Electric lamp and discharge devices: systems – Plural load device systems – Electric switch in the supply circuit
Reexamination Certificate
2007-08-13
2010-06-01
Owens, Douglas W (Department: 2821)
Electric lamp and discharge devices: systems
Plural load device systems
Electric switch in the supply circuit
C315S318000, C315S291000, C349S046000
Reexamination Certificate
active
07728533
ABSTRACT:
An exemplary backlight control circuit (20) includes: at least two load circuits (210), a pulse width modulation integrated circuit (PWM IC) (250) having a current sampling pin (251), a switching circuit (270), and an input circuit (230). Each load circuit includes a backlight and a backlight inspecting circuit having an output end. The switching circuit includes a first transistor which includes a source electrode connected to ground, a drain electrode connected to the current sampling pin, a gate electrode connected to a power supply. The input circuit includes at least two first diodes, at least two input resistor, a second transistor, and a pink-to-pink detector circuit. The pink-to-pink detector circuit includes a second diode, a second bias resistor, and a second filter capacitor. Each output end of the load circuits is connected to the gate electrode of the second transistor via the input resistor, the first and second diode.
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Lu Jian-Hui
Zhou Tong
Chung Wei Te
Innocom Technology (Shenzhen) Co., Ltd.
Innolux Display Corp.
Kim Jae K
Owens Douglas W
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