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Automatic adjustment apparatus for independently adjusting different regions of a picture raster

  • US 5,087,976 A
  • Filed: 10/31/1990
  • Issued: 02/11/1992
  • Est. Priority Date: 11/10/1989
  • Status: Expired due to Term
First Claim
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1. An automatic picture adjustment apparatus comprising, a level converter for performing level conversion on input video signals for adjusting the picture quality of a displayed image;

  • a level detector receiving and detecting the level of said input video signals, a controller which controls said level converter and receiving the output signal of said level detector, wherein said controller controls said level detector within a predetermined time period shorter than one vertical synchronization period, further comprising a sampling signal generator which generates sampling signals for determining individual sampled video signals which respectively correspond to different regions of a picture raster, and an A/D converter controlled by said sampling signal generator and converting the input video signals into corresponding digital signals, wherein said controller is formed of a micro-computer circuit, wherein said micro-computer circuit establishes individual parameters for each of said different regions of said picture raster, and wherein said level converter is controlled such that said different regions of a picture raster are individually adjusted.

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