Semiconductor device and driving method thereof
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorHajime Kimura
Life of this patent
Estimating the term…
Abstract
A semiconductor device in which a signal current can be written quickly in a current source circuit of a current input type. A signal current is written after performing a pre-charge operation, thus the writing is performed quickly. In the pre-charge operation, a current is supplied to a plurality of circuits. The current size is set according to the number of the circuits to be supplied the current, which means the steady state can be obtained quickly. Note that a current may be supplied to a circuit other than the one to be input a signal in the pre-charge operation.
Claims17
A semiconductor device comprising:
- a signal line;
- a plurality of circuits each including a switch and a transistor which is connectable to the signal line through the switch;
- and
- a current source supplying a first current to transistors of M circuits selected from the plurality of circuits in a pre-charge period, and supplying a second current to transistors of N circuits selected from the plurality of circuits in a setting period,
- wherein M is two or more, and
- wherein N and M are natural numbers except for zero, and M is greater than N.
A semiconductor device comprising:
- a signal line;
- a plurality of circuits each including a switch and a transistor which is connectable to the signal line through the switch;
- and
- a current source supplying a first current to transistors of M circuits selected from the plurality of circuits in a pre-charge period, and supplying a second current to transistors of N circuits selected from the plurality of circuits except the M circuits in a setting period,
- wherein N and M are natural numbers except for zero, and M is greater than N.
A semiconductor device comprising:
- a signal line;
- a plurality of circuits each including a switch and a transistor which is connectable to the signal line through the switch;
- and
- a current source supplying a first current to transistors of M circuits selected from the plurality of circuits in a pre-charge period, and supplying a second current to transistors of N circuits selected from the plurality of circuits in a setting period,
- wherein the size ratio of the first current to the second current is M:N, and
- wherein N and M are natural numbers except for zero, and M is greater than N.
A driving method of a semiconductor device comprising a signal line;
- and a plurality of circuits each including a switch and a transistor which is connectable to the signal line through the switch, comprising:
- supplying a first current to transistors of M circuits selected from the plurality of the circuits;
- and
- supplying a second current to transistors of N circuits selected among the plurality of circuits except the M circuits,
- wherein N and M are natural numbers except for zero, and M is greater than N.
Dependencies are inferred from the claim text.