KR20160056708A - Apparatus for compensating degradation and display device including the same - Google Patents

Abstract

Provided are a degradation compensating device which can accurately detect a logo region even in a video image as well as a still image by detecting the logo region using 3D depth map information, and can prevent logo colors from being distorted by converting a logo in the detected logo region into a transparent logo with low luminance, and a display device including the same. The degradation compensating device includes a depth map extracting unit, a logo region detecting unit, a color analyzing unit, and a gray scale level adjusting unit.

Description

[0001] The present invention relates to a deterioration compensation apparatus and a display apparatus including the same,

More particularly, the present invention relates to a deterioration compensation apparatus capable of compensating for deterioration of an organic light emitting element caused by a logo having a high luminance component in an organic light emitting display, and a display apparatus including the deterioration compensating apparatus. .

Flat panel displays (FPDs) are used in various types of electronic products including mobile phones, tablet PCs, and notebook computers. The flat panel display includes a liquid crystal display (LCD), a plasma display panel (PDP), and an organic electroluminescence display (OLED). Recently, an electrophoretic display device EPD: ELECTROPHORETIC DISPLAY) is also widely used.

The organic light emitting diode (OLED) has advantages of high response speed, light emitting efficiency, luminance and viewing angle by using a self-luminous element which emits light by itself.

1 is a view showing a pixel structure of a general organic light emitting display device.

1, a pixel 10 of an organic light emitting display includes at least two switching elements ST and DT and an organic light emitting diode OLED.

In the organic light emitting diode OLED, the anode electrode is connected to the first power supply VDD and the cathode electrode is connected to the second power supply VSS. The organic light emitting diode OLED generates light of a predetermined luminance corresponding to the current supplied from the second switching device DT.

The various circuits formed in the pixel 10 control an amount of current supplied to the organic light emitting diode OLED corresponding to a video signal supplied to the data line DL when a gate signal is supplied to the gate line GL. To this end, the pixel 10 includes a second switching device DT, a second switching device DT, a data line DL, and a gate line (not shown) connected between the first power source VDD and the organic light emitting device OLED And a capacitor C connected between the gate electrode of the first switching device ST and the second switching device DT and the organic light emitting device OLED connected between the organic light emitting device OL and the OLED.

Since the organic light emitting display having the above-described pixel 10 structure uses the organic light emitting diode (OLED), which is a self-luminous element, deterioration of the pixel 10 progresses due to various causes. Due to the deterioration of the pixel 10, a difference in brightness and color is recognized in the organic light emitting display device, and a permanent afterimage remains.

That is, when the same image of high luminance is continuously applied due to the self-light emission characteristic of the organic light emitting diode OLED, deterioration occurs due to an object having a predetermined shape, and thus a still image that is recognized as a residual image is generated do. Such a static residual image becomes worse as the organic light emitting device (OLED) deteriorates.

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

2 (a) and 2 (b), the logo 1 is output to a specific portion of the image displayed in the organic light emitting display device. This logo (1) has a high luminance component.

2 (a) and 2 (b), when the logo 1 of the high luminance component is continuously output in a certain region, the organic light emitting device OLED corresponding to the region in which the logo 1 is output . The deterioration of the organic light emitting diode OLED remains as a residual image even if the logo 1 disappears from the displayed image as shown in FIG. 2C.

An object of the present invention is to provide a degradation compensation apparatus capable of reducing a brightness level of a logo region after detecting a logo region in an image.

According to an aspect of the present invention, a deterioration compensation apparatus includes a depth map extracting unit, a logo region detecting unit, a color analyzing unit, and a gradation level adjusting unit.

The depth map extraction unit extracts depth map information of the input image. The logo area detection unit detects a logo area including the logo in the input image from the depth map information. The color analysis unit predicts the color of the peripheral region of the logo region to generate a background color. The grayscale level controller adjusts the grayscale level of the logo according to the background color to generate a translucent logo of low brightness.

The degradation compensation apparatus according to the present invention can detect the logo region included in the video signal using the 3D depth map information of the image and accurately detect the logo region in the still image and the moving image to reduce the brightness level of the logo.

Further, the deterioration compensation apparatus reduces the logo of the detected logo region to a low brightness level using the color of the peripheral region, increases the white component to generate a translucent logo of low brightness, Distortion can be prevented.

1 is a view showing a pixel structure of a general organic light emitting display device.
2 is a diagram showing an example of an image displayed on an organic light emitting display device.
3 is a view illustrating an organic light emitting display according to an embodiment of the present invention.
4 is a diagram showing a configuration of the deterioration compensating unit shown in FIG.
5 is an operational flowchart of the deterioration compensating unit.
6 is an exemplary view of the operation of the color analysis unit.
7 is an exemplary view showing the operation of the deterioration compensating unit.

Hereinafter, a deterioration compensation apparatus and a display device including the deterioration compensation apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

For convenience of explanation, an example in which the deterioration compensation device is applied to the organic light emitting display device will be described in the present invention. However, the present invention is not limited thereto, and it will be obvious that a deterioration compensation device can be applied to a liquid crystal display device and the like in addition to the organic light emitting display device.

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

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

The display panel 110 may include a plurality of gate lines GL and a plurality of data lines DL. In addition, a plurality of sub-pixels 115 may be formed in each of the intersecting regions of the plurality of gate lines GL and the plurality of data lines DL. The plurality of subpixels 115 may comprise W subpixels, R subpixels, G subpixels, and B subpixels. The arrangement of the plurality of subpixels 115 can be variously changed, and each can output light of a unique color.

Each of the plurality of sub-pixels 115 may be composed of a plurality of switching elements ST and DT and an organic light emitting element OLED.

The plurality of switching elements ST and DT are connected to the gate line GL and the data line DL to supply a video signal supplied through the data line DL when the gate signal is supplied from the gate line GL, The amount of current supplied to the organic light emitting diode OLED can be controlled corresponding to the signal. The plurality of switching elements ST and DT may include a switching transistor ST and a driving transistor DT.

The switching transistor ST may be connected between the gate line GL, the data line DL and the driving transistor DT. The switching transistor ST may transmit the data signal to the driving transistor DT in accordance with the gate signal.

The driving transistor DT may be connected between the first power supply VDD and the organic light emitting diode OLED. The driving transistor DT may control an amount of current supplied from the first power source VDD to the organic light emitting diode OLED according to a data signal provided 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.

In the organic light emitting device OLED, the anode electrode may be connected to the driving transistor DT, and the cathode electrode may be connected to the second power source VSS. The organic light emitting diode OLED can generate and output light of a predetermined luminance according to the current supplied from the driving transistor DT.

The gate driver 120 generates a gate signal according to the gate control signal GCS provided from the timing controller 140 and sequentially outputs the generated gate signal to each of the plurality of gate lines GL of the display panel 110 can do. The gate driver 120 may be formed independently of the display panel 110 or may be mounted in the display panel 110.

The data driver 130 generates a data signal from the image data RGB 'according to the data control signal DCS provided from the timing controller 140 and supplies the generated data signal to a plurality of data lines DL, respectively. The data driver 130 may generate a data signal from the image data RGB 'using a gamma voltage supplied from a gamma voltage generator (not shown).

On the other hand, the image data RGB 'provided to the data driver 130 is converted into a gray level by the degradation compensation unit 150 to be described later, that is, the brightness level of a region including a specific part of the image, The image data may be image data adjusted so as to be read.

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 and the data control signal DCS may be output to the gate driver 120 and the data driver 130, respectively.

The gate control signal GCS may include a gate start pulse GSP, a gate shift clock GSC, an output enable signal GOE, and the like. The data control signal DCS may include a source start pulse SSP, a source sampling clock SSC, an output enable signal SOE, a polarity control signal POL, and the like.

The timing control unit 140 may further include a deterioration compensation unit 150. [ The deterioration compensating unit 150 may generate the image data RGB 'by adjusting the gradation level of a specific region in which the logo or the like exists among the image signals RGB provided from the external system. The image data RGB 'generated by the deterioration compensating unit 150 may be output to the data driver 130.

For example, the logo included in the image signal (RGB) may be a high gradation level for all the subpixels 115 displaying a high brightness component, i.e., a logo. When such a logo is displayed for a long time at the same position on the screen of the display panel 110, the organic light emitting element OLED of the portion is deteriorated.

Accordingly, the deterioration compensating unit 150 detects the region in which the logo exists in the image signal RGB and then generates the image data RGB 'by lowering the luminance level of the detected logo region, that is, the gradation level, It is possible to prevent the organic light emitting diode OLED from being deteriorated in the display panel 110.

In addition, the deterioration compensating unit 150 can reduce the gradation level of the logo region and generate the logo region in a translucent manner, thereby preventing degradation of the organic light emitting diode OLED and preventing the logo color from being visually perceived.

FIG. 4 is a diagram showing the configuration of the deterioration compensator shown in FIG. 3, and FIG. 5 is a flowchart showing the operation of the deterioration compensator.

3 to 5, the deterioration compensating unit 150 includes a depth map extracting unit 151, a logo area detecting unit 152, a color analyzing unit 153, a gradation level adjusting unit 154, And an image synthesizing unit 155. [

The depth map extracting unit 151 can detect the depth map information of the image from the input image signal RGB (S10).

