Liquid crystal display device
First Claim
1. A semiconductor device comprising:
- a transistor including a gate electrode electrically connected to a scan line, a first electrode electrically connected to a signal line, and a second electrode electrically connected to a pixel electrode;
a first capacitive element including one electrode electrically connected to the second electrode, and the other electrode electrically connected to a capacitance line; and
a second capacitive element including one electrode electrically connected to the second electrode,wherein the second capacitive element has a capacitance value variable by adjusting an electric potential of the capacitance line depending upon whether an image to be displayed by the pixel electrode is a still image or a moving image.
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Abstract
An object of the present invention is to provide a liquid crystal display device which allows a desirable storage capacitor to be ensured in a pixel without decreasing the aperture ratio in response to changes in frame frequency. In a liquid crystal display device including a pixel transistor and two capacitive elements using an oxide semiconductor material in each pixel, one of the capacitive elements comprises a light-transmitting material to improve the aperture ratio of the pixel. Furthermore, through the use of characteristics of the light-transmitting capacitive element, the size of the storage capacitor in the pixel is varied by adjusting the voltage value of a capacitance value in response to the frame frequency varied depending on images displayed.
169 Citations
11 Claims
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1. A semiconductor device comprising:
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a transistor including a gate electrode electrically connected to a scan line, a first electrode electrically connected to a signal line, and a second electrode electrically connected to a pixel electrode; a first capacitive element including one electrode electrically connected to the second electrode, and the other electrode electrically connected to a capacitance line; and a second capacitive element including one electrode electrically connected to the second electrode, wherein the second capacitive element has a capacitance value variable by adjusting an electric potential of the capacitance line depending upon whether an image to be displayed by the pixel electrode is a still image or a moving image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for driving a display device at frame frequencies comprising:
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a transistor including a gate electrode electrically connected to a scan line, a first electrode electrically connected to a signal line, and a second electrode electrically connected to a pixel electrode; a first capacitive element including one electrode electrically connected to the second electrode, and the other electrode electrically connected to a capacitance line; and a second capacitive element including one electrode electrically connected to the second electrode, the method comprising a step of; adjusting an electric potential of the capacitance line depending upon the frame frequencies so that a capacitance value of the second capacitive element is adjusted. - View Dependent Claims (10, 11)
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Specification