CN106952629B - Repairing method, compensating device and liquid crystal display aiming at regular mura - Google Patents
Repairing method, compensating device and liquid crystal display aiming at regular mura Download PDFInfo
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- CN106952629B CN106952629B CN201710326322.9A CN201710326322A CN106952629B CN 106952629 B CN106952629 B CN 106952629B CN 201710326322 A CN201710326322 A CN 201710326322A CN 106952629 B CN106952629 B CN 106952629B
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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- 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
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Abstract
The invention relates to a repairing processing method, a compensation device and a liquid crystal display aiming at regular mura, wherein the repairing processing method comprises the steps of 10 calculating mura compensation data required by each pixel point, 20 calculating a mura curved surface expression formula which is optimally matched according to a three-dimensional distribution pattern of the mura compensation data required by each pixel point and storing the mura curved surface expression formula in a flash memory, 30 storing mura compensation data of pixels with fixed positions in the flash memory, 40 reading the mura compensation data and the mura curved surface expression formula in the flash memory by a time sequence control chip, calculating corresponding mura compensation data according to pixel positions of input gray scale data and outputting gray scale data after mura compensation.
Description
Technical Field
The invention relates to the field of liquid crystal displays, in particular to repairing and processing methods and compensation devices aiming at regular mura and a liquid crystal display.
Background
Flat panel display devices such as Liquid Crystal Displays (LCDs) have advantages such as high image quality, power saving, thin body, and application range , and thus is widely used in various consumer electronics products such as mobile phones, televisions, personal digital assistants, digital cameras, notebook computers, and desktop computers, and is becoming the mainstream of display devices.
As shown in fig. 1A, it is a block diagram of a conventional luminance/dark unevenness compensation apparatus. In order to solve the mura caused by the defects in the LCD process/device, the conventional mura compensation method stores the gray scale compensation data in a flash memory (flash)11 collocated with a panel (panel), then a timing control chip (TCON IC)12 reads the mura compensation data stored in the flash memory, the gray scale data is input to the timing control chip 12, a De-mura compensation module 13 performs an operation according to the mura compensation data and the gray scale data to adjust the gray scale value, and then the timing control chip 12 outputs the gray scale data after mura compensation to change the brightness of the pixels to achieve the mura repairing effect. FIG. 1B is a diagram illustrating the original panel shading and shading compensation data. The reverse gray scale compensation value of the position with uneven brightness, namely De-mura compensation data, stored in the flash memory is as follows: in the area brighter than the central position of the panel, the compensation value is negative, the gray scale value is reduced, and the panel becomes dark; in the area darker than the central position of the panel, the compensation value is positive, the gray scale value is increased, and the brightness is increased.
Referring to fig. 2, a schematic diagram of a method for calculating luminance/dark unevenness compensation data in the prior art is shown. In the prior art, the flash memory stores reference values (shown in fig. 2 as 8 × 8 fixed intervals) a, B, C, and D of the uneven brightness compensation data at each vertex pixel position in the fixed interval region, and the uneven brightness compensation data E, F, and G of the remaining pixels are obtained by performing linear interpolation calculation on the uneven brightness compensation data a, B, C, and D of the four vertex pixels in the 8 × 8 interval region.
Fig. 3 is a schematic diagram illustrating the effect of calculating the brightness unevenness compensation data by linear interpolation for the fixed interval settings of 8 × 8 and 16 × 16 in the prior art. It can be seen that when linear interpolation is used to calculate the luminance-dark unevenness compensation data, the linear compensation effect of the fixed interval setting of 8 × 8 is better than that of the fixed interval setting of 16 × 16, and is closer to the ideal mura compensation data. The prior art has the defects that as the resolution of the panel is higher and higher, namely, more and more pixels are provided, more and more reference data for compensating the brightness unevenness are stored in the flash memory, and the storage capacity of the flash memory needs to be increased; if the fixed interval region is enlarged (for example, 16 × 16, 32 × 32, etc.), referring to the compensation data calculation method shown in fig. 2, the brightness/darkness non-uniformity compensation data reference values a, B, C, D at each vertex pixel position in the 16 × 16 or 32 × 32 fixed interval region, and the brightness/darkness non-uniformity compensation data E, F, G of the remaining pixels may be calculated by linear interpolation from the brightness/darkness non-uniformity compensation data a, B, C, D of the four vertex pixels in the 16 × 16 or 32 × 32 interval region.
