CN107749284B - Compensation data acquisition method of curved panel and liquid crystal display - Google Patents
Compensation data acquisition method of curved panel and liquid crystal display Download PDFInfo
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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
- G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
Abstract
The invention discloses a method for acquiring compensation data of a curved panel and a liquid crystal display. The method for acquiring the compensation data of the curved panel comprises the following steps: acquiring the position of a compensation point of the curved panel and Mura compensation data, wherein the compensation point is the projection of a pixel of the curved panel in a plane image; performing linear interpolation according to the parameters of the curved surface panel and the positions of the compensation points to obtain the positions of interpolation points, wherein the interpolation points are pixels of the curved surface panel; and calculating the compensation data of the interpolation point according to the Mura compensation data and the position of the interpolation point. By the mode, the product quality of the curved panel can be improved; the position of the interpolation point is obtained by adopting a linear interpolation mode, so that the calculated amount can be effectively reduced.
Description
Technical Field
The invention relates to the technical field of display, in particular to a method for acquiring compensation data of a curved panel and a liquid crystal display.
Background
With the development of Liquid Crystal Displays (LCDs) toward lighter, thinner and larger, due to some uncontrollable factors in the actual process, the physical characteristics of the LCD Display panel are different, resulting in a phenomenon of uneven brightness when displaying a pure gray image in a range larger than one pixel point, which is referred to in the industry as Mura.
The Mura phenomenon has become a bottleneck restricting the development of LCDs. The occurrence probability of the Mura phenomenon can be reduced by methods of improving the process level or improving the purity of raw materials and the like. For the LCD display panel which is manufactured, the physical characteristics are already shaped, and in order to make up for the Mura phenomenon generated by the flaws in the LCD manufacturing process, the brightness of the pixel points can be corrected in a gray compensation mode, so that the Mura phenomenon is improved.
Gray compensation is the improvement of brightness uniformity achieved by changing the gray values of the pixels: that is, the Mura condition of the gray scale image is shot by a camera, a lower gray scale value is applied to the pixel with higher display brightness, and a higher gray scale value is applied to the pixel with lower display brightness, so that the brightness of each pixel after gray scale compensation is close to be consistent, and the Mura phenomenon is improved.
At present, curved liquid crystal televisions are more popular, but after a panel (panel) is bent from a planar state to a curved state, liquid crystal in the panel (panel) is extruded by glass bending stress to generate other unpredictable Mura (the panel is not in the planar state, but is newly added after being bent), so that Mura repair cannot be performed in the planar state of the panel (panel), then the panel is bent to the curved surface, and the only method can only perform Mura compensation repair in the curved panel state; the Mura compensation and restoration method in the industry is based on the fact that the panel is in a planar state, because the display area of the panel shot by a camera in the planar state is different from that of the panel shot in the curved state, and the projection plane length in the curved state is smaller than that in the planar state, the Mura compensation value of each region position of the panel in the curved state cannot be calculated by directly using the existing plane Mura compensation and restoration method, and a Mura phenomenon compensation method suitable for the curved panel must be developed.
Disclosure of Invention
The invention mainly solves the technical problem of providing a method for acquiring compensation data of a curved panel and a liquid crystal display, which can improve the product quality of the curved panel.
In order to solve the technical problems, the invention adopts a technical scheme that: provided is a method for acquiring compensation data of a curved panel, comprising the following steps: acquiring the position of a compensation point of the curved panel and Mura compensation data, wherein the compensation point is the projection of a pixel of the curved panel in a plane image; performing linear interpolation according to the parameters of the curved surface panel and the positions of the compensation points to obtain the positions of interpolation points, wherein the interpolation points are pixels of the curved surface panel; and calculating the compensation data of the interpolation point according to the Mura compensation data and the position of the interpolation point.
