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US 8,411,240 B2Granted
Liquid crystal display device and method of driving liquid crystal display device
AssigneeJapan Display Central Inc.
InventorsKenji Harada, Takamitsu Fujimoto, Takahiro Oonuma
Life of this patent
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Abstract
According to one embodiment, a liquid crystal display device includes a first substrate, a second substrate, a liquid crystal layer, scanning lines, signal lines, pixel switches, first electrodes, a scanning line drive circuit, a second electrode, a voltage supply wiring, a control mechanism, a first switching mechanism, a second switching mechanism, and an output timing switching mechanism. The output timing switching mechanism is configured to simultaneously output a second scanning signal of switching the pixel switch into conductive state to the scanning lines, based on the control signal.
Claims7
A liquid crystal display device comprising:
- a first substrate;
- a second substrate arranged opposite to the first substrate;
- a liquid crystal layer held between the first substrate and the second substrate;
- a plurality of scanning lines provided on the first substrate and extending in a row direction;
- a plurality of signal lines provided on the first substrate and extending in a column direction;
- a plurality of pixel switches provided on the first substrate and electrically connected to the scanning lines and the signal lines;
- a plurality of first electrodes arranged in a matrix form on the first substrate and electrically connected to the pixel switches;
- a scanning line drive circuit configured to output a first scanning signal in order in association with the scanning lines;
- a second electrode provided on the first substrate or the second substrate and configured to apply an electric field produced between the second electrode and the first electrodes to the liquid crystal layer;
- a voltage supply wiring configured to supply a common voltage;
- a control mechanism configured to output a control signal;
- a first switching mechanism connected between the second electrode and the voltage supply wiring and configured to switch the second electrode and the voltage supply wiring into either conductive state or non-conductive state based on the control signal given by the control mechanism;
- a second switching mechanism connected between the signal lines and the voltage supply wiring and configured to switch the signal lines and the voltage supply wiring into either conductive state or non-conductive state based on the control signal given by the control mechanism;
- and
- an output timing switching mechanism configured to connect between the scanning lines and the scanning line drive circuit, receive the first scanning signal from the scanning line drive circuit and the control signal from the control mechanism, and simultaneously output a second scanning signal of switching the pixel switch into conductive state to the scanning lines, based on the control signal.
12 more elements
A method of driving a liquid crystal display device, the liquid crystal display device comprising:
- a first substrate;
- a second substrate arranged opposite to the first substrate;
- a liquid crystal layer held between the first substrate and the second substrate;
- a plurality of scanning lines provided on the first substrate and extending in a row direction;
- a plurality of signal lines provided on the first substrate and extending in a column direction;
- a plurality of pixel switches provided on the first substrate and electrically connected to the scanning lines and the signal lines;
- a plurality of first electrodes arranged in a matrix form on the first substrate and electrically connected to the pixel switches;
- a scanning line drive circuit configured to output a first scanning signal in order in association with the scanning lines;
- a second electrode provided on the first substrate or the second substrate and configured to apply an electric field produced between the second electrode and the first electrodes to the liquid crystal layer;
- a voltage supply wiring configured to supply a common voltage;
- a control mechanism configured to output a control signal;
- a first switching mechanism connected between the second electrode and the voltage supply wiring and configured to switch the second electrode and the voltage supply wiring into either conductive state or non-conductive state based on the control signal given by the control mechanism;
- a second switching mechanism connected between the signal lines and the voltage supply wiring and configured to switch the signal lines and the voltage supply wiring into either conductive state or non-conductive state based on the control signal given by the control mechanism;
- and an output timing switching mechanism configured to connect between the scanning lines and the scanning line drive circuit, receive the first scanning signal from the scanning line drive circuit and the control signal from the control mechanism, and simultaneously output a second scanning signal of switching the pixel switch into conductive state to the scanning lines, based on the control signal, the method comprising:
- outputting the control signal, when a power supply is turned off;
- and
- simultaneously outputting the second scanning signal to the scanning lines, switching the second electrode and the voltage supply wiring into conductive state, switching the signal lines and the voltage supply wiring into conductive state, and supplying the common voltage to the first electrodes and the second electrode, based on the control signal.
14 more elements
Dependencies are inferred from the claim text.