KR20180013527A - Organic light emitting diode display and method for driving the same - Google Patents

Abstract

The present invention relates to an organic light emitting display capable of normally performing still image compensation and performing a residual image compensation even when an orbit driving technique is applied, and a driving method thereof. The organic light emitting display according to the present invention includes a plurality (N, m is a natural number equal to or larger than 0) pixels in a horizontal direction and m (m is a natural number equal to or larger than 0) pixels in a vertical direction at a predetermined time interval, and a display panel A set section for outputting shift data including the n and m information, a display section for defining a display area of the display panel as a plurality of display blocks, and a still image among the images displayed on the display blocks The display block including the still image is defined as a compensation block, and input to the compensation block Includes a timing controller to lower the luminance of the image data. At this time, the timing controller judges whether or not a still image is included in each of the display blocks by counting the time for which each display block displays the same image. The timing controller may shift the display block by n and m and output the same time to the same display block in the display block shifted after the shift consecutively before the shift, Counting.

Description

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

The present invention relates to an organic light emitting diode (OLED) display and a driving method thereof, and more particularly, to an OLED display capable of accurately detecting the position of a still image and preventing a residual image of a still image, .

The organic light emitting display device does not require a separate light source but includes an organic light emitting element that emits light in a pixel unit, and the light source and the structure for assembling the light source with the display panel are omitted And it is considered to be a next-generation display device because of its advantage of being thin and lightweight.

Each of the plurality of subpixels constituting the organic light emitting diode display includes an organic light emitting element composed of an organic light emitting layer between an anode and a cathode, and a pixel circuit for independently driving the organic light emitting element.

The pixel circuit includes a plurality of switching transistors, at least one capacitor, and a driving transistor. The plurality of switching transistors charges a data signal in a capacitor in response to a scan signal generated every horizontal period. The driving transistor supplies the constant voltage EV _DD to the organic light emitting element according to the data voltage charged in the capacitor to drive the organic light emitting element.

When the organic light emitting display device is driven for a long time in a state where a specific screen is fixed, a current is caused to flow to the organic light emitting device for a long time, and the organic light emitting device deteriorates due to the stress.

Particularly, when an organic light emitting device is used in a TV, if a specific channel is continuously turned on, a logo of a specific broadcasting company is continuously displayed in the upper right of the screen, so that a residual image of a specific broadcasting company logo may remain even when displaying another screen .

In order to solve the above problem, a residual image compensation technique is used in which a screen is divided into a plurality of blocks, a block in which a still image is displayed, and a luminance of a block in which the still image is displayed is lowered to delay the time of the still image.

In recent years, an orbit driving technique has been proposed in which images displayed on a predetermined time basis are periodically shifted by several pixels to several tens of pixels horizontally and vertically so as to continuously apply severe stress to the same pixel.

However, when the display image is shifted due to the orbit driving, the OLED display adopts the afterimage compensation technique, and recognizes that the motion of the image due to the orbit driving of the blocks is inputted as another image, , It is recognized as a moving image and no residual image compensation is performed. Accordingly, when the organic light emitting display device to which the conventional afterimage compensation technology is applied is applied with an orbit driving technique, there is a problem that afterimage is generated due to no afterimage compensation.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems described above, and it is an object of the present invention to provide an organic light emitting display device and a driving method thereof that can perform still image compensation by normally determining a still image even if an orbit driving technique is applied .

According to an aspect of the present invention, there is provided an OLED display device including a display panel including a plurality of pixels arranged in a matrix, A set section for outputting image data so as to be shifted by m pixels in the vertical direction by m pixels (n, m is a natural number equal to or larger than 0), and outputting shift data including the n, m information; A display block including the still image is defined as a compensation block, and a display block including the still image input to the compensation block is defined as a display block, And a timing controller for lowering the luminance of the data.

At this time, the timing controller judges whether or not a still image is included in each of the display blocks by counting the time for which each display block displays the same image. The timing controller may shift the display block by n and m and output the same time to the same display block in the display block shifted after the shift consecutively before the shift, Counting.

The timing controller defines a display area as a plurality of display blocks and shifts the display block by n and m when shift data is input. A compensation block determination unit for determining a display block having a number of still pixels equal to or greater than a reference value as a compensation block; And a brightness adjusting unit for lowering the brightness of the display unit.

