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Method for preventing CRI fron heat injury caused by still picture

A still image and signal technology, applied in image communication, image reproducer using cathode camera tube, picture replicator, etc., can solve problems such as influence effect and burn marks, and achieve the effect of prolonging service life and protecting CRT.

Inactive Publication Date: 2004-10-27
SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But because there are often static and unchanging image contents on the TV screen, such as figure 1 The station logo (such as CCTV-1) and time signal shown, the fixed display content (such as disc information) output by the DVD player, etc., coupled with the high brightness characteristics of the CRT, these still images will soon be displayed on the CRT. Permanent burn marks are left on the fluorescent screen. Slight marks will affect the effect of watching other TV screens. In severe cases, it is even necessary to replace the CRT to continue to watch normally.

Method used

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  • Method for preventing CRI fron heat injury caused by still picture
  • Method for preventing CRI fron heat injury caused by still picture
  • Method for preventing CRI fron heat injury caused by still picture

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Embodiment Construction

[0017] Such as figure 1 Shown is the principle block diagram of the present invention, comprises the following steps:

[0018] 1) Utilize the translucent low-brightness region generating unit 1 to generate a signal for forming a translucent low-brightness region on the fluorescent screen;

[0019] 2) the signal described in step 1) and the signal for forming a normal TV picture produced by the video decoding circuit unit are superimposed by the superimposing unit;

[0020] Wherein, the generation of the signal used to form the translucent low-brightness area on the fluorescent screen described in step 1) can be generated at one time, and can also be generated in two or three steps, for example, the three-primary-color OSD signal is first generated, and then the brightness is reduced. Then convert the signal to a translucent state. The preferred embodiment of the present invention is to generate translucent low-brightness tri-color OSD signals in two steps, comprising the fol...

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Abstract

The method includes steps: (1) signal of translucent low brightness region is formed on screen by using unit 1 of generating translucent low brightness region; (2) superposition of signals are carried out between signal of the said in (1) and signal of normal TV frame generated by video frequency decoding circuit through superposition unit; (3) imaging circuit of CRT is controlled by superposed signal. The method reduces brightness of still picture, preventing CRT from heat injury, protecting CRT.

Description

technical field [0001] The invention relates to the imaging of a television CRT (cathode ray tube), and is especially applied in preventing specific areas of the CRT from being burned by fixed high-brightness images. Background technique [0002] At present, most TV sets use CRT (cathode ray tube) as the imaging unit, such as ordinary CRT TV, flat-screen CRT TV, rear projection CRT TV and so on. With the improvement of CRT production technology and quality, the brightness and contrast of TVs based on CRT imaging principles have been significantly improved, and the TV screens appear very bright. But because there are often static and unchanging image contents on the TV screen, such as figure 1 The TV station logo (such as CCTV-1) and time signal shown, the fixed display content output by the DVD player (such as disc information), etc., coupled with the high brightness characteristics of the CRT, these still images will soon be displayed on the CRT. Permanent burn marks are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/68H04N9/16
Inventor 夏季
Owner SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD