Element substrate and light emitting device

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

2006-11-28

2006-11-28

Wong, Don (Department: 2821)

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

C315S169100, C315S169200

Reexamination Certificate

active

07141934

ABSTRACT:
A light emitting device and an element substrate which are capable of suppressing variations in the luminance intensity of a light emitting element among pixels due to characteristic variations of a driving transistor without suppressing off-current of a switching transistor low and increasing storage capacity of a capacitor. According to the invention, a depletion mode transistor is used as a driving transistor. The gate of the driving transistor is fixed in its potential or connected to the source or drain thereof to operate in a saturation region with a constant current flow. A current controlling transistor which operates in a linear region is connected in series to the driving transistor, and a video signal for transmitting a light emission or non-emission of a pixel is inputted to the gate of the current controlling transistor through a switching transistor.

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“MOS Transistor's Terminals”, pp. 1-15, www.engr.sjsu.edu/freeman/BasicMOS.html.

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