CN102879183A - Method for measuring display brightness of reinforced liquid crystal display modules in high-temperature environments - Google Patents

Abstract

The invention relates to a method for measuring the display brightness of reinforced liquid crystal display modules in high-temperature environments. Measuring equipment for implementing the method comprises a temperature control box, a colorimeter and brightness meter assembly and a high-sensitivity camera. A glass window is arranged on a door of the temperature control box, a reinforced liquid crystal display module to be measured is placed inside the temperature control box, and the colorimeter and brightness meter assembly and the high-sensitivity camera are positioned on the outside of the temperature control box. The method includes that a relation equation between the brightness of pictures shot by the high-sensitivity camera and the brightness, which is measured via the glass window, of the reinforced liquid crystal display module and a relation equation between the display brightness measured via the glass window and the display brightness measured directly are created via two calibration processes, and the screen-front brightness of the reinforced liquid crystal display module in a high-temperature environment can be computed and deduced via the two relation equations. The method has the advantages that the display brightness of the reinforced liquid crystal display module in the high-temperature environment can be measured only by using the existing measuring equipment, the method for measuring the display brightness is simple and feasible, and a measurement result is accurate and reliable.

Description

Reinforce the measuring method of display brightness under the LCD MODULE hot environment

Technical field

The invention belongs to technical field of liquid crystal display, be specifically related to reinforce the measuring method of LCD MODULE display brightness under hot environment.

Background technology

Be different from common display apparatus for commercial use, military LCD MODULE need to satisfy some specific (special) requirements, comprises high brightness, high-contrast, high electromagnetic screen, wide working temperature etc.Because of the requirement of its high reliability, military LCD MODULE need to be passed through thermocycling, vibratory test, humid test, mould test etc. usually, still can work under rugged surroundings to ensure.

At present, usually adopt the method that the common liquid crystals screen is reinforced to improve its reliability, above the common liquid crystals display screen, use exactly optical cement as the bonding reinforcing glass with anti-reflection, electro-magnetic screen function of cementing agent.Reinforce glass and be generally optics execution glass, be coated with the anti-reflection film in one side, another side is coated with ITO film with electro-magnetic screen function and the optical match layer close with the refractive index of optical cement.The patent " a kind of reinforced liquid crystal display module and preparation method thereof " of Avic Huadong Photoelectric Co., Ltd.'s application (application number: 201110173947.9) describe the manufacture craft process of reinforcing LCD MODULE in detail.

Usually adopt the front brightness of chroma luminance instrumentation amount display screen.But because the chroma luminance meter comprises a lot of high-precision optical elements and electronic component, can only be operated under the normal temperature environment, can't at high temperature work, therefore up to now, reinforce the display characteristic that all can only adopt when each manufacturer of LCD MODULE carries out hot test under the manual method judgement hot environment.When carrying out hot test, at first tested reinforcing display module is put into temperature control box, allow tested reinforcing LCD MODULE show complete white, then the temperature control box temperature is risen to 60 ℃, after insulation a period of time, rely on human eye subjective judgement display performance whether normal.Brightness and inhomogeneity variation appear in the viewing area if human eye is seen tested reinforcing LCD MODULE, judge that then this module is substandard product.

There are several drawbacks in existing hot test based on the human eye subjective judgement: 1, False Rate is large: than surveying instrument, the sensitivity of human eye is lower, and the situation human eye that a lot of intrinsic brilliances have changed can't detect, and causes erroneous judgement; 2, subjective impact is large: there is larger difference in human eye, and brightness, inhomogeneity sensitivity differ larger, cause the inconsistent of product acceptability criteria; 3, proving time is long: the error that manufacturer brings for fear of artificial judgment, often carry out the multiple high temp test, and each hot test to continue more than 2 hours, and repeatedly cyclic test causes the waste of time, human and material resources.And chroma luminance testing tool that still can steady operation under the customization hot environment then needs to spend a large amount of financial resources, needs simultaneously existing equipment is transformed.Therefore exploitation can use existing testing apparatus to reinforcing the method that the LCD MODULE display brightness is measured under the hot environment, can help manufacturing enterprise in the situation that do not need to carry out substantial contribution and drop into raising product export qualification rate, reduce production costs.

Summary of the invention

In order to improve the Detection accuracy of reinforcing LCD MODULE display brightness under hot environment, to shorten detection time, the invention provides a kind of measuring method of using display brightness under the reinforcing LCD MODULE hot environment that testing tool commonly used just can finish.

Concrete technical scheme of the present invention is as follows:

1. reinforce the measuring method of LCD MODULE display brightness under hot environment, measure device therefor and comprise temperature control box, chroma luminance meter and high sensitivity camera (CCD); The door of described temperature control box is provided with glass window, tested reinforcing LCD MODULE is placed on the inside of temperature control box, and chroma luminance meter and high sensitivity camera (CCD) are positioned at the outside of temperature control box;

(1) do not start temperature control box, open the door of temperature control box, open tested reinforcing LCD MODULE power switch, show a complete white picture, directly measure brightness before the screen of tested reinforcing LCD MODULE central point with the chroma luminance meter, obtain brightness value before the first screen, be designated as L ₁₀₀, index number wherein represents to shield front brightness, described L ₁₀₀In index number represent that the liquid crystal pixel aperture is brightness before the screen of maximum opening 100%;

(2) do not start temperature control box, tested reinforcing LCD MODULE demonstration is a white picture entirely, closes the door of temperature control box, the glass window front brightness of screen of the tested reinforcing LCD MODULE of chroma luminance instrumentation amount central point that sees through temperature control box, obtain the front brightness value of the second screen, be designated as L ₁₀₀'; Take the brightness picture that tested reinforcing LCD MODULE shows with CCD by the glass window on the temperature control chamber door, the brightness value that obtains the center picture point of CCD shooting is designated as G ₁₀₀

(3) the liquid crystal pixel aperture of the tested reinforcing LCD MODULE of change, make it be respectively 80%, 60%, 40%, 20% and 0% of maximum opening, under every kind of brightness conditions, respectively repeat steps (1) and (2), obtain respectively one group of first front brightness value of screen and be designated as respectively L ₈₀, L ₆₀, L ₄₀, L ₂₀, L ₀Brightness value is designated as respectively L before one group of second screen ₈₀', L ₆₀', L ₄₀', L ₂₀', L ₀'; The brightness of one picture group sheet central point is designated as respectively G ₈₀, G ₆₀, G ₄₀, G ₂₀, G ₀

