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System for maintaining white uniformity in a displayed video image by predicting and compensating for display register changes

An image and video signal technology, applied in image communication, image reproducer using cathode camera tube, TV, etc., can solve the problems of color characteristic change, bad color change of light, etc.

Inactive Publication Date: 2006-02-15
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. Space charge repulsion of the three beams, resulting in the beams being gathered in a single gun trio
Thus, the described factors and effects produce undesirable changes in the color of the light, or changes in the color characteristics of the displayed image

Method used

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  • System for maintaining white uniformity in a displayed video image by predicting and compensating for display register changes
  • System for maintaining white uniformity in a displayed video image by predicting and compensating for display register changes
  • System for maintaining white uniformity in a displayed video image by predicting and compensating for display register changes

Examples

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Embodiment Construction

[0012] The system described herein is used to predict changes in the color characteristics of a displayed image, such as the amount of discoloration of white. The prediction includes calculating the power density, area and location of the bubble pattern on the screen of the display device. The CRT's red, green, and blue drive signals are then adjusted in specific areas of the screen that function to restore the color to the reference white. The modification of the drive in and / or between the three colors will take place in specific areas of the screen and will also become a slow function of time corresponding to the movement of the shadow mask due to heat generation. The system also includes means for determining and incorporating smoothing factors such that sharp boundaries and changes in the CRT drive signal and corresponding color temperature are impermissible to the user.

[0013] As described below, the effects of beam current, duration, location, and area extent can be ...

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Abstract

A system for correcting a color characteristic of an image displayed in response to a video signal involves processing the video signal for predicting a variation in a physical characteristic of a display device displaying the image, processing the video signal for determining a change in the color characteristic occurring in response to the variation in the physical characteristic, and modifying the video signal for compensating for the change in the color characteristic.

Description

technical field [0001] This invention relates to video signal processing systems and, more particularly, to video signal processing systems for correcting unwanted variations in displayed video images Background technique [0002] The systems described herein relate to video image display systems such as those comprising a color picture tube, or cathode ray tube (CRT), or picture tube display device. Those devices (often referred to herein as "CRTs" or "color picture tubes") generally include electron beam generating means for generating one or more electron beams (e.g., for generating R, G, and B electrons in a color CRT beams) that pass through a mask structure and strike a display screen to produce an image. [0003] Some CRTs (such as line screen CRTs) may have problems with white uniformity in high drive white mode, usually in the area between the center and the edges of the screen. White uniformity can be caused by at least two factors: [0004] 1. Bubbles or locali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/18H04N9/28G06F15/16G09G1/28H04N9/64H04N9/73
CPCG09G2320/043G09G1/28H04N17/02G09G2320/041G09G2320/0666G09G1/285H04N9/73H04N9/64
Inventor 伊斯特万·戈罗格罗伯特·L·巴宾
Owner THOMSON LICENSING SA
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