KR20200080783A - Organic light emitting diode display device - Google Patents

Abstract

The present invention relates to an organic light emitting diode display device capable of preventing visibility of a sensing line in real-time by varying recovery data according to a frame rate, wherein a timing controller of the OLED display device according to one embodiment selects any one sensing line in the sensing period among the vertical blank periods of a frame through a panel driver, performs a sensing operation to sense the characteristics of each subpixel belonging to the selected sensing line, and performs a recovery operation of supplying recovery data to each subpixel of the sensing line in a recovery period after a sensing period, and the recovery data may be varied according to a frame rate change.

Description

Organic light emitting diode display device {ORGANIC LIGHT EMITTING DIODE DISPLAY DEVICE}

The present invention relates to an organic light emitting diode display device capable of preventing a real-time sensing line from being viewed by varying recovery data according to a frame rate.

The display device includes a liquid crystal display using liquid crystal, an organic light emitting diode (OLED) display using an organic light emitting diode, and an electrophoretic display using electrophoretic particles.

Of these, the OLED display is a self-luminous device that emits an organic light emitting layer by recombination of electrons and holes, and has a high luminance, a low driving voltage, and is capable of ultra-thinning as well as a free shape.

Each sub-pixel constituting the OLED display includes an OLED element and a pixel circuit that independently drives the OLED element. The pixel circuit adjusts the brightness of the OLED device by adjusting the current (Ids) at which the driving thin film transistor (TFT) drives the OLED device according to the driving voltage Vgs corresponding to the data signal.

OLED displays have sub-pixel characteristics that are non-uniform due to threshold voltage (hereinafter Vth), mobility, etc., depending on process variations, driving environment, driving elapsed time, etc., resulting in current (Ids) compared to driving voltage (Vgs) of the same gradation. Since it varies, luminance unevenness may occur. To solve this, the OLED display mainly uses an external compensation method that senses the characteristics of the sub-pixels and compensates for variations in characteristics between the sub-pixels based on the sensing result.

For the real-time sensing, the mobility characteristics of the driving TFT sensitive to the driving environment in the external compensation method use a real-time (hereinafter, RT) sensing method that selects one line for each vertical blank period of each frame and senses subpixels of the selected line.

Each vertical blank section includes an RT sensing section and a recovery section in which subpixels sensed before the active section after RT sensing recharge the recovery data to restore the previous display operation state. The recovery data is determined such that the difference in luminance between the sensing line and the non-sensing line is not recognized.

However, when the frame rate for varying the driving frequency is varied in the OLED display device, each vertical blank period is variable, and thus, the charging time of the recovery data is varied in the recovery section, resulting in luminance deviation between the sensing line and the non-sensing line. Therefore, there is a problem that the RT sensing line is recognized.

The present invention provides an organic light emitting diode display device capable of preventing a real-time sensing line from being viewed by varying recovery data according to a frame rate.

The timing controller of the OLED display device according to an embodiment may perform a sensing operation of sensing characteristics of each subpixel belonging to the selected sensing line by selecting any one sensing line in the sensing period from among the vertical blank periods of the frame through the panel driver. In the recovery period after the sensing period, a recovery operation of supplying recovery data to each subpixel of the sensing line is performed, and the recovery data may be varied according to a variable frame rate. In other words, the recovery data may vary depending on the length of the vertical blank period. Also, the recovery data may be changed according to the position of the sensed line.

The recovery data may decrease as the frequency of the frame rate decreases, and increase as the frequency of the frame rate increases.

The recovery data may decrease as the vertical blank period increases, and increase as the vertical blank period decreases.

The timing controller may count the vertical blank period using the horizontal synchronization signal and change the recovery data using the count value.

The timing controller may compensate the recovery data by selecting a compensation value corresponding to the count value from the lookup table.

The recovery data may increase as the scan order of the active period is faster in the panel for the sensing line, and decrease as the scan order is slow.

OLED display device according to an embodiment of the present invention by varying the compensation value applied to the recovery data according to the variation of the vertical blank period according to the frame rate, by varying the charging time of the recovery data in the vertical blank period when the frame rate is varied It is possible to prevent the RT sensing line from being recognized by compensating for the luminance deviation caused.