(4) with L ₁₀₀, L ₈₀, L ₆₀, L ₄₀, L ₂₀, L ₀And L ₁₀₀', L ₈₀', L ₆₀', L ₄₀', L ₂₀', L ₀The following formula 1 of ' substitution and formula 2 calculate k ₁And b ₁, obtain directly to measure brightness L before the screen of tested reinforcing LCD MODULE and see through relation equation between the front brightness L ' of screen of the tested reinforcing LCD MODULE that the glass window on the temperature control chamber door measures, as shown in Equation 3;

$k_1=\frac{\mathrm{N\Σ}{L}_i^{\′}{L}_i-\mathrm{\Σ}{L^{\′}}_i\mathrm{\Σ}{L}_i}{\mathrm{N\Σ}{L}_i^{\′2}-{\left(\mathrm{\Σ}{L^{\′}}_2\right)}^2},$ i＝100,80,60,40,20,0 （1）

$b_1=\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{L}_i}{N}-a\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{L^{\′}}_i}{N},$ i＝100,80,60,40,20,0 （2）

L=k ₁L′+b ₁ （3）

In the formula, N is the sample number, is 6 herein.k ₁Be the slope of fitting a straight line between L and the L ', k ₁Value is 0～1, b ₁Be the zero point of fitting a straight line between L and the L ', b ₁Without fixed range;

(5) with L ₁₀₀', L ₈₀', L ₆₀', L ₄₀', L ₂₀', L ₀' and G ₁₀₀, G ₈₀, G ₆₀, G ₄₀, G ₂₀, G ₀The following formula 4 of substitution and formula 5 calculate k ₂And b ₂To see through brightness L ' before the screen of the tested reinforcing LCD MODULE that the glass window on the temperature control chamber door measures and see through relation equation between the center picture brightness G of tested reinforcing LCD MODULE of the glass window shooting on the temperature control chamber door with high sensitivity camera (CCD), as shown in Equation 6

$k_2\text{=}\frac{\mathrm{N\Σ}{G}_i{L}_i^{\′}-\mathrm{\Σ}{G}_i\mathrm{\Σ}{L^{\′}}_i}{\mathrm{N\Σ}{G}_i^2-{\left(\mathrm{\Σ}{G}_i\right)}^2},$ i＝100,80,60,40,20,0 （4）

$b_2=\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{L^{\′}}_i}{N}-a\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{G}_i}{N},$ i＝100,80,60,40,20,0 （5）

L′=k ₂G+b ₂ （6）

In the formula, N is the sample number, is 6 herein; K ₂Be the slope of fitting a straight line between L ' and the G, k ₂Value is 0～1, b ₂Be the zero point of fitting a straight line between L ' and the G, b ₂Without fixed range;

(6) close the door of temperature control box, open tested reinforcing LCD MODULE power switch, show a complete white picture, with the programming rate that is not higher than 1 ℃/minute temperature control the temperature inside the box is raised to 60 ℃, insulation is no less than 60 minutes; Take the viewing area of tested reinforcing LCD MODULE with the glass window that high sensitivity camera (CCD) sees through on the temperature control chamber door, obtain the Pic that Shows Picture of tested reinforcing LCD MODULE under the high temperature ₆₅

(7) with Pic ₆₅Import among the data processing software Matlab and process, obtain the Pic that Shows Picture of tested reinforcing LCD MODULE under the high temperature ₆₅Each pixel high temperature brightness G _{I, j}, wherein, i and j are display resolution; With G _{I, j}Bring above-mentioned formula 6 into, obtain seeing through brightness L before each pixel high temperature screen of tested reinforcing LCD MODULE of glass window of temperature control box _{I, j}';

(8) will be through brightness L before each pixel high temperature screen of the tested reinforcing LCD MODULE of the glass window of temperature control box _{I, j}The above-mentioned formula 3 of ' substitution, brightness L before the high temperature screen of tested each pixel of reinforcing LCD MODULE of directly being measured _{I, j}

(9) calculate respectively reinforcing LCD MODULE center brightness L under the hot environment _Center, reinforce 9 homogeneity P of LCD MODULE under the hot environment ₉, specific formula for calculation is as follows:

$L_{\mathrm{center}}=\frac{\underset{i=\frac{M}{2}-8}{\overset{i=\frac{M}{2}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{2}-8}{\overset{j=\frac{N}{2}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16},$ i＝1~16,j＝1~16 （7）

$P_9=\frac{\frac{\underset{i=\frac{M}{4}-8}{\overset{i=\frac{M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{4}-8}{\overset{j=\frac{N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{4}-8}{\overset{i=\frac{2M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{4}-8}{\overset{j=\frac{N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{4}-8}{\overset{i=\frac{3M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{4}-8}{\overset{j=\frac{N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{9}$

$+\frac{\frac{\underset{i=\frac{M}{4}-8}{\overset{i=\frac{M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{2N}{4}-8}{\overset{j=\frac{2N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{4}-8}{\overset{i=\frac{2M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{2N}{4}-8}{\overset{j=\frac{2N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{4}-8}{\overset{i=\frac{3M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{2N}{4}-8}{\overset{j=\frac{2N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{9},$ i＝1~16,j＝1~16

$+\frac{\frac{\underset{i=\frac{M}{4}-8}{\overset{i=\frac{M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{3N}{4}-8}{\overset{j=\frac{3N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{4}-8}{\overset{i=\frac{2M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{3N}{4}-8}{\overset{j=\frac{3N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{4}-8}{\overset{i=\frac{3M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{3N}{4}-8}{\overset{j=\frac{3N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{9}---\left(8\right)$

Calculate reinforcing LCD MODULE center brightness L under the hot environment according to above-mentioned formula (7) _Center, calculate 9 homogeneity P of reinforcing LCD MODULE under the hot environment according to above-mentioned formula (8) ₉The light characteristic index;

In formula (7) and the formula (8), M and N are the display resolutions of tested reinforcing LCD MODULE.

