KR102290687B1 - Timing controller, organic light emitting display device including the same and method for compensating deterioration thereof - Google Patents

Abstract

A timing control unit capable of preventing deterioration of display quality due to deterioration of an organic light emitting diode by a high luminance shaping pattern in an organic light emitting display device is provided. The timing controller determines the logo area and the similar logo area from the image signal from the amount of change according to the degree of change of the image, and reduces the luminance level of the image in at least one of the logo area and the similar logo area to generate image data.

Description

Timing controller, organic light emitting display device including same, and method for compensating for deterioration thereof

The present invention relates to a timing controller, and more particularly, to a timing controller capable of accurately classifying a logo region and a similar logo region in an image displayed on an organic light emitting display device and compensating for a luminance level for at least one region, and an organic light emitting display including the same The present invention relates to a light emitting display device and a method for compensating for deterioration thereof.

Flat panel displays (FPDs) are used in various types of electronic products, including mobile phones, tablet PCs, and notebook computers. Flat panel displays include a liquid crystal display (LCD), a plasma display panel (PDP), an organic light emitting display (OLED), and the like, and recently an electrophoretic display ( EPD: ELECTROPHORETIC DISPLAY) is also widely used.

Among them, the organic light emitting display device (OLED) has advantages of fast response speed, high luminous efficiency, luminance, and a large viewing angle by using a self-emitting device that emits light by itself.

1 is a diagram illustrating a pixel structure of a general organic light emitting display device.

As shown in FIG. 1 , the pixel 10 of the organic light emitting diode display includes two or more switching elements ST and DT and an organic light emitting diode OLED.

The organic light emitting diode OLED has an anode electrode connected to a first power source VDD and a cathode electrode connected to a second power source VSS. The organic light emitting diode OLED generates light having a predetermined luminance in response to the current supplied from the second switching element DT.

Various circuits formed in the pixel 10 control the amount of current supplied to the organic light emitting diode OLED in response to the image signal supplied to the data line DL when the gate signal is supplied to the gate line GL.

To this end, the pixel 10 has a second switching device DT, a second switching device DT, a data line DL and a gate line connected between the first power source VDD and the organic light emitting device OLED. A capacitor C connected between the gate electrodes of the first switching element ST and the second switching element DT connected between the GLs and the organic light emitting element OLED is provided.

Since the organic light emitting display device having the above-described pixel 10 structure displays an image by driving the organic light emitting diode (OLED), which is a self-light emitting device, deterioration of the organic light emitting diode (OLED) proceeds due to various causes.

In other words, when a fixed pattern having a high luminance component, such as a logo, continuously appears in an image displayed on the organic light emitting display device, the pixel corresponding to the portion on which the shaped pattern is displayed due to the self-luminous characteristics of the organic light emitting diode (OLED). In (10), deterioration of the organic light emitting diode (OLED) occurs. Such deterioration of the organic light emitting diode (OLED) causes a difference in brightness and color in the display image, which causes an afterimage in the display image.

2 is a diagram illustrating an example of an image displayed on an organic light emitting display device.

As shown in FIG. 2 , in a specific portion of an image displayed on an organic light emitting diode display, a regular pattern having a high luminance component is continuously appearing. Here, area A of FIG. 2 is a logo area in which a regular pattern such as a logo is displayed, and area B is a similar logo area in which a regular pattern such as a subtitle bar or an information window is displayed.

As in regions A and B of FIG. 2 , when a high luminance component shape pattern is continuously displayed, deterioration of the organic light emitting diode (OLED) occurs in the pixel 10 of the organic light emitting display device corresponding to the region where the shaped pattern is output. In the process, an afterimage is generated in the display image according to this deterioration.

In order to prevent such deterioration of the organic light emitting diode (OLED), conventionally, a technique for detecting a logo area in a display image and reducing the luminance level of image data output to the detected logo area has been proposed.

However, the prior art has a problem in that it cannot accurately detect a logo area in a display image. For this reason, in the prior art, the luminance level of the image data is reduced even in the area other than the logo area, that is, the similar logo area, which deteriorates the quality of the displayed image.

For example, in the related art, both area A and area B of FIG. 2 are detected as logo areas. Then, an image correction operation for reducing the luminance level at the same rate is performed on all detected areas to prevent deterioration of the organic light emitting diode.

However, as described above, area A of FIG. 2 is a logo area, and area B is a similar logo area. In addition, the area A occupies a relatively small size in the display image compared to the area B, and the regular pattern displayed in the area A is displayed for a relatively long time compared to the regular pattern displayed in the area B.

Therefore, as in the prior art, when both area A and area B are detected as logo areas in the display image and the luminance level is equally reduced, area B, which has a relatively larger size than area A, appears darker than the surrounding area in the display image. As a result, there is a problem in that the quality of the displayed image is deteriorated.

The present invention can prevent deterioration of an organic light emitting diode by accurately classifying and detecting a logo area and a similar logo area in an image displayed on an organic light emitting display device, and performing differential luminance level reduction in the logo area and the pseudo logo area. An object of the present invention is to provide a timing controller, an organic light emitting diode display including the same, and a method for compensating for deterioration thereof.

The timing control unit of the present invention for achieving the above object includes a deterioration compensation module, and the deterioration compensation module includes an image analysis unit, an image determination unit and an image compensation unit.

The image analysis unit calculates the amount of change by analyzing the degree of change in the image in the image signal.

The image determining unit determines the logo area and the similar logo area from the image signal according to the calculated change amount.

The image compensator generates image data by decreasing the luminance level of an image signal region corresponding to at least one of the determined logo region and the similar logo region.

In the method for compensating for deterioration of an organic light emitting display device for achieving the above object, the amount of change calculated according to the degree of image change of the image signal is accumulated and stored, and the accumulated change amount is compared with a reference value to determine the logo area and the similar logo area, The image data is generated by reducing the luminance level of the image for at least one of the logo area and the similar logo area.

According to the present invention, the deterioration compensation module of the timing controller accurately detects the logo area and the pseudo-logo area in the image signal using a probabilistic model, and reduces the luminance level of the image corresponding to the logo area and the pseudo-logo area in the image signal. there is.

Accordingly, it is possible to prevent the organic light emitting diode from being deteriorated by continuously displaying the high-brightness shaped pattern in the image displayed on the organic light emitting display device.

In addition, the present invention can differentially reduce the luminance level of images corresponding to the detected logo area and the similar logo area, respectively.

Accordingly, since the luminance level of the similar logo area is reduced by a small reduction ratio compared to the logo area, it is possible to prevent deterioration of the display quality of the image displayed on the organic light emitting display device.

1 is a diagram illustrating a pixel structure of a general organic light emitting display device.
2 is a diagram illustrating an example of an image displayed on an organic light emitting display device.
3 is a diagram illustrating an organic light emitting display device according to an embodiment of the present invention.
FIG. 4 is a diagram illustrating an embodiment of the deterioration compensation module shown in FIG. 3 .
5 is a flowchart illustrating an operation of the deterioration compensation module shown in FIG. 4 .
6A is a diagram illustrating an example of a logo probability model.
6B is a diagram illustrating an example of detecting a logo area in an image signal according to a logo probability model.
FIG. 7 is a diagram illustrating another embodiment of the deterioration compensation module shown in FIG. 3 .
8 is a flowchart illustrating an operation of the deterioration compensation module shown in FIG. 7 .
9A is a diagram illustrating an example of a pseudo-logo probability model.
9B is a diagram illustrating an example of detecting a logo area and a similar logo area in an image signal according to a logo probability model and a similar logo probability model.

Hereinafter, a timing control unit according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a diagram illustrating an organic light emitting display device according to an embodiment of the present invention.

Referring to FIG. 3 , the organic light emitting diode display 100 may include a display panel 110 , a gate driver 120 , a data driver 130 , and a timing controller 140 .

The display panel 110 may include a plurality of gate lines GL and a plurality of data lines DL. A plurality of pixels, for example, a plurality of sub-pixels P, may be formed in regions where each of the plurality of gate lines GL and the plurality of data lines DL intersect. The plurality of sub-pixels P may include R, G, B, and W sub-pixels. The plurality of sub-pixels P may be arranged in various shapes, and each may output light of a unique color.

Each of the plurality of sub-pixels P may include a plurality of switching devices ST and DT and an organic light emitting device OLED. The plurality of switching devices ST and DT may include a switching transistor ST and a driving transistor DT.

The switching transistor ST may be connected to the gate line GL and the data line DL. The switching transistor ST may transmit a data signal applied through the data line DL to the driving transistor DT according to a gate signal applied through the gate line GL.

The driving transistor DT may be connected between the power supply voltage VDD and the organic light emitting diode OLED. The driving transistor DT may control the amount of current flowing from the power voltage VDD to the organic light emitting diode OLED according to the data signal transmitted from the switching transistor ST.

A capacitor C may be connected between the gate electrode of the driving transistor DT and the organic light emitting diode OLED. The capacitor C may maintain the operation of the organic light emitting diode OLED for one frame period.

