Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2006-01-31
2006-01-31
Nguyen, Jimmy H. (Department: 2673)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S214000, C345S076000, C315S169100, C315S169300
Reexamination Certificate
active
06992647
ABSTRACT:
An input side drive current of a D/A converter circuit is controlled by a switch circuit connected in series with at least one of a plurality of input side transistors connected in parallel to form a current mirror connection. By turning the switch circuit from ON to OFF, a constant current flowing through the input side transistor, which is turned OFF by the switch circuit, is distributed to the remaining input side transistors, resulting in a large D/A converted current in a current mirror connected output side transistor. Thus, it is possible to correspondingly reduce a value of a display data, so that the number of bit positions of the D/A converter circuit can be reduced by 1 or more.
REFERENCES:
patent: 6586888 (2003-07-01), Kitahara et al.
patent: 6747417 (2004-06-01), Meade et al.
patent: 6756738 (2004-06-01), Maede et al.
patent: 6777885 (2004-08-01), Koyama
patent: 2003-234655 (2003-08-01), None
U.S. Appl. No. 10/102,621, filed Mar. 22, 2002, Kitahara et al.
Fujisawa Masanori
Hanada Kouichi
Shimada Yuji
Holton Steven
Mattingly ,Stanger ,Malur & Brundidge, P.C.
Nguyen Jimmy H.
Rohm & Co., Ltd.
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