CN114765020B - Display device and light leakage compensation method thereof - Google Patents
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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Abstract
A display device and a light leakage compensation method thereof. The driving circuit generates first image data suitable for driving the gray pixel array layer and second image data suitable for driving the color pixel array layer according to the input image data, performs edge detection processing on target gray pixels in the first image data, and compensates gray scale values of the target gray pixels according to the result of the edge detection processing, the tone value of at least one color pixel corresponding to the target gray pixels in the second image data and the gray scale value of a reference pixel adjacent to the target gray pixels.
Description
[ field of technology ]
The present application relates to an electronic device, and more particularly, to a display device and a light leakage compensation method thereof.
[ background Art ]
A Liquid-Crystal Display (LCD) is a flat, thin Display device. A pixel array (pixel array) of a liquid crystal display consists of a number of color or black and white pixels. The liquid crystal does not emit light, so the back of the liquid crystal display needs to be provided with a light source. In order to improve the contrast ratio of the display picture, overlapping color pixel display panels and gray pixel display panels can be configured in the liquid crystal display, so that the gray pixel display panels are configured between the color pixel display panels and the backlight source, and the contrast ratio of the display picture can be effectively improved by performing local dimming through the gray pixel display panels. Although the structure of the LCD can improve the contrast of the display screen, the LCD is easy to leak light (such as light leakage caused by alignment shift between color pixels and gray pixels), especially the edge of the image is easy to generate obvious halation effect, so that the display quality of the LCD is reduced.
[ application ]
The application provides a display device and a light leakage compensation method thereof, which can effectively improve the display quality of the display device.
The display device of the application comprises a color pixel array layer, a gray pixel array layer and a driving circuit. The driving circuit is coupled to the color pixel array layer and the gray pixel array layer, generates first image data suitable for driving the gray pixel array layer and second image data suitable for driving the color pixel array layer according to the input image data, performs edge detection processing on a target gray pixel in the first image data, and compensates the gray scale value of the target gray pixel according to the result of the edge detection processing, the tone value of at least one color pixel corresponding to the target gray pixel in the second image data, and the gray scale value of a reference pixel adjacent to the target gray pixel.
The application also provides a light leakage compensation method of the display equipment, the display equipment comprises a color pixel array layer and a gray pixel array layer, and the color pixel array layer is stacked on the gray pixel array layer. The light leakage compensation method of the display device includes the following steps. First image data suitable for driving the gray pixel array layer and second image data suitable for driving the color pixel array layer are generated according to the input image data. And performing edge detection processing on the target gray pixels in the first image data. And compensating the gray scale value of the target gray pixel according to the result of the edge detection processing, the tone value of at least one color pixel corresponding to the target gray pixel in the second image data and the gray scale value of the reference pixel adjacent to the target gray pixel.
Based on the above, the driving circuit according to the embodiment of the application may perform edge detection processing on the target gray pixel in the first image data, and compensate the gray scale value of the target gray pixel according to the result of the edge detection processing, the tone value of at least one color pixel corresponding to the target gray pixel in the second image data, and the gray scale value of the reference pixel adjacent to the target gray pixel. Therefore, by compensating the gray scale value of the pixels of the image, the halation effect generated by light leakage can be improved, and the display quality of the display device can be improved.
[ description of the drawings ]
Fig. 1 is a schematic view of a display device according to an embodiment of the present application.
Fig. 2 is a schematic view of a display device according to another embodiment of the present application.
FIG. 3 is a schematic diagram of a target gray pixel and neighboring pixels according to an embodiment of the application.
FIG. 4 is a graph showing the relationship between the first weight value and the gray scale difference according to an embodiment of the application.
FIG. 5 is a graph of second weight values versus hue values according to one embodiment of the present application.
FIG. 6 is a schematic diagram showing the effects of gray level compensation according to an embodiment of the present application.
Fig. 7 is a flowchart of a light leakage compensation method of a display device according to an embodiment of the present application.
Fig. 8 is a flowchart illustrating a light leakage compensation method of a display device according to another embodiment of the present application.
