CN111583884B - White balance adjusting method and device - Google Patents

White balance adjusting method and device Download PDF

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Publication number
CN111583884B
CN111583884B CN202010472740.0A CN202010472740A CN111583884B CN 111583884 B CN111583884 B CN 111583884B CN 202010472740 A CN202010472740 A CN 202010472740A CN 111583884 B CN111583884 B CN 111583884B
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sub
pixel
panel
detected
image parameter
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CN111583884A (en
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海博
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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    • G—PHYSICS
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction

Abstract

The application provides a white balance adjusting method and a device thereof, and the method comprises the following steps: acquiring a first image parameter of a panel to be detected; acquiring a white balance compensation coefficient of a panel to be detected; acquiring a second image parameter of the panel to be detected according to the ratio of the first image parameter of the panel to be detected to the white balance compensation coefficient; converting the second image parameter into a third image parameter by a first function; and acquiring the gray scale voltage corresponding to each sub-pixel of the panel to be detected according to the third image parameter of the panel to be detected. According to the method and the device, the original image parameters are processed to obtain the white balance compensation coefficient of the panel to be detected, the target image parameters are obtained according to the ratio of the original image parameters to the white balance compensation coefficient, the gray scale voltage corresponding to each sub-pixel is obtained according to the target brightness obtained by the preset gamma value and the target image parameters, when the sub-pixels are independently displayed, the influence of the low voltage corresponding to the dark sub-pixels on the high voltage corresponding to the bright sub-pixels is eliminated, and the display quality of the display is improved.

Description

White balance adjusting method and device
Technical Field
The present disclosure relates to display technologies, and in particular, to a method and an apparatus for adjusting white balance.
Background
Due to the driving and characteristics of the liquid crystal panel, the white balance gray scale color representation has a considerable color shift difference. In order to achieve a certain accuracy and consistency of the display colors, the gray white balance (gray white balance) of the display must be adjusted one by one.
In the conventional display, when the RGB sub-pixels are separately displayed, the low voltages corresponding to the two sub-pixels in the low gray scale state will affect the high voltage of the sub-pixel in the high gray scale state, so that the RGB monochrome luminance will be reduced; when the display is W, RGB is full bright, namely, all three sub-pixels of RGB correspond to high voltage, and the influence between the three sub-pixels of RGB on the brightness is small, namely, the brightness of W is high. Therefore, in the conventional display, when WRGB is at any gray level, the sum of the luminance of W and the luminance of the three RGB sub-pixels is not equal, which affects the display quality of the display.
Therefore, a method for adjusting white balance is needed to solve the above technical problems.
Disclosure of Invention
The application provides a white balance adjusting method and device to solve the technical problem of low display quality of the existing display.
In order to solve the above problems, the technical solution provided by the present application is as follows:
the application provides a white balance adjustment method, which comprises the following steps:
acquiring a first image parameter of a panel to be detected;
acquiring a white balance compensation coefficient of the panel to be detected according to the first image parameter of the panel to be detected;
acquiring a second image parameter of the panel to be detected according to the ratio of the first image parameter of the panel to be detected to the white balance compensation coefficient;
converting the second image parameter of the panel to be detected from low bit depth to high bit depth by using a first function to obtain a third image parameter of the panel to be detected;
and acquiring gray scale voltage corresponding to each sub-pixel of the panel to be detected according to the third image parameter of the panel to be detected.
In the white balance adjustment method of the present application, the step of obtaining a first image parameter of a panel to be measured includes:
scanning the panel to be detected to obtain the brightness value L of the R sub-pixel of the panel to be detected in the ith gray scaleR(i) G sub-pixel brightness value LG(i) Luminance value L of B sub-pixelB(i) And the luminance value L of the W sub-pixelW(i) Wherein i is an integer of 0 to M.
In the white balance adjustment method of the present application, the step of obtaining the white balance compensation coefficient of the panel to be measured according to the first image parameter of the panel to be measured includes:
obtaining the brightness value L of the R sub-pixel of the panel to be tested at the Mth gray scaleRLuminance values L of (M) and G sub-pixelsGLuminance values L of (M) and B sub-pixelsB(M) and luminance value L of W sub-pixelW(M) and acquiring the brightness value L of the R sub-pixel of the panel to be detected in the nth gray scaleRLuminance values L of (n) and G sub-pixelsGLuminance values L of (n) and B sub-pixelsB(n) and the luminance value L of the W sub-pixelW(n)；
Obtaining the brightness L of a pixel when the panel to be detected is in a dark stateP；
Obtaining the correction coefficient b of the compensation coefficient of the panel to be measured which is 1- { (L)R(M)+LG(M)+LB(M)-2LP)/LW(M)}；
Obtaining the compensation coefficient a { (L) of the nth gray scale of the panel to be testedR(n)+LG(n)+LB(n)-2LP)/LW(n)}+b；
Wherein n is an integer of 0 to M.
In the white balance adjustment method of the present application, before obtaining the gray scale voltage corresponding to each sub-pixel of the panel to be tested, the method further includes:
and enabling the gamma value of the panel to be detected to be a first threshold value so as to obtain a first target brightness of the panel to be detected.
In the white balance adjustment method of the present application, the step of obtaining the gray scale voltage corresponding to each sub-pixel of the panel to be detected according to the third image parameter of the panel to be detected includes:
acquiring the brightness value of a first sub-pixel in the RGB sub-pixels corresponding to each gray scale according to the first target brightness of the panel to be detected;
acquiring the brightness values of the second sub-pixel and the third sub-pixel corresponding to the gray scales according to the brightness value of the first sub-pixel corresponding to the gray scales and the third image parameter of the panel to be detected;
acquiring gray scale voltages corresponding to the gray scales of the first sub-pixel, the second sub-pixel and the third sub-pixel according to the brightness values corresponding to the gray scales of the first sub-pixel, the second sub-pixel and the third sub-pixel;
wherein the first sub-pixel, the second sub-pixel, and the third sub-pixel are different ones of an R sub-pixel, a G sub-pixel, and a B sub-pixel.
The application provides a white balance adjusting device, which comprises an acquisition module, a compensation module, an image parameter calculation module, a bit depth conversion module and an adjusting module;
the acquisition module is used for acquiring a first image parameter of the panel to be detected;
the compensation module is used for acquiring a white balance compensation coefficient of the panel to be detected according to the first image parameter of the panel to be detected;
the image parameter calculation module is used for acquiring a second image parameter of the panel to be detected according to the ratio of the first image parameter of the panel to be detected to the white balance compensation coefficient;
the bit depth conversion module is used for converting the second image parameter of the panel to be detected from low bit depth to high bit depth by using a first function so as to obtain a third image parameter of the panel to be detected;
and the adjusting module is used for acquiring the gray scale voltage corresponding to each sub-pixel of the panel to be detected according to the third image parameter of the panel to be detected.
In the white balance adjustment device of the present application, the acquisition module includes a scanning unit and a luminance acquisition unit;
the scanning unit is used for scanning the panel to be detected;
the brightness acquisition unit is used for acquiring the brightness value L of the R sub-pixel of the panel to be detected in the ith gray scaleR(i) G sub-pixel brightness value LG(i) Luminance value L of B sub-pixelB(i) And the luminance value L of the W sub-pixelW(i) Wherein i is an integer of 0 to M.
In the white balance adjustment device of the present application, the compensation module includes a first obtaining unit, a dark state luminance calculating unit, a correcting unit, and a compensating unit;
the first acquisition unit is used for acquiring the brightness value L of the R sub-pixel of the panel to be detected in the Mth gray scaleRLuminance values L of (M) and G sub-pixelsGLuminance values L of (M) and B sub-pixelsB(M) and luminance value L of W sub-pixelW(M) and acquiring the brightness value L of the R sub-pixel of the panel to be detected in the nth gray scaleRLuminance values L of (n) and G sub-pixelsGLuminance values L of (n) and B sub-pixelsB(n) and the luminance value L of the W sub-pixelW(n)；
The dark state brightness calculation unit is used for acquiring the brightness L of one pixel when the panel to be detected is in a dark stateP；
The correction unit is used for obtaining a correction coefficient b ═ 1- { (L) of the compensation coefficient of the panel to be measuredR(M)+LG(M)+LB(M)-2LP)/LW(M)}；
The compensation unit is used for acquiring a compensation coefficient a { (L) of the nth gray scale of the panel to be testedR(n)+LG(n)+LB(n)-2LP)/LW(n)}+b；
Wherein n is an integer of 0 to M.
