Battery state monitoring device and electronic device fitted...

Details Battery state monitoring device and electronic device fitted... Battery state monitoring device and electronic device fitted...

2005-03-08

2005-03-08

Tso, Edward H. (Department: 2838)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

C345S102000

Reexamination Certificate

active

06864665

ABSTRACT:
In an electronic device that uses a self-emissive display such as an organic EL display, terminal voltage of a battery is monitored with high precision.In a digital camera10, an organic EL display26is driven by a battery12. The terminal voltage of the battery12is detected and a CPU20compares the detected terminal voltage with a threshold voltage to determine whether or not a fully discharged state has been reached. The luminance level of an image for the next frame stored in a VRAM24is detected, and the threshold value is dynamically changed according to the luminance level.

REFERENCES:
patent: 5386577 (1995-01-01), Zenda
patent: 5493685 (1996-02-01), Zenda
patent: 5854617 (1998-12-01), Lee et al.

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