Display devices

Abstract

A display device is disclosed, comprising: a display panel having a plurality of pixels of different colors arranged thereon; a power supply configured to supply a high-potential driving voltage to the display panel; and a data driver configured to calculate an average image level of input image data and generate a data voltage based on a compensation value for compensating for a voltage drop of the high-potential driving voltage based on the calculated average image level, wherein the compensation value is set independently for each color.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2021-0193166, filed on December 30, 2021, the entire contents of which are incorporated herein by reference for all purposes. Technical Field

[0003] This disclosure relates to display devices. Background Technology

[0004] Organic light-emitting diodes (hereinafter referred to as LEDs) in organic light-emitting display devices are self-emissive and do not require a separate light source, thus reducing the thickness and weight of the display device. Furthermore, organic light-emitting display devices exhibit high-quality characteristics such as low power consumption, high brightness, and fast response time.

[0005] Typically, a light-emitting diode (LED) has the following structure: an anode, a dam surrounding an edge region of the anode, a light-emitting layer formed on the anode within the dam, and a cathode covering the light-emitting layer and the dam. When a driving transistor controls the amount of current flowing through the LED, such an LED emits light with the desired brightness. Summary of the Invention

[0006] One of the purposes of this disclosure is to mitigate differences in brightness on the display panel caused by fluctuations in high-potential drive voltage, thereby improving display quality.

[0007] Furthermore, one of the purposes of this disclosure is to prevent color coordinate distortion when compensating for high-potential drive voltages for pixels of different colors.

[0008] According to one embodiment, a display device includes: a display panel on which a plurality of pixels of different colors are arranged; a power supply configured to supply a high-potential driving voltage to the display panel; and a data driver configured to calculate an average image level (APL) of input image data and generate a data voltage based on a compensation value used to compensate for a voltage drop of the high-potential driving voltage based on the calculated APL. The compensation value can be set independently for each color.

[0009] The data driver may include: an APL calculator configured to calculate the APL; a memory configured to store compensation values ​​based on the APL; and a compensator configured to generate a data voltage based on the compensation values ​​corresponding to the calculated APL.

[0010] Compensators can be provided independently for each color.

[0011] The data driver may include: a shift register configured to output a sampled signal in response to a data drive control signal output from a timing controller; a latch configured to sample image data into a digital data signal in response to the sampled signal; a reference voltage generator configured to generate a reference voltage; a gamma voltage generator configured to generate a gamma voltage based on the reference voltage; and a digital-to-analog converter (DAC) configured to convert the digital data signal into an analog data signal based on the gamma voltage and output the analog data signal as a data voltage.

[0012] The data driver may also include a compensation circuit configured to output a compensation value corresponding to the calculated APL, and the gamma voltage generator may be configured to receive a reference voltage with or without the compensation value.

[0013] Compensation circuits and reference voltage generators can be provided independently for each color.

[0014] Gamma voltage can be provided separately to pixels of different colors as different groups of gamma voltage.

[0015] The data driver can be configured to set a compensation value to decrease the data voltage when the calculated APL increases, and to set a compensation value to increase the data voltage when the calculated APL decreases.

[0016] The compensation circuit can be configured to perform additive compensation to add a compensation value to the reference voltage when APL increases, and to perform subtractive compensation to subtract the compensation value from the reference voltage when APL decreases.

[0017] The compensation value can be pre-stored in the memory of the display device, or generated by the display device detecting fluctuations in the high-potential drive voltage, or received from outside the display device.

[0018] According to another embodiment, a compensation method for a display device with multiple pixels of different colors includes: calculating the average image level (APL) of input image data; generating a data voltage based on a compensation value used to compensate for a voltage drop of a high-potential driving voltage based on the calculated APL, wherein the compensation value is set independently for each color. Attached Figure Description

[0019] Figure 1 This is a block diagram of a display device according to an embodiment.

[0020] Figure 2 This is a circuit diagram of the pixel according to the implementation method.

[0021] Figure 3 This is a detailed block diagram of a display device according to an embodiment.

