KR102603591B1 - Organic Light Emitting Display Device and Method of Driving the same - Google Patents

Abstract

The present invention improves deterioration and afterimages by adjusting the compensation level based on the image situation and degree of deterioration, as well as delaying deterioration and increasing lifespan. For this purpose, the present invention has a compensation circuit that calculates the complexity of the N-1th frame image and the average amount of degradation of the Nth frame image and adjusts the compensation level according to the degree of degradation based on the results.

Description

Organic light emitting display device and method of driving the same}

The present invention relates to an organic electroluminescent display device and a method of driving the same.

As information technology develops, the market for display devices, which are a connecting medium between users and information, is growing. Accordingly, the use of organic light emitting displays (OLEDs) is increasing.

The organic light emitting display device includes a display panel including a plurality of subpixels, a driver that outputs a driving signal to drive the display panel, and a power supply that generates power to be supplied to the display panel and the driver. The driver includes a scan driver that supplies scan signals (or gate signals) to the display panel and a data driver that supplies data signals to the display panel.

When a driving signal, such as a scan signal or a data signal, is supplied to the subpixels formed on the display panel, the organic light emitting display device causes the selected subpixel to emit light, thereby displaying an image. However, in the case of organic electroluminescent displays, organic light emitting diodes included in the display panel deteriorate over time, so compensation for this is necessary.

Conventionally, a compensation method has been proposed that determines only the degree of deterioration of the organic light emitting diode and compensates accordingly. However, the conventionally proposed method causes a phenomenon in which the efficiency lifespan of the organic light-emitting diode decreases more rapidly, so improvement is required.

The present invention to solve the problems of the above-described background technology improves deterioration and afterimages by adjusting the compensation level based on the image situation and degree of deterioration, as well as delaying deterioration and increasing lifespan.

As a means of solving the above-described problems, the present invention provides an organic light emitting display device including a display panel, a data driver, and a compensation circuit. The display panel displays images. The data driver supplies data signals to the display panel. The compensation circuit calculates the complexity of the N-1th frame image and the average amount of degradation of the Nth frame image and adjusts the compensation level according to the degree of degradation based on the results.

The compensation circuit unit may calculate and calculate the average amount of degradation of the Nth frame based on the degradation compensation data of the N-1th frame.

The compensation circuit may match the complexity of the image of the N-1th frame on a pixel basis using an interpolation method and calculate the average amount of degradation on a pixel basis to calculate the average amount of degradation on a pixel basis.

The compensation circuit may lower the amount of compensation if the complexity of the image is high and increase the amount of compensation if the complexity of the image is low, based on the result of comparison between the complexity of the image in pixels and the average amount of degradation in each pixel.

The compensation circuit may determine the compensation level based on the average luminance that the display panel can currently display rather than the initial luminance of the display panel.

The compensation circuit determines the compensation level within a range within which an afterimage on the display panel is not recognized, and the range within which an afterimage is not recognized may be a value prepared through experiment.

The compensation circuit unit includes an image analysis unit that analyzes the image data of the N-1th frame, an operation unit that stores and loads the image data of the N-1th frame into a memory unit and performs calculations so that the image analysis unit analyzes the complexity of the image, An interpolation method calculation unit that matches the complexity of the image of the N-1th frame on a pixel basis using an interpolation method, and an average degradation amount that calculates and calculates the average degradation amount of the N-th frame based on the degradation compensation data of the N-1th frame. After comparing the complexity of the pixel-unit image output from the calculation unit and the interpolation calculation unit with the average degradation amount per pixel output from the average degradation calculation unit, the compensation level is adjusted according to the degree of degradation and the compensation value is output. May include wealth.

The compensation circuit unit may vary the luminance gain value of the Nth frame data based on the compensation value output from the compensation level control unit.

In another aspect, the present invention provides a method of driving an organic light emitting display device. The driving method of the organic light emitting display device includes calculating the complexity of the image of the N-1th frame, calculating the average amount of degradation of the Nth frame based on the degradation compensation data of the N-1th frame, and calculating the average degradation in pixel units. A step of calculating the amount, a step of matching the complexity of the image of the N-1th frame in pixel units using an interpolation method, and calculating the complexity of the image in pixel units and the average amount of degradation in pixel units, and calculating the degree of degradation based on the results. It includes the step of adjusting the compensation level according to.