The depth map extracting unit 151 can detect 3D depth map information from the video signal RGB in accordance with the luminance, vanishing point position, sharpness, etc. of the video signal RGB. The 3D depth map information can be detected for each frame of the video signal RGB.

The logo area detecting unit 152 can detect a logo area including the logo in the image signal RGB from the depth map information detected by the depth map extracting unit 151 (S20).

Generally, the logo included in the image is a state in which letters or symbols are artificially inserted. Accordingly, when the depth map extracting unit 151 detects the depth map information from the image signal RGB, the logo appears as a positive component in the depth map information.

Accordingly, the logo area detecting unit 152 can detect, as the logo area, an area including the object having the positive component from the depth map information. The logo area detecting unit 152 can detect a logo area including an object having a high brightness and sharpness in the depth map information or a positive vanishing point position. The logo area detecting unit 152 can detect the logo area in units of pixels from the depth map information.

In addition, the logo area detection unit 152 may accumulate the depth map information provided for each frame for a predetermined time, and then detect the logo area from the accumulated depth map information. That is, even if the frame changes in the accumulated depth map information, if there is an object that appears as a positive component at the same position, that is, if the amount of change of the positive component of the object is 0 at the same position, Logo area can be detected.

As described above, the logo area detecting unit 152 of the present embodiment can increase the accuracy of the logo area detection by detecting the logo area on a pixel-by-pixel basis from the 3D depth map information detected from the video signal RGB. In addition, the logo area detecting unit 152 detects the logo area by accumulating the depth map information for a predetermined time period, thereby detecting the logo area accurately even when the type of the image signal RGB, that is, the image signal RGB is a moving image or a still image can do.

The color analysis unit 153 may analyze the peripheral color of the logo area provided from the logo area detection unit 152, that is, the gradation level of the peripheral area, and generate a background color, for example, a background color according to the result (S30).

The background color may be generated from the color of the area closest to the logo area in the image signal, and the color analysis unit 153 may analyze the color histogram of the surrounding area closest to the logo area to generate the background color.

6 is an exemplary view of the operation of the color analysis unit.

4 and 6, first, the logo area detecting unit 152 detects the logo image from the image signal RGB as shown in (a) of FIG. 6 according to the depth map information provided from the depth map extracting unit 151, Can be detected. The detected logo region (LR) may be provided to the color analyzer 153.

The color analyzer 153 can generate the extended logo area LR 'as shown in FIG. 6 (b) by extending the logo area LR provided from the logo area detecting part 152. The color analysis unit 153 may generate the extended logo region LR 'from the logo region LR through a mask expansion method or the like.

For example, when the logo region LR detected from the image signal RGB is composed of a plurality of pixels denoted by 1 and the remaining region other than the logo region LR is composed of a plurality of pixels denoted by 0, The unit 153 may sequentially generate a mask of a predetermined size, e.g., a plurality of pixels, in order to generate an extended logo region LR '. That is, when the pixel of the logo region LR is located in the central region of the mask, the color analyzing unit 153 converts the pixel corresponding to the remaining eight regions of the mask to 1 to generate the extended logo region LR ' can do.

The color analyzer 153 can generate the logo outer area LR '' as shown in FIG. 6 (c) using the logo area LR and the extended logo area LR '. The color analysis unit 153 may generate the logo outer region LR " 'by excluding the logo region LR from the extended logo region LR'.

That is, since the extended log area LR 'is wider than the range of the logo area LR, the color analyzer 153 removes the logo area LR from the extended logo area LR' LR ").

The logo outer area LR '' may be the portion closest to the edge of the logo of the logo area LR. Here, the edge of the logo may be an area forming the boundary between the logo area LR and the outside area, that is, the area other than the logo area LR.

Then, the color analyzer 153 can generate a background color from the color of the logo outer area LR '' by analyzing the color histogram of the logo outer area LR ''. The color analyzer 153 analyzes the gradation levels of the W, R, G, and B subpixels in the color histogram of the logo outer area LR '', and calculates the background color from the gradation levels of the subpixels Can be generated.

4 and 5, the gradation level adjusting unit 154 may adjust the gradation level for the logo of the logo region from the background color provided from the color analyzing unit 153 (S40).

The grayscale level adjuster 154 may lower the brightness by adjusting the logo of the logo area to a grayscale level lower than the grayscale level of the background color. At this time, the grayscale level controller 154 can increase the grayscale level of the white component, that is, the W subpixel of the logo, so that the logo having the lowered grayscale level can have a translucent form. Here, the grayscale level controller 154 may increase the W subpixel of the logo to a grayscale level slightly lower than the 255 grayscale level.

As described above, the gradation level adjuster 154 of the present embodiment lowers the gradation level of the logo included in the logo area by using the background color, and by increasing the gradation level of the W sub-pixel of the logo, You can create a logo. Therefore, by lowering the conventional maximum gradation level and creating a low-brightness logo, it is possible to solve the problem that the color of the logo is distorted.

