transistor Q82 is also formed of an n-MISFET TFT, like the first transistor Q81.
  • the second transistor Q82 has fourth to sixth electrodes E84 to E86.
  • the fourth electrode E84 is connected conductively with respect the cathode electrode E c of the first electrode E81 and the organic EL element OLED of the first transistor Q81.
  • the fifth electrode E85 is conductively connected to the third electrode (gate) E83 of the first transistor Q81 and the capacitor C81 via the connection point T1.
  • the sixth electrode E86 is a so-called gate and is electrically connected to the scanning signal line L ss .
  • the potential applied to the sixth electrode E86 more specifically, between the fourth electrode E84 or the fifth electrode E85 and the sixth electrode E86 (that is, between the gate and the source).
  • the amount of current (current amount) flowing between the fourth electrode E84 and the fifth electrode E85 is adjusted by adjusting the applied voltage value.
  • the second transistor Q82 has a state in which a current can flow between the drain and the source (conductive state) and a state in which a current cannot flow (non-conductive state). Selectively set.
  • the second transistor Q82 has a function of compensating for variations in the threshold Vth in the first transistor Q81 by adjusting the gate voltage of the first transistor Q81 to the threshold V th for each pixel before light emission (V th compensation function). ).
  • Capacitor C81 is provided with a seventh electrode E87 is electrically connected to the third electrode E83 of the first transistor Q81, and an eighth electrode E88 is electrically connected to the image signal line L IS.
  • the drive waveform shown in FIG. 13 is repeated time-sequentially by the number of times corresponding to the number of frames.
  • the drive waveform shown in FIG. 13 is realized under the control of the control unit 111E.
  • the horizontal axis indicates time, and in order from the top, (a) the potential applied to the V DD line L vd (potential V dd ), (b) the potential applied to the V SS line L vs (potential V ss ), (c) the potential of the signal applied to the first scanning signal line L ss (potential V ls 1), (d) the potential of the signal applied to the second scanning signal line L ss (potential V ls 2). (E) The waveform of the potential (potential V lis ) of the signal applied to the image signal line Lis is shown.
  • a preparation period P p (time T31 to T36) in which light emission is not performed and preparation for adjusting the light emission luminance is performed, and a light emission period P e in which the organic EL element OLED actually emits light.
  • the light emission period Pe includes a period in which the luminance gradually increases from the initial stage to the middle stage and light is emitted at a relatively high brightness (high brightness period) P e 1 (time T36 to T37), and light emission brightness gradually from the middle stage to the final stage.
  • There and a period during which decays (luminance decay time) P e 2 (time T37 ⁇ T38).
  • the potential V dd of the V DD line L vd is set to the high potential V DD .
  • the potential V ss of the V SS line L vs is set to the high potential V DD
  • the potential V ls N applied to all the scanning signal lines L ss is set to the high potential V gH
  • the image signal line L is The potential V lis of the signal applied to is set to the reference potential GND.
  • the second transistor Q82 is in a conducting state
  • the first transistor Q81 is substantially in a non-conducting state with respect to the first transistor Q81 because the V DD line L vd and the V SS line L vs have substantially the same potential. (OFF state).
  • a current flows from the V DD line L vd to the capacitor C81 via the second transistor Q82, and a predetermined amount of charge is accumulated in the capacitor C81.
  • the potential V dd of the V DD line L vd is set to a predetermined negative potential ⁇ V p . Further, the potential V ss of the V SS line L vs is set to the reference potential GND, the potential V ls N applied to all the scanning signal lines L ss is set to the low potential V gL , and the image signal line L is The potential V lis of the applied signal is set to the positive potential V dH . At this time, the second transistor Q82 is turned off.
  • the first transistor Q81 the application of a positive potential V dH in the image signal line L IS, positive potential corresponding to the positive potential V dH to the third electrode (gate) E83 is applied, becomes conductive. Since towards V SS line L vs high potential by V p than V DD line L vd, through the first transistor Q81 from V SS line L vs, current flows to the organic EL element OLED. As a result, a predetermined amount of charge corresponding to the potential difference between the V DD line L vd and the V SS line L vs is accumulated in the organic EL element OLED.
  • the potential V dd of the V DD line L vd is set to the reference potential GND. Further, the potential V ss of the V SS line L vs is maintained at the reference potential GND, the potential V ls N applied to all the scanning signal lines L ss is set to the high potential V gH , and the image signal line L is The potential V lis of the applied signal is maintained at the positive potential V dH .
  • the second transistor Q82 becomes conductive.
  • the positive potential V dH applied to charge the image signal line L IS accumulated in the capacitor C81, in a conductive state for the first transistor Q81, the initial time T33 ⁇ T34, the positive potential V dH applied to charge the image signal line L IS accumulated in the capacitor C81, in a conductive state.
  • a current accompanying the charge accumulated in the capacitor C81 flows from the capacitor C81 toward the V SS line L vs via the second transistor Q82 and the first transistor Q81 sequentially.
  • a current accompanying the charge accumulated in the organic EL element OLED flows toward the V SS line L vs via the first transistor Q81.
  • the charge accumulated in the capacitor C81 decreases. For this reason, when the potential (gate voltage) V gs of the third electrode E83 with respect to the second electrode E82 of the first transistor Q81 substantially decreases to the threshold value V th , the first transistor Q81 becomes non-conductive.
  • the capacitor C81 is in a state where electric charges according to the threshold value Vth are accumulated. Accordingly, from time T33 to T34, electric charge corresponding to the threshold value Vth is accumulated in the capacitor C81, and variations in the threshold value Vth that are different for each pixel are compensated.
  • a reference potential GND is applied to the V DD line L vd and the V SS line L vs , respectively, and a process of storing charges according to the pixel data signal (data writing process) is performed.
  • the high potential V gH is applied to the scanning signal line L ss and the potential (V dH ⁇ V data ) is applied to the image signal line L is .