In order to solve the technical problem, the invention adopts another technical scheme that: a liquid crystal display is provided, which comprises a curved panel and a controller, wherein the controller is used for carrying out Mura phenomenon compensation on the curved panel by using the position of the interpolation point and the compensation data acquired according to the method.
The invention has the beneficial effects that: different from the situation of the prior art, the method obtains the position of the compensation point of the curved panel and Mura compensation data, wherein the compensation point is the projection of the pixel of the curved panel in the plane image; performing linear interpolation according to the parameters of the curved surface panel and the positions of the compensation points to obtain the positions of interpolation points, wherein the interpolation points are pixels of the curved surface panel; the compensation data of the interpolation points are calculated according to the Mura compensation data and the positions of the interpolation points, and then Mura compensation is carried out on the curved surface panel according to the positions of the interpolation points and the compensation data, so that Mura compensation is carried out on the curved surface liquid crystal panel in a curved surface state, and the product quality of the curved surface liquid crystal panel is improved; the position of the interpolation point is obtained by adopting a linear interpolation mode, so that the calculated amount can be effectively reduced.
Drawings
FIG. 1 is a schematic flow chart diagram illustrating an embodiment of a method for obtaining compensation data of a curved panel according to the present invention;
FIG. 2 is a schematic diagram illustrating the calculation of one specific interpolation point in step S103 of FIG. 1;
FIG. 3 is a schematic structural diagram of an embodiment of a liquid crystal display according to the invention.
Detailed Description
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating an embodiment of a method for obtaining compensation data of a curved panel. It should be noted that the method of the present invention is not limited to the flow sequence shown in fig. 1 if the results are substantially the same. As shown in fig. 1, the method comprises the steps of:
s101: and acquiring the position of a compensation point of the curved panel and Mura compensation data, wherein the compensation point is the projection of the pixel of the curved panel in the plane image.
Wherein, Mura refers to the phenomenon that the brightness of the display is not uniform, which causes various marks. The simplest method of determination is to switch to black, and other low gray level pictures in a dark room. Then, when viewing from various angles, the LCD has various Mura along with various process defects. For example: may be a transverse stripe or a forty-five degree angular stripe, may be a square cut straight, may be a corner, or may be the mark of a completely irregular, east-west piece of a flower. Therefore, the Mura phenomenon of the display needs to be compensated.
In one specific embodiment, the curved panel may be photographed by using a camera to obtain a planar image of the curved panel, and then the position of the compensation point and the Mura compensation data may be obtained according to the planar image. Specifically, the curved panel may be photographed by a camera, and in addition, the curved panel may be photographed by a mobile terminal (e.g., a smartphone) having a photographing function.
Theoretically, it is only necessary to take a picture in front of the curved panel by the camera and obtain a planar image of the curved panel. However, in order to conveniently interpolate the position of the compensation point according to the parameters of the curved panel and the obtained position of the curved panel in the subsequent step, the central axis of the curved panel of the camera device may be set for shooting, specifically, the camera device may shoot on the central axis at a certain distance from the curved panel, and the central axis refers to a line where the center of the circle of the curved panel is located.
In addition, because the shooting process of the curved surface panel by the camera device has a lot of uncertainties, the positions of the compensation points of the curved surface panel and the Mura compensation data can be obtained at least three times, the gray scale of the display picture of the curved surface panel obtained each time is different, and therefore the accuracy of the finally obtained compensation data is improved. Specifically, the gray scale of the display screen of the curved panel may be selected from a gray scale interval including 0 gray scale and the maximum gray scale. The maximum grayscale is 255.
S102: and performing linear interpolation according to the parameters of the curved surface panel and the positions of the compensation points to obtain the positions of interpolation points, wherein the interpolation points are pixels of the curved surface panel.
Because the curved panel is a curved surface only in the horizontal direction and is a plane in the vertical direction, linear interpolation can be performed only in the horizontal direction according to the parameters of the curved panel and the positions of the compensation points, and the positions of the interpolation points are obtained.
