KR20150011645A - Organic light emitting diode display device and method for driving the same - Google Patents

Abstract

The present invention relates to an organic light emitting diode display device and an operating method thereof capable of analyzing inputted image data in multiple frame units to extract changes in the temperature and deterioration degree of organic light emitting diodes into multiple blocks and performing deterioration compensation according to the extracted changes in the temperature and deterioration degree to improve the display quality of an image. The present invention comprises: an image display panel having a plurality of pixel areas; a gate operation unit for operating gate lines of the image display panel; a data operation unit for operating data lines of the image display panel; a power provision unit for applying a first and a second power signal for power lines of the image display panel; and a timing control unit for analyzing the image data inputted externally into multiple frame units to extract changes in the temperature and deterioration degree of the organic light emitting diodes and maintaining or renewing gradation values of the inputted image data into predetermined compensation values according to the extracted changes in the temperature and deterioration degree to compensate the deterioration.

Description

Technical Field [0001] The present invention relates to an organic light emitting diode (OLED) display device,

The present invention analyzes input image data in units of a plurality of frames and detects the temperature change and the degradation degree of the organic light emitting diodes for each of a plurality of blocks and performs deterioration compensation according to the detected temperature change and deterioration degree to improve the display quality of the image And an organic light emitting diode (OLED) display device and a driving method thereof.

2. Description of the Related Art In recent years, organic light emitting diodes (OLED) display devices for displaying images by controlling the amount of emitted light of an organic light emitting layer have been spotlighted in flat panel display devices, which are widely used.

In an OLED display device, a plurality of pixels are arranged in a matrix form to display an image. Here, each pixel includes an OLED and a pixel driver for independently driving the OLED, and the pixel driver adjusts the brightness of each pixel by adjusting the amount of current flowing in the OLED.

However, since the OLED is a self-luminous device, the deterioration is accelerated as the driving time increases, and the emission capability is reduced. Accordingly, the OLED display device has a problem that the degradation rate of the OLED differs from one pixel to another, and the luminance varies even when the same data voltage is applied. In order to overcome such a problem, a technique has been introduced in which a temperature sensing circuit is used to detect the temperature of the OLED panel to determine the degree of deterioration of the OLED panel, and the current amount is compensated according to the degree of deterioration.

However, since the temperature sensing compensation method according to the related art needs to further include a temperature sensing circuit and a compensation circuit for sensing the temperature, it is inevitable to increase the cost, and the detection temperature also depends on the characteristics of the display image and the size of the OLED display panel It was difficult to compensate the deterioration of the OLED. In addition, the temperature unbalance state may be generated and maintained for each display region of the OLED display panel depending on the display characteristics of the OLED display panel or the large-screen image on the large screen.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for analyzing input image data in units of a plurality of frames to detect the temperature change and the degree of deterioration of the organic light emitting diodes for each of a plurality of blocks, And an organic light emitting diode (OLED) display device capable of improving the display quality of an image by performing compensation.

According to an aspect of the present invention, there is provided an organic light emitting diode display including an image display panel having a plurality of pixel regions, a gate driver for driving gate lines of the image display panel, A power supply unit for applying first and second power supply signals to the power supply lines of the image display panel, a power supply unit for analyzing input image data from the outside in units of a plurality of frames, And a timing controller for detecting the deterioration degree for each of a plurality of blocks and for performing deterioration compensation by maintaining or updating gradation values of the input image data with a preset compensation value according to the detected temperature change and deterioration degree, do.

Wherein the timing controller divides the input image data into a plurality of blocks to detect an average picture level (APL) and an average temperature level (ATL) of the block-by-block image data, A data compensation processing unit for maintaining or updating gradation values of the input image data by using a preset compensation value to generate compensation data, a control unit for controlling the driving timing of the gate driving unit 2 using at least one of synchronous signals from outside And a data control unit for generating and outputting a data control signal for controlling the driving timing of the data driving unit using at least one of the synchronization signals, And a signal generator.

Wherein the data compensation processing unit comprises: a data arrangement unit for storing the input image data in units of frames and dividing the input image data into a plurality of predetermined blocks and sequentially outputting the image data for each block in units of at least one horizontal line; An APL analyzing unit for sequentially detecting APLs of data and accumulating the detected APLs in units of a predetermined plurality of frames to generate a cumulative average APL for each block; An ATL analyzing unit for accumulating the accumulated average APL and cumulative average ATL for each block to generate a cumulative average ATL for each block, and determining the temperature and the degree of deterioration for each block of the current image display panel according to the cumulative average APL and cumulative average ATL for each block, Based on the input temperature and the degree of deterioration, Depending on the comparison result of the luminance data to maintain or update the gray level of the input image data to a preset compensation value is characterized by comprising a deterioration compensating for generating the compensation data.