2. calculate and reinforce 25 homogeneity P of LCD MODULE under the hot environment ₂₅The light characteristic index; Specific formula for calculation is as follows:

$P_{25}=\frac{\frac{\underset{i=\frac{M}{6}-8}{\overset{i=\frac{M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{6}-8}{\overset{j=\frac{N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{6}-8}{\overset{i=\frac{2M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{6}-8}{\overset{j=\frac{N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{6}-8}{\overset{i=\frac{3M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{6}-8}{\overset{j=\frac{N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{4M}{6}-8}{\overset{i=\frac{4M+8}{6}}{\mathrm{\Σ}}}\underset{i=\frac{N}{6}-8}{\overset{j=\frac{N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{5M}{6}-8}{\overset{i=\frac{5M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{6}-8}{\overset{j=\frac{N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{25}$

$+\frac{\frac{\underset{i=\frac{M}{6}-8}{\overset{i=\frac{M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{2N}{6}-8}{\overset{j=\frac{2N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{6}-8}{\overset{i=\frac{2M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{2N}{6}-8}{\overset{j=\frac{2N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{6}-8}{\overset{i=\frac{3M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{2N}{6}-8}{\overset{j=\frac{2N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{4M}{6}-8}{\overset{i=\frac{4M+8}{6}}{\mathrm{\Σ}}}\underset{i=\frac{2N}{6}-8}{\overset{j=\frac{2N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{5M}{6}-8}{\overset{i=\frac{5M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{2N}{6}-8}{\overset{j=\frac{2N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{25}$

$+\frac{\frac{\underset{i=\frac{M}{6}-8}{\overset{i=\frac{M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{3N}{6}-8}{\overset{j=\frac{3N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{6}-8}{\overset{i=\frac{2M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{3N}{6}-8}{\overset{j=\frac{3N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{6}-8}{\overset{i=\frac{3M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{3N}{6}-8}{\overset{j=\frac{3N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{4M}{6}-8}{\overset{i=\frac{4M+8}{6}}{\mathrm{\Σ}}}\underset{i=\frac{3N}{6}-8}{\overset{j=\frac{3N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{5M}{6}-8}{\overset{i=\frac{5M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{3N}{6}-8}{\overset{j=\frac{3N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{25}$

$+\frac{\frac{\underset{i=\frac{M}{6}-8}{\overset{i=\frac{M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{4N}{6}-8}{\overset{j=\frac{4N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{6}-8}{\overset{i=\frac{2M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{4N}{6}-8}{\overset{j=\frac{4N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{6}-8}{\overset{i=\frac{3M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{4N}{6}-8}{\overset{j=\frac{4N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{4M}{6}-8}{\overset{i=\frac{4M+8}{6}}{\mathrm{\Σ}}}\underset{i=\frac{4N}{6}-8}{\overset{j=\frac{4N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{5M}{6}-8}{\overset{i=\frac{5M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{4N}{6}-8}{\overset{j=\frac{4N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{25}$

$+\frac{\frac{\underset{i=\frac{M}{6}-8}{\overset{i=\frac{M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{5N}{6}-8}{\overset{j=\frac{5N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{6}-8}{\overset{i=\frac{2M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{5N}{6}-8}{\overset{j=\frac{5N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{6}-8}{\overset{i=\frac{3M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{5N}{6}-8}{\overset{j=\frac{5N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{4M}{6}-8}{\overset{i=\frac{4M+8}{6}}{\mathrm{\Σ}}}\underset{i=\frac{5N}{6}-8}{\overset{j=\frac{5N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{5M}{6}-8}{\overset{i=\frac{5M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{5N}{6}-8}{\overset{j=\frac{5N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{25}$

,i＝1~16,j＝1~16

（9）

Obtain reinforcing under the hot environment 25 homogeneity P of LCD MODULE according to above-mentioned formula (9) ₂₅In the formula (9), M and N are the display resolutions of tested reinforcing LCD MODULE.

Beneficial effect of the present invention is: a kind of measuring method of reinforcing display brightness under the display module hot environment is provided.Because the optical devices such as chroma luminance meter, high sensitivity camera (CCD) can't be operated in the hot environment, therefore this measuring method is put into hot environment with tested reinforcing LCD MODULE, and the optical test equipments such as chroma luminance meter, CCD are placed in the normal temperature environment.By twice calibration process, set up (1) CCD pictures taken brightness and seen through relation equation between the reinforcing liquid crystal display mode Block Brightness that glass window measures; (2) see through the relation equation of the display brightness that glass window measures and the display brightness that directly measures.By being in the tested reinforcing LCD MODULE display frame under the CCD shooting hot environment under the normal temperature, utilize 2 relation equations just can calculate and derive the front brightness of the screen of reinforcing LCD MODULE under the hot environment.Adopt this measuring method that the display brightness of reinforcing under the LCD MODULE hot environment is measured, the testing apparatus that only needs use manufacturing enterprise generally to have, do not need to drop into substantial contribution and buy extra testing apparatus, measuring method is simple, and measurement result accurately and reliably.Do not change in the situation of temperature control box, chroma luminance meter, high sensitivity camera, after only calibration process of needs obtains 2 relation equations, just can measure a plurality of reinforcing LCD MODULE, do not need again to demarcate.Facts have proved, according to this measuring method the display brightness of the reinforcing LCD MODULE under the hot environment is measured, and carry out the whether qualified judgement of product according to measurement result, can not only successfully check out the unacceptable product that human eye is judged, and can check out that the human eye that circulates for the first time judges qualified and just occur the unacceptable product of display dot through several times circulation, its product qualification determination accuracy rate is apparently higher than the subjective judgement of human eye.

Description of drawings

Fig. 1 reinforces the LCD MODULE schematic diagram.

Fig. 2 is that the chroma luminance meter is directly measured reinforcing LCD MODULE Strehl ratio.

Fig. 3 is that the glass window that the chroma luminance meter sees through on the temperature control chamber door is measured reinforcing LCD MODULE Strehl ratio.

Fig. 4 is that the glass window that CCD sees through on the temperature control chamber door is taken the reinforcing LCD MODULE.

Fig. 5 is that CCD sees through glass window on the temperature control chamber door and take to reinforce the different brightness of LCD MODULE and Show Picture.

Fig. 6 reinforces 9 distribution plans of LCD MODULE brightness measurement.

Fig. 7 reinforces 25 distribution plans of LCD MODULE brightness measurement.

Embodiment

Below in conjunction with embodiment, the present invention is done to describe further.

Embodiment 1

For ease of understanding the present invention, at first the structure of reinforcing LCD MODULE is simply introduced.Referring to Fig. 1, the common liquid crystals screen comprises the liquid crystal material of liquid crystal display upper and lower base plate and middle can.Because the optical activity of liquid crystal molecule enters liquid crystal cell after the luminous light of backlight need to become polarized light through rear polarizer.Only have with front polaroid polarization direction light always and just can reach human eye.When the common liquid crystals screen is reinforced, adopt optical cement will reinforce the upper substrate that glass bonds to liquid crystal display.Reinforce glass and have the function of anti-reflection, electromagnetic screen.

Because the optical test equipments such as chroma luminance meter, high sensitivity camera (CCD) can't be worked in hot environment, therefore this measuring method is put into hot environment (temperature control box) with tested reinforcing LCD MODULE, and the optical test equipments such as chroma luminance meter, CCD are placed in the normal temperature environment, measure the glass window that sees through on the temperature control chamber door and finish.

