Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2006-05-05
2010-06-29
Shalwala, Bipin (Department: 2629)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S211000, C345S212000, C345S204000, C315S291000, C315S307000, C323S344000
Reexamination Certificate
active
07746300
ABSTRACT:
A circuit for controlling pulsed current to a load, one application of which is in LED dimmer circuitry, comprises first and second reference nodes for receiving a supply voltage, an input node for receiving a timing signal such as a PWM signal, and a controlled switch coupled between the first and second reference voltage nodes for supplying current to the load. Pull-up circuitry may be coupled between a control electrode of the controlled switch and first reference voltage node, and a pull-down switch coupled between the control electrode and second reference voltage node. A control circuit coupled between the input node and control electrode of the controlled switch is configured to control the controlled switch in response to the timing signal. The circuit may further include a reference voltage source configured for producing a voltage of magnitude independent of supply voltage magnitude. The control circuit is coupled to the reference voltage source and operative to control the controlled switch in response to the timing signal and reference voltage.
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Legates Bryan A.
Young Eric S.
Zhang Bin
Linear Technology Corporation
McDermott Will & Emery LLP
Shalwala Bipin
Spar Ilana
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