KR20200009671A - Light emitting display apparatus - Google Patents

Abstract

The present invention provides a light emitting display apparatus capable of accurately sensing and compensating for characteristic values of driving transistors in pixels and/or characteristic changes of light emitting devices. According to an embodiment of the present invention, the light emitting display apparatus comprises: a substrate having an active region and an inactive region surrounding the active region; a plurality of display pixels which are arranged on the active region and have a pixel circuit including driving transistors and light emitting devices electrically connected to the driving transistors; and a plurality of dummy pixels which are arranged on the inactive region and have a dummy pixel circuit including dummy driving transistors and dummy light emitting devices electrically connected to or electrically separated from the dummy driving transistors. The plurality of dummy pixels are grouped into a first and a second dummy pixel group. Dummy pixels of the first dummy pixel group between the first and the second dummy pixel group include a color filter layer overlapped with the dummy light emitting devices.

Description

Light emitting display device {LIGHT EMITTING DISPLAY APPARATUS}

The present application relates to a light emitting display device.

The light emitting display device has a high response speed, low power consumption, and unlike the liquid crystal display device, since the light emitting device does not require a separate light source, there is no problem in viewing angle, and thus, the light emitting display device has attracted attention as a next-generation flat panel display device.

Each of the pixels constituting the light emitting display device may include a light emitting device including a light emitting layer interposed between an anode electrode and a cathode electrode, and a pixel circuit driving the light emitting device. The pixel circuit may mainly include a switching thin film transistor, a driving transistor, and a storage capacitor.

In the light emitting display device, luminance deviation occurs between pixels for the same data signal due to variation in characteristics of the driving transistor between pixels due to process variations (such as threshold voltage and mobility) and deterioration due to an increase in driving time. In addition, the degradation of the light emitting device of the pixel is accelerated as the driving time is increased, and the luminance deviation is generated between the pixels for the same data signal due to the deterioration variation (or characteristic variation) of the light emitting device for each pixel. The characteristic variation between the pixels due to the characteristic variation between the driving transistors and the characteristic variation between the light emitting elements may cause luminance deviation between pixels, resulting in screen abnormalities such as afterimages or deterioration in image quality or luminance unevenness.

Recently, an external compensation method capable of compensating for the characteristic deviation between pixels has been proposed. The external compensation method senses a characteristic value of a driving transistor and / or a light emitting element of each pixel through sensing driving of the light emitting display device, and then based on the characteristic value sensed by the sensing driving during display driving of the light emitting display device. It may be done in a manner to compensate for data to be applied to.

However, since the sensing value of each pixel during the sensing driving of the light emitting display device is mixed with the temperature at the time of sensing and the time-dependent change due to the driving, the characteristic value of the driving transistor and / or the characteristic value of the light emitting device in each pixel are accurately sensed. There is a difficulty in compensating correctly.

SUMMARY The present application provides a light emitting display device capable of accurately sensing and compensating for a characteristic value of a driving transistor in a pixel and / or a characteristic change of a light emitting device.

A light emitting display device according to an example of the present application has a plurality of substrates having an active region and an inactive region surrounding the active region, a pixel circuit disposed in the active region, including a driving transistor, and a light emitting element electrically connected to the driving transistor. And a plurality of dummy pixels having a display pixel, and a dummy pixel circuit disposed in an inactive region and including a dummy driving transistor, and a dummy light emitting element electrically connected to or electrically separated from the dummy driving transistor, wherein the plurality of dummy pixels include a plurality of dummy pixels. The dummy pixels of the first dummy pixel group and the second dummy pixel group, which are grouped into the first dummy pixel group and the second dummy pixel group, may further include a color filter layer overlapping the dummy light emitting device.

The present application may accurately compensate for the characteristic value of the driving transistor in the pixel and / or the characteristic change of the light emitting device.

In addition to the effects of the present application mentioned above, other features and advantages of the present application will be described below, or will be clearly understood by those skilled in the art from such description and description.

1 is a diagram illustrating a light emitting display device according to an example of the present application.
FIG. 2 is a circuit diagram illustrating the display pixel illustrated in FIG. 1.
3 is a circuit diagram illustrating the dummy pixel illustrated in FIG. 1.
4 is a cross-sectional view illustrating first to third display pixels according to an example of the present application.
5 is a cross-sectional view illustrating a fourth display pixel according to an example of the present application.
6 and 7 are diagrams illustrating a dummy pixel column according to an example shown in FIG. 1.
8A is a cross-sectional view illustrating a dummy pixel according to another example included in the first dummy pixel group illustrated in FIG. 6.
8B is a cross-sectional view illustrating a dummy pixel according to another example included in the second dummy pixel group illustrated in FIG. 6.
9 is a diagram illustrating a dummy pixel column according to another example illustrated in FIG. 1.
FIG. 10 is a cross-sectional view illustrating dummy pixels of the first dummy pixel group illustrated in FIG. 9.
11 is a diagram for describing an arrangement structure of dummy pixels according to another example of the present application.
FIG. 12 is a diagram illustrating an arrangement structure of a dummy pixel illustrated in FIG. 11.
13 is a diagram illustrating a temperature distribution of a display panel when the display panel is driven in the light emitting display device according to an example of the present application.
14 is a diagram for describing an arrangement structure of a dummy pixel according to another example of the present application.
FIG. 15 is a diagram illustrating an arrangement structure of the dummy pixel illustrated in FIG. 14.
16A is a graph for explaining changes in temperature with respect to the mobility of a driving transistor in a display pixel in a comparative example.
FIG. 16B is a graph for explaining a change in temperature with respect to the mobility of a driving transistor in a display pixel in an example of the present application.

Advantages and features of the present application, and a method of achieving them will be apparent with reference to the examples described below in detail in conjunction with the accompanying drawings. However, the present application is not limited to the examples disclosed below, but may be implemented in various forms, and only one example of the present application is intended to complete the disclosure of the present application, and is commonly used in the art to which the present invention belongs. It is provided to fully inform those skilled in the art of the scope of the invention, and the invention of the present application is defined only by the scope of the claims.

Shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the example of the present application are exemplary, and thus the present application is not limited to the illustrated items. Like reference numerals refer to like elements throughout. In addition, in describing the example of the present application, when it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present application, the detailed description thereof will be omitted.

In the case where 'comprises', 'haves', 'consists of' and the like mentioned in the present specification are used, other parts may be added unless 'only' is used. In the case where the component is expressed in the singular, the plural includes the plural unless specifically stated otherwise.

In interpreting a component, it is interpreted to include an error range even if there is no separate description.

In the case of the description of the positional relationship, for example, if the positional relationship of the two parts is described as 'on', 'upper', 'lower', 'next to', etc. Alternatively, one or more other parts may be located between the two parts unless 'direct' is used.

In the case of a description of a temporal relationship, for example, if the temporal after-term relationship is described as 'after', 'following', 'after', 'before', or the like, 'directly' or 'direct' This may include cases that are not continuous unless used.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are only used to distinguish one component from another. Therefore, the first component mentioned below may be a second component within the technical spirit of the present application.

The term "at least one" should be understood to include all combinations which can be presented from one or more related items. For example, the meaning of "at least one of the first item, the second item, and the third item" means two items of the first item, the second item, or the third item, as well as two of the first item, the second item, and the third item, respectively. It can mean a combination of all items that can be presented from more than one.

Each of the features of the various examples of the present application may be combined or combined with each other, partly or wholly, and technically various interlocking and driving are possible, and each of the examples may be independently implemented with respect to each other or may be implemented in association with each other. .

Hereinafter, an example of a light emitting display device according to the present application will be described in detail with reference to the accompanying drawings. In adding reference numerals to components of each drawing, the same components may have the same reference numerals as much as possible even though they are shown in different drawings.

1 is a diagram illustrating a light emitting display device according to an example of the present application, FIG. 2 is a circuit diagram illustrating a display pixel illustrated in FIG. 1, and FIG. 3 is a circuit diagram illustrating a dummy pixel illustrated in FIG. 1.

1 to 3, a light emitting display device according to an example of the present application may include a display panel 10 and a panel driving circuit unit 30.

The display panel 10 may include an active area AA, an inactive area IA, a plurality of display pixels P, and a plurality of dummy pixels DP.

The active area AA is provided in the middle area of the substrate and may be defined as a display area displaying an image.

The active area AA according to an example may include a plurality of data lines DL, a plurality of gate lines GL, a plurality of sensing lines SL, and a plurality of pixel areas.

Each of the plurality of data lines DL extends along a first direction and is spaced apart from each other along a second direction crossing the first direction.

Each of the plurality of gate lines GL extends along a second direction and is spaced apart from each other along the first direction.

Each of the plurality of sensing lines SL extends along the first direction and is spaced apart from each other along the second direction.

Each of the plurality of pixel areas may be provided by an intersection of two gate lines adjacent in a first direction and a data line DL and a sensing line SL in a second direction.

The inactive area IA is provided at an edge area of the substrate to surround the active area AA, and may be defined as a non-display area in which an image is not displayed. The non-active area IA according to an example may include a first non-active area IA1 defined at a first edge of the substrate and a second non-active area IA2 defined at a second edge of the substrate parallel to the first non-active area IA1. It may include a third inactive region (IA3) defined at the third edge of the substrate, and a fourth inactive region (IA4) defined at the fourth edge of the substrate parallel to the third inactive region. For example, the first non-active area IA1 is the upper (or lower) edge area of the display panel 10, and the second non-active area IA2 is the lower (or upper) edge area of the display panel 10, the third The non-active area IA3 may be a left (or right) edge area of the display panel 10, and the fourth non-active area IA4 may be a right (or left) edge area of the display panel 10, but is not limited thereto. Do not.