In the organic light emitting diode OLED, an anode electrode may be connected to the driving transistor DT, and a cathode electrode may be connected to a ground voltage VSS. The organic light emitting diode OLED may generate and output light having a predetermined luminance according to the current supplied from the driving transistor DT.

The gate driver 120 may generate a gate signal according to the gate control signal GCS provided from the timing controller 140 . The gate driver 120 may sequentially output the gate signal to the plurality of gate lines GL of the display panel 110 . The gate driver 120 may be configured independently of the display panel 110 or may be configured in the form of a gate in panel (GIP) in the display panel 110 .

The data driver 130 may generate a data signal from the image data RGB' according to the data control signal DCS provided from the timing controller 140 . The data driver 130 may output a data signal to a plurality of data lines DL of the display panel 110 . Here, the data driver 130 may generate a data signal from the image data RGB' using a gamma voltage provided from a gamma voltage generator (not shown).

In addition, the image data RGB' provided from the timing controller 140 to the data driver 130 is luminance with respect to a specific region, for example, at least one region of the image signal RGB by the deterioration compensation module 150 to be described later. It may be data adjusted so that the level is lowered.

The timing controller 140 may generate a gate control signal GCS and a data control signal DCS according to a control signal provided from an external system (not shown).

The gate control signal GCS includes a gate start pulse GSP, a gate shift clock GSC, an output enable signal GOE, and the like, and is output to the gate driver 120 . The data control signal DCS includes a source start pulse SSP, a source sampling clock SSC, an output enable signal SOE, a polarity control signal POL, and the like, and is output to the data driver 130 .

The timing controller 140 may further include a deterioration compensation module 150 . The deterioration compensation module 150 may accurately classify and detect the logo area and the similar logo area in the image signal RGB provided from the external system.

In addition, the deterioration compensation module 150 adjusts the luminance level of at least one of the detected logo region and the similar logo region to obtain image data RGB′ including the logo region and the similar logo region in which the luminance level is reduced. can create The image data RGB' may be output to the data driver 130 .

For example, the image signal RGB may include a logo area including a regular pattern having a high luminance component and a similar logo area. The logo area occupies a smaller area in the image signal RGB than the similar logo area. However, the regular pattern of the logo area is continuously displayed for a longer period of time in the image signal RGB than that of the similar logo area.

The deterioration compensation module 150 accurately classifies and detects the logo area and the similar logo area in the image signal RGB, and the luminance level of the image signal RGB corresponding to at least one of the detected logo area and the similar logo area. may be reduced to generate image data RGB'.

The deterioration compensation module 150 reduces only the luminance level of the image signal RGB corresponding to the standard pattern of the logo area, or increases the luminance level of the image signal RGB corresponding to all the standard patterns of the logo area and the similar logo area. can be reduced

In this case, the luminance level of the image signal RGB corresponding to the shaping pattern of the logo area and the image signal RGB corresponding to the shaping pattern of the similar logo area may be reduced at different reduction ratios.

As described above, the deterioration compensation module 150 may generate the image data RGB' by reducing the luminance level of at least one of the logo region including the high luminance component shaping pattern and the similar logo region.

Accordingly, in the organic light emitting display device 100 of the present embodiment, the organic light emitting device (OLED) of each of the plurality of sub-pixels (P) displaying the fixed pattern by preventing the regular pattern of the high luminance component from being continuously displayed in the display image deterioration can be prevented.

Meanwhile, in the present embodiment, the configuration in which the deterioration compensation module 150 is included in the timing controller 140 has been described as an example, but the deterioration compensation module 150 may be configured separately from the timing controller 140 .

FIG. 4 is a diagram illustrating an embodiment of the deterioration compensation module shown in FIG. 3 .

Referring to FIG. 4 , the deterioration compensation module 150 may include an image analysis unit 210 , an image determination unit 220 , and an image compensation unit 230 .

The image analysis unit 210 may analyze an image signal input from the outside and output a change amount VA according to a change in the image. The image analysis unit 210 may include a frame memory 211 and an analysis unit 213 .

The frame memory 211 may store the input current frame image signal, for example, the first image signal RGB_N, and output a pre-stored previous frame image signal, for example, the second image signal RGB_(N-1). .

The analyzer 213 may analyze the first image signal RGB_N and the second image signal RGB_(N-1) output from the frame memory 211 to output the variation VA.

The analysis unit 213 analyzes the degree of change in the image between regions corresponding to each other of the first image signal RGB_N and the second image signal RGB_(N-1), and the amount of change ( VA) can be output.

