Temperature dependant LED current controller

Details Temperature dependant LED current controller Temperature dependant LED current controller

2007-05-22

2010-02-16

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S157000

Reexamination Certificate

active

07663326

ABSTRACT:
The present invention provides a controller for regulating current in LEDs in electronic displays. The controller uses temperature sensing diodes to detect changes in the LED ambient temperature. As the LED ambient temperature changes, the forward voltage of the temperature sensing diode decreases. A signal processor adjusts the current passing through the LEDs based on the temperature induced changes in the forward voltage of the temperature sensing diodes. The present invention can reduce costs over the present methods of regulating current in LEDs and may more easily be integrated into a single integrated circuit chip. The temperature sensing may also be implemented outside the integrated circuit chip.

REFERENCES:
patent: 5642252 (1997-06-01), Sakamoto et al.
patent: 5661645 (1997-08-01), Hochstein
patent: 6161910 (2000-12-01), Reisenauer et al.
patent: 6362578 (2002-03-01), Swanson et al.
patent: 7262752 (2007-08-01), Weindorf
patent: 2002/0130786 (2002-09-01), Weindorf
International Search Report for PCT/US08/64265, mailed Aug. 8, 2008.

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