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11. 发明授权

US5699127A Automatic brightness limiter automatic control circuit, contrast limiter control circuit, luminance/color difference signal processor and video display apparatus 失效
标题翻译：自动亮度限制器控制电路，自动对比度限制器控制电路，亮度/色差信号处理器和视频显示设备
公开(公告)号：US5699127A
公开(公告)日：1997-12-16
申请号：US519076
申请日：1995-08-24
申请人： Hiroshi Ando , Hiroki Kinugawa , Masahiko Sasada , Minoru Miyata
发明人： Hiroshi Ando , Hiroki Kinugawa , Masahiko Sasada , Minoru Miyata
IPC分类号： H04N5/57 , H04N5/59
CPC分类号： H04N5/68 , H04N5/57 , H04N7/0122
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 gradation and sharpness. A picture display apparatus includes (1) an automatic brightness limiter (ABL) circuit including a comparison circuit for varying an EHT compensation starting point, an ABL gain control circuit for varying a slope of the EHT characteristic versus the 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 automatic contrast limiter (ACL) circuit including another comparison circuit for varying an EHT compensation starting point, an ACL gain control circuit for varying a slope of the EHT characteristic versus the APL, an ACL comparison voltage generator, a DAC for adjusting an ACL compensation starting point and a DAC for adjusting an ACL gain.
摘要翻译：本发明的目的是即使以不同的纵横比显示图像并且防止诸如灰度和锐度的图像质量的劣化，也容易地补偿自动亮度限制性能和自动对比度限制性能。图像显示装置包括（1）包括用于改变EHT补偿起始点的比较电路的自动亮度限制器（ABL）电路，用于改变EHT特性对APL的斜率的ABL增益控制电路，ABL比较电压发生器，用于调整ABL补偿起始点的DAC和用于调整ABL增益的DAC，和（2）包括用于改变EHT补偿起始点的另一个比较电路的自动对比度限制器（ACL）电路，用于改变ABL增益的ACL增益控制电路 EHT特性与APL的斜率，ACL比较电压发生器，用于调整ACL补偿起始点的DAC和用于调整ACL增益的DAC。

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