The analysis unit 213 divides the first image signal RGB_N and the second image signal RGB_(N-1) into a plurality of blocks, respectively, and compares and analyzes the degree of change of the image between the blocks corresponding to each other to determine the amount of change ( VA) can be calculated. Here, the variation VA may be calculated for each of the plurality of blocks.

The image determination unit 220 may determine the logo area L_A in the image signal according to the change amount VA output from the image analysis unit 210 . The image determination unit 220 may include a storage unit 221 , a comparison unit 223 , and a determination unit 225 .

The storage unit 221 may accumulate and store the change amount VA output from the image analysis unit 210 . Previously, since the change amount VA is calculated for each block by the image analysis unit 210 , the storage unit 221 may accumulate and store the change amount VA for each block.

The comparison unit 223 may compare the accumulated change amount ΔVA stored in the storage unit 221 with the reference value Ref.

The determination unit 225 may detect at least one block corresponding to the cumulative change amount ΔVA according to the comparison result of the comparison unit 223 and determine the logo area L_A from among the detected blocks. The determination unit 225 may determine the logo area L_A from the detected block with reference to the logo probability model, for example, the first probability model PM1.

The image compensator 230 may reduce the luminance level of the image corresponding to the logo area L_A output from the image determination unit 220 in the first image signal RGB_N.

Here, the image compensator 230 may reduce the luminance level of the image corresponding to the logo area L_A according to the first reduction ratio. For example, the image compensator 230 may compensate the luminance level of the first image signal RGB_N so that the luminance level of the image corresponding to the logo area L_A is reduced by up to 70% from the original luminance level. The image compensator 230 may generate and output image data RGB_N' in which the luminance level of the logo area L_A is reduced from the first image signal RGB_N.

5 is a flowchart illustrating an operation of the deterioration compensation module shown in FIG. 4 .

4 and 5 , the image analysis unit 210 analyzes the degree of change in the image between the first image signal RGB_N and the second image signal RGB_(N-1), and the amount of change according to the result (VA) can be calculated and output. The change amount VA may be output to the image determination unit 220 and accumulated and stored (S10).

For example, the image analysis unit 210 divides the first image signal RGB_N and the second image signal RGB_(N-1) into a plurality of blocks, respectively, and divides the image between blocks corresponding to each other among the divided blocks. The degree of change can be analyzed. Here, each of the plurality of blocks may have a size including a plurality of pixels, and may have the same size in the first image signal RGB_N and the second image signal RGB_(N-1).

Also, the amount of change VA calculated by the image analysis unit 210 may have a value that is inversely proportional to the degree of change in the image. That is, as the degree of image change in the blocks corresponding to each other of the first image signal RGB_N and the second image signal RGB_N-1 increases, the change amount VA may be calculated to be close to zero. The variation VA may be calculated for each block, and may include position information of each block in the first image signal RGB_N or the second image signal RGB_(N-1).

Next, the image determination unit 220 may compare the accumulated change amount ΔVA accumulated in the storage unit 221 with the reference value Ref (S20). In addition, when the cumulative change amount ΔVA is greater than the reference value Ref, at least one block corresponding to the cumulative change amount ΔVA may be detected.

Here, the amount of change (VA) is a value inversely proportional to the degree of change in the image, so that the accumulated change amount (ΔVA) is greater than the reference value (Ref) includes a fixed pattern in which an image without motion, that is, an image of the corresponding block is continuously displayed. it can be seen that

Accordingly, the image determination unit 220 compares the cumulative change amount ΔVA with the reference value Ref, and detects at least one block corresponding to the cumulative change amount △VA greater than the reference value Ref according to the comparison result. can

Subsequently, the image determination unit 220 may determine whether the detected block is the logo area L_A ( S30 ).

The image determination unit 220 may compare whether the detected block corresponds to the first probability model PM1 and determine whether the detected block corresponds to the logo area L_A according to the result.

The first probability model PM1 is a probability distribution model for a position where the logo area L_A may appear in the image, and as shown in FIG. 6A , the first probability model PM1 is the upper left/right area of the image. can be defined as Accordingly, when the detected block is located in the area of the first probability model PM1 , the image determination unit 220 may determine the detected block as the logo area L_A.

6A and 6B , the image determination unit 220 may detect regions A and B in the first image signal RGB_N according to the comparison result between the cumulative change amount ΔVA and the reference value Ref. . The detected regions A and B may be regions including at least one block in which the accumulated change amount ΔVA is greater than the reference value Ref.

Next, the image determination unit 220 determines whether the detected area A and area B match the areas of the first probability model PM1, and according to the result, the area A can be detected as the logo area L_A. there is.

