Reference current generating circuit, organic EL drive...

Details Reference current generating circuit, organic EL drive... Reference current generating circuit, organic EL drive...

2008-04-28

2009-11-10

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

C345S076000, C345S204000

Reexamination Certificate

active

07615932

ABSTRACT:
An organic EL display device having an organic EL drive circuit has a reference current generation circuit that switches the column line drive in response to changing of the dot arrangement of R, G and B through changeover switch circuits. Three D/A converter blocks constituted by a plurality of switch circuits and a plurality of output side transistors of a current mirror circuit are provided to produce reference currents for R, G and B that are selectively switched by a first, a second and a third changeover switch circuit. As a result, the D/A converter blocks corresponding to the respective terminal pins dynamically produce drive currents for the respective terminal pins so as to correspond to the dot arrangement of R, G and B on the organic EL panel.

REFERENCES:
patent: 6756738 (2004-06-01), Maede et al.
patent: 6972526 (2005-12-01), Abe
patent: 7084577 (2006-08-01), Maede et al.
patent: 2007/0278965 (2007-12-01), Maede et al.

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