CN105138185B - Display screen parameter calibrating method and device - Google Patents

Display screen parameter calibrating method and device Download PDF

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Publication number
CN105138185B
CN105138185B CN201510641513.5A CN201510641513A CN105138185B CN 105138185 B CN105138185 B CN 105138185B CN 201510641513 A CN201510641513 A CN 201510641513A CN 105138185 B CN105138185 B CN 105138185B
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gamma
parameter
gray
key point
display screen
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CN105138185A (en
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王睿文
倪漫利
邹少林
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Shenzhen Tinno Wireless Technology Co Ltd
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Shenzhen Tinno Wireless Technology Co Ltd
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  • Controls And Circuits For Display Device (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The present invention provides a kind of display screen parameter calibrating method and device.Display screen parameter calibrating method of the invention, comprising: according to the parameter of adjustable key point, obtain the Gamma function of display screen;The Gamma function is adjusted according to target Gamma parameter, so that the value of the Gamma function is equal to the target Gamma parameter.Display screen parametric calibration device of the invention, including obtain module and adjustment module.Using technical solution of the present invention, may be implemented to reach optimal ideal gamma curve according to the parameter adjust automatically gamma curve of adjustable key point, adjustment effect is good, while largely saving debug time and cost of labor.

Description

Display screen parameter calibrating method and device
Technical field
The present invention relates to display screen technology field more particularly to a kind of display screen parameter calibrating methods and device.
Background technique
Gradually substitution with electronical display mode to display modes such as traditionally on paper becomes the important of all trades and professions application Product.Wherein, liquid crystal display (liquid crystal display;LCD mainstream image output products) are used as, are widely applied In the field that mobile terminal, computer, TV and camera etc. need image to export.
Each point on the LCD of people's finding of naked eye, i.e. a pixel are by three sub-pixels of red, green, blue (RGB) Composition.The light source of each sub-pixel, behind can show different gray scales.Since LCD is to RGB three Color electro-optical characteristic is inconsistent, and the color difference for showing as each grayscale is larger, needs to correct the color of each grayscale.Without The display equipment of gamma curve correction can make the color of reality output image, brightness generate deviation, it is therefore necessary to pass through correction Gamma shows the display effect of image to improve.
In the prior art, the mode of manual debugging gamma curve is generallyd use to be adjusted to LCD, each grayscale point It is all to carry out judging best image value by naked eyes, the curve after this procedure regulation has compared with optimal ideal curve Certain error.
Summary of the invention
The present invention provides a kind of display screen parameter calibrating method and device, to solve to generally use artificial in the prior art The mode for debugging gamma curve is adjusted LCD, the gamma curve after this procedure regulation and optimal ideal Gamma curve, which is compared, the problem of certain error.
The present invention provides a kind of display screen parameter calibrating method, comprising:
According to the parameter of adjustable key point, the Gamma function of display screen is obtained;
The Gamma function is adjusted according to target Gamma parameter, so that the value of the Gamma function is equal to the target Gamma parameter.
Further, in method described above, the parameter according to adjustable key point obtains the Gamma of display screen Function specifically includes:
Count the gray number of each adjustable key point;
Calculate the gray-scale intensity of each adjustable key point;
According to the gray number of each adjustable key point and the gray-scale intensity, the institute of the display screen is obtained State Gamma function.
Further, in method described above, according to the gray number of each adjustable key point and described Gray-scale intensity, before the Gamma function for obtaining display screen, the method also includes:
Determine the priority of each adjustable key point;
Further, according to the gray number of each adjustable key point and the gray-scale intensity, described in acquisition The Gamma function of display screen, specifically includes:
According to the gray number, the gray-scale intensity and the priority of each adjustable key point, institute is obtained State the Gamma function of display screen.
Further, in method described above, the gray-scale intensity using register parameters and positive-negative polarity parameter come Characterization.