The image synthesizing unit 155 synthesizes the logo region including the low luminance translucent logo generated by the gradation level adjusting unit 154 with the original image signal RGB to generate the image data RGB '). The image synthesizer 155 may output the image data RGB 'to the data driver 130.

7 is an exemplary view showing the operation of the deterioration compensating unit.

4 and 7, when a video signal RGB including a high-brightness logo is input from the outside, the logo region detecting unit 152 of the deterioration compensating unit 150 extracts, from the depth map information of the video signal RGB, Can be detected.

Here, the logo region L1 may include a logo having a high brightness white component, that is, W, R, G, and B subpixels all having 255 gradation levels, as shown in Fig. 7A.

When the logo area L1 is detected, the color analyzer 153 can generate the background color BC from the peripheral area of the logo area L1.

As described above, the color analyzer 153 generates an extended logo area from the logo area L1, generates a logo outer area using the logo area L1 and the extended logo area, The background color BC can be generated.

Here, as shown in FIG. 7A, the background color BC can have 255 gray levels of high luminance cyan components, that is, G and B subpixels.

The gradation level adjuster 154 may adjust the gradation level for the logo of the logo area L1 according to the background color BC. The gradation level adjuster 154 can adjust the gradation level of the logo to be lower than the gradation level of the background color BC, as shown in Fig. 7 (b). Then, by adjusting the gradation level of the W subpixel of the logo to be higher, it is possible to generate the logo region L3 including the semitransparent logo of low brightness.

The image synthesizing unit 155 may generate the image data RGB 'by synthesizing the logo region L3 including the semitransparent logo of low luminance to the original image signal RGB.

On the other hand, FIG. 7C shows an example of reducing the brightness level of the logo region L2 by the conventional method. That is, conventionally, the gradation levels of W, R, G, and B subpixels are all lowered for a logo having a high-brightness white component included in the logo region L2 to adjust the brightness level. As a result, the logo is converted into an opaque gray color, and color distortion occurs in the logo area L2.

However, as shown in FIG. 7 (b), the present invention reduces the brightness level of the logo of the logo area L3 to the low brightness translucent logo using the background color BC, The color distortion of the logo can be prevented from occurring.

While a number of embodiments have been described in detail above, it should be construed as being illustrative of preferred embodiments rather than limiting the scope of the invention. Therefore, the invention should not be construed as limited to the embodiments described, but should be determined by equivalents to the appended claims and the claims.

100: organic light emitting display device 110: display panel
120: Gate driver 130: Data driver
140: timing controller 150: deterioration compensator
151: depth map extracting unit 152: logo area detecting unit
153: color analyzer 154: gradation level controller
155:

Claims (8)

A depth map extracting unit for extracting depth map information of an input image;
A logo area detecting unit for detecting a logo area including a logo in the input image from the depth map information;
A color analyzer for generating a background color by predicting a color of a peripheral region of the logo region; And
And a gradation level adjuster for adjusting a gradation level of the logo according to the background color to generate a semitransparent logo of low brightness. The method according to claim 1,
Further comprising an image synthesis unit for synthesizing a logo region including the translucent logo of low brightness on the input image to generate image data. The method according to claim 1,
Wherein the logo region detection unit detects, as the logo region, an area including an object having a positive component by using at least one of a vanishing point position, a brightness, and a sharpness from the depth map information. The method according to claim 1,
Wherein the depth map extracting unit extracts the depth map information for each frame of the input image,
Wherein the logo area detecting unit accumulates the depth map information and then detects the logo area from the accumulated information. The method according to claim 1,
Wherein the color analyzer analyzes the color of the logo outer area generated from the logo area to generate the background color. 6. The method of claim 5,
Wherein the color analyzer generates an extended logo area from the logo area and generates the logo outer area from the difference between the extended logo area and the logo area. The method according to claim 1,
Wherein the gradation level adjusting unit adjusts the gradation level of the logo to a level lower than the gradation level of the background color but increases the gradation level of the white subpixel to generate the translucent logo of low brightness. Display panel;
A data driver for outputting a data signal to the display panel; And
And a deterioration compensation unit for generating image data by reducing the brightness level of the logo region in the image signal provided from the outside and outputting the image data to the data driver,
Wherein the deterioration compensator comprises:
A depth map extracting unit for extracting depth map information of an input image;
A logo area detecting unit for detecting a logo area including a logo in the input image from the depth map information;
A color analyzer for generating a background color by predicting a color of a peripheral region of the logo region; And
And a gradation level adjuster for adjusting a gradation level of the logo according to the background color to generate a semitransparent logo of low brightness.

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