CN101750764B - Gamma curve detection method and system of LCD screen - Google Patents
Gamma curve detection method and system of LCD screen Download PDFInfo
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- CN101750764B CN101750764B CN2008102180075A CN200810218007A CN101750764B CN 101750764 B CN101750764 B CN 101750764B CN 2008102180075 A CN2008102180075 A CN 2008102180075A CN 200810218007 A CN200810218007 A CN 200810218007A CN 101750764 B CN101750764 B CN 101750764B
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Abstract
The invention is suitable for the field of liquid crystal display (LCD), and provides a gamma curve detection method and system of an LCD screen. The method comprises the following steps of: displaying a standard gray scale image on the LCD screen and acquiring the gray scale information of the gray scale image, wherein the gray scale image contains all gray scales needed by the gamma curve detection for the LCD screen; comparing the acquired gray scale information of the gray scale image displayed on the LCD screen with the gray scale information of an original image, and generating a complex gamma curve according to the comparison result. In the invention, the whole standard gray scale image is directly displayed on the LCD screen, is acquired and is compared with the original image, and the complex gamma curve is generated finally. Because all of the gray scales needed by the gamma curve detection for the LCD screen are displayed in one step, the step of switching the gray scale images of the LCD screen is omitted, and the operation is more convenient and simple.
Description
Technical field
The invention belongs to field of liquid crystal display, relate in particular to a kind of gamma curve detection method and system of LCD screen.
Background technology
For LCD (Liquid Crystal Display, LCD), input voltage signal will produce brightness output on screen, but the brightness of LCD is not directly proportional with the voltage signal of input, have a kind of distortion, if input is black-and-white image signal, this distortion will make the middle tuningout of the image that is shown dark, thereby make the integral body of image darker partially than original scene, gamma is exactly the metric parameter of this distortion.The LCD of which kind of brand no matter, because the consistance of physical principle, its gamma value almost is a constant.
Owing to there is the gamma distortion, the image of input voltage signal representative can be darker than original graph kine bias when screen display, and such image can not directly be used, and needs to proofread and correct this distortion.Consider that the gamma value is a constant, immutable, so trimming process just can only be at the image voltage signal of input, principle is for going the reverse direction of normal image voltage signal to the display distortion to adjust, since distortion makes the middle tone deepening of image, before the image voltage signal was input to display, the middle tone with this voltage signal lightened earlier so, and then be input to display, so just can offset the distortion of display.Because the gamma value of display is a constant, so the amplitude of this correction also is relatively-stationary, the metric parameter of this correction amplitude also is gamma.Owing to be subjected to the influence of LCD inner structure, there is a certain distance in actual displayed brightness and the standard gamma curve display brightness that set of LCD under each GTG, therefore, reach consistent, often need carry out gamma once more and detect LCD with original image in order to make display effect.
Compound gamma curve reflects the voltage signal of input picture exactly and passes through a curve that concerns between the output voltage signal of the LCD screen after gamma proofreaies and correct.If gamma calibration accuracy, compound gamma are 1.0.By compound gamma curve, it is normal to find out easily whether the LCD screen shows, can infer further whether the gamma correction amplitude of this LCD is accurate.
Prior art to the gamma parameter correction principle of LCD is: make this LCD to be measured show a certain grey menu according to the pairing parameter information of standard gamma curve and the gray scale voltage of its storage inside; Utilize the actual displayed brightness of the shown grey menu of this LCD to be measured of a photoreceptor sensing, and be a digital voltage signal this actual displayed brightness transition; Utilize a micro-control unit relatively this digital voltage signal and the pairing parameter information of this standard gamma curve, and regulate the gray scale voltage of this LCD to be measured according to comparative result.
Adopt above-mentioned bearing calibration, LCD to be measured can only show the one-level gray scale image at every turn, after having surveyed a kind of brightness, the operator also will be switched the gray scale image of LCD screen, and to test eight groups of gray scale images usually, like this will be more loaded down with trivial details, cause human and material resources and temporal waste.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of gamma curve detection method of LCD screen, is intended to solve the problem of existing gamma detection method complex operation.
The embodiment of the invention is achieved in that a kind of gamma curve detection method of LCD screen, said method comprising the steps of:
Display standard gray scale image and obtain the gray level information of this image on the LCD screen, described standard gray scale image include the LCD screen are carried out the needed whole GTGs of gamma curve detection;
The LCD that gets access to is shielded the gray level information of shown image and the gray level information of original image compares, and generate compound gamma curve according to comparing result.
