WO2019058442A1 - Display device and method for driving display device - Google Patents

Abstract

The display device (2) comprises a plurality of measurement sub-pixels (MSP) outside the active area (AC) and not contributing to the display of the image, the measurement sub-pixels (MSP) comprising an anode (22) and a cathode (25). ) Is connected to a measurement circuit (MC) that measures the voltage value between them). Thus, the voltage applied to the light emitting layer is adjusted in accordance with the degree of deterioration of the light emitting layer.

Description

Display device and driving method of display device

The present invention relates to a display device and a method of driving the display device.

In patent document 1, the voltage drop of a self-light-emitting element is measured with a voltage detection circuit, and the voltage applied to the said self-light-emitting element is adjusted based on the said voltage drop.

Japanese Patent Publication "Japanese Patent Application Laid-Open No. 2001-56670"

Patent Document 1 does not describe how to provide the voltage detection circuit for measuring the voltage drop of the self light emitting element.

A display device according to an aspect of the present invention includes a plurality of display sub-pixels provided in an active area contributing to the display of an image, and a plurality of measurement sub-pixels outside the active area and not contributing to the display of the image. And the plurality of display sub-pixels are provided with a light-emitting layer, a first electrode provided for each of the plurality of display sub-pixels, and a second electrode disposed opposite to the first electrode with the light-emitting layer interposed therebetween. A plurality of measurement sub-pixels including an electrode, a light emitting layer, a first electrode provided for each of the plurality of measurement sub-pixels, and a first electrode disposed opposite to the first electrode with the light emitting layer interposed therebetween A measurement circuit including two electrodes and measuring a voltage value between the first electrode and the second electrode is connected to each of the plurality of measurement sub-pixels.

A method of driving a display device according to an aspect of the present invention is a method of driving a display device, wherein the display device includes a plurality of display sub-pixels provided in an active region contributing to the display of an image, and the active region And a plurality of measurement sub-pixels that do not contribute to the display of the image, the plurality of display sub-pixels being a light emitting layer, a first electrode provided for each of the plurality of display sub-pixels, and the light emission The plurality of measurement sub-pixels include a light emitting layer, a first electrode provided for each of the plurality of measurement sub-pixels, and a plurality of measurement sub-pixels including a second electrode disposed opposite to the first electrode with a layer interposed therebetween. The first electrode included in the measurement sub-pixel by the respective measurement circuits connected to each of the plurality of measurement sub-pixels including the second electrode arranged to face the first electrode with the light emitting layer interposed therebetween. And Characterized by the step of measuring a voltage value between the electrodes.

According to one aspect of the present invention, the voltage applied to the light emitting layer can be adjusted according to the degree of deterioration of the light emitting layer.

It is a flowchart which shows an example of the manufacturing method of a display device. It is sectional drawing which shows the structural example of the display part of a display device. It is a top view which shows the structural example of a display device. FIG. 2 is a plan view showing a pixel of the display device of Embodiment 1. FIG. 2 is a diagram illustrating a configuration of a sub-pixel circuit disposed in the sub-pixel of Embodiment 1. FIG. 6 is a diagram illustrating the configuration of a sub-pixel circuit and a measurement circuit arranged in the measurement sub-pixel of Embodiment 1. FIG. 2 is a functional block diagram showing a configuration of a deterioration information generation unit of Embodiment 1. FIG. 7 is a diagram showing an active area and a dummy area of the display device of Embodiment 2. FIG. 6 is a diagram showing a flowchart of voltage compensation operation of the display device of Embodiment 1. FIG. 13 is a diagram illustrating a flowchart of voltage compensation operation of the display device of Embodiment 2. FIG. 6 is a diagram showing the relationship between the gradation voltage applied to the light emitting element of Embodiment 1 and the luminance. FIG. 6 is a graph showing the relationship between the potential difference between both ends of the light emitting element of Embodiment 1 and the luminance. FIG. 7 is a diagram illustrating a configuration of a display device according to a first modified example of the first embodiment. FIG. 16 is a diagram illustrating a configuration of a display device according to a second modified example of the first embodiment.

FIG. 1 is a flowchart showing an example of a method of manufacturing a display device. FIG. 2 is a cross-sectional view showing a configuration example of the display unit of the display device 2. FIG. 3 is a plan view showing a configuration example of the display device 2. In the following, “same layer” means being formed of the same material in the same process, and “lower layer” means being formed in a process earlier than the layer to be compared , "Upper layer" means that it is formed in a later process than the layer to be compared.

In the case of manufacturing a flexible display device, first, as shown in FIGS. 1 to 3, the resin layer 12 is formed on a translucent support substrate (for example, a mother glass substrate) (step S1). Next, the barrier layer 3 is formed (step S2). Next, the TFT layer 4 including the terminal TM and the terminal wiring TW is formed (step S3). Next, a top emission type light emitting element layer (for example, an OLED element layer) 5 is formed (step S4). Next, the sealing layer 6 is formed (step S5). Then, an upper film is attached on the sealing layer 6 (step S6).

Next, the lower surface of the resin layer 12 is irradiated with laser light through the support substrate to reduce the bonding strength between the support substrate and the resin layer 12, and the support substrate is peeled off from the resin layer 12 (step S7). Next, the lower film 10 is attached to the lower surface of the resin layer 12 (step S8). Next, the laminate including the lower surface film 10, the resin layer 12, the barrier layer 3, the TFT layer 4, the light emitting element layer 5, and the sealing layer 6 is divided to obtain a plurality of pieces (step S9). Next, the functional film 39 is attached to the obtained piece (step S10). Next, an electronic circuit board (for example, an IC chip) is mounted on the terminal TM of the edge portion (step S11). Next, edge folding (processing to fold the bent portion CL in FIG. 3 by 180 degrees) is performed to obtain the display device 2 (step S12). Next, a disconnection inspection is performed, and if there is a disconnection, correction is performed (step S13). In addition, the below-mentioned display device manufacturing apparatus performs said each step.

Examples of the material of the resin layer 12 include polyimide, epoxy, polyamide and the like. Examples of the material of the lower film 10 include polyethylene terephthalate (PET).

The barrier layer 3 is a layer that prevents moisture and impurities from reaching the TFT layer 4 and the light emitting element layer 5 when the display device 2 is used. For example, a silicon oxide film or a silicon nitride film formed by CVD Or a silicon oxynitride film, or a laminated film of these.

The TFT layer 4 includes the semiconductor film 15, the inorganic insulating film 16 (gate insulating film) above the semiconductor film 15, the gate electrode GE above the inorganic insulating film 16, and the inorganic insulating layer above the gate electrode GE. Film 18, the capacitive wiring CE above the inorganic insulating film 18, the inorganic insulating film 20 above the capacitive wiring CE, the source wiring SH and the terminal TM above the inorganic insulating film 20, and the source wiring SH And a planarizing film 21 above the terminal TM.

The thin film transistor Tr (TFT) is configured to include the semiconductor film 15, the inorganic insulating film 16 (gate insulating film), and the gate electrode GE.

In the non-active area NA of the TFT layer 4, a terminal TM used for connection with an electronic circuit substrate such as an IC chip, an FPC, etc., a terminal wiring TW connecting the terminal TM and the wiring of the active area AC, etc. A dummy region DM adjacent to and surrounding the outer periphery of the active region AC is formed.