  • the potential V data is a potential of the pixel data signal, and is a potential corresponding to a value corresponding to the luminance gradation of the pixels constituting the image.
  • the second transistor Q82 is rendered conductive by applying the high potential V gH to the gate through the scanning signal line L ss .
  • the first transistor Q81 the image signal line L IS
  • V dH -V data is a positive potential V dH following potential (V dH -V data) is applied at time T33 ⁇ T34
  • the gate voltage becomes less than the threshold value V th Therefore, it becomes a non-conduction state.
  • a current flows from the organic EL element OLED to the capacitor C81 via the second transistor Q82.
  • the charge corresponding to the potential V data is added and stored on the charge corresponding to the threshold value V th already stored in the capacitor C81.
  • a predetermined negative potential ⁇ V p is applied to the V DD line L vd and the V SS line L vs , respectively, and a low potential V gL is applied to all the scanning signal lines L ss , thereby generating an image signal.
  • positive potential V dH is applied to the line L is.
  • the second transistor Q82 is turned off and the first transistor Q81 is turned on.
  • the charge accumulated in the organic EL element OLED is The charge accumulated in the organic EL element OLED is wiped out through the V SS line L vs.
  • the positive high potential V DD is applied to the V DD line L vd
  • the reference potential GND is applied to the V SS line L vs and the scanning signal line L ss is low.
  • potential V gL is applied
  • a positive potential V dH is applied to the image signal line L iS.
  • the second transistor Q82 is turned off.
  • the first transistor Q81 since the positive potential V dH is applied to the image signal line L IS, the amount of charge stored in the capacitor C81 at the time T35 ⁇ T36 (the amount of charge corresponding to the potential V data) Accordingly, the gate voltage V gs of the first transistor Q81 becomes higher than the threshold value V th by the potential corresponding to, and the conductive state is established. Then, the V DD line L vd is higher than the V SS line L vs by the potential V DD , and the first transistor Q81 enters a conductive state in which a current corresponding to the potential V data flows. For this reason, a current corresponding to the potential V data flows through the organic EL element OLED.
  • the organic EL element OLED emits light with a luminance corresponding to the potential V data .
  • the dedicated driver S d E controls the potential applied to the V DD line L vd and the V SS line L vs so that the potential of the third electrode E83 is set to the light emission potential, and the anode electrode E a and a predetermined potential difference between the second electrode E82 is applied, the organic EL element OLED emits light.
  • Image display device In the image display device 100F according to the second modification, the control unit 111E is changed to a control unit 111F that performs different control compared to the image display device 100E according to the first modification. Regarding other configurations, the image display device 100F according to the second modification has the same configuration as the image display device 100E according to the first modification.
  • the same components as those of the image display device 100E according to the first modification are denoted by the same reference numerals and description thereof is omitted.
  • the drive waveform shown in FIG. 14 is repeated time by time according to the number of frames.
  • the drive waveform shown in FIG. 14 is realized under the control of the control unit 111F.
  • the drive waveforms after time T37 are different from those in the timing chart (FIG. 13) according to the first modification. Therefore, here, a drive waveform after time T37 will be described.
  • the potential V dd of the V DD line L vd is maintained at the high potential V DD by the X driver X d A under the control of the control unit 111F, and the image signal line L is as time elapses.
  • the potential V lis of the signal applied to is lowered so as to gradually approach the reference potential GND from the positive potential V dH .
  • the potential applied to the third electrode E83 gradually decreases, the amount of current flowing between the first electrode E81 and the second electrode E82 of the first transistor Q81 gradually decreases, and the organic EL The light emission luminance of the element OLED gradually attenuates.
  • the potential V dd of the V DD line L vd is changed to a different potential by the dedicated driver S d E in the middle of the light emission period of each frame, and at the same time by the X driver X d A
  • the high luminance period P e 1 may be switched to the luminance decay period P e 2.
  • the present invention is a capacitor that holds a voltage corresponding to a pixel data signal, a change in the voltage of the power line (power voltage), a change in the voltage of the image signal line (data voltage), during the light emission period.
  • the light emission luminance is slowly and gradually attenuated in a light emitting element that emits light quickly in response to voltage application, and the light is turned off.
  • a method of gradually attenuating the light emission luminance naturally by stopping the application of voltage to the light emitting element of the material of the light emitting element constituting the display panel can be considered.
  • a material of a light emitting element that emits light of each color (for example, red, green, blue, etc.) constituting the display panel is a material whose emission luminance is naturally attenuated in response to the stop of voltage application to the light emitting element.
  • the lighting and extinguishing characteristics of the light emitting elements of the respective colors are different. For this reason, when the light emission luminance of the light emitting element is naturally attenuated under such conditions, the speed of turning off the light emitting elements of the respective colors becomes uneven, resulting in a deterioration in image quality.
  • the emission luminance attenuation curve of the light emitting element can be set to a desired curve regardless of the characteristics of lighting and extinguishing of the light emitting elements of each color. For example, it is possible to adjust the light emitting material that tends to be turned off quickly by increasing the time required for turning off the light, and for the light emitting material that tends to turn off slowly, the time required for turning off the light can be reduced. Therefore, according to the present invention, since the speed of turning off the light emitting elements of the respective colors is uniform, it is possible to reproduce a high-quality moving image that makes the human eye feel clear and bright while suppressing deterioration of the panel. Become.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)
  • Electroluminescent Light Sources (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

