Display Panel

• US 20090213090A1
• Filed: 01/14/2009
• Published: 08/27/2009
• Est. Priority Date: 02/27/2008
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Japan Display East Incorporated (Japan Display Incorporated)
• Inventors: Furuhashi, Tsutomu, Sato, Hideo, Mamba, Norio
• Granted Patent: US 8,199,127 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• 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

Abstract

A display panel is provided having a capacitive touch panel over a display region, wherein the capacitive touch panel comprises a plurality of X electrodes and a plurality of Y electrodes formed with an insulating layer there between and in a manner to cross each other, each of the X electrodes and the Y electrodes is formed such that a pad portion and a narrow line portion are alternately placed in a direction of extension, and when viewed from top, the pad portion of the X electrode and the pad portion of the Y electrode are placed to not overlap each other and a dummy electrode which is in a floating relationship with the X electrode and the Y electrode is formed between the pad portion of the X electrode and the pad portion of the Y electrode.

Claims

1. A display panel having a capacitive touch panel over a display region, the capacitive touch panel comprising:

a plurality of X electrodes and a plurality of Y electrodes formed with an insulating layer therebetween and in a manner to cross each other, each of the X electrodes and the Y electrodes being formed to have a pad portion and a narrow line portion alternately placed in a direction of extension, the pad portion of each of the X electrodes and the pad portion of each of the Y electrodes being placed not to overlap each other when viewed from top; and

a dummy electrode which is in a floating relationship with the X electrodes and the Y electrodes, the dummy electrode being formed between the pad portion of each of the X electrodes and the pad portion of each of the Y electrodes.

2. The display panel according to claim 1, wherein

the dummy electrode comprises a plurality of electrodes which are aligned in a direction from the pad portion of each of the X electrodes to the pad portion of each of the Y electrodes.

3. The display panel according to claim 1, wherein

the dummy electrode is formed in a same layer as the X electrodes.

4. The display panel according to claim 1, wherein

the dummy electrode is formed in a same layer as the Y electrodes.

5. The display panel according to claim 2, wherein

the dummy electrode comprises a dummy electrode formed in a same layer as the X electrodes and a dummy electrode formed in a same layer as the Y electrodes.

6. The display panel according to claim 1, wherein

the dummy electrode comprises a dummy electrode in a same layer as the X electrodes and a dummy electrode in a same layer as the Y electrodes, wherein

when viewed from top, the dummy electrode in the same layer as the X electrodes and the dummy electrode in the same layer as the Y electrodes overlap each other.

7. The display panel according to claim 1, wherein

the dummy electrode comprises a dummy electrode placed overlapping the pad portion of each of the Y electrodes formed in a same layer as the X electrodes and a dummy electrode placed overlapping the pad portion of each of the X electrodes formed in a same layer as the Y electrodes.

8. A display panel having a capacitive touch panel over a display region, the capacitive touch panel comprising:

a plurality of X electrodes and a plurality of Y electrodes formed with an insulating layer therebetween and in a manner to cross each other, each of the X electrodes and the Y electrodes being formed to have a pad portion and a narrow line portion alternately placed in a direction of extension, and

a dummy electrode which is in a floating relationship with the X electrodes and the Y electrodes, the dummy electrode being formed in each of regions surrounded by the pad portion of each of the X electrodes and the Y electrodes.

9. The display panel according to claim 8, wherein

when viewed from top, the pad portion of each of the X electrodes and the pad portion of each of the Y electrodes are placed not to overlap each other, further comprising a second dummy electrode which is in a floating relationship the second dummy electrode being formed between the pad portion of each of the X electrodes and the pad portion of each of the Y electrodes.

10. The display panel according to claim 9, wherein

the second dummy electrode between the pad portion of each of the X electrodes and the pad portion of each of the Y electrodes comprises a plurality of electrodes which are aligned in a direction from the pad portion of each of the X electrodes to the pad portion of each of the Y electrodes.

11. The display panel according to claim 9, wherein

the second dummy electrode is formed in a same layer as the X electrodes.

12. The display panel according to claim 9, wherein

the second dummy electrode is formed in a same layer as the Y electrodes.

13. The display panel according to claim 9, wherein

the second dummy electrode comprises a second dummy electrode formed in a same layer as the X electrodes and a second dummy electrode formed in a same layer as the Y electrodes.

14. The display panel according to claim 9, wherein

the second dummy electrode comprises a second dummy electrode in a same layer as the X electrodes and a second dummy electrode in a same layer as the Y electrodes, wherein

when viewed from top, the second dummy electrode in the same layer as the X electrodes and the second dummy electrode in the same layer as the Y electrodes overlap each other.

15. The display panel according to claim 8, wherein

the second dummy electrode comprises a second dummy electrode that is placed overlapping the pad portion of each of the Y electrodes and formed in a same layer as the X electrodes and a second dummy electrode that is placed overlapping the pad portion of each of the X electrodes and formed in a same layer as the Y electrodes.