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Method for adjusting screen brightness and chromaticity uniformity

A technology of uniform chromaticity and adjustment method, which is applied in the direction of luminance and chrominance signal processing circuits, color TVs, and components of color TVs, etc. The effect of uniformity

Active Publication Date: 2011-12-21
HUAWEI TEHCHNOLOGIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the screen display quality mainly has dark edges and corners and local color cast problems, especially when displaying pictures or pictures with white backgrounds, dark edges and corners and local color casts are particularly prominent, seriously affecting the display effect of the splicing wall

Method used

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  • Method for adjusting screen brightness and chromaticity uniformity
  • Method for adjusting screen brightness and chromaticity uniformity
  • Method for adjusting screen brightness and chromaticity uniformity

Examples

Experimental program
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Embodiment Construction

[0036] When the screen displays a white picture, you will see obvious dark edges and corners and color cast.

[0037] Such as figure 1 As shown, the incident light parallel to the optical axis of the lens is focused on the center part of the picture to form an image, assuming that its brightness is I 0 , the brightness of light incident on the image plane at an arbitrary angle θ that is not parallel to the optical axis is I e , then I 0 with I e The relationship between them is as follows:

[0038] I e = I 0 cos 4 θ (1)

[0039] This formula is called the fourth power law of cosines. From this law, it can be seen that the farther away from the center point on the screen, the smaller the energy of the light, which is the main reason for the vignetting phenomenon of the dark edge of the screen.

[0040] White light is formed by mixing red, green, and blue lights in a certain proportion, and the projection centers of the red, green, and blue lights should coincide. Howev...

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Abstract

The invention discloses a uniformity regulating method for brightness and chrominance. Calculated brightness compensating coefficients and chrominance compensating coefficients of all pixel points are burned on an optical machine, so as to achieve the regulation of the brightness and the chrominance of the screen. When the brightness compensating coefficients are calculated, the cosine quadruplicate law causing dark side and dark corner phenomena of the screen is considered adequately, and the brightness uniformity of a single screen in a large-screen sliced wall is improved greatly. When the chrominance compensating coefficients are calculated; the regulation of the chrominance is considered from an angle what one sees is what one gets, and the color shift condition of the screen is corrected through decreasing a pixel value of a drifted color in a color-drifting area.

Description

technical field [0001] The invention relates to the technical field of screen display, in particular to a method for adjusting screen brightness and chromaticity uniformity. Background technique [0002] The large-screen splicing wall is a large-screen display system composed of multiple small screens and projectors (image controllers). It is generally used for super-large screen display of one screen and multi-window display of multiple screens. The display quality of a single screen directly affects the display effect of the entire wall. At present, the screen display quality mainly has dark edges and corners and local color cast problems, especially when displaying pictures or pictures with a white background, dark edges and corners and local color casts are particularly prominent, seriously affecting the display effect of the splicing wall . Contents of the invention [0003] The invention provides a method for adjusting the uniformity of screen brightness and chroma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/74H04N9/77
Inventor 彭春山武海丽
Owner HUAWEI TEHCHNOLOGIES CO LTD
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