Solid-state image pickup device and electronic information apparatus
AssigneeSharp Kabushiki Kaisha
InventorEiji Koyama
Life of this patent
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Abstract
A solid-state image pickup device is provided which comprises an electric charge accumulation region capable of accumulating electric charges, a reset transistor comprising a first terminal and a second terminal, in which an electric charge discharge potential is applied to the first terminal and the second terminal is connected to the electric charge accumulation region, and a source follower circuit comprising a driver transistor having the same structure as that of the reset transistor. An electric charge accumulation voltage of the electric charge accumulation region can be set to the electric charge discharge potential through the reset transistor. An output voltage from the source follower circuit is the electric charge discharge potential.
Claims18
A solid-state image pickup device, comprising:
- an electric charge accumulation region capable of accumulating electric charges;
- a reset transistor comprising a first terminal and a second terminal, wherein an electric charge discharge potential is applied to the first terminal and the second terminal is connected to the electric charge accumulation region;
- and
- a source follower circuit comprising a driver transistor having the same structure as that of the reset transistor,
- wherein an electric charge accumulation voltage of the electric charge accumulation region can be set to the electric charge discharge potential through the reset transistor, and
- an output voltage from the source follower circuit is the electric charge discharge potential.
A solid-state image pickup device, comprising:
- a reset transistor comprising a control terminal, a first drive terminal, and a second drive terminal, wherein a reset control voltage is applied to the control terminal, a reset voltage is applied to the first drive terminal, and an electric charge accumulation voltage is applied to the second drive terminal, and the electric charge accumulation voltage is set to be the reset voltage through the reset transistor by the reset control voltage;
- a source follower circuit comprising:
- a driver transistor fabricated by the same process as that for the reset transistor and having the same transistor structure as that of the reset transistor, wherein the driver transistor has a control terminal, a first drive terminal, and a second drive terminal, and the control terminal is connected to the first drive terminal;
- and a constant current source section connected to the second drive terminal of the driver transistor and the first drive terminal of the reset transistor,
- wherein an output voltage generated by the source follower circuit is applied to the first drive terminal of the reset transistor.
Dependencies are inferred from the claim text.