Another purpose of the embodiment of the invention is to provide a kind of gamma curve detection system of LCD screen, comprising:
Host computer, microcontroller and camera;
Described host computer is used for standard gray scale image data transmission to described microcontroller, and controls described microcontroller and be transferred in the LCD screen to be measured after with described standard gray scale image data decoding, makes LCD screen display standard gray scale image to be measured; Described standard gray scale image includes LCD screen is carried out the needed whole GTGs of gamma curve detection;
Described camera is used to gather the shown standard gray scale image of LCD screen to be measured, and transfers to described host computer by described microcontroller;
Described host computer is used to obtain the gray level information that LCD to be measured shields shown image, and the LCD to be measured that will get access to shields the gray level information of shown image and the gray level information of original image compares, and generates compound gamma curve according to comparing result.
In the embodiment of the invention, by on the LCD screen, directly showing whole standard gray scale image, and gather this image, this image and source images are compared, the compound gamma curve of final generation, owing to disposablely LCD screen is carried out the needed whole GTGs of gamma curve detection show, and saved switching between the gray scale image of LCD screen, operated easier.
Description of drawings
Fig. 1 is the realization flow figure of the gamma curve detection method of the LCD screen that provides of the embodiment of the invention;
Fig. 2 is whole the standard gray scale image synoptic diagram that the embodiment of the invention provides;
Fig. 3 is the structure principle chart of system of the gamma curve detection of the LCD screen that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
In the embodiment of the invention, on the LCD screen, directly show whole standard gray scale image, and gather this image, this image and source images are compared, generate compound gamma curve.
The realization flow of the gamma curve detection method that the LCD that Fig. 1 shows the embodiment of the invention to be provided shields, details are as follows:
In step S101, display standard gray scale image and obtain the gray level information of this image on the LCD screen, described standard gray scale image include the LCD screen are carried out the needed whole GTGs of gamma curve detection.
In the embodiment of the invention, whole the standard gray scale image that directly shows on the LCD screen as shown in Figure 2, is example with eight groups of GTGs, and zone 1 is corresponding one by one with needed whole eight groups of GTG values to the GTG in zone 8.The gray level information that the described LCD that gets access to shields shown image includes the actual gray value information that LCD shields shown each gray-scale areas of image, can be averaged by the GTG value of being had a few that LCD shields each gray-scale areas of shown image and obtain this regional actual gray value.
In step S102, the LCD that gets access to is shielded the gray level information of shown image and the gray level information of original image compares, and generate compound gamma curve according to comparing result.
The GTG value of the gray-scale areas of standard gray scale image is and increases progressively variation, and the GTG value of being had a few of each gray-scale areas of original image is averaged, as this regional standard GTG value; Therefore all there are an actual gray value and corresponding standard GTG value in each zone, is example with Fig. 2, has eight actual gray values and eight standard GTG values.Setting up coordinate system with actual gray value information and standard GTG value information, is horizontal ordinate with standard GTG value for example, and the actual gray value is an ordinate, and curve plotting can generate compound gamma curve.With originally only showed that a kind of method difference of data acquisition of GTG was, method originally can only be gathered the GTG value of the last some points of screen, be to improve precision, it must repeatedly be gathered same point, so efficient is lower.
The structural principle of the system of the gamma curve detection that the LCD that Fig. 3 shows the embodiment of the invention to be provided shields for convenience of description, only shows the part relevant with present embodiment.
With reference to Fig. 3, host computer 31 is mutual by its USB interface and microcontroller 32, at first 31 pairs of microcontroller 32 initialization of host computer, and carry out initialization by 32 pairs of cameras of microcontroller 33, then host computer 31 with standard gray scale image data transmission to the buffer area of microcontroller 32, and send write order, control microcontroller 32 is transferred to LCD 34 to be measured after with standard gray scale image data decoding, make LCD 34 display standard gray scale images to be measured, wherein, the standard gray scale image includes LCD screen is carried out the needed whole GTGs of gamma curve detection.
