Method for driving liquid crystal display device
First Claim
1. A method for driving a liquid crystal display device comprising:
- in a period during which a moving image is displayed,turning on a pixel transistor of a pixel including an oxide semiconductor layer which is electrically connected to a driver circuit portion formed over a first substrate, so that an image signal is supplied to a pixel electrode; and
turning on a switching transistor including an oxide semiconductor layer which is electrically connected to a terminal portion formed over the first substrate, so that a common potential is supplied to a common electrode which is electrically connected to the terminal portion through the switching transistor and which is formed over a second substrate;
in a period during which a still image is displayed,turning off the pixel transistor so that the pixel electrode is in an electrically floating state; and
turning off the switching transistor so that the common electrode is in an electrically floating state; and
in a period during which a still image is switched to a moving image,a first step of supplying the common potential to the common electrode;
a second step of supplying a power supply voltage to the driver circuit portion;
a third step of supplying a clock signal to the driver circuit portion; and
a fourth step of supplying a start pulse signal to the driver circuit portion.
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Accused Products
Abstract
The liquid crystal display device includes a first substrate provided with a terminal portion, a switching transistor, a driver circuit portion, and a pixel circuit portion including a pixel transistor and a plurality of pixels, a second substrate provided with a common electrode electrically connected to the terminal portion through the switching transistor, and liquid crystal between a pixel electrode and the common electrode. In a period during which a still image is switched to a moving image, the following steps are sequentially performed: a first step of supplying the common potential to the common electrode; a second step of supplying a power supply voltage to the driver circuit portion; a third step of supplying a clock signal to the driver circuit portion; and a fourth step of supplying a start pulse signal to the driver circuit portion.
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Citations
17 Claims
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1. A method for driving a liquid crystal display device comprising:
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in a period during which a moving image is displayed, turning on a pixel transistor of a pixel including an oxide semiconductor layer which is electrically connected to a driver circuit portion formed over a first substrate, so that an image signal is supplied to a pixel electrode; and turning on a switching transistor including an oxide semiconductor layer which is electrically connected to a terminal portion formed over the first substrate, so that a common potential is supplied to a common electrode which is electrically connected to the terminal portion through the switching transistor and which is formed over a second substrate; in a period during which a still image is displayed, turning off the pixel transistor so that the pixel electrode is in an electrically floating state; and turning off the switching transistor so that the common electrode is in an electrically floating state; and in a period during which a still image is switched to a moving image, a first step of supplying the common potential to the common electrode; a second step of supplying a power supply voltage to the driver circuit portion; a third step of supplying a clock signal to the driver circuit portion; and a fourth step of supplying a start pulse signal to the driver circuit portion. - View Dependent Claims (2, 3)
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4. A method for driving a liquid crystal display device comprising:
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in a period during which a moving image is displayed, turning on a pixel transistor of a pixel including an oxide semiconductor layer which is electrically connected to a driver circuit portion formed over a first substrate, so that an image signal is supplied to a pixel electrode; and turning on a switching transistor including an oxide semiconductor layer which is electrically connected to a terminal portion formed over the first substrate, so that a common potential is supplied to a common electrode which is electrically connected to the terminal portion through the switching transistor and which is formed over a second substrate; in a period during which a still image is displayed, turning off the pixel transistor so that the pixel electrode is in an electrically floating state; and turning off the switching transistor so that the common electrode is in an electrically floating state; and in a period during which a moving image is switched to a still image, a first step of stopping supply of a start pulse signal to the driver circuit portion; a second step of stopping supply of a clock signal to the driver circuit portion; a third step of stopping supply of a power supply voltage to the driver circuit portion; and a fourth step of stopping supply of the common potential to the common electrode. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A method for driving a liquid crystal display device including a pixel transistor of a pixel which is electrically connected to a driving circuit portion, a pixel electrode which is electrically connected to the pixel transistor and a common electrode which is disposed to facing the pixel electrode, comprising steps of;
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in a period during which a still image is switched to a moving image, a first step of starting supply of a common potential to the common electrode; a second step of starting supply of a power supply voltage to the driver circuit portion; a third step of starting supply of a clock signal to the driver circuit portion; and a fourth step of starting supply of a start pulse signal to the driver circuit portion, wherein the first step to the fourth step are sequentially performed. - View Dependent Claims (11, 12, 13)
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14. A method for driving a liquid crystal display device including a pixel transistor of a pixel which is electrically connected to a driving circuit portion, a pixel electrode which is electrically connected to the pixel transistor and a common electrode which is disposed to facing the pixel electrode, comprising steps of;
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in a period during which a moving image is switched to a still image, a first step of stopping supply of a start pulse signal to the driver circuit portion; a second step of stopping supply of a clock signal to the driver circuit portion; a third step of stopping supply of a power supply voltage to the driver circuit portion; and a fourth step of stopping supply of a common potential to the common electrode, wherein the first step to the fourth step are sequentially performed. - View Dependent Claims (15, 16, 17)
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Specification