Specifically, the position of the interpolation point is calculated using the following formula:
x＝n*L*cos(μ1)+k(n*(n-1)/2)，
wherein, x is the minimum value of the horizontal distance between the interpolation point and the vertical edge of the plane image, and n is the minimum value of the difference value between the serial number of the curved surface panel pixel corresponding to the interpolation point in the horizontal line of the curved surface panel and the serial number of the edge pixel in the same line. L is a straight-line distance between adjacent pixels on the curved panel, L is 2 × sin (α/2) × R, α is 180 × c/(pi × R), R is a radius of the curved panel, c is a curved-surface distance between adjacent pixels on the curved panel, μ 1 ═ arccos (L/(2 × R)) -arccos (d/R), d is a half-chord length of the curved panel, and 2d is a length of the planar image of the curved panel in the horizontal direction. k is the difference between the pitches of two consecutive pairs of adjacent pixels on the projection plane, (L-L × cos (μ 1))/(M/2), and M is the number of pixels in the horizontal direction of the curved panel. N is the minimum value of the absolute value of the difference between the serial number of the curved panel pixel corresponding to the interpolation point in the horizontal line on the curved panel and the serial number of the edge pixel in the same line. Taking the center of the curved panel as a boundary, if the pixels of the curved panel are positioned on the left half face, x is the horizontal distance between the corresponding interpolation point and the left edge of the plane image, and n is the difference value between the serial number of the pixels of the curved panel in the horizontal line and the serial number of the pixels on the left edge; if the pixels of the curved panel are located on the right half, x is the horizontal distance between the corresponding interpolation point and the right edge of the plane image, and n is the difference value between the serial number of the pixels of the curved panel in the horizontal line and the serial number of the pixels of the right edge.
Specifically, referring to fig. 2, fig. 2 is a schematic diagram illustrating the calculation of one specific interpolation point in step S103 in fig. 1 according to the present invention. As shown in fig. 2, fig. 2 includes a camera 21 and a curved panel 23. The camera 21 is disposed on the central axis of the curved panel 23, and the distance from the curved panel 23 is R, and the position of the camera 21 is assumed to be point O. The plane image 22 is a plane image captured by the camera 21, the pixel point 221 on the plane image 22 is a compensation point captured by the camera 21, a projection of the pixel point D on the curved panel 23 on the plane image 22 is a point P, and the point P is an interpolation point corresponding to the pixel point D. Pixel point a and pixel point F on the curved panel 23 coincide with points H and Z on the planar image 22, respectively.
Taking the left half plane as an example, the pixel B is the closest pixel from the left edge of the curved panel, the linear distance between the pixel a on the curved panel 23 and the pixel B is L, and L is 2 × sin (α/2) × R, where α is 180 × c/(pi × R) according to the fan-shaped central angle formula, the unit of α is degree, c is the curved distance between adjacent pixels on the curved panel, and c is the intrinsic parameter of the curved panel, which is known. μ 1 ═ OAB ═ OAK, where cos ═ OAB ═ L/(2 × R) and cos ═ OAK ═ d/R, and thus μ 1 ═ arccos ═ OAB-arccos ═ OAK ═ arccos (L/(2 × R)) -arccos (d/R). Therefore, the projection P1 of the pixel B on the plane image 22 is spaced from the pixel a by AP1 ═ L × cos (μ 1). In addition, as the position of the pixel point 231 on the curved surface panel 23 changes, the distance L × (μ N) between the projections of the adjacent pixel points on the curved surface panel 23 on the plane image 22 is approximately equal to L because ≈ μ N ≈ 0 degrees. In addition, since the mapping of the position of the pixel point 231 on the curved panel 23 in the horizontal direction is approximately proportional to μ, the distance between the n-th pixel point and the projection of the n + 1-th pixel point on the curved panel 23 on the plane image 22 can be approximately: l × cos (μ 1) + k × n; where k is (L-L × cos (μ 1))/(M/2), and k is the difference between the pitches of two consecutive pairs of adjacent interpolated points on the planar image 22, e.g., P1P2-AP1 ═ k. The projection P of the point 231 on the flat image 22 on the curved panel 23 is thus at a distance x (n × L × cos (μ 1) + k (1+2+ … + n-1) ═ n × L × cos (μ 1) + k (n-1)/2) from a.
