Touch panel

• US 9,817,496 B2
• Filed: 06/16/2015
• Issued: 11/14/2017
• Est. Priority Date: 06/19/2014
• Status: Active Grant

• Current Assignee: TPK Touch Solutions (Xiamen) Inc. (TPK Holding Co., Ltd.)
• Original Assignee: TPK Touch Solutions (Xiamen) Inc. (TPK Holding Co., Ltd.)
• Inventors: Hsu, I-Chung, Hsu, Kuo-Shu, Lu, Fenghua, Xu, Chenghong
• Primary Examiner(s): Moon, Seokyun
• Application Number:
  US14/741,447
• Publication Number:
  US 20150370357A1
• Time in Patent Office: 882 Days
• Field of Search: None
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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

Abstract

A touch panel comprises a protection substrate, a first transparent substrate, a first patterned electrode layer and a first transparent adhesive layer. The first transparent substrate is disposed opposite the protection substrate. The first patterned electrode layer is disposed on the first transparent substrate and between the protection substrate and the first transparent substrate, and includes a patterned portion and a non-patterned portion. The first transparent adhesive layer is disposed between the protection substrate and the first patterned electrode layer. The refractive index of the first transparent adhesive layer is greater than or equal to 1.65 and less than or equal to 1.72, wherein reflectivity of the patterned portion is substantially the same as the reflectivity of the non-patterned portion.

Claims

1. A touch panel, comprising:

a protection substrate;

a first transparent substrate;

a first patterned electrode layer disposed on the first transparent substrate and between the protection substrate and the first transparent substrate, wherein the first patterned electrode layer comprises a patterned portion and a non-patterned portion; and

a first transparent adhesive layer disposed between the protection substrate and the first patterned electrode layer, wherein;

the first transparent adhesive layer has a first surface and a second surface disposed opposite the first surface,

the first surface faces the protection substrate and the second surface faces the first transparent substrate,

a refractive index of the second surface is greater than a refractive index of the first surface,

a refractive index of the first transparent adhesive layer is greater than or equal to 1.65 and less than or equal to 1.72, and

a reflectivity of the patterned portion and a reflectivity of the non-patterned portion are substantially equal.

2. The touch panel of claim 1, further comprising:

a second patterned electrode layer disposed on a side of the first transparent substrate that faces away from the protection substrate.

3. The touch panel of claim 1, further comprising:

a second patterned electrode layer disposed on the protection substrate and between the protection substrate and the first transparent adhesive layer.

4. The touch panel of claim 1, further comprising:

a refractive-index matching layer disposed between the first patterned electrode layer and the first transparent substrate.

5. The touch panel of claim 4, wherein:

the refractive-index matching layer comprises a first refractive-index matching layer and a second refractive-index matching layer,

the first refractive-index matching layer is disposed between the first transparent substrate and the second refractive-index matching layer and has a refractive index in a range between 2.0 and 2.5, and

the second refractive-index matching layer is disposed between the first patterned electrode layer and the first refractive-index matching layer and has a refractive index in a range between 1.3 and 1.6.

6. The touch panel of claim 2, further comprising:

a refractive-index matching layer disposed between the first patterned electrode layer and the first transparent substrate.

7. The touch panel of claim 6, wherein:

the refractive-index matching layer comprises a first refractive-index matching layer and a second refractive-index matching layer,

the first refractive-index matching layer is disposed between the first transparent substrate and the second refractive-index matching layer and has a refractive index in a range between 2.0 and 2.5, and

the second refractive-index matching layer is disposed between the first patterned electrode layer and the first refractive-index matching layer and has a refractive index in a range between 1.3 and 1.6.

8. The touch panel of claim 3, further comprising:

a refractive-index matching layer disposed between the first patterned electrode layer and the first transparent substrate.

9. The touch panel of claim 8, wherein:

the refractive-index matching layer comprises a first refractive-index matching layer and a second refractive-index matching layer,

the first refractive-index matching layer is disposed between the first transparent substrate and the second refractive-index matching layer and has a refractive index in a range between 2.0 and 2.5, and

the second refractive-index matching layer is disposed between the first patterned electrode layer and the first refractive-index matching layer and has a refractive index in a range between 1.3 and 1.6.

10. The touch panel of claim 1, further comprising:

a second transparent substrate;

a second patterned electrode layer disposed on the second transparent substrate; and

a second transparent adhesive layer disposed between the first transparent substrate and the second patterned electrode layer.

11. The touch panel of claim 10, further comprising:

a refractive-index matching layer disposed between the protection substrate and the first transparent adhesive layer.

19. The touch panel of claim 1, wherein a stickiness of the first surface is greater than a stickiness of the second surface.

12. A touch panel, comprising:

a protection substrate;

a transparent substrate;

a first patterned electrode layer disposed on a side of the transparent substrate that faces away from the protection substrate, wherein the first patterned electrode layer includes a patterned portion and a non-patterned portion; and

a first transparent adhesive layer disposed between the protection substrate and the transparent substrate, wherein;

the first transparent adhesive layer has a first surface and a second surface disposed opposite the first surface,

the first surface faces the protection substrate and the second surface faces the transparent substrate,

a refractive index of the second surface is greater than a refractive index of the first surface,

the refractive index of the first transparent adhesive layer is greater than or equal to 1.65 and less than or equal to 1.72, and

a reflectivity of the patterned portion and a reflectivity of the non-patterned portion are substantially equal.

13. The touch panel of claim 12, wherein the transparent substrate and the first patterned electrode layer are formed on a carrying substrate and then transferred to the protection substrate.

14. The touch panel of claim 12, wherein a thickness of the transparent substrate is in a range between 0.1 μ

m and 15 μ

m.

15. The touch panel of claim 12, further comprising:

a refractive-index matching layer disposed between the transparent substrate and the first patterned electrode layer.

20. The touch panel of claim 12, wherein a stickiness of the first surface is greater than a stickiness of the second surface.

16. A touch panel, comprising:

a protection substrate;

a first transparent substrate;

a first patterned electrode layer disposed on the first transparent substrate and between the protection substrate and the first transparent substrate, wherein the first patterned electrode layer comprises a patterned portion and a non-patterned portion; and

a first transparent adhesive layer disposed between the protection substrate and the first patterned electrode layer,

wherein;

the first transparent adhesive layer has a first surface and a second surface disposed opposite the first surface,

the first surface faces the protection substrate and the second surface faces the first transparent substrate, and

a stickiness of the first surface is greater than a stickiness of the second surface.

17. The touch panel of claim 16, wherein a refractive index of the second surface is greater than a refractive index of the first surface.

18. The touch panel of claim 17, wherein a refractive index of the first transparent adhesive layer is greater than or equal to 1.65 and less than or equal to 1.72.