LIQUID CRYSTAL DISPLAY DEVICE, AND METHOD AND CIRCUIT FOR DRIVING FOR LIQUID CRYSTAL DISPLAY DEVICE
First Claim
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1. A liquid crystal display device comprising:
- a liquid crystal display section having a plurality of scan electrodes, a plurality of image signal electrodes which are perpendicular to the scan electrodes, a plurality of pixel electrodes arranged in a matrix with the scan electrodes and the image signal electrodes, a plurality of switching elements for transmitting an image signal to the plurality of pixel electrodes, a plurality of common electrodes which are next to the plurality of pixel electrodes, and a plurality of storage capacitor electrodes;
an image signal drive circuit coupled to the liquid crystal display section;
a scan signal drive circuit coupled to the liquid crystal display section;
a synchronous circuit coupled to the image signal drive circuit and the scan signal drive circuit; and
a common electrode potential control circuit, coupled to the synchronous circuit and the liquid display section, for changing an electric potential of the common electrode into a pulse shape, just after the scan signal drive circuit has scanned all the scan electrodes and the image signal has been transmitted to the pixel electrodes,wherein electric potentials of the image signal, during an electric charge hold drive, are never an electric potential of the image signal in a stable display state during static drive,wherein the electric potential of the common electrode just before the scan signal drive circuit starts scanning a first scan electrode of the scan electrodes is different from the electric potential of the common electrode just after the scan signal drive circuit has scanned all the scan electrodes and the image signal has been transmitted to the pixel electrodes, but before the electric potential of the common electrode is changed into the pulse shape, andwherein hold data is substantially equal to a sum of charges held between the pixel electrodes and the common electrodes and charges held between the pixel electrodes and the storage capacitance electrodes.
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Abstract
A liquid crystal display device includes a display section, an image signal drive circuit, a scan signal drive circuit, a common electrode potential control circuit, and a synchronous circuit. The display section has scan electrodes, image signal electrodes, a plurality of pixel electrodes arranged in a matrix, a plurality of switching elements for transmitting an image signal to the pixel electrodes, and a common electrode. The common electrode potential control circuit changes an electric potential of the common electrode into a pulse shape, after the scan signal drive circuit has scanned all the scan electrodes and the image signal has been transmitted to the pixel electrodes. Otherwise, the image signal is overdriven. Otherwise, torque for returning to a no-voltage-application state is increased.
80 Citations
23 Claims
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1. A liquid crystal display device comprising:
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a liquid crystal display section having a plurality of scan electrodes, a plurality of image signal electrodes which are perpendicular to the scan electrodes, a plurality of pixel electrodes arranged in a matrix with the scan electrodes and the image signal electrodes, a plurality of switching elements for transmitting an image signal to the plurality of pixel electrodes, a plurality of common electrodes which are next to the plurality of pixel electrodes, and a plurality of storage capacitor electrodes; an image signal drive circuit coupled to the liquid crystal display section; a scan signal drive circuit coupled to the liquid crystal display section; a synchronous circuit coupled to the image signal drive circuit and the scan signal drive circuit; and a common electrode potential control circuit, coupled to the synchronous circuit and the liquid display section, for changing an electric potential of the common electrode into a pulse shape, just after the scan signal drive circuit has scanned all the scan electrodes and the image signal has been transmitted to the pixel electrodes, wherein electric potentials of the image signal, during an electric charge hold drive, are never an electric potential of the image signal in a stable display state during static drive, wherein the electric potential of the common electrode just before the scan signal drive circuit starts scanning a first scan electrode of the scan electrodes is different from the electric potential of the common electrode just after the scan signal drive circuit has scanned all the scan electrodes and the image signal has been transmitted to the pixel electrodes, but before the electric potential of the common electrode is changed into the pulse shape, and wherein hold data is substantially equal to a sum of charges held between the pixel electrodes and the common electrodes and charges held between the pixel electrodes and the storage capacitance electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification
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Current AssigneeNLT Technologies, Ltd.
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Original AssigneeNEC Corporation
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InventorsTAKATORI, Kenichi
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current348/51
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CPC Class CodesG09G 2310/0235 Field-sequential colour dis...G09G 2320/0252 Improving the response speedG09G 2320/041 Temperature compensationG09G 2340/16 Determination of a pixel da...G09G 3/3655 Details of drivers for coun...
