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Method and apparatus for image geometrical distortion compensation of TV set

A technology of geometric distortion and compensation device, which is applied in TV, image communication, scanning details of TV system, etc. It can solve the problems of high cost, complex processing circuit and low reliability, and achieve the effect of keeping the size unchanged.

Inactive Publication Date: 2009-06-03
SHENZHEN TCL NEW-TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The above three methods all use analog technology to keep the size of the grating unchanged. The processing circuit is complex, the cost is high, and the reliability is relatively low. Currently, there are not many TVs.

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  • Method and apparatus for image geometrical distortion compensation of TV set
  • Method and apparatus for image geometrical distortion compensation of TV set
  • Method and apparatus for image geometrical distortion compensation of TV set

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Embodiment Construction

[0028] figure 1 As shown, the specific embodiment of the present invention includes: ① EHT beam current detector, ② A / D converter, ③ digital processor, ④ progressive processing / image scaling circuit, ⑤ D / A converter. The process of realizing image geometric distortion compensation is:

[0029] When the brightness of the image displayed on the TV changes, the EHT beam current detector ① will output the anode high voltage winding of the flyback transformer to detect the change in beam current reflecting the brightness change of the image, and send it through the A / D converter ② To the digital processor ③, the digital processor calculates the beam current variation, outputs the correction data, and sends it to the progressive processing / image scaling circuit ④. In the video signal processing channel, the analog video signal output by the image decoding and processing integrated circuit is converted into a digital video signal by the A / D converter, and the output of the digital p...

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Abstract

This invention relates to a geometrical distortion compensation method and a device for CRT TV images, in which, the change of brightness of the displayed image content of a TV will result in related changes to the EHT voltage and the electronic beam current of the kinescope, then a digital processor generates digital correct data to control the digital video signal processor to re-organize the fetch and output relation of the video signals to alter the output display time of the pixels on the screen to compensate the image geometrical distortion, thus, the image diameter is not changed and the image is not distorted even if the scan grid width is changed when the brightness is changed.

Description

technical field [0001] The present invention relates to a method and device for correcting and compensating TV images, more precisely, it is a method and device for compensating and correcting effects on geometric dimensions of images when the brightness of CRT TV images changes. Background technique [0002] The width of the picture on the TV changes as the brightness of the picture changes. The brightness of the image becomes higher, and its width becomes larger at the same time. The process of this phenomenon is: image brightness increases → picture tube beam current increases → EHT voltage decreases → electron beam deflection sensitivity increases → scanning grating and image size become larger. Otherwise, the image size becomes smaller. Several solutions currently exist are: [0003] 1. Stabilize the EHT voltage: add a voltage stabilizer to the EHT voltage, so that when the beam current changes, the EHT voltage remains unchanged, so that the image width is stable. ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N3/23H04N3/22
Inventor 黄凯华
Owner SHENZHEN TCL NEW-TECH CO LTD