[0022] Figures 4 to 6 It is a view used to describe color coordinate distortion.

[0023] Figure 7 This is a detailed block diagram of a display device according to another embodiment.

[0024] Figure 8 This is a block diagram of a data driver according to an implementation method.

[0025] Figure 9 This is a view showing the internal configuration of the data driver according to an implementation.

[0026] Figure 10 and Figure 11 This is a diagram used to describe the compensation method according to the implementation method. Detailed Implementation

[0027] The embodiments will now be described with reference to the accompanying drawings. In this specification, when an element (or region, layer, portion) is referred to as being "on," "connected to," or "coupled to" another element, the other element may be directly disposed on / connected to / coupled to the first element, or there may be an intervening third element.

[0028] The same reference numerals refer to the same elements throughout the text. Furthermore, in the accompanying drawings, the thickness, scale, and dimensions of the elements are exaggerated for clarity. The term "and / or" includes any and all combinations of one or more of the related listed elements.

[0029] Although terms such as “first” and “second” are used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from others. For example, a first element referred to as a first element in one embodiment may be referred to as a second element in another embodiment without departing from the scope of the appended claims. Unless the context otherwise requires, singular terms may include plural forms.

[0030] In addition, terms such as "below," "under," "above," and "on top" are used to describe the relationships between the elements shown in the accompanying drawings. These terms can be relative concepts and are described based on the directions expressed in the drawings.

[0031] The terms “comprising” or “including” specify an attribute, fixed number, step, operation, element, component, or combination thereof, but do not exclude other attributes, fixed numbers, steps, operations, elements, components, or combinations thereof.

[0032] Figure 1 This is a block diagram of a display device according to an embodiment.

[0033] Reference Figure 1 The display device 1 includes a timing controller 10, a gate driver 20, a data driver 30, a power supply 40, and a display panel 50.

[0034] The timing controller 10 can receive an image signal RGB and a control signal CS from an external source. The image signal RGB can include multiple grayscale data. For example, the control signal CS can include a horizontal synchronization signal, a vertical synchronization signal, and a clock signal.

[0035] The timing controller 10 can process the image signal RGB and the control signal CS to suit the operating conditions of the display panel 50, thereby generating and outputting image data RGB', scan drive control signal CONT1, data drive control signal CONT2 and power control signal CONT3.

[0036] Gate driver 20 can generate a gate signal based on the gate drive control signal CONT1 output from timing controller 10. Gate driver 20 can provide the generated gate signal to pixel PX through multiple gate lines GL. When the gate signal is supplied sequentially to the gate lines GL, pixel PX can be selected on a horizontal line basis.

[0037] The data driver 30 can generate a data signal based on the image data RGB' output from the timing controller 10 and the data drive control signal CONT2. When a pixel PX is selected in units of horizontal lines by a scan signal, the data driver 30 can provide the generated data signal to the selected pixel PX through multiple data lines DL.

[0038] Power supply 40 can generate driving voltages ELVDD and ELVSS to be supplied to display panel 50 based on power control signal CONT3. Power supply 40 can supply the generated driving voltages to pixel PX through corresponding power lines PL1 and PL2.

[0039] On the display panel 50, a plurality of pixels PX (or subpixels) are arranged. The pixels PX can be arranged on the display panel 50, for example, in a matrix. Based on the gate signal and data signal supplied through the gate line GL and the data line DL, the pixels PX are controlled to emit light with the desired brightness.

[0040] Each pixel PX can emit red, green, and blue light. According to the implementation, a group of pixels PX emitting red, green, and blue light can be grouped into a single unit pixel.

[0041] The timing controller 10, gate driver 20, data driver 30, and power supply 40 can each be configured as separate integrated circuits (ICs), or at least some of them can be integrated into an IC. For example, at least one of the data driver 30 and power supply 40 can be integrated into the timing controller 10.

[0042] Furthermore, the gate driver 20 is shown as... Figure 1 The gate driver 20 is a separate component from the display panel 50, but it can be configured to be integrated into the display panel 50 via an in-panel method. For example, the gate driver 20 can be integrated into the display panel 50 via a gate-in-panel (GIP) method.