In the embodiment of the invention, according to the vedio data of the LCD to be measured 34 that collects camera 33 is focused earlier, gather the static image data of LCD 34 to be measured again.After host computer 31 is confirmed to have sent standard gray scale image data, time-delay a period of time sends the video read signal to microcontroller 32, behind microcontroller 32 these video read signals of identification, configuration camera 33 is the video image acquisition pattern, and request camera 33 begins to gather vedio data.After camera 33 receives the request command of microcontroller 32, gather the vedio data of the standard that the shows gray scale image of LCD 34 to be measured, and after collection finishes with data transmission to the buffer area of microcontroller 32, again vedio data is transferred to host computer 31 by microcontroller 32 and handles.
31 pairs of vedio datas of host computer are resolved the back display video image, the video image that the user is shown according to host computer 31, regulate the relative position of camera 33 apart from LCD 34 to be measured, and the focusing of camera 34 from object distance etc., make camera 34 can collect the image of optimum efficiency.When the user after host computer 31 screens are observed satisfied image, trigger host computer 31 and send the static image data acquisition to microcontroller 32, microcontroller 32 and then configuration camera 33 are the still image drainage pattern, and receive the static image data that camera 33 collects, then this static image data is transferred to host computer 31.
After host computer 31 receives static image data, obtain the gray level information that LCD to be measured shields shown image, and the LCD to be measured that will get access to shields the gray level information of shown image and the gray level information of original image compares.The gray level information that LCD wherein to be measured shields shown image includes the actual gray value information that LCD to be measured shields shown each gray-scale areas of image, can be averaged by the GTG value of being had a few that 31 couples of LCD to be measured of host computer shield each gray-scale areas of shown image and obtain, the gray level information of original image includes the standard GTG value information of each gray-scale areas of original image, can be averaged by the GTG value of being had a few of each gray-scale areas of 31 pairs of original images of host computer to obtain.Host computer 31 is set up coordinate system with actual gray value and standard GTG value, and draws the compound gamma curve of generation in conjunction with the actual gray value information of each gray-scale areas and the standard GTG value information of each gray-scale areas.
In the embodiment of the invention, for guaranteeing the precision of 33 images acquired of camera, microcontroller 32, camera 33 and LCD to be measured 34 place a magazine, with the shielding external light source.Further, microcontroller 32 can place a main control wiring board.
In the embodiment of the invention, by on the LCD screen, directly showing whole standard gray scale image, and gather this image, this image and source images are compared, the compound gamma curve of final generation, owing to disposablely LCD screen is carried out the needed whole GTGs of gamma curve detection show, and saved switching between the gray scale image of LCD screen, operated easier; And, can shield external light source by microcontroller, camera and LCD to be measured are placed in the magazine, more help guaranteeing the precision of camera institute images acquired.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the gamma curve detection method of a LCD screen is characterized in that, said method comprising the steps of:
Display standard gray scale image and obtain the gray level information of this image on the LCD screen, described standard gray scale image include the LCD screen are carried out the needed whole GTGs of gamma curve detection;
Expect that with getting access to LCD shields the gray level information of shown image and the gray level information of original image compares, and generate compound gamma curve according to comparing result.
2. the method for claim 1, it is characterized in that, the gray level information that the described LCD that gets access to shields shown image includes the actual gray value information that LCD shields shown each gray-scale areas of image, and the gray level information of described original image includes the standard GTG value information of each gray-scale areas of original image;
Described the gray level information of the image that gets access to and the gray level information of original image are compared, and are specially according to the step that comparing result generates compound gamma curve:
Set up coordinate system with described actual gray value and described standard GTG value, and draw the compound gamma curve of generation in conjunction with the actual gray value information of each gray-scale areas and the standard GTG value information of each gray-scale areas.
3. method as claimed in claim 2 is characterized in that, the actual gray value information of described each gray-scale areas is averaged by the GTG value of being had a few of this gray-scale areas of LCD being shielded shown image and obtains; The standard GTG value information of described each gray-scale areas is averaged by the GTG value of being had a few to this gray-scale areas of original image and obtains.
4. as claim 1,2 or 3 described methods, it is characterized in that the GTG value of the gray-scale areas of described display standard gray scale image is and increases progressively variation.
