CN101976540B - Method for automatically adjusting grey-scale consistency of display - Google Patents
Method for automatically adjusting grey-scale consistency of display Download PDFInfo
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- CN101976540B CN101976540B CN201010552362A CN201010552362A CN101976540B CN 101976540 B CN101976540 B CN 101976540B CN 201010552362 A CN201010552362 A CN 201010552362A CN 201010552362 A CN201010552362 A CN 201010552362A CN 101976540 B CN101976540 B CN 101976540B
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Abstract
The invention discloses a method for automatically adjusting grey-scale consistency of a display, which comprises the following steps of: displaying a picture of any gray scale i on the display; adjusting values of Cb and Cr of the gray scale until T and delta uv satisfy a color temperature acceptance standard and a color difference acceptance standard respectively; then converting a differential signal YCbCr of each gray scale into an RGB value through a preset signal conversion formula; and adjusting the RGB value of the display according to the RGB value so as to adjust the gray scale of the display and finally ensure that the display meets the requirement on the grey-scale consistency. The method for automatically adjusting the gray-scale consistency of the display can effectively reduce the distortion existing between the brightness and input voltage signals of the display by automatically adjusting the grey-scale consistency of the display to make the brightness display of the display normal and improve the image displaying effect of the display, so the method is favorable for improving the product use experience of a user to the display, and has important production practical significance.
Description
Technical field
The present invention relates to the display technology field, particularly relate to the conforming method of a kind of automatic adjustment display GTG.
Background technology
Continuous development along with human sciences's technology; Domestic electric appliances such as computing machine, televisor, video camera, camera are more and more universal in people's daily life; People often use a computer and understand the information of outside and learn, and computing machine has become people's indispensable ingredient of living.
For present graphoscope; Input voltage signal will produce the output of brightness on screen, but because the characteristics of luminescence of liquid crystal molecule makes the brightness of display not be directly proportional with the voltage signal of input; There is a kind of distortion; If input is black-and-white image signal, this distortion will make the centre of the image that is shown dark partially, thereby make the integral body of image darker partially than original scene; If input is colour picture signal, this distortion except make images displayed partially secretly, the tone of images displayed is squinted.Thereby; Usually need adjust the GTG consistance of display and correct this distortion; This also is one of the project that need measure when carrying out TCO (The Swedish Confederation of Professional Employees, Sweden specialty office worker alliance) authentication simultaneously.
Need to prove, for display, linear proportional relation between input voltage signal and the GTG; For example GTG 0 (with RGB (red, green, blue) signal indication is R=0, G=0, B=0) corresponding input voltage is 0V; GTG 255 (R=255; G=255, B=255) corresponding input voltage is 0.7V, this also is the maximal value of voltage signal.Between the brightness and GTG of display, be non-linear proportional relation between brightness and the input voltage signal.Computer sends the signal of a certain GTG, handles through the display image process chip, and the liquid crystal molecule of voltage signal processed control display screen, thus demonstrate certain brightness.
But, also there is not at present the distortion that exists between the voltage signal of brightness that a kind of technology can reduce display effectively and input, the brightness that guarantees display shows normal, the display picture demonstration has good effect.
Summary of the invention
In view of this; The purpose of this invention is to provide the conforming method of a kind of automatic adjustment display GTG, can be through automatic adjustment display GTG consistance, make the distortion that exists between the brightness that reduces display effectively and the input voltage signal; Make the brightness of display show normal; Improve the image display effect of display, help improving the product use experience of user, be of great practical significance display.
The invention provides the conforming method of a kind of automatic adjustment display GTG for this reason, comprise step:
A) picture of any GTG i of demonstration on display;
B) the colour temperature T of measurement display; If colour temperature T meets preset colour temperature criterion of acceptability, execution in step C so), otherwise; Change the value of the chroma blue component Cb among this display differential signal YCbCr, meet the preset color temperature criterion of acceptability up to the colour temperature T of display;
C) the aberration △ uv of display is measured in continuation; If aberration △ uv meets preset aberration criterion of acceptability, execution in step D so), otherwise; Change the value of the red color component Cr among this display differential signal YCbCr, meet preset aberration criterion of acceptability up to the aberration △ of display uv;
D) measure the colour temperature T of this display once more, if colour temperature T meets preset colour temperature criterion of acceptability, execution in step E so), otherwise, return execution in step B);
E) through preset conversion of signals formula, the differential signal YCbCr that will meet the display of preset color temperature criterion of acceptability and preset aberration criterion of acceptability converts RGB rgb signal value into;
F) according to said rgb value the rgb value of display is adjusted, realized the GTG of adjustment display, finally make display satisfy the GTG coherence request.
Wherein, test the colour temperature T and the aberration △ uv of display through a display color analyser CA-210.
