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

• US 10,088,950 B2
• Filed: 04/25/2018
• Issued: 10/02/2018
• Est. Priority Date: 08/06/2008
• Status: Active Grant

• Current Assignee: Paneltouch Technologies 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:
  US15/961,960
• Publication Number:
  US 20180239492A1
• Time in Patent Office: 160 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. An electrostatic capacitive type touch panel comprising:

a substrate including a pair of long sides extending along an X direction and a pair of short sides extending along a Y direction;

a plurality of X electrodes extending along the X direction,

a plurality of Y electrodes extending along the Y direction,

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 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 supplying signals to the Y electrodes;

a plurality of first connection terminals of the first portion of the first signal line and the second signal line; and

a flexible printed circuit board having a second portion of the first and the second signal line, a plurality of second connection terminals, and a plurality of third connection terminals,

wherein the second connection terminal is electrically connected with the third connection terminal respectively by the second portion,

wherein the plurality of second connection terminals is disposed above the plurality of first connection terminal and electrically connected with the plurality of first connection terminals respectively,

wherein the flexible printed circuit board has a plurality of intersecting lines of the second portion,

wherein the flexible printed circuit board has a plurality conductive layers which includes second portion of the first signal line and the second signal line, and are electrically connected each other by a through hole which is formed at an end portion of the intersecting lines,

wherein the X electrode and the Y electrode are made of a conductive layer,

wherein the substrate has a floating electrode which is made of the conductive layer of the X electrode and the Y electrode, and does not connect the X electrode and the Y electrode,

wherein the X electrode has a first edge which does not extend along the X direction,

wherein the Y electrode has a second edge which does not extend along the Y direction, and

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

2. The electrostatic capacitive type touch panel according to claim 1, wherein the floating electrode does not overlap with the X electrode and the Y electrode.

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

4. The electrostatic capacitive type touch panel according to claim 1, wherein the X electrode and the Y electrode are formed with an insulation film sandwiched therebetween.

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

6. An electrostatic capacitive type touch panel comprising:

a substrate having 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 substrate,

a first signal line having a first portion which extends along at least one of the short and long sides of the substrate 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 substrate supplying signals to the Y electrodes;

a plurality of first connection terminals of the first portion of the first signal line and the second signal line arranged above the substrate; and

a flexible printed circuit board having a second portion of the first and the second signal line, a plurality of second connection terminals, and a plurality of third connection terminals being electrically connected with the second connection terminals respectively by the second portion; and

a shielding line surrounding the first and the second signal line of the second portion,

wherein the plurality of second connection terminals is overlapped with the plurality of first connection terminals and electrically connected with the plurality of first connection terminals respectively,

wherein the flexible printed circuit board has a plurality of intersection lines of the second portion,

wherein the substrate has a floating electrode which is between the X electrode and the Y electrode, and does not connect the X electrode and the Y electrode, and

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

7. The electrostatic capacitive type touch panel according to claim 6, wherein the floating electrode is formed adjacent the X electrode.

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

9. The electrostatic capacitive type touch panel according to claim 6, wherein the X electrode and the Y electrode are transparent conductive films which are formed with an insulation film sandwiched therebetween.

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

11. An electrostatic capacitive type touch panel comprising:

a substrate including 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 formed on the substrate,

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 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 supplying signals to the Y electrodes;

a plurality of first connection terminals of the first portion of the first signal line and the second signal line;

a flexible printed circuit board having a second portion of the first and the second signal line, a plurality of second connection terminals, and a plurality of third connection terminals,

wherein the second connection terminal is electrically connected with the third connection terminal respectively by the second portion,

wherein the plurality of second connection terminals is disposed above the plurality of first connection terminal and electrically connected with the plurality of first connection terminals respectively,

wherein the flexible printed circuit board has a plurality of intersecting lines of the second portion,

wherein the flexible printed circuit board has a plurality of conductive layers which include the second portion of the first signal line and the second signal line, and are electrically connected to each other by a through hole which is formed at an end portion of the intersecting lines,

wherein the substrate has a floating electrode which is formed adjacent the X electrode, and

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

12. The electrostatic capacitive type touch panel according to claim 11, wherein the floating electrode does not overlap with the X electrode and the Y electrode.

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

14. The electrostatic capacitive type touch panel according to claim 11, wherein the X electrode and the Y electrode are formed with an insulation film sandwiched therebetween.

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