In the step of adjusting the compensation level, the compensation amount can be lowered if the complexity of the image is high, and increased if the complexity of the image is low, depending on the result of comparison between the complexity of the image in pixel units and the average amount of degradation in pixel units.

The present invention has the effect of detecting a deterioration area and adjusting the compensation level based on the image situation and degree of deterioration of the detected area to improve deterioration and afterimages, delay deterioration, and extend lifespan. In addition, the present invention determines the compensation level within a range in which afterimages are not recognized, thereby preventing image quality degradation due to deterioration compensation. In addition, the present invention has the effect of improving display quality through appropriate compensation without overcompensation or undercompensation because the compensation level is determined based on the average deterioration line rather than the initial luminance.

1 is a block diagram schematically showing an organic electroluminescent display device.
FIG. 2 is a schematic configuration diagram of the subpixel shown in FIG. 1.
Figure 3 is a flow chart of a conventionally proposed degradation compensation method.
Figure 4 is an example of deterioration area detection according to a conventionally proposed method.
Figure 5 is a graph illustrating problems caused by a conventionally proposed degradation compensation method.
Figure 6 is a flowchart showing a method of driving an organic light emitting display device according to an embodiment of the present invention.
Figure 7 is a diagram for explaining a compensation method before applying an embodiment of the present invention.
Figure 8 is a diagram for explaining a compensation method after applying an embodiment of the present invention.
Figure 9 is an example of an afterimage recognition image and an afterimage non-recognition image.
Figure 10 is a graph showing the relationship between deterioration intensity according to the complexity of the image.
Figure 11 is a first configuration diagram of a compensation circuit according to an embodiment of the present invention.
Figure 12 is a second configuration diagram of a compensation circuit according to an embodiment of the present invention.
13 is a conceptual diagram of a compensation method according to an embodiment of the present invention.
14 is a graph for comparing and explaining output luminance for each pixel position.
15 is a graph illustrating a compensation method before applying an embodiment of the present invention.
16 is a graph illustrating a compensation method after applying an embodiment of the present invention.
Figure 17 is a diagram for explaining the difference before and after applying an embodiment of the present invention.

Hereinafter, specific details for implementing the present invention will be described with reference to the attached drawings.

The organic light emitting display device can be implemented in a top-emission, bottom-emission, or dual-emission manner depending on the direction of light emission.

Organic electroluminescent displays are either inverted staggered or staggered, including back channel etched (BCE) or etch stopper (ES), depending on the channel structure of the transistor. ) or can be implemented in a coplanar structure.

Organic electroluminescent displays can be implemented based on oxide, low-temperature polysilicon (LTPS), amorphous silicon (a-Si), or polysilicon (p-Si), depending on the semiconductor material of the transistor.

Organic electroluminescent displays can be implemented as navigation systems, video players, personal computers (PCs), wearables (watches, glasses, etc.), and mobile phones (smartphones).

FIG. 1 is a block diagram schematically showing an organic light emitting display device, and FIG. 2 is a configuration diagram schematically showing the subpixel shown in FIG. 1.

As shown in FIG. 1, the organic light emitting display device according to an embodiment of the present invention includes an image supply unit 110, a timing control unit 120, a scan driver 130, a data driver 140, and a display panel 150. ) is included.

The image supply unit 110 processes the data signal and outputs it together with a vertical synchronization signal, a horizontal synchronization signal, a data enable signal, and a clock signal. The image supply unit 110 supplies a vertical synchronization signal, a horizontal synchronization signal, a data enable signal, a clock signal, and a data signal to the timing control unit 120.

The timing control unit 120 receives data signals, etc. from the image supply unit 110, and controls the gate timing control signal (GDC) for controlling the operation timing of the scan driver 130 and the operation timing of the data driver 140. Outputs a data timing control signal (DDC) for The timing control unit 120 supplies the data signal DATA together with the data timing control signal DDC to the data driver 140.