Wherein, at step B) in, said colour temperature criterion of acceptability is: any two for display differ 16 GTG, and the colour temperature of low GTG is than the high 100 ~ 150K of colour temperature of high gray.
Wherein, at step C) in, said aberration criterion of acceptability is: the difference between the aberration of each GTG of display and the 255 GTG aberration is-0.0005 ~+0.0005.
Wherein, in step e) in, said preset conversion of signals formula is: R=Y+1.402 * Cr, G=Y-0.34414 * Cb-0.71414 * Cr, B=Y+1.772 * Cr.
Wherein, The picture that on display, shows 255,240,224,208,192,176,160,144,128,112,96,80,64,48,32 GTGs successively; Regulate the Cb of these GTGs, the value of Cr respectively; Satisfy colour temperature criterion of acceptability and aberration criterion of acceptability respectively up to T, △ uv; Convert the differential signal YCbCr of each GTG the value of RGB into through preset conversion of signals formula then, just can obtain the rgb value of 0 ~ 255 each GTG at last through the method for averaging, final realization is to the automatic adjustment of 0 ~ 255 GTG.
Visible by above technical scheme provided by the invention; Compared with prior art, the invention provides the conforming method of a kind of automatic adjustment display GTG, can be through adjusting display GTG consistance automatically; Make the distortion that exists between the brightness reduce display effectively and the input voltage signal; Improve the image display effect of display, help improving the product use experience of user, be of great practical significance display.
Description of drawings
Fig. 1 is the process flow diagram of the conforming method of a kind of automatic adjustment display GTG provided by the invention.
Embodiment
In order to make those skilled in the art person understand the present invention program better, the present invention is done further detailed description below in conjunction with accompanying drawing and embodiment.
For the ease of understanding the present invention, describe in the face of the relation between the parameters such as GTG, colour temperature T, aberration △ uv in the LCD down.
For LCD; Because the characteristic that LCDs has, the brightness of display is not directly proportional with input voltage signal, has a kind of distortion; So need adjust the GTG consistance of display usually, make colour temperature T, aberration △ uv satisfy preset specification.Wherein, colour temperature is an important quantization parameter of color, and quantitative representes color with kelvin degree (K).Colour temperature is big more, and color is dark more, and colour temperature is more little, and color is bright more.The design of present display and production all are that D65 (6500K) light source with international standard designs, so the specification of 255 GTG colour temperature T should be in 6500 ± 700K.GTG for 0 ~ 255, their △ uv is approaching more, and their consistance is good more so.
Therefore, in the present invention, have good GTG consistance, need adjustment colour temperature T and aberration △ uv, make colour temperature T and aberration △ uv meet criterion of acceptability in order to make display.Wherein, the criterion of acceptability of colour temperature T (being specification) is: any two for display differ between 16 the GTG, and low GTG is than the high successively 100 ~ 150K of high gray.For example, 240 GTG colour temperatures are than the high 100 ~ 150K of colour temperature of 255 GTGs, and 224 GTGs are than the high 100 ~ 150K of colour temperature of 240 GTGs.The criterion of acceptability of aberration △ uv (being specification) is: each GTG of display is all close with 255 GTGs, and the difference between 255 GTGs is between-0.0005 ~+0.0005.For the present invention, according to such colour temperature specification and aberration specification, then can so that 0 ~ 255 GTG can be uniformly by dark to bright variation, and do not have tangible colour cast between each GTG.Wherein, 0 GTG is the darkest zone, and 255 GTGs are the brightest zone.
In the present invention; In order to adjust the consistance of display GTG; Mainly be that each Cb, Cr that need adjust among the YCbCr (Y is meant luminance component, and Cb refers to the chroma blue component, and Cr refers to the red color component) of the display of GTG is adjusted; Make colour temperature T, aberration △ uv satisfy preset specification (being criterion of acceptability); Calculate rgb value (specifically can with the form of RGB function table) through formula at last, this rgb value is written in the image display chip of display, display GTG consistance is met the demands.
Need to prove that the present invention confirms method of adjustment according to the relation of Cb, Cr and T, Δ uv.Their relation is: T increases and increases along with Cb, and Δ uv increases along with Cb and reduces, and wherein Cb is bigger to the influence of T; T reduces along with the increase of Cr, and Δ uv reduces along with the increase of Cr, and wherein Cr is bigger to the influence of △ uv.So the present invention mainly is through Cb adjustment T, through Cr adjustment Δ uv.