In this case, when the display block is shifted, the block determination unit continuously counts the time during which the same image data is input to pixels located at shifted positions corresponding to the values of n and m from the respective pixels, A pixel located at a position shifted by n, m where the same image data is input for a reference time longer than the counted number of consecutive times can be detected as a still pixel.

The set unit according to another embodiment of the present invention may not generate or output additional shift data. In this case, the timing controller according to another embodiment of the present invention analyzes input image data to detect n and m values, shifts the display block by n and m, and sequentially shifts after the shift, It is possible to count the time at which the same image is output to the display block.

To this end, the timing controller according to another embodiment of the present invention receives image data, analyzes the image data, detects the n and m values, and then generates shift data including the n and m value information And an orbit detecting unit for outputting the image data and the shift data. In this case, the block division unit, the compensation block determination unit, and the luminance adjustment unit are the same as in the previous embodiment.

At this time, the orbit detecting unit analyzes the inputted image data, and determines whether the pixels displaying the black image out of the pixels located outside the display panel are consecutively arranged in the horizontal and vertical directions, By sensing the minimum value in the water, the value of n, m can be calculated.

The set unit according to another embodiment of the present invention may not shift and output the input image data. At this time, the timing controller according to another embodiment of the present invention shifts the display position of the image data so that the input image is shifted by n pixels in the horizontal direction and m pixels in the vertical direction at predetermined time intervals, It is possible to count the time at which the same image is output to the display block shifted in succession after the shift

To this end, the timing controller according to another embodiment of the present invention shifts the display position of input image data by n pixels in the horizontal direction and m pixels in the vertical direction, and shifts the shift data A block dividing unit, a compensation block determination unit, and a luminance adjustment unit.

The block division unit, the compensation block determination unit, and the luminance adjustment unit have the same features as those described in the previous embodiments.

A method of driving an organic light emitting diode display according to the present invention is a method for displaying an image by shifting a display position of input image data by m pixels (m, n, m is a natural number equal to or larger than 0) Defining a display area of the display panel as a plurality of display blocks, counting a time at which the same image data is input to each of the pixels of the plurality of blocks, Detecting a pixel, defining a display block having the number of still pixels equal to or greater than a reference value as a compensation block, and outputting the luminance of the image data input to the compensation block lower.

The display position of the image data input during counting is shifted by n and m pixels while counting the time during which the same image data is input to each of the pixels of the plurality of blocks, Data can be input.

In this case, the counting step may include receiving the shift data and shifting the position of the display block to correspond to the values of n and m, and shifting the position of the display block so as to correspond to the values of n and m from the respective pixels And counting the time during which the same image data is input to the pixels successively in the counting period.

The organic light emitting display according to the present invention can perform the afterimage compensation for the still image even when the screen is shifted by the driving of the orbit, thereby obtaining the effect of compensating the afterimage for the still image and the driving of the obtuse, The life span of the after-image of the light-emitting device provided in the light-emitting device greatly increases.

In particular, in recent years, an organic light emitting display device has been proposed which restricts pixel intervals shifted by orbit driving in order to solve the problem of stopping the afterimage compensation for a still image due to orbit driving. On the other hand, since the organic light emitting display according to the present invention can perform the orbit driving at a wide pixel interval without the pixel interval limitation, the afterglow life of the light emitting device can be maximized as compared with the OLED display .

1 is an exemplary view for explaining an organic light emitting diode display according to the present invention.
2 is an exemplary diagram illustrating the structure of each pixel of the display panel.
FIG. 3 is an exemplary view for explaining a set unit and a timing controller according to the first embodiment of the present invention, and FIG. 4 is an exemplary view for explaining a display block of the display panel according to the present invention.
5 is an exemplary diagram illustrating a set unit and a timing controller according to a second embodiment of the present invention.
FIG. 6 is a diagram illustrating an example in which the orbit detecting unit senses the distance in which the display image is shifted in the horizontal and vertical directions.
7 is an exemplary diagram illustrating a set unit and a timing controller according to a third embodiment of the present invention.
8 is a flowchart illustrating a driving method of an OLED display according to an exemplary embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Like reference numerals throughout the specification denote substantially identical components. In the following description, when it is determined that a detailed description of a technique or configuration related to the present invention may unnecessarily obscure the gist of the present invention, a detailed description thereof will be omitted. The component names used in the following description are selected in consideration of easiness of specification, and may be different from the parts names of actual products.