In addition, the above example calculates the position of the interpolation point projected on the plane image 22 by the pixel point of the left semi-curved surface in fig. 2, and since the right semi-curved surface and the left semi-curved surface in fig. 2 are symmetrical in pixel, the position of the interpolation point projected on the plane image 22 by the pixel point of the right semi-curved surface can be obtained according to the above method.
S103: and calculating the compensation data of the interpolation point according to the Mura compensation data and the position of the interpolation point.
After the projection position of the interpolation point on the plane image is obtained through calculation, it is further determined whether the projection position of the interpolation point on the plane image coincides with the position of the compensation point. When the interpolation point has a compensation point superposed with the interpolation point, the Mura compensation data of the superposed compensation point is used as the compensation data of the interpolation point, and when the interpolation point has no compensation point superposed with the interpolation point, the weighted sum of the Mura compensation data of two compensation points adjacent to the interpolation point is used as the compensation data of the interpolation point.
Specifically, the weighted sum is calculated using the following formula:
y＝(P*d1+Q*d2)/(2d/X)，
wherein y is a weighted sum, P and Q are Mura compensation data of a second compensation point and a first compensation point adjacent to the interpolation point, respectively, d1 is a horizontal distance between the first compensation point and the interpolation point, d2 is a horizontal distance between the second compensation point and the interpolation point, d1 ═ X- (2d/X) × m1|, d2 ═ X- (2d/X) × m2|, m1 and m2 are minimum values of differences between the sequence numbers of the first compensation point and the second compensation point in the horizontal line and the sequence number of the edge pixel in the same line, respectively, and X is the number of pixels in the horizontal direction of the plane image.
In the embodiment, by acquiring the position of the compensation point of the curved panel and the Mura compensation data, the compensation point is the projection of the pixel of the curved panel in the plane image; performing linear interpolation according to the parameters of the curved surface panel and the positions of the compensation points to obtain the positions of interpolation points, wherein the interpolation points are pixels of the curved surface panel; the compensation data of the interpolation points are calculated according to the Mura compensation data and the positions of the interpolation points, and then Mura compensation is carried out on the curved surface panel according to the positions of the interpolation points and the compensation data, so that Mura compensation is carried out on the curved surface liquid crystal panel in a curved surface state, and the product quality of the curved surface liquid crystal panel is improved; the position of the interpolation point is obtained by adopting a linear interpolation mode, so that the calculated amount can be effectively reduced.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an embodiment of a liquid crystal display according to the invention. The liquid crystal display in this embodiment includes a curved panel 31 and a controller 32. The curved panel 31 and the controller 32, the controller 32 is configured to perform Mura compensation on the curved panel using the interpolation point position and the compensation data obtained according to any of the above embodiments and non-conflicting methods in combination.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A method for acquiring compensation data of a curved panel is characterized by comprising the following steps:
acquiring the position of a compensation point of the curved panel and Mura compensation data, wherein the compensation point is the projection of a pixel of the curved panel in a plane image;
performing linear interpolation according to the parameters of the curved surface panel and the positions of the compensation points to obtain the positions of interpolation points, wherein the interpolation points are pixels of the curved surface panel;
judging whether the interpolation point has the compensation point superposed with the interpolation point;
