Tone correcting apparatus for laser display system

Details Tone correcting apparatus for laser display system Tone correcting apparatus for laser display system

1993-02-17

1994-08-16

Groody, James J.

Television

Video display

Projection device

348760, 348769, H04N 140, H04N 308, H04N 931, H04N 574

Patent

active

053391187

ABSTRACT:
A tone correcting apparatus for an image display apparatus is disclosed. The apparatus includes a test signal generating circuit for generating a test signal, a memory for outputting tone correction data depending upon the test signal, a modulating circuit for modulating the light from a light source depending upon the tone correction data, a detecting circuit for detecting the modulated light from the modulated circuit, and a control circuit for calculating correction data depending upon a detected signal output from the detecting circuit. The correction data is stored in memory. Also disclosed is a laser display apparatus in which a laser beam is modulated according to a video signal before being displayed. An synchronizing separating circuit separates a synchronizing signal from the video signal. A selecting circuit selects between a test signal generated by a test signal generating circuit and the video signal depending upon the synchronization signal. A memory outputs corresponding tone correction data depending upon the signal selected.

REFERENCES:
patent: 4586089 (1986-04-01), Nakazato et al.
patent: 5097324 (1992-03-01), Tanaka et al.
patent: 5231481 (1993-07-01), Eouzan et al.
"Image Display" pp. 183 to 184, written by Iwao Ohishi, Takatoshi Ohkoshi, Norihiko Nakayam and published by Corona Publishing Limited.

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