L'invention porte sur une technologie d'affichage d'image pour reproduire une image en mouvement de haute qualité qui est claire et lumineuse aux yeux humains, tout en supprimant une détérioration de panneau. L'invention porte également sur un dispositif d'affichage d'image, qui comporte un élément émetteur de lumière dans lequel une luminance d'émission de lumière est réglée par un courant qui circule ; et une section de commande pour effectuer une commutation entre une période de luminance élevée, dans laquelle l'élément émetteur de lumière émet de la lumière à une première luminance, et une période d'atténuation de luminance dans laquelle la luminance d'émission de lumière de l'élément émetteur de lumière est atténuée de la première luminance à une deuxième luminance. Dans le dispositif d'affichage d'image, une période de temps entre un temps où l'élément émetteur de lumière commence à émettre de la lumière et un temps où la luminance d'émission de lumière de l'élément émetteur de lumière atteint la première luminance est plus courte que la période de temps où la luminance d'émission de lumière s'atténue de la première luminance à la deuxième luminance dans la période d'atténuation de luminance.
PCT/JP2009/052171 2008-02-20 2009-02-09 Dispositif d'affichage d'image Ceased WO2009104492A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2009554274A JP4989734B2 (ja) 2008-02-20 2009-02-09 画像表示装置
TW098105336A TWI425475B (zh) 2008-02-20 2009-02-19 圖像顯示裝置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008-038856 2008-02-20
JP2008038856 2008-02-20

