| US 7,532,207 B2 | ||
| Drive circuit, display apparatus using drive circuit, and evaluation method of drive circuit | ||
| Somei Kawasaki, Saitama (Japan); Fujio Kawano, Kanagawa (Japan); and Masami Iseki, Kanagawa (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Mar. 03, 2004, as Appl. No. 10/790,738. | ||
| Claims priority of application No. 2003-061288 (JP), filed on Mar. 07, 2003; and application No. 2003-405642 (JP), filed on Dec. 04, 2003. | ||
| Prior Publication US 2004/0183752 A1, Sep. 23, 2004 | ||
| Int. Cl. G09G 3/1029 (2006.01) | ||
| U.S. Cl. 345—204 [345/77; 345/78; 345/80; 345/211; 345/690; 315/169.3] | 8 Claims |
| 1. A drive circuit, comprising:
a plurality of current signal generation circuits for outputting a current signal to each of a plurality of display units;
a current signal output line to which outputs of said plurality of current signal generation circuits are commonly connected;
a control circuit for controlling each of said plurality of current signal generation circuits to be a current signal output
state capable of evaluating an output of one of said plurality of current signal generation circuits;
a correction value output circuit for evaluating the output of the one of said plurality of current signal generation circuits
on a basis of the current values output through said current signal output line to output a correction value according to
an evaluation result; and
a correction circuit for correcting an image signal supplied to said plurality of current signal generation circuits by means
of the correction value, wherein
said control circuit supplies a predetermined signal to the one of said plurality of current signal generation circuits, and
supplies a signal different from the predetermined signal to the other current signal generation circuits.
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