LIQUID CRYSTAL DISPLAY DEVICE AND METHOD OF DRIVING THE SAME
First Claim
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1. A liquid crystal display device, comprising:
- a substrate;
a plurality of first electrodes arranged in a matrix of rows and columns on the substrate;
scan lines extending along with the first electrodes arranged in the row direction;
signal lines extending along with the first electrodes arranged in the column direction;
a pixel switch arranged in an intersection portion of the scan line and the column line to switch a connection between the signal line and the first electrode by a scan signal applied to the scan line;
a scan line driving circuit to sequentially scan the scan lines;
a plurality of second electrodes arranged so as to counter the first electrodes through an insulating layer and extend along with the pixels in the row direction;
a first voltage supply line to supply a first voltage to the second electrode;
a second voltage supply line to supply a second voltage to the second electrode;
a control circuit;
a first switch circuit arranged between the first and second voltage supply lines and the second electrodes to switch a connection between the first voltage supply line and the second electrodes, and a connection between the second voltage supply line and the second electrodes by a control signal outputted from the control circuit;
a second switch circuit arranged between the first voltage supply line and the signal line to switch a connection between the first voltage supply line and the signal line by the control signal outputted from the control circuit; and
a gate open circuit to receive signals from the scan line driving circuit and the control circuit, the gate open circuit supplying a signal to switch on the pixel witch to the scan line.
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Abstract
A liquid crystal display device includes a plurality of common electrodes arranged so as to counter pixel electrodes extending in the row direction on a substrate. First and second voltage supply lines to supply first and second voltages to the common electrodes are connected with the common electrodes through a first switch circuit. A second switch circuit is arranged between the first voltage supply line and signal lines to switch a connection between the first voltage supply line and the signal lines. A gate open circuit is connected to scan lines to simultaneously supply a signal to switch on the pixel electrodes to all the scan lines. In case the power supply of the liquid crystal display device is turned off, a control circuit starts the power OFF driving operation to set the potential of the pixel electrode and the common electrode to substantially same by switching the first and second switch circuits.
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Citations
18 Claims
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1. A liquid crystal display device, comprising:
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a substrate; a plurality of first electrodes arranged in a matrix of rows and columns on the substrate; scan lines extending along with the first electrodes arranged in the row direction; signal lines extending along with the first electrodes arranged in the column direction; a pixel switch arranged in an intersection portion of the scan line and the column line to switch a connection between the signal line and the first electrode by a scan signal applied to the scan line; a scan line driving circuit to sequentially scan the scan lines; a plurality of second electrodes arranged so as to counter the first electrodes through an insulating layer and extend along with the pixels in the row direction; a first voltage supply line to supply a first voltage to the second electrode; a second voltage supply line to supply a second voltage to the second electrode; a control circuit; a first switch circuit arranged between the first and second voltage supply lines and the second electrodes to switch a connection between the first voltage supply line and the second electrodes, and a connection between the second voltage supply line and the second electrodes by a control signal outputted from the control circuit; a second switch circuit arranged between the first voltage supply line and the signal line to switch a connection between the first voltage supply line and the signal line by the control signal outputted from the control circuit; and a gate open circuit to receive signals from the scan line driving circuit and the control circuit, the gate open circuit supplying a signal to switch on the pixel witch to the scan line. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A liquid crystal display device, comprising:
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a first substrate; a second substrate opposite the first substrate including; a plurality of pixel electrodes arranged in a matrix of rows and columns, scan lines extending along with the pixel electrodes arranged in the row direction, signal lines extending along the pixel electrodes arranged in the column direction, a pixel switch arranged in an intersection portion of the scan line and the column line to switch a connection between the signal line and the pixel electrode by a scan signal applied to the scan line, a scan line driving circuit to sequentially scan the scan lines, a source line driving circuit to supply picture signals to the signal lines, a plurality of common electrodes arranged so as to counter the pixel electrodes through an insulating layer extending along with the pixels in the row direction, a first voltage supply line to supply a first voltage to the common electrode, a second voltage supply line to supply a second voltage to the common electrode, a control circuit, a first switch circuit arranged between the first and second voltage supply lines and the common electrodes to switch a connection between the first voltage supply line and the common electrodes, and a connection between the second voltage supply line and the common electrodes by a control signal outputted from the control circuit, a second switch circuit arranged between the first voltage supply line and the signal line to switch a connection between the first voltage supply line and the signal line by the control signal outputted from the control circuit, and a gate open circuit to receive signals from the scan line driving circuit and the control circuit, the gate open circuit supplying a signal to switch on the pixel electrode, a liquid crystal layer held between the first and second substrates; wherein in case the power supply of the liquid crystal display device is turned off, the control circuit starts the power OFF driving operation to set the potential of the pixel electrode and the voltage of the common electrodes substantially equal, and the power supply to the control circuit is turned off after a predetermined time passes. - View Dependent Claims (9, 10, 11)
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12. A method of driving a liquid crystal display device including;
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a substrate, a plurality of first electrodes arranged in a matrix of rows and columns on the substrate, scan lines extending along with the first electrodes arranged in the row direction, signal lines extending along with the first electrodes arranged in the column direction, a pixel switch arranged in an intersection portion of the scan line and the column line to switch a connection between the signal line and the first electrode by a scan signal supplied to the scan line, a scan line driving circuit to sequentially scan the scan lines, a plurality of second electrodes arranged so as to counter the first electrodes in the row direction through an insulating layer, a first voltage supply line to supply a first voltage to the second electrode, a second voltage supply line to supply a second voltage to the second electrode, a control circuit, a first switch circuit arranged between the first and second voltage supply lines and the second electrodes to switch a connection between the first voltage supply line and the second electrodes, and a connection between the second voltage supply line and the second electrodes by a control signal outputted from the control circuit, a second switch circuit arranged between the first voltage supply line and the signal line to switch a connection between the first voltage supply line and the signal line by the control signal outputted from the control circuit, and a gate open circuit to receive signals from the scan line driving circuit and the control circuit and supply a signal to switch on the pixel switch, the method comprising the steps;
when the power supply to the liquid crystal display device is turned off,(a) connecting the first voltage supply line with the second electrode by controlling the first switch circuit; (b) connecting the first voltage supply line with the signal line by controlling the second switch circuit; and (c) supplying a signal to simultaneously switch on the pixel switches connected with all the signal lines to the gate open circuit. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification
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Current AssigneeJapan Display Incorporated
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Original AssigneeToshiba Mobile Display Company Limited (Japan Display Incorporated)
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InventorsHARADA, Kenji
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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 Current345/211
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CPC Class CodesG02F 1/13306 Circuit arrangements or dri...G09G 2310/0245 Clearing or presetting the ...G09G 2310/0297 Special arrangements with m...G09G 3/3655 Details of drivers for coun...G09G 3/3677 suitable for active matrice...G09G 3/3688 suitable for active matrice...