In the white balance adjustment device of the present application, the white balance adjustment device further includes a target luminance calculation module;
the target brightness calculation module is used for enabling the gamma value of the panel to be detected to be a first threshold value so as to obtain the target brightness of the panel to be detected.
In the white balance adjusting device of the present application, the adjusting module includes a first calculating unit, a second calculating unit, and a third calculating unit;
the first computing unit is used for acquiring the brightness value of a first sub-pixel in the RGB sub-pixels corresponding to each gray scale according to the target brightness of the panel to be detected;
the second calculating unit is used for acquiring the brightness values of the second sub-pixel and the third sub-pixel at each gray scale according to the brightness value of the first sub-pixel at each gray scale and the third image parameter of the panel to be detected;
the third calculating unit is used for acquiring gray scale voltages corresponding to the gray scales of the first sub-pixel, the second sub-pixel and the third sub-pixel according to the brightness values corresponding to the gray scales of the first sub-pixel, the second sub-pixel and the third sub-pixel;
wherein the first sub-pixel, the second sub-pixel, and the third sub-pixel are different ones of an R sub-pixel, a G sub-pixel, and a B sub-pixel.
Has the advantages that: according to the method and the device, the original image parameters are processed to obtain the white balance compensation coefficient of the panel to be detected, the target image parameters are obtained according to the ratio of the original image parameters to the white balance compensation coefficient, and the gray scale voltage corresponding to each sub-pixel is obtained according to the target brightness and the target image parameters obtained by the preset gamma value, so that the influence of the low voltage corresponding to the dark sub-pixel on the high voltage corresponding to the bright sub-pixel when the sub-pixels are independently displayed is eliminated, and the display quality of the display is improved.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
FIG. 1 is a diagram illustrating the steps of a white balance adjustment method according to the present application;
FIG. 2 is a graph showing the ratio of (R + G + B) to W for each gray level in the white balance adjustment method of the present application;
fig. 3 is a first structural view of the white balance adjustment apparatus of the present application;
fig. 4 is a second structural view of the white balance adjustment apparatus of the present application;
fig. 5 is a third structural view of the white balance adjustment device according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
In the conventional display, when the RGB sub-pixels are separately displayed, the low voltages corresponding to the two sub-pixels in the low gray scale state will affect the high voltage of the sub-pixel in the high gray scale state, so that the RGB monochrome luminance will be reduced; when the display is W, RGB is full bright, namely, all three sub-pixels of RGB correspond to high voltage, and the influence between the three sub-pixels of RGB on the brightness is small, namely, the brightness of W is high. Therefore, in the conventional display, when WRGB is at any gray level, the sum of the luminance of W and the luminance of the three RGB sub-pixels is not equal, which affects the display quality of the display. The present application provides a white balance adjustment method and device based on the above technical problems.
Referring to fig. 1, the white balance adjustment method includes:
s10, acquiring a first image parameter of the panel to be detected;
in this step, the first image parameter of the panel to be tested may be obtained through a scanning device, a reading device, and the like, and the present application is not particularly limited.
The step is mainly used for obtaining the brightness corresponding to each sub-pixel of the panel to be tested under any gray scale, for example, the brightness value L of the R sub-pixel of the panel to be tested under the ith gray scaleR(i) G sub-pixel brightness value LG(i) Luminance value L of B sub-pixelB(i) And the luminance value L of the W sub-pixelW(i)。
In this embodiment, i is an integer of 0 to M, and M may be 28-1，210-1, etc., and is not particularly limited herein.
For example, an 8-bit display panel under test includes 256 gray-scale data. For the red sub-pixel, it includes 256 gray scale data of 0-255, and any gray scale corresponds to a brightness value. Similarly, the green sub-pixel, the blue sub-pixel and the white sub-pixel correspond to 256 gray scale data respectively. Therefore, for the 8-bit display panel to be tested, 1024 gray scale data are obtained through the corresponding device in the step.
S20, acquiring a white balance compensation coefficient of the panel to be detected according to the first image parameter of the panel to be detected;
in this embodiment, step S20 may include:
s201, obtaining the brightness value L of the R sub-pixel of the panel to be tested at the Mth gray scaleRLuminance values L of (M) and G sub-pixelsGLuminance values L of (M) and B sub-pixelsB(M) and luminance value L of W sub-pixelW(M) and acquiring the brightness value L of the R sub-pixel of the panel to be detected in the nth gray scaleRLuminance values L of (n) and G sub-pixelsGLuminance values L of (n) and B sub-pixelsB(n) and the luminance value L of the W sub-pixelW(n)；
From the data obtained in step S10, the present step can easily obtain the brightness value of any sub-pixel of the panel to be tested at any gray level.
In step S201, for example, 8 bits, the value of M is 255. Therefore, step S201 is mainly used to obtain the brightness value L of the R sub-pixel of the panel to be tested at the 255 th gray levelR(255) G sub-pixel brightness value LG(255) Luminance value L of B sub-pixelB(255) And the luminance value L of the W sub-pixelW(255)。
S202, acquiring the brightness L of one pixel when the panel to be detected is in a dark stateP；
S203, obtaining a correction coefficient b of the compensation coefficient of the panel to be measured, wherein the correction coefficient b is 1- { (L)R(M)+LG(M)+LB(M)-2LP)/LW(M)}；
In step S202, for the LCD display panel, when the sub-pixels of the display panel are in the dark state, the backlight is in the normally bright state, so that the backlight has a certain transmittance, and when the panel to be tested is displayed by a single pixel, for example, when the red sub-pixel is displayed, the green and blue sub-pixels are in the dark state, but since the panel has a certain transmittance, the luminance values of the green and blue sub-pixels in the dark state need to be subtracted from the gray-scale luminance corresponding to the green sub-pixel.
Therefore, for L in step S203R(n)+LG(n)+LBThe value of (n) should be subtracted by the luminance of 6 sub-pixels in the dark state, and the dark-state luminance of three sub-pixels is equal to the dark-state luminance of one pixel. Thus, in step S204, (L)R(n)+LG(n)+LB(n)-2LP)/LWThe value of (n) is the ratio of the sum of the luminance of the nth gray scale monochrome sub-pixel of the panel to be tested in the bright state to the luminance of the white sub-pixel of the three sub-pixels in the bright state, and the specific ratio refers to fig. 2, where the X direction in fig. 2 is the gray scale value, and the Y direction is the ratio of (R + G + B) to W.
Taking 8bit as an example for explanation, the correction coefficient of the compensation coefficient of the panel to be measured can be obtained according to the formula: b ═ 1- { (L)R(255)+LG(255)+LB(255)-2LP)/LW(255)}；
As can be seen from FIG. 2, the 255 th order LR(255)+LG(255)+LB(255)-2LP)/LW(255) Not equal to 1, so the 255 th order should be compensated to 1 here, so that the above correction coefficient needs to be obtained.
S204, obtaining the compensation coefficient a { (L) of the nth gray scale of the panel to be testedR(n)+LG(n)+LB(n)-2LP)/LW(n)}+b；
In step S203, since the compensation coefficient of any order needs to be corrected and the correction coefficient b needs to be added, it can be considered that a { (L)R(n)+LG(n)+LB(n)-2LP)/LW(n)}+1-{(LR(255)+LG(255)+LB(255)-2LP)/LW(255)}。
Since the correction coefficient of 0 order or a nearby compensation coefficient higher than 1 is not suitable for the above correction formula, it is only necessary to correct the corresponding compensation coefficient to 1.
In this embodiment, n is an integer of 0 to M.
S30, obtaining a second image parameter of the panel to be detected according to the ratio of the first image parameter of the panel to be detected to the white balance compensation coefficient;
in this step, first, in step S20, the first image parameter of the panel under test and the white balance compensation coefficient of the panel under test are obtained. And secondly, acquiring a second image parameter of the panel to be detected according to the ratio of the first image parameter of the panel to be detected to the white balance compensation coefficient.
In this embodiment, the second image parameter is a target brightness to be achieved after the panel to be measured is compensated.
S40, converting the second image parameter of the panel to be detected from low bit depth to high bit depth by using a first function to obtain a third image parameter of the panel to be detected;
in this step, the data of the image parameter is 8 bits as an example, and this step mainly converts the 8 bits to a higher bit depth. And converting the first image parameter of the panel to be detected from 8bit to 10bit by using a first function so as to obtain a second image parameter of the panel to be detected.
In the present embodiment, the difference between the values of the high bit depth and the low bit depth is not less than 2.
For the 8-bit first image parameter, it includes 256 gray-scale data of 0-255, and the 10-bit image parameter includes 1024 gray-scale data of 0-1023. The present embodiment may, but is not limited to, convert the first image parameter from 8bit to 10bit by using an internal difference method, that is, a plurality of gray scale values are inserted into two adjacent gray scale data in the 8bit image parameter, so that the second image parameter is more refined than the first image parameter.
Before step S50, the white balance adjustment method should further include the steps of:
the gamma value of the panel to be detected is used as a first threshold value to obtain a first target brightness of the panel to be detected.
In this step, the method is mainly used for obtaining a target brightness curve to be reached by the panel to be tested.
The step mainly introduces the concept about the gamma value in the display field, the gamma value is a curve graph of the gray scale and the brightness in the display panel, and different gamma values correspond to different curve graphs.
Taking an 8-bit panel to be tested as an example, the formula of the gamma value related to the gray scale and the brightness is L ═ n/255)γ；
In the above formula, L is the luminance, n is the gray scale value, and γ is the gamma value.
Therefore, on the premise of presetting a gamma value, the present embodiment can acquire a brightness value corresponding to any gray scale of the panel to be tested, i.e., the first target brightness.
In this embodiment, the first threshold may be any value, and is not specifically limited herein.
In this embodiment, the first threshold is 2.2.
And S50, obtaining gray scale voltages corresponding to the sub-pixels of the panel to be detected according to the third image parameters of the panel to be detected.
In this embodiment, step S50 may specifically include:
s501, acquiring brightness values corresponding to the gray scales of first sub-pixels in RGB sub-pixels according to the first target brightness of the panel to be detected;
in this step, first, the luminance is determined based on the first target luminance and L ═ n/255γThe gray level value corresponding to any compensated brightness can be obtained. And secondly, acquiring the brightness value of the seed pixel corresponding to each gray scale according to the curve relation between the gray scale value and the first sub-pixel.
In this embodiment, the curve relationship between the gray-scale value and the first sub-pixel may refer to a distribution rule of the second normalized target luminance.
S502, obtaining the brightness value of the second sub-pixel and the brightness value of the third sub-pixel corresponding to each gray scale according to the brightness value of the first sub-pixel corresponding to each gray scale and the third image parameter of the panel to be detected;
s503, obtaining gray scale voltages corresponding to the gray scales of the first sub-pixel, the second sub-pixel and the third sub-pixel according to the brightness values corresponding to the gray scales of the first sub-pixel, the second sub-pixel and the third sub-pixel;
in steps S502 to S503, the voltages applied to the second sub-pixel and the third sub-pixel are calculated while keeping the white chromaticity of all the gray scales to be displayed constant, and the luminance corresponding to each gray scale on the second normalized target luminance is matched according to the sum of the luminance of the second sub-pixel and the luminance of the third sub-pixel plus the luminance of the first sub-pixel.
In this embodiment, the first sub-pixel, the second sub-pixel, and the third sub-pixel are different ones of an R sub-pixel, a G sub-pixel, and a B sub-pixel.
In this embodiment, the first sub-pixel is a G sub-pixel. Since the green sub-pixel has a large influence on the brightness of white light, the gray scale voltages of the G sub-pixels are preferentially calculated when performing the matching calculation.
In this embodiment, since the gray-scale luminance of the compensated original image parameter may change to a certain extent and there may be a gray-scale luminance that does not correspond to the gray-scale luminance in the original image parameter, when performing the matching calculation of the gray-scale voltages of the RGB sub-pixels, the original image data needs to be converted from a low bit depth to a high bit depth, and the matching range is expanded, so that the matching calculation of the first target luminance and the third image parameter needs to be combined to obtain the voltage values of the remaining two types of sub-pixels.
According to the method and the device, the white balance compensation coefficient of the panel to be detected is obtained by processing the original image parameter, the target image parameter is obtained according to the ratio of the original image parameter to the white balance compensation coefficient, the gray scale voltage corresponding to each sub-pixel is obtained according to the target brightness obtained by the preset gamma value and the target image parameter, the influence of the low voltage corresponding to the dark sub-pixel on the high voltage corresponding to the bright sub-pixel when the sub-pixels are independently displayed is eliminated, and the display quality of the display is improved
Referring to fig. 3, the present application provides a white balance adjustment apparatus 100, which includes an obtaining module 10, a compensation module 20, an image parameter calculating module 30, a bit depth converting module 40, and an adjusting module 50;
the obtaining module 10 is configured to obtain a first image parameter of a panel to be detected;
the compensation module 20 is configured to obtain a white balance compensation coefficient of the panel to be detected according to the first image parameter of the panel to be detected;
the image parameter calculating module 30 is configured to obtain a second image parameter of the panel to be tested according to a ratio of the first image parameter of the panel to be tested to the white balance compensation coefficient;
the bit depth conversion module 40 is configured to convert the second image parameter of the panel to be tested from a low bit depth to a high bit depth by using a first function to obtain a third image parameter of the panel to be tested;
the adjusting module 50 is configured to obtain a gray scale voltage corresponding to each sub-pixel of the panel to be detected according to the third image parameter of the panel to be detected.
Referring to fig. 4, the acquiring module 10 includes a scanning unit 101 and a brightness acquiring unit 102;
the scanning unit 101 is used for scanning the panel to be detected;
the brightness obtaining unit 102 is configured to obtain a brightness value L of an R sub-pixel of the panel to be tested at an ith gray scaleR(i) G sub-pixel brightness value LG(i) Luminance value L of B sub-pixelB(i) And the luminance value L of the W sub-pixelW(i) Wherein i is an integer of 0 to M.
Referring to fig. 4, the compensation module 20 includes a first obtaining unit 201, a dark state luminance calculating unit 202, a correcting unit 203 and a compensating unit 204;
the first obtaining unit 201 is configured to obtain a brightness value L of an R sub-pixel of the panel to be tested at an mth gray levelRLuminance values L of (M) and G sub-pixelsGLuminance values L of (M) and B sub-pixelsB(M) and luminance value L of W sub-pixelW(M) and acquiring the brightness value L of the R sub-pixel of the panel to be detected in the nth gray scaleRLuminance values L of (n) and G sub-pixelsGLuminance values L of (n) and B sub-pixelsB(n) and the luminance value L of the W sub-pixelW(n)；
The dark state luminance calculating unit 202 is used for obtainingWhen the panel to be measured is in a dark state, the brightness L of one pixelP；
The correction unit 203 is configured to obtain a correction coefficient b ═ 1- { (L) of the compensation coefficient of the panel to be measuredR(M)+LG(M)+LB(M)-2LP)/LW(M)}；
The compensation unit 204 is used for obtaining a compensation coefficient a { (L) of the nth gray scale of the panel under testR(n)+LG(n)+LB(n)-2LP)/LW(n)}+b；
Wherein n is an integer of 0 to M.
Referring to fig. 5, the white balance adjustment apparatus 100 further includes a target brightness calculation module 60;
the target brightness calculation module 60 is configured to make the gamma value of the panel to be tested be a first threshold value, so as to obtain the target brightness of the panel to be tested.
Referring to fig. 4, the adjusting module 50 includes a first calculating unit 501, a second calculating unit 502 and a third calculating unit 503;
the first calculating unit 501 is configured to obtain, according to the target brightness of the panel to be detected, a brightness value corresponding to each gray scale of a first sub-pixel in the RGB sub-pixels;
the second calculating unit 502 is configured to obtain, according to the brightness value of the first sub-pixel corresponding to each gray scale and the third image parameter of the panel to be detected, the brightness value of the second sub-pixel and the brightness value of the third sub-pixel corresponding to each gray scale;
the third calculating unit 503 is configured to obtain gray scale voltages corresponding to gray scales of the first sub-pixel, the second sub-pixel and the third sub-pixel according to brightness values corresponding to gray scales of the first sub-pixel, the second sub-pixel and the third sub-pixel;
wherein the first sub-pixel, the second sub-pixel, and the third sub-pixel are different ones of an R sub-pixel, a G sub-pixel, and a B sub-pixel.
In this embodiment, the working principle of the white balance adjustment apparatus may refer to the white balance adjustment method, and will not be described in detail herein.
The application provides a white balance adjusting method and a device thereof, and the method comprises the following steps: acquiring a first image parameter of a panel to be detected; acquiring a white balance compensation coefficient of the panel to be detected; acquiring a second image parameter of the panel to be detected according to the ratio of the first image parameter of the panel to be detected to the white balance compensation coefficient; converting the second image parameter into a third image parameter by a first function; and acquiring gray scale voltage corresponding to each sub-pixel of the panel to be detected according to the third image parameter of the panel to be detected. According to the method and the device, the original image parameters are processed to obtain the white balance compensation coefficient of the panel to be detected, the target image parameters are obtained according to the ratio of the original image parameters to the white balance compensation coefficient, and the gray scale voltage corresponding to each sub-pixel is obtained according to the target brightness and the target image parameters obtained by the preset gamma value, so that the influence of the low voltage corresponding to the dark sub-pixel on the high voltage corresponding to the bright sub-pixel when the sub-pixels are independently displayed is eliminated, and the display quality of the display is improved.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The foregoing describes in detail an electronic device provided in an embodiment of the present application, and a specific example is applied to illustrate the principle and the implementation of the present application, and the description of the foregoing embodiment is only used to help understanding the technical solution and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.

Claims (9)

1. A white balance adjustment method, comprising:
acquiring a first image parameter of a panel to be detected, wherein the step of acquiring the first image parameter of the panel to be detected comprises the following steps:
scanning the panel to be detected to obtain the brightness value L of the R sub-pixel of the panel to be detected in the ith gray scaleR(i) G sub-pixel brightness value LG(i) Luminance value L of B sub-pixelB(i) And the luminance value L of the W sub-pixelW(i) Wherein i is an integer of 0 to M;
acquiring a white balance compensation coefficient of the panel to be detected according to the first image parameter of the panel to be detected;
acquiring a second image parameter of the panel to be detected according to the ratio of the first image parameter of the panel to be detected to the white balance compensation coefficient;
converting the second image parameter of the panel to be detected from low bit depth to high bit depth by using a first function to obtain a third image parameter of the panel to be detected;
and acquiring gray scale voltages corresponding to the sub-pixels of the panel to be detected according to the third image parameters of the panel to be detected.
2. The white balance adjustment method according to claim 1, wherein the step of obtaining the white balance compensation coefficient of the panel under test according to the first image parameter of the panel under test comprises:
obtaining the brightness value L of the R sub-pixel of the panel to be tested at the Mth gray scaleRLuminance values L of (M) and G sub-pixelsGLuminance values L of (M) and B sub-pixelsB(M) and luminance value L of W sub-pixelW(M) and acquiring the brightness value L of the R sub-pixel of the panel to be detected in the nth gray scaleRLuminance values L of (n) and G sub-pixelsGLuminance values L of (n) and B sub-pixelsB(n) and the luminance value L of the W sub-pixelW(n)；
Obtaining the brightness L of a pixel when the panel to be detected is in a dark stateP；
Obtaining the correction coefficient b of the compensation coefficient of the panel to be measured which is 1- { (L)R(M)+LG(M)+LB(M)-2LP)/LW(M)}；
Obtaining the compensation coefficient a { (L) of the nth gray scale of the panel to be testedR(n)+LG(n)+LB(n)-2LP)/LW(n)}+b；
Wherein n is an integer of 0 to M.
3. The method of claim 1, further comprising, before obtaining the gray scale voltages corresponding to the sub-pixels of the panel under test:
and enabling the gamma value of the panel to be detected to be a first threshold value so as to obtain a first target brightness of the panel to be detected.
4. The method according to claim 3, wherein the step of obtaining the gray scale voltage corresponding to each sub-pixel of the panel to be tested according to the third image parameter of the panel to be tested comprises:
acquiring the brightness value of a first sub-pixel in the RGB sub-pixels corresponding to each gray scale according to the first target brightness of the panel to be detected;
acquiring the brightness values of the second sub-pixel and the third sub-pixel corresponding to the gray scales according to the brightness value of the first sub-pixel corresponding to the gray scales and the third image parameter of the panel to be detected;
acquiring gray scale voltages corresponding to the gray scales of the first sub-pixel, the second sub-pixel and the third sub-pixel according to the brightness values corresponding to the gray scales of the first sub-pixel, the second sub-pixel and the third sub-pixel;
wherein the first sub-pixel, the second sub-pixel, and the third sub-pixel are different ones of an R sub-pixel, a G sub-pixel, and a B sub-pixel.
