Touch panel, display device and touch panel manufacturing method

1. A touch panel, comprising: an insulating substrate; a transparent touch electrode provided on the insulating substrate; and a conductive portion connected to a periphery of the touch electrode, for detecting a touched position on the touch electrode based on an electric signal through the conductive portion, wherein the conductive portion is provided between the insulating substrate and the touch electrode.

2. The touch panel according to claim 1 , wherein the conductive portion is a frame portion provided along the periphery of the touch electrode, and a wiring portion connected to the touch electrode through the frame portion is connected to the frame portion.

3. The touch panel according to claim 2 , wherein the frame portion and the wiring portion are formed by a same material.

4. The touch panel according to claim 2 , wherein the frame portion has a rectangular frame shape, and four wiring portions are provided so as to be respectively connected to four corners of the frame portion.

5. The touch panel according to claim 2 , wherein the frame portion and the wiring portion are formed by an alloy film containing silver and palladium or an alloy film containing silver, palladium, and copper.

6. The touch panel according to claim 5 , wherein the insulating substrate is a glass substrate, and an interlayer film for improving an adhesion property between the insulating substrate and the frame portion and wiring portion is provided between the insulating substrate and the frame portion and wiring portion.

7. The touch panel according to claim 5 , wherein the interlayer film is provided only in a region overlapping the frame portion and the wiring portion.

8. The touch panel according to claim 5 , wherein the touch electrode is extended so as to cover the frame portion and the wiring portion.

9. The touch panel according to claim 8 , wherein the touch electrode is extended at an end of the wiring portion, and a terminal portion of the wiring portion is formed by the extended portion of the touch electrode at the end of the wiring portion.

10. The touch panel according to claim 5 , wherein the touch electrode is formed by a compound of indium oxide and tin oxide.

11. A display device, comprising: the touch panel according to claim 1 ; and a display panel provided so as to face the touch panel.