The scan driver 130 outputs a scan signal while shifting the level of the gate voltage in response to the gate timing control signal (GDC) supplied from the timing controller 120. The scan driver 130 includes a level shifter and a shift register.

The scan driver 130 supplies scan signals to the subpixels SP included in the display panel 150 through the scan lines GL1 to GLm. The scan driver 130 may be formed in the display panel 150 in a gate-in-panel method or an integrated circuit (IC) form. The part of the scan driver 130 formed using the gate-in-panel method is a shift register.

The data driver 140 samples and latches the data signal DATA in response to the data timing control signal DDC supplied from the timing controller 120, and converts the digital signal into an analog signal in response to the gamma voltage and outputs it.

The data driver 140 supplies data signals to the subpixels SP included in the display panel 150 through the data lines DL1 to DLn. The data driver 140 may be formed in the form of an integrated circuit (IC).

The display panel 150 displays images in response to scan signals and data signals output from a driving unit including the scan driving unit 130 and the data driving unit 140. The display panel 150 is implemented in a flat, curved, or flexible form depending on the material of the substrate. In the display panel 150, subpixels SP located between two substrates emit light on their own in response to a driving current.

The subpixels SP include a red subpixel, a green subpixel, and a blue subpixel, or include a white subpixel, a red subpixel, a green subpixel, and a blue subpixel. The subpixels SP may have one or more different light emission areas depending on light emission characteristics.

As shown in FIG. 2, one subpixel includes a switching transistor (SW) connected to (or formed at the intersection of) the scan line (GL1) and the data line (DL1), and data supplied through the switching transistor (SW). A pixel circuit (PC) that operates in response to signals is included. The pixel circuit (PC) includes circuits such as a driving transistor, a storage capacitor, an organic light emitting diode, and a pixel compensation circuit to compensate for one of them.

The pixel compensation circuit is provided to compensate for the characteristics of the driving transistor (threshold voltage, current mobility, etc.), the characteristics of the organic light emitting diode (threshold voltage), or their deterioration. The pixel compensation circuit operates on its own or in conjunction with an external circuit. The pixel compensation circuit consists of one or more thin film transistors and capacitors. Since the pixel compensation circuit can be configured in many different ways depending on the compensation method, specific examples and descriptions thereof will be omitted.

When a driving signal, such as a scan signal or a data signal, is supplied to the subpixels formed on the display panel, the organic light emitting display device causes the selected subpixel to emit light, thereby displaying an image. However, in the case of organic electroluminescent displays, organic light emitting diodes included in the display panel deteriorate over time, so compensation for this is necessary.

Figure 3 is a flowchart of a conventionally proposed degradation compensation method, Figure 4 is an example of deterioration area detection according to the conventionally proposed method, and Figure 5 is a graph to explain problems according to the conventionally proposed degradation compensation method. am.

As shown in FIG. 3, a compensation method has been proposed that determines only the degree of deterioration of the organic light emitting diode and compensates accordingly. The conventionally proposed method senses deterioration of the organic light-emitting diode through a sensing step (S110) and compensates for the deteriorated organic light-emitting diode through a compensation step (S120).

The compensation step (S120) includes calculating the value sensed from the organic light emitting diode (S121), estimating the deteriorated organic light emitting diode based on the calculated value (S122), and compensating for the deteriorated glass light emitting diode ( S123) is included.

As shown in FIG. 4, the conventionally proposed method reduces afterimages by compensating for organic light emitting diodes present in deteriorated areas. However, the conventionally proposed method applies a higher voltage to the organic light emitting diode existing in the deteriorated area compared to the surrounding area.

As shown in (a) of FIG. 5, when the voltage is increased for compensation, the stress (OLED stress) experienced by the organic light emitting diode increases correspondingly. As a result, the afterimage is temporarily reduced by compensation of the organic light emitting diode. However, as shown in (b) of FIG. 5, the actual efficiency life of the organic light emitting diode decreases faster after compensation than before compensation, so improvement is required.

