Backlight control circuit with input circuit including diode...

Details Backlight control circuit with input circuit including diode... Backlight control circuit with input circuit including diode...

2011-07-05

2011-07-05

Eisen, Alexander (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C315S291000

Reexamination Certificate

active

07973760

ABSTRACT:
An exemplary backlight control circuit (200) includes a DC power supply (VDD), a load circuit (210), an input circuit (230), and a PWM IC (250). The load circuit includes two light sources (2113, 2114) and a rectifier and filter circuit (213). The input circuit includes a diode (231) and a capacitor (237). The PWM IC includes a current sampling pin (251) and an overvoltage protection pin (253). A low voltage terminal of a first one of the two light sources is connected to the current sampling pin via the rectifier and filter circuit, and a low voltage terminal of a second one of the two light sources is connected to a cathode of the diode. An anode of the diode is connected to the DC power supply and grounded via the capacitor. The overvoltage protection pin is connected to the DC power supply.

REFERENCES:
patent: 6657838 (2003-12-01), Min
patent: 7030569 (2006-04-01), Gray
patent: 200407631 (2004-05-01), None
patent: 200515840 (2005-05-01), None

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