[0043] Figure 2 This is a circuit diagram of the pixel according to the implementation method.

[0044] Reference Figure 2 The pixel PX includes a switching transistor ST, a driving transistor DT, a storage capacitor Cst, and a light-emitting diode LD.

[0045] The switching transistor ST includes a first electrode connected to the data line DL and a second electrode connected to the first node N1. The switching transistor ST also includes a gate electrode connected to the gate line GL. When a gate-on level gate signal is applied to the gate line, the switching transistor ST is turned on, thereby transmitting the data signal applied to the data line to the first node N1.

[0046] A storage capacitor Cst is connected between the anode of the light-emitting diode LD and the first node N1. The storage capacitor Cst can be configured to store a voltage corresponding to the difference between the voltage applied to the first node N1 and the voltage applied to the anode of the light-emitting diode LD.

[0047] The driving transistor DT includes a first electrode that receives a high-potential driving voltage ELVDD and a second electrode connected to the anode of the light-emitting diode LD. The driving transistor DT also includes a gate electrode connected to a first node N1. When a voltage with a gate-on level is applied through the first node N1, the driving transistor DT turns on, thereby controlling the amount of driving current flowing in the light-emitting diode LD based on the voltage supplied to the gate electrode.

[0048] A light-emitting diode (LD) emits light corresponding to a driving current. An LD can emit one of red, green, blue, or white light. An LD can include an organic light-emitting diode (OLED) or an inorganic light-emitting diode with micron to nanometer dimensions, but this disclosure is not limited to this embodiment.

[0049] In this embodiment, the structure of pixel PX is not limited to... Figure 2The structure shown is illustrated. According to an alternative embodiment, the pixel PX may further include at least one element for compensating the threshold voltage of the driving transistor DT or initializing the voltage of the gate electrode of the driving transistor DT and / or the voltage of the anode of the light-emitting diode LD.

[0050] Figure 2 An example of an N-channel metal-oxide-semiconductor (NMOS) transistor being shown for the switching transistor ST and the driving transistor DT is illustrated, but this disclosure is not limited to this example. For example, at least some or all of the transistors in each pixel PX may be P-channel metal-oxide-semiconductor (PMOS) transistors. According to various embodiments, the switching transistor ST and the driving transistor DT may be implemented using low-temperature polycrystalline silicon (LTPS) thin-film transistors, oxide thin-film transistors, or low-temperature polycrystalline oxide (LTPO) thin-film transistors.

[0051] Figure 3 This is a detailed block diagram of a display device according to an embodiment.

[0052] Reference Figure 3 The display device 1 may include: a display panel 50, on which pixels PX are arranged to receive a high-potential driving voltage ELVDD to emit light; a power supply 40 that supplies the high-potential driving voltage ELVDD to the display panel 50; and a data driver 30 that applies a data voltage Vdata corresponding to the input image data RGB' to the display panel 50.

[0053] The high-potential drive voltage ELVDD applied to the display panel 50 may decrease due to the load on the display panel 50. In this case, the load on the display panel 50 can vary depending on the average image level (APL) of the image data RGB'. When the APL of the input image is high, the current consumed by the pixels PX included in the display panel 50 increases, thereby increasing the voltage drop of the high-potential drive voltage ELVDD. On the other hand, when the APL of the input image is low, the current consumed by the pixels PX decreases, thereby decreasing the voltage drop of the high-potential drive voltage ELVDD. The change in the voltage drop of the high-potential drive voltage ELVDD causes the brightness of the APL to decrease or increase, resulting in poor image quality.

[0054] According to an embodiment, the display device 1 can be configured to compensate for this voltage drop (IR drop) of the high-potential drive voltage ELVDD. For example, the data driver 30 can calculate the average luminance (APL) of the input image data RGB' and provide a data voltage Vdata compensated based on the calculated APL to the display panel 50. APL refers to the average luminance of the image data RGB', which can be defined, for example, as the average luminance of the brightest color in a frame of image data RGB'.