The shapes, sizes, ratios, angles, numbers and the like disclosed in the drawings for describing the embodiments of the present invention are merely exemplary and are not limited to those disclosed in the present invention.

1 is an exemplary view for explaining an organic light emitting diode display according to the present invention.

The organic light emitting display according to the embodiment of the present invention includes a display panel 100, a data driver 200 and a gate driver 300, a timing controller 400, and a set unit 500.

The display panel 100 includes a plurality of pixels including a plurality of gate lines GL and data lines DL and a plurality of pixels P arranged in a matrix in a region where the gate lines GL and the data lines DL cross each other. And a plurality of driving power supply lines PL and a plurality of reference lines RL which are positioned in parallel with the data lines DL.

2 is an exemplary diagram for explaining the structure of each pixel of the display panel 100. As shown in FIG.

Each pixel of the display panel 100 is provided with an organic light emitting element OLED composed of an organic light emitting layer between the anode and the cathode and a pixel driving unit independently driving the organic light emitting element OLED.

The pixel driver includes at least one switching transistor TR1 and TR3, at least one capacitor Cst, and a driving transistor TR2. The plurality of switching transistors TR1 and TR3 charge a data voltage to a capacitor Cst through a data line DL in response to a scan signal generated in units of horizontal periods. The driving transistor TR2 supplies the voltage V _DD to the organic light emitting element in accordance with the data voltage charged in the capacitor Cst to drive the organic light emitting element OLED. The pixel structure shown in FIG. 2 has a 3T1C structure, but the structure of the pixel P according to the present invention is not limited thereto.

The set unit 500 supplies the timing synchronization signal and the image data (Vdata) to the timing controller 400.

The timing controller 400 generates a gate control signal GCS and a data control signal DCS using the timing synchronization signal input from the set unit 600. [ Here, the timing synchronization signal may include a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal DE, and a clock signal DCLK.

The timing controller 400 controls operations of the data driver 200 and the gate driver 300 using a gate control signal GCS and a data control signal DCS.

The gate driver 300 supplies the scan signal to drive the gate line.

The data driver 200 receives the data control signal and the image data, converts the image data into analog data at the display timing of the image, and outputs the data to the data lines DL of the display panel 100.

In addition to the features described above, the OLED display according to the present invention may be configured such that an image displayed on a plurality of pixels is shifted by n in the horizontal direction and m (n, m is an integer of 0 or more) pixels in the vertical direction at regular intervals The display screen is divided into a plurality of display blocks to detect a display block for displaying a still image and a brightness of a display block for displaying a still image is lowered, And carries out a residual image compensation drive for delaying the time of a residual image.

Hereinafter, various embodiments of the setting unit 500 and the timing controller 400 for the orbit driving and residual image compensation driving of the present invention will be described.

FIG. 3 is an exemplary view for explaining the setting unit 500 and the timing controller 400 according to the first embodiment of the present invention, and FIG. 4 is a diagram illustrating a display block BL of the display panel 100 according to the present invention. Fig.

The set unit 500 according to the first embodiment of the present invention is configured such that an image displayed on each pixel P of the display panel 100 is displayed in a horizontal direction at an interval of time and m (0 or more) pixels) to the timing controller 400 and outputs the shifted display position to the timing controller 400. In addition, the set unit 500 outputs, to the timing controller 400, shift data including information on the values of n and m.

The timing controller 400 defines the display area of the display panel 100 as a plurality of display blocks BL as shown in FIG. 4, and a still image among the images displayed on the display blocks BL is included And a display block BL including a still image is defined as a compensation block. Then, the timing controller 400 lowers the luminance of the image data input to the compensation block and outputs the luminance to the data driver 200. [

At this time, the timing controller 400 counts the time for displaying the same image in each display block BL whether or not the still image is included in each display block BL, and if the counted time exceeds the reference time Whether it is through the judge. Here, the 'reference time' has a predetermined predetermined value, and may be, for example, between about 5 minutes and 1 hour, but is not limited thereto.

The shift data may be input while the timing controller 400 counts the time during which the display block BL displays the same image. Then, the timing controller 400 shifts the display block BL to correspond to the above-mentioned n, m pixels, and displays the same image on the display block BL shifted after the shift continuously following the counting time until the shift Counts the number of times that

To this end, the timing controller 400 includes a block dividing unit 410, a compensation block determining unit 420, and a luminance adjusting unit 430.

