Computer graphics processing and selective visual display system – Display driving control circuitry
Reexamination Certificate
2005-01-25
2008-03-11
Nguyen, Jimmy H. (Department: 2629)
Computer graphics processing and selective visual display system
Display driving control circuitry
C345S102000, C345S082000, C345S211000, C345S207000
Reexamination Certificate
active
07342577
ABSTRACT:
Apparatus are provided for driving an LED light source and controlling a light output of the light source over a wide luminance range in response to a luminance input. The apparatus includes: a voltage source having an output configured to couple with the light source, a first input configured to receive the luminance input, and a second input; a photodetector unit configured to logarithmically compress the luminance range and determine a voltage based on a luminance of the light source in the compressed range; a comparator having an input coupled to the photodetector unit and having an output; and, a signal converter having an input coupled to the output of the comparator and having an output coupled to the second input of the voltage source. The voltage source is configured to generate an output signal at the output of the voltage source. The output signal has a frequency and a pulse width based on the luminance input. The comparator is configured to determine an error signal based on a comparison of the luminance input with the voltage. The converter is configured to exponentially convert the error signal to the frequency.
REFERENCES:
patent: 4490655 (1984-12-01), Feldman
patent: 4581544 (1986-04-01), Feldman
patent: 4631540 (1986-12-01), Feldman
patent: 5391934 (1995-02-01), Feldman
patent: 5606318 (1997-02-01), Feldman
patent: 5754013 (1998-05-01), Praiswater
patent: 5783909 (1998-07-01), Hochstein
patent: 6329802 (2001-12-01), Feldman
patent: 6396217 (2002-05-01), Weindorf
patent: 6411042 (2002-06-01), Cull et al.
patent: 6411072 (2002-06-01), Feldman
patent: 6563479 (2003-05-01), Weindorf et al.
patent: 6666567 (2003-12-01), Feldman et al.
patent: 6724158 (2004-04-01), Feldman
patent: 6747413 (2004-06-01), Cull et al.
patent: 7183727 (2007-02-01), Ferguson et al.
patent: 7262560 (2007-08-01), Jaffar et al.
patent: 2002/0118182 (2002-08-01), Luther Weindorf
patent: 2003/0214242 (2003-11-01), Berg-Johansen
PCT International Search Report PCT/US2006/000019, Jun. 19, 2006.
Davey Dennis M.
Ronning Eric D.
Struebel Mark A.
Honeywell International , Inc.
Ingrassia Fisher & Lorenz
Nguyen Jimmy H.
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