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WO2014097400A1 - Appareil électroluminescent - Google Patents

Appareil électroluminescent Download PDF

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Publication number
WO2014097400A1
WO2014097400A1 PCT/JP2012/082820 JP2012082820W WO2014097400A1 WO 2014097400 A1 WO2014097400 A1 WO 2014097400A1 JP 2012082820 W JP2012082820 W JP 2012082820W WO 2014097400 A1 WO2014097400 A1 WO 2014097400A1
Authority
WO
WIPO (PCT)
Prior art keywords
light emitting
unit
emitting device
light
control unit
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/JP2012/082820
Other languages
English (en)
Japanese (ja)
Inventor
大志 辻
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.)
Pioneer Corp
Original Assignee
Pioneer 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 Pioneer Corp filed Critical Pioneer Corp
Priority to PCT/JP2012/082820 priority Critical patent/WO2014097400A1/fr
Publication of WO2014097400A1 publication Critical patent/WO2014097400A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2014—Display of intermediate tones by modulation of the duration of a single pulse during which the logic level remains constant
    • 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]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
    • G09G2320/0295—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel by monitoring each display pixel
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G09G2320/048—Preventing or counteracting the effects of ageing using evaluation of the usage time
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature

Definitions

  • the present invention relates to a light emitting device.
  • Some light-emitting devices use organic EL (Organic Electroluminescence) or LED (Light Emitting Diode). There are various methods for controlling the light emission of such a light emitting device.
  • organic EL Organic Electroluminescence
  • LED Light Emitting Diode
  • Patent Literature 1 describes that in a lighting device, a first mode that changes both the light emission amount and the color temperature and a second mode that changes the light emission amount while keeping the color temperature constant are described. Specifically, in the first mode, the drive voltage is controlled, and in the second mode, the duty ratio when the drive voltage is supplied to the light emitting element in pulses is controlled.
  • the light emission amount of the light emitting device under the same conditions decreases as the cumulative driving time becomes longer. Therefore, the present inventor studied to prevent the user of the light emitting device from feeling that the light emitting device became dark.
  • An example of a problem to be solved by the present invention is to prevent the user from feeling that the light emitting device has become dark even when the cumulative driving time of the light emitting device is increased.
  • the invention according to claim 1 is a light emitting unit including at least one light emitting element; A control unit for controlling the light emitting unit; With The control unit acquires degradation information having a correlation with the degradation degree of the light emitting element, and controls the current density supplied to the light emitting unit based on the degradation information, thereby specifying the brightness of the light emitting unit.
  • This is a light emitting device that emits light.
  • FIG. 2 is a block diagram illustrating a functional configuration of a light emitting device according to Example 1.
  • FIG. It is a figure which shows an example of the data which the control data holding part has memorize
  • 6 is a block diagram illustrating a functional configuration of a light emitting device according to Example 2.
  • FIG. It is a figure which shows an example of the data which the control data holding part has memorize
  • 6 is a block diagram showing a functional configuration of a light emitting device according to Example 3.
  • 6 is a cross-sectional view illustrating a configuration of a light emitting element included in a light emitting unit of a light emitting device according to Example 4.
  • each component of each device indicates a functional unit block, not a hardware unit configuration.
  • Each component of each device includes a CPU, memory, a program that realizes the components shown in the figure loaded in the memory, a storage medium such as a hard disk for storing the program, and a network connection interface. It is realized by any combination of software and software. There are various modifications of the implementation method and apparatus.
  • FIG. 1 is a block diagram showing a functional configuration of a light emitting device 10 according to the embodiment.
  • the light emitting device 10 includes a light emitting unit 110 and a control unit 120.
  • the light emitting unit 110 includes at least one light emitting element.
  • the light emitting element is, for example, an organic EL or LED.
  • the control unit 120 controls the light emitting unit 110. Specifically, the control unit 120 acquires deterioration information. The deterioration information has a correlation with the degree of deterioration of the light emitting element included in the light emitting unit 110. Then, the control unit 120 specifies the light emitting unit 110 by controlling the current density supplied to the light emitting unit 110 based on the acquired deterioration information (for example, increasing the current density when it is determined that the deterioration is progressing). The light is emitted with the specified brightness.
  • the control unit 120 controls the current density supplied to the light emitting unit 110 based on the deterioration information. For this reason, even if the cumulative driving time of the light emitting unit 110 becomes longer, it is possible to prevent the user from feeling that the light emitting unit 110 has become dark.
