Back to results
US 8,525,819 B2Granted
Driving method of a semiconductor device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorHajime Kimura
Life of this patent
Estimating the term…
Abstract
A horizontal scanning period is divided into n parts (n is a natural number), so that horizontal scanning can be performed (n×y) times in one frame period. That is, n signals can be outputted from each pixel, and storage times of the n signals are different from one another. Then, since a signal suited to the intensity of light irradiated to each pixel can be selected, information of an object can be accurately read.
Claims24
A semiconductor device comprising:
- a first driver circuit;
- a second driver circuit;
- a third driver circuit;
- and
- a pixel portion comprising a first transistor, a second transistor, a third transistor and a photoelectric transducer,
- wherein a gate of the first transistor is electrically connected to the photoelectric transducer,
- wherein one of a source and a drain of the second transistor is electrically connected to the gate of the first transistor,
- wherein one of a source and a drain of the third transistor is electrically connected to the first transistor,
- wherein one of a source and a drain of the first transistor is electrically connected to a first line,
- wherein a gate of the second transistor is electrically connected to a second line,
- wherein a gate of the third transistor is electrically connected to a third line,
- wherein the other of the source and the drain of the first transistor is electrically connected to a fourth line,
- wherein the first line is electrically connected to the first driver circuit,
- wherein the second line is electrically connected to the second driver circuit,
- wherein the third line is electrically connected to the third driver circuit,
- wherein the third driver circuit is configured to output a first signal comprising a first pulse having a first pulse width to the third line in one frame period,
- wherein the second driver circuit is configured to output a second signal comprising a second pulse having a second pulse width longer than the first pulse width to the second line in the one frame period,
- wherein the first transistor is configured to output a third signal and a fourth signal to the first line in the one frame period, and
- wherein each of the third signal and the fourth signal is a signal depending on a potential of the gate of the first transistor.
16 more elements
A semiconductor device comprising:
- a first driver circuit comprising a first capacitor and a second capacitor;
- a second driver circuit;
- a third driver circuit;
- and
- a pixel portion comprising a first transistor, a second transistor, a third transistor and a photoelectric transducer,
- wherein a gate of the first transistor is electrically connected to the photoelectric transducer,
- wherein one of a source and a drain of the second transistor is electrically connected to the gate of the first transistor,
- wherein one of a source and a drain of the third transistor is electrically connected to the first transistor,
- wherein one of a source and a drain of the first transistor is electrically connected to a first line,
- wherein a gate of the second transistor is electrically connected to a second line,
- wherein a gate of the third transistor is electrically connected to a third line,
- wherein the other of the source and the drain of the first transistor is electrically connected to a fourth line,
- wherein the first line is electrically connected to the first capacitor,
- wherein the first line is electrically connected to the second capacitor,
- wherein the second line is electrically connected to the second driver circuit,
- wherein the third line is electrically connected to the third driver circuit,
- wherein the third driver circuit is configured to output a first signal comprising a first pulse having a first pulse width to the third line in one frame period,
- wherein the second driver circuit is configured to output a second signal comprising a second pulse having a second pulse width longer than the first pulse width to the second line in the one frame period,
- wherein the first transistor is configured to output a third signal and a fourth signal to the first line in the one frame period, and
- wherein each of the third signal and the fourth signal is a signal depending on a potential of the gate of the first transistor.
17 more elements
A semiconductor device comprising:
- a pixel portion comprising a first transistor, a second transistor, a third transistor and a photoelectric transducer,
- wherein a gate of the first transistor is electrically connected to the photoelectric transducer,
- wherein one of a source and a drain of the second transistor is electrically connected to the gate of the first transistor,
- wherein one of a source and a drain of the third transistor is electrically connected to the first transistor,
- wherein one of a source and a drain of the first transistor is electrically connected to a first line,
- wherein a gate of the second transistor is electrically connected to a second line,
- wherein a gate of the third transistor is electrically connected to a third line,
- wherein the other of the source and the drain of the first transistor is electrically connected to a fourth line,
- wherein the third line is supplied with a first signal comprising a first pulse having a first pulse width in one frame period,
- wherein the second line is supplied with a second signal comprising a second pulse having a second pulse width longer than the first pulse width in the one frame period,
- wherein the first transistor is configured to output a third signal and a fourth signal to the first line in the one frame period, and
- wherein each of the third signal and the fourth signal is a signal depending on a potential of the gate of the first transistor.
9 more elements
Dependencies are inferred from the claim text.