Here, area A and area B are areas including a high-luminance component stereotyped pattern, area A detected according to the first probability model PM1 is a logo area in which a broadcaster logo, etc. is displayed, and a first probability model PM1 The region B, which is not detected according to , may be a similar logo region in which a subtitle bar or an information window is displayed.

Referring back to FIGS. 4 and 5 , the image compensator 230 corresponds to the logo area L_A in the first image signal RGB_N according to the logo area L_A output from the image determination unit 220 . It is possible to reduce the luminance level of the image (S40). In addition, the image compensator 230 may output image data RGB_N' in which the luminance level of the logo area L_A is reduced.

As described above, the deterioration compensation module 150 according to the present embodiment includes at least one having a larger accumulated change amount (∆VA) than the reference value (Ref) in the accumulated change amount (∆VA) that is accumulated and stored according to the degree of change of the image. It is possible to detect a block of , and determine whether the detected block is the logo area L_A according to the first probability model PM1.

Accordingly, the deterioration compensation module 150 can reduce the luminance level by accurately detecting the logo area L_A in the image signal, and thus is included in the logo area L_A in the image displayed on the organic light emitting display device 100 . It is possible to prevent an afterimage from being generated by preventing the organic light emitting diode (OLED) from being deteriorated by the formed pattern.

In addition, since the deterioration compensation module 150 reduces only the luminance level of the logo area L_A in the image, the display quality of the image can be improved compared to the conventional one.

That is, in the related art, region A and region B are both detected as logo regions in the image of FIG. 6B and luminance compensation is performed to reduce the luminance level. In this case, region B in the display image occupies a relatively larger area than region A. Accordingly, the B area appears darker than the surrounding area by the conventional logo area luminance compensation, and thus the display quality of the image is deteriorated.

However, the present invention reduces the luminance level by detecting only region A as the logo region in the image of FIG. 6B according to the first probability model PM1, thus preventing the display quality from being deteriorated due to the decrease in the luminance level of region B in the related art. can do.

FIG. 7 is a diagram illustrating another embodiment of the deterioration compensation module shown in FIG. 3 .

The deterioration compensation module of this embodiment has a configuration substantially similar to that of the deterioration compensation module shown in FIG. 4 above. Accordingly, in FIG. 7 , the same members as those shown in FIG. 4 are denoted by the same reference numerals, and a detailed description thereof will be omitted.

Referring to FIG. 7 , the deterioration compensation module 151 of the present embodiment may include an image analysis unit 210 , an image determination unit 220 ′, and an image compensation unit 230 ′.

The image analyzer 210 is the same as the image analyzer shown in FIG. 4 above, and may include a frame memory 211 and an analyzer 213 .

The frame memory 211 may store the input current frame image signal, for example, the first image signal RGB_N, and output a pre-stored previous frame image signal, for example, the second image signal RGB_(N-1). .

The analyzer 213 may analyze the first image signal RGB_N and the second image signal RGB_(N-1) output from the frame memory 211 to output the variation VA.

The image determination unit 220 ′ may determine the logo area L_A1 and the similar logo area L_A2 in the image signal according to the variation VA output from the image analysis unit 210 . The image determination unit 220 ′ may include a storage unit 221 , a comparison unit 223 , a first determination unit 226 , and a second determination unit 227 .

The storage unit 221 may accumulate and store the change amount VA output from the image analysis unit 210 .

The comparison unit 223 may compare the accumulated change amount ΔVA stored in the storage unit 221 with the reference value Ref.

The first determination unit 226 may detect at least one block corresponding to the cumulative change amount ΔVA according to the comparison result of the comparison unit 223 and determine the logo area L_A1 from among the detected blocks. .

The first determination unit 226 may determine the logo area L_A1 from among the detected blocks with reference to the logo probability model, for example, the first probability model PM1.

The second determination unit 227 may detect at least one block corresponding to the cumulative change amount ΔVA according to the comparison result of the comparison unit 223 and determine the similar logo area L_A2 from among the detected blocks. there is.

The second determination unit 227 may determine the similar logo area L_A2 from among the detected blocks with reference to the similar logo probability model, for example, the second probability model PM2.

The image compensator 230' is configured to correspond to a corresponding area in the first image signal RGB_N, that is, a logo area L_A1, according to the logo area L_A1 and the similar logo area L_A2 output from the image determination unit 220'. and a luminance level of an image respectively corresponding to the similar logo area L_A2 may be reduced. The image compensator 230 ′ may include a first compensator 231 , a second compensator 233 , and an image synthesizer 235 .