The degradation compensation unit determines the temperature of each block of the current image display panel according to the cumulative average APL for each block and the cumulative average ATL for each block to determine whether the temperature of each block of the current image display panel is higher or lower than the target temperature The input image data gradation level and luminance are varied and compensated to be equal to a reference data gradation level and luminance corresponding to the target temperature to generate the compensation data.

The deterioration compensator calculates a luminance value corresponding to a gradation level and a luminance of the input image data and a reference data gradation level and a luminance difference according to the target temperature using at least one look-up table, And the compensation data is generated by maintaining or updating the grayscale values of the input image data with the compensation values previously set and stored correspondingly.

According to another aspect of the present invention, there is provided a method of driving an organic light emitting diode display, including driving gate lines of an image display panel having a plurality of pixel regions, Driving the data lines, applying first and second power supply signals to the power supply lines of the image display panel, analyzing input image data from the outside in units of a plurality of frames, And performing deterioration compensation by maintaining or updating gradation values of the input image data with a preset compensation value according to the detected temperature change and deterioration degree.

Wherein the deterioration compensation step divides the input image data into a plurality of blocks to detect an average picture level (APL) and an average temperature level (ATL) of each block, Generating compensation data by maintaining or updating gradation values of the input image data with a preset compensation value using the result, controlling the driving timing of the gate driver using at least one of synchronous signals from outside And generating and outputting a data control signal for controlling the driving timing of the data driver using at least one of the synchronization signals.

Wherein the step of generating the compensation data comprises the steps of storing the input image data in units of frames and dividing the input image data into a plurality of predetermined blocks and outputting the image data for each block sequentially in units of at least one horizontal line, Sequentially accumulating the detected APLs in units of a predetermined plurality of frames to generate a cumulative average APL for each block, sequentially detecting ATLs of the video data for each block, Accumulating average ATL for each block, and determining the temperature and the degree of deterioration for each block of the current image display panel according to the cumulative average APL and the cumulative average ATL for each block, Based on the input image data and the luminance of the reference data according to the preset target temperature And generating the compensation data by maintaining or updating the tone values of the input image data with a compensation value set in advance according to the comparison result.

The compensation data generation step may include a step of determining a temperature for each block of the current image display panel according to the cumulative average APL for each block and the cumulative average ATL for each block to determine whether the temperature of each block of the current image display panel is higher than the target temperature And the compensation data is generated by varying and compensating the input image data gradation level and the luminance so as to become equal to the reference data gradation level and luminance according to the target temperature.

Wherein the compensation data generation step uses at least one look-up table to calculate a gradation level and a luminance of the input image data, a luminance value corresponding to a reference data gradation level and a luminance difference according to the target temperature, And the compensation data is generated by maintaining or updating the tone values of the input image data with the compensation value that is set and stored in advance in correspondence with the value of the compensation value.

The organic light emitting diode display device and the driving method thereof according to the present invention divide input image data into a plurality of blocks and analyze image data of each block in units of a plurality of frames to more accurately detect temperature change and deterioration degree of the organic light emitting diodes can do.

In addition, the image data compensation value is preset and stored according to the experimental result corresponding to the temperature change and the deterioration degree, and the tone value of the input image data is set to a preset compensation value according to the temperature change and the deterioration degree detected for each of the plurality of blocks The display quality of the image can be further improved.

1 is a configuration diagram of an OLED display device according to an embodiment of the present invention;
2 is a configuration diagram specifically showing the timing control unit shown in Fig.
FIG. 3 is a block diagram specifically showing the data compensation processing unit shown in FIG. 2. FIG.
4 is a view showing an example of block sorting and division of the data sorting unit shown in FIG.
5 is a graph for explaining a compensation data setting method of the deterioration compensating unit shown in FIG.
6 is a diagram illustrating a method of extracting and generating compensation data using the look-up table of the degradation compensation unit shown in FIG.

Hereinafter, an organic light emitting diode (OLED) display device and a driving method thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of an OLED display device according to an embodiment of the present invention.

