Semiconductor device
First Claim
1. A semiconductor device comprising a circuit which controls by a transistor a current to be supplied to a load, wherein a source or a drain of the transistor is connected to a current source circuit, and wherein an amplifier circuit is provided which controls a gate-source voltage and a drain-source voltage of the transistor are controlled when a current is supplied from the current source circuit to the transistor.
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Accused Products
Abstract
A semiconductor device is provided in which a transistor which supplies a current to a load (an EL pixel and a signal line) can supply an accurate current without being affected by a variation. A voltage of each terminal of a transistor is controlled by using a feedback circuit using an amplifier circuit. A current Idata is inputted from a current source circuit to a transistor and a gate-source voltage (a source potential) required for the transistor to flow the current Idata is set by using the feedback circuit. The feedback circuit is controlled to operate so that a drain potential of the transistor becomes a predetermined potential. Then, a gate voltage required to flow the current Idata is set. By using the set transistor, an accurate current can be supplied to the load (an EL element and a signal line). As a drain potential can be controlled, the kink effect can be reduced.
76 Citations
16 Claims
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1. A semiconductor device comprising a circuit which controls by a transistor a current to be supplied to a load,
wherein a source or a drain of the transistor is connected to a current source circuit, and wherein an amplifier circuit is provided which controls a gate-source voltage and a drain-source voltage of the transistor are controlled when a current is supplied from the current source circuit to the transistor.
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2. A semiconductor device comprising a circuit which controls by a transistor a current to be supplied to a load,
wherein a source or a drain of the transistor is connected to a current source circuit, and wherein an amplifier circuit is provided which stabilizes a gate potential of the transistor so that a drain potential or a source potential of the transistor becomes a predetermine potential.
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3. A semiconductor device comprising a circuit which controls by a transistor a current to be supplied to a load,
wherein a source or a drain of the transistor is connected to a current source circuit, and wherein a feedback circuit which stabilizes a gate potential of the transistor so that a drain potential or a source potential of the transistor becomes a predetermined potential.
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4. A semiconductor device comprising a transistor which controls a current to be supplied to a load and an operational amplifier,
wherein a non-inverting input terminal of the operational amplifier is connected to a drain terminal side of the transistor connected to a current source circuit, and wherein an output terminal of the operational amplifier is connected to the gate terminal.
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5. -12. (canceled)
Specification