The first compensator 231 may reduce the luminance level of the signal in the area corresponding to the logo area L_A1 in the first image signal RGB_N. The first compensation unit 231 may output the first compensation image RGB_N1 in which the luminance level of the logo area L_A1 is reduced according to the first reduction ratio.

The second compensator 233 may reduce a luminance level of a signal in an area corresponding to the pseudo-logo area L_A2 in the first image signal RGB_N. The second compensation unit 233 may output the second compensation image RGB_N2 in which the luminance level of the similar logo area L_A2 is reduced according to the second reduction ratio.

Here, the first reduction ratio of the first compensator 231 may have a greater value than the second reduction ratio of the second compensation part 233 .

For example, the first compensation unit 231 compensates so that the luminance level of the image corresponding to the logo area L_A1 is reduced at a first reduction ratio of up to 70% from the original luminance level, and outputs the first compensation image RGB_N1 can do. In addition, the second compensator 233 compensates for the luminance level of the image corresponding to the pseudo-logo area L_A2 to be reduced by a second reduction ratio of up to 20% from the original luminance level to compensate the second compensation image RGB_N2. can be printed out.

The image synthesizing unit 235 may output image data RGB_N' by synthesizing the first compensation image RGB_N1 and the second compensation image RGB_N2. The image data RGB_N' may be an image in which the luminance levels of the logo area L_A1 and the similar logo area L_A2 are reduced by different ratios in the first image signal RGB_N.

8 is a flowchart illustrating an operation of the deterioration compensation module shown in FIG. 7 .

7 and 8 , the image analysis unit 210 calculates and outputs the change amount VA according to the degree of change of the image, and the image determination unit 220 ′ accumulates and stores the output change amount VA. can be (S110).

The image analysis unit 210 divides the first image signal RGB_N and the second image signal RGB_(N-1) into a plurality of blocks, respectively, and the degree of image change between blocks corresponding to each other among the divided blocks. can be analyzed.

Here, each of the plurality of blocks may have a size including a plurality of pixels, and may have the same size in the first image signal RGB_N and the second image signal RGB_(N-1).

In addition, the amount of change VA may be calculated as a value inversely proportional to the degree of change in the image, and the change in the image in blocks corresponding to the first image signal RGB_N and the second image signal RGB_(N-1). As the degree increases, the variation VA may have a value close to zero.

Also, the variation VA may be calculated for each block, and may include position information of each block in the first image signal RGB_N or the second image signal RGB_(N-1).

Subsequently, the image determination unit 220' may compare the accumulated and stored accumulated change amount ΔVA with the reference value Ref (S120). In addition, when the cumulative change amount ΔVA is greater than the reference value Ref, at least one block corresponding to the cumulative change amount ΔVA may be detected. In other words, the image determination unit 220 ′ may detect at least one block having a cumulative change amount ΔVA greater than the reference value Ref.

Next, the image determination unit 220 ′ may determine whether the detected block is the logo area L_A1 according to the logo probability model, that is, the first probability model PM1 ( S130 ).

As described above with reference to FIG. 6A , the first probability model PM1 is a probability distribution model of a position where the logo area L_A1 may appear in the image, and may be defined as upper left/right upper regions of the image.

When the detected block is a block located in the area of the first probability model PM1 , the image determination unit 220 ′ may determine it as the logo area L_A1 .

Referring to FIGS. 6A and 9B , the image determination unit 220 ′ may detect regions A and B in the first image signal RGB_N according to the comparison result between the cumulative change amount ΔVA and the reference value Ref. there is. The detected regions A and B may be regions including at least one block in which the accumulated change amount ΔVA is greater than the reference value Ref.

Next, the image determination unit 220 determines whether the detected area A and area B match the areas of the first probability model PM1, and according to the result, the area A can be detected as the logo area L_A. there is. The area A detected according to the first probability model PM1 may be an area including blocks on which a high-brightness regular pattern such as a broadcaster logo is displayed.

Also, the image determination unit 220 ′ may determine whether the detected block is the similar logo area L_A2 according to the similar logo probability model, for example, the second probability model PM2 ( S140 ).

The second probability model PM2 may be a probability distribution model for a position where the similar logo area L_A2 may appear in the image. As shown in FIG. 9A , the second probability model PM2 may be defined as a region other than the central region of the image, that is, upper/lower/left/right regions.

When the detected block is a block located in the area of the second probability model PM2 , the image determination unit 220 ′ may determine it as the similar logo area L_A2 .