1 includes an image display panel 1 formed with a plurality of pixel regions, a gate driver 2 driving gate lines GL1 through GLn of the image display panel 1, A data driver 3 for driving the data lines DL1 to DLm of the display panel 1 and a first and a second power supply signals VDD and GND to the power supply lines PLn to PLm of the image display panel The power supply unit 4 analyzes input image data (RGB) from the outside in units of a plurality of frames, detects the temperature change and the degree of deterioration of the organic light emitting diodes for each of a plurality of blocks, And a timing controller 5 for performing the deterioration compensation by maintaining or updating the gray level values of the input image data RGB with the compensation value set.

In the image display panel 1, a plurality of sub-pixels P are arranged in a matrix form in each pixel region to display an image. Each sub-pixel P independently drives the organic light emitting diode and the organic light emitting diode And a diode driver circuit. More specifically, one subpixel P is a diode driver circuit connected to a gate line GL, a data line DL, and a power supply line PL, and between the diode drive circuit and the second power supply signal GND And a connected organic light emitting diode.

The diode driving circuits supply the analog data signals from the data lines DL connected to the organic light emitting diodes, respectively, so that the analog data signals are charged to maintain the light emitting state.

The gate driver 2 receives the gate control signal GVS from the timing controller 5 in response to a Gate Start Pulse (GSP) and a Gate Shift Clock (GSC) And controls the pulse width of the gate-on signal in accordance with a gate output enable (GOE) signal. Then, the gate-on signals are sequentially supplied to the gate lines GL1 to GLn. Here, the gate-off voltage is supplied during a period in which the gate-on voltage is not supplied to the gate lines GL1 to GLn.

The data driver 3 is connected to the timing controller 5 using a source start pulse SSP and a source shift clock SSC among data control signals DVS from the timing controller 5. [ That is, the analog video signal, from the compensation data MData modulated on a frame-by-frame basis. In response to a source output enable (SOE) signal, a video signal is supplied to each of the data lines DL1 to DLm. Specifically, the data driver 3 latches the compensation data (MData) input according to the SSC, and then, in response to the SOE signal, supplies a scan pulse to each of the gate lines (GL1 to GLn) To each of the data lines DL1 to DLm.

The power supply unit 4 supplies a first power supply signal VDD and a second power supply signal GND to the image display panel 1. Here, the first power supply signal VDD denotes a driving voltage for driving the light emitting cell OEL, and the second power supply signal GND denotes a ground voltage or a low voltage. The current corresponding to the video signal flows in each sub-pixel P due to the difference between the first power source signal VDD and the second power source signal GND.

The timing controller 5 divides the input image data RGB from the outside into a plurality of blocks and detects the temperature change and the degree of deterioration of the organic light emitting diodes on a frame-by-frame basis. Then, the compensation data (MData) is generated by maintaining or updating the tone values of the input image data (RGB) with preset compensation values according to the detected temperature change and deterioration degree of each block.

In addition, the timing controller 5 aligns the compensation data MData so as to be suitable for driving the image display panel 1, and supplies the data to the data driver 3. The timing controller 5 generates gate and data control signals GVS and DVS using externally input synchronous signals Dclk, DE, Hsync and Vsync and supplies them to the gate driver 2 and the data driver 3 to control the gate and data driver 3,2.

2 is a block diagram specifically showing the timing control unit shown in FIG.

The timing controller 5 shown in FIG. 2 divides the input image data RGB into a plurality of blocks, detects APL (Average Picture Level) and ATL (Average Temperature Level) of each block, A data compensation processing unit 12 for holding or updating the gradation values of the input image data RGB with preset compensation values using the cumulative results of APL and ATL to generate compensation data MData, A gate control signal generation unit 14 for generating and outputting a gate control signal GVS for controlling the driving timing of the gate driving unit 2 using at least one of signals Dclk, DE, Hsync, and Vsync, A data control signal generator 16 for generating and outputting a data control signal DVS for controlling the driving timing of the data driver 3 using at least one of signals Dclk, DE, Hsync, and Vsync, Respectively.

