Semiconductor device, and display device and electronic device utilizing the same
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsHajime Kimura, Yutaka Shionoiri
Life of this patent
Estimating the term…
Abstract
A semiconductor device having a normal function means is provided, in which the amplitude of an output signal is prevented from being decreased even when a digital circuit using transistors having one conductivity is employed. By turning OFF a diode-connected transistor 101, the gate terminal of a first transistor 102 is brought into a floating state. At this time, the first transistor 102 is ON and its gate-source voltage is stored in a capacitor. Then, when a potential at the source terminal of the first transistor 102 is increased, a potential at the gate terminal of the first transistor 102 is increased as well by bootstrap effect. As a result, the amplitude of an output signal is prevented from being decreased.
Claims38
A semiconductor device comprising a first transistor, a second transistor, a third transistor, a first input terminal, and a second input terminal, said semiconductor device characterized in that:
- wherein a source of the first transistor is electrically connected to a drain of the second transistor,
- a drain of the third transistor is electrically connected to a gate of the first transistor,
- the first input terminal is electrically connected to a gate of the third transistor and to a gate of the second transistor, and
- the second input terminal is electrically connected to the gate of the first transistor through a rectifying element.
A semiconductor device comprising a first transistor, a second transistor, a third transistor, a first input terminal, a second input terminal, and a capacitor,
- wherein a source of the first transistor is electrically connected to a drain of the second transistor,
- a drain of the third transistor is electrically connected to a gate of the first transistor,
- the first input terminal is electrically connected to a gate of the third transistor and to a gate of the second transistor,
- the second input terminal is electrically connected to the gate of the first transistor through a rectifying element,
- either terminal of the capacitor is electrically connected to the gate of the first transistor, and
- the other terminal of the capacitor is electrically connected to the source of the first transistor.
An electronic device including a circuit comprising:
- a first transistor;
- a second transistor whose drain is electrically connected to a source of the first transistor;
- a third transistor whose drain is electrically connected to a gate of the first transistor;
- a first input terminal which is electrically connected to a gate of the second transistor and to a gate of the third transistor;
- and
- a second input terminal which is electrically connected to the gate of the first transistor through a rectifying element.
An electronic device including a circuit comprising:
- a first transistor;
- a second transistor whose drain is electrically connected to a source of the first transistor;
- a third transistor whose drain is electrically connected to a gate of the first transistor;
- a first input terminal which is electrically connected to a gate of the second transistor and to a gate of the third transistor;
- a second input terminal which is electrically connected to the gate of the first transistor through a rectifying element;
- and
- a capacitor which is electrically connected between the gate and the source of the first transistor.
Dependencies are inferred from the claim text.