The block dividing unit 410 divides the display panel into a plurality of display blocks BL. The block dividing unit 410 receives the image data and the shift data, and also shifts the position of the display block BL by the shifted position of the display image. In other words, the block dividing unit 410 receives the shift data and shifts the display block BL by n, m values included in the shift data.

For example, assuming that the display position of the image data input to the timing controller 400 is shifted by 10 pixels on the right side and 15 pixels on the lower side, the shift data has an n value of 10 and a m value of 15. In accordance with such shift data, the block dividing unit 410 also shifts the display block BL by 10 pixels to the right and 15 pixels to the lower side.

The block dividing unit 410 does not shift the display block BL if the n and m values of the shift data are 0 or the shift data is not inputted.

The block division unit 410 outputs the position information of the display block BL including the position of the display block BL and the input image data to the compensation block determination unit 420.

The compensation block determination unit 420 counts the time during which the same image data is input to each pixel of the display block BL. Then, the compensation block determination unit 420 detects a still pixel to which the same image data is input for a counting result reference time or more, and defines a display block (BL) whose number of the still pixels is equal to or greater than a reference value as a compensation block.

Here, the reference value is a predetermined value. For example, the reference value may be the number of pixels corresponding to 10% of the pixels included in each display block BL, but the present invention is not limited thereto.

The shift data may be inputted while counting the time during which the same image data is inputted to each pixel of the display block BL so that the position of the display block BL may be shifted. The compensation block determination unit 420 receives the position information of the shifted display block BL from the block division unit 410 and updates the position of the display block BL. Then, the compensation block determination unit 420 counts the time for which the same image data is input to the pixels located at the positions shifted by n, m from the respective pixels of the pre-shift display block BL, Counts consecutively at the previous counting time, and when the consecutive counted time is equal to or longer than the reference time, pixels positioned at positions shifted by n, m are detected as still pixels. Then, the compensation block determination unit 420 defines the display block BL whose number of stop pixels located in the updated display blocks BL is equal to or greater than the reference value as a compensation block.

Generally, in a logo area indicated as LOGO in FIG. 4, many stop pixels are detected and defined as a compensation block. A display area where many still pixels are detected in other display blocks can be applied as a compensation block.

The brightness controller 430 receives the compensation block information from the compensation block determiner 420 and lowers the brightness of the image data input to each pixel located in the compensation block and outputs the brightness to the data driver 200. At this time, the luminance controller 430 may lower the brightness of the image data by lowering the gain value of the image data input to each pixel located in the compensation block.

5 is an exemplary diagram illustrating the set unit 501 and the timing controller 401 according to the second embodiment of the present invention.

The set unit 501 according to the second embodiment of the present invention is configured such that an image displayed on each pixel P of the display panel 100 is displayed in a horizontal direction at an interval of time and m (0 or more) pixels) and outputs the shifted display position to the timing controller 401. At this time, the set unit 501 does not output additional shift data information.

The timing controller 401 defines the display area of the display panel 100 as a plurality of display blocks BL and determines whether a still image among the images displayed on the display blocks BL is included And a display block BL including a still image is defined as a compensation block. Then, the timing controller 401 lowers the luminance of the image data input to the compensation block and outputs the luminance to the data driver 200. [

At this time, the timing controller 401 counts whether or not a still image is included in each display block BL, counts the time for each display block BL to display the same image, and determines whether the counted time exceeds the reference time Whether it is through the judge. Here, the 'reference time' has a predetermined predetermined value, and may be, for example, between about 5 minutes and 1 hour, but is not limited thereto.

Also, when the shifted image data is input from the set unit 501 during counting, the timing controller 401 analyzes the shifted image data and detects the values of n and m. The timing controller 401 shifts the display block BL to correspond to n and m and counts the time at which the same image is displayed on the display block BL shifted after the shift consecutively until the shift is counted .

The timing controller 401 includes an orbit detecting unit 440, a block dividing unit 411, a compensation block determining unit 421, and a brightness adjusting unit 431. [

The orbit detecting unit 440 receives the shifted image data, analyzes the image data, detects the n and m values, generates shift data including information on n and m values, and outputs the shifted image data And outputs it to the block division unit 411. On the other hand, if the image data is not shifted, the orbit detecting unit 440 outputs the input image data to the block dividing unit 411 without outputting the shift data.

