On-screen display circuit

Details On-screen display circuit On-screen display circuit

2006-02-10

2009-12-08

Natnael, Paulos M (Department: 2622)

Television

Basic receiver with additional function

For display of additional information

Reexamination Certificate

active

07630017

ABSTRACT:
The invention relates to a color half tone display for giving a specific hue to a designated region while displaying the original image by a transparent display at the designated region in an on-screen display in a television receiver. A circuit for generating signals of respective colors of RGB by synthesizing a brightness component Y of the original image and chrominance components (R-Y), (G-Y), (B-Y) using an adder12is provided with a switch element10for restricting an input of the chrominance component to the adder12. When an I signal designates a half tone display region, the switch element10is brought into OFF state based on the I signal. The color half tone display is carried out by attenuating an output signal of the adder12by an amplifier14for respective signals of RGB, thereafter, shifting a direct current level of a component in accordance with a hue to be added in RGB by a DC shift circuit16.

REFERENCES:
patent: 6118494 (2000-09-01), Knox et al.
patent: 6369858 (2002-04-01), Lee
patent: 6529244 (2003-03-01), Hrusecky
patent: 6570626 (2003-05-01), Mendenhall et al.
patent: 6587155 (2003-07-01), Xue
patent: 7362381 (2008-04-01), Stahl et al.

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