See also Fig. 2.Tested reinforcing LCD MODULE is put on the temperature control box support, opened the door of temperature control box.Open and reinforce the LCD MODULE power switch, the adjustable liquid crystal display screen drives signal, produce the brightness of red, green, blue sub-pixel and be respectively (255,255,255) signal, this moment, the liquid crystal pixel aperture was 100%, and tested reinforcing LCD MODULE shows a complete white picture, and brightness is maximal value (100%) before the screen.The chroma luminance meter is fixed on the tripod, adjust the tripod position, make chroma luminance meter measurement point aim at the central point of reinforcing LCD MODULE, directly measure brightness before the screen of tested reinforcing LCD MODULE central point with the chroma luminance meter, obtain display brightness and be brightness before 100% the screen, be designated as L ₁₀₀, L ₁₀₀=965.43nit.Change liquid crystal display and drive signal, produce the signal that the brightness of red, green, blue sub-pixel is respectively (255 * 0.8,255 * 0.8,255 * 0.8), this moment, the liquid crystal pixel aperture was 80%, and this moment, tested reinforcing LCD MODULE display brightness was peaked 80%.Directly measure brightness before the screen of tested reinforcing LCD MODULE central point with the chroma luminance meter, obtain display brightness and be brightness before 80% the screen, be designated as L ₈₀, L ₈₀=779.84nit.Repeat as above step, change respectively liquid crystal display and drive signal, make the brightness of red, green, blue sub-pixel be respectively 60%, 40%, 20% and 0% of maximal value 255, this moment, the liquid crystal pixel aperture was respectively peaked 60%, 40%, 20% and 0%, generation brightness is respectively 60%, 40%, 20% and 0% display frame, directly measure brightness before the tested reinforcing LCD MODULE central point screen with the chroma luminance meter, brightness value L before the screen of 60% brightness that obtains opening the door ₆₀, L ₆₀Brightness value L before the screen of=565.97nit, 40% brightness of opening the door ₄₀, L ₄₀Brightness value L before the screen of=393.01nit, 20% brightness of opening the door ₂₀, L ₂₀Brightness value L before the screen of=191.90nit, 0% brightness of opening the door ₀, L ₀=0.812nit, with the measurement data record of chroma luminance meter, as shown in table 1.

Table 1

	100%	80%	60%	40%	20%	0%
							L(nit)	965.43	779.84	565.97	393.01	191.90	0.812

See also Fig. 3, tested reinforcing LCD MODULE is put on the temperature control box support, open tested reinforcing LCD MODULE power switch, the adjustable liquid crystal display screen drives signal, produces the brightness of red, green, blue sub-pixel and is respectively (255,255,255) signal, this moment, the liquid crystal pixel aperture was 100%, and tested reinforcing LCD MODULE shows a complete white picture, and brightness is maximal value (100%) before the screen.Close the door of temperature control box, do not start temperature control box.The chroma luminance meter is fixed on the tripod, adjust the tripod position, make chroma luminance meter measurement point aim at the central point of reinforcing LCD MODULE, directly measure brightness before the screen of tested reinforcing LCD MODULE central point with the chroma luminance meter, obtain seeing through display brightness that windowpane measures and be brightness before 100% the screen, be designated as L ₁₀₀', L ₁₀₀'=586.20nit.Change liquid crystal display and drive signal, produce the signal that the brightness of red, green, blue sub-pixel is respectively (255 * 0.8,255 * 0.8,255 * 0.8), this moment, the liquid crystal pixel aperture was 80%, and this moment, tested reinforcing LCD MODULE display brightness was peaked 80%.See through windowpane on the temperature control chamber door with the chroma luminance meter and measure brightness before the screen of tested reinforcing LCD MODULE central point, obtain seeing through display brightness that windowpane measures and be brightness before 80% the screen, be designated as L ₈₀', L ₈₀'=460.17nit.Repeat as above step, change respectively liquid crystal display and drive signal, make the brightness of red, green, blue sub-pixel be respectively 60%, 40%, 20% and 0% of maximal value 255, this moment, the liquid crystal pixel aperture was respectively peaked 60%, 40%, 20% and 0%, generation brightness is respectively 60%, 40%, 20% and 0% display frame, see through glass window on the temperature control chamber door with the chroma luminance meter and measure brightness before the tested reinforcing LCD MODULE central point screen, brightness value L before the screen of 60% brightness that obtains closing the door ₆₀', L ₆₀Brightness value L before the screen of '=345.98nit, 40% brightness of closing the door ₄₀', L ₄₀Brightness value L before the screen of '=228.56nit, 20% brightness of closing the door ₂₀', L ₂₀Brightness value L before the screen of '=123.57nit, 0% brightness of closing the door ₀', L ₀'=0.688nit, with the measurement data record of chroma luminance meter, as shown in table 2.

Table 2

	100%	80%	60%	40%	20%	0%
							L′(nit)	586.20	460.17	345.98	228.56	123.57	0.688

See also Fig. 4, tested reinforcing LCD MODULE is put on the temperature control box support, open tested reinforcing LCD MODULE power switch, the adjustable liquid crystal display screen drives signal, produces the brightness of red, green, blue sub-pixel and is respectively (255,255,255) signal, this moment, the liquid crystal pixel aperture was 100%, and this moment, tested reinforcing LCD MODULE showed a complete white picture, and brightness is maximal value (100%) before the screen.Close the door of temperature control box, do not start temperature control box.CCD is placed on the tripod, with the glass window on the as far as possible close temperature control chamber door in the position of tripod, ensures that CCD can the complete display frame that photographs tested reinforcing LCD MODULE.Take the complete white picture that tested reinforcing LCD MODULE shows with the glass window that CCD sees through on the temperature control chamber door.Obtain the picture of Fig. 6 (a).Change liquid crystal display and drive signal, produce the signal that the brightness of red, green, blue sub-pixel is respectively (255 * 0.8,255 * 0.8,255 * 0.8), this moment, the liquid crystal pixel aperture was 80%, and this moment, tested reinforcing LCD MODULE display brightness was peaked 80%.Take the 80% brightness picture that tested reinforcing LCD MODULE shows with the glass window that CCD sees through on the temperature control chamber door.Obtain the picture of Fig. 6 (b).Repeat as above step, change respectively liquid crystal display and drive signal, make the brightness of red, green, blue sub-pixel be respectively 60%, 40%, 20% and 0% of maximal value 255, this moment, the liquid crystal pixel aperture was respectively peaked 60%, 40%, 20% and 0%, generation brightness is respectively 60%, 40%, 20% and 0% display frame, take the brightness picture that tested reinforcing LCD MODULE shows with the glass window that CCD sees through on the temperature control chamber door, obtain Fig. 5 (c) to the picture of Fig. 5 (f).