In this case, the orbit detecting unit 440 analyzes the inputted image data to determine whether the pixels displaying the black image among the pixels located at the outer periphery of the display panel 100 have the minimum value and the vertical direction The n and m values can be calculated. For example, it is assumed that an image displayed as shown in FIG. 6 is shifted by 14 pixels in the horizontal direction and 16 pixels in the vertical direction. The region described as "Black Data" is a region in which the displayed image is shifted to display black data, but no separate black is displayed for easy viewing. Also, the area shown in black indicates an area where black data is displayed among the input images.

6, the minimum value (H_min) in which the pixels for displaying the black image in the horizontal direction are consecutively arranged among the pixels located at the outskirts of the display panel is 14, and the pixels displaying the black image in the vertical direction are consecutive The minimum value (V_min) arranged to be " 0 " The arrangement of the pixels displaying more black images in succession means that a black image is displayed in the display area. In this case, the n value is determined to be 14 and the m value is determined to be 16.

In this manner, the orbit detecting unit 440 calculates the n and m values, generates shift data including the n and m value information, and outputs the generated shift data to the block dividing unit 411.

The detailed configurations of the block division unit 411, the compensation block determination unit 421, and the luminance adjustment unit 431 are the same as those described in the first embodiment, and thus detailed description of these configurations is omitted.

As described above, the organic light emitting diode display according to the second embodiment of the present invention extracts shift information due to orbit from the timing controller 401 even if the set unit 501 does not give any information about the driving of the orbit, It is possible to discriminate the still image according to the information and perform the residual image compensation.

7 is an exemplary diagram for explaining the setting unit 502 and the timing controller 402 according to the third embodiment of the present invention.

The set unit 502 according to the third embodiment of the present invention outputs the video data to the timing controller 402. [ At this time, the set unit 502 does not perform another orbit driving, and performs the orbit driving in the timing controller 402.

The timing controller 402 according to the third embodiment of the present invention defines a display area of the display panel 100 as a plurality of display blocks BL and a still image out of the images displayed on the display blocks BL And the display block BL including the still image is defined as a compensation block. The timing controller 402 lowers the luminance of the image data input to the compensation block and outputs the luminance to the data driver 200.

At this time, the timing controller 402 counts the time for displaying the same image in each display block BL whether or not a still image is included in each display block BL, and if the counted time exceeds the reference time Whether it is through the judge. Here, the 'reference time' has a predetermined predetermined value, and may be, for example, between about 5 minutes and 1 hour, but is not limited thereto.

Meanwhile, the timing controller 402 controls the timing controller 402 to shift the display position of the image data so that the image displayed on each pixel of the display panel 100 is shifted by n pixels in the horizontal direction and m pixels in the vertical direction at regular time intervals Drive. When the display position of the image data is shifted by performing the orbit driving during the counting for detecting whether or not the still image is included, the timing controller 400 shifts the display block BL by m, n, The display block BL including the same image is defined as a compensation block by counting the time during which the same image is outputted to the shifted display block BL after the shift consecutively the time counted before the shifting of the display block BL.

The timing controller 402 includes an orbit applying unit 450, a block dividing unit 412, a compensation block determination unit 422, and a luminance adjustment unit 432. [

The orbit applying unit 450 converts the display position of the input image data so that the display position of the input image data is shifted by n pixels in the horizontal direction and m pixels in the vertical direction at predetermined time intervals, And generates and outputs shift data including the value information.

The block dividing unit 412 and the compensation block determination unit 422 and the luminance adjustment unit 432 are the same as the block division unit 410, the compensation block determination unit 420, and the luminance adjustment unit 432 according to the first embodiment. 430), detailed description thereof will be omitted.

The set unit 500 according to the third exemplary embodiment of the present invention does not perform orbit driving and extracts shift information in which an image is shifted by performing an orbit driving operation in a timing controller 400, So that the residual image can be compensated for the still image.

Hereinafter, a driving method of an OLED display according to the present invention will be described with reference to the drawings.

8 is a flowchart illustrating a driving method of an OLED display according to an exemplary embodiment of the present invention.

In the organic light emitting diode display according to the present invention, input image data is shifted in display position by n in the horizontal direction and m (n, m is an integer of 0 or more) pixels in the vertical direction at predetermined time intervals.