The semiconductor film 15 is made of, for example, low temperature polysilicon (LTPS) or an oxide semiconductor. Although FIG. 2 shows a TFT in which the semiconductor film 15 is a channel in a top gate structure, it may have a bottom gate structure (for example, when the channel of the TFT is an oxide semiconductor).

For example, aluminum (Al), tungsten (W), molybdenum (Mo), tantalum (Ta), chromium (Cr), titanium (gate electrode GE, capacitance electrode CE, source wiring SH, terminal wiring TW, and terminal TM) are used. It is comprised by the single layer film or laminated film of the metal containing at least one of Ti) and copper (Cu).

The inorganic insulating films 16, 18 and 20 can be formed of, for example, a silicon oxide (SiOx) film, a silicon nitride (SiNx) film, or a laminated film thereof formed by a CVD method.

The planarizing film (interlayer insulating film) 21 can be made of, for example, a coatable photosensitive organic material such as polyimide or acrylic.

The light emitting element layer 5 (for example, an organic light emitting diode layer) has an anode 22 (first electrode, second electrode) above the planarization film 21, a bank 23 covering the edge of the anode 22, and an upper layer above the anode 22. Of the EL (electroluminescent) layer 24 and the cathode 25 (second electrode, first electrode) above the EL layer 24, and for each sub-pixel (display sub-pixel) SP, an island-shaped anode 22, EL A light emitting element (for example, an OLED: organic light emitting diode) including the layer 24 and the cathode 25 and a sub-pixel circuit for driving the light emitting element are provided. The anode 22 and the cathode 25 are opposed to each other with the EL layer 24 interposed therebetween.

The bank 23 (anode edge cover) can be made of, for example, a coatable photosensitive organic material such as polyimide or acrylic.

The EL layer 24 is configured, for example, by laminating a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer in order from the lower layer side. The light emitting layer is formed in an island shape for each sub-pixel by a vapor deposition method or an ink jet method, but the other layers can also be a solid common layer. Moreover, the structure which does not form one or more layers among a positive hole injection layer, a positive hole transport layer, an electron carrying layer, and an electron injection layer is also possible.

The anode (anode) 22 is formed of, for example, a laminate of ITO (Indium Tin Oxide) and an alloy containing Ag, and has light reflectivity. The cathode 25 can be made of a light-transmitting conductive material such as ITO (Indium Tin Oxide) or IZO (Indium Zincum Oxide).

When the light emitting element layer 5 is an OLED layer, the drive current between the anode 22 and the cathode 25 causes holes and electrons to recombine in the EL layer 24 and the resulting excitons fall to the ground state, whereby light is generated. Released. Since the cathode 25 is translucent and the anode 22 is light reflective, the light emitted from the EL layer 24 is directed upward to be top emission.

The light emitting element layer 5 is not limited to forming an OLED element, and may form an inorganic light emitting diode or a quantum dot light emitting diode.

The sealing layer 6 is translucent, and the first inorganic sealing film 26 covering the cathode 25, the organic sealing film 27 formed on the upper side of the first inorganic sealing film 26, and the organic sealing film 27. And a second inorganic sealing film 28 covering the The sealing layer 6 covering the light emitting element layer 5 prevents the penetration of foreign matter such as water and oxygen into the light emitting element layer 5.

Each of the first inorganic sealing film 26 and the second inorganic sealing film 28 may be formed of, for example, a silicon oxide film, a silicon nitride film, a silicon oxynitride film, or a laminated film thereof formed by CVD. it can. The organic sealing film 27 is a translucent organic film that is thicker than the first inorganic sealing film 26 and the second inorganic sealing film 28, and is made of a coatable photosensitive organic material such as polyimide or acrylic. Can.

The lower surface film 10 is for adhering to the lower surface of the resin layer 12 after peeling off the support substrate to realize a display device excellent in flexibility. Examples of the material include PET and the like. The functional film 39 has, for example, an optical compensation function, a touch sensor function, a protection function, and the like.

As described above, although the case of manufacturing a flexible display device has been described, in the case of manufacturing a non-flexible display device, for example, the process proceeds from step S5 to step S9 in FIG.

Embodiment 1
(Pixel array)
FIG. 4 is a plan view showing a pixel of the display device 2 in the first embodiment.

The display device 2 includes, in the display portion, source wirings SH arranged in parallel to each other and gate wirings GH arranged in parallel to each other. Each source wiring SH and each gate wiring GH are orthogonal to each other. A pixel area is formed in an area divided into each source wiring SH and each gate wiring GH.

A source driver 41 connected to each source wiring SH, a gate driver 42 connected to each gate wiring, and a deterioration information generation unit 50 are disposed outside the display unit. The source driver 41 supplies a driving voltage, which is a voltage value corresponding to an image to be displayed, via each source wiring SH to each anode 22 (see FIG. 2), and the gate driver 42 scans each gate wiring GH. Display an image in the active area AC. The details of the deterioration information generation unit 50 will be described later.

As shown in FIGS. 2 to 4, the display unit of the display device 2 is provided with an active area AC contributing to the display of an image, and a dummy area DM surrounding the outer periphery of the active area AC and not contributing to the display of the image. ing.

As shown in FIG. 2 and FIG. 4, pixels PIX are provided in a matrix in the active region AC. The pixel PIX has a plurality of sub-pixels SP. For example, the pixel PIX includes a red sub-pixel RSP having a light-emitting layer emitting red light, a green sub-pixel GSP having a light-emitting layer emitting green light, and a blue sub-pixel BSP having a light-emitting layer emitting blue light. Have.

In the present embodiment, the sub-pixels SP are in a stripe arrangement in which the red sub-pixels RSP, the green sub-pixels GSP, and the blue sub-pixels BSP are aligned in a straight line, but the arrangement of the sub-pixels SP is It may be an array.

As described above, each sub-pixel SP is provided with the light-emitting element including the anode 22, the EL layer 24, and the cathode 25 and the sub-pixel circuit PC including the thin film transistor Tr (TFT). The red sub-pixel RSP is provided with an EL layer 24 for emitting red light, the green sub-pixel GSP is provided with an EL layer 24 for emitting green light, and the blue sub-pixel BSP is provided with an EL layer 24 for emitting blue light. Is provided. In addition, the EL layer 24 of each sub-pixel SP is sealed by the sealing layer 6.

In the dummy region DM, a plurality of dummy sub-pixels DSP arranged in the same pattern as the sub-pixels SP are arranged in a matrix. The dummy sub-pixel DSP is outside the active area AC and adjacent to the active area AC. The dummy sub-pixel DSP is provided to secure positional accuracy of a mask for forming a vapor deposition film of the sub-pixel SP in the active region AC.

The dummy sub-pixel DSP is formed in the same process as the sub-pixel SP. Similar to the sub-pixel SP, the dummy sub-pixel DSP is provided with a light-emitting element including the anode 22, the EL layer 24, and the cathode 25 and a sub-pixel circuit PC including a thin film transistor Tr (TFT). The dummy sub-pixel DSP only needs to be provided with at least the EL layer 24 and the cathode 25, and the dummy sub-pixel DSP may not be provided except the EL layer 24 and the cathode 25. The dummy sub-pixel DSP does not contribute to the display of the image. In the dummy area DM, since a pixel circuit contributing to display is unnecessary, a measurement circuit can be provided in the dummy area DM.

