Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver
Reexamination Certificate
2008-05-27
2008-05-27
Zweizig, Jeffrey (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Current driver
Reexamination Certificate
active
07378882
ABSTRACT:
The invention provides a semiconductor device having a transistor that can supply a proper current to a load (EL pixel and signal line) without being influenced by variations. A voltage of each terminal of a transistor is controlled by a feedback circuit using an amplifier circuit. A current Idata is inputted from a current source circuit to the transistor, and the feedback circuit sets a gate-source voltage that the transistor requires for supplying the current Idata. The feedback circuit controls the transistor to operate in a saturation region. Then, a gate voltage required for supplying the current Idata is set. When using the transistor set in this manner, a proper current can be supplied to a load (EL pixel and signal line). Note that a required gate voltage can be set quickly because of an amplifier circuit.
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Fish & Richardson P.C.
Semiconductor Energy Laboratory Co,. Ltd.
Zweizig Jeffrey
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