Backlight control circuit having frequency setting circuit...

Details Backlight control circuit having frequency setting circuit... Backlight control circuit having frequency setting circuit...

2011-02-22

2011-02-22

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

With load device temperature modifier

C315S117000, C315S118000

Reexamination Certificate

active

07893624

ABSTRACT:
An exemplary backlight control circuit includes an inverter, a pulse width modulation (PWM) circuit, and a frequency setting circuit. The inverter is configured to provide an alternating current voltage to a lamp. The PWM circuit is configured to provide a pulse control signal to the inverter. The frequency setting circuit configured to regulate a frequency of the pulse control signal provided by the PWM circuit according to an environment temperature.

REFERENCES:
patent: 5907742 (1999-05-01), Johnson et al.
patent: 6654268 (2003-11-01), Choi
patent: 2004/0207532 (2004-10-01), Smithson
patent: 2006/0138972 (2006-06-01), Hsieh et al.
patent: P2000-350448 (2000-12-01), None
Ming-Dong Zhou. Min Jia, Digital Potentiometer and Its Applications, (1st Ed), published by Digitized Periodical in Feb. 28, 2006. See pp. 65-66, Figure 1 and Table 1.

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