Light sensing circuit, backlight control apparatus having...

Details Light sensing circuit, backlight control apparatus having... Light sensing circuit, backlight control apparatus having...

2011-06-14

2011-06-14

Hjerpe, Richard (Department: 2629)

Computer graphics processing and selective visual display system

Display driving control circuitry

Light detection means

C345S102000, C257S225000, C250S200000

Reexamination Certificate

active

07961181

ABSTRACT:
A light sensing circuit capable of enhancing a reliability by lowering a dependency on a temperature change without using a resistor, a backlight control apparatus having the same, and an LCD device having the same. The light sensing circuit includes a first MOS-transistor; and a second MOS-transistor serially connected to the first MOS-transistor between a first power terminal and a ground terminal, in which a second power terminal is connected to each gate terminal of the first MOS-transistor and the second MOS-transistor, and an optical amount detecting terminal is connected to a common connection point between a drain terminal of the first MOS-transistor and a source terminal of the second MOS-transistor.

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Office Action issued in corresponding Korean Patent Application No. 10-2006-0057131; issued Oct. 30, 2009.

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