Each of the plurality of display pixels P is provided for each pixel area defined in the active area AA. Each of the plurality of display pixels P corresponds to a difference voltage between a data voltage supplied from an adjacent data line DL and a reference voltage supplied from an adjacent sensing line SL in response to a gate signal supplied from an adjacent gate line GL. The image is displayed by emitting light according to the corresponding data current.

Each of the plurality of display pixels P may be one of a red pixel, a green pixel, a blue pixel, and a white pixel. For example, the first to fourth display pixels disposed along the length direction of the gate line GL (or the data line DL) may constitute a unit pixel displaying one image. The pixel may be a red pixel, the second display pixel is a green pixel, the third display pixel is a blue pixel, and the fourth display pixel is a white pixel, but is not limited thereto.

Each of the display pixels P according to an example may include a light emitting device ED and a pixel circuit PC.

The light emitting device ED emits light by a data current supplied from the pixel circuit PC to emit light having a brightness corresponding to the data current. The light emitting device ED according to an example may include a first electrode (or anode) electrically connected to the pixel circuit PC, a light emitting layer formed on the first electrode, and a second electrode (or cathode electrode) electrically connected to the light emitting layer. It may include. The light emitting layer may include any one of an organic light emitting layer, an inorganic light emitting layer, and a quantum dot light emitting layer, or may include a stacked or mixed structure of an organic light emitting layer (or an inorganic light emitting layer) and a quantum dot light emitting layer. The light emitting device ED may further include a functional layer for improving light emission efficiency and / or lifespan of the light emitting layer.

The pixel circuit PC corresponds to a difference voltage between a data voltage supplied from an adjacent data line DL and a reference voltage supplied from an adjacent sensing line SL in response to a gate signal supplied from an adjacent gate line GL. The data current is provided to the light emitting device ED. The pixel circuit PC according to an example may include a first switching transistor Tsw1, a second switching transistor Tsw2, a driving transistor Tdr, and a storage capacitor Cst. The transistors Tsw1, Tsw2, and Tdr of the pixel circuit PC may be formed of a thin film transistor TFT, and at least one of the transistors Tsw1, Tsw2, and Tdr may be an a-Si TFT, a poly-Si TFT, or an oxide. TFT, or Organic TFT.

The first switching transistor Tsw1 is a gate electrode connected to the first gate line GLa, a first electrode connected to the adjacent data line DL, and a first node n1 which is a gate electrode of the driving transistor Tdr. It includes a second electrode connected to). The first switching transistor Tsw1 receives the data voltage supplied from the adjacent data line DL according to the first gate signal supplied to the first gate line Gla, that is, the first node n1, that is, the driving transistor Tdr. Is supplied to the gate electrode.

The second switching transistor Tsw2 includes a gate electrode connected to the second gate line GLb, a first electrode connected to the second node n2 that is a source electrode of the driving transistor Tdr, and an adjacent sensing line SL. It includes a second electrode connected to). The second switching transistor Tsw2 receives the reference voltage supplied to the sensing line SL adjacent to the second node n2, that is, the driving transistor Tdr according to the second gate signal supplied to the second gate line GLb. Is supplied to the source electrode.

The storage capacitor Cst is formed between the gate electrode and the source electrode of the driving transistor Tdr. The storage capacitor Cst according to an example may include a first capacitor electrode connected to a gate electrode of the driving transistor Tdr, a second capacitor electrode connected to a source electrode of the driving transistor Tdr, and a first capacitor electrode and a second capacitor electrode. It may include a dielectric layer formed in the overlap region of. The storage capacitor Cst charges the difference voltage between the gate electrode and the source electrode of the driving transistor Tdr, and then switches the driving transistor Tdr according to the charged voltage.

The driving transistor Tdr is a gate electrode commonly connected to the second electrode of the first switching transistor Tsw1 and the first capacitor electrode of the storage capacitor Cst, and the first electrode and the storage of the second switching transistor Tsw2. A source electrode commonly connected to the second electrode of the capacitor Cst and the first electrode of the light emitting device ED, and a drain electrode connected to the pixel driving power supply EVDD. The driving transistor Tdr is turned on by the voltage of the storage capacitor Cst to control the amount of current flowing from the pixel driving power supply EVDD to the light emitting device ED.

The driving transistor Tdr of each of the plurality of display pixels P has characteristic values such as threshold voltage and mobility, and the characteristic value of the driving transistor Tdr is the driving transistor Tdr. May change due to deterioration with temperature and / or drive time. The light emitting devices ED of the plurality of display pixels P have characteristic values such as threshold voltages and capacitances, and the characteristic values of the light emitting devices ED also depend on the driving time and / or temperature of the light emitting devices ED. May change due to deterioration. Accordingly, the display panel 10 may display the display pixel P according to the characteristic value deviation between the driving transistors Tdr of each display pixel P as well as the characteristic value deviation between the light emitting elements ED of each display pixel P. Image quality may be degraded due to the luminance deviation between them.

Each of the plurality of dummy pixels DP is provided in the inactive region IA and is disposed at an outer portion of the active region IA. Each of the plurality of dummy pixels DP may be disposed in at least one of the first to fourth inactive regions IA1, IA2, IA3, and IA4 of the inactive region IA. Each of the plurality of dummy pixels DP according to the present example may be disposed in the dummy pixel column 101 provided in the fourth non-active area IA4.

Each of the dummy pixels DP according to an example may include a dummy light emitting device ED ′ and a dummy pixel circuit PC ′.

The dummy light emitting device ED ′ is electrically connected to the dummy pixel circuit PC ′ and is non-emitted by a non-emitting current supplied from the dummy pixel circuit PC ′. Here, the non-emitting current may be set to a current value corresponding to the black gradation. Since the dummy light emitting device ED ′ has a structure substantially the same as the light emitting device ED of the display pixel P, the drawings and description thereof will be omitted.

The dummy pixel circuit PC ′ may have a difference between a non-emitting data voltage supplied from an adjacent data line DL and a reference voltage supplied from an adjacent sensing line SL in response to a gate signal supplied from an adjacent gate line GL. The non-emission data current corresponding to the voltage is provided to the dummy light emitting device ED '. The dummy pixel circuit PC 'according to an example may be a dummy driving transistor Tdr' electrically connected to the first dummy switching transistor Tsw1 ', the second dummy switching transistor Tsw2', and the dummy light emitting device ED '. , And a dummy storage capacitor Cst '. Since the dummy pixel circuit PC 'has substantially the same configuration as the pixel circuit PC of the display pixel P, the drawings and description thereof will be omitted.

As described above, each of the dummy driving transistors Tdr 'of the plurality of dummy pixels DP has characteristic values such as threshold voltage and mobility. However, since the dummy driving transistor Tdr 'is not driven by the non-emission data voltage (or black voltage), the characteristic value of the dummy driving transistor Tdr' is driven differently from the driving transistor Tdr of the display pixel P. It does not change over time. However, the characteristic value of the dummy driving transistor Tdr 'may be changed only by temperature or external light.

The dummy light emitting device ED ′ of each of the plurality of dummy pixels DP has characteristic values such as a threshold voltage and a capacitance Ced. However, since the dummy light emitting device ED 'does not emit light by the non-emission data current, the characteristic value of the dummy light emitting device ED' does not change depending on the driving time, unlike the light emitting device ED of the display pixel P. Do not. However, the characteristic value of the dummy light emitting device ED ′ may be changed only by temperature or external light.

The panel driving circuit unit 30 may drive the display panel 10 in a display mode and a sensing mode. In the display driving of the display panel 10 according to the display mode, the panel driving circuit unit 30 emits light emitting elements ED of each of the plurality of display pixels P, and at the same time, the dummy of each of the plurality of dummy pixels DP. The light emitting element ED 'is not emitted. In this case, the panel driving circuit unit 30 may supply the non-emission data voltage (or black data voltage) to the plurality of dummy pixels DP in the display mode of the display panel 10. In the sensing driving of the display panel 10 according to the sensing mode, the panel driving circuit unit 30 may provide a characteristic value of each of the plurality of display pixels P and a plurality of dummy pixels through each of the plurality of sensing lines SL. The characteristic value of DP) is sensed, and based on this, the pixel data to be supplied to each display pixel P is corrected.

The panel driving circuit unit 30 according to an example may include a gate driving circuit 310, a data driving circuit 330, a timing control circuit 350, and a storage circuit (or a memory circuit) 370.

The gate driving circuit 310 is provided in the inactive region IA of the display panel 10 and electrically connected to the plurality of gate lines GL provided in the active region AA of the display panel 10. The gate driving circuit 310 generates a gate signal in a predetermined order in response to the gate control signal GS of the timing control circuit 350 and supplies the gate signal to a corresponding gate line GL.

According to an example, the gate driving circuit 310 may be integrated in the third inactive region IA3 or the fourth inactive region IA4 of the substrate in one-to-one correspondence with the plurality of gate lines GL according to the manufacturing process of the thin film transistor. Can be connected. According to another example, the gate driving circuit 310 may be configured as an integrated circuit and may be mounted (or bonded) to the third inactive region IA3 and / or the fourth inactive region IA4 of the substrate, or may be mounted on a flexible circuit film. The gate line GL may be connected one-to-one.

The data driving circuit 330 is electrically connected to one end of each of the plurality of data lines DL and the plurality of sensing lines SL provided in the active area AA through the pad part provided in the first non-active area IA1 of the substrate. Connected. The data driving circuit 330 receives the pixel data Pdata and the data control signal DCS provided from the timing control circuit 350, and receives a plurality of reference gamma voltages provided from the power supply circuit.