5. the gamma curve detection system of LCD screen is characterized in that described system comprises:
Host computer, microcontroller and camera;
Described host computer is used for standard gray scale image data transmission to described microcontroller, and controls described microcontroller and be transferred in the LCD screen to be measured after with described standard gray scale image data decoding, makes LCD screen display standard gray scale image to be measured; Described standard gray scale image includes LCD screen is carried out the needed whole GTGs of gamma curve detection;
Described camera is used to gather the shown standard gray scale image of LCD screen to be measured, and transfers to described host computer by described microcontroller;
Described host computer is used to obtain the gray level information that LCD to be measured shields shown image, and the LCD to be measured that will get access to shields the gray level information of shown image and the gray level information of original image compares, and generates compound gamma curve according to comparing result.
6. system as claimed in claim 5, it is characterized in that, the gray level information that the LCD to be measured that described host computer gets access to shields shown image includes the actual gray value information that LCD to be measured shields shown each gray-scale areas of image, and the gray level information of described original image includes the standard GTG value information of each gray-scale areas of original image;
Described host computer is set up coordinate system with described actual gray value and described standard GTG value, and draws the compound gamma curve of generation in conjunction with the actual gray value information of each gray-scale areas and the standard GTG value information of each gray-scale areas.
7. system as claimed in claim 5 is characterized in that, described host computer shields each gray-scale areas of shown image to the LCD to be measured GTG value of being had a few is averaged with as this regional actual gray value information; Described host computer is averaged with as this regional standard GTG value information the GTG value of being had a few of each gray-scale areas of original image.
8. system as claimed in claim 5 is characterized in that, described microcontroller, camera and LCD to be measured screen place a magazine.
9. as each described system of claim 5 to 8, it is characterized in that described microcontroller places a main control wiring board.
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| CN2008102180075A CN101750764B (en) | 2008-12-02 | 2008-12-02 | Gamma curve detection method and system of LCD screen |
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| CN2008102180075A CN101750764B (en) | 2008-12-02 | 2008-12-02 | Gamma curve detection method and system of LCD screen |
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| CN101750764B true CN101750764B (en) | 2011-12-14 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102621717B (en) * | 2011-04-01 | 2014-05-14 | 北京国科世纪激光技术有限公司 | Method and system for measuring gamma curve of liquid crystal spatial light modulator |
| CN102566095B (en) * | 2011-09-15 | 2015-01-21 | 北京国科世纪激光技术有限公司 | Method and system for measuring gamma curves of liquid crystal spatial light modulator |
| CN103179409B (en) * | 2013-03-21 | 2015-07-22 | 深圳市创维群欣安防科技有限公司 | Video penetrating fog processing method and device |
| CN103716565A (en) * | 2013-12-20 | 2014-04-09 | 乐视致新电子科技（天津）有限公司 | Display equipment and method and device for setting analog-digital conversion parameters in display equipment |
| CN103747243A (en) * | 2013-12-31 | 2014-04-23 | 深圳市华星光电技术有限公司 | LCD (Liquid Crystal Display) full-grayscale data acquisition method on basis of CCD (Charge Coupled Device) camera |
| CN103730096B (en) * | 2013-12-31 | 2016-09-14 | 深圳市华星光电技术有限公司 | White balance adjustment method and system, liquid crystal display manufacture method |
| CN107479222B (en) * | 2017-08-28 | 2020-08-11 | 惠科股份有限公司 | Measuring method and device for measuring display panel |
| CN108761868B (en) * | 2018-07-11 | 2024-01-05 | 武汉精测电子集团股份有限公司 | Automatic Gamma detection machine for display panel |
| CN109147642B (en) * | 2018-09-18 | 2021-10-08 | 深圳市理邦精密仪器股份有限公司 | Gamma correction method and device for display screen |
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| CN1845232A (en) * | 2005-04-08 | 2006-10-11 | 浙江大学 | Automatic measurement and correction method and system for LCD GAMMA curve and color temperature |
| CN101231830A (en) * | 2007-01-26 | 2008-07-30 | 群康科技(深圳)有限公司 | Method for generating LCD device gamma correction table |
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Patent Citations (4)
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| US6281944B1 (en) * | 1997-08-25 | 2001-08-28 | Lg Electronics Inc. | Apparatus and method for correcting non-linear characteristics in display device |
| CN1655015A (en) * | 2004-02-13 | 2005-08-17 | 钰瀚科技股份有限公司 | Luminance compensation method and device for liquid crystal display |
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| CN101231830A (en) * | 2007-01-26 | 2008-07-30 | 群康科技(深圳)有限公司 | Method for generating LCD device gamma correction table |
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