In addition to the light emitting elements, a measurement circuit MC is further provided in part of the plurality of dummy sub-pixels DSP. The measurement circuit MSC is a circuit for sensing the degree of deterioration of the EL layer 24 by measuring the voltage value between the anode 22 and the cathode 25 as described later. The dummy sub-pixel DSP to which the measurement circuit MC is connected is referred to as a measurement sub-pixel MSP.

The measurement sub-pixel MSP is provided outside the active region AC and adjacent to the active region AC. Further, in the dummy region DM, a region where the measurement sub-pixel MSP is provided is referred to as a measurement region MA.

The plurality of measurement sub-pixels MSP are provided for each emission color of the plurality of sub-pixels SP. A plurality of measurement pixels MPIX including a pair of measurement sub-pixels arranged in the same arrangement as the plurality of sub-pixels SP constituting one pixel PIX are provided adjacent to the active region AC.

For example, the measurement pixel MPIX has a red measurement sub-pixel RMSP, a green measurement sub-pixel GMSP, and a blue measurement sub-pixel BMSP. The red measurement sub-pixel RMSP has a light emitting layer that emits the same red light as the red sub-pixel RSP. The green measurement sub-pixel GMSP has a light emitting layer that emits the same green light as the green sub-pixel GSP. The blue measurement sub-pixel BMSP has a light emitting layer that emits the same blue light as the blue sub-pixel BSP.

The measurement circuit MC provided in the red measurement sub-pixel RMSP is referred to as a red measurement circuit RMC, the measurement circuit MC provided in the green measurement sub-pixel GMSP is referred to as a green measurement circuit GMC, and the measurement provided in the blue measurement sub-pixel BMSP The circuit MC is referred to as the blue measuring circuit BMC.

The measurement pixels MPIX are provided, for example, adjacent to four corners of the active region AC. That is, in the present embodiment, four measurement areas MA are provided adjacent to the four corners of the active area AC. For example, each measurement area MA is provided with measurement pixels MPIX for three pixels (that is, 3 × 3 = 9 measurement sub-pixels MSP).

The position where the measurement area MA is provided is not limited to the position adjacent to the four corners of the active area AC, but may be provided adjacent to the side between the corners of the active area AC. The number of measurement areas MA may be one to three, or five or more. In addition, the number of measurement pixels MPIX provided in each measurement area MA may be less than three or four or more.

Further, as shown in FIG. 13, the measurement circuit MC may be electrically connected to the dummy sub-pixel DSP (the measurement sub-pixel MSP), and is not provided in the dummy sub-pixel DSP (the measurement sub-pixel MSP). It may be provided outside the measurement area MA and in the dummy area DM.

The plurality of measurement sub-pixels MSP are preferably shielded from light in order not to contribute to display.

Alternatively, as shown in FIG. 14, the bent portion CL may be interposed between the measurement area MA (that is, the measurement sub-pixel MSP) and the active area AC. Thereby, the dummy area DM including the plurality of measurement sub-pixels MSP can be bent by 180 degrees so as not to contribute to the display.

(Sub-pixel circuit and measurement circuit)
FIG. 5 is a diagram showing the configuration of the sub-pixel circuit PC provided in the sub-pixel SP of the first embodiment. FIG. 6 is a diagram showing the configuration of the sub-pixel circuit PC and the measurement circuit MC provided in the measurement sub-pixel MSP of the first embodiment. 5 and 6 show the configuration of the sub-pixel circuit PC corresponding to m columns and n rows. The configuration of the sub-pixel circuit PC described here is an example, and other configurations may be adopted.

As described above, m source wirings SH [m] and n gate wirings GH [n] orthogonal to these source wirings SH [m] are disposed in the display portion of the display device 2. Note that m and n are arbitrary natural numbers.

In the display portion, a light emission control line em [n] is provided to correspond to each gate wiring GH [n] on a one-to-one basis. Further, in the display unit, a power supply line common to the sub-pixel circuits PC is formed. More specifically, a high level power supply line ELVDD for supplying ELVDD (high level power supply voltage) for driving the light emitting element OLED, and a low level power supply for supplying ELVSS (low level power supply voltage) for driving the light emitting element OLED. An initialization power supply line Vini [n] for supplying lines ELVSS and Vini (initialization voltage) is provided.

As shown in FIGS. 5 and 6, preferably, the sub-pixel circuit PC provided in the sub-pixel SP and the sub-pixel circuit PC provided in the measurement sub-pixel MSP have the same configuration. This is to match the degree of deterioration of the measurement sub-pixel MSP with time to the degree of deterioration of the sub-pixel SP. The video signal supplied to the measurement sub-pixel MSP is, for example, an average video signal of all the sub-pixels of each color.

The sub-pixel circuit PC is supplied with ELVDD from the high level power supply line ELVDD, and controls the drive voltage applied to the EL layer 24 (see FIG. 2) included in the light emitting element OLED.

In the present embodiment, the sub-pixel circuit PC includes one light emitting element OLED, seven transistors T1 to T7, and one capacitor C1.

The transistors T1 to T7 are, for example, p-channel thin film transistors (TFTs). The capacitor C1 is a capacitive element formed of two electrodes and an insulating film sandwiched therebetween.

The light emitting element OLED is a light emitting diode, and corresponds to the light emitting element layer 5 (see FIG. 2). That is, the light emitting device OLED includes an anode 22 (see FIG. 2), an EL layer 24 and a cathode 25. A drive voltage corresponding to an image to be displayed is supplied from the source driver 41 to the anode 22. The cathode 25 is supplied with ELVSS which is a constant voltage different from ELVDD.

The transistor T1 is an initialization transistor, the transistor T2 is a threshold voltage compensation transistor, the transistor T3 is a write control transistor, the transistor T4 is a drive transistor, the transistor T5 is a power supply control transistor, and the transistor T6 is a light emission The transistor T7 is a control transistor, and the transistor T7 is an anode charge discharge transistor of the light emitting element OLED.

The high level power supply circuit (not shown) is connected to the capacitor C1 and the transistor T5 via the high level power supply line ELVDD.

In the transistor T1, the gate electrode is connected to the gate wiring GH [n-1], the source electrode is connected to the initialization power supply line Vini [n], and the drain electrode is connected to the capacitor C1 and the gate electrode of the transistor T4. ing.

The transistor T2 compensates for the threshold voltage of the transistor T4. In the transistor T2, the gate electrode is connected to the gate wiring GH [n] and the gate electrode of the transistor T3, the source electrode is connected between the drain electrode of the transistor T4 and the source electrode of the transistor T6, and the drain electrode is a transistor It is connected to the gate electrode of T4 and between the capacitor C1 and the drain electrode of the transistor T1.

The gate electrode of the transistor T3 is connected to the gate wiring GH [n] and the gate electrode of the transistor T2, the source electrode is connected to the source wiring SH [m], and the drain electrode is connected to the source electrode of the transistor T4 and the transistor It is connected to the drain electrode of T5.

The transistor T4 has a gate electrode connected to the drain electrode of the transistor T2 and a capacitor C1 connected between the drain electrodes of the transistor T1, and a source electrode connected between the drain electrode of the transistor T3 and the drain electrode of the transistor T5. The drain electrode is connected to the source electrode of the transistor T2 and the source electrode of the transistor T6.

The transistor T5 has a gate electrode connected to the light emission control line em [n] and the gate electrode of the transistor T6, a source electrode connected to the high level power supply line ELVDD and the capacitor C1, and a drain electrode connected to the source of the transistor T4. It is connected to the electrode and the drain electrode of the transistor T3.

The gate electrode of the transistor T6 is connected to the light emission control line em [n] and the gate electrode of the transistor T5, the source electrode is connected to the drain electrode of the transistor T4 and the source electrode of the transistor T2, and the drain electrode emits light It is connected to the anode of the element OLED and the drain electrode of the transistor T7.

The transistor T7 is a transistor for resetting the charge accumulated in the anode of the light emitting element OLED immediately before writing data in the light emitting element OLED. The gate electrode of the transistor T7 is connected to the gate wiring GH [n], the source electrode is connected to the initialization power supply line Vini [n], and the drain electrode is the drain electrode of the transistor T6 and the anode of the light emitting element OLED. Connected with.

As shown in FIG. 6, one end of the measurement circuit MC is connected to the anode of the light emitting element OLED, and the other end is connected to the cathode of the light emitting element OLED. The measurement circuit MC measures the voltage VF between the anode and the cathode of the light emitting element OLED, and outputs the measured voltage value of the voltage VF to the deterioration information generation unit 50 as measurement data.

(Voltage compensation operation)
FIG. 7 is a functional block diagram showing the configuration of the deterioration information generation unit 50. As shown in FIG. FIG. 9 is a diagram illustrating a flowchart of the voltage compensation operation of the display device 2 according to the first embodiment. FIG. 11 is a diagram showing the relationship between the gradation voltage applied to the light emitting element OLED and the luminance. FIG. 12 is a diagram showing the relationship between the potential difference between both ends of the light emitting element OLED and the luminance.

As shown in FIG. 7, the degradation information generation unit 50 includes a red degradation information generation unit 51R, a green degradation information generation unit 51G, a blue degradation information generation unit 51B, and a data storage unit 52.

In the data storage unit 52, luminance data representing the relationship between the voltage value and the luminance value is stored for each luminescent color. For example, in the data storage unit 52, red brightness data indicating the relationship between the voltage value of the light emitting layer emitting red light and the brightness, and green brightness indicating the relationship between the voltage value of the light emitting layer emitting green light and the brightness Data and blue brightness data indicating the relationship between the voltage value of the light emitting layer that emits blue light and the brightness are stored.

11 and 12 show an example of the luminance data stored in the data storage unit 52. FIG.

As shown by gradations Vgs1 to Vgs6 in FIG. 11, as the gradation becomes larger, the luminance of the light emitting element OLED also becomes larger.

The horizontal axis of the graph in FIG. 12 represents ELVDD-ELVSS = the potential difference between both ends of the light emitting element OLED (that is, the voltage VF of the light emitting element OLED), and the vertical axis represents the luminance of the light emitting element OLED. Data 1 to data 6 in FIG. 12 are source signals supplied from the source driver 41 to the respective source electrodes according to the image (according to the gradation). The gradation Vgs1 = ELVDD-data1, the gradation Vgs2 = ELVDD-data2, the gradation Vgs3 = ELVDD-data3, the gradation Vgs4 = ELVDD-data4, the gradation Vgs5 = ELVDD-data5, The gradation voltage Vgs6 = ELVDD-data6.

As shown in FIG. 7, the display device 2 performs a voltage compensation operation. The voltage compensation operation is to adjust the drive voltage supplied to the anode 22 by the source driver 41 in accordance with the deterioration state of the light emitting layer. Specifically, in the voltage compensation operation, the degradation information generation unit 50 generates degradation information indicating the degradation state of the light emitting element OLED based on the voltage value measured by the measurement circuit MC, and the source based on the degradation information The driver 41 adjusts the drive voltage to be supplied to the anode 22.

The timing at which the display device 2 performs this voltage compensation operation may be performed when the power of the display device 2 is turned on, or may be performed at predetermined intervals (in this case, the output of a normal video signal is stopped) Or when the power of the display device 2 is turned off, it may be other timing.

As shown in FIG. 9, when the display device 2 starts the voltage compensation operation according to a predetermined timing or an instruction from the user (step T1), the source driver 41 selects each of the measurement areas MA (four in this embodiment). The measurement voltage is supplied to the measurement sub-pixel MSP (in this embodiment, nine measurement sub-pixels × 4 in this embodiment) (step T2). The measurement voltage is, for example, a voltage having an arbitrary gradation such as 0 gradation or 255 gradation.

Then, next, each measurement circuit MC (in this embodiment, nine measurement sub-pixels × four in this embodiment) of each measurement area MA (four in the present embodiment), the anode 22 to which the measurement voltage is supplied, and ELVSS The voltage VF between the cathodes 25 supplied is output as measurement data to the deterioration information generation unit 50 (step T3).

Specifically, in each red measurement sub-pixel RMP, each red measurement circuit RMS (in this embodiment, three red measurement circuits × 4 locations) is supplied with the anode 22 to which the measurement voltage is supplied, and ELVSS. The voltage VF across the cathode 25 is output to the red degradation information generation unit 51R as red measurement data. In addition, each green measuring circuit GMS (three green measuring circuits × 4 in this embodiment) includes an anode 22 to which a measuring voltage is supplied and a cathode 25 to which ELVSS is supplied in each green measuring sub-pixel GMP. Voltage VF is output to the green deterioration information generation unit 51G as green measurement data. In each blue measurement sub-pixel BMP, each blue measurement circuit BMS (in this embodiment, three blue measurement circuits × 4 locations) is between the anode 22 to which the measurement voltage is supplied and the cathode 25 to which ELVSS is supplied. The voltage VF is output to the blue deterioration information generation unit 51B as blue measurement data.

Next, the deterioration information generation unit 50 averages the voltage value indicated by the measurement data supplied from each measurement circuit MS for each luminescent color, and calculates the average measurement data for each luminescent color that is the average value (step T4). . Then, the deterioration information generation unit 50 compares the average measurement data with the luminance data stored in the data storage unit 52 for each luminescent color (step T5). Then, the deterioration information generation unit 50 calculates, for each light emission color, the difference value between the voltage value indicated by the average measurement data and the voltage value that achieves the desired luminance, and uses the calculated voltage value as the deterioration information for each light emission color. It outputs to the driver 41 (step T6).

Specifically, the red deterioration information generation unit 51R averages the voltage values indicated by the red measurement data supplied from the respective red measurement circuits RMS (in the present embodiment, an average of three red measurement circuits × four locations); Average red measurement data, which is an average value, is calculated (step T4). Then, the red deterioration information generation unit 51R compares the average red measurement data with the red luminance data stored in the data storage unit 52 (step T5). Then, the red measurement circuit RMS calculates the difference between the voltage value indicated by the average red measurement data and the voltage value that achieves the desired luminance, and outputs the calculated voltage value as the degradation information to the source driver 41 (step T6). ).