The data compensation processing unit 12 stores input image data (RGB) from the outside in units of frames and divides the image data into a plurality of preset blocks. Then, the APLs of the divided image data B_RGB of each block are sequentially detected and accumulated in units of a predetermined number of frames to generate an accumulated average APL for each block. In addition, the data compensation processing unit 12 sequentially detects the ATLs of the image data B_RGB of each block, accumulates the ATLs in units of a predetermined number of frames, and generates an average ATL for each of the accumulated blocks. The temperature and the deterioration degree of each block of the current image display panel 1 are determined according to the accumulated average APL and ATL of the respective blocks and the target temperature. Based on the determined temperature, the input image data RGB and the target temperature The compensation data (MData) is generated by maintaining or updating the gray level values of the input image data (RGB) with a compensation value set in advance according to the luminance comparison result of the reference data according to the comparison result. The compensation data MData thus generated are sequentially supplied to the data driver 3 in units of at least one horizontal line. The data compensation processing unit 12 for performing such operations will be described in detail later with reference to the accompanying drawings.

The gate control signal generator 14 may use at least one of the input synchronizing signals Dclk, DE, Hsync and Vsync, for example, a data enable signal DE and a horizontal synchronizing signal Hsync And generates and outputs gate control signals (GVS) for controlling the driving timing of the gate driver (2).

The data control signal generating unit 16 generates at least one of the input synchronizing signals Dclk, DE, Hsync and Vsync by using a data enable signal DE and a vertical synchronizing signal Vsync, And generates and outputs data control signals (DVS) for controlling the driving timing of the driving unit (3).

3 is a block diagram specifically illustrating the data compensation processing unit shown in FIG.

The data compensation processing unit 12 of FIG. 3 stores the input image data RGB in units of frames, divides the input image data into a plurality of predetermined blocks, sequentially outputs the image data B_RGB for each block in units of at least one horizontal line An APL analyzing unit 21 for sequentially detecting the APLs of the image data B_RGB of each block and accumulating the detected APLs in units of a predetermined plurality of frames to generate a cumulative average APL B_APL for each block An ATL analyzing unit 23 for sequentially detecting the ATLs of the image data B_RGB of each block and accumulating them in units of a predetermined number of frames to generate a cumulative average ATL (B_ATL) for each block, The temperature and deterioration degree of each block of the current image display panel 1 is determined according to the cumulative average APL (B_APL) and the ATL (B_ATL), and based on the determined temperature and the degree of deterioration, Set rider To maintain or update the value of the reference gradation according to the brightness comparison result of the data input to the pre-set compensation value image data (RGB) according to the temperature and a compensation data (MData) deterioration compensating unit (24) for generating.

4 is a diagram illustrating an example of block sorting and segmentation of the data sorting unit shown in FIG.

The data sorting unit 21 of FIG. 4 stores input image data RGB from the outside in units of frames and divides the data into a plurality of blocks A to P set in advance. Then, the divided image data B_RGB of each block are sequentially supplied to the APL analyzing unit 22 and the image data B_RGB of each block is supplied to the deterioration compensating unit 24 in units of at least one horizontal line . Here, the number and size of the blocks A to P for dividing the input image data RGB are set in advance according to the size and resolution of the image display panel 1 to be applied to the product.

The APL analyzing unit 22 sequentially detects APLs, which are average gradation values of image data (B_RGB) for each block input from the data arranging unit 21, and sequentially accumulates the APL values of the detected blocks in units of a predetermined plurality of frames And generates a cumulative average APL (B_APL) for each block by calculating an average value. In general, the temperature of each block of the image display panel 1 does not change immediately according to the currently displayed image. Since the temperature for each block of the image display panel 1 gradually changes according to the degree of image change (APL Moving Average) in a plurality of frame periods, the cumulative average APL (B_APL) for each block accumulated in units of a plurality of frames is detected and used. Here, a plurality of accumulated frames may be set in units of the previous 10 frames including the current frame. In this case, the APL analyzing unit 22 detects the cumulative average APL (B_APL) for each block of 10 frames in units of at least one frame and supplies it to the deterioration compensating unit 24 and the ATL analyzing unit 23.

The APL analyzing unit 22 sequentially detects ATLs for each block using the image data B_RGB of each block and the cumulative average APLs B_APL for each block from the APL analyzing unit 22, Are accumulated in units of a predetermined number of frames and an average value is calculated to generate a cumulative average ATL (B_ATL) for each block. Here, ATL for each block can be detected using the following equation (1).

[Equation 1]

ATL (° C.) = Offset + (Tr × R + Tg × G + Tb × B) × (Max Temperature-Offset)

Here, the offset is the image display panel temperature (the lowest temperature) at the time of driving the black image, and the Max temperature is the image display panel temperature at the time of driving the white image (R = 255 tones, G = 255 tones, B = 255 tones) (Maximum temperature). In addition, Tr + Tg + Tb in the above equation (1) is the contribution of red (R), green (G) and blue (B) in each gray level as "1". Each R, G, and B value can be a tone / 255 value.

5 is a graph for explaining a compensation data setting method of the deterioration compensator shown in FIG. 6 is a diagram illustrating a method of extracting and generating compensation data using the look-up table of the degradation compensation unit shown in FIG.

5, the degradation compensation unit 24 compares the cumulative average APL (B_APL) for each block supplied from the APL analyzer 22 and the cumulative average ATL (B_APL) for each block supplied from the ATL analyzer 24 The temperature and deterioration degree of each block of the current image display panel 1 is determined according to the B_ATL. Based on the determined temperature and the degree of deterioration, the gradation value (RGB) of the input image data (RGB) is set to a preset compensation value according to the comparison result of the input image data RGB and the reference data according to the preset target temperature To generate compensation data (MData).

More specifically, the deterioration compensating unit 24 compares the temperature of each block of the current image display panel 1 with a cumulative average APL (B_APL) for each block and a cumulative average ATL (B_ATL) 35 deg. C, 40 deg. C, 45 deg. C shown in Fig. 5). If it is determined that the temperature of each block of the current image display panel 1 is 40 ° C, 45 ° C, or 25 ° C higher or lower than the target temperature (Target 35 ° C), the input image data (RGB) The compensation data (MData) is generated by compensating the luminance to be close to the reference data gradation level and luminance according to the target temperature (Target 35 ° C).

6, when the temperature of each block of the current image display panel 1 is determined to be higher or lower than the target temperature (Target 35 ° C), the deterioration compensating unit 24 compares at least one look- (L, L = (T-Tref)) corresponding to the difference between the gradation level and the luminance of the input image data (RGB) and the reference data gradation level and the luminance (b) ) + b), and generates compensation data (MData) by maintaining or updating the grayscale values of the input image data (RGB) with the compensation values set and stored in advance corresponding to the calculated luminance values.

Here, a of the look-up table (LUT) shown in FIG. 6 corresponds to the slope of the graph shown in FIG. 6 as a luminance change value according to a temperature change at an arbitrary gradation. And b can be the target luminance of the input image data (RGB) as the luminance value at the target temperature Tref for each gradation. In particular, the a and b values are data values previously set and stored by experiments, and can be a tone value corresponding to the target luminance based on the temperature data according to the cumulative average ATL (B_ATL) for each block. Thereafter, the deterioration compensating unit 24 sequentially arranges the compensation data MData in accordance with the size and resolution of the image display panel 1, and supplies the compensation data MData to the data driver 3 in units of at least one horizontal line, ) Can be displayed as an image.

As described above, the organic light emitting diode display device and the driving method thereof according to the present invention divide input image data (RGB) into a plurality of blocks, analyze image data of each block in units of a plurality of frames, The temperature change and the degree of deterioration can be detected more accurately. The image data compensation value is previously set and stored according to the experimental result corresponding to the temperature change and the deterioration degree, and the gradation values of the input image data are set to a preset compensation value according to the temperature change and the deterioration degree detected for each of the plurality of blocks The display quality of the image can be further improved.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

1: Video display panel 2: Gate driver
3: Data driver 4: Power supply
5: timing control unit 12: data compensation processing unit
14: Gate control signal generator 16: Data control signal generator
21: data sorting unit 22: APL analyzing unit
23: ATL analysis section 24: deterioration compensation section
LUT: Lock-up table

Claims (10)

