DRIVING METHOD OF LIQUID CRYSTAL DISPLAY DEVICE
First Claim
1. A driving method of a liquid crystal display device comprising a plurality of pixels and a plurality of signal lines, the driving method comprising a step of:
- inverting a polarity of an image signal, which is input to the plurality of pixels from the plurality of signal lines, every one frame period,wherein, in each frame period, the polarity of the image signal is different between any two pixels which are adjacent to each other with one of the plurality of signal lines positioned therebetween,wherein each of the plurality of pixels comprises a liquid crystal element comprising a pixel electrode and a transistor comprising a first terminal and a second terminal, andwherein the transistor comprises a semiconductor having a wider band gap than a silicon semiconductor.
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Abstract
An object is to provide a driving method of a liquid crystal display device with a low power consumption and a high image quality. A pixel includes a liquid crystal element and a transistor which controls supply of an image signal to the liquid crystal element. The transistor includes, in a channel formation region, a semiconductor which has a wider band gap than a silicon semiconductor and has a lower intrinsic carrier density than silicon, and has an extremely low off-state current. In inversion driving of pixels, image signals having opposite polarities are input to a pair of signal lines between which a pixel electrode is disposed. By employing such a structure, the quality of the displayed image can be increased even in the absence of a capacitor in the pixel.
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Citations
34 Claims
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1. A driving method of a liquid crystal display device comprising a plurality of pixels and a plurality of signal lines, the driving method comprising a step of:
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inverting a polarity of an image signal, which is input to the plurality of pixels from the plurality of signal lines, every one frame period, wherein, in each frame period, the polarity of the image signal is different between any two pixels which are adjacent to each other with one of the plurality of signal lines positioned therebetween, wherein each of the plurality of pixels comprises a liquid crystal element comprising a pixel electrode and a transistor comprising a first terminal and a second terminal, and wherein the transistor comprises a semiconductor having a wider band gap than a silicon semiconductor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A driving method of a liquid crystal display device comprising a plurality of pixels, a plurality of signal lines, and a plurality of scan lines, the driving method comprising a step of:
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inverting a polarity of an image signal, which is input to the plurality of pixels from the plurality of signal lines, every one frame period, wherein, in each frame period, the polarity of the image signal is different between any two pixels which are adjacent to each other with one of the plurality of signal lines positioned therebetween, wherein, in each frame period, the polarity of the image signal is the same in any two pixels which are adjacent to each other with one of the plurality of scan lines positioned therebetween, wherein each of the plurality of pixels comprises a liquid crystal element comprising a pixel electrode and a transistor comprising a first terminal and a second terminal, and wherein the transistor comprises a semiconductor having a wider band gap than a silicon semiconductor. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A driving method of a liquid crystal display device comprising a plurality of pixels, a plurality of signal lines, and a plurality of scan lines, the driving method comprising a step of:
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inverting a polarity of an image signal, which is input to the plurality of pixels from the plurality of signal lines, every one frame period, wherein, in each frame period, the polarity of the image signal is different between any two pixels which are adjacent to each other with one of the plurality of signal lines positioned therebetween, wherein, in each frame period, the polarity of the image signal is different between any two pixels which are adjacent to each other with one of the plurality of scan lines positioned therebetween, wherein each of the plurality of pixels comprises a liquid crystal element comprising a pixel electrode and a transistor comprising a first terminal and a second terminal, and wherein the transistor comprises a semiconductor having a wider band gap than a silicon semiconductor. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. A liquid crystal display device comprising a plurality of pixels over a substrate, at least one of the plurality of pixels comprising:
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a signal line over the substrate; a gate electrode over the substrate; a gate insulating film over the gate electrode, the gate insulating film comprising a metal oxide of a Group 13 element; a semiconductor film over the gate insulating film, the semiconductor film having a band gap wider than a silicon semiconductor; a first conductive film and a second conductive film over the semiconductor film; and a liquid crystal element comprising a pixel electrode, wherein the first conductive film is electrically connected to the signal line and the second conductive film is electrically connected to the pixel electrode, and wherein a proportion of oxygen of the metal oxide is higher than a stoichiometric value. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34)
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Specification