Constant-current driving circuit

Details Constant-current driving circuit Constant-current driving circuit

2011-06-14

2011-06-14

Mengistu, Amare (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

Reexamination Certificate

active

07961158

ABSTRACT:
A constant-current driving circuit includes a first current source, a reference voltage generating circuit and an output signal generating circuit. A terminal of the first current source is coupled to a terminal of a first LED string, wherein the terminal of the first current source has a first voltage. The reference voltage generating circuit is used for generating a reference voltage and comparing the first voltage with a first predetermined voltage to generate a first comparing signal to thereby adjust the reference voltage. The output signal generating circuit is used for outputting an output signal to another terminal of the first LED string and receiving the input signal, wherein the output signal generating circuit decides whether or not to output the input signal serving as the output signal according to the comparison result of the reference voltage with the second voltage.

REFERENCES:
patent: 5815025 (1998-09-01), Kubota
patent: 6161910 (2000-12-01), Reisenauer et al.
patent: 7235954 (2007-06-01), Murakami
patent: 2001-215913 (2001-08-01), None
patent: 2005-116859 (2005-04-01), None
patent: 2007-095907 (2007-04-01), None
“Office Action of Japan Counterpart Application”, issued on Sep. 7, 2010, p. 1-p. 2, in which the listed references were cited.

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