LED-switching controller and LED-switching control method

Details LED-switching controller and LED-switching control method LED-switching controller and LED-switching control method

2004-10-02

2008-10-14

Awad, Amr (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C315S169300

Reexamination Certificate

active

07436378

ABSTRACT:
An LED terminal monitoring circuit detects an LED at the lowest potential among a plurality of parallel-connected LEDs. An analog signal selecting circuit gives a signal indicating the voltage of the detected LED to a boosting circuit. The boosting circuit performs a boosting operation on the basis of the condition of the detected LED at the lowest voltage and, consequently, a voltage sufficient for driving the LEDs in a current-control mode can be applied to all the LEDs. Signal lines not connected to LEDs are excluded from objects of a LED-switching control operation.

REFERENCES:
patent: 6351079 (2002-02-01), Willis
patent: 6466188 (2002-10-01), Cato
patent: 6538394 (2003-03-01), Volk et al.
patent: 6980181 (2005-12-01), Sudo
patent: 2004/0233144 (2004-11-01), Rader et al

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