9A and 9B, the image determining unit 220' and the image determining unit 220' selects A from the first image signal RGB_N according to the comparison result between the cumulative change amount ΔVA and the reference value Ref. Regions and B regions can be detected. The detected regions A and B may be regions including at least one block in which the accumulated change amount ΔVA is greater than the reference value Ref.

Next, the image determination unit 220' determines whether the detected area A and area B match the areas of the second probability model PM2, and detects area B as the similar logo area L_A2 according to the result. can do. Region B detected according to the second probability model PM2 may be a region including blocks in which a high-brightness pattern is displayed, such as a subtitle bar or an information window.

Here, the logo area L_A1 and the similar logo area L_A2 detected by the image determination unit 220 ′ may be similar in that they include a regular pattern having a high luminance component. However, the logo area L_A1 occupies a relatively small area in the image compared to the similar logo area L_A2, and the display period in the image is relatively long.

The image compensator 230' reduces the luminance level of the image signal corresponding to the logo area L_A1 in the first image signal RGB_N according to the logo area L_A1 output from the image determination unit 220'. A first compensation image RGB_N1 may be generated ( S135 ).

For example, the image compensator 230 ′ reduces the luminance level of the signal corresponding to the logo area L_A1 in the first image signal RGB_N by up to 70% from the original luminance level to generate the first compensation image RGB_N1 . can do.

In addition, the image compensator 230 ′ corresponds to the image signal corresponding to the similar logo region L_A2 in the first image signal RGB_N according to the similar logo region L_A2 output from the image determination unit 220 ′. By decreasing the level, the second compensation image RGB_N2 may be generated ( S145 ).

For example, the image compensator 230 ′ reduces the luminance level of the signal corresponding to the pseudo-logo area L_A2 in the first image signal RGB_N by up to 20% from the original luminance level to generate the second compensation image RGB_N2 . can create

Subsequently, the image compensator 230 ′ may generate image data RGB_N′ by synthesizing the first compensation image RGB_N1 and the second compensation image RGB_N2 ( S150 ). The image data RGB_N' may be an image signal in which the luminance level of the image corresponding to the logo area L_A1 and the similar logo area L_A2 is reduced.

Meanwhile, in FIG. 8 , the image determination unit 220 ′ simultaneously detects the logo area L_A1 and the similar logo area L_A2 , but is not limited thereto. For example, the image determination unit 220 ′ may detect the logo area L_A1 from the first image signal RGB_N and then detect the similar logo area L_A2 .

In addition, the image compensator 230 ′ reduces the luminance level of the image corresponding to the logo region L_A1 in the first image signal RGB_N according to the first detected logo region L_A1 to obtain the first compensation image RGB_N1 . can create Next, the second compensation image RGB_N2 may be generated by reducing the luminance level of the image corresponding to the similar logo area L_A2 according to the similar logo area L_A2 detected in the first compensation image RGB_N1 . In addition, the second compensation image RGB_N2 may be output as image data RGB_N' in which the luminance levels of the logo area L_A1 and the similar logo area L_A2 are reduced.

As described above, the deterioration compensation module 151 of this embodiment has at least one block having a cumulative change amount ΔVA greater than the reference value Ref according to the first probability model PM1 and the second probability model PM2. Among them, the logo area L_A1 or the similar logo area L_A2 may be determined, and the luminance level of the image corresponding to each of the logo area L_A1 and the similar logo area L_A2 in the image signal may be reduced.

Accordingly, in the image displayed on the organic light emitting display device 100 , it is possible to prevent the organic light emitting diode OLED from being deteriorated by the shaping pattern included in each of the logo area L_A1 and the similar logo area L_A2 .

In addition, the deterioration compensation module 151 may reduce the luminance level of the image corresponding to each of the logo area L_A1 and the similar logo area L_A2 at a differential ratio, and accordingly, the organic light emitting display device 100 . display quality can be improved.

That is, in the organic light emitting display device 100 of the present invention, the luminance level of the pseudo-logo area L_A2 is reduced at a smaller rate than the logo area L_A1, so that a relatively larger area than the logo area L_A1 in the display image is obtained. It is possible to prevent the display quality from being deteriorated because the similar logo area L_A2 occupied is darker than the surrounding area.

Although many matters are specifically described in the foregoing description, these should be construed as examples of preferred embodiments rather than limiting the scope of the invention. Therefore, the invention should not be defined by the described embodiments, but should be defined by the claims and equivalents to the claims.

