LED driver circuit for a backlight device

Details LED driver circuit for a backlight device LED driver circuit for a backlight device

2008-05-02

2010-10-26

Tran, Thuy Vinh (Department: 2821)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C315S169200, C315S169300, C315S291000, C315S308000

Reexamination Certificate

active

07821491

ABSTRACT:
A backlight device that is not affected by offset voltage. Driving transistor (41) operates such that current flows in LED circuit (11), and the detection voltage generated by current detector (42) and the reference voltage are input alternately to first input transistor (30a) and second input transistor (30b) of amplifier (20). Brightness adjusting switch (43) operates such that when driving transistor (41) is turned OFF during the OFF period of LED circuit (11), for example, during the horizontal blanking interval or vertical blanking interval, the detection voltage and the reference voltage are swapped, so that the average voltage generated in current detector (42) is equal to the reference voltage, and the effect of the offset voltage can be eliminated.

REFERENCES:
patent: 7307614 (2007-12-01), Vinn
patent: 7495397 (2009-02-01), Okabe
patent: 2004/0124889 (2004-07-01), Koharagi et al.

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