KR20170003251A - Organic light emitting diode display device and method for driving the same - Google Patents

Abstract

The present invention provides an organic light emitting diode (OLED) display device and a method for driving the same. The OLED display device according to the present invention comprises: an image display panel having a plurality of pixel regions; a gate driver unit driving gate lines of the image display panel; a data driver unit driving data liens of the image display panel; a power supply unit applying first and second power signals to power lines of the image display panel; and a timing controller unit detecting current at each location of an OLED panel according to an image input, accumulating the detected current by reflecting an acceleration factor and a temperature acceleration factor by the current, predicting a degree of degradation of a device and applying a compensation value to the device according to the predicted degree of degradation.

Description

Technical Field [0001] The present invention relates to an organic light emitting diode (OLED) display device and a method of driving the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic light emitting diode (OLED) display device and a driving method thereof, which compensates for darkness by accumulating input current for each pixel of an organic light emitting diode display device and estimating the degree of deterioration 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. 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.

Since the temperature sensing compensation method according to the related art is required to further include a temperature sensing circuit and a compensation circuit for sensing the temperature, the cost is inevitably increased and the detection temperature is not accurate depending on the characteristics of the display image or 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.

On the other hand, unlike a liquid crystal device in which a transmittance varies according to an input voltage, an OLED is a light emitting device that directly generates light according to an input current. However, it has a problem that the efficiency of light generated according to the current is deteriorated gradually as time elapses like other light emitting devices. However, such a problem is caused when the input image A residual image appears.

Particularly, there is a variation in the degree of deterioration for each panel when accumulating the same data, and a variation in the degree of deterioration for each position in the panel. The deterioration of the OLED is a major factor in the current input to each OLED element.

Also, the input current varies depending on the device efficiency characteristic for the same image for each OLED panel.

Furthermore, since the input current is also different for the same input gray level in the OLED panel, the degree of deterioration of the input image and the OLED is not linear and the cumulative accuracy is lowered.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an organic light emitting diode display device and a driving method thereof that compensate for darkness by accumulating input current for each pixel of an OLED panel to predict the degree of deterioration and using the predicted degree of deterioration.

According to an aspect of the present invention, there is provided an image display apparatus including a video display panel that detects a current corresponding to an input video according to an input image, reflects an acceleration factor and a temperature acceleration factor for each current, accumulates the current, And a timing controller for applying a compensation value to the device according to a predicted degree of deterioration of the organic light emitting diode display device.

In the organic light emitting diode display device according to the present invention, the timing control unit may include a deterioration prediction unit that receives input image data from the outside through an input image unit and predicts the degree of deterioration for each pixel, A deterioration compensating unit for compensating deterioration according to the degree of deterioration, and an output image unit for applying a compensated value from the deterioration compensating unit and outputting the compensated value.

In the organic light emitting diode display according to the present invention, the deterioration prediction unit may include a current conversion unit that receives input image data from an external source through an input image unit and converts each gray value into a current, A stress transducer for converting an acceleration factor into a stress and a temperature analyzer for calculating a temperature distribution of the image by reflecting a temperature acceleration factor through a temperature analysis of the current converted through the current transducer, And a cumulative calculation unit for accumulating the stress applied to the OLED element by reflecting the current distribution through the stress conversion unit and the temperature distribution through the temperature analysis unit.

In the organic light emitting diode display according to the present invention, the current converter may include a position determination unit for determining a position of each pixel using a signal of the data enable unit, A reference current LUT for defining a reference current of each panel by a voltage through the LUT, the gradation unit and the gamma unit, a current value from the reference current LUT of the panel and a current value from the current LUT for each position, And a current generator for generating a compensation current value through the current calculator.

In the organic light emitting diode display according to the present invention, the temperature analyzing unit includes sub-pixel analysis for analyzing the temperature of each sub-pixel through a current input to each pixel, and sub- A temporal analysis for analyzing the temperature difference over time, and a spatial analysis for the characteristics of the panel and the pixel according to the change in temperature influence.

According to another aspect of the present invention, there is provided an image display apparatus including a first step of detecting a current according to an input image for each position of an image display panel, And a third step of applying a compensation value to the device in accordance with the degree of deterioration predicted by predicting the degree of deterioration of the device, according to an embodiment of the present invention.