  • FIG. 2 is a block diagram illustrating a functional configuration of the light emitting device 10 according to the first embodiment.
  • the light emitting device 10 includes a light emitting unit 110, a control unit 120, a control data holding unit 125, and a voltage measurement unit 130.
  • the deterioration information is a voltage applied to the light emitting element of the light emitting unit 110 when the current density is set to a predetermined value.
  • the voltage measurement unit 130 measures this voltage and outputs the measurement result to the control unit 120.
  • the degree of deterioration of the light emitting element can be estimated from the measured value of the voltage measuring unit 130.
  • the control data holding unit 125 stores data used when the control unit 120 controls the current density. Specifically, the control data holding unit 125 stores the voltage measured by the voltage measurement unit 130 and the current density corresponding to the voltage in association with each other.
  • FIG. 3 is a diagram illustrating an example of data stored in the control data holding unit 125.
  • the control data holding unit 125 stores data in a table format. Specifically, the control data holding unit 125 stores the difference (voltage increase amount) between the voltage measured by the voltage measurement unit 130 and the reference voltage in association with the current density corresponding to the difference.
  • the control data holding unit 125 may store a function for converting the voltage measured by the voltage measuring unit 130 into a current density supplied to the light emitting element.
  • the control unit 120 of the light emitting device 10 drives the light emitting elements of the light emitting unit 110 at a predetermined current density.
  • the voltage measurement unit 130 measures the voltage at that time and outputs the voltage to the control unit 120.
  • the control unit 120 determines the current density to be supplied to the light emitting element of the light emitting unit 110 using the voltage output from the voltage measuring unit 130 and the data stored in the control data holding unit 125.
  • the light emitting unit 110 causes the light emitting element of the light emitting unit 110 to emit light at the determined current density.
  • the above-described deterioration information measurement mode may be performed periodically, or may be performed when there is an input from the user of the light emitting device 10.
  • the brightness of the light emitting device 10 may be controlled in a plurality of stages. In this case, the above-described operation may be performed for each brightness.
  • the voltage measuring unit 130 measures the voltage applied to the light emitting element of the light emitting unit 110 when the current density is set to a predetermined value. And the control part 120 will also raise the current density of the light emitting element of the light emission part 110, if the measurement result of the voltage measurement part 130 rises. For this reason, even if the cumulative driving time of the light emitting unit 110 becomes longer and the light emitting element deteriorates, it is possible to prevent the user from feeling that the light emitting unit 110 has become dark.
  • FIG. 4 is a block diagram illustrating a functional configuration of the light emitting device 10 according to the second embodiment.
  • the light emitting device 10 according to the present example has the same configuration as that of the light emitting device 10 according to Example 1 except for the following points.
  • the light emitting device 10 uses the accumulated light emission time of the light emitting element included in the light emitting unit 110 as deterioration information. For this reason, the light emitting device 10 includes a time accumulating unit 132 instead of the voltage measuring unit 130.
  • the time accumulating unit 132 measures the accumulated light emission time of the light emitting element included in the light emitting unit 110. The measurement result of the time accumulating unit 132 is output to the control unit 120.
  • FIG. 5 is a diagram illustrating an example of data stored in the control data holding unit 125 in the present embodiment.
  • the control data holding unit 125 stores data in a table format. Specifically, the control data holding unit 125 stores the accumulated light emission time measured by the time accumulation unit 132 in association with the current density.
  • the control data holding unit 125 may store a function for converting the accumulated light emission time measured by the time accumulation unit 132 into a current density supplied to the light emitting element.
  • FIG. 6 is a block diagram illustrating a functional configuration of the light emitting device 10 according to the third embodiment.
  • the light emitting device 10 according to this example has the same configuration as the light emitting device 10 according to Example 1 or 2 except for the following points.
  • FIG. 6 shows the same case as in the first embodiment.
  • the control unit 120 has a PWM (pulse width modulation) control unit 123. That is, the control unit 120 supplies current to the light emitting element included in the light emitting unit 110 in a pulse shape.
  • the PWM control unit 123 controls the duty ratio so that the average value of the current density supplied to the light emitting elements of the light emitting unit 110 is constant regardless of the deterioration information.
  • the control unit 120 includes a power supply unit 121, a current control unit 122, and a PWM control unit 123.
  • the power supply unit 121 supplies power to the light emitting unit 110.
  • the current control unit 122 connects the power supply unit 121 to the light emitting unit 110 and controls the current density supplied from the power supply unit 121 to the light emitting unit 110.