FIG. 6 is a flowchart showing a method of driving an organic light emitting display device according to an embodiment of the present invention, FIG. 7 is a diagram illustrating a compensation method before applying an embodiment of the present invention, and FIG. 8 is a flowchart showing a method of driving an organic light emitting display device according to an embodiment of the present invention. This is a drawing to explain a compensation method after applying an embodiment of the invention.

As shown in FIG. 6, the method of driving an organic light emitting display device according to an embodiment of the present invention calculates and calculates the complexity of the previous frame image and the average amount of degradation of the current frame image, and based on this, according to the degree of degradation. Adjust the reward level and determine the reward value.

When the image data of the N-1th frame (previous frame) is input (S210), the complexity of the image of the N-1th frame is calculated (S220). When calculating the complexity of the image of the N-1th frame, it can be done on a line-by-line or block-by-block basis. However, in the following, calculating the complexity of the image of the N-1th frame in block units is taken as an example.

Calculating the complexity of an image in block units can improve calculation speed compared to calculating the complexity of an image in a line unit. The minimum unit of a block can be set to 2 pixels in the horizontal direction * 2 pixels in the vertical direction or larger.

When the degradation compensation data of the N-1th frame (previous frame) is input (S215), the average amount of degradation of the N-th frame (current frame) is calculated and calculated based on the degradation compensation data of the N-1th frame (S225) ).

The step of calculating the average amount of degradation of the Nth frame may be performed together with calculating the complexity of the image of the N-1th frame. However, this may be done before or after the complexity calculation of the image of the N-1th frame.

The deterioration compensation data of the N-1th frame is a value prepared by the compensation system of the organic light emitting display device. For example, the deterioration compensation data of the N-1th frame corresponds to deterioration compensation data prepared to sense the display panel and compensate for its deterioration during the previous frame.

The step of calculating the average amount of deterioration of the Nth frame is based on the value prepared by the compensation system of the organic light emitting display device (deterioration compensation data of the N-1th frame). Calculate the amount.

In the step of calculating the average deterioration amount of the Nth frame, if the deterioration compensation data of the N-1th frame and the image data of the Nth frame are entered using a lookup table prepared through experiment, the average deterioration amount of the Nth frame is calculated. You can use a conversion formula that is automatically calculated and output.

When calculating the average amount of degradation of the Nth frame, it can be done on a line-by-line, block-by-block, or pixel-by-pixel basis. However, hereinafter, calculating the average deterioration amount of the Nth frame on a pixel basis will be explained as an example.

The complexity of the image of the N-1th frame is expanded in pixel units using interpolation (S230). By calculating the complexity of the image of the N-1th frame in blocks and then expanding (matching) it to pixels, it is possible to estimate and detect areas with many irregular or complex edges in the image data while minimizing memory usage.

In addition, it is possible to estimate and detect the boundary between areas where luminance deviation is severe and areas where luminance deviation is not severe. In addition, the complexity of the entire image of the display panel can be obtained using the interpolation method.

The compensation level is adjusted according to the complexity of the pixel image and the degree of deterioration compared to the average amount of deterioration per pixel (S240), and the compensation value is determined and applied (S250). Comparing the complexity of the pixel image and the average amount of degradation per pixel, compensation can be made only for areas where the complexity of the image is judged to be high and where the degree of deterioration is more severe than other areas.

Additionally, when compensation is necessary, the compensation level (compensation amount) can be adjusted within a range where the afterimage on the display panel is not recognized, and compensation can be applied with the final compensation value. The compensation value may be prepared as a gain value that varies the luminance gain of the data signal.

The compensation value is applied to the image data of the Nth frame, which is the next frame image data. The range in which the afterimage on the display panel is not recognized corresponds to the numerical value (experimental value) prepared through experiment.

As shown in Figure 7, if the compensation method before applying an embodiment of the present invention is followed, the same compensation level as other areas is determined even for areas with high complexity of the image (all areas are compensated with the same deterioration intensity). . Accordingly, in the left image, the compensation value (Gain) is determined to be 1 in both areas with high image complexity and areas with low image complexity.