The display area of the display panel 100 is defined as a plurality of display blocks BL. (S1)

Next, the time when the same image data is input to each of the pixels of the plurality of blocks is counted. (S2)

Then, a still pixel to which the same video data equal to or longer than the reference time is input is detected. (S3)

During the counting, the display position of the image data is shifted by n in the horizontal direction and m in the vertical direction, and the shift data including the n, m information can be input. (S2-1)

When the shift data is inputted, the position of the display block BL is shifted so that the position of the display block BL corresponds to the value of n, m (S2-2)

When the position of the display block BL is shifted, the time at which the same image data is input to pixels located at shifted positions corresponding to the values of n and m from the respective pixels is counted before the display block and the pixels are shifted Counts consecutively at the preceding counting time. (S2-3)

A still pixel to which the same video data equal to or longer than the reference time is inputted is detected. (S3)

At this time, the time when the input of the same image data is counted to each pixel before the position of the display block BL is shifted and the time when the position of the display block BL is shifted to correspond to the value of n, m (S3) the pixels positioned at the shifted position are detected as the stopping pixels when the time counted is equal to the reference time,

A display block (BL) having the number of still pixels equal to or greater than a reference value is defined as a compensation block (S4)

The brightness of the image data input to the compensation block is lowered and output. At this time, the brightness of the image data input to the compensation block can be reduced and output by lowering the gain value of the image data input to the compensation block. (S5)

Converts the image data into analog data, and outputs the data to the display panel 100. (S6)

As described above, the organic light emitting diode display according to the present invention can compensate the still image for the still image even when the screen is shifted by the driving of the orbit, , So that the after-image lifetime of the light emitting element provided in each pixel is greatly increased.

In particular, in recent years, an organic light emitting display device has been proposed which restricts pixel intervals shifted by orbit driving in order to solve the problem of stopping the afterimage compensation for a still image due to orbit driving. On the other hand, since the organic light emitting display according to the present invention can perform the orbit driving at a wide pixel interval without the pixel interval limitation, the afterglow life of the light emitting device can be maximized as compared with the OLED display .

The foregoing description is merely illustrative of the present invention, and various modifications may be made by those skilled in the art without departing from the spirit of the present invention. Accordingly, 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 construed according to the following claims, and all the techniques within the scope of equivalents should be construed as being included in the scope of the present invention.

100: display panel 200: data driver
300: Gate driver 400, 401, 402: Timing controller
410, 411, 412: block dividing unit 420, 421, 422:
430, 431, and 432: a brightness adjusting unit 500, 501, 502:
440: Orbit detection unit 450: Orbit application unit

Claims (8)

