Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2007-02-09
2010-11-02
Hjerpe, Richard (Department: 2629)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S077000, C345S087000, C345S102000
Reexamination Certificate
active
07825882
ABSTRACT:
A dimming method for LED driving circuit is proposed. By temporary switching a pin that is originally used for the input/output of other electric signals to a high impedance node, the dimming control signal may be inputted to dim LEDs. The dimming method comprises the steps of: floating the pin every a period of time to pull the pin's voltage being equal to the dimming control signal; detecting the pin's voltage; and retrieving the dimming control signal in accordance with the detected pin's voltage and thereafter dimming the LEDs.
REFERENCES:
patent: 7368977 (2008-05-01), Wei et al.
Chen Chien-Sheng
Chen Chin-Tsung
Huang Tsung-Wei
Lin Shui-Mu
Wei Wei-Hsin
Hjerpe Richard
Richtek Technology Corp.
Said Mansour M
Stout, Uxa Buyan & Mullins, LLP
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