In the driving method of the organic light emitting diode display according to the present invention, the first and second steps may include receiving input image data from the outside through the input image unit and converting each gray value into a current, A step of converting the converted current into a stress reflecting a current acceleration factor, calculating a temperature distribution of the image by reflecting a temperature acceleration factor through temperature analysis of the converted current, And accumulating the stress applied to the OLED element by reflecting the current distribution and the temperature analysis.

In the method of driving an organic light emitting diode display according to the present invention, the step of converting the gray value into a current includes the steps of: determining a position of each pixel using a signal of a data enable unit; The method comprising the steps of: detecting a pixel-by-pixel current in the panel with a current-based LUT; defining a reference current LUT defining a reference current of each panel by voltage across the gradation and gamma units; And calculating a compensation value by calculating a current value and a current value from the position-dependent current LUT.

In the method of driving the organic light emitting diode display device according to the present invention, the step of calculating the temperature distribution of the image by reflecting the temperature acceleration factor through the temperature analysis of the converted current may include: Calculating a temperature for each pixel by analyzing the temperatures detected by the sub-pixel analysis, analyzing a temperature difference with time, and analyzing the temperature dependency of the panel and pixel characteristics, And then analyzing it.

 The organic light emitting diode display and the driving method thereof according to the present invention detect the current according to the input image for each position of the OLED panel and then reflect the acceleration factor and the temperature acceleration factor for each current, The residual image of the OLED can be removed by applying a compensation value to the OLED device according to the predicted degree of deterioration.

1 is a configuration diagram of an OLED display device according to the present invention.
2 is a block diagram specifically showing the timing control unit shown in FIG.
3 is a block diagram specifically illustrating an OLED deterioration prediction / compensation system using current accumulation according to the present invention.
4 is a block diagram schematically illustrating a current transformer of an OLED deterioration prediction / compensation system using current accumulation according to the present invention.
5 is a configuration diagram specifically illustrating a current conversion unit of the OLED deterioration prediction / compensation system using current accumulation according to the present invention.
6 is a graph schematically showing the current and luminance distribution in an OLED panel according to the present invention.
FIG. 7 is a graph showing the relationship between the efficiency and the stress due to reflection of the current acceleration factor of the OLED deterioration prediction and compensation system using current accumulation according to the present invention.
8 is a block diagram schematically illustrating a temperature analysis unit of the OLED deterioration prediction / compensation system according to the present invention.
FIG. 9A is a schematic view showing an image temperature distribution according to positions of an OLED panel according to the present invention, and FIG. 9B is a photograph schematically showing a reproduced image of an OLED panel according to the present invention.
10 is a schematic diagram illustrating a temporal analysis of the temperature analysis unit of the OLED deterioration compensation system according to the present invention.
FIG. 11A is a graph showing a change in temperature influence in a temperature distribution on an OLED panel according to the present invention, and FIG. 11B is a graph showing a change in temperature influence in a temperature distribution of each pixel of an OLED panel according to the present invention.

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 the present invention.

1, an organic light emitting diode display device according to the present invention includes an image display panel 110 having a plurality of pixel regions, a plurality of gate lines GL1 to GLn of the image display panel 110, A gate driver 120, a data driver 130 for driving the data lines DL1 to DLm of the image display panel 110, a data driver for driving the data lines DL1 to DLm of the image display panel 110, A power supply unit 140 for applying first and second power supply signals VDD and GND to the power supply lines PLn to PLm of the image display panel 110, And the OLED element is predicted to be degraded by accumulating the current acceleration factor and the temperature acceleration factor by accumulating the current and the compensation factor for the OLED element according to the predicted deterioration degree. The input image data To maintain or update of the gray level value having a timing controller 150 for performing the deterioration compensation.

In the image display panel 110, 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.

One subpixel P is a diode driving circuit connected to a gate line GL and a data line DL and a power supply line PL and a second driving circuit GND connected between the diode driving circuit and the second power supply signal GND. And a 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 120 responds to a gate control signal GVS 164 from the timing controller 150 in response to a Gate Start Pulse (GSP) and a Gate Shift Clock (GSC) Sequentially generates a gate-on signal, 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 130 receives the data control signal DVS 166 from the timing controller 150 using a source start pulse SSP and a source shift clock SSC, (MDATA) 162 modulated on a frame-by-frame basis from the input unit 150 into an analog voltage, that is, an analog video signal.

In response to a source output enable (SOE) signal, a video signal is supplied to each data line DL1 to DLm. The data driver 130 latches the compensation data (MDATA) 162 inputted in accordance with the SSC and then outputs one horizontal line per one horizontal period in which the scan pulses are supplied to the gate lines GL1 to GLn in response to the SOE signal. To each of the data lines DL1 to DLm.