OLED display device according to an embodiment of the present invention by varying the compensation value of the recovery data according to the position of the RT sensing line due to the difference in charging time difference of the source image data and the charging time difference of the recovery data according to the position of the RT sensing line By further compensating for the luminance deviation, the sensing line can be prevented from being viewed.

1 is a block diagram schematically showing the configuration of an OLED display device according to an embodiment of the present invention.
2 is an equivalent circuit diagram illustrating a pixel circuit according to an embodiment of the present invention.
3 is a timing diagram illustrating an RT sensing method of an OLED display device according to an embodiment of the present invention.
4 is a waveform diagram showing RT sensing and recovery driving according to a vertical synchronization signal of a first frame rate according to an embodiment of the present invention.
5 is a waveform diagram showing RT sensing and recovery driving according to a vertical synchronization signal of a second frame rate according to an embodiment of the present invention.
6 is a flowchart illustrating a method for compensating for recovery data according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram schematically showing a configuration of an OLED display device according to an embodiment of the present invention, and FIG. 2 is an equivalent circuit diagram illustrating one pixel circuit according to an embodiment of the present invention.

Referring to FIG. 1, an OLED display device according to an embodiment includes a panel 100, a gate driver 200, a data driver 300, a timing controller 400, a memory 500, and a gamma voltage generator 600 , Power supply 700 and the like.

The power supply unit 700 generates and outputs various driving voltages required for driving the OLED display using the input voltage. For example, the power supply unit 700 is a driving voltage of the digital circuit supplied to the data driver 300 and the timing controller 400, the driving of the analog circuit supplied to the data driver 300, the gamma voltage generator 600, etc. The voltage, a gate-on voltage (VGH) and a gate-off voltage (VGL) used in the gate driver 200 are generated and supplied. The power supply unit 700 further generates a plurality of driving voltages EVDD and EVSS required for driving the panel 100 and a reference voltage Vref and supplies them to the panel 100 through the data driver 300.

The panel 100 displays an image through a pixel array in which subpixels P are arranged in a matrix form. The basic pixel may be composed of 2, 3, or 4 color subpixels among white (W), red (R), green (G), and blue (B) subpixels.

The sub-pixels P arranged in the X-axis and Y-axis directions constitute a plurality of horizontal lines and a plurality of column lines. The subpixels P of each horizontal line arranged in the X-axis direction are commonly connected to the scan gate line GLsc and the sense gate line GLse. The subpixels P of each column arranged in the Y-axis direction are commonly connected to each data line DL. The subpixels P of each column or a plurality of columns may be commonly connected to the reference line RL and the power supply line PL. For example, as illustrated in FIG. 1, four columns of subpixels P may be commonly connected to the reference line RL, and two columns of subpixels P may be commonly connected to the power line PL. have.

Each sub-pixel P includes an OLED element (light emitting element) and a pixel circuit that independently drives the OLED element. For example, referring to FIG. 2, each subpixel P has first and second switching TFTs ST1 and ST2 and a driving TFT DT and a storage capacitor (for driving the OLED element 10 independently) Cst). Meanwhile, since the pixel circuit is various in addition to the configuration of FIG. 2, various configurations may be applied.

As the switching TFT (ST1, ST2) and the driving TFT (DT), an amorphous silicon (a-Si) TFT, a poly-silicon TFT, an oxide TFT, or an organic TFT can be used. have.

The OLED element 10 includes an anode connected to the source node N2 of the driving TFT DT, a cathode to which a low potential power signal EVSS is supplied, and an organic light emitting layer between the anode and the cathode. The anode is independent for each subpixel, but the cathode is a common electrode shared by all subpixels. In the OLED device 10, when current is supplied from the driving TFT DT, electrons from the cathode are injected into the organic light emitting layer, holes from the anode are injected into the organic light emitting layer, and fluorescence or phosphorescence is caused by recombination of electrons and holes in the organic light emitting layer. By emitting a material, light having a brightness proportional to the magnitude of the current is generated.

The first switching TFT ST1 is driven by the scan gate pulse SCAN supplied from the gate driver 200 to the scan gate line GLsc, and supplied from the data driver 300 to the data line DL. The data signal Vdata is supplied to the gate node N1 of the driving TFT DT.

The second switching TFT ST2 is driven by the sensing gate pulse SENSE supplied from the gate driver 200 to the sensing gate line GLse, and supplied from the data driver 300 to the reference line RL. The reference voltage Vref is supplied to the source node N2 of the driving TFT DT. The second switching TFT ST2 is further used as a current path for flowing current through the source node N2 of the driving TFT DT to the reference line RL in the sensing mode.