The data driving circuit 330 converts the pixel data Pdata into a data voltage by using the data control signal DCS and the plurality of reference gamma voltages during display driving, and corresponding pixels through the corresponding data line DL. Supply to (P, DP). In this case, the data driving circuit 330 may supply the actual data voltages to the plurality of display pixels P in display driving, and may supply the non-emitting data voltages (or black data voltages) to the plurality of dummy pixels DP, respectively. have.

In the sensing driving, the data driving circuit 330 converts the sensing pixel data Pdata into a sensing data voltage and supplies the pixel data Pdata to the corresponding pixels P and DP through a corresponding data line DL. The respective characteristic values of the corresponding display pixels P and the dummy pixels DP are sensed through each of the sensing lines SL, and the sensed pixel-specific sensing data Sdata is provided to the timing control circuit 350. The characteristic values of each of the display pixel P and the dummy pixel DP may be the threshold voltage or mobility of the driving transistor Tdr, the threshold voltage of the light emitting device ED, or the capacitance Ced.

The timing control circuit 350 may include a gate control signal GCS for controlling the gate driving circuit 310 based on a timing synchronization signal TSS input from an external device, that is, a system main body (or a host system) or a graphics card. Each data control signal DCS for controlling the data driving circuit 330 is generated.

The timing control circuit 350 converts red, green, and blue input data Idata input from the outside into four color data of red, green, blue, and white so as to correspond to the pixel arrangement structure of the display panel 10. 4 color data is corrected to pixel data Pdata based on the sensing data Sdata stored in the storage circuit 370 and provided to the data driving circuit 330. For example, the timing control circuit 350 may input red, green, and blue input data Idata according to the data conversion method disclosed in Korean Patent Laid-Open Publication No. 10-2013-0060476 or 10-2013-0030598. The data can be converted into four colors of red, green, blue, and white colors.

The timing control circuit 350 drives the gate driving circuit 310 and the data driving circuit 330 in the display mode, and operates the gate driving circuit 310 and the data driving circuit 330 during the user's setting or the set compensation period. Run in sensing mode. In the sensing mode, the inspection process before shipment of the light emitting display device, the initial initial driving of the display panel 10, the power on of the light emitting display device, and the power off of the light emitting display device. When the display panel 10 is powered off after prolonged driving of the display panel 10, the display panel 10 may be performed in a blank period of a frame set in real time or periodically.

The timing control circuit 350 stores the pixel-specific sensing data Sdata provided from the data driving circuit 330 in the storage circuit 370 according to the sensing mode. In the display mode, the timing control circuit 350 corrects the pixel data to be supplied to each display pixel P based on the sensing data Sdata stored in the storage circuit 370 and provides the data driving circuit 330 to the data driving circuit 330. do. Here, the pixel-specific sensing data Sdata includes not only changes over time of the driving transistor and the light emitting device but also changes with temperature. Accordingly, in the sensing driving, the timing control circuit 350 senses characteristic values of each of the dummy driving transistor Tdr 'and / or the dummy light emitting device ED' including only the temperature change except for the change over time. By correcting the pixel data to be supplied to each display pixel P based on the characteristic value of the driving transistor and / or the characteristic change of the light emitting device in the display pixel P according to the temperature change without the need of a separate temperature sensor, the pixel ( Compensate effectively for the characteristic change of P).

The timing control circuit 350 according to an example predicts temperature information of the display panel 10 based on current sensing data Sdata of each of the plurality of dummy pixels DP provided from the data driving circuit 330. A temperature compensation gain value may be calculated according to the predicted temperature information. For example, the timing control circuit 350 may include the first sensing data or the previous sensing data Sdata for each dummy pixel stored in the storage circuit 370 and the current sensing data for each dummy pixel provided from the data driving circuit 330. The temperature compensation gain value can be calculated based on the data deviation between Sdata). At this time, the timing control circuit 350 is a temperature compensation gain value corresponding to a data deviation between the previous sensing data Sdata and the current sensing data Sdata for each dummy pixel in the temperature compensation lookup table stored in the storage circuit 370. Can be extracted.

Since the luminance (or current) of the pixel has a characteristic of increasing in proportion to the temperature, the temperature compensation gain value mapped to the temperature compensation lookup table is set to a value capable of suppressing (or removing) the luminance change with temperature. . As an example, the timing control circuit 350 may calculate a temperature compensation gain value corresponding to an average value or a maximum value of the data deviation between the previous sensing data Sdata and the current sensing data Sdata for each dummy pixel. Here, the temperature compensation gain value may be set to a value between 1.0 and 2.0, but is not limited thereto.

According to an embodiment, the temperature compensation gain value may be a first temperature compensation gain value calculated based on previous sensing data Sdata and current sensing data Sdata of the threshold voltage of the dummy driving transistor Tdr 'in the dummy pixel DP. A second temperature compensation gain value calculated according to the previous sensing data Sdata and the current sensing data Sdata of the mobility of the dummy driving transistor Tdr 'in the dummy pixel DP, and a dummy in the dummy pixel DP. The third temperature compensation gain value calculated according to the previous sensing data Sdata and the current sensing data Sdata for the threshold voltage of the light emitting device ED ', and the dummy light emitting device ED' in the dummy pixel DP. And at least one of a fourth temperature compensation gain value calculated according to the previous sensing data Sdata and the current sensing data Sdata for the capacitance.

The timing control circuit 350 according to an exemplary embodiment may include a current sensing data Sdata for each display pixel provided from the data driving circuit 330 and previous sensing data Sdata for each display pixel stored in the storage circuit 370 corresponding thereto. After calculating the deviation data for each display pixel and calculating the data compensation value for each display pixel by reflecting the temperature compensation gain value in the deviation data for the display pixel, the corresponding display pixel P according to the calculated data compensation value for each display pixel The pixel data Pdata supplied to the data is corrected and provided to the data driving circuit 330. The timing control circuit 350 stores the calculated data compensation value for each display pixel in the storage circuit 370 to update the data compensation value for each pixel.

The data compensation value may include at least one of a compensation gain value, a compensation offset, a degradation offset, and a degradation gain value. The compensation gain value is a parameter related to mobility compensation of the driving transistor Tdr in the display pixel P, the compensation offset is a parameter related to threshold voltage compensation of the driving transistor Tdr in the display pixel P, and the degradation offset is a display pixel. The parameter related to the threshold voltage compensation and the deterioration gain value of the light emitting device ED in (P) may be a parameter related to the capacitance compensation of the light emitting device ED in the display pixel P.

As an example, the timing control circuit 350 is stored in the current sensing data Sdata of the mobility of the driving transistor Tdr for each display pixel provided from the data driving circuit 330 and the storage circuit 370 corresponding thereto. The mobility deviation data between the previous sensing data Sdata may be calculated, and the compensation gain value for each display pixel may be calculated by reflecting the second temperature compensation gain value in the calculated deviation data for each display pixel. In addition, the timing control circuit 350 performs current sensing data Sdata on the threshold voltage of the driving transistor Tdr for each display pixel provided from the data driving circuit 330 and previous sensing stored in the storage circuit 370 corresponding thereto. The threshold voltage deviation data between the data Sdata may be calculated, and the compensation offset for each display pixel may be calculated by reflecting the first temperature compensation gain value in the calculated deviation data for each display pixel. Then, the timing control circuit 350 corrects the pixel data Pdata to be supplied to the corresponding display pixel P according to the compensation offset and the compensation gain value for each display pixel, and provides the same to the data driving circuit 330. Here, the timing control circuit 350 multiplies the display data pixel data Pdata by the display pixel compensation gain value and adds the display pixel compensation offset to the result of the multiplication. ) Can be corrected.

As another example, the timing control circuit 350 may compensate the horizontal line-specific temperature corresponding to the data deviation between the previous sensing data Sdata and the current sensing data Sdata for each dummy pixel disposed in each horizontal line of the display panel 10. The gain value can be calculated. In this case, the timing control circuit 350 may compensate the sensing data Sdata for each display pixel in units of horizontal lines of the display panel 10 based on the temperature compensation gain value for each horizontal line.

Meanwhile, the panel driving circuit unit 30 according to the present application may display the display pixel through the sensing mode disclosed in Korean Patent Laid-Open Publication Nos. 10-2016-0093179, 10-2017-0054654, or 10-2018-0002099. A characteristic value of each of P and the dummy pixel DP may be sensed, and thus a description of a method of sensing the characteristic value of each of the display pixel P and the dummy pixel DP will be omitted.

4 is a cross-sectional view illustrating first to third display pixels according to an example of the present application.

Referring to FIG. 4 and FIG. 2, the first to third display pixels Pr / Rg / Rb according to the example of the present application may include a circuit area CA and an opening provided in a pixel area defined on the substrate 100. The area OA may be included.

The substrate 100 is mainly made of a glass material, but may be made of a transparent plastic material that can be bent or bent, for example, a polyimide material. The entire front surface of the substrate 100 may be covered by one or more buffer layers 110.

The buffer layer 110 serves to block diffusion of the material contained in the substrate 100 into the transistor layer during the high temperature process of the thin film transistor manufacturing process. In addition, the buffer layer 110 may also serve to prevent external moisture or moisture from penetrating into the light emitting device.

The circuit area CA includes a transistor layer, a protection layer 130, and an overcoat layer 170.

The transistor layer includes a pixel circuit PC having a driving transistor Tdr.

The driving transistor Tdr according to an example includes an active layer 111, a gate insulating layer 113, a gate electrode 115, an interlayer insulating layer 117, a drain electrode 119d, and a source electrode 119s.

