TW202137603A - Panel boundary processing method - Google Patents

Abstract

A panel boundary processing method applied to a display panel is disclosed. The display panel includes a first display area and a second display area and there is a boundary between the first display area and the second display area. The method includes steps of: (a) analyzing a display state of the display panel; (b) introducing a visual model; (c) using a visual simulation algorithm to generate a visual simulation diagram; (d) using the visual simulation diagram to find out the position to be compensated on the display panel and the compensating brightness; and (e) calculating the compensating brightness to generate a compensating value.

Description

Panel boundary processing method

The present invention relates to a display panel, and particularly relates to a method for processing the panel boundary.

With the rapid evolution of display technology, the industry has developed a variety of under-screen camera display technologies, one of which is to increase the light transmittance by removing pixels.

However, from the perspective of the existing panel architecture, if the pixel is removed, the resolution of the local area is likely to be different. From a visual point of view, it is easy to produce at the boundary between the main screen and the secondary screen (for example, the transparent area) Bright and dark lines or bright and dark dots.

For example, as shown in FIG. 1, bright and dark lines will be generated at the straight line boundary BD1 between the main screen DA1 and the secondary screen (such as the transparent area) DA2, and an arc between the primary screen DA1 and the secondary screen (such as the transparent area) DA2 will be generated. Bright and dark spots will be generated at the shape boundary BD2, which will cause visual discontinuity, which will seriously affect the display quality of the display panel, which needs to be improved urgently.

In view of this, the present invention proposes a panel boundary processing method to effectively solve the above-mentioned problems encountered in the prior art.

A specific embodiment according to the present invention is a panel boundary processing method. In this embodiment, the panel boundary processing method is applied to the display panel. The display panel includes a first display area and a second display area, and there is a boundary between the first display area and the second display area. The method includes the following steps: (a) Analyze the display status of the display panel; (b) Import a visual model; (c) Use a visual simulation algorithm to generate a visual simulation diagram; (d) Use the visual simulation diagram to find out the need for compensation on the display panel Position and compensation brightness; and (e) calculating the compensation brightness to generate a compensation value.

In one embodiment, the display panel is an under-screen camera display panel.

In one embodiment, the display panel is an organic light emitting diode (OLED) display panel.

In one embodiment, the first display area and the second display area have different resolutions.

In one embodiment, the boundary includes a straight part and/or an arc part.

In one embodiment, in the visual model, the pixels of the display panel are the object plane with discrete signals. When the object plane is transmitted to the image plane, the point light source will diffuse into a light spot, which is called an impulse response or convolution kernel. (Kernel), the visually received signal is obtained by convolution of the object plane and the impulse response (or convolution kernel).

In one embodiment, step (c) is to perform convolution on the High resolution grid and the Kernel and then perform image processing to generate a low resolution grid. (Low resolution grid) as a visual simulation map.

In one embodiment, the high-resolution grid pattern is obtained based on at least one pixel information.

In one embodiment, the at least one pixel information includes the rendering, area, brightness, and/or distance of the pixel.

In one embodiment, the panel boundary processing method further includes the following steps: (f) after storing the single-point compensation value obtained in step (e), the output gray scale value is restored by calculation to achieve full gray scale compensation.

In one embodiment, under different input gray scale values, the corresponding relationship of the output gray scale values is calculated.

In one embodiment, the panel boundary processing method is executed by a processing circuit, and the processing circuit is disposed between a sub-pixel rendering (SPR) circuit and a gamma (Gamma) circuit.

In an embodiment, the processing circuit includes a brightness unevenness removing unit, a multi-area compensation unit, and a synthesis unit. When the processing circuit receives the signal from the sub-pixel rendering circuit, the uneven brightness removing unit and the multi-area compensation unit respectively perform uneven brightness removing and multi-area compensation on the signal, and then are synthesized by the synthesis unit and output to the gamma circuit.

In one embodiment, the uneven brightness removing unit and the multi-region compensation unit are respectively coupled to the memory and obtain the uneven brightness removing data and the multi-region compensation data from the memory, respectively.

