Element substrate and light emitting device

Details Element substrate and light emitting device Element substrate and light emitting device

2006-10-17

2006-10-17

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

C315S169100, C345S076000

Reexamination Certificate

active

07122969

ABSTRACT:
No need of lowering off-current of a switching transistor, fewer luminance variations of a light emitting element between pixels due to characteristic variations of a driving transistor, and less risk of steps due to increase in the number of wirings. A video signal for light emission or non-emission of a pixel is input to a gate of a current controlling transistor operated in a linear region, which is connected in series with the driving transistor, through a switching transistor. Since a voltage Vds between a source and a drain of the current controlling transistor is small, small changes in a voltage Vgs between a gate and a source thereof do not affect a current flowing in a load. The current flowing in the light emitting element is determined by the driving transistor operated in a saturation region, and a fixed potential is input to the gate thereof during light emission.

REFERENCES:
patent: 5517207 (1996-05-01), Kawada et al.
patent: 5684365 (1997-11-01), Tang et al.
patent: 6542222 (2003-04-01), Tsuji et al.
patent: 6972743 (2005-12-01), Kim et al.
patent: 0 717 446 (1996-06-01), None
patent: 08-234683 (1996-09-01), None

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