The power supply unit 140 supplies the first power supply signal VDD and the second power supply signal GND to the image display panel 110. The first power supply signal VDD denotes a driving voltage for driving the light emitting cell OEL and the second power supply signal VDD is different from the second power supply signal GND, A current corresponding to the video signal may flow.

The timing controller 150 detects the current for each pixel of the input image data from the outside through the input image portion (RGB) 200, reflects the acceleration factor and the temperature acceleration factor for each current, accumulates the current, . The compensation data (MDATA) 162 is generated by maintaining or updating the tone value of the input image data by applying a preset compensation value to the OLED element according to the predicted deterioration degree.

In addition, the timing controller 150 aligns the compensation data (MDATA) 162 so as to be suitable for driving the image display panel 110, and supplies the data to the data driver 130. The gate control unit 150 generates gate and data control signals GVS and VDS using the synchronization signals Dclk, DE, Hsync and Vsync input from the outside of the timing controller 150, (130) to control the gate and data drivers (120, 130).

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

The timing controller 150 shown in FIG. 2 detects the current for each pixel of the input image data from the outside through the input image portion (RGB) 200, reflects the acceleration factor and the temperature acceleration factor for each current, (MDATA) 162 by maintaining or updating the gradation value of the input image data by applying a preset compensation value to the OLED element according to the predicted degree of deterioration after predicting the degree of deterioration of the OLED element, A data control signal (GVS) 164 for controlling the driving timing of the data driver 130 using at least one of the synchronization signals Dclk, DE, Hsync, and Vsync from the outside, A gate control signal generator 154 for generating and outputting a data signal for controlling the driving timing of the data driver 130 using at least one of the synchronization signals Dclk, DE, Hsync, and Vsync, And a signal (DVS) (166) generates and outputs the data control signal generator 156 for the.

The data compensation processing unit 152 divides the input image data for each pixel through the input image unit 200 from the outside.

Then, the current of the image data for each pixel is sequentially detected, and the current-dependent acceleration factor and temperature acceleration factor are reflected.

Accumulates and predicts the degree of deterioration of the OLED element, and then applies a preset compensation value to the OLED element according to the predicted degree of deterioration to maintain or update the gradation value of the input image data to generate compensation data (MDATA) .

The thus generated compensation data (MDATA) 162 is supplied to the data driver 130 in units of at least one horizontal line.

The gate control signal generating unit 154 generates at least one of the input synchronizing signals Dclk, DE, Hsync and Vsync by using a data enable signal DE and a horizontal synchronizing signal Hsync, for example. And generates and outputs gate control signals (GVS) 164 for controlling the driving timing of the gate driver 120. [

The data control generating unit 156 generates at least one of the input synchronizing signals Dclk, DE, Hsync and Vsync using the data enable signal DE and the vertical synchronizing signal Vsync, (DVS) 166 for controlling the driving timing of the data driver 130.

3 is a block diagram specifically illustrating an OLED deterioration prediction / compensation system using current accumulation according to the present invention.

As shown in FIG. 3, the OLED deterioration prediction and compensation system using current accumulation according to the present invention includes a deterioration prediction unit for receiving input image data from the outside through the input image unit 200 and for predicting the degree of deterioration for each pixel, A deterioration compensator 400 for compensating deterioration in accordance with the degree of deterioration predicted by the deterioration predictor 300, an output image compensator 400 for applying a compensated value from the deterioration compensator 400, (500).

The deterioration prediction unit 300 includes a current transform unit 310 that receives input image data from the outside through the input image unit 200 and converts each gray value into a current, a stress conversion unit 320 for converting the temperature of the current transformed through the current transform unit 310 into a stress to reflect the temperature of the current transformed by the current transform unit 310, And a temperature accumulation unit 330 for accumulating the stress applied to the OLED by reflecting the temperature distribution through the temperature distribution unit 330 and the current distribution through the stress conversion unit 320. [ (360).

In this way, when the same current is input to the OLED panel and the degree of deterioration is detected for each position, the device efficiency variation according to the position is very small except for the center portion of the screen where the temperature is high. That is, when the temperature is the same, deterioration prediction with little deviation can be performed using the current.

Therefore, if the current is accumulated rather than the input image and the temperature is reflected, the degree of deterioration can be predicted.