In one embodiment, the multi-area compensation unit performs brightness compensation in the first display area and/or the second display area near the boundary to eliminate bright lines and/or bright spots located at the boundary.

In one embodiment, the multi-area compensation unit forms a brightness gradient transition area in the first display area and/or the second display area near the boundary to eliminate the graininess at the boundary.

Compared with the prior art, the panel boundary processing method proposed by the present invention can optimize the brightness distribution of the display panel through a multi-area compensation method, thereby effectively eliminating the visual discontinuity between display areas of different resolutions (especially Bright and dark lines, bright and dark dots), so the display quality of the display panel can be greatly improved.

The advantages and spirit of the present invention can be further understood from the following detailed description of the invention and the accompanying drawings.

Reference will now be made in detail to the exemplary embodiments of the present invention, and examples of the exemplary embodiments are illustrated in the accompanying drawings. Elements/components with the same or similar numbers used in the drawings and embodiments are used to represent the same or similar parts.

A specific embodiment according to the present invention is a panel boundary processing method. In this embodiment, the panel boundary processing method is applied to a display panel, such as an organic light emitting diode (OLED) display panel provided with an under-screen camera, but it is not limited to this.

The display panel in this embodiment at least includes a first display area and a second display area, and there is a boundary between the first display area and the second display area. The first display area and the second display area may have different resolutions (PPI), such as a high-resolution main screen and a low-resolution secondary screen (such as a transparent area), but not limited to this. The boundary between the first display area and the second display area may include a straight portion and/or an arc portion, but is not limited to this.

Please refer to FIG. 2. FIG. 2 shows a flowchart of the panel boundary processing method in this embodiment. As shown in Figure 2, the panel boundary processing method in this embodiment may include the following steps:

Step S10: Analyze the display state of the display panel;

Step S12: Import the visual model;

Step S14: Use a visual simulation algorithm to generate a visual simulation diagram;

Step S16: Use the visual simulation diagram to find out the position to be compensated on the display panel and compensate the brightness; and

Step S18: Calculate the compensation brightness to generate a compensation value.

In fact, step S10 is to analyze the display state of the display panel to obtain the brightness distribution of all pixels in the first display area and the second display area, but it is not limited to this. In the visual model imported in step S12, the pixels of the display panel will be regarded as the object plane with discrete signals. When the object plane is transferred to the image plane, the point light source will diffuse into a light spot, which is called It is the impulse response (Impulse response) or the convolution kernel (Kernel), the signal received by the human vision is obtained by convolution of the object plane and the impulse response (or convolution kernel), but not based on this Is limited.

Next, the use of a visual simulation algorithm to generate a visual simulation diagram for step S14 in FIG. 2 will be described in detail.

Please refer to FIG. 3. FIG. 3 is a flowchart of the detailed steps in step S14 of FIG. 2 for generating a visual simulation image using a visual simulation algorithm.

As shown in FIG. 3, steps S20 to S22 obtain pixel information such as rendering, area, brightness, and/or distance of the pixels of the display panel, respectively. Step S23 is to obtain a high resolution grid based on the above-mentioned pixel information. Step S24 is to obtain a convolution kernel (or impulse response) according to the visual model. Step S25 is to perform convolution processing on the high-resolution grid pattern and the convolution kernel (or impulse response), and then perform image processing in step S26, and step S27 generates a low-resolution grid pattern. As a visual simulation diagram.

Through the above steps S20 to S27, the panel boundary processing method of the present invention can generate a visual simulation map to simulate the actual brightness distribution map of the display panel. Then, the panel boundary processing method of the present invention can use the visual simulation map to find out the position to be compensated and the compensation brightness on the display panel (step S16), and calculate the compensation brightness to generate the compensation value (step S18).

In one embodiment, as shown in FIG. 4A, the visual simulation diagram may show the pixel brightness distribution of the first display area (such as the main screen) DA1 and the second display area (such as the secondary screen) DA2 of the display panel, where the numbers 1 and 2.8 are relative brightness. According to FIG. 4A, it can be seen that the relative brightness of pixels near the boundary BD of the first display area DA1 (for example, the main screen) DA1 is 2.8, which is significantly higher than the relative brightness 1 of other pixels, so it can be determined that compensation should be performed.