[0055] The data driver 30 can convert the input image data RGB' into a data voltage Vdata and send the APL-compensated data voltage Vdata to the display panel 50. For this purpose, the data driver 30 may include an APL calculator 31, a memory 32, and a compensator 33.

[0056] The APL calculator 31 can calculate the APL of input image data RGB' on a frame-by-frame basis.

[0057] The memory 32 can be configured to store compensation values ​​for the data voltage Vdata used in APL. These compensation values ​​can be set based on simulations of fluctuations in the high-potential drive voltage ELVDD according to changes in APL. For example, when the calculated APL increases, the voltage drop of the high-potential drive voltage ELVDD can increase, thus the data voltage Vdata can be compensated for by decreasing it to prevent a relative increase in brightness. Conversely, when the calculated APL decreases, the voltage drop of the high-potential drive voltage ELVDD can decrease, thus the data voltage Vdata can be compensated for by increasing it to prevent a relative decrease in brightness.

[0058] Such a compensation value refers to the compensation voltage given as the high-potential drive voltage ELVDD, which may include, for example, a value added to or subtracted from the reference voltage to generate the data voltage Vdata. The compensation value may be stored in memory 32, for example, in the form of a lookup table (LUT).

[0059] The compensation value can be pre-stored in memory 32 during the manufacture of display device 1. Alternatively, the compensation value can be generated by display device 1 itself detecting fluctuations in the high-potential drive voltage ELVDD, or it can be received from an external source into display device 1 during operation.

[0060] The compensator 33 can load the compensation value corresponding to APL from the memory 32 and generate a compensated data voltage Vdata based on the loaded compensation value. The compensator 33 can send the compensated data voltage Vdata to the display panel 50.

[0061] The foregoing embodiments illustrate data voltage compensation performed in real time on a frame-by-frame basis, but this disclosure is not limited to these embodiments. In other words, data voltage compensation can be performed on a predetermined number of frames, or it can be performed when preset compensation conditions are met. Furthermore, data voltage compensation can be based on a single frame's APL or on multiple frames' APL.

[0062] According to the implementation, the compensation value for the data voltage Vdata can be based on the APL of the image data RGB', and can be equally applied to the display panel 50 on which pixels PX are arranged.

[0063] Figures 4 to 6 It is a view used to describe color coordinate distortion.

[0064] As shown above (refer to the reference) Figure 1 As described, the voltage drop of the high-potential drive voltage ELVDD varies depending on the amount of current consumed by the pixel PX. When the display panel 50 includes pixels R, G, and B for red, green, and blue, the blue pixel B, which emits light with relatively high brightness, can consume more current than the other pixels R and G, and the red pixel R, which emits light with relatively low brightness, can consume less current than the other pixels G and B.

[0065] Therefore, pixels R, G, and B that emit different colors of light have different voltage drops with respect to the high-potential driving voltage ELVDD. Therefore, as... Figure 4 As shown, the red pixel R, green pixel G, and blue pixel B differ in brightness depending on the APL.

[0066] As shown above (refer to the reference) Figure 3 As described, the data driver 30 compensates for the data voltage Vdata based on the APL of the image data RGB', where, as Figure 5 As shown, the compensation value can be applied to pixels of different colors R, G, and B to achieve the same APL-based brightness variation.

[0067] However, as mentioned above, pixels of different colors (R, G, and B) exhibit different voltage drops. Therefore, when the same compensation value is applied to pixels of different colors (R, G, and B), there may be a problem of significant distortion in luminance and color coordinates based on APL, such as... Figure 6 As shown. This can cause crosstalk between pixels R, G, and B, resulting in poor image quality.

[0068] The detailed configuration of the data drive 30 used to solve this problem will be described below.

[0069] Figure 7 This is a detailed block diagram of a display device according to another embodiment.

[0070] Reference Figure 7 The display device 1' may include: a display panel 50 on which pixels PX are arranged to emit light by receiving a high-potential driving voltage ELVDD; a power supply 40 that supplies the high-potential driving voltage ELVDD to the display panel 50; and a data driver 30' that applies a data voltage Vdata corresponding to the input image data RGB' to the display panel 50.