Picture among Fig. 5 (a) is imported among the large data process software Matlab of MathWorkshop company product to (f), read respectively the brightness value of central point, be designated as the CCD brightness value G of 100% brightness of closing the door ₁₀₀, G ₁₀₀=237, the close the door CCD brightness value G of 80% brightness ₈₀, G ₈₀=184, the close the door CCD brightness value G of 60% brightness ₆₀, G ₆₀=140, the close the door CCD brightness value G of 40% brightness ₄₀, G ₄₀=95, the close the door CCD brightness value G of 20% brightness ₂₀, G ₂₀=49, the close the door CCD brightness value G of 0% brightness ₀, G ₀=1, as shown in table 3.

Table 3

	100%	80%	60%	40%	20%	0%
							G	237	184	140	95	49	1

With the data substitution following formula in table 2 and the table 3 (formula (4) and formula (5)), obtain k ₂And b ₂

$k_2=\frac{\mathrm{N\Σ}{G}_i{L}_i^{\′}-\mathrm{\Σ}{G}_i\mathrm{\Σ}{L^{\′}}_i}{\mathrm{N\Σ}{G}_i^2-{\left(\mathrm{\Σ}{G}_i\right)}^2},$ i＝100,80,60,40,20,0

$b_2=\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{L^{\′}}_i}{N}-a\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{G}_i}{N},$ i＝100,80,60,40,20,0

Thereby obtain seeing through reinforcing LCD MODULE Strehl ratio L ' that the glass window on the temperature control chamber door measures and CCD and see through Show Picture relation equation between the brightness G of reinforcing LCD MODULE that the glass window on the temperature control chamber door takes, be shown below:

L′=2.4932G-1.8633 （10）

With the data substitution following formula in table 1 and the table 2 (formula (1) and formula (2)), obtain k ₁And b ₁

$k_1=\frac{\mathrm{N\Σ}{L}_i^{\′}{L}_i-\mathrm{\Σ}{L^{\′}}_i\mathrm{\Σ}{L}_i}{\mathrm{N\Σ}{L}_i^{\′2}-{\left(\mathrm{\Σ}{L^{\′}}_2\right)}^2},$ i＝100,80,60,40,20,0

$b_1=\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{L}_i}{N}-a\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{L^{\′}}_i}{N},$ i＝100,80,60,40,20,0

Thereby the relation equation before obtaining seeing through the reinforcing LCD MODULE Strehl ratio L ' of the glass window measurement on the temperature control chamber door and directly measuring tested reinforcing LCD MODULE screen between the brightness L is shown below:

L=1.6680L′-2.3299 （11）

Tested reinforcing LCD MODULE is put on the temperature control box support, open tested reinforcing LCD MODULE power switch, the adjustable liquid crystal display screen drives signal, produce the brightness of red, green, blue sub-pixel and be respectively (255,255,255) signal, this moment, the liquid crystal pixel aperture was 100%, tested reinforcing LCD MODULE shows a complete white picture.Close the door of temperature control box, start temperature control box, the control temperature control box is raised to 60 ℃ with temperature control the temperature inside the box by room temperature with the programming rate that is not higher than 1 ℃/minute, and insulation is no less than 60 minutes.Take the viewing area of tested reinforcing LCD MODULE with the glass window that CCD sees through on the temperature control chamber door, obtain reinforcing under the high temperature Pic that Shows Picture of LCD MODULE _1-65

Pic will Show Picture _1-65Import among the large data process software Matlab of MathWorkshop company product, read the brightness value of each pixel, the reinforcing LCD MODULE as for 1024 * 768 resolution will obtain 1024 * 768 data G _{I, j}Not (i=1-1024, j=1-768) (overabundance of data is not listed one by one).With G _{I, j}Substitution formula 10 obtains each the pixel high temperature brightness L through the tested reinforcing LCD MODULE behind the glass window on the temperature control chamber door _{I, j}'; With L _{I, j}' substitution formula 11, the high temperature that can directly be measured tested each pixel of reinforcing display module display frame shields front brightness L _{I, j}

Consider that using the brightness of chroma luminance instrumentation amount is the mean value of brightness in the certain area, therefore need to shield preceding pixel brightness L to high temperature _{I, j}Process, to obtain brightness value in the certain area identical with chroma luminance instrumentation amount principle.For brightness before the central point screen, get the mean value of central area 16 * 16 pixels as the center brightness value.Pixel resolution for 1024 * 768, i=1024 in formula (7), formula (8), the formula (9), j=768 is shown below.

$L_{\mathrm{center}}=\frac{\underset{i=\frac{1024}{2}-8}{\overset{i=\frac{1024}{2}+8}{\mathrm{\Σ}}}\underset{j=\frac{768}{2}-8}{\overset{j=\frac{768}{2}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}---\left(12\right)$

Can obtain center brightness L according to formula 12 _CenterBe 844.29nit.

See also 9 distribution plans of reinforcing LCD MODULE brightness measurement of Fig. 6.Wherein first brightness calculation is shown below.The calculating of other points is identical, repeats no more.Obtain reinforcing 9 brightness values of LCD MODULE brightness measurement, as shown in table 4.

$L_1=\frac{\underset{i=\frac{1024}{4}-8}{\overset{i=\frac{1024}{4}+8}{\mathrm{\Σ}}}\underset{i=\frac{768}{4}-8}{\overset{j=\frac{768}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}---\left(13\right)$

Table 4

With data substitution following formula in the table 4, can obtain 9 brightness homogeneity P ₉

$P_9=1-\frac{L_{\max }-L_{\min }}{L_{\mathrm{center}}}=1-\frac{844.29-697.13}{844.29}=82.57\%---\left(14\right)$

For some product of having relatively high expectations, manufacturing enterprise adopts 25 point measurement methods to estimate homogeneity.See also 25 distribution plans of reinforcing LCD MODULE brightness measurement of Fig. 7.Wherein first brightness calculation is shown below.The calculating of other points is identical, repeats no more.Obtain reinforcing 25 brightness values of LCD MODULE brightness measurement, as shown in table 5.