Next, the relative brightness can be converted into gray scales, as shown in FIG. 4B, in the same position map, converted into gray scales, and a compensation relationship is generated.

It should be noted that, as shown in FIG. 4C, under different input gray scale values, the corresponding relationship of the output gray scale values can be calculated to be a linear relationship, but it is not limited to this. In other words, the output gray scale value and the input gray scale value of the display panel may show a linear relationship as shown in FIG. 4C, or may have other corresponding relationships, and there is no specific limitation. Therefore, the panel boundary processing method of the present invention can store the single-point compensation value obtained in the foregoing steps, and then restore the output grayscale value through calculation to achieve the effect of full grayscale compensation.

Next, please refer to FIG. 5A and FIG. 5B. FIG. 5A is a schematic diagram showing the change of the gray scale value after multi-area compensation is performed on the edge area of the source dimming. FIG. 5B illustrates the corresponding relationship between the output gray scale value and the compensation value and the input gray scale value.

In one embodiment, as shown in FIG. 5A, as far as the normal area of the display panel is concerned, the grayscale value of the pixel will be changed from 255 to 128 after the source dimming SD, and then the multi-area compensation MRC is performed. After that, it remained unchanged at 128. In contrast, as far as the edge area of the display panel is concerned, the grayscale value of the pixel will change from 255 to 128 after the source dimming SD, and then after the multi-area compensation MRC will change from 128 to 128 80.

In other words, the source dimming SD in this embodiment dims the normal area and the edge area at the same time, while the multi-area compensation MRC in this embodiment only compensates the edge area that needs to be compensated, and does not The normal area to be compensated is compensated to eliminate the visual discontinuity caused by the edge area.

As shown in FIG. 5B, the output grayscale value is expressed as a positive value and has a linear relationship with the input grayscale value; the compensation value is expressed as a negative value and has a linear relationship with the input grayscale value. For example, if the input grayscale value is 128 and its corresponding compensation value is -48, the output grayscale value should be 128+(-48)=80; if the input grayscale value is 255 and its corresponding compensation value If it is -95, the output grayscale value should be 255+(-95)=160, and the rest can be deduced by analogy.

Please refer to FIG. 6. FIG. 6 is a functional block diagram of a processing circuit that executes the panel boundary processing method. As shown in FIG. 6, the processing circuit 7 for executing the panel boundary processing method is respectively coupled to the sub-pixel rendering circuit SPR, the gamma circuit GC, and the memory SR. The processing circuit 7 includes a demura unit 70, a multi-area compensation unit 72, a gain table 74, a gain table 76, and a synthesis unit 79.

The uneven brightness removing unit 70 and the gain table 74 are connected in series between the sub-pixel rendering circuit SPR and the synthesis unit 79. The multi-region compensation unit 72 and the gain table 76 are connected in series between the sub-pixel rendering circuit SPR and the synthesis unit 79. The synthesis unit 79 is coupled to a gamma circuit GC. The memory SR is respectively coupled to the uneven brightness removing unit 70 and the multi-region compensation unit 72.

When the processing circuit 7 receives the signal from the sub-pixel rendering circuit SPR, the brightness unevenness removing unit 70 will perform the brightness unevenness removing process on the received signal, and then send it to the synthesizing unit 79 through the gain table 74. The multi-area compensation unit 72 performs multi-area compensation on the received signal and transmits it to the synthesis unit 79 after passing through the gain table 76. The synthesizing unit 79 synthesizes the signal that has undergone the uneven brightness removal process and the signal that has been multi-area compensation, and then outputs the synthesized signal to the gamma circuit GC.

It should be noted that the uneven brightness removing unit 70 and the multi-region compensation unit 72 obtain the uneven brightness removing data and the multi-region compensation data from the memory SR, and the memory SR may be a static random access memory (Static Random Access Memory). Access Memory, SRAM), but not limited to this.