The active layer 111 includes a channel region 111c, a drain region 111d, and a source region 111s formed in the driving transistor region of the circuit region CA defined on the substrate 100 or the buffer layer 110. do. In other words, the active layer 111 is a drain region 111d and a source region 111s that are conductive by an etching gas during the etching process of the gate insulating film 113, and a channel region 111c that is not conductive by an etching gas. It includes. In this case, the drain region 111d and the source region 111s may be spaced apart from each other with the channel region 111c interposed therebetween.

The active layer 111 according to an example may be formed of a semiconductor material made of any one of amorphous silicon, polycrystalline silicon, oxide, and organic material, but is not limited thereto. .

The gate insulating layer 113 is formed on the channel region 111c of the active layer 111. The gate insulating layer 113 is not formed on the entire surface of the substrate 100 or the buffer layer 110 including the active layer 111 and is formed only on the channel region 111c of the active layer 111. It can be formed as.

The gate electrode 115 is formed on the gate insulating layer 113 to overlap the channel region 111c of the active layer 111. The gate electrode 115 serves as a mask to prevent the channel region 111c of the active layer 111 from being conductive by the etching gas during the patterning process of the gate insulating layer 113 using the etching process.

The interlayer insulating layer 117 is formed on the drain region 111d and the source region 111s of the gate electrode 115 and the active layer 111. That is, the interlayer insulating layer 117 is formed on the entire surface of the substrate 100 or the buffer layer 110 to form the drain region 111d and the source region 111s of the gate electrode 115 and the active layer 111. Cover.

The drain electrode 119d is electrically connected to the drain region 111d of the active layer 111 through a first contact hole provided in the interlayer insulating layer 117 overlapping the drain region 111d of the active layer 111. .

The source electrode 119s is electrically connected to the source region 111s of the active layer 111 through a second contact hole provided in the interlayer insulating layer 117 overlapping the source region 111s of the active layer 111. .

Each of the drain electrode 119d and the source electrode 111s may be made of the same metal material.

In addition, the circuit area CA further includes a first switching transistor Tsw1, a second switching transistor Tsw2, and a storage capacitor Cst.

Since the first switching transistor Tsw1 and the second switching transistor Tsw2 are provided on the circuit area CA to have the same structure as the driving transistor Tdr, a description thereof will be omitted.

The storage capacitor Cst is provided in an overlapping region between the gate electrode 115 and the source electrode 119s of the driving transistor Tdr overlapping each other with the interlayer insulating layer 117 therebetween.

In addition, the transistor provided in the circuit area CA may have a characteristic in which a threshold voltage is shifted by light. In order to prevent this, the light emitting display device according to the present application may include light blocking provided under the active layer 111. It may further comprise a layer (LSL).

The light blocking layer LSL is provided between the substrate 100 and the active layer 111 to block light incident to the active layer 111 through the substrate 100 to minimize the change in the threshold voltage of the transistor due to external light. prevent. The light blocking layer LSL is covered by the buffer layer 110. Optionally, the light blocking layer LSL may be electrically connected to the source electrode of the transistor to serve as a lower gate electrode of the transistor. In this case, the threshold voltage of the transistor may be changed depending on the bias voltage as well as the characteristic change due to light. Minimize or prevent.

The protective layer 130 is provided on the substrate 100 to cover the transistor layer. That is, the protective layer 130 covers the drain electrode 119d, the source electrode 119s, and the interlayer insulating layer 117 of the driving transistor Tdr. Optionally, the protective layer 130 may be expressed in terms of a passivation layer.

The overcoat layer 170 is provided on the substrate 100 to cover the protective layer 130. The overcoat layer 170 is formed to have a relatively thick thickness and serves to provide a flat surface on the substrate 100.

The opening area OA may include a light emitting device ED and a color filter layer 150.

The light emitting device ED emits light toward the substrate 100 according to a bottom emission method. The light emitting device ED according to an example includes a first electrode E1, a light emitting layer EL, and a second electrode E2.

The first electrode E1 is formed on the overcoat layer 170 on the pixel area PA and is electrically connected to the source electrode 119s of the driving transistor Tdr. In this case, one end of the first electrode E1 adjacent to the circuit area CA extends over the source electrode 119s of the driving transistor Tdr and includes a contact hole provided in the overcoat layer 170 and the protection layer 130. It is electrically connected to the source electrode 119s of the driving transistor Tdr through CH.

The first electrode E1 may be an anode of the light emitting device ED. The first electrode E1 according to an example may include a transparent conductive material such as transparent conductive oxide (TCO) so that light emitted from the emission layer EL may be transmitted toward the substrate 100.

The emission layer EL is formed on the first electrode E1 to directly contact the first electrode E1. The light emitting layer EL according to an example includes two or more light emitting parts for emitting white light. For example, the light emitting layer EL may include a first light emitting part and a second light emitting part for emitting white light by mixing the first light and the second light. Here, the first light emitting unit emits the first light and may include any one of a blue light emitting unit, a green light emitting unit, a red light emitting unit, a yellow light emitting unit, and an yellow green light emitting unit. The second light emitting unit may include a blue light emitting unit, a green light emitting unit, a red light emitting unit, a yellow light emitting unit, and a light emitting unit which emits light having a complementary color relationship among the first light among yellow green.

The second electrode E2 is formed on the light emitting layer EL to directly contact the light emitting layer EL. The second electrode E2 according to an example may be a cathode of the light emitting device ED. According to an embodiment, the second electrode E2 may include a metal material having a high reflectance in order to reflect light emitted and emitted from the emission layer EL toward the substrate 100.

The color filter layer 150 may be provided between the substrate 100 and the overcoat layer 170 so as to overlap the light emitting device ED (or the opening area OA).

The color filter layer 150 according to an example is provided on the passivation layer 130 to overlap the opening area OA. That is, the color filter layer 150 may be formed on the passivation layer 130 so as to overlap the opening area OA and may be covered by the overcoat layer 170.

The color filter layer 150 according to another example may be provided between the interlayer insulating layer 117 and the protection layer 130 or may be provided between the substrate 100 and the interlayer insulating layer 117 to overlap the opening region OA.

The color filter layer 150 according to an example includes a color filter that transmits only a wavelength of a color set in a pixel among light emitted from the light emitting device ED toward the substrate 100. For example, the color filter layer 150 may transmit only red, green, or blue wavelengths. As an example, the color filter layer 150 provided in the first display pixel Pr may be a red color filter, the color filter layer 150 provided in the second display pixel Pg may be a green color filter, and the third display pixel Pb. The color filter layer 150 provided in each may include a blue color filter.

In addition, the color filter layer 150 may emit light of a color set in a pixel by re-emission according to light emitted from the light emitting device ED toward the substrate 100 in order to realize high color reproducibility of the light emitting display device. It may include a quantum dot having. Here, the quantum dot may be selected from CdS, CdSe, CdTe, ZnS, ZnSe, GaAs, GaP, GaAs-P, Ga-Sb, InAs, InP, InSb, AlAs, AlP, AlSb, and the like. For example, the color filter layer 150 of the first display pixel Pr may be a quantum dot of CdSe or InP, the color filter layer 150 of the second display pixel Pg may be a quantum dot of CdZnSeS, and a third display pixel Pb. The color filter layer 150 may include quantum dots of ZnSe, respectively.

The light emitting display device according to the present application may further include a bank 190 and an encapsulation layer 200.

The bank 190 defines an opening area OA in the pixel area PA, and is provided on the edge of the first electrode E1 and the overcoat layer 170. The bank 190 according to an example may be formed of an organic material such as benzocyclobutene (BCB) -based resin, acrylic resin, or polyimide resin. According to another example, the bank 190 may be formed of a photoresist including a black pigment. In this case, the bank 190 may serve as a light blocking member between adjacent display pixels.

Each of the light emitting layer EL and the second electrode E2 of the light emitting device ED is formed on the bank 190. That is, the light emitting layer EL is formed on the first electrode E1 and the bank 190, and the second electrode E2 is formed to cover the light emitting layer EL.

The encapsulation layer 200 is formed on the substrate 100 to cover the second electrode E2, that is, the entire pixel. The encapsulation layer 200 may serve to protect the thin film transistor, the light emitting device (ED), and the like from an external impact, and to prevent oxygen or / and moisture and particles from penetrating into the light emitting device (ED). have.

The encapsulation layer 200 according to an example may include at least one inorganic layer. The encapsulation layer 200 may further include at least one organic layer. For example, the encapsulation layer 200 may include a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer. The first and second inorganic encapsulation layers may include an inorganic material of any one of silicon oxide (SiOx), silicon nitride (SiNx), silicon oxynitride (SiON), titanium oxide (TiOx), and aluminum oxide (AlOx). have. In addition, the organic encapsulation layer may include an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, a polyimide resin, and a benzocyclobutene resin ( benzocyclobutene resin). The organic encapsulation layer can be represented by a particle cover layer.

Optionally, the encapsulation layer 200 may be changed to a filler surrounding the entire pixel. In this case, the light emitting display device according to the present application may be encapsulated on the substrate 100 via the filler. It includes more. The encapsulation substrate 210 may be made of a metal material.

Additionally, the light emitting display device according to the present application may further include a polarizing film attached to the rear surface (or light extraction surface) 100a of the substrate 100. The polarizing film improves visibility and contrast ratio of the light emitting display device by changing external light reflected by the thin film transistor and / or lines provided in the pixel into a circularly polarized state.

5 is a cross-sectional view illustrating a fourth display pixel according to an example of the present application.

Referring to FIG. 5 and FIG. 2, the fourth display pixel Pw according to an example of the present application is to increase the white luminance of the unit pixel, and the color filter layer in the first to third display pixels illustrated in FIG. 4. Since 150 is not formed all the same, duplicate description thereof will be omitted.

6 and 7 are diagrams illustrating a dummy pixel column according to an example shown in FIG. 1.

