Projection type video display

Details Projection type video display Projection type video display

2007-04-24

2007-04-24

Perkey, W. B. (Department: 2851)

Optics: image projectors

Light shield, mask, hood, or diaphragm

C353S085000, C353S088000, C362S321000, C362S324000, C359S578000, C349S007000, C348S744000

Reexamination Certificate

active

10878356

ABSTRACT:
A video signal processing circuit inputs a video signal to perform processing such as frequency conversion as well as processing for generating data representing the APL (Average Picture Level) of a frame video for each frame period. A microcomputer functions as a dimmer arithmetic block to perform processing for generating dimmer data upon receipt of APL data, and functions as a lamp driver control block to perform processing for sending out a dimmer command to a lamp driver. The lamp driver receives the dimmer command, to control an amount of light emitted from a light source (a lamp).

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