A display panel including a plurality of pixels arranged in a matrix form,
(N, m is an integer equal to or greater than zero) pixels in a horizontal direction and m (m is an integer of 0 or more) pixels in a vertical direction, and outputs the image data to the n, m A set section for outputting shift data including information,
A display block of the display panel is defined as a plurality of display blocks and a display block including the still image is defined as a compensation block by determining whether a still image among the images displayed on the display blocks is included, And a timing controller for lowering the brightness of the video data input to the block and outputting the brightness,
Wherein the timing controller determines whether or not a still image is included in each of the display blocks by counting a time for which each display block displays the same image, and when the shift data is input during counting, m, and counts the time at which the same image is outputted to the display block shifted after the shift, which is consecutive to the counted time before the shift. The method according to claim 1,
The timing controller includes:
A block dividing unit that defines a display area of the display panel as a plurality of display blocks and shifts the display block to correspond to the n and m values when the shift data is input,
Wherein a number of pixels of the display block defined by the block division unit is counted for inputting the same image data to detect a still pixel to which the same image data equal to or longer than a reference time is inputted, Blocks, and when the display block is shifted during the counting, the time during which the same image data is input to pixels located at shifted positions corresponding to the values of n and m from the respective pixels is successively counted A compensation block determination unit for detecting, as a still pixel, pixels located at positions shifted by n, m from which image data equal to or longer than the reference time is input in the continuously counted time,
And a brightness controller for lowering the brightness of image data input to each pixel of the compensation block and outputting the brightness of the image data. A display panel including a plurality of pixels arranged in a matrix form,
A set unit for outputting image data such that an image displayed on the plurality of pixels is shifted by n in a horizontal direction and m (n, m is an integer of 0 or more) pixels in a vertical direction at regular time intervals;
A display block of the display panel is defined as a plurality of display blocks and a display block including the still image is defined as a compensation block by determining whether a still image among the images displayed on the display blocks is included, And a timing controller for lowering the brightness of the video data input to the block and outputting the brightness,
The timing controller includes:
Determining whether or not a still image is included in each of the display blocks by counting a time for each display block to display the same image; if the image is shifted during the counting, And counts the time at which the same image is outputted to the display block shifted after the shift continuously following the counted time before shifting, by shifting the display block by n, m. The method of claim 3,
The timing controller includes:
An observer for receiving the image data, analyzing the image data to detect the n and m values, generating shift data including the n and m value information, and outputting the image data and the shift data,
A block dividing unit that defines a display area of the display panel as a plurality of display blocks and shifts the display block to correspond to the n and m values when the shift data is input,
Wherein a number of pixels of the display block defined by the block division unit is counted for inputting the same image data to detect a still pixel to which the same image data equal to or longer than a reference time is inputted, Blocks, and when the display block is shifted during the counting, the time during which the same image data is input to pixels located at shifted positions corresponding to the values of n, m from the respective pixels is successively counted A compensation block determination unit for detecting, as a still pixel, pixels located at positions shifted by n, m from which image data equal to or longer than the reference time is input in the continuously counted time,
And a brightness controller for lowering the brightness of image data input to each pixel of the compensation block and outputting the brightness of the image data. 5. The method of claim 4,
The orbit detecting unit analyzes the inputted image data and determines whether the pixels displaying the black image out of the pixels located in the outskirts of the display panel are sequentially arranged in the horizontal direction, And calculating the n and m values by sensing a minimum value among the n and m values. A display panel including a plurality of pixels arranged in a matrix form,
A display block of the display panel is defined as a plurality of display blocks and a display block including the still image is defined as a compensation block by determining whether a still image among the images displayed on the display blocks is included, And a timing controller for lowering the brightness of the video data input to the block and outputting the brightness,
The timing controller includes:
And determining whether or not a still image is included in each of the display blocks by counting a time at which each display block displays the same image. The image displayed on the pixels is divided into n in a horizontal direction and m n, m is an integer equal to or greater than 0) pixels, and when the display position of the image data is shifted during the counting, the display block is shifted by n, m, And counts the time during which the same image is output to the display block shifted after the shift in succession to the counted time before the shift of the organic light emitting display. The method according to claim 6,
The timing controller includes:
The display position of the image data is shifted so that the display position of the input image data is shifted by n pixels in the horizontal direction and m pixels in the vertical direction and the shifted data including the n and m value information is generated, An orbit application unit for outputting,
A block dividing unit that defines a display area of the display panel as a plurality of display blocks and shifts the display block to correspond to the n and m values when the shift data is input,
Wherein a number of pixels of the display block defined by the block division unit is counted for inputting the same image data to detect a still pixel to which the same image data equal to or longer than a reference time is inputted, Blocks, and when the display block is shifted during the counting, the time during which the same image data is input to pixels located at shifted positions corresponding to the values of n, m from the respective pixels is successively counted A compensation block determination unit for detecting, as a still pixel, pixels located at positions shifted by n, m from which image data equal to or longer than the reference time is input in the continuously counted time,
And a brightness controller for lowering the brightness of image data input to each pixel of the compensation block and outputting the brightness of the image data. A method of driving an organic light emitting display in which an image is displayed by shifting a display position of input image data by m pixels (n, m is a natural number equal to or larger than 0) pixels in a horizontal direction and m vertical direction at regular time intervals,
Defining a display area of the display panel as a plurality of display blocks,
Counting a time at which the same image data is input to each pixel of the plurality of blocks,
Detecting a still pixel to which the same video data equal to or longer than the reference time is inputted,
Defining a display block having the number of still pixels equal to or greater than a reference value as a compensation block, and
And outputting the luminance of the image data input to the compensation block by lowering the luminance of the image data input to the compensation block,
Wherein the counting of the time during which the same image data is input to each of the pixels of the plurality of blocks includes:
Receiving the shift data including the n and m information while shifting the display position of the input image data by n and m pixels during the counting,
Receiving the shift data and shifting the position of the display block to correspond to the values of n and m,
And counting the time during which the same image data is input to the pixels located at shifted positions corresponding to the values of n and m from the respective pixels, successively in the counting period.

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