Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1996-11-26
1999-10-12
Chow, Dennis-Doon
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 46, 345211, 345212, 34081546, G09G 332
Patent
active
059661100
ABSTRACT:
An LED driver drives a plurality of light emitting diodes (LEDs) having first terminals connected to a common output stage and second terminals respectively receiving different, suitably rectified, phases of a sinusoidal signal. An output stage of the LED driver includes a first bipolar transistor coupled between a first supply terminal and the first terminals of the LED's. A first MOS transistor drives the base of the first bipolar transistor. The gate of the first MOS transistor is coupled to a first reference voltage. A second bipolar cascode transistor is connected in series with the first MOS transistor and biased by a second reference voltage such that the voltage across the first MOS transistor does not exceed a limit value.
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Awad Amr
Carlson David V.
Chow Dennis-Doon
de Guzman Dennis M.
STMicroelectronics S.A.
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