In addition, although FIG. 6 uses the processing circuit 7 for executing the panel boundary processing method to be provided between the sub-pixel rendering circuit SPR and the gamma circuit GC as an example, the processing circuit 7 and the sub-pixel rendering circuit SPR are actually The relative configuration relationship with the gamma circuit GC can also be adjusted according to requirements. For example, the processing circuit 7 can also be arranged after the sub-pixel rendering circuit SPR and the gamma circuit GC, and there is no specific limitation.

Next, different embodiments will be used to illustrate the brightness distribution changes of the display panel after multi-area compensation and the effects achieved.

In one embodiment, as shown in FIG. 7A, it is assumed that the original brightness distribution of the display panel is that the relative brightness of all pixels in the second display area (secondary screen) DA2 is 4 and the relative brightness of all pixels in the first display area (main screen) DA1 is The relative brightness of all pixels is 1, so that a bright line will be generated at the boundary BD between the first display area (main screen) DA1 and the second display area (secondary screen) DA2, causing a sense of visual discontinuity.

After multi-area compensation is performed by the panel boundary processing method of the present invention, as shown in FIG. (Main screen) The relative brightness of the remaining pixels in DA1 remains unchanged at 1, and the relative brightness of all pixels in the second display area (secondary screen) DA2 remains unchanged at 4, which can effectively eliminate the original appearance at the boundary BD. The bright lines to reduce the visual discontinuity and improve the display quality of the display panel.

In another embodiment, as shown in FIG. 8A, it is assumed that the original brightness distribution of the display panel is that the relative brightness of all pixels in the second display area (secondary screen) DA2 is 4 and the relative brightness of all pixels in the first display area (main screen) DA1 is The relative brightness of all the pixels of is equal to 1, so that the boundary BD between the first display area (main screen) DA1 and the second display area (secondary screen) DA2 will have a grainy feeling, resulting in a sense of visual discontinuity.

After the multi-area compensation is performed by the panel boundary processing method of the present invention, as shown in FIG. 8B, a brightness gradient transition area GT is formed near the boundary BD in the first display area (main screen) DA1. The relative brightness of some pixels in the transition zone GT will change from 1 to 0.4~0.6, and the relative brightness of another part of the pixels in the transition zone GT will change from 1 to 1. 1.5.

In other words, when the panel boundary processing method of the present invention performs multi-zone compensation, the relative brightness of a part of the pixels in the brightness gradient transition area GT is increased and the relative brightness of another part of the pixels in the brightness gradient transition area GT is decreased. The relative brightness of the remaining pixels in the first display area (main screen) DA1 remains unchanged at 1, and the relative brightness of all pixels in the second display area (secondary screen) DA2 remains unchanged at 4. By forming the brightness gradient transition area GT adjacent to the boundary BD, the graininess originally generated at the boundary BD can be effectively eliminated, so as to reduce the visual discontinuity and improve the display quality of the display panel.

Compared with the prior art, the panel boundary processing method proposed by the present invention can optimize the brightness distribution of the display panel through a multi-area compensation method, thereby effectively eliminating the visual discontinuity between display areas of different resolutions (especially Bright and dark lines, bright and dark dots), so the display quality of the display panel can be greatly improved.

BD1: Straight line boundary BD2: Curved border DA1: the first display area (main screen) DA2: second display area (secondary screen) S10~S18: steps S20~S27: steps BD: Border 32, 64, 80, 96, 128, 160, 192, 224, 255: grayscale value SD: Source dimming MRC: Multi-zone compensation -48, -95: compensation value GI: Gamma interpolation B1~B4: y value 7: Processing circuit 70: Remove the uneven brightness unit 72: Multi-zone compensation unit 74: Gain table 76: Gain table 79: Synthesis unit SPR: Sub-pixel rendering circuit SR: Memory GC: Gamma circuit 0, 0.4, 0.5, 0.6, 1, 1.5, 2.8, 4: relative brightness GT: Brightness gradient transition zone

