Display device with touch panel having X, Y and dummy electrodes

• US 8,994,682 B2
• Filed: 10/17/2013
• Issued: 03/31/2015
• Est. Priority Date: 08/06/2008
• Status: Active Grant

• Current Assignee: Paneltouch Technologies LLC (Touch Display LLC)
• Original Assignee: Japan Display Incorporated, Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Inventors: Hashimoto, Shinya
• Primary Examiner(s): Karimi, Pegeman
• Application Number:
  US14/056,504
• Publication Number:
  US 20140043292A1
• Time in Patent Office: 530 Days
• Field of Search: 345/173, 345/174, 178 1801- 1803, 200/512, 200/600
• US Class Current: 345/173
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G06F 1/16 Constructional details or arrangements
• CPC Class Codes: G06F 2203/04102 Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: H05K 1/0216 Reduction of cross-talk, noise or electromagnetic interference grounding H05K1/0215
• CPC Class Codes: H05K 1/11 Printed elements for providing electric connections to or between printed circuits
• CPC Class Codes: H05K 1/118 specially for flexible printed circuits, e.g. using folded portions
• CPC Class Codes: H05K 2201/09245 Crossing layout
• CPC Class Codes: H05K 2201/09254 Branched layout
• CPC Class Codes: H05K 3/361 Assembling flexible printed circuits with other printed circuits

Abstract

A display device includes a display panel, and an electrostatic capacitive type touch panel which is formed in an overlapping manner with the display panel. A plurality of X electrodes and a plurality of Y electrodes intersecting with the X electrodes. A first signal line supplies signals to the X electrodes, a second signal line supplies signals to the Y electrodes, and the first signal line and the second signal line are formed on a flexible printed circuit board. A dummy electrode is formed adjacent to an electrode portion of each X electrode and electrode portion of each Y electrode, the dummy electrode does not overlap the X electrode and the Y electrode, and the dummy electrode does not electrically connect with the first and second signal lines.

Claims

1. A display device comprising:

a display panel;

an electrostatic capacitive type touch panel which is formed in an overlapping manner with the display panel, the electrostatic capacitive type touch panel having a substantially rectangular shape with a pair of long sides and a pair of short sides;

a plurality of X electrodes and a plurality of Y electrodes intersecting with the X electrodes which are formed on the electrostatic capacitive type touch panel, each X electrode having intersecting portions where the X electrode and the Y electrode overlap with each other and the electrode portions each of which is formed between two intersecting portions, and each Y electrode having intersecting portions where the X electrode and the Y electrode overlap with each other and electrode portions each of which is formed between two intersecting portions;

a first signal line having a first portion which extends along at least one of the short and long sides of the electrostatic capacitive type touch panel and having at least one connection terminal at one of the short sides, the first signal line supplying signals to the X electrodes;

a second signal line having a first portion which extends along at least one of the short and long sides of the electrostatic capacitive type touch panel and having at least one connection terminal at the one of the short sides, the second signal line supplying signals to the Y electrodes; and

a flexible printed circuit board on which a second portion of the first signal line and a second portion of the second signal line are formed;

wherein a dummy electrode is formed adjacent to the electrode portion of said each X electrode;

wherein the dummy electrode does not overlap the X electrode and the Y electrode; and

wherein the dummy electrode does not electrically connect with the first and second signal lines;

wherein the electrode portions of the X electrode are decreased in size with respect to a size of the electrode portions of the Y electrode so as to be smaller in area than an area of the electrode portions of the Y electrodes;

wherein the dummy electrode is formed in a space that is formed by the decreased size of the electrode portion of the X electrode;

wherein the flexible printed circuit board is disposed above an upper surface of the one of the short sides of the electrostatic capacitive type touch panel where the connection terminals are arranged; and

wherein the second portions of the first and second signal lines on the flexible printed circuit board are connected with the connection terminals of the first portions of the first and second signal lines at the one of the short sides of the electrostatic capacitive touch panel.

2. A display device according to claim 1, wherein either one of the X electrode and the Y electrode is formed of a transparent conductive film.

3. A display device according to claim 1, wherein the X electrode and the Y electrode are transparent conductive films which are formed with an insulation film sandwiched theretween.

4. A display device according to claim 1, wherein the dummy electrode which is formed adjacent to the each X electrode is a transparent conductive formed on the same layer as the electrode portion.