The first and second switching TFTs ST1 and ST2 may be controlled by different gate lines GLsc and GLse as shown in FIG. 2 or may be controlled by the same gate line.

The storage capacitor Cst connected between the gate node N1 and the source node N2 of the driving TFT DT is a gate node N1 and a source node (through the first and second switching TFTs ST1, ST2). The difference voltage between the data signal Vdata and the reference voltage Vref supplied to N2) is charged and supplied to the driving voltage Vgs of the driving TFT DT.

The driving TFT DT controls the current supplied from the power supply line PL supplying the high potential power signal EVDD according to the driving voltage Vgs, and supplies the controlled current to the OLED device 10 to provide the OLED device ( 10) to emit light.

The gate driver 200 and the data driver 300 connected to the panel 100 may be defined as a panel driver.

The gate driver 200 receives a plurality of gate control signals from the timing controller 400 and operates a shift register to individually drive the gate lines of the panel 100. The gate driver 200 supplies the gate pulse of the gate-on voltage VGH to the corresponding gate line during the driving period of each gate line, and supplies the gate-off voltage VGL to the corresponding gate line during the non-driving period of each gate line. do.

The gate driver 200 includes a scan shift register 210 driving a plurality of scan gate lines GLsc1 to GLsc(n) of the panel 100 and a plurality of sense gate lines GLse1 to GLse(n). It may include a sense shift register 220 to drive the.

The gamma voltage generator 600 generates a plurality of reference gamma voltages having different voltage levels and supplies them to the data driver 300. The gamma voltage generator 600 may generate a plurality of reference gamma voltages corresponding to gamma characteristics of the display device under control of the timing controller 400 and supply them to the data driver 300. The gamma voltage generator 600 may receive gamma data from the timing controller 400 and adjust the reference gamma voltage level according to the gamma data to output the gamma voltage to the data driver 300. The gamma voltage generator 600 may adjust the high potential voltage according to the peak luminance control of the timing controller 400 and output it to the data driver 300.

The data driver 300 converts the data supplied from the timing controller 400 into an analog data signal according to the data control signal supplied from the timing controller 400, thereby converting a plurality of data lines DL1 to DLm of the panel 100. Supply to each. In this case, the data driver 300 subdivides a plurality of reference gamma voltages supplied from the gamma voltage generator 600 into a plurality of gamma voltages, and converts digital data into analog data signals using the subdivided gamma voltages.

The data driver 300 may convert image data, sensing data, and recovery data supplied from the timing controller 400 into corresponding data voltage signals and supply them to each of the plurality of data lines DL1 to DLm.

The data driver 300 supplies the reference voltage Vref supplied from the power supply unit 700 to a plurality of reference lines RL1 to RLk of the panel 100 under the control of the timing controller 400. The data driver 300 may supply the reference voltage Vref separately for display and sensing under the control of the timing controller 400.

The timing controller 400 receives image data and timing control signals from the host system. The host system may be any one of a system of a portable terminal such as a computer, a TV system, a set top box, a tablet or a mobile phone. The timing control signals may include a dot clock, a data enable signal DE, a vertical synchronization signal Vsync, and a horizontal synchronization signal Hsync. The timing controller 400 generates a plurality of data control signals that control the driving timing of the data driver 300 using the timing control signals supplied from the host system and the timing setting information stored therein, so that the data driver 300 , And generates a plurality of gate control signals that control driving timing of the gate driver 200 and supplies them to the gate driver 200.

The timing controller 400 may perform various image processing for image data deterioration compensation, image quality correction, etc., and analyze image data to control image luminance to reduce power consumption.

The timing controller 400 compensates for image data, sensing data (sensing mode), and recovery data (RT sensing mode) by applying compensation values for characteristic deviations of each subpixel stored in the memory 500 and compensated Data is supplied to the data driver 300. The memory 500 stores compensation information for each subpixel including a Vth characteristic of the driving TFT DT for each subpixel, a Vth compensation value for compensating for mobility deviation, and a mobility compensation value.

