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Method for adjusting non-linear image of CRT rear-projection television receiver

A non-linear, television technology, applied in the field of CRT rear-projection televisions, can solve the problems of image clarity and the effect of moving images, and achieve the effect of saving costs

Inactive Publication Date: 2006-09-27
SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the above-mentioned nonlinear transformations are basically obtained by digitizing the image and performing digital arithmetic on the image by the image signal digital processing unit of the TV. However, this method requires the use of expensive digital processing chips, and due to the digital sampling of the image , so the sharpness of the transformed image and the effect of the moving image are affected

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  • Method for adjusting non-linear image of CRT rear-projection television receiver

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Embodiment Construction

[0016] see figure 1 A method for adjusting the nonlinear image of a CRT rear-projection television in the present invention is to utilize the original convergence scanning circuit of the CRT rear-projection to achieve the effect of image nonlinear transformation through regional nonlinear scanning. The CRT rear projection television has three CRT monochromatic projection tubes of red, green and blue, which respectively have deflection coils, and the deflection coils generate control magnetic fields to control the horizontal and vertical scanning characteristics of the CRT electron beams. The deflection coils are respectively controlled by red, green and blue convergent line / field scanning drive circuits. This each convergent line / field scanning circuit adopts existing driving chip, as the chip of pioneer company model is CM0021, and this chip can produce the controllable line (field) that has 9 (10) control points in each line (field) period. ) current, by controlling these 9...

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Abstract

Method of non-linear convergent scanning is realized in following steps: driving circuit for red, blue and green convergent line and field scanning in back projection TV set generates non-linear magnetic field; the said non-linear magnetic field makes CRT electron beam generate relevant horizontal / vertical scanning so that non-linear transformation is realized. Since original convergent scanning circuit is adopted in the invention so as to save cost. Meanwhile, digital sampling is not needed, thus, the invention provides better clear image.

Description

【Technical field】 [0001] The invention relates to the field of CRT rear-projection televisions, in particular to a method for adjusting nonlinear images of CRT rear-projection televisions. 【Background technique】 [0002] Existing cathode ray tube rear projection televisions have two screen ratios: 4:3 and 16:9. At the same time, there are two signal ratio formats we can see: 4:3 (for example: PAL, NTSC analog video signal) and 16:9 (for example: HDTV 1080I high-definition signal), so the following situations will appear : [0003] A: Watch a 4:3 video signal in full screen on a 16:9 screen; [0004] B: watch the 16:9 video signal on the full screen of the 4:3 screen; [0005] C: Watch a 4:3 video signal in full screen on a 4:3 screen: [0006] D: Watch the 16:9 video signal on the full screen of the 16:9 screen. [0007] For the above two cases of C and D, the image we see is the same as the actual video signal, that is, the video signal is not deformed but reproduced o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/74H04N3/16
Inventor 夏季
Owner SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD