VARIABLE CAPACITOR AND LIQUID CRYSTAL DISPLAY DEVICE
First Claim
1. A variable capacitor comprising:
- a first electrode;
a second electrode;
an insulating layer and an oxide semiconductor layer both interposed between the first electrode and the second electrode, the oxide semiconductor layer being electrically connected to one of the first electrode and the second electrode.
1 Assignment
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Accused Products
Abstract
A variable capacitor with high controllability and stable operation is provided. A liquid crystal display device with low power consumption and excellent display quality is provided. A variable capacitor is formed using two overlapping electrodes of different areas and a substantially intrinsic semiconductor layer formed in contact with one of the electrodes. According to the voltage applied to the electrodes, the semiconductor layer can be considered as a dielectric or a conductor, thereby allowing varying the capacitance of the variable capacitor. The variable capacitor is applied to pixels of a liquid crystal display device configured to switch between a low capacitance and a high capacitance of the variable capacitor in accordance with a moving image display mode and a still image display mode, respectively, whereby a liquid crystal display device with low power consumption and excellent display quality can be realized.
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Citations
20 Claims
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1. A variable capacitor comprising:
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a first electrode; a second electrode; an insulating layer and an oxide semiconductor layer both interposed between the first electrode and the second electrode, the oxide semiconductor layer being electrically connected to one of the first electrode and the second electrode. - View Dependent Claims (2, 3, 4, 5)
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6. A variable capacitor comprising:
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a first electrode; a second electrode; an insulating layer and an oxide semiconductor layer both interposed between the first electrode and the second electrode, the oxide semiconductor layer being electrically connected to the second electrode, wherein an area where the first electrode and the oxide semiconductor layer overlap with each other is larger than an area where the first electrode, the oxide semiconductor layer, and the second electrode overlap with one another. - View Dependent Claims (7, 8, 9, 10)
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11. A liquid crystal display device comprising:
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a pixel comprising; a transistor comprising a gate, a source and a drain; a variable capacitor comprising; a first electrode and a second electrode, the first electrode being electrically connected to one of the source and the drain of the transistor; an insulating layer and an oxide semiconductor layer both interposed between the first electrode and the second electrode, the oxide semiconductor layer being electrically connected to one of the first electrode and the second electrode; and a liquid crystal element comprising an electrode electrically connected to the second electrode of the variable capacitor; a first driver circuit; a first wiring electrically connected to the first driver circuit and to the gate of the transistor; a second driver circuit; a second wiring electrically connected to the second driver circuit and to the other of the source and the drain of the transistor; a third driver circuit; and a third wiring electrically connected to the third driver circuit and to the first electrode of the variable capacitor. - View Dependent Claims (12, 13, 14, 15)
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16. A liquid crystal display device comprising:
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a pixel comprising; a transistor comprising a gate, a source and a drain; a variable capacitor comprising; a first electrode and a second electrode, the first electrode being electrically connected to one of the source and the drain of the transistor; an insulating layer and an oxide semiconductor layer both interposed between the first electrode and the second electrode, the oxide semiconductor layer being electrically connected to one of the first electrode and the second electrode; and a liquid crystal element comprising an electrode electrically connected to the second electrode of the variable capacitor; a memory circuit configured to store image signals corresponding to successive frame periods; and a comparison circuit configured to compare the image signals corresponding to the successive frame periods; wherein the liquid crystal display device is configured to apply a voltage to the first electrode of the variable capacitor in accordance with a result of a comparison between the image signals corresponding to the successive frame periods. - View Dependent Claims (17, 18, 19, 20)
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Specification