Aperture compensation circuit and RGB monitor

Details Aperture compensation circuit and RGB monitor Aperture compensation circuit and RGB monitor

1997-10-07

1999-07-20

Ton, My-Trang Nu

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

With compensation

358532, G06G 712

Patent

active

059260580

ABSTRACT:
A aperture compensation circuit which provides improvement in picture quality when a multi-media image is displayed and an RGB monitor employing the same includes a sharpness circuit provided between input terminals and a preamplifier. A lowest value detection circuit of the sharpness circuit detects a lowest value signal from among R, G and B signals supplied from the input terminals, and a differentiation circuit differentiates the lowest value signal to produce a differentiation signal. A slice circuit slices a component of the differentiation signal which corresponds to a portion at which a change from black to white occurs with an arbitrary amplitude to produce a second differentiation signal. The second differentiation signal from the slice circuit and the R, G and B signals supplied from the input terminals are added by addition circuits to effect contour correction of the R, B and G signals. A CRT is driven by the R, G and B signals for which contour correction has been performed.

REFERENCES:
patent: 5150206 (1992-09-01), Roberts
patent: 5493340 (1996-02-01), Kim
patent: 5541649 (1996-07-01), Yamamoto et al.
patent: 5751451 (1998-05-01), Ogoshi et al.
patent: 5828777 (1998-10-01), Suzuki

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