For 16 by 16 spaced regions:
E＝[(16－Y)*A+Y*C]/16；
F＝[(16－Y)*B+Y*D]/16；
G＝[(16－X)*E+X*F]/16。
for 32 × 32 spaced regions:
E＝[(32－Y)*A+Y*C]/32；
F＝[(32－Y)*B+Y*D]/32；
G＝[(32－X)*E+X*F]/32。
the linear interpolation of each pixel in the fixed interval region will be inaccurate (the brightness variation will change non-linearly in the set fixed interval region).
Disclosure of Invention
The invention aims to provide repair processing methods aiming at the regular mura which can be approximately expressed by a curved surface formula, and the use of the flash memory capacity is reduced.
The invention also aims to provide compensation devices aiming at the regular mura which can be approximately expressed by a curved surface formula, and the use of the flash memory capacity is reduced.
The invention further is directed to providing lcd for regular mura that can be approximately expressed by a curved formula, reducing the use of flash memory capacity.
In order to achieve the above object, the present invention provides repair processing methods for regular mura, comprising:
and step 40, when the mura repairing is carried out, the time sequence control chip reads the mura compensation data and the mura curved surface expression formula in the flash memory, calculates the corresponding mura compensation data according to the pixel position of the input gray-scale data, and outputs the gray-scale data after the mura compensation.
The distribution graph in three dimensions is three-dimensional distribution presented in a three-dimensional coordinate system which takes the plane coordinates of the pixel points as an x axis and a y axis and takes the size of the mura compensation data as a z axis.
Wherein the three-dimensional distribution of the mura compensation data of the regular mura in the panel area and on the brightness and darkness can be approximately expressed by a simple curved surface formula.
Wherein, the three-dimensional distribution of the mura compensation data of the regular mura in the panel area and on the brightness and darkness comprises three-dimensional distribution which is approximate to a cambered surface.
Wherein the three-dimensional distribution of the mura compensation data of the regular mura in the panel area and on the brightness and darkness includes an approximately wavy three-dimensional distribution.
The invention also provides compensation devices for regular mura, which comprise a flash memory and a time sequence control chip, wherein the flash memory stores mura curved surface expression formulas and the mura compensation data of fixed position pixels, when the mura repair processing is carried out, the time sequence control chip reads the mura compensation data and the mura curved surface expression formulas in the flash memory, calculates the corresponding mura compensation data according to the pixel positions of the input gray scale data, and then outputs the gray scale data after the mura compensation.
Wherein the three-dimensional distribution of the mura compensation data of the regular mura in the panel area and on the brightness and darkness can be approximately expressed by a simple curved surface formula.
Wherein, the three-dimensional distribution of the mura compensation data of the regular mura in the panel area and on the brightness and darkness comprises three-dimensional distribution which is approximate to a cambered surface.
Wherein the three-dimensional distribution of the mura compensation data of the regular mura in the panel area and on the brightness and darkness includes an approximately wavy three-dimensional distribution.
The invention also provides liquid crystal display devices, which comprise the compensation device aiming at the regular mura.
In summary, the invention aims at the repairing method and the compensating device of the regular mura and the liquid crystal display, and aims at the regular mura which can be approximately expressed by a curved surface formula, the mura compensation data of all pixel positions are calculated and completed through the distribution curve and the mura compensation data of a very small quantity of fixed pixel positions, and the use of the flash memory capacity is reduced; the flash memory only needs to store a very small amount of mura compensation data and a mura curved surface distribution expression formula, and a good whole-face mura repairing effect of the panel can be obtained.
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The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.
In the drawings, there is shown in the drawings,
FIG. 1A is a block diagram of a conventional device for compensating for uneven brightness;
FIG. 1B is a diagram of the original luminance and dark non-uniformity compensation data of the panel;
FIG. 2 is a diagram illustrating a method for calculating uneven brightness compensation data in the prior art;
fig. 3 is a schematic diagram illustrating the effect of calculating the brightness and dark unevenness compensation data by linear interpolation for the fixed interval settings of 8 × 8 and 16 × 16 in the prior art;
FIG. 4 is a schematic diagram of the repair process for regular mura according to the present invention;
FIG. 5 is a schematic diagram of a preferred embodiment of a repair process for regular mura according to the invention;
FIG. 6 is a block diagram of a preferred embodiment of a compensation device for regular mura according to the present invention;
FIG. 7 is a flowchart of a repair processing method for regular mura according to the present invention.