when the interpolation point has the compensation point superposed with the interpolation point, taking Mura compensation data of the superposed compensation point as compensation data of the interpolation point, and when the interpolation point has no compensation point superposed with the interpolation point, taking the weighted sum of the Mura compensation data of two compensation points adjacent to the interpolation point as the compensation data of the interpolation point;
wherein the weighted sum is:
y＝(P*d1+Q*d2)/(2d/X)，
wherein y is the weighted sum, P and Q are Mura compensation data of a second compensation point and a first compensation point adjacent to the interpolation point, respectively, d1 is a horizontal distance between the first compensation point and the interpolation point, d2 is a horizontal distance between the second compensation point and the interpolation point, d is a half chord length of the curved panel, d1 ═ X- (2 d/X)'m 1|, d2 ═ X- (2d/X) × m2|, m1 and m2 are minimum values of differences between sequence numbers of the first compensation point and the second compensation point in a horizontal line and sequence numbers of edge pixels in the same line, respectively, and X is the number of pixels in the horizontal direction of the plane image;
wherein the position of the interpolation point is:
x＝n*L*cos(μ1)+k(n*(n-1)/2)，
wherein x is a minimum value of a horizontal distance between the interpolation point and a vertical edge of the plane image, n is a minimum value of a difference between a sequence number of the curved panel pixel corresponding to the interpolation point in a horizontal line on the curved panel and a sequence number of an edge pixel in the same line, L is a straight line distance between adjacent pixels on the curved panel, L is 2 sin (α/2) R, α is 180 c/(π R), R is a radius of the curved panel, c is a curved distance between adjacent pixels on the curved panel, μ 1 is arccos (L/(2R)) -arccos (d/R), k is a difference between two consecutive pairs of adjacent interpolation points on a projection plane, k is (L-L is cos (μ 1))/(M/2), and M is a number of pixels in a horizontal direction of the curved panel.
2. The method of claim 1, wherein obtaining the locations of the compensation points and Mura compensation data for the curved panel comprises:
shooting the curved panel by using a camera device to obtain a plane image of the curved panel;
and acquiring the position of the compensation point and Mura compensation data according to the plane image.
3. The method of claim 2,
and the camera device shoots on the central axis at the specified distance from the curved panel.
4. The method of claim 1, wherein the step of performing linear interpolation according to the parameters of the curved panel and the position of the compensation point to obtain the position of the interpolation point comprises:
and performing the linear interpolation in the horizontal direction according to the parameters of the curved surface panel and the position of the compensation point to obtain the position of the interpolation point.
5. The method of claim 1, wherein obtaining the locations of the compensation points and Mura compensation data for the curved panel comprises:
and acquiring the positions of the compensation points of the curved panel and Mura compensation data for at least three times, wherein the gray levels of the display pictures of the curved panel acquired each time are different.
6. The method of claim 5, wherein the gray scale of the display screen of the curved panel is selected from a gray scale interval comprising 0 gray scale and a maximum gray scale.
7. A liquid crystal display comprising a curved panel and a controller for performing Mura compensation on the curved panel using the interpolation point position and compensation data acquired according to any one of claims 1 to 6.
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| TWI663577B (en) | 2018-06-04 | 2019-06-21 | 宏碁股份有限公司 | Demura system for non-planar screen |
| CN110581943B (en) * | 2018-06-11 | 2021-04-02 | 宏碁股份有限公司 | Color mura defect compensation system for non-planar screens |
| CN110085166B (en) * | 2018-07-30 | 2020-09-08 | 武汉华星光电半导体显示技术有限公司 | Bright spot compensation method and device for curved screen |
| CN111754906B (en) * | 2020-06-30 | 2022-09-27 | 上海天马微电子有限公司 | Method for detecting brightness uniformity of curved surface display screen |
| CN113643671A (en) * | 2021-10-14 | 2021-11-12 | 惠科股份有限公司 | Defect compensation method and device of display panel and terminal equipment |
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| CN104575322B (en) * | 2014-12-30 | 2017-07-28 | 上海中航光电子有限公司 | A kind of two-d display panel and display device |
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