Referring to FIG. 6 and FIGS. 1 and 3, the dummy pixel column 101 according to an example of the present application is disposed in the inactive region IA of the substrate corresponding to the outer portion of the active region AA. For example, the dummy pixel column 101 is disposed in the fourth non-active area IA4 of the non-active area IA and is arranged in parallel with the first direction, that is, the length direction of the data line.

First, the plurality of dummy pixels DP may be grouped into a first dummy pixel group DPG1 and a second dummy pixel group DPG2.

The dummy pixel DP of the first dummy pixel group DPG1 among the first dummy pixel group DPG1 and the second dummy pixel group DPG2 may include a color filter layer. That is, the first dummy pixel group DPG1 may include a red dummy pixel DPr, a green dummy pixel DPg, and a blue dummy pixel DPb among the plurality of dummy pixels DP.

Each of the red dummy pixels DPr, the green dummy pixels DPg, and the blue dummy pixels DPb has a pixel structure substantially the same as that of the first to third display pixels Pr, Pg, and Pb shown in FIG. 4. Since the description thereof will be omitted. Accordingly, the first dummy pixel group DPG1 may include a red dummy pixel DPr having a red color filter, a green dummy pixel DPg having a green color filter, and a blue dummy pixel DPb having a blue color filter. Can be.

The dummy pixel DP of the second dummy pixel group DPG2 does not include a color filter layer. That is, the second dummy pixel group DPG2 may include a white dummy pixel DPw among the plurality of dummy pixels DP. Since the white dummy pixel DPw has a pixel structure substantially the same as that of the fourth display pixel Pw shown in FIG. 5, a description thereof will be omitted.

The dummy pixel column 101 according to an example may include a plurality of local dummy groups LG1 to LGn.

Each of the plurality of local dummy groups LG1 to LGn is continuously disposed along the length direction of the data line. Each of the plurality of local dummy groups LG1 to LGn may include a first dummy pixel group DPG1 and a second dummy pixel group DPG2.

In each of the plurality of local dummy groups LG1 to LGn, the second dummy pixel group DPG2 may be disposed in the first dummy pixel group DPG1.

As shown in FIG. 6, in each of the plurality of local dummy groups LG1 to LGn according to an example, the first dummy pixel group DPG1 includes one red dummy pixel DPr and one blue dummy pixel DPb. ) And one green dummy pixel DPg, and the second dummy pixel group DPG2 is one disposed between the red dummy pixel DPr and the blue dummy pixel DPb of the first dummy pixel group DPG1. The white dummy pixel DPw may be included. Here, the dummy pixels of the first dummy pixel group DPG1 may be disposed along the length direction of the data line in order of the red dummy pixel DPr, the blue dummy pixel DPb, and the green dummy pixel DPg. However, the present invention is not limited thereto. Each of the plurality of local dummy groups LG1 to LGn according to this example may be one unit pixel arranged along the length direction of the data line.

Meanwhile, as shown in FIG. 7, in each of the plurality of local dummy groups LG1 to LGn according to an example, the first dummy pixel group DPG1 may include two or more red dummy pixels DPr disposed in succession. Two or more blue dummy pixels DPb disposed in succession and two or more green dummy pixels DPg disposed in succession, wherein the second dummy pixel group DPG2 is a red color of the first dummy pixel group DPG1. Two or more white dummy pixels DPw consecutively disposed between the dummy pixel DPr and the blue dummy pixel DPb. Here, the dummy pixels of the first dummy pixel group DPG1 may be disposed along the length direction of the data line in order of the red dummy pixel DPr, the blue dummy pixel DPb, and the green dummy pixel DPg. However, the present invention is not limited thereto.

In addition, the dummy pixel column 101 according to the present example may have a plurality of local dummy groups LG1 to LGn and may be arranged in the third inactive region IA3 of the inactive region IA to be parallel to the data line DL. It may be further arranged. In addition, the dummy pixel columns 101 according to the present example may have the plurality of local dummy groups LG1 to LGn described above, and may be parallel to the gate line GL to form the first and second inactive regions of the inactive region IA. It may also be arranged in addition to (IA1, IA2). As a result, the dummy pixel column 101 according to the present example is inactive while having the plurality of local dummy groups LG1 to LGn including the first dummy pixel group DPG1 and the second dummy pixel group DPG2. The first to fourth non-active areas IA1, IA2, IA3, and IA4 of the area IA may be disposed. That is, at least one of the first to fourth inactive regions IA1, IA2, IA3, and IA4 of the inactive region IA includes a first dummy pixel group DPG1 and a second dummy pixel group DPG2.

As described above, the light emitting display device including the dummy pixel column 101 according to the present exemplary embodiment includes not only the red dummy pixel DPr, the blue dummy pixel DPb, and the green dummy pixel DPg, but also the white dummy pixel DPw. For example, the characteristic values of each of the dummy driving transistor Tdr 'and / or the dummy light emitting device ED' including only a temperature change excluding a change over time may be sensed for each location. For example, the light emitting display device according to the present exemplary embodiment may include the dummy pixel DP in units of at least one horizontal pixel column and / or at least one vertical pixel column according to the arrangement structure of the dummy pixel column 101 illustrated in FIG. 6. The characteristic value of (the characteristic value of the dummy driving transistor Tdr 'and / or the characteristic value of the dummy light emitting device ED') can be sensed. In particular, when the light emitting display according to the present embodiment senses the characteristic value of the dummy pixel DP in units of two or more horizontal (or vertical) pixel columns, the accuracy of the sensing value may be increased and is generated by a noise component. The deterioration in sensing accuracy can be minimized.

8A is a cross-sectional view illustrating a dummy pixel according to another example included in the first dummy pixel group illustrated in FIG. 6, and FIG. 8B illustrates a dummy pixel according to another example included in the second dummy pixel group illustrated in FIG. 6. It is sectional drawing to show.

Referring to FIG. 8A and FIGS. 3 and 6, each of the red dummy pixel DPr, the blue dummy pixel DPb, and the green dummy pixel DPg of the first dummy pixel group DGP1 according to another example of the present application may be used. The dummy pixel circuit PC ′ including the dummy driving transistor Tdr ′ and the dummy light emitting device ED ′ electrically separated from the dummy pixel circuit PC ′ may be included. In the dummy pixels DPr, DPg, and DPb of the first dummy pixel group DGP1, the dummy pixel circuit PC ′ and the dummy light emitting device ED ′ are electrically separated by the bank 190, and the color filter layer 150 is provided. Has a pixel structure substantially the same as that of the display pixel shown in FIG. Accordingly, duplicate descriptions of components other than the bank 190 and the related components among the components of the dummy pixels DPr, DPg, and DPb of the first dummy pixel group DGP1 will be omitted.

In the first dummy pixel group DGP1, the bank 190 is a dummy light emitting device ED disposed in the opening area OA of each of the red dummy pixel DPr, the blue dummy pixel DPb, and the green dummy pixel DPg. It is formed to cover the first electrode E1 of '). That is, the bank 190 is formed to cover the circuit area CA of each of the red dummy pixel DPr, the blue dummy pixel DPb, and the green dummy pixel DPg, and the red dummy pixel DPr and the blue dummy pixel. A light emitting layer EL is further formed between the first electrode E1 and the light emitting layer EL of the dummy light emitting device ED 'overlapping the opening area OA of each of the DPb and the green dummy pixels DPg. Accordingly, the bank 190 is disposed between the first electrode E1 and the light emitting layer EL of the dummy light emitting device ED ′ in each of the red dummy pixel DPr, the blue dummy pixel DPb, and the green dummy pixel DPg. The dummy pixel circuit PC ′ and the dummy light emitting device ED ′ may be electrically separated from each other by electrically separating the first electrode E1 and the light emitting layer EL of the dummy light emitting device ED ′.

Meanwhile, as illustrated in FIG. 7, the first dummy pixel group DGP1 may include two pixels in which the dummy pixel circuit PC ′ and the dummy light emitting device ED ′ are continuously arranged to be electrically separated by the bank 190. One or more red dummy pixels DPr and two or more blue dummy pixels DPb arranged in succession and two or more green dummy pixels DPg arranged in succession may be included.

8B and 3 and 6, the white dummy pixel DPw of the second dummy pixel group DGP2 according to the present example may include a dummy pixel circuit PC ′ including a dummy driving transistor Tdr ′; And a dummy light emitting device ED ′ electrically isolated from the dummy pixel circuit PC ′. In the white dummy pixel DPw of the second dummy pixel group DGP2, the dummy pixel circuit PC ′ and the dummy light emitting device ED ′ are electrically separated by the bank 190 and do not have the color filter layer 150. Except for the case where the red dummy pixel DPr, the blue dummy pixel DPb, and the green dummy pixel DPg of the first dummy pixel group DGP1 shown in FIG. 8A are substantially the same, Duplicate explanations will be omitted.

On the other hand, the second dummy pixel group DPG2 includes two or more white dummy pixels DPw continuously disposed such that the dummy pixel circuit PC ′ and the dummy light emitting device ED ′ are electrically separated by the bank 190. It may include.

As such, the light emitting display device including the dummy pixel according to the present exemplary embodiment may include not only the red dummy pixel DPr, the blue dummy pixel DPb, and the green dummy pixel DPg included in the first dummy pixel group DGP1. For each of the white dummy pixels DPw included in the two dummy pixel groups DGP2, a characteristic value of the dummy driving transistor Tdr ′ including only a temperature change excluding a change over time may be sensed for each location.

9 is a diagram illustrating a dummy pixel column according to another example illustrated in FIG. 1, and FIG. 10 is a cross-sectional view illustrating dummy pixels of the first dummy pixel group illustrated in FIG. 9.