5. A display device comprising:

a display panel having long sides and short sides;

an electrostatic capacitive type touch panel having long sides and short sides which is adhered to the display panel;

a plurality of X electrodes and a plurality of Y electrodes intersecting with the X electrodes which are formed on the electrostatic capacitive type touch panel, each X electrode having intersecting portions where the X electrode and the Y electrode overlap with each other and individual electrodes each of which is formed between two intersecting portions and has a width wider than a width of the intersecting portion, and each Y electrode having intersecting portions where the X electrode and the Y electrode overlap with each other and individual electrodes each of which is formed between two intersecting portions and has a width wider than a width of the intersecting portion;

a first signal line having a first portion, which extends along at least one of the short and long sides of the electrostatic capacitive type touch panel and having at least one connection terminal at one of the short sides, the first signal line supplying signals to a first plurality of the X electrodes;

a second signal line having a first portion which extends along at least one of the short and long sides of the electrostatic capacitive type touch panel and having at least one connection terminal at the one of the short sides, the second signal line supplying signal to the Y electrodes; and

a flexible printed circuit board on which a second portion of the first signal line and a second portion of the second line are formed;

wherein the X electrodes are formed along the long sides of the touch panel;

wherein the Y electrodes are formed along the short sides of the touch panel;

wherein the electrode portions of one of the X electrodes are decreased in size with respect to a size of the electrode portions of one of the Y electrodes so as to be smaller in area than an area of the electrode portions of the one of the Y electrodes;

wherein a dummy electrode is formed adjacent to the electrode portion of said each X electrode in a space that is formed by the decreased size of the electrode portion of the X electrode;

wherein the dummy electrode does not overlap the X electrode and the Y electrode;

wherein the dummy electrode does not electrically connect with the first and second signal lines;

wherein the flexible printed circuit board is disposed above an upper surface of the one of the short sides of the electrostatic capacitive type touch panel where the connection terminals are arranged; and

wherein the second portions of the first and second signal lines on the flexible printed circuit board are connected with the connection terminals of the first portions of the first and second signal lines at the one of the short sides of the electrostatic touch panel.

6. A display device according to claim 5, wherein either one of the X electrode and the Y electrode is formed of a transparent conductive film.

7. A display device according to claim 5, wherein the X electrode and the Y electrode are transparent conductive films which are formed with an insulation film sandwiched therebetween.

8. A display device according to claim 7, wherein the dummy electrode is a transparent conductive film formed on the same layer as the electrode portion of the X electrode.

9. A display device comprising:

a display panel;

an electrostatic capacitive type touch panel which is mounted on the display panel, the electrostatic capacitive type touch panel having a substantially rectangular shape with a pair of long sides and a pair of short sides;

a plurality of X electrodes and a plurality of Y electrodes intersecting with the X electrodes which are formed on the electrostatic capacitive type touch panel, each X electrode having intersecting portions where the X electrode and the Y electrode overlap with each other and individual electrode portions each of which is formed between two intersecting portions and has a width wider than a width of the intersecting portion, and each Y electrode having intersecting portions where the X electrode and the Y electrode overlap with each other and individual electrode portions each of which is formed between two intersecting portions and has a width wider than a width of the intersecting portion;

a first line having a first portion which extends along at least one of the short and long sides of the electrostatic capacitive type touch panel and having at least one connection terminal at one of the short sides, the first line supplying signals to the X electrodes from both ends of said each X electrode;

a second line having a first portion which extends along at least one of the short and long sides of the electrostatic capacitive type touch panel and having at least one connection terminal at the one of the short sides, the second line supplying signals to the Y electrodes from both ends of said each Y electrode; and

a flexible printed circuit board on which a second portion of the first line and a second portion of the second line are formed;

wherein the electrode portion of the X electrodes is decreased in size with respect to a size of the electrode portions of the Y electrode so as to be smaller in area than the electrode portion of the Y electrodes, a dummy electrode is formed adjacent to the electrode portion of said each X electrode in a space that is formed by the decreased size of the electrode portion of the X electrode;

wherein the dummy electrode does not overlap the X electrode and the Y electrode;

wherein the dummy electrode does not electrically connect with the first and second signal line;

wherein the flexible printed circuit board is disposed above an upper surface of the one of the short sides of the electrostatic capacitive type touch panel where the connection terminals are arranged; and

wherein the second portions of the first and second lines on the flexible printed circuit board are connected with the connection terminals of the first portions of the first and second lines at the one of the short sides of the electrostatic capacitive touch panel.

10. A display device according to claim 9, wherein either one of the X electrode and the Y electrode is formed of a transparent conductive film.

11. A display device according to claim 9, wherein the X electrode and the Y electrode are transparent conductive films which are formed with an insulation film sandwiched therebetween.

12. A display device according to claim 9, wherein the dummy electrode which is a transparent conductive film formed on the same layer as the electrode portion.

13. A display device according to claim 9, wherein the first line and the second line are respectively branched into a plurality of paths on the flexible printed circuit board, wherein the branched paths of the first line are electrically connected to the both ends of a respective X electrode, and the branched paths of the second line are electrically connected to the both ends of a respective Y electrode.