In addition, the green deterioration information generation unit 51G averages the voltage values indicated by the green measurement data supplied from the respective green measurement circuits GMS (in the present embodiment, an average of three green measurement circuits × four locations), and A certain average green measurement data is calculated (step T4). Then, the green deterioration information generation unit 51G compares the average green measurement data with the green luminance data stored in the data storage unit 52 (step T5). Then, the green degradation information generation unit 51G calculates the difference value between the voltage value indicated by the average green measurement data and the voltage value that achieves the desired luminance, and outputs the calculated voltage value to the source driver 41 as degradation information ( Step T6).

In addition, the blue deterioration information generation unit 51B averages the voltage values indicated by the blue measurement data supplied from the respective blue measurement circuits BMS (in the present embodiment, an average of three blue measurement circuits × four locations), and A certain average blue measurement data is calculated (step T4). Then, the blue deterioration information generation unit 51B compares the average blue measurement data with the blue luminance data stored in the data storage unit 52 (step T5). Then, the blue deterioration information generation unit 51B calculates the difference value between the voltage value indicated by the average blue measurement data and the voltage value that achieves the desired luminance, and outputs the calculated voltage value to the source driver 41 as deterioration information ( Step T6).

Next, based on the deterioration information for each light emission color supplied from the deterioration information generation unit 50, the source driver 41 sets the anodes of all sub-pixels SP and all measurement sub-pixels MSP for each light emission color included in the active area AC. The driving voltage to be supplied to 22 is adjusted for each luminescent color (step T7).

Specifically, based on the deterioration information supplied from the red deterioration information generation unit 51R, the source driver 41 supplies the anodes 22 of all red sub pixels RSP and all red measurement sub pixels RMSP included in the active area AC. Adjustment is performed by raising and shifting the driving voltage for driving by the value indicated by the deterioration information (step T7).
In addition, the source driver 41 is for supplying to all the anodes 22 of the all green sub-pixel GSP and the all-green measurement sub-pixel GMSP included in the active region AC based on the deterioration information supplied from the green deterioration information generation unit 51G. The drive voltage is adjusted by raising and shifting only the value indicated by the deterioration information (step T7).

In addition, the source driver 41 is configured to supply to the respective anodes 22 of the all blue sub-pixels BSP and all blue measurement sub-pixels BMSP included in the active region AC based on the deterioration information supplied from the blue deterioration information generation unit 51B. The drive voltage is adjusted by raising and shifting only the value indicated by the deterioration information (step T7).

Thus, the voltage compensation operation ends (step T8). Here, without completing the voltage compensation operation, the process may return to step T2, change the measurement voltage, and perform the voltage compensation operation again.

(Main effect)
As described above, the display device 2 has the plurality of measurement sub-pixels MSP outside the active area AC and not contributing to the display of the image. The plurality of measurement sub-pixels MSP include a light-emitting layer, an anode 22 provided for each of the plurality of measurement sub-pixels, and a cathode 25 opposite to the anode 22 with the light-emitting layer interposed therebetween. The measurement sub-pixel MSP is connected to each measurement sub-pixel MSP and includes a measurement circuit MC that measures the voltage value of the voltage VF between the anode 22 and the cathode 25.

Thereby, it is possible to monitor the change of the voltage VF between the anode 22 and the cathode 25 which is deteriorated with the passage of time. Therefore, the drive voltage supplied to the anode 22 can be adjusted in accordance with the degree of deterioration of the light emitting element OLED.

The display device 2 further includes a deterioration information generation unit 50 that generates deterioration information indicating a deterioration state of the light emitting layer based on the voltage value measured by the measurement circuit MS. Then, the source driver 41 adjusts the drive voltage to be supplied to each anode 22 based on the deterioration information generated by the deterioration information generation unit 50. Thus, the drive voltage supplied to the anode 22 can be adjusted according to the degree of deterioration of the light emitting layer.

Further, the deterioration information generation unit 50 calculates deterioration information for each emission color of the light emitting layer from the voltage value measured by each measurement circuit MC in the plurality of measurement sub-pixels MSP. Then, the source driver 41 adjusts the drive voltage to be supplied to each anode 22 based on the deterioration information for each luminescent color of the luminescent layer. As a result, even if the degree of deterioration is different for each luminescent color of the light emitting layer, it is possible to adjust the optimum drive voltage for each luminescent color.

Further, in the present embodiment, the deterioration information generation unit 50 measures the voltage values measured by the respective measurement circuits MC in the plurality of measurement sub-pixels MSP (in this embodiment, nine measurement sub-pixels × 4 locations), and the data storage unit. The deterioration information is calculated for each emission color of the light emitting layer by averaging the difference values with the voltage value as the desired luminance stored in 52. Then, the source driver 41 adjusts the drive voltage to be supplied to each sub-pixel SP of the active region AC for each emission color of the emission layer based on the deterioration information for each emission color of the emission layer. Therefore, it is easy to adjust the drive voltage supplied to each sub-pixel SP in the active region AC.

In the display device 2, it is preferable that the measurement sub-pixel MSP is shielded from light so that the light emission of the measurement sub-pixel MSP outside the active region AC is not viewed by the user during the voltage compensation operation.

However, when the voltage compensation operation is performed at the time of activation of the display device, the user does not feel much discomfort even if the light emission of the measurement sub-pixel MSP outside the active region AC is visually recognized by the user. Therefore, when the voltage compensation operation is performed at the time of start of the display device, the measurement sub-pixel MSP may not be shielded from light.

(Modified example of voltage compensation operation)
Further, in step T2 of FIG. 9, the measurement voltage is supplied to each measurement sub-pixel MSP. However, not the measurement voltage but the drive voltage of the image to be displayed in the active area AC may be supplied to each measurement sub-pixel MSP.

In this case, an average voltage of drive voltages of all the display sub-pixels corresponding to the color of the measurement sub-pixel MSP is supplied to the measurement sub-pixel MSP as a drive voltage (step T2). For example, to the red measurement sub-pixel RMP, an average voltage of drive voltages of all the red sub-pixels RSP included in the active region AC is supplied as a drive voltage. Also, to the green measurement sub-pixel GMP, an average voltage of the drive voltages of all the green sub-pixels GSP included in the active region AC is supplied as a drive voltage. In addition, an average voltage of drive voltages of all blue sub-pixels BSP included in the active area AC is supplied to the blue measurement sub-pixel BMP as a drive voltage.

Then, in step T3, each measurement sub-pixel MP outputs the voltage VF between the anode 22 and the cathode 25 as measurement data to the deterioration information generation unit 50 (step T3). Step T4 and subsequent steps are the same as the steps described using FIG.

Thus, the voltage compensation operation can be performed without stopping the image displayed in the active area AC.

Second Embodiment
FIG. 8 is a diagram illustrating an active area and a dummy area of the display device 2 according to the second embodiment. FIG. 10 is a diagram illustrating a flowchart of the voltage compensation operation of the display device 2 according to the second embodiment.

When performing the voltage compensation operation, the display device 2 may virtually divide the active area AC into a plurality of areas, and adjust the drive voltage supplied to each anode 22 for each of the divided areas.

As shown in FIG. 8, when performing the voltage compensation operation, for example, the active region AC is virtually divided into four. The upper left region of the paper is referred to as a first active region AC1, the upper right region is referred to as a second active region AC2, the lower left region is referred to as a third active region AC3, and the lower right region is a fourth active region AC4. It is called.