9 and 10, the dummy pixel column 101 according to another example of the present application is disposed in the inactive region IA of the substrate corresponding to the outer portion of the active region AA. . For example, the dummy pixel column 101 is disposed in the fourth non-active area IA4 of the non-active area IA and is arranged in parallel with the first direction, that is, the length direction of the data line.

The dummy pixel column 101 according to another example of the present application may include a plurality of first dummy pixel groups DPG1 and a plurality of second dummy pixel groups DPG2 arranged alternately along the length direction of the data line. Can be.

Each of the plurality of first dummy pixel groups DPG1 may include a plurality of first dummy pixels DP1 having the color filter layer 150 among the plurality of dummy pixels DP. Here, the first dummy pixel group DPG1 may include two or more first dummy pixels DP1, and may include, for example, two, three, or four first dummy pixels DP1. Can be.

The plurality of first dummy pixels DP1 may be continuously disposed along the length direction of the data line. The plurality of first dummy pixels DP1 has a pixel structure substantially the same as that of the display pixel P illustrated in FIG. 4 except for the color filter layer 150. Accordingly, redundant description of the remaining components except for the color filter layer 150 among the plurality of first dummy pixels DP1 will be omitted.

The color filter layer 150 of each of the plurality of first dummy pixels DP1 is formed of the red color filter 150r and the green stacked on the substrate so as to overlap the dummy light emitting device ED ′ (or the opening area OA). It may include a color filter 150g and a blue color filter 150b.

The color filter layer 150 of the plurality of first dummy pixels DP1 serves as a light blocking layer to block external light incident on the dummy light emitting device ED ′, so that each of the plurality of first dummy pixels DP1 has a characteristic. Prevents or minimizes the value being changed by external light. For example, the color filter layer 150 of the plurality of first dummy pixels DP1 may prevent or minimize deterioration of the dummy light emitting device ED ′ due to external light.

The plurality of second dummy pixel groups DPG2 may be disposed between the plurality of first dummy pixel groups DPG1. Each of the plurality of second dummy pixel groups DPG2 may include a plurality of second dummy pixels DP2 having no color filter layer 150 among the plurality of dummy pixels DP. That is, each of the plurality of second dummy pixel groups DPG2 may include two or more of the remaining dummy pixels except for the first dummy pixel DP1 in the plurality of dummy pixels DP. Here, the number of second dummy pixels DP included in the second dummy pixel group DPG2 may be equal to the number of first dummy pixels DP1 included in the first dummy pixel group DPG1.

The plurality of second dummy pixels DP2 may be continuously disposed along the length direction of the data line. The plurality of second dummy pixels DP2 have a structure in which the color filter layer 150 is removed from the first dummy pixels DP1 shown in FIG. 10 or as shown in FIG. 5, the fourth display pixels or the white dummy. It has a pixel structure substantially the same as the pixel. Accordingly, redundant description of the plurality of second dummy pixels DP1 will be omitted.

Unlike the plurality of first dummy pixels DP1, each of the plurality of second dummy pixels DP2 may have a characteristic value changed by external light. In the plurality of second dummy pixels DP2, the dummy light emitting device ED ′ may be deteriorated by external light. The second dummy pixel DP2 may be used to sense whether a characteristic change of the dummy pixel DP is caused by external light as compared to the first dummy pixel DP1.

As described above, in the light emitting display device including the dummy pixel column 101 according to the present example, the first dummy pixel DP1 of each of the plurality of first dummy pixel groups DPG1 is changed over time and changed by external light. A characteristic value of each of the dummy driving transistor Tdr 'and / or the dummy light emitting device ED' including only a temperature change except for the above may be sensed, and the second dummy pixel of each of the plurality of second dummy pixel groups DPG2 may be sensed. A characteristic value of each of the dummy driving transistor Tdr 'and / or the dummy light emitting device ED' including the change caused by external light and the temperature change except for the change over time may be sensed with respect to DP2. Accordingly, the light emitting display device according to the present example compares the sensing value of the first dummy pixel DP1 with the sensing value of the second dummy pixel DP2 to calculate an optical compensation gain value to further add pixel data Pdata. You can correct it.

FIG. 11 is a diagram illustrating an arrangement structure of dummy pixels according to another example of the present application, and FIG. 12 is a diagram illustrating an arrangement structure of the dummy pixels illustrated in FIG. 11.

11 and 12, the dummy pixel DP according to another example of the present application may be disposed in the first non-active area IA1 of the display panel 10.

The first non-active area IA1 has a dummy pixel column having a plurality of second local dummy groups LG2 disposed between the plurality of first local dummy groups LG1 and the plurality of first local dummy groups LG1. 101).

Each of the plurality of first and second local dummy groups LG1 and LG2 may include a first dummy pixel group DPG1 and a second dummy pixel group DPG2.

Each of the dummy pixels of the first dummy pixel group DPG1 and the second dummy pixel group DPG2 included in each of the plurality of first local dummy groups LG1 includes a dummy driving transistor Tdr '. And a dummy light emitting device ED 'electrically connected to the dummy pixel circuit PC'.

Since the first dummy pixel group DPG1 included in each of the plurality of first local dummy groups LG1 has substantially the same pixel structure as the first dummy pixel group shown in FIG. The description will be omitted.

The second dummy pixel group DPG2 included in each of the plurality of first local dummy groups LG1 has a pixel structure substantially the same as that of the second dummy pixel group illustrated in FIG. 6 or 7, and thus overlaps with the second dummy pixel group DPG2. The description will be omitted.

Each of the dummy pixels of the first dummy pixel group DPG1 and the second dummy pixel group DPG2 included in each of the plurality of second local dummy groups LG2 includes a dummy driving transistor Tdr '. And a dummy light emitting device ED 'electrically separated from the dummy pixel circuit PC'.

The dummy pixels of the first dummy pixel group DPG1 included in each of the plurality of second local dummy groups LG2 include the red dummy pixels DPr, the blue dummy pixels DPb, and the green dummy pixels shown in FIG. 8A. Since the pixel structure is substantially the same as DPg), duplicate description thereof will be omitted.

Since the dummy pixels of the second dummy pixel group DPG2 included in each of the plurality of second local dummy groups LG2 have substantially the same pixel structure as the white dummy pixel DPw shown in FIG. 8B, Duplicate explanations will be omitted.

13 is a view illustrating a temperature distribution of a display panel when the display panel is driven in the light emitting display device according to an example of the present application.

Referring to FIG. 13 and FIG. 1, when the display panel 10 is driven, a temperature of the display panel 10 may be relatively high in an area corresponding to a connection portion between the display panel 10 and the data driving circuit unit 330. Has a distribution. For example, the first non-active area IA1 of the first to fourth non-active areas IA1, IA2, IA3, and IA4 of the display panel 10 may be electrically connected to the data driving circuit part 330 while being connected to the data driving circuit part (330). By being disposed on the 330, the temperature distribution may be relatively high due to heat generated by the driving of the data driving circuit 330.

Accordingly, the light emitting display device including the dummy pixel arrangement structure according to the present exemplary embodiment includes a plurality of dummy pixels disposed in the first non-active area IA1 of the display panel 10 as illustrated in FIGS. 11 and 12. And a characteristic value of each of the plurality of dummy pixels DP including only a temperature change excluding a change over time in the sensing driving, and based on this, pixel data to be supplied to each display pixel P. By correcting, the temperature of the display panel 10 may be sensed without a separate temperature sensor to effectively compensate for the characteristic change of the pixel P according to the temperature change.

FIG. 14 is a diagram illustrating an arrangement structure of dummy pixels according to another example of the present application, and FIG. 15 is a diagram illustrating an arrangement structure of dummy pixels illustrated in FIG. 14.

14 and 15, the dummy pixel DP according to another example of the present application may include the first to fourth non-active areas IA1, which surround the active area AA of the display panel 10. IA2, IA3, and IA4), respectively.

Each of the first to fourth non-active areas IA1, IA2, IA3, and IA4 may include a first dummy pixel group DPG1 and a second dummy pixel group DPG2.

Each of the first to fourth non-active areas IA1, IA2, IA3, and IA4 may include a plurality of second local dummy units disposed between the plurality of first local dummy groups LG1 and the plurality of first local dummy groups LG1. It may include a group LG2. Each of the second to fourth non-active areas IA2, IA3, and IA4 may further include a plurality of third local dummy groups LG3. Each of the first to third local dummy groups LG1, LG2, and LG3 may include a first dummy pixel group DPG1 and a second dummy pixel group DPG2.

The first non-active area IA1 may include a plurality of first local dummy groups LG1 and a plurality of second local dummy groups LG2 disposed between the plurality of first local dummy groups LG1. The plurality of first and second local dummy groups LG1 and LG2 disposed in the first non-active area IA1 are symmetrical with respect to the first center line CL1 (or the horizontal center line) of the display panel 10. It may have a structure. Each of the plurality of first and second local dummy groups LG1 and LG2 disposed in the first non-active area IA1 may include a first dummy pixel group DPG1 and a second dummy pixel group DPG2. Each of the plurality of first and second local dummy groups LG1 and LG2 disposed in the first non-active area IA1 may include the plurality of first and second local dummy groups LG1 and LG2 shown in FIGS. 11 and 12. Since each pixel has substantially the same pixel structure, overlapping description thereof will be omitted.

Each of the second to fourth non-active areas IA2, IA3, and IA4 may include a plurality of first to third local dummy groups LG1, LG2, and LG3 sequentially disposed along the length direction.

