Television – Image signal processing circuitry specific to television – Brightness control
Patent
1993-06-02
1995-01-31
Kostak, Victor R.
Television
Image signal processing circuitry specific to television
Brightness control
348563, 348569, H04N 557, H04N 544
Patent
active
053862473
ABSTRACT:
An on-screen display generator for use in an image display system is disclosed. The on-screen display generator includes a main image signal source, and an auxiliary image signal source which includes a controller for varying the perceived brightness of the image represented by the auxiliary image signal in response to a first control signal. A video signal processor, coupled to the main image signal source and the auxiliary image signal source, includes circuitry for combining the main and auxiliary image signals to produce a combined image signal. The video signal processor further includes a controller for varying the perceived brightness of the image represented by the combined image signal in response to a second control signal. A control signal generator generates the first and the second control signals in such a manner that the perceived brightness of the auxiliary image signal remains substantially constant when the perceived brightness of the main image is varied. This on-screen display generator is disclosed as being embodied in a sleep timer in a television receiver.
REFERENCES:
patent: 5153580 (1992-10-01), Pollack
patent: 5194951 (1993-03-01), Hailey et al.
Dinwiddie Aaron H.
Duffield David J.
Shafer Kirk E.
Emanuel Peter M.
Flynn Nathan J.
Kostak Victor R.
Lenihan Thomas F.
Thomson Consumer Electronics Inc.
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