A measurement area is provided adjacent to each of the divided areas of the active area AC. For example, the first measurement area MA1 is provided adjacent to the first active area AC1, the second measurement area MA2 is provided adjacent to the second active area AC2, and the third measurement is adjacent to the third active area AC3. An area MA3 is provided, and a fourth measurement area MA4 is provided adjacent to the fourth active area AC4.

The number of measurement pixels MPIX provided in each of the first measurement area MA1 to the fourth measurement area MA4 may be only one pixel or may be two or more pixels.

Each of the first measurement area MA1 to the fourth measurement area MA4 has a plurality of measurement sub-pixels MSP. For example, the first measurement area MA1 to the fourth measurement area MA4 each include a red measurement sub-pixel RMSP, a green measurement sub-pixel GMSP, and a blue measurement sub-pixel BMSP.

Note that the number of divisions of the active area AC is not limited to four, and may be divided into three or less, or five or more. However, one or more measurement areas are provided adjacent to each divided area.

When performing the voltage compensation operation, the display device 2 performs the same process from step T1 to T3. The process after step T4 is performed for each of the plurality of divided active areas AC. According to this, the drive voltage supplied to the anode 22 can be adjusted more accurately according to the degree of deterioration of the light emitting element OLED.

After the step T3, the display device 2 performs the following processing in place of the steps T4 to T7, and ends the compensation operation (step T8).

As shown in FIG. 10, after step T3, the degradation information generation unit 50 (the red degradation information generation unit 51R, the green degradation information generation unit 51G, the blue degradation information generation unit 51B) (see FIG. 7) The voltage value indicated by the measurement data supplied from each measurement circuit MC (red measurement circuit RMC, green measurement circuit GMC, blue measurement circuit BMC) in the plurality of measurement sub-pixels MSP included in the first measurement area MA1 adjacent to AC1 Averaging is performed for each luminescent color, and first average measurement data for each luminescent color, which is an average value, is calculated (step T4a). In addition, the deterioration information generation unit 50 (red deterioration information generation unit 51R, green deterioration information generation unit 51G, blue deterioration information generation unit 51B) (see FIG. 7) is provided in the second measurement area MA2 adjacent to the second active area AC2. The voltage values indicated by the measurement data supplied from each of the measurement circuits MC (red measurement circuit RMC, green measurement circuit GMC, blue measurement circuit BMC) in the plurality of measurement subpixels included are averaged for each luminescent color and averaged Second average measurement data for each luminescent color is calculated (step T4b). In addition, the deterioration information generation unit 50 (red deterioration information generation unit 51R, green deterioration information generation unit 51G, blue deterioration information generation unit 51B) (see FIG. 7) is located in the third measurement area MA3 adjacent to the third active area AC3. The voltage values indicated by the measurement data supplied from each of the measurement circuits MC (red measurement circuit RMC, green measurement circuit GMC, blue measurement circuit BMC) in the plurality of measurement subpixels included are averaged for each luminescent color and averaged The third average measurement data for each luminescent color is calculated (step T4c). Further, the deterioration information generation unit 50 (red deterioration information generation unit 51R, green deterioration information generation unit 51G, blue deterioration information generation unit 51B) (see FIG. 7) is located in the fourth measurement area MA4 adjacent to the fourth active area AC4. The voltage values indicated by the measurement data supplied from each of the measurement circuits MC (red measurement circuit RMC, green measurement circuit GMC, blue measurement circuit BMC) in the plurality of measurement subpixels included are averaged for each luminescent color and averaged The fourth average measurement data for each luminescent color is calculated (step T4d).

Next, the deterioration information generation unit 50 (red deterioration information generation unit 51R, green deterioration information generation unit 51G, blue deterioration information generation unit 51B) outputs the first average measurement data and the luminance data stored in the data storage unit 52. Are compared for each luminescent color (step T5a). In addition, the deterioration information generation unit 50 (red deterioration information generation unit 51R, green deterioration information generation unit 51G, blue deterioration information generation unit 51B) includes the second average measurement data and the luminance data stored in the data storage unit 52. Are compared for each luminescent color (step T5b). In addition, the deterioration information generation unit 50 (red deterioration information generation unit 51R, green deterioration information generation unit 51G, blue deterioration information generation unit 51B) includes the third average measurement data and the luminance data stored in the data storage unit 52. Are compared for each luminescent color (step T5c). In addition, the deterioration information generation unit 50 (red deterioration information generation unit 51R, green deterioration information generation unit 51G, blue deterioration information generation unit 51B) includes the fourth average measurement data and the luminance data stored in the data storage unit 52. Are compared for each luminescent color (step T5d).

Next, the deterioration information generation unit 50 (red deterioration information generation unit 51R, green deterioration information generation unit 51G, blue deterioration information generation unit 51B) calculates the voltage value indicated by the first average measurement data and the voltage value that achieves the desired luminance. A difference value is calculated for each luminescent color, and the calculated voltage value is output to the source driver 41 for each luminescent color as first deterioration information (step T6a). In addition, the deterioration information generation unit 50 (red deterioration information generation unit 51R, green deterioration information generation unit 51G, blue deterioration information generation unit 51B) generates a voltage value indicated by the second average measurement data and a voltage value that achieves a desired luminance. A difference value is calculated for each luminescent color, and the calculated voltage value is output to the source driver 41 for each luminescent color as second deterioration information (step T6b). In addition, the deterioration information generation unit 50 (red deterioration information generation unit 51R, green deterioration information generation unit 51G, blue deterioration information generation unit 51B) generates a voltage value indicated by the third average measurement data and a voltage value that achieves a desired luminance. A difference value is calculated for each luminescent color, and the calculated voltage value is output to the source driver 41 for each luminescent color as third deterioration information (step T6c). In addition, the deterioration information generation unit 50 (red deterioration information generation unit 51R, green deterioration information generation unit 51G, blue deterioration information generation unit 51B) generates a voltage value indicated by the fourth average measurement data and a voltage value that achieves a desired luminance. A difference value is calculated for each luminescent color, and the calculated voltage value is output to the source driver 41 for each luminescent color as fourth deterioration information (step T6d).

Next, based on the first deterioration information for each luminescent color supplied from the deterioration information generation unit 50 (red deterioration information generation unit 51R, green deterioration information generation unit 51G, and blue deterioration information generation unit 51B), the source driver 41 The drive voltage to be supplied to each anode 22 of all the sub-pixels SP and all the measurement sub-pixels MSP for each luminescent color included in the first active region AC1 is adjusted for each luminescent color (step T7a). In addition, the source driver 41 is based on the second deterioration information for each luminescent color supplied from the deterioration information generation unit 50 (red deterioration information generation unit 51R, green deterioration information generation unit 51G, blue deterioration information generation unit 51B). The drive voltages to be supplied to all the sub-pixels SP for each light emission color and each anode 22 of all the measurement sub-pixels MSP included in the second active region AC2 are adjusted for each light emission color (step T7b). In addition, the source driver 41 is based on the third deterioration information for each light emission color supplied from the deterioration information generation unit 50 (red deterioration information generation unit 51R, green deterioration information generation unit 51G, blue deterioration information generation unit 51B). The drive voltages to be supplied to all the sub-pixels SP for each light emission color and each anode 22 of all the measurement sub-pixels MSP included in the third active region AC3 are adjusted for each light emission color (step T7c). In addition, the source driver 41 is based on the fourth deterioration information for each luminescent color supplied from the deterioration information generation unit 50 (red deterioration information generation unit 51R, green deterioration information generation unit 51G, blue deterioration information generation unit 51B). The drive voltages to be supplied to all the sub-pixels SP for each light-emission color and each anode 22 of all the measurement sub-pixels MSP included in the fourth active region AC4 are adjusted for each light-emission color (step T7d).