  • the PWM control unit 123 changes the timing at which the current control unit 122 supplies current to the light emitting unit 110 in a pulse shape. That is, the control unit 120 controls the current density by the current control unit 122, and controls the timing at which the current having the density controlled by the current control unit 122 is supplied by the PWM control unit 123. As a result, the time average value of the current density shared from the current control unit 122 is constant.
  • an AC-DC converter is provided between the power supply unit 121 and the current control unit 122.
  • FIG. 7 is a diagram illustrating an example of data stored in the control data holding unit 125 according to the present embodiment.
  • the control data holding unit 125 stores the voltage difference in association with the duty ratio in addition to the data shown in FIG.
  • the control data holding unit 125 may store a function for converting the voltage difference into a current density supplied to the light emitting element and a function for converting the voltage difference into a duty ratio.
  • the control data holding unit 125 associates the accumulated light emitting time with the duty ratio in addition to the data illustrated in FIG. I remember it.
  • the control data holding unit 125 may store a function for converting the accumulated light emission time into a current density supplied to the light emitting element and a function for converting the accumulated light emission time into a duty ratio.
  • the same effects as those in Embodiments 1 and 2 can be obtained. Further, the time average value of the current density shared from the current control unit 122 is constant regardless of the deterioration information. For this reason, the load to the light emitting element which the light emission part 110 has becomes small, and it can suppress that deterioration of a light emitting element becomes quick. This effect is particularly great when the light emitting element is an organic EL.
  • FIG. 8 is a cross-sectional view illustrating a configuration of a light emitting element included in the light emitting unit 110 of the light emitting device 10 according to the fourth embodiment.
  • the light emitting device 10 according to the present example has the same configuration as that of any of the light emitting devices 10 according to Examples 1 to 3, except for the configuration of the light emitting element.
  • the light emitting element of the light emitting unit 110 includes a translucent substrate 111, a first electrode 112, an organic functional layer 140, and a second electrode 115.
  • the first electrode 112 is formed on the first surface side of the translucent substrate 111 and has translucency.
  • the organic functional layer 140 is located on the opposite side to the translucent substrate 111 with the first electrode 112 interposed therebetween.
  • the organic functional layer 140 has a light emitting layer.
  • the second electrode 115 is located on the side opposite to the first electrode 112 with the organic functional layer 140 interposed therebetween. In this embodiment, the light emitted from the organic functional layer 140 is extracted from the translucent substrate 111 side.
  • the organic functional layer 140 has a configuration in which a hole injection layer 142, a hole transport layer 144, a light emitting layer 146, and an electron injection layer 148 are stacked on the first electrode 112 in this order. Note that an electron-transport layer may be provided between the light-emitting layer 146 and the electron-injection layer 148.
  • the stacked structure of the hole injection layer 142, the hole transport layer 144, the light emitting layer 146, the electron injection layer 148, and the second electrode 115 is divided into a plurality of regions. Specifically, these stacked structures extend in parallel to each other in a direction perpendicular to the paper surface. Adjacent stacked structures are separated from each other by a partition wall 114.
  • the partition 114 is, for example, a photosensitive resin such as polyimide, and is formed in a desired pattern by being exposed and developed.
  • the partition 114 may be a resin other than polyimide, such as an epoxy resin or an acrylic resin.
  • the adjacent light emitting layers 146 have different emission spectra, for example, different maximum peak wavelengths. Specifically, as the light-emitting layer 146, a layer that emits red light, a layer that emits green light, and a layer that emits blue light are repeatedly arranged. For this reason, the light emitting device 10 includes a linear region that emits red light, a linear region that emits green light, and a linear region that emits blue light in a plan view. become.
  • the first electrode 112 is formed as an electrode common to the plurality of light emitting layers 146.
  • An auxiliary electrode 113 is formed on a portion of the first electrode 112 covered with the partition wall 114.
  • the auxiliary electrode 113 is formed using, for example, Ag or Al, and has a resistance lower than that of the first electrode 112.
  • the auxiliary electrode 113 functions as an auxiliary electrode for reducing the apparent resistance of the first electrode 112.
  • the light-emitting layer 146 may be configured to emit light in a single emission color such as white by mixing materials for emitting a plurality of colors, or may have different emission spectra.
  • a plurality of layers (for example, a layer emitting red light, a layer emitting green light, and a layer emitting blue light) may be stacked.
  • the structure of the light-emitting element included in the light-emitting portion 110 is not limited to the structure shown in Embodiment 4.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