$L_1=\frac{\underset{i=\frac{1024}{6}-8}{\overset{i=\frac{1024}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{768}{6}-8}{\overset{j=\frac{768}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}---\left(15\right)$

Table 5

Data substitution formula 9 in the table 5 can be obtained 25 brightness homogeneity P ₂₅

$P_{25}=1-\frac{L_{\max }-L_{\min }}{L_{\mathrm{center}}}=1-\frac{857.21-671.81}{857.21}=78.37\%---\left(16\right)$

Can find out, display centre brightness reaches 884.29nit under the reinforcing LCD MODULE hot environment, and 25 show uniformities are 78.37%, illustrate that display performance is good under this product hot environment, reach criterion of acceptability.

Embodiment 2

Use temperature control box, chroma luminance meter, the high sensitivity camera identical with embodiment 1.Embodiment 1 has been finished demarcation, has obtained the relation equation of formula 10 and formula 11.Embodiment 2 does not need again to demarcate, and directly utilizes formula 10 and formula 11 to get final product.

Tested reinforcing LCD MODULE is put on the temperature control box support, open tested reinforcing LCD MODULE power switch, the adjustable liquid crystal display screen drives signal, produce the brightness of red, green, blue sub-pixel and be respectively (255,255,255) signal, this moment, the liquid crystal pixel aperture was 100%, tested reinforcing LCD MODULE shows a complete white picture.Close the door of temperature control box, start temperature control box, the control temperature control box is raised to 60 ℃ with temperature control the temperature inside the box by room temperature with the programming rate that is not higher than 1 ℃/minute, and insulation is no less than 60 minutes.Take the viewing area of tested reinforcing LCD MODULE with the glass window that CCD sees through on the temperature control chamber door, obtain the Pic that Shows Picture of tested reinforcing LCD MODULE under the high temperature _2-65

Pic will Show Picture _2-65Import among the data processing software Matlab, take the disposal route (repeat no more) the same with embodiment 1, obtain center brightness L _CenterBe 864.68nit.

Take the disposal route the same with embodiment 1, obtain 9 brightness values, such as table 6.Substitution formula 8 can obtain 9 brightness homogeneity P ₉

Table 6

$P_9=1-\frac{L_{\max }-L_{\min }}{L_{\mathrm{center}}}=1-\frac{864.68-560.34}{864.68}=64.80\%---\left(17\right)$

Take the disposal route the same with embodiment 1, obtain 25 brightness values, such as table 7.Substitution formula 9 can obtain 25 brightness homogeneity P ₂₅Table 7

$P_{25}=1-\frac{L_{\max }-L_{\min }}{L_{\mathrm{center}}}=1-\frac{861.07-556.18}{861.07}=64.59\%---\left(18\right)$

Can find out, display centre brightness reaches 864.68nit under the tested reinforcing LCD MODULE hot environment, and show uniformity is lower than 75%, and the variation that occurs display performance under the tested reinforcing LCD MODULE hot environment is described, do not meet criterion of acceptability, the processing of scrapping or do over again of this product needed.

Embodiment 3

Compare with embodiment 1, adopted the temperature control box of different model, chroma luminance meter and high sensitivity camera still adopt the model of embodiment 1.Need to again implement calibration process.

Take the step identical with embodiment 1, adjust tested reinforcing LCD MODULE display brightness and be respectively 100%, 80%, 60%, 40%, 20%, 0%, the door that obtains respectively to open temperature control box with the chroma luminance meter directly measure brightness L before the screen of tested reinforcing LCD MODULE center, the door of closing temperature control box sees through the center brightness G that glass window is measured tested reinforcing LCD MODULE center brightness L ', the door of closing temperature control box is taken tested reinforcing LCD MODULE picture through glass window with the high sensitivity camera with the chroma luminance meter, and is as shown in table 8.

Table 8

	100%	80%	60%	40%	20%	0%
							L（nit）	965.43	779.84	565.97	393.01	191.90	0.92
L′（nit）	624.79	490.01	376.68	255.12	134.56	0.60
							G	240	188	146	99	52	1

With L ' in the table 8 and G substitution following formula (formula (4) and formula (5)), obtain k ₂And b ₂

$k_2\text{=}\frac{\mathrm{N\Σ}{G}_i{L}_i^{\′}-\mathrm{\Σ}{G}_i\mathrm{\Σ}{L^{\′}}_i}{\mathrm{N\Σ}{G}_i^2-{\left(\mathrm{\Σ}{G}_i\right)}^2},$ i＝100,80,60,40,20,0

$b_2=\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{L^{\′}}_i}{N}-a\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{G}_i}{N},$ i＝100,80,60,40,20,0

Thereby obtain seeing through reinforcing LCD MODULE Strehl ratio L ' that the glass window on the temperature control chamber door measures and CCD and see through Show Picture relation equation between the brightness G of reinforcing LCD MODULE that the glass window on the temperature control chamber door takes, be shown below:

L′=2.6076G-2.0311 （19）

With L in the table 8 and L ' substitution following formula (formula (1) and formula (2)), obtain k ₁And b ₁

$k_1=\frac{\mathrm{N\Σ}{L}_i^{\′}{L}_i-\mathrm{\Σ}{L^{\′}}_i\mathrm{\Σ}{L}_i}{\mathrm{N\Σ}{L}_i^{\′2}-{\left(\mathrm{\Σ}{L^{\′}}_2\right)}^2},$ i＝100,80,60,40,20,0

$b_1=\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{L}_i}{N}-a\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{L^{\′}}_i}{N},$ i＝100,80,60,40,20,0

Thereby the relation equation before obtaining seeing through the reinforcing LCD MODULE Strehl ratio L ' of the glass window measurement on the temperature control chamber door and directly measuring tested reinforcing LCD MODULE screen between the brightness L is shown below:

L=1.5493L′-1.5923 （20）

Tested reinforcing LCD MODULE is put on the temperature control box support, open tested reinforcing LCD MODULE power switch, the adjustable liquid crystal display screen drives signal, produce the brightness of red, green, blue sub-pixel and be respectively (255,255,255) signal, this moment, the liquid crystal pixel aperture was 100%, tested reinforcing LCD MODULE shows a complete white picture.Close the door of temperature control box, start temperature control box, the control temperature control box is raised to 60 ℃ with temperature control the temperature inside the box by room temperature with the programming rate that is not higher than 1 ℃/minute, and insulation is no less than 60 minutes.Take the viewing area of tested reinforcing LCD MODULE with the glass window that CCD sees through on the temperature control chamber door, obtain the Pic that Shows Picture of tested reinforcing LCD MODULE under the high temperature _3-65

Pic will Show Picture _3-65Import among the data processing software Matlab, take the disposal route (repeat no more) the same with embodiment 1, obtain center brightness L _CenterBe 876.46nit.