The timing controller 400 may control the OLED display to operate in a sensing mode in order to update the compensation value stored in the memory 500. In the sensing mode, the timing controller 400 controls the gate driver 200 and the data driver 300 to drive the panel 100 in the sensing mode, and through the data driver 300, each sub-pixel of the panel 100 ( The characteristic of P) may be sensed and the compensation value of each subpixel stored in the memory 500 may be updated using the sensing result.

The sensing mode of the OLED display is the Real Time Fast (RF) sensing mode operating at power-on time, the RT (Real Time) sensing mode operating at the vertical blank period of each frame during the display period, and the RS (Real) operating at power-off time. time Slow) may include at least one of sensing modes. In addition, the sensing mode of the OLED display may be performed according to the needs of the timing controller 400 or the host system, and may be performed by a user request through the host system.

The timing controller 400 senses the mobility of the driving TFT (DT) affected by the driving environment (illuminance, temperature) in the RF sensing mode and the RT sensing mode, and compensates the mobility stored in the memory 500 using the sensing result The value can be updated. The timing controller 400 may sense the Vth change amount of the driving TFT shifted according to the accumulation of stress in the RS sensing mode and update the Vth compensation value stored in the memory 500 using the sensing result.

When in the RT sensing mode, the timing controller 400 may select and sense one pixel line for each vertical blank period as illustrated in FIG. 3, and restore the previous image display state after sensing. In the RT sensing mode performed in the vertical blank section, the timing controller 400 outputs sensing data in the RT sensing section and outputs recovery data in the recovery section.

The recovery data may include image data before sensing and a compensation value for compensating for a relatively reduced luminance by RT sensing operation. In particular, the compensation value of the recovery data is a compensation value for compensating for the difference in charging (holding) time of the image data and the charging (holding) time difference of the recovery data so that the RT sensing line is not visible. It can contain. The recovery data may further include a compensation value for compensating for a luminance difference between the sensing line and the non-sensing line. In particular, the compensation value of the recovery data may further include an offset value for compensating for a difference in charging (holding) time of the recovery data due to a change in the vertical blank time when the frame rate is varied. A detailed description thereof will be described later.

3 is a timing diagram illustrating an RT sensing method of an OLED display device according to an embodiment of the present invention, and FIGS. 4 and 5 illustrate RT sensing and recovery operations according to variable frame rates according to an embodiment of the present invention It is a timing chart to do.

Each frame (N, N+1, N+2) includes an active period and a vertical blank period. Under the control of the timing controller 400, the gate driver 200 and the data driver 300 sequentially writes image data to each subpixel while sequentially scanning n pixel lines in an active period. Under the control of the timing controller 400, the gate driver 200 and the data driver 300 select one pixel line (N, M) in the RT sensing section of the blank period to perform the RT sensing operation, and perform the sensing operation. The pixel line is restored to the previous image data display state in the recovery section.

2 and 3, in the RT sensing section, the data driver 300 converts the sensing data Vdata supplied from the timing controller 400 through the digital-to-analog converter (DAC) and converts each data line ( DL), and a reference voltage Vref for sensing is supplied to each reference line RL through the first switch SW1. The driving TFT DT in the subpixel P selected by the scan gate pulse SCAN and the sense gate pulse SENSE from the gate driver 200 is a sensing data voltage supplied through the first switching TFT ST1. Driven by (Vdata) and the reference voltage for sensing Vref supplied through the second switching TFT ST2, the reference line RL is then floated by the first switch SW1 being turned off. The current reflecting the characteristic (thickness, mobility) of the driving TFT DT is charged to the line capacitor of the reference line RL that is floating through the second switching TFT ST2. The data driver 300 samples the voltage charged in the reference line RL through a sampling unit SAM and converts it into sensing data of each subpixel SP through an analog-to-digital converter ADC, thereby timing controller 400 ). During the RT sensing period, the OLED device 10 is non-emissive.

In the recovery period, the data driver 300 converts the recovery data Vdata supplied from the timing controller 400 into analog data and supplies it to each data line DL, and displays the reference voltage for display through the first switch SW1. Vref) to each reference line RL. The storage capacitor Cst in the subpixel P selected by the gate driver 200 is a recovery data Vdata supplied through the first switching TFT ST1 and an indication supplied through the second switching TFT ST2. For charging the reference voltage Vref, the driving TFT DT is driven according to the voltage charged in the storage capacitor Cst to emit the OLED element 10, so that the sub-pixel subjected to the RT sensing operation returns to the previous display state. Is restored.