L'invention concerne un appareil électroluminescent (10) doté d'une unité électroluminescente (110) et d'une unité (120) de commande. L'unité électroluminescente (110) comprend au moins un élément électroluminescent. L'élément électroluminescent est, par exemple, un EL organique ou une DEL. L'unité (120) de commande assure la commande de l'unité électroluminescente (110). Plus particulièrement, l'unité (120) de commande acquiert des informations de détérioration. Les informations de détérioration sont corrélées avec un degré de détérioration de l'élément électroluminescent de l'unité électroluminescente (110). Sur la base des informations de détérioration ainsi acquises, l'unité (120) de commande fait en sorte que l'unité électroluminescente (110) émette de la lumière avec une luminance spécifiée en régulant la densité d'un courant à fournir à l'unité électroluminescente (110).
PCT/JP2012/082820 2012-12-18 2012-12-18 Appareil électroluminescent Ceased WO2014097400A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2012/082820 WO2014097400A1 (fr) 2012-12-18 2012-12-18 Appareil électroluminescent

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2012/082820 WO2014097400A1 (fr) 2012-12-18 2012-12-18 Appareil électroluminescent

Publications (1)

Publication Number Publication Date
WO2014097400A1 true WO2014097400A1 (fr) 2014-06-26

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PCT/JP2012/082820 Ceased WO2014097400A1 (fr) 2012-12-18 2012-12-18 Appareil électroluminescent

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Country Link
WO (1) WO2014097400A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002100471A (ja) * 2000-09-22 2002-04-05 Sanyo Electric Co Ltd 有機エレクトロルミネッセンス素子の駆動方法、駆動装置およびそれを用いた表示装置
JP2003511746A (ja) * 1999-10-12 2003-03-25 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Ｌｅｄ表示装置
JP2005128272A (ja) * 2003-10-24 2005-05-19 Pioneer Electronic Corp 画像表示装置
WO2005106835A1 (fr) * 2004-04-30 2005-11-10 Fuji Photo Film Co., Ltd. Dispositif électroluminescent organique capable de réguler la chromaticité
JP2007140325A (ja) * 2005-11-22 2007-06-07 Seiko Epson Corp 発光制御装置、表示装置、電子機器、および発光装置の制御方法
JP2011049015A (ja) * 2009-08-26 2011-03-10 Panasonic Electric Works Co Ltd 有機ｅｌ素子点灯装置及びそれを備えた発光モジュール並びに照明器具
JP2012129050A (ja) * 2010-12-15 2012-07-05 Konica Minolta Holdings Inc 発光装置、発光素子の駆動方法、及び照明装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003511746A (ja) * 1999-10-12 2003-03-25 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Ｌｅｄ表示装置
JP2002100471A (ja) * 2000-09-22 2002-04-05 Sanyo Electric Co Ltd 有機エレクトロルミネッセンス素子の駆動方法、駆動装置およびそれを用いた表示装置
JP2005128272A (ja) * 2003-10-24 2005-05-19 Pioneer Electronic Corp 画像表示装置
WO2005106835A1 (fr) * 2004-04-30 2005-11-10 Fuji Photo Film Co., Ltd. Dispositif électroluminescent organique capable de réguler la chromaticité
JP2007140325A (ja) * 2005-11-22 2007-06-07 Seiko Epson Corp 発光制御装置、表示装置、電子機器、および発光装置の制御方法
JP2011049015A (ja) * 2009-08-26 2011-03-10 Panasonic Electric Works Co Ltd 有機ｅｌ素子点灯装置及びそれを備えた発光モジュール並びに照明器具
JP2012129050A (ja) * 2010-12-15 2012-07-05 Konica Minolta Holdings Inc 発光装置、発光素子の駆動方法、及び照明装置

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