100: organic light emitting display device 110: display panel
120: gate driving unit 130: data driving unit
140: timing control unit 150, 151: deterioration compensation module
210: image analysis unit 220, 220': image determination unit
230, 230': image compensation unit

Claims (17)

an image analysis unit that calculates an amount of change according to the degree of change of the image signal;
an image determination unit for determining a logo area and a similar logo area from the image signal according to the change amount; and
and an image compensator for generating image data by reducing a luminance level of an image for at least one of the logo area and the similar logo area;
The video judgment unit,
a storage unit for accumulating and storing the change amount;
a comparison unit that compares the cumulative change amount with a reference value; and
a determination unit for detecting at least one area having the cumulative change amount greater than the reference value in the image signal according to a comparison result, and determining the logo area from among the at least one area according to a first probability model;
The first probability model includes predicted areas in which the logo area may appear in the image,
and the determination unit detects the at least one area as the logo area when the at least one area matches the predicted areas of the first probability model. According to claim 1,
The image analysis unit is a timing control unit for calculating the amount of change by analyzing the degree of change in regions corresponding to each other in the current frame image signal and the previous frame image signal. According to claim 1,
The timing controller calculates the amount of change as a value inversely proportional to the degree of change in the image. delete delete According to claim 1,
The image compensating unit is a timing control unit for decreasing a luminance level of a region corresponding to the logo region in the image signal. According to claim 1,
The determination unit determines the similar logo area among the at least one area according to a second probability model,
The second probability model includes predicted regions in which the similar logo region may appear in the image,
and the determination unit detects the at least one area as the similar logo area when the at least one area matches the predicted areas of the second probability model. 8. The method of claim 7,
The image compensator differentially decreases the luminance level of the region corresponding to the logo region and the region corresponding to the similar logo region in the image signal. According to claim 1,
The video compensator,
a first compensator for generating a first compensation image by decreasing a luminance level of an area corresponding to the logo area in the image signal according to a first reduction ratio;
a second compensator for generating a second compensation image by decreasing the luminance level of an area corresponding to the similar logo area in the image signal according to a second reduction ratio having a value smaller than the first reduction ratio; and
and an image synthesizing unit generating the image data by synthesizing the first compensated image and the second compensated image. display panel;
The amount of change is calculated according to the degree of change of the image signal, the logo area and the similar logo area are determined from the image signal according to the change amount, and the image luminance of at least one of the determined logo area and the similar logo area is determined. a timing controller for generating image data by decreasing the level; and
and a data driver for generating a data signal from the image data output from the timing controller and outputting it to the display panel;
The timing controller stores the accumulated change amount by accumulating the change amount, compares the accumulated change amount with a reference value, and detects at least one region in the image signal having the accumulated change amount greater than the reference value according to the comparison result, 1 Determine the logo area among the at least one area according to a probability model,
The first probability model includes predicted areas in which the logo area may appear in the image,
and the timing controller detects the at least one region as the logo region when the at least one region matches the predicted regions of the first probability model. calculating a change amount by analyzing the image change degree of the image signal, and accumulating and storing the calculated change amount;
comparing the accumulated change amount with a reference value and determining a logo area and a similar logo area in the image signal according to the comparison result; and
generating image data by reducing the luminance level of an image for at least one of the logo area and the similar logo area;
The step of determining the logo area and the similar logo area comprises:
detecting at least one region having the cumulative change amount greater than the reference value in the image signal;
comparing the at least one region with a first probability model including predicted regions in which the logo region may appear in the image; and
and determining the at least one area as the logo area when the at least one area matches the predicted areas of the first probability model. 12. The method of claim 11,
The amount of change is calculated by dividing each of the current frame image signal and the previous frame image signal into a plurality of blocks, and analyzing the degree of image change between blocks corresponding to each other among the plurality of blocks. 12. The method of claim 11,
The amount of change is calculated as a value inversely proportional to the degree of change of the image. 12. The method of claim 11,
The step of determining the logo area and the similar logo area,
comparing the at least one region with a second probability model including predicted regions in which the similar logo region may appear in the image; and
and determining the at least one area as the similar logo area when the at least one area matches the predicted areas of the second probability model. 15. The method of claim 14,
The step of generating the image data includes:
A method for compensating for deterioration of an organic light emitting display device for reducing a luminance level of an area corresponding to the logo area in the image signal. 15. The method of claim 14,
The step of generating the image data includes:
A method for compensating for deterioration of an organic light emitting display device for differentially reducing luminance levels of an area corresponding to the logo area and an area corresponding to the similar logo area in the image signal. 17. The method of claim 16,
The method for compensating for deterioration of an organic light emitting display device, wherein the area corresponding to the logo area is further reduced in luminance level than the area corresponding to the similar logo area.

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