Further, described that the Gamma function is adjusted according to target Gamma parameter in method described above, so that The value of the Gamma function is equal to the target Gamma parameter, specifically includes:
According to the target Gamma parameter and the gray number, adjusts the gray-scale intensity and make the Gamma function Value be equal to the target Gamma parameter;
Further, according to the target Gamma parameter and the gray number, adjust the gray-scale intensity make it is described The value of Gamma function is equal to the target Gamma parameter, specifically includes: according to the target Gamma parameter and the grayscale Number, adjusts the register parameters and the positive-negative polarity parameter, so that the value of the Gamma function is equal to the target Gamma parameter.
The present invention also provides a kind of display screen parametric calibration devices, comprising:
It obtains module and obtains the Gamma function of display screen for the parameter according to adjustable key point;
Module is adjusted, for adjusting the Gamma function according to target Gamma parameter, so that the value of the Gamma function Equal to the target Gamma parameter.
Further, in device described above, the acquisition module is specifically included:
Statistic unit, for counting the gray number of each adjustable key point;
Computing unit, for calculating the gray-scale intensity of each adjustable key point;
Acquiring unit, for according to each adjustable key point the gray number and the gray-scale intensity, obtain The Gamma function of the display screen.
Further, in device described above, the acquisition module further include:
Determination unit, for determining the priority of each adjustable key point;
Further, the acquisition module, specifically for according to the gray number of each adjustable key point, described Gray-scale intensity and the priority obtain the Gamma function of the display screen.
Further, in device described above, the gray-scale intensity using register parameters and positive-negative polarity parameter come Characterization.
Further, in device described above, the adjustment module is specifically used for according to the target Gamma parameter And the gray number, it adjusts the gray-scale intensity and the value of the Gamma function is made to be equal to the target Gamma parameter;
Further, the adjustment module is specifically used for being adjusted according to the target Gamma parameter and the gray number The whole register parameters and the positive-negative polarity parameter, so that the value of the Gamma function is joined equal to the target Gamma Number.
The display screen of the invention parameter calibrating method and device obtain display screen by the parameter according to adjustable key point Gamma function adjusts Gamma function according to target Gamma parameter, so that the value of Gamma function is equal to target Gamma parameter, To solve to generally use the mode of manual debugging gamma curve to be adjusted LCD, by this process tune in the prior art Gamma curve after section has the problem of certain error compared with optimal ideal gamma curve, realizes according to adjustable key The parameter adjust automatically gamma curve of point reaches optimal ideal gamma curve, and adjustment effect is good, while very big journey Debug time and cost of labor are saved on degree.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair Bright some embodiments for those of ordinary skill in the art without any creative labor, can be with It obtains other drawings based on these drawings.
Fig. 1 is the flow chart of the display screen of the invention parameter calibrating method embodiment one;
Fig. 2 is the flow chart of the display screen of the invention parameter calibrating method embodiment two;
Fig. 3 is the flow chart of the display screen of the invention parameter calibrating method embodiment three;
Fig. 4 is the structural schematic diagram of the display screen of the invention parametric calibration Installation practice one;
Fig. 5 is the structural schematic diagram of the display screen of the invention parametric calibration Installation practice two;
Fig. 6 is the structural schematic diagram of the display screen of the invention parametric calibration Installation practice three;
Fig. 7 is the Gamma function curve schematic diagram that display screen parametric calibration device of the invention adjusts.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Fig. 1 is the flow chart of the display screen of the invention parameter calibrating method embodiment one, as shown in Figure 1, the present embodiment is aobvious Display screen parameter calibrating method, can specifically include following steps:
101, according to the parameter of adjustable key point, the Gamma function of display screen is obtained;
Specifically, different LCD requires to be debugged accordingly after the completion of production, to obtain optimal display effect Fruit.Due to different LCD, its drive integrated circult is also different, in debugging process, if choosing each be adjusted Adjustable key point obtains the Gamma function of unjustified each adjustable key point according to the parameter of these adjustable key points.
102, Gamma function is adjusted according to target Gamma parameter, so that the value of Gamma function is joined equal to target Gamma Number.
Specifically, the optimal Gamma function of its display effect of different LCD is target Gamma function, it is generally the case that Optimal Gamma function is the Gamma function that index value is 2.2, and the best Gamma function in the present embodiment also can be set as Other numerical value do not do specific restriction herein.According to target Gamma function come to unjustified each adjustable key point Gamma function is adjusted, so that the index value of the Gamma function after being adjusted is equal to the index value of best Gamma function, I.e. the value of Gamma function is equal to target Gamma parameter.
