发明名称 A television system having an ultrablack video signal blanking level for an on-screen character display.
摘要 <p>An arrangement for displaying characters and/or graphics on the screen of a television system including a brightness control section (23) for controlling the black level of video images includes a character blanking section (79) for blanking behind the video image so as to make the characters and/or graphics more visible. The character blanking section is coupled to the brightness control section for generating an "ultra-black" character blanking level which tracks, but is slightly greater (in the black direction) than the black level for the video image. &lt;IMAGE&gt;</p>
申请公布号 EP0512332(A2) 申请公布日期 1992.11.11
申请号 EP19920106981 申请日期 1992.04.24
申请人 THOMSON CONSUMER ELECTRONICS S.A. 发明人 KIM, YONG HYUN
分类号 H04N5/445;H04N5/57;H04N9/74 主分类号 H04N5/445
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