On the other hand, the Nth line performing the RT sensing and recovery operation in the blank period of the Nth frame and the Mth line performing the RT sensing and recovery operation in the blank period of the N+1th frame are positioned on the panel 100 The charging (holding) time (t1, t3) for the image data 10 is different from each other, and the difference between the charging (holding) time (t2, t4) for the recovery data (50A, 50B) is different. Therefore, a luminance difference occurs, and a luminance difference may also occur with a non-sensing line that does not perform RT sensing and recovery operations, and thus may be recognized as an RT sensing line.

In order to prevent the visibility of the RT sensing line, the timing controller 400 generates and outputs different recovery data 50A, 50B according to the position of the RT sensing line. Each recovery data 50A, 50B includes image data 10 and different compensation values 30A, 30B according to the position of the RT sensing line. The compensation values 30A and 30B further include compensation values for compensating for a difference in luminance between the RT sensing line and the non-sensing line.

The recovery data 50A, which is located at the upper end of the panel 100 and supplied to the N-th line in which the scan order is relatively fast in the active section, is relatively large because the charging time t2 of the recovery data 50A is relatively short. It includes the compensation value 30A. The recovery data 50B, which is located at the lower end of the panel 100 and is supplied to the M-th line in which the scan order is relatively slow in the active section, is the compensation value because the charging time t4 of the recovery data 50B is relatively long. 30A) and a smaller compensation value 30B.

Accordingly, the Nth line performing the RT sensing and recovery operation in the blank period of the Nth frame, and the Mth line performing the RT sensing and recovery operation in the blank period of the N+1th frame, and the non-sensing line By minimizing the difference in luminance, the visibility of the RT sensing line can be prevented.

On the other hand, as the frame rate for the driving frequency of the OLED display differs, the blanking period of the vertical synchronization signal Vsync varies as shown in FIGS. 4 and 5, so that the charging time of the recovery data varies, which causes RT sensing. The luminance of the line is variable and can be viewed.

To prevent this, the timing controller 400 further recovers data 50A further including compensation values 40A and 40B for compensating for a difference in charging (holding) time of recovery data due to a change in vertical blank time when the frame rate is varied. -1, 50A-2) is generated and output in the recovery section.

For example, when the frame rate is varied, the frequency of the vertical synchronization signal Vsync is variable, so that the blank period in the low-frequency (eg, 24 Hz) vertical synchronization signal Vsync shown in FIG. 5 is a high frequency shown in FIG. 4. It can be seen that it is larger than the blank period in the vertical sync signal Vsync (for example, 120 Hz). On the other hand, since the period of the horizontal synchronization signal Hsync is unchanged, the timing controller 400 detects the frequency variation of the vertical synchronization signal Vsync, that is, the frame rate variation, by counting the blank period using the horizontal synchronization signal Hsync. Can. 4 and 5, the data enable signal DE defines a period during which image data is supplied in each horizontal period (1, 2, ??, 2160) of the horizontal synchronization signal Hsync in the active period.

As shown in FIG. 5, when the vertical sync signal Vsync is low frequency, the count value of the horizontal sync signal Hsync increases, and when the vertical sync signal Vsync is high frequency as shown in FIG. 4, the count value of the horizontal sync signal Hsync decreases. do.

Referring to FIG. 5, when the count value of the horizontal synchronization signal Hsync is large, the charging time of the recovery data after the recovery period in the vertical blank period is relatively long, so the timing controller 400 has a relatively low offset value 40B. The applied recovery data 50A-2 may be generated and output. As a result, the recovery data 50A-2 may include image data 10, a different compensation value 30A depending on the line position, and a different compensation value 40A according to the frame rate.

Referring to FIG. 4, when the count value of the horizontal synchronization signal Hsync is small, since the charging time of the recovery data after the recovery period in the vertical blank period is relatively short, the timing controller 400 has relatively high offset data 40A The generated recovery data 50A-1 may be generated and output. As a result, the recovery data 50A-2 may include image data 10, a different compensation value 30A depending on the line position, and a different compensation value 40B according to the frame rate.

Accordingly, the recovery data 50A-1 and 50A-1 may compensate for a difference in the charging (holding) time of the recovery data due to the change in the vertical blank time when the frame rate is varied, thereby preventing visibility of the RT sensing line.