Take the disposal route the same with embodiment 1, obtain 9 brightness values, such as table 9.Substitution formula 8 can obtain 9 brightness homogeneity P ₉Table 9

$P_9=1-\frac{L_{\max }-L_{\min }}{L_{\mathrm{center}}}=1-\frac{.876.68-702.02}{876.68}=80.08\%---\left(21\right)$

Take the disposal route the same with embodiment 1, obtain 25 brightness values, such as table 10.Substitution formula 9 can obtain 25 brightness homogeneity P ₂₅

Table 10

$P_{25}=1-\frac{L_{\max }-L_{\min }}{L_{\mathrm{center}}}=1-\frac{866.10-687.01}{866.10}=79.32\%---\left(22\right)$

Can find out, display centre brightness reaches 876.46nit under this tested reinforcing LCD MODULE hot environment, and show uniformity is higher than 75%, illustrates that display performance is good under this tested reinforcing LCD MODULE hot environment, reaches criterion of acceptability.

Claims (2)

1. reinforce the measuring method of LCD MODULE display brightness under hot environment, it is characterized in that: measure device therefor and comprise temperature control box, chroma luminance meter and high sensitivity camera (CCD); The door of described temperature control box is provided with glass window, tested reinforcing LCD MODULE is placed on the inside of temperature control box, and chroma luminance meter and high sensitivity camera (CCD) are positioned at the outside of temperature control box;

(1) do not start temperature control box, open the door of temperature control box, open tested reinforcing LCD MODULE power switch, show a complete white picture, directly measure brightness before the screen of tested reinforcing LCD MODULE central point with the chroma luminance meter, obtain brightness value before the first screen, be designated as L ₁₀₀, index number wherein represents to shield front brightness, described L ₁₀₀In index number represent brightness before the liquid crystal pixel aperture is for maximum 100% screen;

(2) do not start temperature control box, tested reinforcing LCD MODULE demonstration is a white picture entirely, closes the door of temperature control box, the glass window front brightness of screen of the tested reinforcing LCD MODULE of chroma luminance instrumentation amount central point that sees through temperature control box, obtain the front brightness value of the second screen, be designated as L ₁₀₀'; Take the brightness picture that tested reinforcing LCD MODULE shows with CCD by the glass window on the temperature control chamber door, the brightness value that obtains the center picture point of CCD shooting is designated as G ₁₀₀

(3) the liquid crystal pixel aperture of the tested reinforcing LCD MODULE of change, make it be respectively 80%, 60%, 40%, 20% and 0% of maximum opening, under every kind of brightness conditions, respectively repeat steps (1) and (2), obtain respectively one group of first front brightness value of screen and be designated as respectively L ₈₀, L ₆₀, L ₄₀, L ₂₀, L ₀Brightness value is designated as respectively L before one group of second screen ₈₀', L ₆₀', L ₄₀', L ₂₀', L ₀'; The brightness of one picture group sheet central point is designated as respectively G ₈₀, G ₆₀, G ₄₀, G ₂₀, G ₀

(4) with L ₁₀₀, L ₈₀, L ₆₀, L ₄₀, L ₂₀, L ₀And L ₁₀₀', L ₈₀', L ₆₀', L ₄₀', L ₂₀', L ₀The following formula 1 of ' substitution and formula 2 calculate k ₁And b ₁, obtain directly to measure brightness L before the screen of tested reinforcing LCD MODULE and see through relation equation between the front brightness L ' of screen of the tested reinforcing LCD MODULE that the glass window on the temperature control chamber door measures, as shown in Equation 3;

$k_1=\frac{\mathrm{N\Σ}{L}_i^{\′}{L}_i-\mathrm{\Σ}{L^{\′}}_i\mathrm{\Σ}{L}_i}{\mathrm{N\Σ}{L}_i^{\′2}-{\left(\mathrm{\Σ}{L^{\′}}_2\right)}^2},$ i＝100,80,60,40,20,0 （1）

$b_1=\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{L}_i}{N}-a\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{L^{\′}}_i}{N},$ i＝100,80,60,40,20,0 （2）

L=k ₁L′+b ₁ （3）

In the formula, N is the sample number, is 6 herein.k ₁Be the slope of fitting a straight line between L and the L ', k ₁Value is 0～1, b ₁Be the zero point of fitting a straight line between L and the L ', b ₁Without fixed range;

(5) with L ₁₀₀', L ₈₀', L ₆₀', L ₄₀', L ₂₀', L ₀' and G ₁₀₀, G ₈₀, G ₆₀, G ₄₀, G ₂₀, G ₀The following formula 4 of substitution and formula 5 calculate k ₂And b ₂To see through brightness L ' before the screen of the tested reinforcing LCD MODULE that the glass window on the temperature control chamber door measures and see through relation equation between the center picture brightness G of tested reinforcing LCD MODULE of the glass window shooting on the temperature control chamber door with high sensitivity camera (CCD), as shown in Equation 6

$k_2\text{=}\frac{\mathrm{N\Σ}{G}_i{L}_i^{\′}-\mathrm{\Σ}{G}_i\mathrm{\Σ}{L^{\′}}_i}{\mathrm{N\Σ}{G}_i^2-{\left(\mathrm{\Σ}{G}_i\right)}^2},$ i＝100,80,60,40,20,0 （4）

$b_2=\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{L^{\′}}_i}{N}-a\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{G}_i}{N},$ i＝100,80,60,40,20,0 （5）

L′=k ₂G+b ₂ （6）

In the formula, N is the sample number, is 6 herein; K ₂Be the slope of fitting a straight line between L ' and the G, k ₂Value is 0～1, b ₂Be the zero point of fitting a straight line between L ' and the G, b ₂Without fixed range;

(6) close the door of temperature control box, open tested reinforcing LCD MODULE power switch, show a complete white picture, with the programming rate that is not higher than 1 ℃/minute temperature control the temperature inside the box is raised to 60 ℃, insulation is no less than 60 minutes; Take the viewing area of tested reinforcing LCD MODULE with the glass window that high sensitivity camera (CCD) sees through on the temperature control chamber door, obtain the Pic that Shows Picture of tested reinforcing LCD MODULE under the high temperature ₆₅

(7) with Pic ₆₅Import among the data processing software Matlab and process, obtain the Pic that Shows Picture of tested reinforcing LCD MODULE under the high temperature ₆₅Each pixel high temperature brightness G _{I, j}, wherein, i and j are display resolution; With G _{I, j}Bring above-mentioned formula 6 into, obtain seeing through brightness L before each pixel high temperature screen of tested reinforcing LCD MODULE of glass window of temperature control box _{I, j}';