[ symbolic description ]
102: gray pixel array layer
104: color pixel array layer
106: driving circuit
108: backlight source
202. 204: computing circuit
206: edge processing circuit
208: gray scale compensation circuit
L1: backlight unit
S1: inputting image data
D1: first image data
D2: second image data
W (x, y): target gray pixel
W (x-1, y-1), W (x, y-1), W (x+1, y-1), W (x-1, y), W (x, y), W (x+1, y), W (x-1, y+1), W (x, y+1), W (x+1, y+1): adjacent pixels
W1: first weight value
W2: second weight value
S702 to S706, S802 to S806: steps of light leakage compensation method for display device
[ detailed description ] of the application
The term "coupled" as used throughout this specification (including the claims) may refer to any direct or indirect connection. For example, if a first device couples (or connects) to a second device, that connection may be through a direct connection, or through an indirect connection via other devices and connections. The terms first, second and the like in the description (including the claims) are used for naming the elements or distinguishing between different embodiments or ranges and are not used for limiting the number of elements or the order of the elements. In addition, wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts. Elements/components/steps in different embodiments that use the same reference numerals or use the same language may be referred to in relation to each other.
Fig. 1 is a schematic view of a display device according to an embodiment of the present application. The display device may be, for example, a liquid crystal display (Liquid Crystal Display, LCD) panel or other non-self-luminous display panel, and includes a gray pixel array layer 102, a color pixel array layer 104, a driving circuit 106, and a backlight 108. Backlight 108 may provide backlight L1 to gray pixel array layer 102 and color pixel array layer 104. The backlight 108 may be a direct-lit backlight, a side-lit backlight, or other backlights, depending on design requirements. In some embodiments, the backlight 108 may not have a dimming (dimming) function. In other embodiments, the backlight 108 may have a local dimming (local dimming) function. In still other embodiments, the backlight 108 may have a global dimming (global dimming) function.
The color pixel array layer 104 is stacked on the gray pixel array layer 102, and the gray pixel array layer 102 can realize a local dimming function and/or a global dimming function. The color pixel array layer 104 may include a color pixel array or other pixel arrays, and the gray pixel array layer 102 may include a gray pixel array or other pixel arrays, depending on design requirements. In some embodiments, the color pixel array layer 104 and the gray pixel array layer 102 may be two LCD pixel arrays or other non-self-luminous pixel arrays according to design requirements. The ratio of the number of the gray pixels in the gray pixel array layer 102 to the number of the color pixels in the color pixel array layer 104 may be, for example, 1:4, i.e., one gray pixel may overlap the corresponding 4 color pixels, but not limited thereto, and in other embodiments, the ratio of the number of the gray pixels to the number of the color pixels may be different.
Backlight L1 provided by backlight 108 may be illuminated to color pixel array layer 104 through gray pixel array layer 102. The driving circuit 106 may control a gray scale (luminous flux) of each pixel of the gray pixel array layer 102. Based on the driving and control of the driving circuit 106, the gray pixel array layer 102 can adjust the amount of light irradiated to the color pixel array layer 104, thereby realizing the local dimming function and/or the global dimming function. Based on the driving and control of the driving circuit 106, the color pixel array layer 104 can display color images.
Furthermore, the driving circuit 106 may receive input image data and generate first image data and second image data according to the input image data S1, wherein the input image data S1 may be, for example, RGB data, the first image data may be, for example, gray pixel data, and the second image data may be, for example, color pixel data, and the driving circuit 106 may drive the gray pixel array layer 102 and the color pixel array layer 104 according to the first image data and the second image data, respectively, so as to display an image. The driving circuit 106 may further perform an edge detection process on the first image data, for example, the edge detection process may be performed on a target gray pixel in the first image data, and the gray scale value of the target gray pixel is compensated according to the result of the edge detection process, the tone value of at least one color pixel corresponding to the target gray pixel in the second image data, and the gray scale value of a reference pixel adjacent to the target gray pixel in the first image data. The driving circuit 106 can perform edge detection and gray level compensation on each gray pixel in the first image data in this way, so as to adjust the gray level of the image, compensate the halation effect generated by light leakage, and thereby improve the display quality of the display device. Because the halation effect is more obvious at the image edge, in some embodiments, gray-scale value compensation can be performed only for gray pixels belonging to the image edge, so as to modify the display effect at the image edge, effectively improve the halation effect generated by light leakage, and improve the display quality of the display device.
Fig. 2 is a schematic view of a display device according to another embodiment of the present application. Further, the driving circuit 106 may include computing circuits 202, 204, an edge processing circuit 206, and a gray scale compensation circuit 208, wherein the computing circuit 204 is coupled to the computing circuit 202 and the color pixel array layer 104, the edge processing circuit 206 is coupled to the computing circuit 202 and the gray scale compensation circuit 208, and the gray scale compensation circuit 208 is coupled to the gray scale pixel array layer 102. The computing circuit 202 may convert the input image data S1 into the first image data D1, wherein the input image data S1 may be, for example, RGB data, the first image data D1 may be, for example, gray pixel data, and the computing circuit 204 may convert the first image data D1 into the second image data D2, and the second image data D2 may be, for example, color pixel data. For example, the calculating circuit 204 may convert the first image data D1 for driving the target gray pixel into the second image data D2 suitable for driving at least one color pixel (e.g. but not limited to 4 color pixels) corresponding to the target gray pixel according to the number ratio of the gray pixels to the color pixels.
