Liquid crystal display apparatus
First Claim
1. A liquid crystal display apparatus having a pair of substrates of which at least one substrate is transparent and a liquid crystal layer sandwiched between the substrates, comprising:
- a plurality of first scanning electrodes formed on one of the substrates;
a plurality of signal electrodes intersecting in a matrix form with said plurality of first scanning electrodes;
a plurality of second scanning electrodes provided along said first scanning electrodes or said signal electrodes;
wherein the display apparatus further comprises, within each of the regions surrounded by said plurality of first scanning electrodes and said plurality of signal electrodes;
(a) a data holding circuit connected to a corresponding first scanning electrode, signal electrode, and second scanning electrode for fetching and storing display data from the signal electrode in response to voltages applied to the first and the second scanning electrodes;
(b) a capacitor connected to said data holding circuit;
(c) a switching device connected to said capacitor and having a switching operation thereof controlled by a voltage of the capacitor; and
(d) a display electrode connected to said switching device;
wherein a drive voltage of the liquid crystal display apparatus is an alternating current voltage having a period which is shorter than a period of fetching by the display data holding circuit.
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Abstract
A liquid crystal display apparatus having a pair of substrates of which at least one substrate is transparent and a liquid crystal layer sandwiched between the substrates including a plurality of first scanning electrodes formed on one of the substrates, a plurality of signal electrodes intersecting in a matrix form with the plurality of first scanning electrodes, a plurality of second scanning electrodes provided along the first scanning electrodes or the signal electrodes. The display apparatus including within each of the regions surrounded by the plurality of first scanning electrodes and the plurality of signal electrodes: (a) a data holding circuit, signal electrode, and second scanning electrode, (b) a capacitor, (c) a switching device and (d) a display electrode. A drive voltage of the liquid crystal display apparatus is an alternating current voltage having a period which is shorter than a period of fetching by the display data holding circuit.
40 Citations
9 Claims
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1. A liquid crystal display apparatus having a pair of substrates of which at least one substrate is transparent and a liquid crystal layer sandwiched between the substrates, comprising:
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a plurality of first scanning electrodes formed on one of the substrates;
a plurality of signal electrodes intersecting in a matrix form with said plurality of first scanning electrodes;
a plurality of second scanning electrodes provided along said first scanning electrodes or said signal electrodes;
wherein the display apparatus further comprises, within each of the regions surrounded by said plurality of first scanning electrodes and said plurality of signal electrodes;
(a) a data holding circuit connected to a corresponding first scanning electrode, signal electrode, and second scanning electrode for fetching and storing display data from the signal electrode in response to voltages applied to the first and the second scanning electrodes;
(b) a capacitor connected to said data holding circuit;
(c) a switching device connected to said capacitor and having a switching operation thereof controlled by a voltage of the capacitor; and
(d) a display electrode connected to said switching device;
wherein a drive voltage of the liquid crystal display apparatus is an alternating current voltage having a period which is shorter than a period of fetching by the display data holding circuit. - View Dependent Claims (2, 3, 4)
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5. A liquid crystal display apparatus having a pair of substrates of which at least one substrate is transparent and a liquid crystal layer sandwiched between the substrates, comprising:
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a plurality of scanning electrodes formed on one of the substrates; and
a plurality of signal electrodes intersecting in a matrix form with said plurality of scanning electrodes;
wherein the display apparatus further comprises, within each of the regions surrounded by said plurality of scanning electrodes and said plurality of signal electrodes;
(a) a display data holding circuit having one of an inverse stagger structure and a coplanar structure, and connected to a corresponding scanning electrode and signal electrode, for fetching and storing display data from a signal electrode in response to a scanning signal for holding a display image without updating the display data while a power supply to the display apparatus is maintained, said power supply applying an alternating current voltage;
(b) a switching device connected to said display data holding circuit and having a switching operation thereof controlled by the display data holding circuit, said switching device including a first switching device controlling connection and disconnection between a first electrode applied an alternating current voltage having the same phase as said power supply and a display electrode, and a second switching device connecting and disconnecting between a reference electrode applying a reference voltage to the display electrode, and said display electrode; and
(c) a display electrode connected to said switching device, said first and second switching devices being controlled so that only one of said first and second switching devices is turned ON depending upon the digital display data stored in said display data holding circuit. - View Dependent Claims (6, 7, 8, 9)
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Specification