Publications (1)

Publication Number Publication Date
WO2009104492A1 true WO2009104492A1 (fr) 2009-08-27

Family

ID=40985375

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2009/052171 Ceased WO2009104492A1 (fr) 2008-02-20 2009-02-09 Dispositif d'affichage d'image

Country Status (3)

Country Link
JP (1) JP4989734B2 (fr)
TW (1) TWI425475B (fr)
WO (1) WO2009104492A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012053447A (ja) * 2010-08-06 2012-03-15 Canon Inc 表示装置及びその駆動方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000348860A (ja) * 1999-06-04 2000-12-15 Canon Inc 発光装置
JP2002328651A (ja) * 2001-04-27 2002-11-15 Pioneer Electronic Corp 発光パネルの駆動方法及び駆動装置
JP2007108380A (ja) * 2005-10-13 2007-04-26 Sony Corp 表示装置および表示装置の駆動方法
JP2007283599A (ja) * 2006-04-14 2007-11-01 Matsushita Electric Ind Co Ltd 発光素子駆動装置及びそれを用いた画像形成装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7382339B2 (en) * 2002-05-16 2008-06-03 Koninklijke Philips Electronics N. V. LED capacitance discharge with limited current
EP2267691B1 (fr) * 2005-05-24 2014-02-12 Casio Computer Co., Ltd. Appareil d'affichage et sa méthode de commande

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000348860A (ja) * 1999-06-04 2000-12-15 Canon Inc 発光装置
JP2002328651A (ja) * 2001-04-27 2002-11-15 Pioneer Electronic Corp 発光パネルの駆動方法及び駆動装置
JP2007108380A (ja) * 2005-10-13 2007-04-26 Sony Corp 表示装置および表示装置の駆動方法
JP2007283599A (ja) * 2006-04-14 2007-11-01 Matsushita Electric Ind Co Ltd 発光素子駆動装置及びそれを用いた画像形成装置

Also Published As

Publication number Publication date
TW200951917A (en) 2009-12-16
JPWO2009104492A1 (ja) 2011-06-23
JP4989734B2 (ja) 2012-08-01
TWI425475B (zh) 2014-02-01

Similar Documents

Publication Publication Date Title
JP5560206B2 (ja) 有機ｅｌ表示装置及びその制御方法
US6738034B2 (en) Picture image display device and method of driving the same
JP6142178B2 (ja) 表示装置および駆動方法
US8358297B2 (en) Display apparatus and display-apparatus driving method
KR102270613B1 (ko) 유기발광다이오드 표시장치
US8344975B2 (en) EL display device with voltage variation reduction transistor
CN102428508B (zh) 图像显示装置及其驱动方法
US9236001B2 (en) Method of driving electro-optic device and electro-optic device in which light emitting elements emit light concurrently in a period during one frame
EP1439520A2 (fr) Dispositif d'affichage à matrice active
US11176885B2 (en) Display device, method for driving display device, and electronic device
JP5565098B2 (ja) 電気光学装置および電子機器
CN107123400B (zh) 显示装置和显示装置的驱动方法
JP2012237806A (ja) 表示装置及び電子機器
WO2013021417A1 (fr) Dispositif d'affichage
WO2014034072A2 (fr) Dispositif d'affichage et appareil électronique
KR20090118225A (ko) 표시 장치 및 그 구동 방법
JP2020085959A (ja) 画素回路、表示装置、画素回路の駆動方法および電子機器
JP7090412B2 (ja) 画素回路、表示装置、画素回路の駆動方法および電子機器
US20040263503A1 (en) Drive devices and drive methods for light emitting display panel
JP5152094B2 (ja) 画素回路及び画素回路の駆動方法、並びに、表示装置及び表示装置の駆動方法
JP5565097B2 (ja) 電気光学装置および電子機器
JP2012058634A (ja) 表示装置、表示装置の駆動方法、及び、電子機器
TW201030705A (en) Image display apparatus and method of driving the image display apparatus
JP4989734B2 (ja) 画像表示装置
US20060103606A1 (en) Organic electroluminescence display device

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 09712721

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2009554274

Country of ref document: JP

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 09712721

Country of ref document: EP

Kind code of ref document: A1