A video display panel formed with a plurality of pixel regions,
A gate driver for driving gate lines of the image display panel,
A data driver for driving the data lines of the image display panel,
A power supply unit for applying first and second power supply signals to power supply lines of the image display panel,
The method comprising the steps of: analyzing input image data from the outside in units of a plurality of frames to detect a temperature change and a deterioration degree of the organic light emitting diodes for each of a plurality of blocks, And a timing controller for performing the deterioration compensation by maintaining or updating the values of the currents. The method according to claim 1,
The timing control unit
(APL) and an ATL (Average Temperature Level) of the image data for each block by dividing the input image data into a plurality of blocks, A data compensation processor for generating compensation data by maintaining or updating gray level values of the input image data with a compensation value,
A gate control signal generator for generating and outputting a gate control signal for controlling the driving timing of the gate driver using at least one of synchronous signals from outside,
And a data control signal generator for generating and outputting a data control signal for controlling the driving timing of the data driver using at least one of the synchronization signals. 3. The method of claim 2,
The data compensation processing unit
A data arrangement unit for storing the input image data in units of frames and dividing the input image data into a plurality of predetermined blocks and sequentially outputting the image data for each block in units of at least one horizontal line;
An APL analyzing unit for sequentially detecting APLs of the image data for each block and accumulating the detected APLs in units of a predetermined plurality of frames to generate a cumulative average APL for each block;
An ATL analyzing unit for sequentially detecting ATLs of the image data for each block and accumulating the ATLs for a predetermined plurality of frames to generate a cumulative average ATL for each block;
Wherein the temperature and the degree of deterioration of each block of the current image display panel are determined according to the cumulative average APL and the cumulative average ATL of each block, and based on the determined temperature and the degree of deterioration, And a deterioration compensating unit for maintaining or updating the gray level values of the input image data with a preset compensation value according to a luminance comparison result of the reference data to generate the compensation data. The method of claim 3,
The degradation compensation unit
The temperature of each block of the current image display panel is determined according to the cumulative average APL for each block and the cumulative average ATL for each block and if the temperature of each block of the current image display panel is determined to be higher or lower than the target temperature, Wherein the compensation data is generated by varying and compensating the image data gradation level and the luminance so as to be equal to the reference data gradation level and luminance according to the target temperature. 5. The method of claim 4,
The degradation compensation unit
Calculating a luminance value corresponding to a gradation level and a luminance of the input image data and a reference data gradation level and a luminance difference according to the target temperature using at least one look-up table,
And the compensation data is generated by maintaining or updating the gray level values of the input image data with the compensation value previously set and stored corresponding to the calculated luminance value. Driving gate lines of an image display panel having a plurality of pixel regions,
Driving data lines of the image display panel,
Applying first and second power signals to power lines of the image display panel,
The method comprising the steps of: analyzing input image data from the outside in units of a plurality of frames to detect a temperature change and a deterioration degree of the organic light emitting diodes for each of a plurality of blocks, And performing deterioration compensation by maintaining or updating the values of the currents. The method according to claim 6,
The deterioration compensation performing step
(APL) and an ATL (Average Temperature Level) of the image data for each block by dividing the input image data into a plurality of blocks, Generating compensation data by maintaining or updating gradation values of the input image data with a compensation value,
Generating and outputting a gate control signal for controlling the driving timing of the gate driver using at least one of synchronous signals from outside,
And generating and outputting a data control signal for controlling the driving timing of the data driver using at least one of the synchronization signals. 8. The method of claim 7,
The compensation data generation step
Storing the input image data in units of frames, dividing the divided input image data into a plurality of predetermined blocks, sequentially outputting the image data for each block in units of at least one horizontal line,
Sequentially detecting APLs of the image data for each block and accumulating the detected APLs in units of a predetermined plurality of frames to generate a cumulative average APL for each block;
Sequentially detecting the ATLs of the image data for each block and accumulating the ATLs in units of a predetermined plurality of frames to generate a cumulative average ATL for each block;
Wherein the temperature and the degree of deterioration of each block of the current image display panel are determined according to the cumulative average APL and the cumulative average ATL of each block, and based on the determined temperature and the degree of deterioration, And maintaining or updating the gray level values of the input image data with a compensation value that is preset according to a luminance comparison result of the reference data to generate the compensation data. 9. The method of claim 8,
The compensation data generation step
The temperature of each block of the current image display panel is determined according to the cumulative average APL for each block and the cumulative average ATL for each block and if the temperature of each block of the current image display panel is determined to be higher or lower than the target temperature, Wherein the compensating data is generated by varying and compensating the image data gradation level and the luminance so as to be equal to the reference data gradation level and luminance according to the target temperature. 10. The method of claim 9,
The compensation data generation step
Calculating a luminance value corresponding to a gradation level and a luminance of the input image data and a reference data gradation level and a luminance difference according to the target temperature using at least one look-up table,
And the compensation data is generated by maintaining or updating the gray level values of the input image data with the compensation value set and stored in advance corresponding to the calculated luminance value.

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