Automatic ambient light compensation for display backlighting

Details Automatic ambient light compensation for display backlighting Automatic ambient light compensation for display backlighting

2006-06-20

2006-06-20

Vu, David (Department: 2828)

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

C315S159000, C315S307000

Reexamination Certificate

active

07064492

ABSTRACT:
Control circuitry is used to control the backlighting of electronic displays. A light sensor (such as a phototransistor) is used to continuously measure ambient light conditions that are associated with an electronic display. A linear, continuous light-level signal is produced in response to the continuous measuring by the light sensor. The light-level signal is applied to a first input pin of an operational amplifier. The operational amplifier produces an output signal that is linear with respect to the light-level signal. The output signal is coupled to a second input pin, which provides feedback for the amplifier. The output signal is further coupled to an LED driver for driving backlighting LEDs.

REFERENCES:
patent: 5118992 (1992-06-01), Szuba
patent: 5754013 (1998-05-01), Praiswater
patent: 2004/0037094 (2004-02-01), Muegge et al.

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