[0071] The data driver 30' can convert the input image data RGB' into a data voltage Vdata and send the APL-compensated data voltage Vdata to the display panel 50. For this purpose, the data driver 30' may include an APL calculator 31', a memory 32', and a compensator 33'.

[0072] In this embodiment, a compensator 33' is provided for each of the pixels R, G, and B that emit light of different colors. In other words, the compensator 33' includes a first compensator 33'R for compensating the data voltage Vdata of the red pixel R, a second compensator 33'G for compensating the data voltage Vdata of the green pixel G, and a third compensator 33'B for compensating the data voltage Vdata of the blue pixel B.

[0073] The first compensator 33'R through the third compensator 33'B can have the same circuit structure. The detailed structure of the data driver 30', including the first compensator 33'R through the third compensator 33'B, will be described below.

[0074] Figure 8 This is a block diagram of a data driver according to an implementation method.

[0075] Reference Figure 8 The data driver 30' includes a gamma voltage generator 330, which generates gamma voltages GMA1 to GMAn based on reference voltages output from the first reference voltage terminal RV1 to the nth reference voltage terminal RVn of the reference voltage generator 360. The data driver 30' converts the digital image data RGB' received from the timing controller 10 into an analog data voltage Vdata based on the gamma voltages GMA1 to GMAn, and outputs the analog data voltage Vdata.

[0076] The reference voltage generator 360 generates and outputs a reference voltage based on a voltage supplied from an external source. According to an embodiment, the reference voltage generator 360 can generate and output a reference voltage based on a compensation value set according to the APL of the input image data RGB'.

[0077] In this case, different compensation values ​​can be given to the data driver 30' based on the corresponding pixels R, G, and B. For example, compensation values ​​can be set individually for pixels R, G, and B of different colors, and a reference voltage reflecting the compensation value can also be provided individually for such pixels R, G, and B.

[0078] Reference voltage generator 360 can be like Figure 8 The configuration shown is external to the data driver 30', or may be included within the data driver 30'. The gamma voltage generator 330 can divide the voltage based on a reference voltage output from the reference voltage generator 360, and generate gamma voltages GMA1 to GMAn based on the divided voltage. Since different reference voltages are provided for pixels R, G, and B of different colors, different gamma voltages GMA1 to GMAn are provided to such pixels R, G, and B.

[0079] The data driver 30' may also include a shift register 310, a latch 320, a digital-to-analog converter (DAC) 340, and an output buffer 350.

[0080] The data drive control signal CONT2 provided by the timing controller 10 includes the source start pulse (SSP) signal, the source sampling clock (SSC) signal, and the source output enable (SOE) signal. The SSP signal controls the data sampling start point of the data driver 30'. The SSC signal is a clock signal that controls the data sampling operation in the data driver 30' with respect to the rising or falling edge. The SOE signal controls the output of the data driver 30'.

[0081] Shift register 310 samples signal SAM in response to the SSP and SSC signals output from timing controller 10. Latch 320 sequentially samples digital data signal DDATA corresponding to image data RGB' in response to the sampled signal SAM output from shift register 310, and simultaneously outputs digital data signal DDATA corresponding to one row sampled from SOE signal.

[0082] DAC 340 converts a line of digital data signal DDATA into analog data signals ADATA corresponding to the first gamma voltage GMA1 to the nth gamma voltage GMAN output from gamma voltage generator 330. Output buffer 350 amplifies (or amplifies and compensates) the analog data signal ADATA output from DAC 340 and outputs it as the data voltage Vdata to each data line.

[0083] Figure 9 This is a view showing the internal configuration of the data driver according to an implementation.

[0084] Reference Figure 8 and Figure 9 The data driver 30' can perform voltage compensation based on the APL of the input image data RGB'. The data driver 30' can use a compensation method that reflects a pre-stored compensation value corresponding to the APL onto a reference voltage VREF. For example, the reference voltage generator 360 may include a compensation circuit 361 for selecting a compensation value corresponding to the APL of the image data RGB' and adding or subtracting the selected compensation value from the reference voltage VREF.