In the second inactive area IA2, the first local dummy group LG1 is disposed to be adjacent to the third and fourth inactive areas IA3 and IA4, and the second local dummy group LG2 is disposed in the first local dummy. The third local dummy group LG3 may be disposed to be adjacent to the group LG1, and the third local dummy group LG3 may be disposed to be adjacent to the second local dummy group LG2. The plurality of first to third local dummy groups LG1, LG2, and LG3 disposed in the second non-active area IA2 may have a left-right symmetrical structure with respect to the first center line CL1 of the display panel 10. Can be.

In each of the third and fourth inactive regions IA3 and IA4, the first local dummy group LG1 is disposed to be adjacent to the first and second inactive regions IA1 and IA2, and the second local dummy group LG2. ) May be disposed adjacent to the first local dummy group LG1, and the third local dummy group LG3 may be disposed adjacent to the second local dummy group LG2. In particular, in each of the third and fourth inactive regions IA3 and IA4, the plurality of first and second local dummy groups LG1 and LG2 may be formed in the upper region of the display panel 10 adjacent to the first inactive region IA1. For example, the display panel 10 may be disposed in a lower region of the display panel 10 adjacent to the second non-active region IA2 and in an intermediate region between the upper region and the lower region. In each of the third and fourth non-active areas IA3 and IA4, the plurality of third local dummy groups LG3 may be formed between an upper area and an intermediate area of the display panel 10, and a plurality of third local dummy groups LG3. It may be disposed in the area between the lower region and the middle region, respectively. The plurality of first to third local dummy groups LG1, LG2, and LG3 disposed in the third and fourth non-active areas IA3 and IA4 may have a second center line CL2 (or vertical) of the display panel 10. Center line) to have a vertically symmetrical structure.

Each of the first to third local dummy groups LG1, LG2, and LG3 disposed in each of the second to fourth non-active areas IA2, IA3, and IA4 may have a first dummy pixel group DPG1 and a second dummy. The pixel group DPG2 may be included.

Each of the first dummy pixel group DPG1 and the second dummy pixel group DPG2 of each of the plurality of first local dummy groups LG1 disposed in each of the second to fourth non-active areas IA2, IA3, and IA4 is illustrated in FIG. Since the first dummy pixel group DPG1 and the second dummy pixel group DPG2 of the first local dummy group LG1 illustrated in FIGS. 11 and 12 have substantially the same pixel structure, the description thereof will not be repeated. Shall be.

Each of the first dummy pixel group DPG1 and the second dummy pixel group DPG2 of each of the plurality of second local dummy groups LG2 disposed in each of the second to fourth non-active areas IA2, IA3, and IA4 is illustrated in FIG. Since the first dummy pixel group DPG1 and the second dummy pixel group DPG2 of the second local dummy group LG2 shown in FIGS. 11 and 12 have substantially the same pixel structures, redundant description thereof will be omitted. Shall be.

Each of the first dummy pixel group DPG1 and the second dummy pixel group DPG2 of each of the plurality of third local dummy groups LG3 disposed in each of the second to fourth non-active areas IA2, IA3, and IA4 is illustrated in FIG. Since the first dummy pixel group DPG1 and the second dummy pixel group DPG2 shown in FIGS. 9 and 10 have substantially the same pixel structure, overlapping description thereof will be omitted.

In the present example, each of the plurality of first local dummy groups LG1 may have characteristics of each of the dummy driving transistor Tdr 'and / or the dummy light emitting device ED' in the dummy pixel DP according to the temperature change except for the change over time. In order to sense the value, the display panel 10 is disposed in the second to fourth inactive regions IA2, IA3, and IA4 as well as the first inactive region IA1 having a relatively high temperature when the display panel 10 is driven. Each of the plurality of second local dummy groups LG2 may drive the display panel 10 to sense a characteristic value of the dummy driving transistor Tdr 'in the dummy pixel DP according to a temperature change except for a change in time. Adjacent to each of the plurality of first local dummy groups LG1 having a relatively high temperature. In addition, each of the plurality of third local dummy groups LG3 may have characteristics of each of the dummy driving transistor Tdr 'and / or the dummy light emitting device ED' including only a temperature change excluding changes over time and changes due to external light. The display panel 10 may be configured to sense characteristic values of the dummy driving transistor Tdr 'and / or the dummy light emitting device ED' including the temperature change and the change caused by external light except for the change over time. It is disposed in the second to fourth inactive regions IA2, IA3, IA4 having relatively low temperatures during operation.

In the light emitting display device including the dummy pixel arrangement structure according to the present exemplary embodiment, a dummy in the dummy pixel DP according to a temperature change excluding a change over time through the dummy pixel DP of the first local dummy group LG1 is provided. The dummy pixel DP according to the temperature change except for the change over time through the characteristic value of each of the driving transistor Tdr 'and / or the dummy light emitting device ED' and the dummy pixel DP of the second local dummy group LG2. Through the characteristic value of the internal dummy driving transistor Tdr 'and the dummy pixel DP of the third local dummy group LG3, the optical pixel according to the presence or absence of external light except the change over time and the dummy pixel DP according to the temperature change ) And a compensation value of the pixel data Pdata to be displayed on the display pixel P by calculating a temperature compensation gain value by sensing a characteristic value of each of the dummy driving transistor Tdr 'and / or the dummy light emitting device ED'. Driving transistor in the display pixel P The characteristic value and / or the characteristic variation of the light emitting element of the emitter can be compensated by accurate sensing.

FIG. 16A is a graph illustrating a change in temperature with respect to the mobility of a driving transistor in a display pixel in a comparative example, and FIG. 16B is a temperature of the mobility of the driving transistor in a display pixel in an example of the present application. This is a graph to explain the change over time. In each of FIGS. 16A and 16B, the horizontal axis shows the mobility sensing value in the driving transistor in the display pixel, the vertical axis shows the compensation gain value for the sensing value, the dotted line graph shows the change over time at room temperature, and the dashed-dotted graph shows the change over time at 45 ° C. Changes, and bold solid lines, respectively, represent changes over time at 60 ° C.

As shown in FIG. 16A, it can be seen that in the comparative example, the slope of the temporal change with respect to the mobility of the driving transistor in the display pixel decreases as the temperature increases. That is, the comparative example senses the mobility of the driving transistor in the display pixel in the sensing driving and calculates a compensation gain value based on the sensing. Therefore, as the temperature increases due to the change of the driving transistor over time and the temperature, the driving increases. The slope of the change over time with respect to the mobility of the transistor decreases. Therefore, the comparative example cannot accurately compensate for and compensate for the mobility of the driving transistor in the display pixel due to the change with time with temperature.

As shown in FIG. 16B, it can be seen that, as an example of the present application, the slope of the temporal change with respect to the mobility of the driving transistor in the display pixel does not decrease significantly even when the temperature increases. That is, one example of the present application senses the mobility of the driving transistor in the dummy pixel in the sensing driving, and calculates a compensation gain value for the display pixel based on the sensing time, and thus changes over time with respect to the mobility of the driving transistor even when the temperature increases. The slope of does not decrease. Thus, in the present application, since the mobility of the driving transistor in the display pixel can be classified into a change according to temperature and a change over time based on the sensing value of the dummy pixel, the mobility of the driving transistor in the display pixel is accurately sensed and compensated. can do.

The light emitting display device according to the present application may be described as follows.

A light emitting display device according to an example of the present application has a plurality of substrates having an active region and an inactive region surrounding the active region, a pixel circuit disposed in the active region, including a driving transistor, and a light emitting element electrically connected to the driving transistor. And a plurality of dummy pixels having a display pixel, and a dummy pixel circuit disposed in an inactive region and including a dummy driving transistor, and a dummy light emitting element electrically connected to or electrically separated from the dummy driving transistor, wherein the plurality of dummy pixels include a plurality of dummy pixels. The dummy pixels of the first dummy pixel group and the second dummy pixel group, which are grouped into the first dummy pixel group and the second dummy pixel group, may further include a color filter layer overlapping the dummy light emitting device.

In one example of the present application, an inactive region of a substrate is defined by a first inactive region defined at a first edge of the substrate, a second inactive region defined at a second edge of the substrate parallel to the first inactive region, at a third edge of the substrate A third inactive region defined, and a fourth inactive region defined at a fourth edge of the substrate parallel to the third inactive region, wherein at least one of the first to fourth inactive regions is a first dummy pixel group and a second dummy It may include a pixel group.

In an example of the present application, the dummy light emitting device is electrically connected to the dummy driving transistor, and the color filter layer includes at least one of a red color filter, a green color filter, and a blue color filter, and the first dummy pixel group includes a plurality of dummy At least one red dummy pixel having a red color filter and at least one green dummy pixel having a green color filter and at least one blue dummy pixel having a blue color filter, wherein the second dummy pixel group includes a plurality of dummy pixels. At least one dummy pixel having no color filter layer among the pixels may be included.

In an example of the present application, the inactive region of the substrate may include a dummy pixel column having a plurality of local dummy groups, and each of the plurality of local dummy groups may include a first dummy pixel group and a second dummy pixel group.

In an example of the present application, the inactive region of the substrate includes a dummy pixel column including a plurality of dummy pixels, and the first dummy pixel group and the second dummy pixel group are alternately disposed along the length direction of the dummy pixel column. The color filter layer may include a red color filter, a green color filter, and a blue color filter stacked on the substrate.

The light emitting display device may further include a bank for electrically separating the dummy driving transistor and the dummy light emitting element of each of the plurality of dummy pixels.

In an example of the present application, the inactive region of the substrate may include a dummy pixel column having a plurality of local dummy groups, and each of the plurality of local dummy groups may include a first dummy pixel group and a second dummy pixel group.

In one example of the present application, an inactive region of a substrate includes a first inactive region defined at a first edge of the substrate, the first inactive region being between a plurality of first local dummy groups and a plurality of first local dummy groups Each of the plurality of first and second local dummy groups may include a first dummy pixel group and a second dummy pixel group.

