TOUCH PANEL

• US 20110316803A1
• Filed: 06/24/2011
• Published: 12/29/2011
• Est. Priority Date: 06/29/2010
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: KIM, Tae-Hwan
• Granted Patent: US 9,158,419 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• 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 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• 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

The present invention relates to a touch panel which can detect touch securely without being affected by drive of an underlying display panel and shield external static electricity, securely, the touch panel includes a substrate having an active region and a peripheral region surrounding the active region; a plurality of first electrodes and second electrodes formed on the active region in a row direction and a column direction, respectively; a plurality of pad electrodes on one side of the peripheral region; routing lines for connecting ends of the first electrodes and the second electrodes to the pad electrodes, respectively; and a transparent conductive layer formed at the peripheral region to cover the routing lines.

Claims

1. A touch panel comprising:

a substrate having an active region and a peripheral region surrounding the active region;

a plurality of first electrodes and second electrodes formed on the active region in a row direction and a column direction, respectively;

a plurality of pad electrodes on one side of the peripheral region;

routing lines for connecting ends of the first electrodes and the second electrodes to the pad electrodes, respectively; and

a transparent conductive layer formed at the peripheral region to cover the routing lines.

2. The touch panel as claimed in claim 1, further comprising a guide ring line formed on an outer region of the routing lines;

wherein the transparent conductive layer is electrically connected to the guide ring line and covers the guide ring line.

3. The touch panel as claimed in claim 2, wherein a minimum width of the transparent conductive layer is equal to a straight-line distance from an inside line of innermost routing line adjacent to the active region to an outer edge line of the guide ring line which is not adjacent to the routing line.

4. The touch panel as claimed in claim 1, wherein the first electrodes and the second electrodes are electrically spaced from the transparent conductive layer.

5. The touch panel as claimed in claim 1, wherein the transparent conductive layer is formed on the same layer with the first electrodes.

6. The touch panel as claimed in claim 2, wherein the transparent conductive layer is formed under the guide ring line.

7. The touch panel as claimed in claim 2, wherein the transparent conductive layer is formed over the guide ring line.

8. The touch panel as claimed in claim 2, wherein the transparent conductive layer includes:

a first conductive film formed under the guide ring line, and

a second conductive film formed over the guide ring line.

9. The touch panel as claimed in claim 8, wherein the first conductive film or the second conductive film is formed on the same layer with the first electrodes.

10. The touch panel as claimed in claim 2, wherein the guide ring line has a ground voltage signal or a DC voltage signal applied thereto.

11. The touch panel as claimed in claim 1, wherein each of the first electrodes includes a plurality of first electrode patterns in a first direction spaced from one another, and first connection patterns each electrically connected between adjacent first electrode patterns, and

each of the second electrodes includes a plurality of second electrode patterns in a second direction perpendicular to the first direction spaced from one another, and second connection patterns each electrically connected between adjacent second electrode patterns,

wherein the second connection patterns and the second electrode patterns are formed in different layers.

12. The touch panel as claimed in claim 11, wherein the second connection patterns are formed on the same layer with the routing lines and the pad electrodes.

13. The touch panel as claimed in claim 12, further comprising connection electrodes electrically connected between ends of the first electrodes and the second electrodes, and the routing lines, respectively.

14. The touch panel as claimed in claim 13, wherein the connection electrodes are formed on the same layer with the routing lines and the pad electrodes.

15. The touch panel as claimed in claim 1, further comprising an insulating film disposed between the routing lines and the transparent conductive layer.

16. The touch panel as claimed in claim 1, wherein a surface of the substrate, on which the first electrodes and the second electrodes are formed, is attached to a surface of the display panel.

17. The touch panel as claimed in claim 1, wherein a first surface of the substrate, on which the first electrodes and the second electrodes are not formed, is attached to a surface of the display panel.

18. The touch panel as claimed in claim 17, further comprising a cover glass attached to a second surface of the substrate, on which the first electrodes and the second electrodes are formed.