As shown in FIG. 8, according to the compensation method after applying an embodiment of the present invention, a lower compensation level is determined for areas with high complexity of the image than other areas (compensated with different deterioration intensities for each area). Accordingly, in the left image, the compensation value (Gain) of the area with high image complexity is determined to be 0.85, but the compensation value (Gain) of the area with low image complexity is determined to be 1.

As such, an embodiment of the present invention calculates the complexity of the image and the average amount of degradation, adjusts the compensation level according to the degree of degradation based on this, and applies the compensation value, so that if the complexity of the image is determined to be high, the afterimage is not recognized. The compensation value can be varied within the range.

The compensation method of one embodiment of the present invention determines the compensation level according to the complexity of the image, so it is easy to compensate for areas showing strong edges (such as logo areas) or areas where the image is highly irregular.

Figure 9 is an example diagram of an afterimage-recognized image and an afterimage-unrecognized image, and Figure 10 is a graph showing the relationship between deterioration intensity according to the complexity of the image.

The method of driving an organic light emitting display device according to an embodiment of the present invention may not perform compensation for an image environment in which afterimages are recognized, as shown on the left side of FIG. 9. On the other hand, compensation can be performed in an image environment where afterimages are not recognized, as shown on the right side of FIG. 9.

The level of compensation can be determined depending on the complexity and intensity of degradation of the image. However, as shown in the graph of FIG. 10, if there is a difference in deterioration of more than 0.2 (20%) compared to the surrounding deterioration, compensation can be performed even if the complexity of the image is high. In other words, if the deterioration difference is within 20%, there may be more room for luminance compensation depending on the complexity of the image. Therefore, if the deterioration difference exceeds the set value compared to the special surrounding deterioration, compensation may be performed even if the image complexity is high. there is. At this time, the set value is prepared through experiment.

FIG. 11 is an exemplary diagram of a first configuration of a compensation circuit according to an embodiment of the present invention, FIG. 12 is an exemplary diagram of a second configuration of a compensation circuit according to an embodiment of the present invention, and FIG. 13 is an exemplary diagram of an embodiment of the present invention. This is a conceptual diagram of a compensation method according to an example, FIG. 14 is a graph for comparing and explaining the output luminance for each pixel position, FIG. 15 is a graph for explaining the compensation method before applying an embodiment of the present invention, and FIG. 16 is a graph for explaining the compensation method after applying an embodiment of the present invention, and Figure 17 is a graph for explaining the difference before and after applying an embodiment of the present invention.

As shown in FIG. 11, the compensation circuit unit 160 according to an embodiment of the present invention includes an image analysis unit 161, a block operation unit 162, a memory unit 163, a block interpolation operation unit 164, and an average deterioration operation unit. It includes a quantity calculation unit 165, a compensation level adjustment unit 167, and a compensation value application unit 168.

The video analysis unit 161 analyzes video data (DATA) of the N-1th frame input from the outside. When calculating the complexity of the image of the N-1th frame, the image analysis unit 161 may proceed on a line-by-line or block-by-block basis.

However, in the following, calculating the complexity of the image of the N-1th frame in block units is taken as an example. The image analysis unit 161 is linked with the block operation unit 162 and the memory unit 163 for image analysis.

The block operation unit 162 stores the image data (DATA) of the N-1th frame input from the outside in the memory unit 163 and loads it in block units so that the image analysis unit 161 can analyze the complexity of the image. Let it happen.

The block interpolation operation unit 164 expands (matches) the complexity of the image of the N-1th frame on a pixel basis using an interpolation method. The block interpolation calculation unit 164 calculates the complexity of the image of the N-1th frame in blocks and then expands it in pixel units.

Using the block interpolation operation unit 164, it is possible to estimate and detect areas with many irregular or complex edges in the image data while minimizing memory usage. In addition, it is possible to estimate and detect the boundary between areas where luminance deviation is severe and areas where luminance deviation is not severe. In addition, the complexity of the entire image of the display panel can be obtained using the interpolation method.

The average deterioration amount calculation unit 165 calculates and calculates the average deterioration amount of the N-th frame based on the deterioration compensation data (DDATA) of the N-1th frame. The deterioration compensation data (DDATA) of the N-1th frame corresponds to a value prepared by the compensation system of the organic light emitting display device.

