Backlight current control in portable electronic devices

Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Discharge control discharge device load controlled by the...

Reexamination Certificate

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Details

C315S158000, C315S159000, C345S102000

Reexamination Certificate

active

07808185

ABSTRACT:
A method in a portable electronic device (100) having a user interface illumination (110) is disclosed. The method comprises sensing (202) an ambient light level in a neighborhood of the portable electronic device with a sensor (104) of the portable electronic device. Based on the ambient light level sensed, then controlling (204) a visual characteristic of the user interface illumination, wherein the user interface illumination is operated at a brightness between a maximum brightness and a minimum brightness for at least one ambient light level detected.

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patent: 5554912 (1996-09-01), Thayer et al.
patent: 6563479 (2003-05-01), Weindorf et al.
patent: 6798395 (2004-09-01), Yamauchi et al.
patent: 2005/0093466 (2005-05-01), Matsumoto
patent: 0 381 684 (1994-12-01), None

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