6 is a flowchart illustrating a method for compensating for recovery data according to an embodiment of the present invention, and is performed by the timing controller 400 shown in FIG. 1.

When the vertical blank period starts, the timing controller 400 reads the count value of the horizontal synchronization signal Hsync (S602) and selects and outputs a recovery compensation value corresponding to the count value read from the lookup table LUT ( S604). The count value of the horizontal sync signal Hsync may be a value obtained by counting the vertical blank period of the immediately preceding frame. Meanwhile, when the vertical blank period starts, the timing controller 400 performs an RT sensing operation on one pixel line in the RT sensing period.

The timing controller 400 generates a recovery data by applying a recovery compensation value to the image data data prior to sensing (S608) when a recovery period occurs after the RT sensing operation (S606; Y). The recovery compensation value may include a compensation value for each position of the sensing line, a compensation value for each frame rate, and a compensation value for compensating for a luminance difference between the sensing line and the non-sensing line. The timing controller 400 restores the sub-pixel to the display state before sensing by supplying the generated recovery data to the corresponding sub-pixel initialized after the sensing operation through the data driver 300.

OLED display device according to an embodiment of the present invention by varying the compensation value applied to the recovery data according to the variation of the vertical blank period according to the frame rate, by varying the charging time of the recovery data in the vertical blank period when the frame rate is varied It is possible to prevent the RT sensing line from being recognized by compensating for the luminance deviation caused.

OLED display device according to an embodiment of the present invention by varying the compensation value of the recovery data according to the position of the RT sensing line due to the difference in charging time difference of the source image data and the charging time difference of the recovery data according to the position of the RT sensing line By further compensating for the luminance deviation, the sensing line can be prevented from being viewed.

The above description is merely illustrative of the present invention, and various modifications may be made without departing from the technical spirit of the present invention by those skilled in the art to which the present invention pertains. Therefore, the embodiments disclosed in the specification of the present invention are not intended to limit the present invention. The scope of the present invention should be interpreted by the following claims, and all technologies within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

100: panel 200: gate driver
300: data driver 400: timing controller
500: memory 600: gamma voltage generation unit
700: power supply

Claims (11)

A panel including a plurality of subpixels;
A panel driver driving the display panel; And
It includes a timing controller for controlling the panel driving unit,
The timing controller
Through the panel driving unit, a sensing operation is performed to sense a characteristic of each subpixel belonging to a selected sensing line by selecting any one sensing line from a sensing period of a vertical blank period of each frame, and a recovery period after the sensing period In the recovery operation to supply the recovery data to each sub-pixel of the sensing line,
The recovery data is an OLED display device that is variable according to the variable frame rate. The method according to claim 1,
The recovery data decreases as the frequency of the frame rate decreases, and increases as the frequency of the frame rate increases. The method according to claim 1,
The recovery data decreases as the vertical blank period increases, and increases as the vertical blank period decreases. The method according to claim 1,
The timing controller counts the vertical blank period using a horizontal synchronization signal, and uses the count value to vary the recovery data. The method according to claim 1,
The timing controller is an OLED display device that compensates the recovery data by selecting a compensation value corresponding to the count value from a look-up table. The method according to claim 1,
The recovery data is an OLED display device that is variable according to the position of the sensing line. A panel including a plurality of subpixels;
A panel driver driving the display panel; And
It includes a timing controller for controlling the panel driving unit,
The timing controller
Through the panel driving unit, a sensing operation is performed to sense a characteristic of each subpixel belonging to a selected sensing line by selecting any one sensing line from a sensing period of a vertical blank period of each frame, and a recovery period after the sensing period In the recovery operation to supply the recovery data to each sub-pixel of the sensing line,
The recovery data is variable according to the position of the sensing line, the OLED display device is variable according to the length of the vertical blank period. The method according to claim 7,
The recovery data decreases as the vertical blank period increases, and increases as the vertical blank period decreases. The method according to claim 7,
The timing controller counts the vertical blank period using a horizontal synchronization signal, and uses the count value to vary the recovery data. The method according to claim 7,
The timing controller is an OLED display device that compensates the recovery data by selecting a compensation value corresponding to the count value from a look-up table. The method according to claim 7,
The recovery data increases as the scan order of the active period is faster in the panel for the sensing line, and decreases as the scan order is slow.

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