The compensation system includes a data driver that operates in conjunction with a pixel compensation circuit included in a subpixel, a timing control unit (or compensation circuit unit) that controls the data driver, and the like. Therefore, the value prepared by the compensation system is a compensation data value prepared by sensing.

The average deterioration amount calculation unit 165 calculates and calculates the average amount of deterioration for actual image display based on the value provided by the compensation system of the organic light emitting display device. The average deterioration amount calculation unit 165 calculates the average deterioration amount of the entire area of the display panel. The average deterioration amount calculation unit 165 may calculate the average deterioration amount using a lookup table provided in the memory unit 163 so that the average deterioration amount is automatically calculated and output.

When calculating the average amount of degradation of the Nth frame, it can be done on a line-by-line, block-by-block, or pixel-by-pixel basis. However, hereinafter, calculating the average deterioration amount of the Nth frame on a pixel basis will be explained as an example.

The compensation level control unit 167 compares the complexity of the pixel-wise image output from the block interpolation operation unit 164 with the average amount of degradation per pixel output from the average degradation amount calculation unit 165, and then sets a compensation level according to the degree of degradation. Adjust. The compensation level control unit 167 adjusts the compensation level (compensation amount) for parts of the image that are judged to have high complexity and parts that require compensation, and outputs a compensation value when the compensation level is determined.

The compensation value application unit 168 generates a compensation data signal CDATA by varying the luminance gain value of the data signal based on the compensation value output from the compensation level adjustment unit 167. The compensation data signal CDATA generated from the compensation value application unit 168 is supplied to the data driver through the timing control unit or directly to the data driver.

As shown in FIG. 12, a portion of the compensation circuit unit 160 may be included in the logic circuit of the timing control unit 120. In this case, the timing control unit 120 directly generates the compensation data signal (CDATA) and then supplies it to the data driver.

As shown in FIGS. 11 to 13, the compensation circuit unit 160 can lower the compensation amount when the complexity of the image (IMG) displayed on the display panel 150 is high, while compensation is provided when the complexity of the image (IMG) is low. The amount can be increased.

As shown in Figure 14 (a), the initial luminance of the display panel (organic light emitting diode) appears consistently at all pixel positions, that is, in the entire area of the display panel. However, the organic light emitting diode included in the pixel deteriorates over time. And the deterioration of organic light emitting diodes varies depending on the frequency of use, emission time, etc. Accordingly, as shown in (b) of FIG. 14, the current luminance is lower than the initial luminance depending on the degree of deterioration of the organic light emitting diode.

When the state before and after deterioration of the display panel is as above, the difference before and after applying an embodiment of the present invention is explained as follows.

As shown in FIG. 15, according to the compensation method before applying an embodiment of the present invention, the compensation amount is determined based on the initial luminance. As shown in FIG. 16, according to the compensation method after applying an embodiment of the present invention, the amount of compensation is determined based on the average deterioration line (average luminance that the display panel can currently display) rather than the initial luminance. If compensation is performed based on the deterioration average line, appropriate compensation can be performed without overcompensation or undercompensation, thereby improving display quality.

Figure 17 (a) corresponds to a case where the compensation method of an embodiment of the present invention is not followed, and Figure 17 (b) corresponds to a case where the compensation method of an embodiment of the present invention is followed. In Figure 17, L means luminance and t means time. In FIG. 17, Ta and Tb refer to the deterioration delay time after luminance compensation, and Ga and Gb refer to the luminance compensation amount (i.e., luminance gain value).

In Figure 17 (a), the brightness compensation amount is higher than in Figure 17 (b), and the deterioration delay time after luminance compensation (the shorter the deterioration delay time, the shorter the time for compensation) is shorter than in Figure 17 (b).

As the deterioration graph of the organic light emitting diode shown in FIG. 17 indicates, applying the compensation method of an embodiment of the present invention can lower the luminance compensation amount compared to the previous one, thereby reducing the effect of delaying deterioration (increasing the deterioration delay time) of the entire area of the display panel. It can be raised.