[0085] The data driver 30' may include: a reference voltage generator 360 that generates a reference voltage VREF by reflecting a compensation value provided from a compensation circuit 361; and a gamma voltage generator 330 that includes a resistor string portion for dividing the voltage based on the reference voltage VREF to generate gamma voltages GMA1 to GPAN based on the divided voltage.

[0086] In the reference voltage generator 360, the first reference voltage terminal RV1 is connected to the low gamma voltage terminal BRV1 (or low grayscale gamma voltage terminal) of the gamma voltage generator 330, and the nth reference voltage terminal RVn is connected to the high gamma voltage terminal BRVn (or high grayscale gamma voltage terminal) of the gamma voltage generator 330.

[0087] The compensation circuit 361 is shown as a separate block. Alternatively, the compensation circuit 361 may be provided as a separate circuit or component so as to indirectly add voltage to or subtract from the reference voltage VREF output from the first reference voltage terminal RV1 and the nth reference voltage terminal RVn of the reference voltage generator 360.

[0088] According to the implementation, when the APL of the image data RGB' increases compared to a reference value, the compensation circuit 361 is configured to perform compensation by adding a compensation value to the reference voltage VREF (additive compensation). On the other hand, when the APL decreases compared to the reference value, the compensation circuit 361 is configured to perform compensation by subtracting the compensation value from the reference voltage VREF (subtractive compensation).

[0089] The compensation circuit 361 causes the low gamma voltage terminal BRV1 and the high gamma voltage terminal BRVn of the gamma voltage generator 330 to receive the reference voltage VREF output from the reference voltage generator 360 directly, and instead receive the reference voltage that has undergone addition / subtraction compensation.

[0090] For example, the low gamma voltage terminal BRV1 receives a compensation voltage AVREF1 (hereinafter referred to as the lower reference voltage) ± a high potential drive voltage ELVDD of the low reference voltage VREF1, and the high gamma voltage terminal BRVn receives a compensation voltage AVREFn (hereinafter referred to as the higher reference voltage) ± a high potential drive voltage ELVDD of the high reference voltage VREFn.

[0091] The gamma voltage generator 330 may include multiple resistor strings RS1, RS2 and RS3.

[0092] The first resistor string RS1 generates gamma reference voltages GA1 and GM9 by dividing the voltage between the lower reference voltage VREF1+AVREF1 and the upper reference voltage VREFn+AVREFn. Some selected gamma reference voltages GM1 and GM9 can be output through the buffer BUF.

[0093] Some gamma reference voltages GM1 and GM9 are distributed through a second resistor string RS2. The second resistor string RS2 can select other gamma reference voltages GM2 to GM8 from the distributed voltages, and outputs the selected gamma reference voltages GM2 to GM8 through a buffer BUF.

[0094] The third resistor string RS3 can distribute gamma reference voltages GM1 to GM9 and output gamma voltages GMA1 to GMAn corresponding to the entire grayscale. The generated gamma voltages GMA1 to GMAn can be supplied to DAC 340 and used to generate the data voltage Vdata.

[0095] In the aforementioned embodiment, a compensation circuit 361 and a reference voltage generator 360 can be provided for each of the pixels R, G, and B of different colors. In other words, compensation values ​​and reference voltages reflecting these compensation values ​​can be provided individually corresponding to the pixels R, G, and B of different colors. Therefore, different sets of gamma voltages are provided to the pixels R, G, and B of different colors, and the data voltage Vdata, which is compensated as a result, is generated independently of each other.

[0096] Figure 10 and Figure 11 This is a diagram used to describe the compensation method according to the implementation method.

[0097] As shown above (refer to the reference) Figure 8 and Figure 9 As described, the data driver 30' according to the embodiment compensates for the data voltage Vdata based on the APL of the image data RGB', wherein independent compensation values ​​corresponding to pixels R, G, and B of different colors are provided, along with reference voltages reflecting these independent compensation values. Therefore, as... Figure 10As shown, different compensation values ​​are applied to pixels of different colors R, G, and B respectively.