The edge processing circuit 206 may perform an edge detection process on the target gray pixel, and the edge detection process may, for example, include determining whether the target gray pixel is an image edge according to gray scale differences between the target gray pixel and a plurality of adjacent pixels of the target gray pixel in the first image data. For example, as shown in FIG. 3, the target gray pixel W (x, y) may have a plurality of neighboring pixels W (x-1, y-1), W (x, y-1), W (x+1, y-1), W (x-1, y), W (x, y), W (x+1, y+1), W (x, y+1) and W (x+1, y+1) around the target gray pixel W (x, y-1), and the edge processing circuit 206 may calculate the difference between the gray level of the target gray pixel W (x, y) and the gray level of each neighboring pixel to obtain a plurality of gray level differences. That is, the edge processing circuit 206 can calculate the following equations 1 to 8 to obtain the gray level differences edul_ W, edU _ W, edUR _ W, edL _ W, edR _ W, edDL _ W, edD _w and eddr_w.
EdUL_W＝|W(x,y)-W(x-1,y-1)| (1)
EdU_W＝|W(x,y)-W(x,y-1)| (2)
EdUR_W＝|W(x,y)-W(x+1,y-1)| (3)
EdL_W＝|W(x,y)-W(x-1,y)| (4)
EdR_W＝|W(x,y)-W(x+1,y)| (5)
EdDL_W＝|W(x,y)-W(x-1,y+1)| (6)
EdD_W＝|W(x,y)-W(x,y+1)| (7)
EdDR_W＝|W(x,y)-W(x+1,y+1)| (8)
The edge processing circuit 206 can determine whether the target gray pixel W (x, y) belongs to the image edge according to the gray level differences shown in the formulas 1 to 8, wherein the pixel with the smallest gray level value among the adjacent pixels W (x-1, y-1), W (x, y-1), W (x+1, y-1), W (x-1, y), W (x, y), W (x+1, y+1), W (x, y+1) and W (x+1, y+1) can be used as the reference pixel. For example, the edge processing circuit 206 may take the maximum one of the gray level differences edul_ W, edU _ W, edUR _ W, edL _ W, edR _ W, edDL _ W, edD _w and eddr_w as the representative difference ed_w (x, y) of the target gray pixel W (x, y), i.e. take the gray level difference between the target gray pixel W (x, y) and the reference pixel as the representative difference ed_w (x, y) of the target gray pixel W (x, y).
The edge processing circuit 206 may compare the representative difference ed_w (x, y) with a gray-scale threshold ed_th to determine whether the target gray pixel W (x, y) belongs to an image edge, wherein the gray-scale threshold ed_th may be any real number determined according to design requirements. For example, when the representative difference ed_w (x, y) is greater than or equal to the gray level threshold ed_th, the edge processing circuit 206 can determine that the target gray pixel W (x, y) belongs to the image edge. Conversely, when the representative difference ed_w (x, y) is smaller than the gray level threshold ed_th, the edge processing circuit 206 can determine that the target gray pixel W (x, y) does not belong to the image edge.
The gray-scale compensation circuit 208 can compensate the gray-scale value of the target gray-scale pixel W (x, y) according to the gray-scale difference value of the target gray-scale pixel W (x, y) and the reference pixel, the tone value of at least one color pixel corresponding to the target gray-scale pixel W (x, y) (e.g., the tone average value of 4 color pixels corresponding to the target gray-scale pixel W (x, y), but not limited thereto), and the gray-scale value of the reference pixel. For example, the gray-scale compensation circuit 208 can compensate the gray-scale value of the target gray pixel W (x, y) in the following equation 9.
