Semiconductor device and driving method thereof
First Claim
1. A semiconductor device comprising:
- a photodiode configured to receive a light;
a first transistor comprising a gate and a back gate; and
a second transistor,wherein one of a source and a drain of the second transistor is directly connected to the photodiode,wherein the other of the source and the drain of the second transistor is directly connected to the gate of the first transistor,wherein the photodiode is configured to generate an electric signal in accordance with intensity of the light,wherein the first transistor is configured to convert a charge in the gate of the first transistor into an output signal,wherein the first transistor is turned on when a first potential is input to the gate of the first transistor, andwherein the charge is changed in accordance with the electric signal.
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Abstract
A semiconductor device including photosensor capable of imaging with high resolution is disclosed. The semiconductor device includes the photosensor having a photodiode, a first transistor, and a second transistor. The photodiode generates an electric signal in accordance with the intensity of light. The first transistor stores charge in a gate thereof and converts the stored charge into an output signal. The second transistor transfers the electric signal generated by the photodiode to the gate of the first transistor and holds the charge stored in the gate of the first transistor. The first transistor has a back gate and the threshold voltage thereof is changed by changing the potential of the back gate.
163 Citations
23 Claims
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1. A semiconductor device comprising:
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a photodiode configured to receive a light; a first transistor comprising a gate and a back gate; and a second transistor, wherein one of a source and a drain of the second transistor is directly connected to the photodiode, wherein the other of the source and the drain of the second transistor is directly connected to the gate of the first transistor, wherein the photodiode is configured to generate an electric signal in accordance with intensity of the light, wherein the first transistor is configured to convert a charge in the gate of the first transistor into an output signal, wherein the first transistor is turned on when a first potential is input to the gate of the first transistor, and wherein the charge is changed in accordance with the electric signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A semiconductor device comprising:
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a photodiode configured to receive a light; a first transistor comprising a gate and a back gate; and a second transistor, wherein one of a source and a drain of the second transistor is directly connected to the photodiode, wherein the other of the source and the drain of the second transistor is directly connected to the gate of the first transistor, wherein the first transistor is configured to convert a charge in the gate of the first transistor into an output signal, and wherein the output signal is an electric signal in accordance with intensity of the light. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A semiconductor device comprising:
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a photodiode; a first transistor comprising a gate and a back gate; and a second transistor, wherein one of a source and a drain of the second transistor is directly connected to the photodiode, wherein the other of the source and the drain of the second transistor is directly connected to the gate of the first transistor, wherein the gate of the first transistor is electrically connected to the photodiode, and wherein the first transistor is configured to convert a charge in the gate of the first transistor into an output signal. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification