Automatic brightness limiter automatic control circuit, contrast

Details Automatic brightness limiter automatic control circuit, contrast Automatic brightness limiter automatic control circuit, contrast

1995-08-24

1997-12-16

Burgess, Glen B.

Television

Image signal processing circuitry specific to television

Gray scale transformation

348673, 348687, H04N 557

Patent

active

056991274

ABSTRACT:
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.

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