The display screen parameter calibrating method of the present embodiment obtains the Gamma of LCD by the parameter according to adjustable key point Function adjusts Gamma function according to target Gamma parameter, so that the value of Gamma function is equal to target Gamma parameter, to solve In the prior art, the mode of manual debugging gamma curve is generallyd use to be adjusted to LCD, after this procedure regulation Gamma curve has the problem of certain error compared with optimal ideal gamma curve, realizes the ginseng according to adjustable key point Number adjust automatically gamma curve reaches optimal ideal gamma curve, and adjustment effect is good, while largely saving About debug time and cost of labor.
Fig. 2 is the flow chart of the display screen of the invention parameter calibrating method embodiment two, as shown in Fig. 2, the present embodiment is aobvious Display screen parameter calibrating method is to be described in further detail on the basis of example 1, can specifically include following steps:
201, the gray number of each adjustable key point is counted;
Specifically, each adjustable key point of LCD has corresponding parameter, and gray number is one of parameter, according to LCD In control integrated circuit in design, count the gray number of each adjustable key point.
202, the gray-scale intensity of each adjustable key point is calculated;
Specifically, according to the key between grayscale and brightness, the gray-scale intensity of each adjustable key point is calculated.
203, according to the gray number and gray-scale intensity of each adjustable key point, the Gamma function of display screen is obtained;
Specifically, it is obtained in display screen by two parameters (gray number and gray-scale intensity) of each adjustable key point The Gamma function of each key point.In practical application, each adjustable key point of different display screens may be different, corresponding each The parameter of a adjustable key point also can be different, and therefore, the Gamma function of each key point also can be different in the display screen of acquisition.
204, Gamma function is adjusted according to target Gamma parameter, so that the value of Gamma function is joined equal to target Gamma Number.
Specifically, by taking target Gamma parameter, that is, index value is 2.2 as an example, an adjustable key point is chosen, according to its grayscale It is several to come with gray-scale intensity, the Gamma functional value of the adjustable key point is obtained, is stored in accordingly by adjusting the adjustable key point Data in register, so that the index value of the Gamma function of the adjustable key point is equal to 2.2.
The display screen parameter calibrating method of the present embodiment is obtained by the gray number and gray-scale intensity according to adjustable key point The Gamma function for taking display screen adjusts Gamma function according to target Gamma parameter, so that the value of Gamma function is equal to target Gamma parameter, to solve to generally use the mode of manual debugging gamma curve to be in the prior art adjusted LCD, pass through Gamma curve after crossing this procedure regulation has the problem of certain error compared with optimal ideal gamma curve, realizes root Optimal ideal gamma curve is reached according to the parameter adjust automatically gamma curve of adjustable key point, adjustment effect is good, Debug time and cost of labor are largely saved simultaneously.
Fig. 3 is the flow chart of the display screen of the invention parameter calibrating method embodiment three, as shown in figure 3, the present embodiment is aobvious Display screen parameter calibrating method is to be described in further detail on the basis of example 2, can specifically include following steps:
301, the gray number of each adjustable key point is counted;
302, the gray-scale intensity of each adjustable key point is calculated;
303, the priority of each adjustable key point is determined;
Specifically, it is different according to the control IC design in different LCD, it is generally the case that if main line electricity can be chosen Pressure is used as Vital Voltage, and then pressing key to continue to divide by fixed resistance string makes it respectively expand to required circuit In.Choosing Vital Voltage is adjustable key point, and the greyscale level of each adjustable key point may be different, when adjustment need by Each adjustable key point carries out grade classification, for example, level-one, second level and three-level, when adjustment is adjusted according to the grade of division Whole, grade is that the corresponding adjustable key point of level-one is the point adjusted at first.
