Method for preventing CRI fron heat injury caused by still picture

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

CN1281068CInactive Publication Date: 2006-10-18SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2006-10-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for preventing still images from burning a CRT, comprising the following steps: using an OSD circuit module to generate red, green and blue primary color OSD signals for forming a low-brightness area on a fluorescent screen; setting the OSD switch control signal The high level of the above-mentioned low-brightness three-primary-color OSD signal is formed into a translucent low-brightness three-primary-color OSD signal; the scanning start time of the signal generated by the control OSD circuit module; the translucent low-brightness three-primary-color OSD signal and The signal generated by the video decoding circuit unit to form a normal TV picture is superimposed by the superimposing unit; the superimposed signal is used to control the imaging circuit of the CRT. In this way, the brightness of the still image is reduced, and it is not easy to leave burn marks on the fluorescent screen of the CRT, which protects the CRT and prolongs the service life of the TV set.
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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 2 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 ...

Examples

Embodiment Construction

[0016] Such as figure 1 Shown is the principle block diagram of the present invention, comprises the following steps:

[0017] 1) Utilize the OSD circuit module to generate red, green and blue primary color OSD signals for forming low-brightness areas on the fluorescent screen;

[0018] 2) By setting the high level of the OSD switch control signal, the above-mentioned low-brightness three-primary-color OSD signal is formed into a translucent low-brightness three-primary-color OSD signal;

[0019] 3) Control the horizontal start time, horizontal end time, vertical start time, and vertical end time of the OSD signal scan generated by the OSD circuit module;

[0020] 4) The translucent low-brightness three-primary-color OSD signal and the signal used to form a normal TV picture generated by the video decoding circuit unit are superimposed through the superimposing unit;

[0021] 5) Use the superimposed signal to control the imaging circuit of the CRT.

[0022] Wherein, the ge...