Driver circuit, display device including the driver circuit, and electronic appliance including the display device
First Claim
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1. A driver circuit comprising:
- a shift register comprising an inverter circuit and a switch,wherein the inverter circuit comprises a first thin film transistor and a second thin film transistor,wherein the switch comprises a third thin film transistor,wherein the first to third thin film transistors each are depletion-mode transistors, andwherein an amplitude voltage of clock signals for driving the third thin film transistor is higher than a power supply voltage for driving the inverter circuit.
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Abstract
An object of the present invention is to provide a driver circuit including a normally-on thin film transistor, which driver circuit ensures a small malfunction and highly reliable operation. The driver circuit includes a static shift register including an inverter circuit having a first transistor and a second transistor, and a switch including a third transistor. The first to third transistors each include a semiconductor layer of an oxide semiconductor and are depletion-mode transistors. An amplitude voltage of clock signals for driving the third transistor is higher than a power supply voltage for driving the inverter circuit.
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Citations
32 Claims
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1. A driver circuit comprising:
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a shift register comprising an inverter circuit and a switch, wherein the inverter circuit comprises a first thin film transistor and a second thin film transistor, wherein the switch comprises a third thin film transistor, wherein the first to third thin film transistors each are depletion-mode transistors, and wherein an amplitude voltage of clock signals for driving the third thin film transistor is higher than a power supply voltage for driving the inverter circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A driver circuit comprising:
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a shift register comprising an inverter circuit and a switch; and a demultiplexer circuit connected to an output terminal of the shift register, wherein the inverter circuit comprises a first thin film transistor and a second thin film transistor, wherein the switch comprises a third thin film transistor, wherein the first to third thin film transistors each are depletion-mode transistors, wherein an amplitude voltage of clock signals for driving the third thin film transistor is higher than a power supply voltage for driving the inverter circuit, and wherein output terminals of the demultiplexer circuit are each connected to a fourth thin film transistor for holding a potential of the output terminal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for driving a driver circuit, the driver circuit including a shift register comprising an inverter circuit and a switch,
wherein the inverter circuit comprises a first thin film transistor and a second thin film transistor, wherein the switch comprises a third thin film transistor, and wherein the first to third thin film transistors each are depletion-mode transistors, said method comprising the step of: -
inputting clock signals to the switch, wherein an amplitude voltage of the clock signals for driving the third thin film transistor is higher than a power supply voltage for driving the inverter circuit. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification