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发明授权
US5287172A Automatic on-screen color converting circuit for a color television 失效
用于彩色电视的自动屏幕彩色转换电路

Automatic on-screen color converting circuit for a color television
摘要：
An automatic on-screen color signal converting circuit is disclosed, which includes a color signal level detecting part (30), an inverting part (40), and combining/switching part (70), wherein the color signal level detecting part (30) detects the level of the video color signal from the input color difference signal and luminance signal and the inverting part (40) inverts the output signal of the color signal level detecting part (30) to combine them with an on-screen signal blanking signal outputted from an OSD generating part (60). Therefore, the cathode ray tube driving circuit (20) is provided with an OSD color signal which is complementary to that of the video signal and the on-screen signal can be always clearly distinguished from the video signal during their simultaneous display and also automatically converted according to changing of the video signals.
摘要（中）：

公开了一种自动屏幕彩色信号转换电路，它包括一个彩色信号电平检测部分（30），一个反相部分（40）和组合/切换部分（70），其中彩色信号电平检测部分（30） 从输入色差信号和亮度信号中检测出视频彩色信号的电平，反相部分（40）使颜色信号电平检测部分（30）的输出信号反相，将它们与输出的屏上信号消隐信号相组合 来自OSD生成部（60）。 因此，阴极射线管驱动电路（20）具有与视频信号互补的OSD颜色信号，并且在屏幕信号同时显示期间可以始终将视频信号与视频信号清楚地区分开，并且还自动转换 根据视频信号的变化。

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