304, according to gray number, gray-scale intensity and the priority of each adjustable key point, the Gamma letter of display screen is obtained Number;
Further, according to the gray number and gray-scale intensity of each adjustable key point, the Gamma letter of display screen is obtained Number, specifically includes: according to gray number, gray-scale intensity and the priority of each adjustable key point, obtaining the Gamma letter of display screen Number.Wherein, gray-scale intensity is characterized using register parameters and positive-negative polarity parameter, each gray-scale intensity is corresponding with positive and negative anodes Two registers, register parameters are the data that can be adjusted in adjustable key point.
305, it according to target Gamma parameter and gray number, adjusts gray-scale intensity and the value of Gamma function is made to be equal to target Gamma parameter.
Further, according to target Gamma parameter and gray number, the value etc. that gray-scale intensity makes Gamma function is adjusted It in target Gamma parameter, specifically includes: according to target Gamma parameter and gray number, adjusting register parameters and positive-negative polarity Parameter, so that the value of Gamma function is equal to target Gamma parameter.Adjust the register parameters of each adjustable key point with it is positive and negative Polarity parameters generally use while adjusting two registers of corresponding positive and negative anodes, while adjustment can be while increase while subtract It is small or complementary.
The display screen parameter calibrating method of the present embodiment, by according to the gray number of adjustable key point, gray-scale intensity and Priority obtains the Gamma function of display screen, Gamma function is adjusted according to target Gamma parameter, so that the value of Gamma function Equal to target Gamma parameter, to carry out LCD to solve to generally use the mode of manual debugging gamma curve in the prior art Adjustment, the gamma curve after this procedure regulation have the problem of certain error compared with optimal ideal gamma curve, The register parameters and positive-negative polarity parameter according to adjustable key point are realized, adjust automatically gamma curve reaches most preferably Ideal gamma curve, adjustment effect is good, while largely saving debug time and cost of labor, using this implementation The display screen parameter calibrating method of example can be very good to be compatible with to the different designs for saying my LCD control integrated circuit.
Those of ordinary skill in the art will appreciate that: realize that all or part of the steps of above-mentioned each method embodiment can lead to The relevant hardware of program instruction is crossed to complete.Program above-mentioned can be stored in a computer readable storage medium.The journey When being executed, execution includes the steps that above-mentioned each method embodiment to sequence;And storage medium above-mentioned include: ROM, RAM, magnetic disk or The various media that can store program code such as person's CD.
Fig. 4 is the structural schematic diagram of the display screen of the invention parametric calibration Installation practice one, as shown in figure 4, the present embodiment Display screen parametric calibration device may include: to obtain module 11 and adjustment module 12, wherein obtain module 11 and be used for according to can The parameter for adjusting key point, obtains the Gamma function of display screen;Adjustment module 12 is connect with module 11 is obtained, the adjustment module 12 For adjusting the Gamma function for obtaining the display screen that module 11 obtains according to target Gamma parameter, so that the value of Gamma function Equal to target Gamma parameter.
The display screen parametric calibration device of the present embodiment, can be used for executing the technical solution of embodiment of the method shown in Fig. 1, That the realization principle and technical effect are similar is similar for it, and details are not described herein again.
Fig. 5 is the structural schematic diagram of the display screen of the invention parametric calibration Installation practice two, as shown in figure 5, the present embodiment Display screen parametric calibration device display screen parametric calibration apparatus structure shown in Fig. 4 on the basis of, further, obtain module 11 may include: statistic unit 111, for counting the gray number of each adjustable key point;Computing unit 112, it is each for calculating The gray-scale intensity of a adjustable key point;Acquiring unit 113 is connect with statistic unit 111 and computing unit 112 respectively, the acquisition list Gray number and computing unit 112 of the member 113 for being counted according to the statistic unit 111 of each adjustable key point are calculated Gray-scale intensity obtains the Gamma function of display screen.Acquiring unit 113 is also connect with adjustment module 12, and adjustment module 12 will acquire The parameter for the Gamma function that unit 12 obtains is adjusted, so that the value of Gamma function is equal to target Gamma parameter.
The display screen parametric calibration device of the present embodiment, can be used for executing the technical solution of embodiment of the method shown in Fig. 2, That the realization principle and technical effect are similar is similar for it, and details are not described herein again.
