On-line brightness correcting and color gamut optimizing method for full-color LED display screen

A technology of LED display and brightness correction, applied in static indicators, instruments, etc., can solve problems such as color gamut space deformation, brightness attenuation, etc., achieve the effects of correcting brightness attenuation, ensuring fidelity effect, and saving manpower

Inactive Publication Date: 2009-01-07
DALIAN DAMING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem of brightness attenuation and deformation of color gamut space existing in the prior art, and provides a full-color LED disp...

Method used

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  • On-line brightness correcting and color gamut optimizing method for full-color LED display screen
  • On-line brightness correcting and color gamut optimizing method for full-color LED display screen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] a. Use a CCD camera with two-dimensional test photometer and colorimeter function to shoot full-color LED display white balance screen and RGB three primary color screen to obtain plane light image;

[0028] b. The computer reads the plane light image information through the USB interface;

[0029] c. The computer determines and stores the number of pixels and the position coordinates of each pixel, and the selected pixels can be each pixel or set according to needs;

[0030] d. Measure and store the white light luminance value, three primary color luminance values ​​and color coordinate values ​​of the selected pixels;

[0031] e. Calculate and store the average value of pixel white light brightness, the average brightness of three primary colors and the average value of color coordinates;

[0032] f. Compare the brightness value of the pixel white light with the standard white light brightness value, and judge whether the difference exceeds the standard, that is, whe...

Embodiment 2

[0041] Except g step, other steps are with embodiment 1.

[0042] Step g is to compare the brightness of the original color with the standard brightness value of the original color in the order of green, red, and blue in units of pixels. 30~35%, blue light compensation 65~70%; red light brightness difference is compensated by green light compensation 38~42%, blue light compensation 58~62%; blue light brightness difference is compensated by red light compensation 82~85%, blue light compensation Shade supplement 15-18%.

[0043] For example, the color coordinates obtained from the captured plane light are X1, Y1, and the white light brightness value Y11 of the pixel is 1.096cd / m 2 , the brightness values ​​of the three primary colors are R11=324mcd / m 2 ;G11=668mcd / m 2 ; B11 = 104mcd / m 2 , while the white light brightness standard value (brightness design value at the time of delivery) Y=1.18cd / m 2 , Standard value of brightness of three primary colors R=354mcd / m 2 , G=708m...

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Abstract

The invention discloses a method for regulating online brightness and optimizing color range of a full-color LED display screen, which has the specific steps that: the white balance images and the RGB tricolor images of the full-color LED display screen are shot to obtain plane light images; the information of the plane light images is read; the number of pixels and each pixel position coordinate are determined and stored; the white light of the selected pixel, a tricolor brightness value and a color coordinate value are measured and stored; the pixel brightness and color coordinate mean value are computed and stored; the white light brightness value of the pixel is compared with a standard brightness value to judge whether difference value is out of limits. If the difference value is not out of limits, the regulation stops; if the difference value is out of limits, the following steps are carried out: the tricolor brightness light distribution value of the selected pixel is computed and stored; the color coordinate value of G(x, y), R(x, y), B(x, y) is computed after the light distribution and is judged whether within the standard color range or not; if not, the steps of g and h are repeated; if so, brightness regulation parameter is output to regulate the LED brightness of the selected pixel in the standard color range.

Description

Technical field: [0001] The invention relates to a method for calibrating the brightness of a full-color LED display, in particular to an online brightness calibrating method for a full-color LED display that can correct brightness attenuation and ensure optimization of the color gamut space during delivery and use of the full-color LED display And the method of color gamut optimization. Background technique: [0002] The full-color LED display is a flat light composed of RGB three-color LED chips. Generally, the brightness of the RGB three-color LED chips is calibrated according to the standard value before leaving the factory. Due to different manufacturing processes, LED chips have discreteness in terms of wavelength and brightness. Especially in the process of use, due to the different brightness attenuation coefficients of RGB three-color LED chips, the color gamut space is deformed, resulting in mottled and dirty LED displays. screen phenomenon, it is difficult to mai...

Claims

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Application Information

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IPC IPC(8): G09G3/32
Inventor 吴颖高
Owner DALIAN DAMING TECH
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