CN108932936B - Gray scale brightness adjusting method and display device - Google Patents
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
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- G09G2320/00—Control of display operating conditions
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- G09G2320/00—Control of display operating conditions
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Abstract
The invention provides a gray scale brightness adjusting method and a display device, wherein the gray scale brightness adjusting method comprises the following steps: acquiring a tristimulus value corresponding to an ambient light source; converting the tristimulus values of the ambient light source into RGB gray scale values; and dynamically adjusting the input gray scale value of the display device according to the ratio of the RGB gray scale value to the maximum gray scale value to obtain the output gray scale value of the display device, thereby realizing automatic adjustment of the display color temperature of the display device and avoiding the phenomenon of incompatibility with the ambient color temperature.
Description
Technical Field
The invention relates to the technical field of gray scale brightness adjustment, in particular to a gray scale brightness adjustment method and a display device.
Background
The display picture of the display device is composed of a plurality of pixels, each pixel comprises three sub-pixels of red, green and blue, the brightness of each sub-pixel can be controlled by inputting the brightness information of the three sub-pixels, namely RGB gray-scale values, and each pixel can present different colors and brightness by mixing the three sub-pixels.
The color temperature of the ambient light source and the display color temperature of the display device directly affect the experience of the viewer. The existing color temperature adjusting methods generally include two methods, one is that a viewer manually adjusts the display color temperature of the display device according to the use feeling of the viewer, and the adjusting method has a small range and low adjusting precision; the other is to adjust the display color temperature of the display device according to the brightness of the ambient light source, for example, when the ambient light source is a warm light, if the display effect of the display device is a high color temperature, the viewer is likely to feel that the picture is bright and the display color is blue; on the contrary, when the ambient light source is a cold white light, if the display effect is a low color temperature, the viewer is likely to feel that the picture is darker and the display color is redder; both of them exhibit the phenomenon of incompatibility with the ambient color temperature.
Disclosure of Invention
In order to solve the above problems, the present invention provides a gray scale brightness adjusting system and a display device, which can dynamically adjust the display color temperature of the display device according to the color temperature of an ambient light source, thereby achieving automatic color temperature adjustment without causing incompatibility with the ambient color temperature.
The specific technical scheme provided by the invention is as follows: provided is a gray scale brightness adjusting method, comprising the following steps:
acquiring tristimulus values (X, Y, Z) corresponding to an ambient light source;
converting the tristimulus values (X, Y, Z) of the ambient light source into RGB gray scale values (R, G, B);
according to the ratio of RGB gray-scale value (R, G, B) and maximum gray-scale value max to input gray-scale value (R) of display devicein,Gin,Bin) Dynamically adjusting to obtain output gray scale value (R) of the display deviceout,Gout,Bout) Wherein
further, the obtaining of the tristimulus values corresponding to the ambient light source specifically includes:
acquiring the color temperature of an ambient light source;
obtaining the brightness L of the ambient light source according to the color temperature of the ambient light sourcevAnd a corresponding chromaticity (x, y);
according to the brightness LvAnd calculating the tristimulus values (X, Y, Z) corresponding to the ambient light source by using the chromaticity (X, Y).
Further, the acquiring the color temperature of the ambient light source specifically includes: and sequentially acquiring the color temperatures of the ambient light sources according to a preset time period or sequentially acquiring the color temperatures of the ambient light sources according to a preset color temperature change threshold.
Further, according to the brightness LvAnd the formula for calculating the tristimulus value of the environment light source by the chromaticity (x, y) is as follows:
further, before obtaining the tristimulus value corresponding to the ambient light source, the adjusting method further includes:
obtaining the tristimulus value (X) of the black picture0,Y0,Z0)；
Obtaining the tristimulus value (X) of the red picture under the maximum gray scale valueR,YR,ZR)；
Obtaining the tristimulus value (X) of the green picture under the maximum gray scale valueG,YG,ZG)；
Obtain a blue pictureTristimulus value (X) at maximum gray scale valueB,YB,ZB)。
Further, the step of converting the tristimulus values (X, Y, Z) of the ambient light source into RGB grayscale values (R, G, B) specifically includes:
normalizing the tristimulus values (X, Y, Z) of the ambient light source to obtain normalized tristimulus values (X ', Y ', Z ');
converting the normalized tristimulus values (X ', Y ', Z ') into RGB gray scale values (R, G, B).
Further, the tristimulus values of the ambient light source are normalized, and the formula for obtaining the normalized tristimulus values is as follows:
further, the formula for converting the normalized tristimulus values (X ', Y ', Z ') into normalized RGB grayscale values is:
wherein, γR' denotes the normalized gamma value, gamma, of the Red PictureG' denotes the normalized gamma value, gamma, of the Green PictureB' denotes the normalized gamma value for the blue picture.
