Display device

Details Display device Display device

2011-04-19

2011-04-19

Hjerpe, Richard (Department: 2629)

Computer graphics processing and selective visual display system

Display driving control circuitry

Light detection means

C345S102000

Reexamination Certificate

active

07928972

ABSTRACT:
The present invention provides a display device having an illuminance detection circuit. The illuminance detection circuit includes: a photosensor which changes an optical current in response to illuminance of an external light; a capacitor which discharges a charge when the optical current flows in the photosensor; a comparator which compares a voltage at one end of the capacitor and a comparison reference voltage; a switching circuit which is connected to one end of the capacitor and charges the capacitor in response to a level of an output signal of the comparator; and a selection circuit which applies either a first voltage or a second voltage to the other end of the capacitor in response to the level of the output signal of the comparator.

REFERENCES:
patent: 6552712 (2003-04-01), Koizumi
patent: 7129938 (2006-10-01), Naugler, Jr.
patent: 7502001 (2009-03-01), Fish et al.
patent: 7595795 (2009-09-01), Shin et al.
patent: 2003/0174118 (2003-09-01), Sato et al.
patent: 05-164609 (1993-06-01), None
patent: 2002-072992 (2002-03-01), None
patent: 2003-021821 (2003-01-01), None

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