| US 7,586,469 B2 | ||
| Organic EL drive circuit and organic EL display device using the same organic EL drive circuit | ||
| Masanori Fujisawa, Kyoto (Japan); Shinichi Abe, Kyoto (Japan); and Hiroshi Yaguma, Kyoto (Japan) | ||
| Assigned to Rohm Co., Ltd., Kyoto (Japan) | ||
| Filed on May 12, 2005, as Appl. No. 11/127,249. | ||
| Claims priority of application No. 2004-141891 (JP), filed on May 12, 2004. | ||
| Prior Publication US 2005/0259050 A1, Nov. 24, 2005 | ||
| Int. Cl. G09G 3/30 (2006.01) | ||
| U.S. Cl. 345—76 [345/77] | 20 Claims |
| 1. An integrated organic EL drive circuit for driving an organic EL panel with drive currents generated correspondingly to
terminal pins of said organic EL panel on a basis of a reference current generated by a reference current generator circuit,
comprising:
a first input terminal supplied with a current externally of said integrated organic EL drive circuit, the current being in
phase with the reference current and having a value corresponding to a value of the reference current;
an output terminal;
a reference current selector circuit for selecting either the current or the reference current;
a current inverter circuit for inverting a phase of an output of said reference current selector circuit with respect to the
reference current; and
a current mirror circuit including an input side transistor, a plurality of first output side transistors and a second output
side transistor,
said current mirror circuit responsive to an output current of said current inverter circuit, for generating the drive currents
or currents, which is in phase with the reference current and from which the drive currents are obtained, at the plurality
of said first output side transistors, said second output side transistor for outputting a current, which is in phase with
the reference current and has values substantially equal to a value of the current selected by said reference current selector
circuit, to said output terminal.
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