4 is a block diagram schematically illustrating a current transformer of an OLED deterioration prediction / compensation system using current accumulation according to the present invention.

5 is a configuration diagram specifically illustrating a current conversion unit of the OLED deterioration prediction / compensation system using current accumulation according to the present invention.

4, the current transform unit 310 of the OLED deterioration prediction / compensation system using current accumulation according to the present invention receives input image data from the outside through the input image unit 200 and outputs each gray value Current conversion 316 through the gamma unit 220 and the current LUT 314 for conversion to current.

5, a position determiner 312 for determining the position of each pixel using at least one of the synchronization signals Dclk, DE, Hsync, and Vsync, for example, a signal of the data enable unit 230, A reference current LUT 311 for defining a reference current of each panel by a voltage through the gradation unit 210 and the gamma unit 220, A current calculator 314 for calculating a compensation value by calculating a current value from the reference current LUT 311 of the panel and a current value from the current LUT 313 for each position, And a current generation unit 315 that generates a compensation current value through the current detection unit 314.

As described above, the input current varies at the same gray level for each position in the same panel. For example, at the output of gray (255 gray), values for current and luminance for each position are obtained and the relationship is grasped.

6 is a graph schematically showing the current and luminance distribution in an OLED panel according to the present invention.

As shown in FIG. 6, since the current and luminance distribution in the OLED panel are not uniform, the luminance deviation of the panel and the position is reflected through the luminance photographing at the initial stage of the panel.

FIG. 7 is a graph showing the relationship between the efficiency and the stress due to reflection of the current acceleration factor of the OLED deterioration prediction and compensation system using current accumulation according to the present invention.

As shown in Fig. 7, even when the accumulated current (i.e., current x time) is the same, the device efficiency may differ. However, if the cumulative value of the same current is present, the current is converted so that the same device efficiency is obtained. At this time, by reflecting the current acceleration factor with time, it is converted into a certain pattern of stress (that is, current × current acceleration factor).

This allows the relationship between stress and device efficiency to have a very high relationship with the exponential decay function representing the natural deterioration model.

On the other hand, in order to grasp the degree of deterioration prediction, the current according to the input image must be detected for each position of the OLED panel described above, and the current acceleration factor should be reflected and the temperature acceleration factor must be reflected and accumulated.

8 is a block diagram schematically illustrating a temperature analysis unit of the OLED deterioration prediction / compensation system according to the present invention.

Referring to FIG. 8, the temperature analysis unit 340 includes a sub-pixel analysis unit 332 for analyzing the temperature of each sub-pixel through a current input to each pixel, A temporal analysis 336 for analyzing the temperature difference over time, and a spatial analysis 338 for the characteristics of the panel and the pixel depending on the change in temperature influence.

The temperature acceleration factor 350 generated through the temperature analysis unit 340 is reflected and accumulated together with the current acceleration factor to predict the degree of deterioration.

FIG. 9A is a schematic view showing an image temperature distribution according to positions of an OLED panel according to the present invention, and FIG. 9B is a photograph schematically showing a reproduced image of an OLED panel according to the present invention.

As shown in FIG. 9A, the temperature distribution according to the position of the OLED panel differs depending on the image. That is, the temperature becomes higher and higher as it goes toward the center of the OLED panel, and the temperature becomes lower as it goes to the outside.

Thus, since the temperature distribution of the OLED panel does not coincide with the image, it is predicted and compensated by the temperature analysis of the image.

As shown in FIG. 9B, since the temperature distribution of the OLED panel is uneven, it can be seen that the temperature distribution is substantially good in the reproduced image by predicting and compensating the tendency thereof through the temperature analysis.

Although not shown in the drawings, since the calorific value differs depending on the characteristics of the OLED element in the sub-pixel analysis (refer to 332 in FIG. 8) constituting the temperature analysis unit (see 340 in FIG. 8) (R, G, B, W) according to the characteristics of the sub-pixels.

For example, since the amounts of heat generated by the red pixel R, the green pixel G, the blue pixel B, and the white pixel W are different from each other, The red pixel R, the green pixel G, the blue pixel B, and the blue pixel B, respectively, by reflecting currents at a ratio of, for example, 1.3, 0.7, 1.5, So that the same heat is generated in the white pixel W. At this time, even if the same current flows, the compensation value is applied differently according to the type of sub-pixel.

In the average calculation for each block (refer to 334 in FIG. 8) constituting the temperature analysis unit 340, the temperature is analyzed for each pixel of the OLED panel, and then the average temperature is calculated for each set block.