Detailed Description
Referring to fig. 4, which is a schematic diagram of a principle of a repair processing method for regular mura according to the present invention, three-dimensional distributions (pixel coordinates and compensation gray scale values can be used as three-dimensional coordinates) are presented in a panel region and on brightness and darkness for the regular mura, that is, when the three-dimensional distributions of the mura have regularity and can be approximately expressed by simpler curved surface formulas, such as an arc surface (the periphery is uniformly bright or dark), a wave shape (the brightness and the darkness are alternately changed at equal intervals), and the like, a small number of mura compensation values at fixed pixel positions and a curved surface expression formula can be stored in a flash memory, so that a flash memory capacity required for storing reference values of mura compensation data is greatly reduced.
Referring to FIG. 7, it is a flow chart of the repairing process method for regular mura of the present invention. The method mainly comprises the following steps:
and step 40, when the mura repairing is carried out, the time sequence control chip reads the mura compensation data and the mura curved surface expression formula in the flash memory, calculates the corresponding mura compensation data according to the pixel position of the input gray-scale data, and outputs the gray-scale data after the mura compensation. And after the time sequence control chip reads the mura compensation data of the fixed position pixels and the mura curved surface expression formula from the flash memory, substituting the pixel positions of the input gray scale data and the mura compensation data of the fixed position pixels into the mura curved surface expression formula as parameters, and obtaining the mura compensation data of the non-fixed position pixels through nonlinear calculation.
Referring to fig. 5, which is a schematic diagram of a preferred embodiment of a repair processing method for regular mura according to the present invention, after a camera of a mura repair device photographs brightness differences of the entire display area of a panel, gray scale data required to be compensated for each pixel point is calculated, and then an expression formula of a best-matching curved mura form is calculated according to distribution patterns of the gray scale compensation data on three dimensions (x and y are pixel coordinates, and z is a compensation gray scale value size).
Referring to fig. 6, which is a block diagram illustrating a preferred embodiment of a compensation apparatus for regular mura according to the present invention, the compensation apparatus for regular mura mainly includes a flash memory 61 and a timing control chip 62, the flash memory 61 stores a mura curved surface expression formula and mura compensation data of fixed-position pixels, when performing a mura repairing process, a De-mura module 63 of the timing control chip 62 reads the mura compensation data and the mura curved surface expression formula in the flash memory 61, calculates corresponding mura compensation data according to pixel positions of input gray scale data by a non-linear calculation instead of a linear interpolation calculation, and outputs the mura compensated gray scale data.
By applying the compensation device aiming at the regular mura, the invention also provides a corresponding liquid crystal display device.
In summary, the invention aims at the repairing method and the compensating device of the regular mura and the liquid crystal display, and aims at the regular mura which can be approximately expressed by a curved surface formula, the mura compensation data of all pixel positions are calculated and completed through the distribution curve and the mura compensation data of a very small quantity of fixed pixel positions, and the use of the flash memory capacity is reduced; the flash memory only needs to store a very small amount of mura compensation data and a mura curved surface distribution expression formula, and a good whole-face mura repairing effect of the panel can be obtained.
As described above, it will be apparent to those skilled in the art that various other changes and modifications can be made based on the technical solution and the technical idea of the present invention, and all such changes and modifications should fall within the protective scope of the appended claims.
Claims (8)
1, A repairing method for regular mura, comprising:
step 10, shooting the brightness difference of the whole display area of the panel through a camera, and calculating mura compensation data required by each pixel point;
step 20, calculating an optimally matched mura curved surface expression formula according to a three-dimensional distribution pattern of mura compensation data required by each pixel point and storing the optimally matched mura curved surface expression formula in a flash memory;
step 30, storing mura compensation data of fixed position pixels in the flash memory;
step 40, when carrying out mura repairing treatment, the time sequence control chip reads the mura compensation data and the mura curved surface expression formula in the flash memory, calculates the corresponding mura compensation data according to the pixel position of the input gray scale data, and then outputs the gray scale data after mura compensation; after the time sequence control chip reads the mura compensation data of the fixed position pixels and the mura curved surface expression formula from the flash memory, substituting the pixel positions of the input gray scale data and the mura compensation data of the fixed position pixels into the mura curved surface expression formula as parameters to obtain the mura compensation data of the non-fixed position pixels;
the three-dimensional distribution of the mura compensation data of the regular mura in the panel area and on the brightness and darkness can be approximately expressed by a simple curved surface formula;
the three-dimensional distribution of the mura compensation data of the regular mura in the panel area and on the brightness and darkness includes a three-dimensional distribution which is approximate to a cambered surface.