Thus, the voltage compensation operation ends (step T8). Here, without completing the voltage compensation operation, the process may return to step T2, change the measurement voltage, and perform the voltage compensation operation again. Further, the order of steps T4a to T4d is arbitrary and may be processed in parallel, the order of steps T5a to T5d may be arbitrary and may be parallel processing, and the order of steps T6a to T6d is arbitrary and may be processed in parallel The order of steps T7a to T7d is arbitrary and may be processed in parallel.

Third Embodiment
The deterioration degree of the light emitting element included in each sub pixel may be different between the sub pixel at the end of the active region AC and the sub pixel at the center. Therefore, the display device 2 may change the degree of adjusting the drive voltage between the sub-pixels at the end included in the active region AC and the sub-pixels in the center.

The voltage compensation operation in the present embodiment is the same as that of the first embodiment (FIG. 9) in steps T1 to T5. In step T6, the deterioration information generation unit 50 calculates, for each luminescent color, the difference value between the voltage value indicated by the average measurement data and the voltage value that achieves the desired luminance, and further, from the sub-pixel at the end of the active area AC The voltage value calculated so as to increase or decrease the correction amount toward the sub-pixel is output to the source driver 41 for each luminescent color as degradation information (step T6). The subsequent steps T7 to T8 are the same as in the first embodiment (FIG. 9).

According to the above configuration, even if the deterioration degree of the light emitting element is different between the end and the central part of the active region AC, the drive voltage of the light emitting element can be accurately adjusted between the end and the central part of the active region AC. .

[Summary]
The electro-optical elements (electro-optical elements whose luminance and transmittance are controlled by the current) included in the display device according to the present embodiment are not particularly limited. The display device according to the present embodiment includes, for example, an organic EL (Electro Luminescence) display provided with an OLED (Organic Light Emitting Diode) as an electro-optical element, and an inorganic light emitting diode as an electro-optical element Inorganic EL display, a QLED display provided with a QLED (Quantum dot Light Emitting Diode) as an electro-optical element, and the like.

[Aspects]
A display device according to aspect 1 of the present invention includes a plurality of display sub-pixels provided in an active area contributing to the display of an image, and a plurality of measurement sub-pixels outside the active area and not contributing to the display of an image. And the plurality of display sub-pixels are provided with a light-emitting layer, a first electrode provided for each of the plurality of display sub-pixels, and a second electrode disposed opposite to the first electrode with the light-emitting layer interposed therebetween. A plurality of measurement sub-pixels including an electrode, a light emitting layer, a first electrode provided for each of the plurality of measurement sub-pixels, and a first electrode disposed opposite to the first electrode with the light emitting layer interposed therebetween A measurement circuit including two electrodes and measuring a voltage value between the first electrode and the second electrode is connected to each of the plurality of measurement sub-pixels.

In the display device according to aspect 2 of the present invention, according to the aspect 1, the deterioration information generation unit generates the deterioration information indicating the deterioration state of the light emitting layer based on the voltage value measured by the measurement circuit; And a source driver for adjusting a drive voltage which is a voltage value according to the display to be supplied to the first electrodes.

In the display device according to aspect 3 of the present invention, in the aspect 2, the plurality of measurement sub-pixels are provided for each light emission color of the plurality of display sub-pixels, and the deterioration information generation unit The deterioration information is calculated for each light emission color from the voltage value measured by each measurement circuit in the measurement sub-pixel, and the source driver adjusts the drive voltage based on the deterioration information for each light emission color.

In the display device according to aspect 4 of the present invention, in the aspect 3, the average voltage of the drive voltages of all the sub-pixels included in the active region corresponding to the color of the measurement sub-pixel It may be supplied.

In the display device according to aspect 5 of the present invention, in the above aspect 3 or 4, the deterioration information generation unit averages voltage values measured by the respective measurement circuits in the plurality of measurement sub-pixels, and the average is the average value. The degradation information, which is the difference between the measurement data and the voltage value that produces the desired luminance, is calculated for each of the luminescent colors, and the source driver supplies the display sub-pixels in the active area based on the degradation information. The drive voltage for adjusting the light emission color is adjusted for each light emission color.

In the display device according to Aspect 6 of the present invention, in Aspect 3, the active area has a plurality of areas including a first area and a second area, and the plurality of measurement sub-pixels are the first area. , And the deterioration information generation unit is configured to measure each of the measurement circuits in the plurality of measurement sub-pixels adjacent to the first area. The first deterioration information, which is the difference between the first measurement data, which is the average value of the measured voltage values, and the voltage value that produces the desired brightness, is calculated for each of the luminescent colors. Calculating second degradation information, which is a difference value between a second measurement data that is an average value of voltage values measured by each measurement circuit in each of the measurement sub-pixels and a voltage value that achieves a desired luminance, The source driver is based on the first deterioration information. The drive voltage to be supplied to each display sub-pixel in the first area is adjusted for each light emission color, and is supplied to each display sub-pixel in the second area based on the second deterioration information. The drive voltage is adjusted for each of the luminescent colors.

In the display device according to aspect 7 of the present invention, in the aspect 3, the deterioration information generation unit determines the voltage value measured by each measurement circuit in the plurality of measurement sub-pixels to the center from the display sub-pixel at the end. The deterioration information is calculated for each of the luminescent colors such that the correction amount increases or decreases toward the display sub-pixel.

In the display device according to aspect 8 of the present invention, in the above aspects 2 to 7, the plurality of measurement sub-pixels are shielded from light.

In the display device according to aspect 9 of the present invention, in the above aspects 2 to 7, a plurality of dummy sub-pixels that do not contribute to the display of the image are provided adjacent to the active region. The measurement circuit is configured by being provided in the dummy sub-pixel.

In the display device according to aspect 9 of the present invention, in the above aspects 2 to 8, when the display device is activated, the degradation information generation unit generates the degradation information, and the source driver performs the driving based on the degradation information. Adjust the voltage.

In the display device according to aspect 10 of the present invention, in the above aspects 2 to 9, a dummy area is provided around the active area, and the measurement sub-pixel and the measurement circuit are provided in the dummy area. May be

In the display device according to aspect 11 of the present invention, in the above aspects 2 to 10, a bending portion which is an area for bending the display device may be provided between the active region and the measurement sub-pixel .

In the display device according to aspect 12 of the present invention, in the above aspects 2 to 11, the degradation information generation unit generates the degradation information at predetermined time intervals, and the source driver generates the drive voltage based on the degradation information. adjust.