Based on above-mentioned theoretical foundation, referring to Fig. 1, the invention provides the conforming method of a kind of automatic adjustment display GTG, may further comprise the steps:
Step S101: the picture that on display, shows any GTG i;
Step S102: the colour temperature T that measures display; If colour temperature T meets preset colour temperature criterion of acceptability, execution in step S103 so, otherwise; Change the value of the chroma blue component Cb among this display differential signal YCbCr, meet the preset color temperature criterion of acceptability up to the colour temperature T of display;
As previously mentioned, the present invention confirms method of adjustment according to the relation of Cb, Cr and T, Δ uv.Their relation is: T increases and increases along with Cb, and Δ uv increases along with Cb and reduces, and wherein Cb is bigger to the influence of T; T reduces along with the increase of Cr, and Δ uv reduces along with the increase of Cr, and wherein Cr is bigger to the influence of △ uv.
As previously mentioned, the present invention mainly is through Cb adjustment T, through Cr adjustment Δ uv.
On concrete the realization, the present invention tests the colour temperature T of display through a display color analyser CA-210.
Need to prove; Said colour temperature criterion of acceptability can be set according to user's needs in advance; In the present invention, said colour temperature criterion of acceptability is preferably: any two for display differ 16 GTG, and the colour temperature of low GTG is than the high 100 ~ 150K of colour temperature of high gray.
Step S103: the aberration △ uv that continues to measure display; If aberration △ uv meets preset aberration criterion of acceptability; Execution in step S104 so; Otherwise, change the value of the red color component Cr among this display differential signal YCbCr, meet preset aberration criterion of acceptability up to the aberration △ of display uv;
On concrete the realization, the present invention tests the aberration △ uv of display through a display color analyser CA-210.
As previously mentioned, the present invention mainly is through Cb adjustment T, through Cr adjustment Δ uv.
Need to prove; Said aberration criterion of acceptability can be set according to user's needs in advance; In the present invention; Said aberration criterion of acceptability is preferably: the difference between the aberration of each GTG of display and the 255 GTG aberration is-0.0005 ~+0.0005, and promptly the aberration of each GTG is all approaching with the aberration of 255 GTGs.
Step S104: measure the colour temperature T of this display once more, if colour temperature T meets preset colour temperature criterion of acceptability, execution in step S105 so, otherwise, return execution in step S102;
Need to prove that as previously mentioned, the YCbCr signal (differential signal) of said display includes: luminance component Y, chroma blue component Cb and red color component Cr.
Step S105: through preset conversion of signals formula, the YCbCr (differential signal) that will meet the display of preset color temperature criterion of acceptability and preset aberration criterion of acceptability converts RGB (RGB) signal value into;
Need to prove,, obtain to meet the rgb value of preset color temperature criterion of acceptability and preset aberration criterion of acceptability through this step S105.
In the present invention, the formula that said YCbCr differential signal converts the rgb signal value into is: R=Y+1.402 * Cr, G=Y-0.34414 * Cb-0.71414 * Cr, B=Y+1.772 * Cr.
Step S106: according to said rgb value the rgb value of display is adjusted, realized the GTG of adjustment display, finally make display satisfy GTG coherence request (that is to say and make the picture that shows on the display meet the conforming requirement of GTG).
Need to prove, for any GTG i, be expressed as R=r, G=g, B=b with rgb signal.For example, GTG 16 is R=17 with RGB (red, green, blue) signal indication, G=16, B=18.Therefore, through this step S106, can obtain to meet the GTG i of preset color temperature criterion of acceptability and preset aberration criterion of acceptability, that is to say, each GTG i of display can satisfy coherence request.
In the present invention; On concrete the realization; Can on display, show and regulate the Cb of 255,240,224,208,192,176,160,144,128,112,96,80,64,48,32 GTGs, the value of Cr successively; Satisfy specification up to T, △ uv, and YCbCr (differential signal) is converted into the value of RGB according to above-mentioned conversion formula.Just can obtain the rgb value of 0 ~ 255 each GTG at last through the method for averaging.For example, for any GTG i between 240 ~ 224, its rgb value is following:
R（i）=R（240）+（（R（i）-R（240））/（R（240）-R（224））
G（i）=G（240）+（（G（i）-G（240））/（G（240）-G（224））
B（i）=B（240）+（（B（i）-B（240））/（B（240）-B（224））
Through above-mentioned formula, calculate the rgb value that can obtain any GTG i successively.Thereby can realize adjustment according to this rgb value to the display GTG.
For the present invention; It provides a kind of automatic adjustment display GTG conforming method; Mainly be that each Cb, Cr that need adjust the YCbCr (differential signal) of GTG i is adjusted, make colour temperature T, aberration △ uv satisfy predefined criterion of acceptability (specification), calculate rgb value through formula at last; This rgb value is written in the image display chip of display, display GTG consistance is met the demands.This method provided by the invention has realized the conforming function of automatic adjustment GTG, makes display have good GTG consistance, can satisfy the demand of the Sweden specialty office worker TCO of alliance test, has saved great amount of manpower, effectively raises work efficiency.
