Liquid crystal display device

Patent metadata

Field	Value
Publication number	US-2016202835-A1
Application number	US-201614987358-A
Country	US
Kind code	A1
Filing date	Jan 4, 2016
Priority date	Jan 9, 2015
Publication date	Jul 14, 2016
Grant date	—

Abstract

A liquid crystal display device includes a liquid crystal element array having liquid crystal display elements arranged in matrix, scanning lines arranged in each row of the liquid crystal element array and supplying a scanning signal to the liquid crystal display elements in a corresponding row, signal lines arranged in each column of the liquid crystal element array and supplying an image signal to the liquid crystal display elements in a corresponding column, drive electrodes arranged in the column of the liquid crystal element array and to which a drive signal to detect a touch is supplied, a signal line drive circuit arranged along one side of the liquid crystal element array parallel to the row of the liquid crystal element array and forming the image signal, and a first electrode drive circuit arranged along the other side of the liquid crystal element array and forming the drive signal.

First claim

The invention is claimed as follows:

1 . A liquid crystal display device comprising:
a liquid crystal element array having a plurality of liquid crystal display elements arranged in a matrix form; a plurality of scanning lines which are arranged in each row of the liquid crystal element array and supply a scanning signal to the plurality of liquid crystal display elements arranged in a corresponding row; a plurality of signal lines which are arranged in each column of the liquid crystal element array and supply an image signal to the plurality of liquid crystal display elements arranged in a corresponding column; a plurality of drive electrodes which are arranged in the column of the liquid crystal element array and to which a drive signal to detect a touch is supplied; a signal line drive circuit which is arranged along one side of the liquid crystal element array parallel to the row of the liquid crystal element array and forms the image signal; and a first electrode drive circuit which is arranged along the other side of the liquid crystal element array parallel to the row of the liquid crystal element array and forms the drive signal, wherein the drive signal is supplied from the first electrode drive circuit to the drive electrodes arranged in the column of the liquid crystal element array on the other side of the liquid crystal element array.

2 . The liquid crystal display device according to claim 1 , further comprising:
a first voltage wire to supply a first voltage; a second voltage wire to supply a second voltage; and a third voltage wire to supply a third voltage, wherein the first electrode drive circuit is connected to the first voltage wire, the second voltage wire and the third voltage wire and supplies the drive signal whose voltage periodically changes between a voltage based on a voltage of the first voltage wire and a voltage based on a voltage of the second voltage wire to a selected drive electrode among the plurality of drive electrodes, and the first electrode drive circuit supplies a voltage based on a voltage of the third voltage wire to a non-selected drive electrode among the plurality of drive electrodes.

3 . The liquid crystal display device according to claim 2 ,
wherein each of the first voltage wire, the second voltage wire and the third voltage wire is arranged along the other side of the liquid crystal element array.

4 . The liquid crystal display device according to claim 3 ,
wherein the second voltage and the third voltage have the same voltage value.

5 . The liquid crystal display device according to claim 4 ,
wherein a line width of the third voltage wire is smaller than a line width of the second voltage wire.

6 . The liquid crystal display device according to claim 1 , further comprising:
a second electrode drive circuit which is arranged along the one side of the liquid crystal element array and forms the drive signal, wherein, to the drive electrodes arranged in the column of the liquid crystal element array, the drive signal is supplied from the second electrode drive circuit on the one side of the liquid crystal element array and the drive signal is supplied from the first electrode drive circuit on the other side of the liquid crystal element array.

7 . The liquid crystal display device according to claim 6 , further comprising:
first and second voltage wires to supply a first voltage; third and fourth voltage wires to supply a second voltage; and fifth and sixth voltage wires to supply a third voltage, wherein the first electrode drive circuit is connected to the first voltage wire, the third voltage wire and the fifth voltage wire and supplies the drive signal whose voltage periodically changes between a voltage based on a voltage of the first voltage wire and a voltage based on a voltage of the third voltage wire to a selected drive electrode among the plurality of drive electrodes, the first electrode drive circuit supplies a voltage based on a voltage of the fifth voltage wire to a non-selected drive electrode among the plurality of drive electrodes, the second electrode drive circuit is connected to the second voltage wire, the fourth voltage wire and the sixth voltage wire and supplies the drive signal whose voltage periodically changes between a voltage based on a voltage of the second voltage wire and a voltage based on a voltage of the fourth voltage wire to the selected drive electrode among the plurality of drive electrodes, and the second electrode drive circuit supplies a voltage based on a voltage of the sixth voltage wire to the non-selected drive electrode among the plurality of drive electrodes.

8 . The liquid crystal display device according to claim 7 ,
wherein the second voltage and the third voltage have the same voltage value and a line width of the sixth voltage wire is smaller than a line width of the fourth voltage wire.

9 . The liquid crystal display device according to claim 6 , further comprising:
first and second voltage wires to supply a first voltage; third and fourth voltage wires to supply a second voltage; and a fifth voltage wire to supply a third voltage, wherein the first electrode drive circuit is connected to the first voltage wire, the third voltage wire and the fifth voltage wire and supplies the drive signal whose voltage periodically changes between a voltage based on a voltage of the first voltage wire and a voltage based on a voltage of the third voltage wire to a selected drive electrode among a plurality of touch detection drive electrodes, the first electrode drive circuit supplies a voltage based on a voltage of the fifth voltage wire to a non-selected drive electrode among the plurality of drive electrodes, the second electrode drive circuit is connected to the second voltage wire and the fourth voltage wire and supplies the drive signal whose voltage periodically changes between a voltage based on a voltage of the second voltage wire and a voltage based on a voltage of the fourth voltage wire to the selected drive electrode among the plurality of touch detection drive electrodes, and the second electrode drive circuit is in a high-impedance state with respect to the non-selected drive electrode among the plurality of drive electrodes.

10 . The liquid crystal display device according to claim 9 ,
wherein the first electrode drive circuit includes a plurality of first unit electrode drive circuits corresponding to each of the plurality of drive electrodes and connected to the first voltage wire, the third voltage wire and the fifth voltage wire, each of the plurality of first unit electrode drive circuits includes a first switch connected between a corresponding drive electrode and the first voltage wire, a second switch connected between a corresponding drive electrode and the third voltage wire, a third switch connected between a corresponding drive electrode and the fifth voltage wire, and a first control circuit, the first switch, the second switch and the third switch are controlled by the first control circuit so as to be alternatively brought into conduction, the second electrode drive circuit includes a plurality of second unit electrode drive circuits corresponding to each of the plurality of drive electrodes and connected to the second voltage wire and the fourth voltage wire, each of the plurality of second unit electrode drive circuits includes a fourth switch connected between a corresponding drive electrode and the second voltage wire, a fifth switch connected between a corresponding drive electrode and the fourth voltage wire, and a second control circuit, and each of the fourth switch and the fifth switch is controlled by the second contr

Assignees

• Japan Display Inc

Inventors

• Mizuhashi Hiroshi
• Teranishi Yasuyuki
• Fukushima Toshiaki
• Ito Daisuke
• Koide Gen
• Katsuta Tadayoshi

Classifications

• G09G3/3611 Primary

  Control of matrices with row and column drivers · CPC title

• G02F1/136286

  Wiring, e.g. gate line, drain line · CPC title

• G02F1/1345

  Conductors connecting electrodes to cell terminals · CPC title

• G02F1/1368

  in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} · CPC title

• G06F2203/04101

  2.5D-digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface and also measures the distance of the input means within a short range in the Z direction, possibly with a separate measurement setup · CPC title