首页>
外国专利>
Automatic brightness contrast lighting circuits and luminance/color difference signal processor and video display apparatus comprising the same
Automatic brightness contrast lighting circuits and luminance/color difference signal processor and video display apparatus comprising the same
展开▼
机译:自动亮度对比照明电路和亮度/色差信号处理器以及包括该电路的视频显示设备
展开▼
页面导航
摘要
著录项
相似文献
摘要
The object of the present invention is to easily compensate automatic brightness limiting performance and automatic contrast limiting performance even if a picture is displayed with a different aspect ratio and to prevent deterioration of picture quality such as graduation and sharpness.;A picture display apparatus includes (1) an ABL (automatic brightness limiter) circuit including a comparison circuit for varying an EHT compensation starting point, an ABL gain control circuit for varying a slope of EHT regulation characteristic against APL, an ABL comparison voltage generator, a DAC for adjusting an ABL compensation starting point and a DAC for adjusting an ABL gain and (2) an ACL (automatic contrast limiter) circuit including another comparison circuit for varying an EHT compensation starting point, an ACL gain control circuit for varying a slope of EHT regulation characteristic against APL, an ACL comparison voltage generator, a DAC for adjusting an ACL compensation starting point and a DAC for adjusting an ACL gain.
展开▼