Fig. 6 is the structural schematic diagram of the display screen of the invention parametric calibration Installation practice three, as shown in fig. 6, the present embodiment Display screen parametric calibration device display screen parametric calibration apparatus structure shown in Fig. 5 on the basis of, further, obtain module 11 can also include determination unit 114, and determination unit 114 is connect with acquiring unit 113, and the determination unit 114 is each for determining The priority of a adjustable key point;Further, module 11 is obtained specifically for the gray number according to each adjustable key point, ash Rank brightness and priority obtain the Gamma function of display screen, and wherein gray number show that grayscale is bright by the statistics of statistic unit 111 Degree is calculated by computing unit 112, and priority is determined by determination unit 114.
In addition, gray-scale intensity is characterized using register parameters and positive-negative polarity parameter.Each adjustable key point has two A opposite polarity register parameters correspond, i.e. the register parameters of positive register parameters and cathode.
Further, adjustment module 12 is connect with statistic unit 111, which is specifically used for according to target The gray number that Gamma parameter and statistic unit 111 count, adjustment gray-scale intensity make the value of Gamma function be equal to target Gamma parameter.
Further, adjustment module 12 is specifically used for adjusting register parameters according to target Gamma parameter and gray number With positive-negative polarity parameter so that the value of Gamma function be equal to target Gamma parameter.
The display screen parametric calibration device of the present embodiment, can be used for executing the technical solution of embodiment of the method shown in Fig. 3, That the realization principle and technical effect are similar is similar for it, and details are not described herein again.
Fig. 7 is the Gamma function curve schematic diagram that display screen parametric calibration device of the invention adjusts.As shown in fig. 7, this The display screen parametric calibration device of invention specifically can be applied in such as computer terminal, carry out in the form of software using, with The drive integrated circult of certain liquid crystal display mould group, model are as follows: for OTM1284A, following data are inputted:
CMD 0X00
DAT 0X00
CMD 0XFF
DAT 0X12
DAT 0X84
DAT 0X01
CMD 0X00
DAT 0X80
CMD 0XFF
DAT 0X12
DAT 0X84
CMD 0X00
DAT 0X00
CMD 0XE1
PT1 0X00 255P-
PT1 0X10 253P-
PT1 0X17 251P-
PT3 0X1B 248P-
PT3 0X33 244P-
PT3 0X42 239P-
PT3 0X44 231P-
PT2 0X71 203P-
PT3 0X65 175P-
PT3 0X80 143P-
PT3 0X8B 112P+
PT3 0X70 080P+
PT2 0X80 052P+
PT3 0X5D 024P+
PT3 0X53 016P+
PT3 0X43 011P+
PT3 0X32 007P+
PT1 0X20 004P+
PT1 0X10 002P+
PT1 0X00 000P+
CMD 0X00
DAT 0X00
CMD 0XE2
NT1 0X00 255N-
NT1 0X10 253N-
NT1 0X17 251N-
NT3 0X1B 248N-
NT3 0X33 244N-
NT3 0X42 239N-
NT3 0X44 231N-
NT2 0X71 203N-
NT3 0X65 175N-
NT3 0X80 143N-
NT3 0X8B 112N+
NT3 0X70 080N+
NT2 0X80 052N+
NT3 0X5D 024N+
NT3 0X53 016N+
NT3 0X43 011N+
NT3 0X32 007N+
NT1 0X20 004N+
NT1 0X10 002N+
NT1 0X00 000N+
END
The data format of input in above-described embodiment are as follows: [PT/NT (priority)] [register parameters] [gray number] [just Negative polarity] [+/-], wherein PT indicates that positive polarity grayscale, NT indicate negative polarity grayscale, and 1 indicates that priority is 1,0X** expression pair Answer the register parameters of this grayscale, P indicates positive polarity, and N indicates negative polarity, and+indicate the value of register more bigger brighter ,-indicates The value of register is smaller brighter.According to the priority of adjustable key point, by adjusting corresponding register parameters, adjustable ash Rank brightness, so that the value of Gamma function is equal to target Gamma parameter.
After being adjusted, Gamma function curve is as shown in Figure 7, wherein and 1 is the curve that Gamma functional value is 1.9,2 The curve for being 2.5 for Gamma functional value, 3 be the curve that Gamma functional value is Gamma functional value adjusted, that is, is actually generated Gamma curve, 4 be the aim curve that Gamma functional value is 2.2.According to Fig. 7, it can be seen that Gamma function adjusted The aim curve 4 that the Gamma functional value of the curve 3 of value close to adjustment is 2.2.
The apparatus embodiments described above are merely exemplary, wherein unit can be as illustrated by the separation member Or may not be and be physically separated, component shown as a unit may or may not be physical unit, i.e., It can be located in one place, or may be distributed at least two network units.It can be selected according to the actual needs In some or all of the modules achieve the purpose of the solution of this embodiment.Those of ordinary skill in the art are not paying creativeness Labour in the case where, it can understand and implement.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations;To the greatest extent Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into Row equivalent replacement;And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution The range of scheme.

Claims (6)

1. a kind of display screen parameter calibrating method characterized by comprising
According to the parameter of adjustable key point, the Gamma function of display screen is obtained;
The parameter according to adjustable key point obtains the Gamma function of display screen, specifically includes:
Count the gray number of each adjustable key point;
Calculate the gray-scale intensity of each adjustable key point;
According to the gray number of each adjustable key point and the gray-scale intensity, the described of the display screen is obtained Gamma function;
The Gamma function is adjusted according to target Gamma parameter, so that the value of the Gamma function is equal to the target Gamma Parameter;
Wherein, according to the gray number of each adjustable key point and the gray-scale intensity, the Gamma of display screen is obtained Before function, the method also includes:
Determine the priority of each adjustable key point;
Further, according to the gray number of each adjustable key point and the gray-scale intensity, the display is obtained The Gamma function of screen, specifically includes:
According to the gray number, the gray-scale intensity and the priority of each adjustable key point, obtain described aobvious The Gamma function of display screen.
2. the method according to claim 1, wherein the gray-scale intensity uses register parameters and positive-negative polarity Parameter characterizes.
3. according to the method described in claim 2, it is characterized in that, described adjust the Gamma letter according to target Gamma parameter Number specifically includes so that the value of the Gamma function is equal to the target Gamma parameter:
According to the target Gamma parameter and the gray number, the value that the gray-scale intensity makes the Gamma function is adjusted Equal to the target Gamma parameter;
Further, according to the target Gamma parameter and the gray number, adjust the gray-scale intensity make it is described The value of Gamma function is equal to the target Gamma parameter, specifically includes: according to the target Gamma parameter and the grayscale Number, adjusts the register parameters and the positive-negative polarity parameter, so that the value of the Gamma function is equal to the target Gamma parameter.
4. a kind of display screen parametric calibration device characterized by comprising
It obtains module and obtains the Gamma function of display screen for the parameter according to adjustable key point;
Module is adjusted, for adjusting the Gamma function according to target Gamma parameter, so that the value of the Gamma function is equal to The target Gamma parameter;
The acquisition module, specifically includes:
Statistic unit, for counting the gray number of each adjustable key point;
Computing unit, for calculating the gray-scale intensity of each adjustable key point;
Acquiring unit, for according to each adjustable key point the gray number and the gray-scale intensity, described in acquisition The Gamma function of display screen;
Wherein, the acquisition module further include:
Determination unit, for determining the priority of each adjustable key point;
Further, the acquisition module, specifically for the gray number, the grayscale according to each adjustable key point Brightness and the priority obtain the Gamma function of the display screen.
5. device according to claim 4, which is characterized in that the gray-scale intensity uses register parameters and positive-negative polarity Parameter characterizes.
6. device according to claim 5, which is characterized in that the adjustment module is specifically used for according to the target Gamma parameter and the gray number adjust the gray-scale intensity and the value of the Gamma function are made to be equal to the target Gamma parameter;
Further, the adjustment module is specifically used for adjusting institute according to the target Gamma parameter and the gray number Register parameters and the positive-negative polarity parameter are stated, so that the value of the Gamma function is equal to the target Gamma parameter.
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