W’c＝Wr+ED_W(x,y)*W1*W2 (9)
Wherein W' c is the gray level of the target gray pixel W (x, y) after gray level compensation, wr is the gray level of the reference pixel, W1 is a first weight value associated with the gray level difference between the target gray pixel W (x, y) and the reference pixel, and W2 is a second weight value associated with the tone value of at least one color pixel corresponding to the target gray pixel W (x, y), and the first weight value W1 and the second weight value W2 can be determined, for example, according to the graphs shown in fig. 4 and 5. As shown in fig. 4 and fig. 5, the first weight W1 decreases with increasing gray level difference between the target gray pixel W (x, y) and the reference pixel, and the second weight W2 has a bell-shaped distribution that increases and decreases with increasing tone value, wherein the tone corresponding to the maximum and minimum tone values is red, and the red and blue colors are more sensitive to human eyes than other colors, so they correspond to smaller weight values. Therefore, the gray level difference between the target gray pixel W (x, y) and the reference pixel can be reduced by multiplying the representative difference ed_w (x, y) with the first weight value W1 and the second weight value W2, so as to effectively improve the halation effect caused by light leakage. The left side of fig. 6 is an image frame before gray-scale compensation, and the right side is an image frame after gray-scale compensation, as shown in fig. 6, by the gray-scale compensation process, the halation effect caused by light leakage at the image edge can be effectively compensated, and the display quality of the display device can be greatly improved.
It should be noted that, since the halo effect at the non-image edge is not obvious, in some embodiments, when the edge processing circuit 206 determines that the target gray pixel W (x, y) does not belong to the image edge according to the representative difference ed_w (x, y) and the gray level threshold ed_th, the gray level compensation circuit 208 may also select not to perform gray level compensation on the target gray pixel W (x, y), so that the calculation amount of the gray level compensation circuit 208 may be reduced, and the working efficiency of the driving circuit 106 may be improved.
Fig. 7 is a flowchart of a light leakage compensation method of a display device according to an embodiment of the present application. Referring to fig. 7, the light leakage compensation method of the display device according to the above embodiment may include the following steps. First, first image data suitable for driving the gray pixel array layer and second image data suitable for driving the color pixel array layer are generated according to the input image data (step S702). Next, edge detection processing is performed on the target gray pixel in the first image data (step S704). Finally, the gray scale value of the target gray pixel is compensated according to the result of the edge detection process, the tone value of at least one color pixel corresponding to the target gray pixel in the second image data, and the gray scale value of the reference pixel adjacent to the target gray pixel (step S706), wherein the reference pixel may be, for example, a pixel having the smallest gray scale value among a plurality of adjacent pixels adjacent to the target gray pixel.
Further, as shown in fig. 8, after step S702, a reference pixel is determined according to gray scale differences between the target gray pixel and a plurality of adjacent pixels of the target gray pixel (step S802), for example, the adjacent pixel corresponding to the maximum gray scale difference is used as the reference pixel. Then, according to whether the gray level difference value between the target gray pixel and the reference pixel is greater than or equal to the gray level threshold value, it is determined whether the target gray pixel is an image edge (step S804), for example, when the gray level difference value between the target gray pixel and the reference pixel is greater than or equal to the gray level threshold value, it is determined that the target gray pixel belongs to the image edge, and when the gray level difference value between the target gray pixel and the reference pixel is less than the gray level threshold value, it is determined that the target gray pixel does not belong to the image edge. In some embodiments, when the target gray pixel does not belong to the image edge, the gray value compensation may not be performed on the target gray pixel. When the gray level compensation is performed, the gray level of the target gray pixel can be compensated according to, for example, the gray level difference between the target gray pixel and the reference pixel, the tone value of at least one color pixel corresponding to the target gray pixel, and the gray level value of the reference pixel (step S806). In detail, the gray level value of the target gray pixel can be compensated according to a first weight value and a second weight value, wherein the first weight value is related to the gray level difference value between the target gray pixel and the reference pixel, and the second weight value is related to the tone value of at least one color pixel corresponding to the target gray pixel. The first weight value may decrease as the gray level difference between the target gray pixel and the reference pixel increases, and the compensated gray level value of the target gray pixel may be equal to the product value obtained by adding the gray level value of the reference pixel to the gray level difference between the target gray pixel and the reference pixel multiplied by the first weight value and the second weight value.
In summary, the driving circuit according to the embodiment of the application may perform the edge detection processing on the target gray pixel in the first image data, and compensate the gray level value of the target gray pixel according to the result of the edge detection processing, the tone value of at least one color pixel corresponding to the target gray pixel in the second image data, and the gray level value of the reference pixel adjacent to the target gray pixel. By adjusting the gray scale value of the pixels of the image, the halation effect generated by light leakage can be improved, thereby improving the display quality of the display device. In some embodiments, gray-scale compensation can be performed only for gray pixels belonging to an image edge to modify the display effect at the image edge, so as to effectively improve the halation effect generated by light leakage and improve the display quality of the display device.
Claims (14)
1. A display device, comprising: a color pixel array layer; a gray pixel array layer; and the driving circuit is coupled with the color pixel array layer and the gray pixel array layer, generates first image data suitable for driving the gray pixel array layer and second image data suitable for driving the color pixel array layer according to input image data, performs edge detection processing on target gray pixels in the first image data, and compensates gray scale values of the target gray pixels according to the edge detection processing result, the tone value of at least one color pixel corresponding to the target gray pixels in the second image data and the gray scale value of reference pixels adjacent to the target gray pixels.