The drawings of the present invention are described as follows: FIG. 1 is a schematic diagram showing that the prior art easily produces bright and dark lines or bright and dark dots at the boundary between the main screen and the secondary screen (transparent area). FIG. 2 shows a flowchart of a method for processing panel borders according to a preferred embodiment of the present invention. FIG. 3 is a flowchart showing the detailed steps of step S14 in FIG. 2. 4A shows a schematic diagram of the relative brightness distribution at the boundary between the main screen and the sub screen (transparent area). FIG. 4B shows a schematic diagram of the gray scale value distribution at the boundary between the main screen and the sub screen (transparent area). FIG. 4C illustrates the corresponding relationship between the output gray scale value and the input gray scale value. FIG. 5A is a schematic diagram showing the change of the gray scale value after multi-area compensation is performed on the edge area of the source dimming. FIG. 5B illustrates the corresponding relationship between the output gray scale value and the compensation value and the input gray scale value. FIG. 6 is a functional block diagram of a processing circuit that executes the panel boundary processing method. 7A and 7B respectively show the original brightness distribution of the display panel and the brightness distribution after multi-region compensation to eliminate bright lines on the boundary. 8A and 8B are schematic diagrams of the original brightness distribution of the display panel and the brightness distribution after multi-area compensation to eliminate graininess on the boundary, respectively.

S10~S18: steps

Claims (16)

A panel boundary processing method applied to a display panel. The display panel includes a first display area and a second display area, and there is a boundary between the first display area and the second display area. The panel boundary processing method It includes the following steps: (a) Analyze the display status of the display panel; (b) Import a visual model; (c) Generate a visual simulation map according to a visual simulation algorithm; (d) Use the visual simulation diagram to find out the position to be compensated on the display panel and compensate the brightness; and (e) Calculate the compensated brightness to generate a compensated value. The panel boundary processing method according to claim 1, wherein the display panel is an under-screen camera display panel. The panel boundary processing method according to claim 1, wherein the display panel is an organic light emitting diode (OLED) display panel. The panel boundary processing method according to claim 1, wherein the first display area and the second display area have different resolutions. The panel boundary processing method according to claim 1, wherein the boundary includes a straight part and/or an arc part. The panel boundary processing method according to claim 1, wherein in the visual model, the pixels of the display panel are object planes with discrete signals. When the object plane is transmitted to the image plane, the point light source will diffuse into light spots, called Impulse response (Impulse response) or convolution kernel (Kernel), the visually received signal is obtained by convolution of the object plane and the impulse response (or convolution kernel). The panel boundary processing method as described in claim 1, wherein step (c) is to perform image processing after convolution on the High resolution grid and the Kernel, so as to A low resolution grid is generated as the visual simulation image. The panel boundary processing method according to claim 7, wherein the high-resolution grid pattern is obtained based on at least one pixel information. The panel boundary processing method according to claim 8, wherein the at least one pixel information system includes the rendering, area, brightness, and/or distance of the pixel. The panel boundary processing method as described in claim 1, further including the following steps: (f) After storing the single point compensation value obtained in step (e), the output gray scale value is restored through calculation to achieve full gray scale compensation. The panel boundary processing method according to claim 10, wherein the corresponding relationship of the output gray scale value is calculated under different input gray scale values. The panel boundary processing method according to claim 1, wherein the panel boundary processing method is executed by a processing circuit disposed between a sub-pixel rendering (SPR) circuit and a gamma circuit. The panel boundary processing method of claim 12, wherein the processing circuit includes a brightness unevenness removing unit, a multi-area compensation unit, and a synthesis unit, and when the processing circuit receives a signal from the sub-pixel rendering circuit, The unevenness removing unit and the multi-area compensation unit respectively perform unevenness removal processing and multi-area compensation on the signal, and are synthesized by the synthesis unit and output to the gamma circuit. The panel boundary processing method according to claim 13, wherein the uneven brightness removing unit and the multi-region compensation unit are respectively coupled to a memory and obtain a uneven brightness removing data and a multi-region compensation data from the memory respectively . The panel boundary processing method according to claim 13, wherein the multi-area compensation unit performs brightness compensation on the first display area and/or the second display area near the boundary to eliminate bright lines located at the boundary And/or highlights. The panel boundary processing method according to claim 13, wherein the multi-area compensation unit forms a brightness gradient transition area in the first display area and/or the second display area near the boundary, so as to eliminate the transition area located at the boundary. The graininess.

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