(8) will be through brightness L before each pixel high temperature screen of the tested reinforcing LCD MODULE of the glass window of temperature control box _{I, j}The above-mentioned formula 3 of ' substitution, brightness L before the high temperature screen of tested each pixel of reinforcing LCD MODULE of directly being measured _{I, j}

(9) calculate respectively reinforcing LCD MODULE center brightness L under the hot environment _Center, reinforce 9 homogeneity P of LCD MODULE under the hot environment ₉, specific formula for calculation is as follows:

$L_{\mathrm{center}}=\frac{\underset{i=\frac{M}{2}-8}{\overset{i=\frac{M}{2}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{2}-8}{\overset{j=\frac{N}{2}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16},$ i＝1~16,j＝1~16 （7）

$P_9=\frac{\frac{\underset{i=\frac{M}{4}-8}{\overset{i=\frac{M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{4}-8}{\overset{j=\frac{N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{4}-8}{\overset{i=\frac{2M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{4}-8}{\overset{j=\frac{N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{4}-8}{\overset{i=\frac{3M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{4}-8}{\overset{j=\frac{N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{9}$

$+\frac{\frac{\underset{i=\frac{M}{4}-8}{\overset{i=\frac{M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{2N}{4}-8}{\overset{j=\frac{2N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{4}-8}{\overset{i=\frac{2M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{2N}{4}-8}{\overset{j=\frac{2N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{4}-8}{\overset{i=\frac{3M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{2N}{4}-8}{\overset{j=\frac{2N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{9},$ i＝1~16,j＝1~16

$+\frac{\frac{\underset{i=\frac{M}{4}-8}{\overset{i=\frac{M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{3N}{4}-8}{\overset{j=\frac{3N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{4}-8}{\overset{i=\frac{2M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{3N}{4}-8}{\overset{j=\frac{3N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{4}-8}{\overset{i=\frac{3M}{4}+8}{\mathrm{\Σ}}}\underset{j=\frac{3N}{4}-8}{\overset{j=\frac{3N}{4}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{9}---\left(8\right)$

Calculate reinforcing LCD MODULE center brightness L under the hot environment according to above-mentioned formula (7) _Center, calculate 9 homogeneity P of reinforcing LCD MODULE under the hot environment according to above-mentioned formula (8) ₉The light characteristic index;

In formula (7) and the formula (8), M and N are the display resolutions of tested reinforcing LCD MODULE.

2. the measuring method of described reinforcing LCD MODULE display brightness under hot environment according to claim 1 is characterized in that: calculate and reinforce 25 homogeneity P of LCD MODULE under the hot environment ₂₅The light characteristic index; Specific formula for calculation is as follows:

$P_{25}=\frac{\frac{\underset{i=\frac{M}{6}-8}{\overset{i=\frac{M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{6}-8}{\overset{j=\frac{N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{6}-8}{\overset{i=\frac{2M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{6}-8}{\overset{j=\frac{N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{6}-8}{\overset{i=\frac{3M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{6}-8}{\overset{j=\frac{N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{4M}{6}-8}{\overset{i=\frac{4M+8}{6}}{\mathrm{\Σ}}}\underset{i=\frac{N}{6}-8}{\overset{j=\frac{N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{5M}{6}-8}{\overset{i=\frac{5M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{N}{6}-8}{\overset{j=\frac{N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{25}$

$+\frac{\frac{\underset{i=\frac{M}{6}-8}{\overset{i=\frac{M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{2N}{6}-8}{\overset{j=\frac{2N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{6}-8}{\overset{i=\frac{2M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{2N}{6}-8}{\overset{j=\frac{2N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{6}-8}{\overset{i=\frac{3M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{2N}{6}-8}{\overset{j=\frac{2N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{4M}{6}-8}{\overset{i=\frac{4M+8}{6}}{\mathrm{\Σ}}}\underset{i=\frac{2N}{6}-8}{\overset{j=\frac{2N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{5M}{6}-8}{\overset{i=\frac{5M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{2N}{6}-8}{\overset{j=\frac{2N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{25}$

$+\frac{\frac{\underset{i=\frac{M}{6}-8}{\overset{i=\frac{M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{3N}{6}-8}{\overset{j=\frac{3N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{6}-8}{\overset{i=\frac{2M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{3N}{6}-8}{\overset{j=\frac{3N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{6}-8}{\overset{i=\frac{3M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{3N}{6}-8}{\overset{j=\frac{3N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{4M}{6}-8}{\overset{i=\frac{4M+8}{6}}{\mathrm{\Σ}}}\underset{i=\frac{3N}{6}-8}{\overset{j=\frac{3N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{5M}{6}-8}{\overset{i=\frac{5M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{3N}{6}-8}{\overset{j=\frac{3N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{25}---\left(9\right)$

$+\frac{\frac{\underset{i=\frac{M}{6}-8}{\overset{i=\frac{M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{4N}{6}-8}{\overset{j=\frac{4N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{6}-8}{\overset{i=\frac{2M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{4N}{6}-8}{\overset{j=\frac{4N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{6}-8}{\overset{i=\frac{3M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{4N}{6}-8}{\overset{j=\frac{4N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{4M}{6}-8}{\overset{i=\frac{4M+8}{6}}{\mathrm{\Σ}}}\underset{i=\frac{4N}{6}-8}{\overset{j=\frac{4N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{5M}{6}-8}{\overset{i=\frac{5M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{4N}{6}-8}{\overset{j=\frac{4N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{25}$

$+\frac{\frac{\underset{i=\frac{M}{6}-8}{\overset{i=\frac{M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{5N}{6}-8}{\overset{j=\frac{5N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{2M}{6}-8}{\overset{i=\frac{2M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{5N}{6}-8}{\overset{j=\frac{5N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{3M}{6}-8}{\overset{i=\frac{3M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{5N}{6}-8}{\overset{j=\frac{5N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{4M}{6}-8}{\overset{i=\frac{4M+8}{6}}{\mathrm{\Σ}}}\underset{i=\frac{5N}{6}-8}{\overset{j=\frac{5N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}+\frac{\underset{i=\frac{5M}{6}-8}{\overset{i=\frac{5M}{6}+8}{\mathrm{\Σ}}}\underset{j=\frac{5N}{6}-8}{\overset{j=\frac{5N}{6}+8}{\mathrm{\Σ}}}{L}_{i,j}}{16\×16}}{25}$

,i＝1~16,j＝1~16

Obtain reinforcing under the hot environment 25 homogeneity P of LCD MODULE according to above-mentioned formula (9) ₂₅

In the formula (9), M and N are the display resolutions of tested reinforcing LCD MODULE.

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