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

• US 10,488,979 B2
• Filed: 04/12/2019
• Issued: 11/26/2019
• Est. Priority Date: 08/06/2008
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Japan Display Incorporated
• Inventors: Hashimoto, Shinya
• Primary Examiner(s): Karimi, Pegeman
• Application Number:
  US16/382,427
• Publication Number:
  US 20190235695A1
• Time in Patent Office: 228 Days
• 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 alternating conductors H05K2201/097
• 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;

a touch panel having a plurality of X electrodes formed along a X direction and a plurality of Y electrodes formed along a Y direction, and

a flexible printed circuit board connecting the touch panel, the flexible printed circuit board having a first signal line supplying a signal to the plurality of X electrodes and a second signal line supplying a signal to the plurality of Y electrodes

wherein

the flexible printed circuit board has a first conductive layer and a second conductive layer,

a first portion of the first signal line is made of the first conductive layer,

a second portion of the second signal line is made of the second conductive layer and intersects the first portion of the first signal line,

wherein the touch panel has a floating electrode which is made of the conductive layer of the plurality of X electrodes and the plurality of Y electrodes, and does not connect the plurality of X electrodes and the plurality of Y electrodes,

wherein the plurality of X electrodes has a first edge which does not extend along the X direction,

wherein the plurality of Y electrodes has a second edge which does not extend along the Y direction,

wherein the floating electrode has a third edge which extends along the first edge and a fourth edge which extends along the second edge,

wherein the floating electrode does not overlap the X electrodes and the Y electrodes, and

wherein the floating electrode does not electrically connect with the first and second signal line.

2. The touch panel according to claim 1, wherein the floating electrode does not overlap with the plurality of X electrodes and the plurality of Y electrodes.

3. The touch panel according to claim 1, wherein either one of the plurality of X electrodes and the plurality of Y electrodes is made of a transparent conductive film.

4. The touch panel according to claim 1, wherein the plurality of X electrodes and the plurality of Y electrodes are formed with an insulation film sandwiched therebetween.

5. The touch panel according to claim 1, wherein the touch panel has a plurality of first connection terminals which is made of a metal material.

6. A display devise comprising:

a display panel;

touch panel having a plurality of X electrodes formed along a pair of long sides of the touch panel and a plurality of Y electrodes formed along a pair of short sides of the touch panel, and

a flexible printed circuit board connecting the touch panel, the flexible printed circuit board having a plurality of first signal lines electrically connecting the plurality of X electrodes and a plurality of second signal lines electrically connecting the plurality of Y electrodes

wherein

the flexible printed circuit board has a first conductive layer and a second conductive layer,

a first portion of the plurality of first signal lines is made of the first conductive layer,

a second portion of the plurality of second signal lines is made of the second conductive layer and intersects the first portion of the plurality of first signal lines,

the touch panel has a floating electrode which is between one of the plurality of X electrodes and one of the plurality of Y electrodes, and does not connect the plurality of X electrodes and the plurality of Y electrodes,

wherein the floating electrode has an edge which does not extend along the pair of long sides and the pair of short edges,

wherein the floating electrode does not overlap the X electrodes and the Y electrodes, and

wherein the floating electrode does not electrically connect with the first and second signal line.

7. The touch panel according to claim 6, wherein the floating electrode is formed adjacent the plurality of X electrodes.

8. The touch panel according to claim 6, wherein either one of the plurality of X electrodes and the plurality of Y electrodes is formed of a transparent conductive film.

9. The touch panel according to claim 6, wherein the plurality of X electrodes and the plurality Y electrodes are transparent conductive films which are formed with an insulation film sandwiched therebetween.

10. The touch panel according to claim 6, wherein the floating electrode is made of a transparent conductive film.

11. A display device comprising:

a display panel;

a touch panel having a plurality of X electrodes formed along a pair of long sides of the touch panel and a plurality of Y electrodes formed along a pair of short sides of the touch panel, and

a flexible printed circuit board connecting the touch panel, the flexible printed circuit board having a plurality of first signal lines supplying a signal to the plurality of X electrodes and a plurality of second signal lines supplying a signal to the plurality of Y electrodes

wherein

the flexible printed circuit board has a first conductive layer and a second conductive layer,

a first portion of the plurality of first signal lines is made of the first conductive layer,

a second portion of the plurality of second signal lines is made of the second conductive layer and intersects the first portion of the plurality of first signal lines,

wherein the touch panel has a plurality of floating electrodes which is formed adjacent the plurality of X electrodes respectively and does not contact the plurality of X electrodes,

wherein the plurality of floating electrodes has an edge respectively which does not extend along the pair of long sides and the pair of short edges, and

wherein the floating electrode does not overlap the X electrodes and the Y electrodes, and

wherein the floating electrode does not electrically connect with the first and second signal line.

12. The touch panel according to claim 11, wherein the floating electrode does not overlap with the plurality of X electrodes and the plurality of Y electrodes.

13. The touch panel according to claim 11, wherein either one of the plurality of X electrodes and the plurality of Y electrodes is made of a transparent conductive film.

14. The touch panel according to claim 11, wherein the plurality of X electrodes and the plurality of Y electrodes are formed with an insulation film sandwiched therebetween.

15. The touch panel according to claim 11, wherein the floating electrode is made of a transparent conductive film.