Touch panel and display device with touch panel

• US 8,681,121 B2
• Filed: 11/29/2010
• Issued: 03/25/2014
• Est. Priority Date: 12/01/2009
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Japan Display Incorporated, Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Inventors: Anno, Kouichi, Esaka, Hiroshi, Ikeda, Shouji
• Primary Examiner(s): Lao, Lun-Yi
• Assistant Examiner(s): Suteerawongsa, Jarurat
• Application Number:
  US12/954,976
• Publication Number:
  US 20110128246A1
• Time in Patent Office: 1,212 Days
• Field of Search: 345156-157, 345173-174, 178/18.01, 178/18.03, 178 1806- 1807, 178/19.01, 178/19.03
• US Class Current: 345/174
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 1/169 the I/O peripheral being an integrated pointing device, e.g. trackball in the palm rest area, mini-joystick integrated between keyboard keys, touch pads or touch stripes G06F1/1643 takes precedence; constructional details of pointing devices G06F3/033
• 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 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• 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: H10K 59/40 OLEDs integrated with touch screens

Abstract

An electrostatic capacitive coupling type touch panel in which a period before wiring formed outside an input region is chipped or wire-broken due to deterioration of a mask pattern can be prolonged. The touch panel has an input region and plural wirings formed around the input region. The input region has plural X electrodes and plural Y electrodes crossing the X electrodes. The plural wirings are connected to corresponding electrodes of the plural X electrodes and Y electrodes. The plural wirings respectively have a conductive layer and a metal layer formed on the conductive layer. The conductive layer is formed to be wider than the metal layer. The plural wirings have a corner. Among the plural wirings, in the wiring provided in the farthest position from the input region, the corner of the metal layer is chamfered.

Claims

1. An electrostatic capacitive coupling type touch panel having:

an input region; and

a plurality of wirings formed around the input region;

the input region having a plurality of X electrodes and a plurality of Y electrodes crossing the X electrodes;

the plurality of wirings respectively being connected to corresponding electrodes of the plurality of X electrodes and the plurality of Y electrodes;

wherein the plurality of wirings respectively have;

a conductive layer; and

a metal layer formed on the conductive layer;

wherein the conductive layer is formed to have a width greater than that of the metal layer;

wherein the plurality of wirings have a corner; and

wherein, in a wiring provided in a farthest position from the input region, among the plurality of wirings, an outer edge of the corner of the metal layer is chamfered and an outer edge of the corner of the conductive layer is not chamfered.

2. The touch panel according to claim 1, wherein, assuming that a width of a chamfered portion of the metal layer at the corner of the wiring formed in the farthest position from the input region is W1, and a mean value of the widths of the metal layers in linear portions of the wiring formed in the farthest position from the input region is W2,

0.8×

W2≦

W1≦

1.2×

W2 is satisfied.

3. The touch panel according to claim 1, wherein the conductive layer has a transparent conductive film.

4. The touch panel according to claim 1,

wherein the plurality of wirings respectively have an upper conductive layer provided on the metal layer with an insulating film therebetween, and

wherein the upper conductive layer is electrically connected to the conductive layer of the plurality of wirings.

5. The touch panel according to claim 4, wherein the conductive layer and the upper conductive layer have a transparent conductive film.

6. The touch panel according to claim 1, wherein the X electrode and the Y electrode have a transparent conductive film.

7. The touch panel according to claim 1, wherein the X electrode and the Y electrode are formed with an insulating film therebetween.

8. The touch panel according to claim 1,

wherein the X electrode and the Y electrode have an intersection part between the X electrode and the Y electrode and an electrode part formed between two intersection parts,

wherein the electrode part and the intersection part of the X electrode and the electrode part of the Y electrode are formed on the same layer, and

wherein the intersection part of the Y electrode is formed on a different layer, with an insulating layer therebetween.

9. A display device with touch panel wherein the electrostatic capacitive coupling type touch panel in claim 1 is provided on a surface of a display panel on the observer side.

10. A display device with touch panel wherein the electrostatic capacitance type touch panel in claim 1 is provided on a surface of a display panel on the observer side.

11. The touch panel according to claim 1,

wherein, in the wiring provided in the farthest position from the input region, among the plurality of wirings, an inner edge of the corner of the metal layer is not chamfered and an inner edge of the corner of the conductive layer is not chamfered.

12. An electrostatic capacitive coupling type touch panel having:

an input region; and

a plurality of wirings formed around the input region;

the input region having a plurality of X electrodes and a plurality of Y electrodes crossing the X electrodes;

the plural wirings respectively being connected to corresponding electrodes of the plurality of X electrodes and the plurality of Y electrodes;

wherein the plurality of wirings respectively have;

a conductive layer; and

a metal layer formed on the conductive layer;

wherein the conductive layer is formed to have a width greater than that of the metal layer;

wherein the plurality of wirings have a corner;

wherein, in a wiring provided in a farthest position from the input region, among the plurality of wirings, an outer edge of the corner of the metal layer is chamfered and an outer edge of the corner of the conductive layer is not chamfered; and

wherein a dummy wiring, not connected to any of the plurality of X electrodes or the plurality of Y electrodes, is provided outside the wiring formed in a farthest position from the input region, among the plurality of wirings.

13. The touch panel according to claim 12, wherein the dummy wiring is supplied with a reference voltage.

14. The touch panel according to claim 12, wherein the conductive layer has a transparent conductive film.

15. The touch panel according to claim 12,

wherein the plurality of wirings respectively have an upper conductive layer provided on the metal layer with an insulating film therebetween, and

wherein the upper conductive layer is electrically connected to the conductive layer of the plurality of wirings.

16. The touch panel according to claim 15, wherein the conductive layer and the upper conductive layer have a transparent conductive film.

17. The touch panel according to claim 12, wherein the X electrode and the Y electrode have a transparent conductive film.

18. The touch panel according to claim 12, wherein the X electrode and the Y electrode are formed with an insulating film therebetween.

19. The touch panel according to claim 12,

wherein the X electrode and the Y electrode have an intersection part between the X electrode and the Y electrode and an electrode part formed between two intersection parts,

wherein the electrode part and the intersection part of the X electrode and the electrode part of the Y electrode are formed on the same layer, and

wherein the intersection part of the Y electrode is formed on a different layer, with an insulating layer therebetween.

20. The touch panel according to claim 12,

wherein in the wiring provided in the farthest position from the input region, among the plurality of wirings, an inner edge of the corner of the metal layer is not chamfered and an inner edge of the corner of the conductive layer is not chamfered.