In sum, compared with prior art, the invention provides the conforming method of a kind of automatic adjustment display GTG; Can be through adjusting display GTG consistance automatically; Make the distortion that exists between the brightness reduce display effectively and the input voltage signal, it is normal to make that the brightness of display shows, improves the image display effect of display; Help improving the product use experience of user, be of great practical significance display.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (6)
1. adjust the conforming method of display GTG automatically for one kind, it is characterized in that, comprise step:
A) picture of any GTG i of demonstration on display;
B) the colour temperature T of measurement display; If colour temperature T meets preset colour temperature criterion of acceptability, execution in step C so), otherwise; Change the value of the chroma blue component Cb among this display differential signal YCbCr, meet the preset color temperature criterion of acceptability up to the colour temperature T of display;
C) the aberration △ uv of display is measured in continuation; If aberration △ uv meets preset aberration criterion of acceptability, execution in step D so), otherwise; Change the value of the red color component Cr among this display differential signal YCbCr, meet preset aberration criterion of acceptability up to the aberration △ of display uv;
D) measure the colour temperature T of this display once more, if colour temperature T meets preset colour temperature criterion of acceptability, execution in step E so), otherwise, return execution in step B);
E) through preset conversion of signals formula, the differential signal YCbCr that will meet the display of preset color temperature criterion of acceptability and preset aberration criterion of acceptability converts RGB rgb signal value into;
F) according to said rgb value the rgb value of display is adjusted, realized the GTG of adjustment display, finally make display satisfy the GTG coherence request.
2. the method for claim 1 is characterized in that, tests the colour temperature T and the aberration △ uv of display through a display color analyser CA-210.
3. the method for claim 1 is characterized in that, at step B) in, said colour temperature criterion of acceptability is: any two for display differ 16 GTG, and the colour temperature of low GTG is than the high 100 ~ 150K of colour temperature of high gray.
4. the method for claim 1 is characterized in that, at step C) in, said aberration criterion of acceptability is: the difference between the aberration of each GTG of display and the 255 GTG aberration is-0.0005 ~+0.0005.
5. the method for claim 1 is characterized in that, in step e) in, said preset conversion of signals formula is: R=Y+1.402 * Cr, G=Y-0.34414 * Cb-0.71414 * Cr, B=Y+1.772 * Cr.
6. like each described method in the claim 1 to 5; It is characterized in that; The picture that on display, shows 255,240,224,208,192,176,160,144,128,112,96,80,64,48,32 GTGs successively; Regulate the Cb of these GTGs, the value of Cr respectively, satisfy colour temperature criterion of acceptability and aberration criterion of acceptability respectively, through preset conversion of signals formula the differential signal YCbCr of each GTG is converted into the value of RGB then up to T, △ uv; Just can obtain the rgb value of 0 ~ 255 each GTG at last through the method for averaging, the final automatic adjustment that realizes 0 ~ 255 GTG.
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Citations (3)
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|---|---|---|---|---|
| US4725879A (en) * | 1987-03-27 | 1988-02-16 | Honeywell Inc. | Chroma responsive inspection apparatus selectively producing analog voltage levels based on the luminance, the phase of the chrominance subcarrier, or the amplitude of the chrominance subcarrier |
| CN1996442A (en) * | 2006-01-05 | 2007-07-11 | 英业达股份有限公司 | Detecting and adjusting device for display color temperature and method therefor |
| CN101587703A (en) * | 2008-05-22 | 2009-11-25 | 纬创资通股份有限公司 | Method and device for adjusting color temperature coordinate value measured by color analyzer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2618908B2 (en) * | 1987-08-13 | 1997-06-11 | 富士写真フイルム株式会社 | Automatic white balance adjustment method and apparatus |
| JP3744778B2 (en) * | 2000-08-28 | 2006-02-15 | セイコーエプソン株式会社 | Image projection apparatus, image processing method, and information storage medium |
| JP3855881B2 (en) * | 2002-08-09 | 2006-12-13 | セイコーエプソン株式会社 | Color correction circuit and image display apparatus having the same |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4725879A (en) * | 1987-03-27 | 1988-02-16 | Honeywell Inc. | Chroma responsive inspection apparatus selectively producing analog voltage levels based on the luminance, the phase of the chrominance subcarrier, or the amplitude of the chrominance subcarrier |
| CN1996442A (en) * | 2006-01-05 | 2007-07-11 | 英业达股份有限公司 | Detecting and adjusting device for display color temperature and method therefor |
| CN101587703A (en) * | 2008-05-22 | 2009-11-25 | 纬创资通股份有限公司 | Method and device for adjusting color temperature coordinate value measured by color analyzer |
Non-Patent Citations (2)
| Title |
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| JP昭64-46391A 1989.02.20 |
| JP特公平7-4019B2 1995.01.18 |
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