SEMICONDUCTOR DEVICE
First Claim
1. A semiconductor device comprising:
- a photosensor comprising;
a photodiode;
a first transistor having a gate, the gate of the first transistor being connected to one electrode of the photodiode;
a second transistor having a source and a drain, one of the source and the drain of the second transistor being connected to one of a source and a drain of the first transistor; and
a read control circuit including a read control transistor having a source and a drain, one of the source and the drain of the read control transistor being connected to the other of the source and the drain of the second transistor,wherein at least one of the first transistor, the second transistor, and the read control transistor includes an oxide semiconductor in a semiconductor layer.
1 Assignment
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Accused Products
Abstract
An object is to achieve low-power consumption by reducing the off-state current of a transistor in a photosensor. A semiconductor device including a photosensor having a photodiode, a first transistor, and a second transistor; and a read control circuit including a read control transistor, in which the photodiode has a function of supplying charge based on incident light to a gate of the first transistor; the first transistor has a function of storing charge supplied to its gate and converting the charge stored into an output signal; the second transistor has a function of controlling reading of the output signal; the read control transistor functions as a resistor converting the output signal into a voltage signal; and semiconductor layers of the first transistor, the second transistor, and the read control transistor are formed using an oxide semiconductor.
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Citations
32 Claims
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1. A semiconductor device comprising:
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a photosensor comprising; a photodiode; a first transistor having a gate, the gate of the first transistor being connected to one electrode of the photodiode; a second transistor having a source and a drain, one of the source and the drain of the second transistor being connected to one of a source and a drain of the first transistor; and a read control circuit including a read control transistor having a source and a drain, one of the source and the drain of the read control transistor being connected to the other of the source and the drain of the second transistor, wherein at least one of the first transistor, the second transistor, and the read control transistor includes an oxide semiconductor in a semiconductor layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A semiconductor device comprising:
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a photosensor comprising; a photodiode; a first transistor having a source and a drain, one of the source and the drain of the first transistor being connected to one electrode of the photodiode; a second transistor having a gate, the gate of the second transistor being connected to the other of the source and the drain of the first transistor; a third transistor having a source and a drain, one of the source and the drain of the third transistor being connected to one of a source and a drain of the second transistor; and a read control circuit including a read control transistor having a source and a drain, one of the source and the drain of the read control transistor being connected to the other of the source and the drain of the third transistor, wherein at least one of the first transistor, the second transistor, the third transistor, and the read control transistor includes an oxide semiconductor in a semiconductor layer. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A semiconductor device comprising:
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a photosensor comprising; a photodiode; a first transistor having a gate, the gate of the first transistor being connected to one electrode of the photodiode; a second transistor having a source and a drain, one of the source and the drain of the second transistor being connected to one of a source and a drain of the first transistor; and a read control circuit including a read control transistor having a source and a drain, one of the source and the drain of the read control transistor being connected to the other of the source and the drain of the first transistor, wherein at least one of the first transistor, the second transistor, and the read control transistor includes an oxide semiconductor in a semiconductor layer. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. A semiconductor device comprising:
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a photosensor comprising; a photodiode; a first transistor having a source and a drain, one of the source and the drain of the first transistor being connected to one electrode of the photodiode; a second transistor having a gate, the gate of the second transistor being connected to the other of the source and the drain of the first transistor; a third transistor having a source and a drain, one of the source and the drain of the third transistor being connected to one of a source and a drain of the second transistor; and a read control circuit including a read control transistor having a source and a drain, one of the source and the drain of the read control transistor being connected to the other of the source and the drain of the second transistor, wherein at least one of the first transistor, the second transistor, the third transistor, and the read control transistor includes an oxide semiconductor in a semiconductor layer. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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Specification