Further, γR′、γG′、γB' is obtained by the following formula:
wherein,
γRgamma value, gamma, representing a red pictureGGamma value, gamma, representing a green pictureBThe gamma value of the blue picture is shown.
The present invention also provides a display apparatus comprising a memory and a processor, the memory having stored therein a plurality of instructions adapted to be loaded and executed by the processor:
acquiring tristimulus values (X, Y, Z) corresponding to an ambient light source;
converting the tristimulus values (X, Y, Z) of the ambient light source into RGB gray scale values (R, G, B);
according to the ratio of RGB gray-scale value (R, G, B) and maximum gray-scale value max to input gray-scale value (R) of display devicein,Gin,Bin) Dynamically adjusting to obtain output gray scale value (R) of the display deviceout,Gout,Bout) Wherein
the gray scale brightness adjusting method provided by the invention converts the tristimulus values of the ambient light source into RGB gray scale values by acquiring the tristimulus values of the ambient light source; and dynamically adjusting the input gray scale value of the display device according to the ratio of the RGB gray scale value to the maximum gray scale value to obtain the output gray scale value of the display device, thereby realizing automatic adjustment of the display color temperature of the display device and avoiding the phenomenon of incompatibility with the ambient color temperature.
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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.
FIG. 1 is a flow chart of a method for adjusting gray scale brightness;
FIG. 2 is a schematic diagram of a gray scale brightness adjustment system;
FIG. 3 is a diagram of a memory and a processor.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. Rather, these embodiments are provided to explain the principles of the invention and its practical application to thereby enable others skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use contemplated. In the drawings, like reference numerals will be used to refer to like elements throughout.
Referring to fig. 1, the display device in the present embodiment includes a plurality of pixels, each including a red sub-pixel (R), a green sub-pixel (G), and a blue sub-pixel (B). The maximum gray scale number of the display device is n, wherein n is more than or equal to 0 and less than or equal to 255, 0 represents the minimum gray scale of the display device, 255 represents the maximum gray scale of the display device, when the gray scale values of the red sub-pixel (R), the green sub-pixel (G) and the blue sub-pixel (B) are all 0, the display device displays black, and when the gray scale values of the red sub-pixel (R), the green sub-pixel (G) and the blue sub-pixel (B) are all 255, the display device displays white. The method for adjusting gray-scale brightness is described in detail below, and comprises the following steps:
s1, acquiring tristimulus values (X, Y, Z) corresponding to the ambient light source;
s2, converting the tristimulus values (X, Y, Z) of the environment light source into RGB gray-scale values (R, G, B);
s3, inputting gray scale value (R) of the display device according to the ratio of RGB gray scale value (R, G, B) and maximum gray scale value maxin,Gin,Bin) Dynamically adjusting to obtain output gray scale value (R) of the display deviceout,Gout,Bout) Wherein
the ambient light source in this embodiment refers to an illumination lamp in the environment where the display device is located. Converting the tristimulus values of the ambient light source into RGB gray scale values by acquiring the tristimulus values of the ambient light source; and dynamically adjusting the input gray scale value of the display device according to the ratio of the RGB gray scale value to the maximum gray scale value to obtain the output gray scale value of the display device, so as to realize automatic adjustment of the display color temperature of the display device.
Specifically, step S1 includes:
s11, acquiring the color temperature of the ambient light source;
s12, obtaining the brightness L of the environment light source according to the color temperature of the environment light sourcevAnd a corresponding chromaticity (x, y);
s13, according to the brightness LvAnd calculating the tristimulus values (X, Y, Z) corresponding to the ambient light source by using the chromaticity (X, Y).
The color temperature of the ambient light source can be measured by the measuring instrument, and each color temperature corresponds to the corresponding brightness LvAnd chromaticity (x, y), so that obtaining the color temperature of the ambient light source allows the luminance L of the ambient light source to be determined from the color temperaturevAnd chroma (x, y). Then, calculating the tristimulus values (X, Y, Z) corresponding to the environment light source according to the following formula:
preferably, in step S11, in order to avoid detecting the color temperature of the ambient light source too frequently, in this embodiment, the color temperature of the ambient light source may be sequentially obtained according to a preset time period T, that is, the first time the measurement time of the color temperature of the ambient light source is T, and the color temperature of the ambient light source is measured again after the interval time T, that is, the measurement is performed at times T + T, T +2T, T +3T and … …. The color temperature of the ambient light source is sequentially acquired according to the preset time period, so that the phenomenon of obvious color temperature switching cannot be generated while real-time adjustment is realized.
In step S11, the color temperature of the ambient light source may also be sequentially obtained according to the preset color temperature change threshold Δ u, that is, the color temperature of the ambient light source is u for the first time, and the color temperature change reaches the color temperature change threshold Δ u, and then the color temperature of the ambient light source is measured again, where the color temperature change may be a positive change or a negative change, that is, the color temperature of the ambient light source is u + Δu or u- Δ u, where the color temperature of the ambient light source is sequentially obtained according to the preset temperature change threshold, and the change amount of the ambient color temperature is also understood to be proportional to the measurement frequency of the color temperature of the ambient light source, that is, the color temperature change amplitude of the ambient light source is large, the number of times of measuring the color temperature of the ambient light source increases, the number of times of measuring the color temperature of the ambient light source decreases, and the number of times. The color temperature of the environment light source is sequentially acquired according to the preset color temperature change threshold value, so that the phenomenon of obvious color temperature switching cannot be generated while real-time adjustment is realized, and whether color temperature measurement is carried out or not can be determined according to the change range of the color temperature according to the color temperature of the preset color temperature change threshold value, so that the automatic adjustment is more intelligent.
Before step S1, the adjusting method in this embodiment further includes:
s10, obtaining the tristimulus value (X) of the black picture of the display device0,Y0,Z0) (ii) a Acquiring the tristimulus value (X) of the red picture of the display device under the maximum gray scale valueR,YR,ZR) (ii) a Acquiring the tristimulus value (X) of the green picture of the display device under the maximum gray scale valueG,YG,ZG) (ii) a Acquiring tristimulus value (X) of blue picture of display device under maximum gray scale valueB,YB,ZB). These parameters are obtained when a performance test is performed on the display device, wherein the maximum gray scale of the display device in this embodiment is 255, that is, max is 255, (X)R,YR,ZR)、(XG,YG,ZG)、(XB,YB,ZB) Are tristimulus values at 255 gray levels.
Preferably, step S2 includes:
s21, carrying out normalization processing on the tristimulus values (X, Y, Z) of the ambient light source to obtain normalized tristimulus values (X ', Y ', Z ');
s22, converting the normalized tristimulus values (X ', Y ', Z ') into RGB gray-scale values (R, G, B).
In step S2, the maximum effective gray scale value of the display device is obtained by performing normalization processing on the tristimulus values (X, Y, Z) of the ambient light source, so as to avoid that the maximum effective gray scale value exceeds the display color gamut of the display device due to being too large or the maximum effective gray scale value is smaller, thereby reducing the display brightness of the display device and improving the display effect of the display device.
In step S21, the tristimulus values (X, Y, Z) of the ambient light source are normalized, and the formula for obtaining the normalized tristimulus values is as follows:
wherein,
the inverse matrix is represented by subtracting the tristimulus value of the black frame from the tristimulus value of the red frame at the maximum gray level value, subtracting the tristimulus value of the black frame from the tristimulus value of the green frame at the maximum gray level value, and subtracting the tristimulus value of the black frame from the tristimulus value of the blue frame at the maximum gray level value. Since the display device can generate light leakage phenomenon when displaying black picture, the light leakage effect under the black picture in the display device can be eliminated by subtracting the tristimulus value of the black picture.
In step S22, the formula for converting the normalized tristimulus values (X ', Y ', Z ') into RGB grayscale values (R, G, B) is:
obtaining after conversion:
in the above formula, γR' denotes the normalized gamma value, gamma, of the Red PictureG' denotes the normalized gamma value, gamma, of the Green PictureB' denotes the normalized gamma value for the blue picture. Gamma rayR′、γG′、γB' TongObtained by the following formula:
wherein,
γRgamma value, gamma, representing a red pictureGGamma value, gamma, representing a green pictureBThe gamma value of the blue picture is shown. For example, the gamma value of red frame, the gamma value of green frame, and the gamma value of blue frame are γR＝0.9、γG＝0.8、γBWhen the value is equal to 0.7, then
Corresponding gammaR′、γG′、γB' is:
after the RGB gray-scale values (R, G, B) are obtained, the following formula can be obtained:
obtaining an output gray scale value (R) of the display deviceout,Gout,Bout)。
Referring to fig. 2, the present embodiment further provides a gray-scale brightness adjusting system, which includes an obtaining unit 1, a converting unit 2, and an adjusting unit 3.
The obtaining unit 1 is configured to obtain tristimulus values (X, Y, Z) corresponding to the ambient light source, the converting unit 2 is configured to convert the tristimulus values (X, Y, Z) of the ambient light source into RGB grayscale values (R, G, B), and the adjusting unit 3 is configured to adjust an input grayscale value (R) of the display device according to a ratio of the RGB grayscale values (R, G, B) to the maximum grayscale value maxin,Gin,Bin) Dynamically adjusting to obtain output gray scale value (R) of the display deviceout,Gout,Bout) Wherein
the obtaining unit 1 in this embodiment is specifically configured to obtain a color temperature of the ambient light source, and then obtain a brightness L of the ambient light source according to the color temperature of the ambient light sourcevAnd corresponding chromaticity (x, y), finally according to luminance LvAnd calculating the tristimulus values (X, Y, Z) corresponding to the ambient light source by using the chromaticity (X, Y).
The conversion unit 2 is specifically configured to perform normalization processing on the tristimulus values (X, Y, Z) of the ambient light source to obtain normalized tristimulus values (X ', Y', Z '), and then convert the normalized tristimulus values (X', Y ', Z') into RGB grayscale values (R, G, B).
Referring to fig. 3, the present embodiment also provides a display device including a memory 10 and a processor 20. The memory 10 has stored therein a plurality of instructions adapted to be loaded and executed by the processor 20:
acquiring tristimulus values (X, Y, Z) corresponding to an ambient light source;
converting the tristimulus values (X, Y, Z) of the ambient light source into RGB gray scale values (R, G, B);
according to the ratio of RGB gray-scale value (R, G, B) and maximum gray-scale value max to input gray-scale value (R) of display devicein,Gin,Bin) Dynamically adjusting to obtain output gray scale value (R) of the display deviceout,Gout,Bout) Wherein
the foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
Claims (8)
1. A method for adjusting gray scale brightness, the method comprising the steps of:
acquiring tristimulus values (X, Y, Z) corresponding to an ambient light source;
normalizing the tristimulus values (X, Y, Z) of the ambient light source to make the normalized color gamut be located in the color gamut of the display device, and obtaining normalized tristimulus values (X ', Y', Z '), wherein the formula for obtaining the normalized tristimulus values (X', Y ', Z') is as follows:
converting the normalized tristimulus values (X ', Y ', Z ') into RGB gray scale values (R, G, B);
according to the ratio of RGB gray-scale value (R, G, B) and maximum gray-scale value max to input gray-scale value (R) of display devicein,Gin,Bin) Dynamically adjusting to obtain output gray scale value (R) of the display deviceout,Gout,Bout)。
2. The adjusting method according to claim 1, wherein the obtaining of the tristimulus value corresponding to the ambient light source specifically comprises:
acquiring the color temperature of an ambient light source;
obtaining the brightness L of the ambient light source according to the color temperature of the ambient light sourcevAnd a corresponding chromaticity (x, y);
according to the brightness LvAnd calculating the tristimulus values (X, Y, Z) corresponding to the ambient light source by using the chromaticity (X, Y).
3. The adjusting method of claim 2, wherein obtaining the color temperature of the ambient light source specifically comprises: and sequentially acquiring the color temperatures of the ambient light sources according to a preset time period or sequentially acquiring the color temperatures of the ambient light sources according to a preset color temperature change threshold.
4. The adjustment method according to claim 2, characterized in that it is dependent on said luminance LvAnd the formula for calculating the tristimulus value of the environment light source by the chromaticity (x, y) is as follows:
5. the adjusting method according to claim 1, wherein before obtaining the tristimulus value corresponding to the ambient light source, the adjusting method further comprises:
obtaining the tristimulus value (X) of the black picture0,Y0,Z0)；
Obtaining the tristimulus value (X) of the red picture under the maximum gray scale valueR,YR,ZR)；
Obtaining the tristimulus value (X) of the green picture under the maximum gray scale valueG,YG,ZG)；
Obtaining the tristimulus value (X) of the blue picture under the maximum gray scale valueB,YB,ZB)。
6. Method for conditioning according to claim 5, characterized in that said normalized tristimulus values (X ', Y ', Z ') are transformed into RGB gray-scale values (R, G, B) by the formula:
wherein, γRGamma value, gamma, representing a red pictureGGamma value, gamma, representing a green pictureBThe gamma value of the blue picture is shown.
7. Adjustment method according to claim 5, characterized in that the input gray level (R) of the display device is adjusted according to the ratio of the RGB gray level (R, G, B) to the maximum gray level maxin,Gin,Bin) Dynamically adjusting to obtain output gray scale value (R) of the display deviceout,Gout,Bout) The formula used is:
8. a display device comprising a memory and a processor, the memory having stored therein a plurality of instructions adapted to be loaded by the processor and to perform:
acquiring tristimulus values (X, Y, Z) corresponding to an ambient light source;
normalizing the tristimulus values (X, Y, Z) of the ambient light source to make the normalized color gamut be located in the color gamut of the display device, and obtaining normalized tristimulus values (X ', Y', Z '), wherein the formula for obtaining the normalized tristimulus values (X', Y ', Z') is as follows:
converting the normalized tristimulus values (X ', Y ', Z ') into RGB gray scale values (R, G, B);
according to the ratio of RGB gray-scale value (R, G, B) and maximum gray-scale value max to input gray-scale value (R) of display devicein,Gin,Bin) Dynamically adjusting to obtain output gray scale value (R) of the display deviceout,Gout,Bout)。
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