10 is a schematic diagram illustrating a temporal analysis of the temperature analysis unit of the OLED deterioration compensation system according to the present invention.

As shown in FIG. 10, in the temporal analysis (see 336 in FIG. 8) constituting the temperature analysis unit 340, since the amount of heat generation, that is, the amount of current varies depending on the pixel characteristics of the OLED panel, The rate of change is different.

Therefore, it reflects the temperature change rate over time reflecting the characteristics of each OLED panel. That is, the infinite impulse response filter (IIR filter) can be applied to calculate the current change rate to change slowly according to the temperature change rate.

FIG. 11A is a graph showing a change in temperature influence in a temperature distribution on an OLED panel according to the present invention, and FIG. 11B is a graph showing a change in temperature influence in a temperature distribution of each pixel of an OLED panel according to the present invention.

11A and 11B, in the spatial analysis (not shown, see 338 in FIG. 8) of the temperature analyzer 340, the temperature influence on the surrounding pixels differs for each pixel of the OLED panel. That is, as shown in Figs. 11A and 11B, a change in the temperature influence is shown in the transverse direction X and the longitudinal direction Y of the OLED panel.

Therefore, it reflects the heat transfer function according to the space by reflecting the characteristics of each OLED panel. That is, as shown in Fig. 11B, a high temperature distribution appears in the white portion, but a low temperature distribution appears in the slightly flowing portion.

Even if the temperature averages for each block calculated in FIG. 8 are completely the same, if the HTF is changed as shown in FIG. 11A, the temperature distribution can be adjusted differently for each pixel as shown in FIG. 11B.

This can reflect changes in the shape of the spatially varying temperature when the instrument configuration of the panel is changed to the finished product.

A driving method of an organic light emitting diode display device for predicting and compensating for deterioration using current accumulation will be briefly described as follows.

First, as a first step, a current corresponding to an input image is detected for each position of an OLED panel.

  Then, as a second step, the detected acceleration factors (see 330 in FIG. 3) and the temperature acceleration factors (see 350 in FIG. 3) are reflected and accumulated.

Thereafter, as a third step, the compensation value is applied to the device in accordance with the degree of deterioration predicted by estimating the degree of deterioration of the device.

In the first and second steps, input image data is inputted from the outside through the input image unit 200, and each gray value is converted into a current, and a current acceleration factor (see FIG. 3 330). Then, the temperature distribution of the image is calculated by reflecting the temperature acceleration factor (refer to 350 in FIG. 3) through the temperature analysis of the converted current, And accumulates the stress applied to the OLED element by reflecting the temperature analysis.

Then, in the step of converting the gray value into a current, the position of each pixel is determined using the signal of the data enable unit (see 230 in FIG. 5) The reference current LUT (see FIG. 5) which detects the reference current of each panel by the voltage through the gradation portion (see 210 in FIG. 5) and the gamma portion (see 220 in FIG. 5) (See 311 in FIG. 5). Thereafter, a current value from the reference current LUT 311 of the panel and a current value from the current-based LUT 313 are calculated to calculate a compensation value.

Further, in the step of calculating the temperature distribution of the image by reflecting the temperature acceleration factor (refer to 350 in FIG. 3) through the temperature analysis of the converted current, the temperature is analyzed for each sub-pixel through the current inputted for each pixel Then, the temperatures detected by the sub-pixel analysis are averaged for each block, and then the temperature difference is analyzed according to the time, and the characteristics of the panel and the pixel are analyzed according to the change of the temperature influence.

As described above, the sub-pixel analysis 332 of the temperature analysis unit 340, the block-by-block temperature average calculation 334 for calculating the temperatures detected by the sub-pixel analysis for each block, The temperature of each pixel of the OLED panel is analyzed through a spatial analysis 338 of the characteristics of the panel and the pixel according to the change of the temperature influence and then the temperature acceleration factor 350 is predicted .

The temperature acceleration factor 350 generated through the temperature analysis unit 340 is reflected and accumulated together with the current acceleration factor to predict the degree of deterioration.

In order to predict and compensate for the degree of deterioration using the current accumulation according to the present invention, the input image data (RGB) (not shown, refer to 200 in FIG. 3) (See FIG. 3, FIG. 3) and a temperature acceleration factor (not shown in FIG. 3, 350).

Thereafter, the OLED element predicts the degree of deterioration of the OLED element, and then compensates the OLED element by maintaining or updating the gray level of the input image data by applying a predetermined compensation value to the OLED element according to the predicted deterioration degree.