5. A white balance adjusting device is characterized by comprising an acquisition module, a compensation module, an image parameter calculation module, a bit depth conversion module and an adjusting module;
the acquisition module is used for acquiring a first part of a panel to be detectedAn image parameter, wherein the first image parameter is a brightness value L of the R sub-pixel of the panel to be tested at the ith gray scaleR(i) G sub-pixel brightness value LG(i) Luminance value L of B sub-pixelB(i) And the luminance value L of the W sub-pixelW(i) Wherein i is an integer of 0 to M;
the compensation module is used for acquiring a white balance compensation coefficient of the panel to be detected according to the first image parameter of the panel to be detected;
the image parameter calculation module is used for acquiring a second image parameter of the panel to be detected according to the ratio of the first image parameter of the panel to be detected to the white balance compensation coefficient;
the bit depth conversion module is used for converting the second image parameter of the panel to be detected from low bit depth to high bit depth by using a first function so as to obtain a third image parameter of the panel to be detected;
the adjusting module is used for acquiring the gray scale voltage corresponding to each sub-pixel of the panel to be detected according to the third image parameter of the panel to be detected.
6. The white balance adjustment device according to claim 5, wherein the acquisition module includes a scanning unit and a luminance acquisition unit;
the scanning unit is used for scanning the panel to be detected;
the brightness acquisition unit is used for acquiring the brightness value L of the R sub-pixel of the panel to be detected in the ith gray scaleR(i) G sub-pixel brightness value LG(i) Luminance value L of B sub-pixelB(i) And the luminance value L of the W sub-pixelW(i) Wherein i is an integer of 0 to M.
7. The white balance adjustment device according to claim 6, wherein the compensation module includes a first obtaining unit, a dark state luminance calculating unit, a correcting unit, and a compensating unit;
the first acquisition unit is used for acquiring the brightness value L of the R sub-pixel of the panel to be detected in the Mth gray scaleRLuminance values L of (M) and G sub-pixelsGLuminance values L of (M) and B sub-pixelsB(M) and luminance value L of W sub-pixelW(M) and acquiring the brightness value L of the R sub-pixel of the panel to be detected in the nth gray scaleRLuminance values L of (n) and G sub-pixelsGLuminance values L of (n) and B sub-pixelsB(n) and the luminance value L of the W sub-pixelW(n)；
The dark state brightness calculation unit is used for acquiring the brightness L of one pixel when the panel to be detected is in a dark stateP；
The correction unit is used for obtaining a correction coefficient b ═ 1- { (L) of the compensation coefficient of the panel to be measuredR(M)+LG(M)+LB(M)-2LP)/LW(M)}；
The compensation unit is used for acquiring a compensation coefficient a { (L) of the nth gray scale of the panel to be testedR(n)+LG(n)+LB(n)-2LP)/LW(n)}+b；
Wherein n is an integer of 0 to M.
8. The white balance adjustment device according to claim 5, characterized in that the white balance adjustment device further comprises a target luminance calculation module;
the target brightness calculation module is used for enabling the gamma value of the panel to be detected to be a first threshold value so as to obtain the target brightness of the panel to be detected.
9. The white balance adjustment device according to claim 8, wherein the adjustment module includes a first calculation unit, a second calculation unit, and a third calculation unit;
the first computing unit is used for acquiring the brightness value of a first sub-pixel in the RGB sub-pixels corresponding to each gray scale according to the target brightness of the panel to be detected;
the second calculating unit is used for acquiring the brightness values of the second sub-pixel and the third sub-pixel at each gray scale according to the brightness value of the first sub-pixel at each gray scale and the third image parameter of the panel to be detected;
the third calculating unit is used for acquiring gray scale voltages corresponding to the gray scales of the first sub-pixel, the second sub-pixel and the third sub-pixel according to the brightness values corresponding to the gray scales of the first sub-pixel, the second sub-pixel and the third sub-pixel;
wherein the first sub-pixel, the second sub-pixel, and the third sub-pixel are different ones of an R sub-pixel, a G sub-pixel, and a B sub-pixel.
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