The present invention has the effect of detecting a deterioration area and adjusting the compensation level based on the image situation and degree of deterioration of the detected area to improve deterioration and afterimages, delay deterioration, and extend lifespan. In addition, the present invention determines the compensation level within a range in which afterimages are not recognized, thereby preventing image quality degradation due to deterioration compensation. In addition, the present invention has the effect of improving display quality through appropriate compensation without overcompensation or undercompensation because the compensation level is determined based on the average deterioration line rather than the initial luminance.

Although embodiments of the present invention have been described with reference to the accompanying drawings, the technical configuration of the present invention described above can be modified by those skilled in the art in the technical field to which the present invention belongs in other specific forms without changing the technical idea or essential features of the present invention. You will understand that it can be done. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. In addition, the scope of the present invention is indicated by the claims described later rather than the detailed description above. In addition, the meaning and scope of the patent claims and all changes or modified forms derived from the equivalent concept should be construed as being included in the scope of the present invention.

110: video supply unit 120: timing control unit
130: scan driver 140: data driver
150: display panel 160: compensation circuit unit
161: Image analysis unit 162: Block operation unit
163: memory unit 164: block interpolation operation unit
167: Compensation level control unit 168: Compensation value application unit
165: Average deterioration amount calculation unit

Claims (10)

A display panel that displays images;
a data driver that supplies data signals to the display panel; and
Comprising a compensation circuit unit that calculates the complexity of the N-1th frame image and the average amount of degradation of the Nth frame image and adjusts the compensation level according to the degree of degradation based on the results,
The compensation circuit is
Matching the complexity of the image of the N-1th frame on a pixel basis using interpolation,
Calculating the average amount of degradation on a pixel basis to calculate the average amount of degradation on a pixel basis,
According to the result of comparison between the complexity of the pixel image and the average amount of degradation per pixel, if the complexity of the image is high, the compensation amount is lowered, and if the complexity of the image is low, the compensation amount is increased;
The compensation level is determined within a range in which the afterimage on the display panel is not recognized, and the range in which the afterimage is not recognized is a value prepared through experiment. According to paragraph 1,
The compensation circuit is
An organic light emitting display device that calculates and calculates the average amount of degradation of the N-th frame based on the degradation compensation data of the N-1th frame. delete delete According to paragraph 1,
The compensation circuit is
An organic light emitting display device that determines the compensation level based on the average luminance that the display panel can currently display rather than the initial luminance of the display panel. delete According to paragraph 2,
The compensation circuit is
An image analysis unit that analyzes image data of the N-1th frame,
an operation unit that stores and loads the image data of the N-1th frame into a memory unit and calculates the image analysis unit to analyze the complexity of the image;
An interpolation calculation unit that matches the complexity of the image of the N-1th frame on a pixel basis using interpolation,
an average deterioration amount calculation unit that calculates and computes an average deterioration amount of the N-th frame based on the deterioration compensation data of the N-1th frame;
Comprising a compensation level control unit that compares the complexity of the pixel-wise image output from the interpolation calculation unit with the average pixel-wise degradation amount output from the average degradation amount calculation unit, then adjusts the compensation level according to the degree of degradation and outputs a compensation value. Organic electroluminescence display device. In clause 7,
The compensation circuit is
An organic light emitting display device that varies the luminance gain value of the Nth frame image based on the compensation value output from the compensation level control unit. Calculating the complexity of the image of the N-1th frame;
calculating an average amount of degradation of the Nth frame based on the degradation compensation data of the N-1th frame and calculating an average amount of degradation in pixel units;
Matching the complexity of the image of the N-1th frame on a pixel basis using an interpolation method; and
Comprising the step of calculating the complexity of the image per pixel and the average amount of degradation per pixel and adjusting the compensation level according to the degree of deterioration based on the results,
The step of adjusting the compensation level is
According to the result of comparison between the complexity of the pixel image and the average amount of degradation per pixel, if the complexity of the image is high, the compensation amount is lowered, and if the complexity of the image is low, the compensation amount is increased;
A method of driving an organic light emitting display device wherein the compensation level is determined within a range in which an afterimage on the display panel including the pixel is not recognized, and the range in which the afterimage is not recognized is a value prepared through experiment.
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