2. The display device according to claim 1, wherein the driving circuit comprises: a first calculation circuit for converting the input image data into the first image data; the second computing circuit is coupled with the first computing circuit and generates the second image data according to the first image data so as to drive at least one color pixel corresponding to the target gray pixel; the edge processing circuit is coupled with the first computing circuit and is used for executing the edge detection processing on the target gray pixel, and the edge detection processing comprises judging whether the target gray pixel is an image edge or not according to gray scale difference values between the target gray pixel and a plurality of adjacent pixels of the target gray pixel; and a gray level compensation circuit, coupled to the edge processing circuit, for compensating the gray level value of the target gray pixel according to the gray level difference value of the target gray pixel and the reference pixel, the tone value of at least one color pixel corresponding to the target gray pixel, and the gray level value of the reference pixel.
3. The display apparatus of claim 2, wherein the reference pixel is a pixel having a smallest grayscale value among the plurality of neighboring pixels.
4. The display device of claim 3, wherein the gray scale compensation circuit further compensates the gray scale value of the target gray pixel according to a first weight value and a second weight value, wherein the first weight value is related to the gray scale difference value of the target gray pixel and the reference pixel, and the second weight value is related to the tone value of at least one color pixel corresponding to the target gray pixel.
5. The display apparatus of claim 4, wherein the first weight value decreases as a gray scale difference value of the target gray pixel and the reference pixel increases, the compensated gray scale value of the target gray pixel being equal to a product value of the gray scale value of the reference pixel plus a gray scale difference value of the target gray pixel and the reference pixel multiplied by the first weight value and the second weight value.
6. The display device according to claim 3, wherein the gray-scale compensation circuit determines whether the target gray-scale pixel is an image edge according to whether a gray-scale difference between the target gray-scale pixel and the reference pixel is greater than or equal to a gray-scale threshold.
7. The display device according to claim 1, wherein the driving circuit does not compensate for the target gray pixel when the driving circuit detects that the target gray pixel does not belong to an image edge.
8. A light leakage compensation method of a display device including a color pixel array layer and a gray pixel array layer and a driving circuit, the color pixel array layer being stacked on the gray pixel array layer, the light leakage compensation method of the display device comprising: generating first image data suitable for driving the gray pixel array layer and second image data suitable for driving the color pixel array layer according to the input image data; performing edge detection processing on target gray pixels in the first image data; and compensating the gray scale value of the target gray pixel according to the result of the edge detection process, the tone value of at least one color pixel corresponding to the target gray pixel in the second image data, and the gray scale value of a reference pixel adjacent to the target gray pixel.
9. The light leakage compensation method of the display device according to claim 8, wherein the edge detection process includes determining whether the target gray pixel is an image edge according to gray scale differences between the target gray pixel and a plurality of adjacent pixels of the target gray pixel, the light leakage compensation method of the display device comprising: determining the reference pixel according to gray level differences between the target gray pixel and the plurality of adjacent pixels; and compensating the gray scale value of the target gray pixel according to the gray scale difference value of the target gray pixel and the reference pixel, the tone value of at least one color pixel corresponding to the target gray pixel and the gray scale value of the reference pixel.
10. The light leakage compensation method of a display apparatus according to claim 9, wherein the reference pixel is a pixel having a smallest gray scale value among the plurality of adjacent pixels.
11. The light leakage compensation method of a display device according to claim 10, comprising: compensating the gray level value of the target gray pixel according to a first weight value and a second weight value, wherein the first weight value is related to the gray level difference value between the target gray pixel and the reference pixel, and the second weight value is related to the tone value of at least one color pixel corresponding to the target gray pixel.
12. The light leakage compensation method of claim 11, wherein the first weight value decreases as a gray scale difference value between the target gray pixel and the reference pixel increases, the compensated gray scale value of the target gray pixel being equal to a product value obtained by adding the gray scale value of the reference pixel to the gray scale difference value between the target gray pixel and the reference pixel multiplied by the first weight value and the second weight value.
13. The light leakage compensation method of a display device according to claim 10, comprising: judging whether the target gray pixel is an image edge according to whether the gray level difference value of the target gray pixel and the reference pixel is larger than or equal to a gray level threshold value.
14. The light leakage compensation method of the display device according to claim 8, comprising: when the driving circuit detects that the target gray pixel does not belong to the image edge, the target gray pixel is not compensated.
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