As described above, the organic light emitting diode display device and the driving method thereof according to the present invention detect a current according to an input image for each position of an OLED panel, reflect an acceleration factor and a temperature acceleration factor for each current, The residual image of the OLED can be removed by applying a compensation value to the OLED device according to the predicted degree of deterioration.

Although the embodiments have been described with reference to the drawings, the present invention is not limited thereto.

It is to be understood that the terms "comprises", "comprising", or "having" as used in the foregoing description mean that the constituent element can be implanted unless specifically stated to the contrary, But should be construed as further including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

150: a timing control unit 200:
300: deterioration prediction unit 310: current conversion unit
320: Stress conversion unit 330: Current acceleration factor
340: Temperature analysis unit 350: Temperature acceleration factor
360: cumulative calculation unit 400: deterioration compensation unit
500: output image portion

Claims (9)

An image display panel having a plurality of pixel regions;
A gate driver for driving gate lines of the image display panel;
A data driver driving 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;
After detecting the current according to the input image for each position of the image display panel, the compensation factor is applied to the device according to the degree of deterioration predicted by accumulating the acceleration factor and the temperature acceleration factor according to the current and estimating the degree of deterioration of the device And an organic light emitting diode (OLED) display device. The apparatus of claim 1, wherein the timing controller
A deterioration prediction unit for receiving input image data from an external source through an input image unit and for predicting a degree of deterioration for each pixel; a deterioration compensation unit for compensating deterioration according to the degree of deterioration predicted by the deterioration prediction unit; And an output image portion for applying the compensated value and outputting the compensated value. The apparatus of claim 1, wherein the degradation prediction unit
A current converter for receiving input image data from the outside through an input image unit and converting each gray value into a current, a stress conversion unit for converting the current into a stress by reflecting a current acceleration factor, A temperature analyzer for calculating a temperature distribution of an image by reflecting a temperature acceleration factor through a temperature analysis of the current converted through the current converter, and a temperature distribution through a current distribution and a temperature analyzer through the stress converter And an accumulation unit for accumulating the stress applied to the OLED element. 4. The apparatus of claim 3, wherein the current converter
A position determination unit for determining the position of each pixel using the signal of the data enable unit, a current LUT for each position for detecting a current for each pixel at each position, and a reference current for each panel by a voltage through the gradation unit and the gamma unit. A current calculator for calculating a compensation value by calculating a current value from the reference current LUT of the panel and a current value from the current LUT for each position; Wherein the organic light emitting diode display comprises a current generator for generating a current. 4. The apparatus of claim 3, wherein the temperature analyzer
A sub-pixel analysis for analyzing the temperature of each sub-pixel through the current input to each pixel, a temperature average calculation for each block that averages the temperatures detected by the sub-pixel analysis for each block, And a spatial analysis according to a change in a temperature influence of the panel and pixel characteristics. A first step of detecting a current according to an input image for each position of the image display panel;
A second step of reflecting the detected acceleration factors and temperature acceleration factors of the detected currents and accumulating them; And
And a third step of applying a compensation value to the device in accordance with the degree of deterioration predicted by predicting the degree of deterioration of the device. 7. The method of claim 6, wherein the first step and the second step comprise:
Receiving input image data from an outside through an input image unit and converting each gray value into a current,
Converting the converted current into a stress by reflecting a current acceleration factor,
Calculating a temperature distribution of the image by reflecting a temperature acceleration factor through temperature analysis of the converted current,
And accumulating the stress applied to the OLED element by reflecting the current distribution and the temperature analysis. 8. The method of claim 7, wherein the step of converting the gray value into a current comprises:
Determining a position of each pixel using a signal of a data enable unit;
Detecting a current for each pixel in each position by a current-based LUT;
Defining a reference current LUT that defines a reference current of each panel by a voltage through the gradation portion and the gamma portion;
And calculating a compensation value by calculating a current value from the reference current LUT of the panel and a current value from the current-dependent current LUT. The method as claimed in claim 7, wherein the step of calculating the temperature distribution of the image by reflecting the temperature acceleration factor through the temperature analysis of the converted current comprises:
Analyzing the temperature of each sub-pixel through a current input to each pixel;
Averaging the temperatures detected by the sub-pixel analysis for each block,
Analyzing a temperature difference over time,
And analyzing characteristics of the panel and the pixel according to a change in temperature influence.

Images