ELEMENT SUBSTRATE AND LIGHT EMITTING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a light emitting device and an element substrate which are capable of suppressing unevenness in the luminance 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 capacitive element.

SOLUTION: A depletion type transistor is used as the 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 signals of 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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