2. A repair processing method for regular mura according to claim 1, wherein the distribution pattern in three dimensions is a three-dimensional distribution represented in a three-dimensional coordinate system having a pixel point plane coordinate as an x-axis, a y-axis, and a mura compensation data size as a z-axis.
3, A repairing method for regular mura, comprising:
step 10, shooting the brightness difference of the whole display area of the panel through a camera, and calculating mura compensation data required by each pixel point;
step 20, calculating an optimally matched mura curved surface expression formula according to a three-dimensional distribution pattern of mura compensation data required by each pixel point and storing the optimally matched mura curved surface expression formula in a flash memory;
step 30, storing mura compensation data of fixed position pixels in the flash memory;
step 40, when carrying out mura repairing treatment, the time sequence control chip reads the mura compensation data and the mura curved surface expression formula in the flash memory, calculates the corresponding mura compensation data according to the pixel position of the input gray scale data, and then outputs the gray scale data after mura compensation; after the time sequence control chip reads the mura compensation data of the fixed position pixels and the mura curved surface expression formula from the flash memory, substituting the pixel positions of the input gray scale data and the mura compensation data of the fixed position pixels into the mura curved surface expression formula as parameters to obtain the mura compensation data of the non-fixed position pixels;
the three-dimensional distribution of the mura compensation data of the regular mura in the panel area and on the brightness and darkness can be approximately expressed by a simple curved surface formula;
the three-dimensional distribution of the mura compensation data of the regular mura in the panel area and on the brightness and darkness includes a three-dimensional distribution that is approximately wavy.
4. A repair processing method for regular mura according to claim 3, wherein the distribution pattern in three dimensions is a three-dimensional distribution represented in a three-dimensional coordinate system having a pixel point plane coordinate as an x-axis, a y-axis, and a mura compensation data size as a z-axis.
5, compensation devices for regular mura, which is characterized in that the device comprises a flash memory and a time sequence control chip, wherein the flash memory stores a mura curved surface expression formula and mura compensation data of fixed position pixels, when mura restoration processing is carried out, the time sequence control chip reads the mura compensation data and the mura curved surface expression formula in the flash memory, calculates the corresponding mura compensation data according to the pixel position of the input gray scale data, and outputs the gray scale data after mura compensation;
the three-dimensional distribution of the mura compensation data of the regular mura in the panel area and on the brightness and darkness can be approximately expressed by a simple curved surface formula;
the three-dimensional distribution of the mura compensation data of the regular mura in the panel area and on the brightness and darkness includes a three-dimensional distribution which is approximate to a cambered surface.
A liquid crystal display device of , comprising the compensation device for regular mura of claim 5.
7, compensation devices for regular mura, which is characterized in that the device comprises a flash memory and a time sequence control chip, wherein the flash memory stores a mura curved surface expression formula and mura compensation data of fixed position pixels, when the mura restoration processing is carried out, the time sequence control chip reads the mura compensation data and the mura curved surface expression formula in the flash memory, calculates the corresponding mura compensation data according to the pixel position of the input gray scale data, and outputs the gray scale data after the mura compensation;
the three-dimensional distribution of the mura compensation data of the regular mura in the panel area and on the brightness and darkness can be approximately expressed by a simple curved surface formula;
the three-dimensional distribution of the mura compensation data of the regular mura in the panel area and on the brightness and darkness includes a three-dimensional distribution that is approximately wavy.
A liquid crystal display device of , comprising the compensation device for regular mura of claim 7.
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| US10540942B2 (en) | 2017-08-25 | 2020-01-21 | HKC Corporation Limited | Optimization method and pre-stage device for brightness compensation |
| CN107331347B (en) * | 2017-08-25 | 2019-12-31 | 惠科股份有限公司 | Optimization mode and optimization equipment for brightness compensation |
| CN107680526A (en) * | 2017-10-13 | 2018-02-09 | 深圳吉迪思电子科技有限公司 | A kind of brightness Mura compensation methodes |
| CN109801581B (en) * | 2019-01-31 | 2022-04-19 | 武汉天马微电子有限公司 | Display panel compensation gray scale value determination method and device and display device |
| CN110689843B (en) * | 2019-08-19 | 2021-10-12 | 昆山国显光电有限公司 | Demura system and method and electronic equipment |
| CN113393811B (en) * | 2020-03-12 | 2022-06-28 | 咸阳彩虹光电科技有限公司 | Luminance unevenness compensation method and device and display panel |
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