In an example of the present application, the dummy light emitting devices of the dummy pixels disposed in the first and second dummy pixel groups of each of the plurality of first local dummy groups are electrically connected to the dummy driving transistor, and the plurality of second local dummy groups are provided. The dummy light emitting devices of the dummy pixels disposed in each of the first and second dummy pixel groups may be electrically separated from the dummy driving transistor.

In one example of the present application, an inactive region of a substrate is defined by a first inactive region defined at a first edge of the substrate, a second inactive region defined at a second edge of the substrate parallel to the first inactive region, at a third edge of the substrate A third non-active area defined, and a fourth non-active area defined at a fourth edge of the substrate parallel to the third non-active area, each of the first to fourth non-active areas each comprising a first dummy pixel group and a second The dummy pixel group may be included.

In one example of the present application, each of the first to fourth inactive regions includes a plurality of first local dummy groups and a plurality of second local dummy groups disposed between the plurality of first local dummy groups, Each of the four non-active areas may further include a plurality of third local dummy groups, and each of the first to third local dummy groups may include a first dummy pixel group and a second dummy pixel group.

In an example of the present application, the dummy light emitting devices of the dummy pixels disposed in the first and second dummy pixel groups of each of the plurality of first and third local dummy groups are electrically connected to the dummy driving transistor, and the plurality of second The dummy light emitting devices of the dummy pixels disposed in the first and second dummy pixel groups of each of the local dummy groups may be electrically separated from the dummy driving transistor.

In an example of the present application, the method may further include a bank for electrically separating the dummy driving transistor and the dummy light emitting device of the dummy pixel disposed in the first and second dummy pixel groups of each of the plurality of second local dummy groups.

In an example of the present application, the color filter layer disposed in the dummy pixel of the first dummy pixel group included in each of the plurality of third local dummy groups includes a red color filter, a green color filter, and a blue color filter stacked on the substrate. can do.

In an example of the present application, the color filter layer includes at least one of a red color filter, a green color filter, and a blue color filter, and the first dummy pixel group includes at least one red dummy pixel having a red color filter among the plurality of dummy pixels. And at least one green dummy pixel having a green color filter and at least one blue dummy pixel having a blue color filter, wherein the second dummy pixel group includes at least one white dummy pixel having no color filter layer among the plurality of dummy pixels. It may include.

According to an exemplary embodiment, a light emitting display device includes a display panel including a substrate, a plurality of display pixels, and a plurality of dummy pixels, and a display panel in a display mode or a sensing mode, and a plurality of sensing lines in a sensing mode of the display panel. The display apparatus may further include a panel driving circuit configured to sense characteristic values of each of the plurality of display pixels and characteristic values of the plurality of dummy pixels through each of the plurality of display pixels.

In an example of the present application, the panel driving circuit unit may emit light of the light emitting elements of each of the plurality of display pixels in the display mode of the display panel, and simultaneously emit non-light emitting of the dummy light emitting elements of each of the plurality of dummy pixels. In this case, the panel driving circuit unit may supply the non-emission data voltage to each of the plurality of dummy pixels in display driving of the display panel.

Features, structures, effects, and the like described in the examples of the present application described above are included in at least one example of the present application, and are not necessarily limited to one example. Furthermore, the features, structures, effects, and the like illustrated in at least one example of the present application may be combined or modified with respect to other examples by those skilled in the art to which the present application belongs. Therefore, contents related to such combinations and modifications should be interpreted as being included in the scope of the present application.

The present application described above is not limited to the above-described embodiments and the accompanying drawings, and it is common in the art that various substitutions, modifications, and changes can be made without departing from the technical matters of the present application. It will be apparent to those who have the knowledge of. Therefore, the scope of the present application is represented by the following claims, and it should be construed that all changes or modifications derived from the meaning and scope of the claims and equivalent concepts thereof are included in the scope of the present application.

10: display panel 30: panel drive circuit portion
100 substrate 101 dummy pixel string
150: color filter layer 190: bank
330: data driving circuit 350: timing control circuit

Claims (19)

A substrate having an active region and an inactive region surrounding the active region;
A plurality of display pixels disposed in the active region and having a pixel circuit including a driving transistor and a light emitting element electrically connected to the driving transistor; And
A dummy pixel circuit disposed in the inactive region and including a dummy driving transistor and a plurality of dummy pixels having a dummy light emitting device electrically connected to or electrically separated from the dummy driving transistor,
The plurality of dummy pixels are grouped into a first dummy pixel group and a second dummy pixel group.
The dummy pixel of the first dummy pixel group of the first dummy pixel group and the second dummy pixel group further includes a color filter layer overlapping the dummy light emitting element. The method of claim 1,
The inactive region of the substrate is a first inactive region defined at a first edge of the substrate, a second inactive region defined at a second edge of the substrate parallel to the first inactive region, and defined at a third edge of the substrate. A third inactive region, and a fourth inactive region defined at a fourth edge of the substrate parallel to the third inactive region,
At least one of the first to fourth non-active areas includes the first dummy pixel group and the second dummy pixel group. The method of claim 2,
The dummy light emitting device is electrically connected to the dummy driving transistor,
The color filter layer includes at least one of a red color filter, a green color filter, and a blue color filter.
The first dummy pixel group may include at least one red dummy pixel having the red color filter, at least one green dummy pixel having the green color filter, and at least one blue dummy having the blue color filter. Includes pixels,
And the second dummy pixel group includes at least one white dummy pixel that does not have the color filter layer among the plurality of dummy pixels. The method of claim 3, wherein
The non-active area of the substrate includes a plurality of local dummy groups,
And wherein each of the plurality of local dummy groups includes the first dummy pixel group and the second dummy pixel group. The method of claim 2,
The first dummy pixel group and the second dummy pixel group are alternately arranged.
The color filter layer includes a red color filter, a green color filter, and a blue color filter stacked on the substrate. The method of claim 2,
And a bank for electrically separating the dummy driving transistor and the dummy light emitting element of each of the plurality of dummy pixels. The method of claim 6,
The color filter layer includes at least one of a red color filter, a green color filter, and a blue color filter.
The first dummy pixel group may include at least one red dummy pixel having the red color filter, at least one green dummy pixel having the green color filter, and at least one blue dummy having the blue color filter. Includes pixels,
And the second dummy pixel group includes at least one white dummy pixel having no color filter layer among the plurality of dummy pixels. The method of claim 7, wherein
The non-active area of the substrate includes a plurality of local dummy groups,
And wherein each of the plurality of local dummy groups includes the first dummy pixel group and the second dummy pixel group. The method of claim 1,
The inactive area of the substrate comprises a first inactive area defined at a first edge of the substrate,
The first non-active area has a plurality of first local dummy groups and a plurality of second local dummy groups disposed between the plurality of first local dummy groups,
And each of the plurality of first and second local dummy groups includes the first dummy pixel group and the second dummy pixel group. The method of claim 9,
The dummy light emitting devices of the dummy pixels disposed in the first and second dummy pixel groups of each of the plurality of first local dummy groups are electrically connected to the dummy driving transistors,
And a dummy light emitting element of the dummy pixels disposed in the first and second dummy pixel groups of each of the plurality of second local dummy groups is electrically separated from the dummy driving transistor. The method of claim 10,
And a bank for electrically separating the dummy driving transistor and the dummy light emitting element of the dummy pixel disposed in the first and second dummy pixel groups of each of the plurality of second local dummy groups. The method of claim 2,
Each of the first to fourth non-active areas includes a plurality of first local dummy groups and a plurality of second local dummy groups disposed between the plurality of first local dummy groups,
Each of the second to fourth non-active areas further includes a plurality of third local dummy groups,
And each of the plurality of first to fourth local dummy groups includes the first dummy pixel group and the second dummy pixel group. The method of claim 12,
The dummy light emitting devices of the dummy pixels disposed in the first and second dummy pixel groups of each of the plurality of first and third local dummy groups are electrically connected to the dummy driving transistors,
And a dummy light emitting element of the dummy pixels disposed in the first and second dummy pixel groups of each of the plurality of second local dummy groups is electrically separated from the dummy driving transistor. The method of claim 13,
And a bank for electrically separating the dummy driving transistor and the dummy light emitting element of the dummy pixel disposed in the first and second dummy pixel groups of each of the plurality of second local dummy groups. The method of claim 13,
The color filter layer disposed on the dummy pixels of the first dummy pixel group included in each of the plurality of third local dummy groups includes a red color filter, a green color filter, and a blue color filter stacked on the substrate. Display device. The method according to any one of claims 9 to 14,
The color filter layer includes at least one of a red color filter, a green color filter, and a blue color filter.
The first dummy pixel group may include at least one red dummy pixel having the red color filter, at least one green dummy pixel having the green color filter, and at least one blue dummy having the blue color filter. Includes pixels,
And the second dummy pixel group includes at least one white dummy pixel having no color filter layer among the plurality of dummy pixels. The method according to any one of claims 1 to 15,
A display panel including the substrate, the plurality of display pixels, and the plurality of dummy pixels; And
A panel driving circuit unit driving the display panel in a display mode or a sensing mode and sensing characteristic values of each of the plurality of display pixels and characteristic values of the plurality of dummy pixels through each of the plurality of sensing lines in the sensing mode of the display panel; Further comprising a light emitting display device. The method of claim 17,
And the panel driving circuit unit emits light emitting elements of each of the plurality of display pixels and non-emits the dummy light emitting elements of each of the plurality of dummy pixels in the display mode of the display panel. The method of claim 18,
And the panel driving circuit unit supplies a non-emission data voltage to each of the plurality of dummy pixels in a display mode of the display panel.

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