The method of driving a display device according to aspect 13 of the present invention is a method of driving a display device, wherein the display device includes a plurality of display sub-pixels provided in an active region contributing to the display of an image, and the active region And a plurality of measurement sub-pixels that do not contribute to the display of the image, the plurality of display sub-pixels being a light emitting layer, a first electrode provided for each of the plurality of display sub-pixels, and the light emission The plurality of measurement sub-pixels include a light emitting layer, a first electrode provided for each of the plurality of measurement sub-pixels, and a plurality of measurement sub-pixels including a second electrode disposed opposite to the first electrode with a layer interposed therebetween. The first electrode included in the measurement sub-pixel by the respective measurement circuits connected to each of the plurality of measurement sub-pixels including the second electrode arranged to face the first electrode with the light emitting layer interposed therebetween. as well as Characterized by the step of measuring a voltage value between the two electrodes.

In the display device according to aspect 15 of the present invention, in the aspect 14, the step of generating deterioration information indicating the deterioration state of the light emitting layer based on the voltage value measured by the measurement circuit; Adjusting a driving voltage which is a voltage value according to the display to be supplied to each of the first electrodes.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Is also included in the technical scope of the present invention. Furthermore, new technical features can be formed by combining the technical means disclosed in each embodiment.

DESCRIPTION OF SYMBOLS 2 Display device 5 Light emitting element layer 6 Sealing layer 10 Lower surface film 12 Resin layer 15 Semiconductor film 16 18 20 inorganic insulating film 21 flattening film 22 anode (first electrode)
23 banks 25 cathode (second electrode)
26 first inorganic sealing film 27 organic sealing film 28 second inorganic sealing film 39 functional film 41 source driver 42 gate driver 50 deterioration information generation unit 51B blue deterioration information generation unit 51G green deterioration information generation unit 51R red deterioration information generation Data storage unit AC1 first active region AC2 second active region AC3 third active region AC4 fourth active region C1 capacitor GH gate wiring MA1 first measurement region MA2 second measurement region MA3 third measurement region MA4 fourth measurement region SH source wiring T1 to T7 transistor Tr thin layer transistor Vini initialization power supply line

Claims (15)

A plurality of display sub-pixels provided in an active area contributing to the display of an image;
And a plurality of measurement sub-pixels which do not contribute to the display of the image, which are outside the active area
The plurality of display sub-pixels include a light-emitting layer, a first electrode provided for each of the plurality of display sub-pixels, and a second electrode disposed opposite to the first electrode with the light-emitting layer interposed therebetween. ,
The plurality of measurement sub-pixels include a light emitting layer, a first electrode provided for each of the plurality of measurement sub pixels, and a second electrode disposed opposite to the first electrode with the light emitting layer interposed therebetween. ,
A display device characterized in that a measurement circuit for measuring a voltage value between the first electrode and the second electrode is connected to each of the plurality of measurement sub-pixels. A degradation information generation unit that generates degradation information indicating a degradation state of the light emitting layer based on a voltage value measured by the measurement circuit;
The display device according to claim 1, further comprising: a source driver that adjusts a drive voltage that is a voltage value according to the display to be supplied to the first electrodes based on the deterioration information. The plurality of measurement sub-pixels are provided for each emission color of the plurality of display sub-pixels,
The deterioration information generation unit calculates the deterioration information for each of the luminescent colors from the voltage values measured by the measurement circuits in the plurality of measurement sub-pixels,
The display device according to claim 2, wherein the source driver adjusts the drive voltage based on the deterioration information for each of the luminescent colors. The display device according to claim 3, wherein an average voltage of drive voltages of all the sub-pixels included in the active area corresponding to the color of the measurement sub-pixel is supplied to the measurement sub-pixel as a drive voltage. . The deterioration information generation unit averages voltage values measured by each measurement circuit in the plurality of measurement sub-pixels, and deterioration is a difference value between average measurement data as the average value and a voltage value as a desired luminance. Information is calculated for each of the luminescent colors
The said source driver adjusts the said drive voltage for supplying to each display sub-pixel of the said active region for every said luminescent color based on the said degradation information, The said claim 3 or 4 characterized by the above-mentioned. Display device. The active area has a plurality of areas including a first area and a second area,
The plurality of measurement sub-pixels include a plurality of measurement sub-pixels adjacent to the first area and a plurality of measurement sub-pixels adjacent to the second area,
The degradation information generation unit
The first deterioration information, which is the difference between the first measurement data, which is the average value of the voltage values measured by the measurement circuits in the plurality of measurement sub-pixels adjacent to the first region, and the voltage value that achieves the desired luminance Calculated for each luminescent color
The second deterioration information, which is a difference value between the second measurement data, which is the average value of the voltage values measured by each measurement circuit in the plurality of measurement sub-pixels adjacent to the second region, and the voltage value that achieves the desired luminance Calculated for each luminescent color
The above source driver is
Adjusting the drive voltage to be supplied to each display sub-pixel of the first area based on the first deterioration information for each of the luminescent colors;
4. The display device according to claim 3, wherein the drive voltage to be supplied to each display sub-pixel in the second area is adjusted for each of the luminescent colors based on the second deterioration information. The deterioration information generation unit is configured to increase or decrease the correction amount from the display sub-pixel at the end to the display sub-pixel at the center from the voltage value measured by each measurement circuit in the plurality of measurement sub-pixels. The display device according to claim 3, wherein the deterioration information is calculated for each of the luminescent colors so as to become. The display device according to any one of claims 2 to 7, wherein the plurality of measurement sub-pixels are shielded from light. Adjacent to the active area, a plurality of dummy sub-pixels that do not contribute to the display of the image are provided;
The display device according to any one of claims 2 to 7, wherein the measurement sub-pixel is configured by providing the measurement circuit in the dummy sub-pixel. A dummy area is provided around the active area,
The display device according to any one of claims 2 to 9, wherein the measurement sub-pixel and the measurement circuit are provided in the dummy area. The display device according to any one of claims 2 to 10, wherein a bending portion which is a region for bending the display device is provided between the active region and the measurement sub-pixel. . 12. The device according to any one of claims 2 to 11, wherein the deterioration information generation unit generates the deterioration information when the display device is activated, and the source driver adjusts the drive voltage based on the deterioration information. The display device described in the section. 12. The device according to any one of claims 2 to 11, wherein the degradation information generation unit generates the degradation information at predetermined time intervals, and the source driver adjusts the drive voltage based on the degradation information. Display device described. A method of driving a display device,
The display device is
A plurality of display sub-pixels provided in an active area contributing to the display of an image;
And a plurality of measurement sub-pixels which do not contribute to the display of the image, which are outside the active area
The plurality of display sub-pixels include a light-emitting layer, a first electrode provided for each of the plurality of display sub-pixels, and a second electrode disposed opposite to the first electrode with the light-emitting layer interposed therebetween. ,
The plurality of measurement sub-pixels include a light emitting layer, a first electrode provided for each of the plurality of measurement sub pixels, and a second electrode disposed opposite to the first electrode with the light emitting layer interposed therebetween. ,
And measuring the voltage value between the first electrode and the second electrode included in the measurement sub-pixel by each measurement circuit connected to each of the plurality of measurement sub-pixels. How to drive. Generating degradation information indicating a degradation state of the light emitting layer based on a voltage value measured by the measurement circuit;
The drive of the display device according to claim 14, further comprising the step of: adjusting a drive voltage which is a voltage value according to the display to be supplied to the first electrodes based on the deterioration information. Method.

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