[0098] Such compensation values ​​are adaptively set for pixels R, G, and B with different voltage drops relative to the driving voltage ELVDD, so that the color coordinates based on APL are preserved after compensation without distortion relative to pixels R, G, and B, as shown below. Figure 11 As shown.

[0099] According to the implementation method, the display device compensates for the voltage drop of the high-potential driving voltage and reduces the brightness difference between pixels, thereby improving the display quality.

[0100] According to the implementation method, the display device solves the problem of color coordinate distortion when compensating for voltage drop of high potential driving voltage.

[0101] It will be apparent to those skilled in the art to which this disclosure pertains that this disclosure may be implemented in other specific forms without altering the technical concept or essential characteristics. Therefore, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit it in any way. The scope of this disclosure should be defined by the appended claims rather than the specific embodiments, and all changes and modifications derived from the meaning and scope of the appended claims and their equivalents should be construed as being included within the scope of this disclosure.

Claims

1. A display device, comprising: A display panel having multiple pixels of different colors arranged on it; A power supply configured to supply a high-potential drive voltage to the display panel; as well as A data driver is configured to calculate the average image level of the input image data and generate a data voltage based on a compensation value used to compensate for the voltage drop of the high-potential drive voltage based on the calculated average image level. The data driver includes: A reference voltage generator, which is configured to generate a reference voltage; A compensation circuit, configured to output the compensation value corresponding to the calculated average image level; and A gamma voltage generator configured to generate a gamma voltage based on a reference voltage to which the compensation value has been added or subtracted. The compensation circuit is configured to perform additive compensation by adding the compensation value to the reference voltage when the average image level increases, and to perform subtractive compensation by subtracting the compensation value from the reference voltage when the average image level decreases. The average image level refers to the average brightness of the brightest color in a frame of input image data. Specifically, the compensation value is set independently for each color. The compensation value is pre-stored in the memory of the display device, and the compensation value is generated by the display device detecting fluctuations in the high-potential drive voltage or received from outside the display device.

2. The display device according to claim 1, wherein, The data driver also includes: An average image level calculator, configured to calculate the average image level; A memory configured to store the compensation value based on the average image level; and A compensator is configured to generate a data voltage based on the compensation value corresponding to the calculated average image level.

3. The display device according to claim 2, wherein, The compensator is provided independently for each color.

4. The display device according to claim 1, wherein, The data driver also includes: A shift register configured to output a sampled signal in response to a data drive control signal output from a timing controller; A latch configured to sample the image data into a digital data signal in response to the sampling signal; as well as A digital-to-analog converter configured to convert the digital data signal into an analog data signal based on the gamma voltage, and to output the analog data signal as a data voltage.

5. The display device according to claim 1, wherein, The compensation circuit and the reference voltage generator are provided independently for each color.

6. The display device according to claim 5, wherein, The gamma voltage is provided to pixels of different colors as different sets of gamma voltages.

7. The display device according to claim 6, wherein, The data driver is configured to set a compensation value to decrease the data voltage when the calculated average image level increases, and to set a compensation value to increase the data voltage when the calculated average image level decreases.

8. A compensation method for a display device, wherein the display device contains a plurality of pixels of different colors, the compensation method comprising: Calculate the average image level of the input image data, wherein the average image level indicates the average brightness of the brightest color in a frame of input image data; The data voltage is generated based on a compensation value, which is used to compensate for the voltage drop of the high-potential drive voltage based on the calculated average image level. Specifically, the compensation value is set independently for each color. The compensation method further includes: Generate a reference voltage; Generate the compensation value corresponding to the calculated average image level; and The gamma voltage is generated based on a reference voltage to which the compensation value has been added or subtracted. Specifically, when the average image level increases, additive compensation is performed to add the compensation value to the reference voltage; and when the average image level decreases, subtractive compensation is performed to subtract the compensation value from the reference voltage. The compensation value is pre-stored in the memory of the display device, and the compensation value is generated by the display device detecting fluctuations in the high-potential drive voltage or received from outside the display device.

Images