TOUCH PANEL

• US 20150370357A1
• Filed: 06/16/2015
• Published: 12/24/2015
• 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
• Granted Patent: US 9,817,496 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 disposed opposite the protection substrate;

a first patterned electrode layer disposed on the first transparent substrate and between the protection substrate and the first transparent substrate, and including 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 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 reflectivity of the non-patterned portion.

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

a second patterned electrode layer disposed on the side of the first transparent substrate 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 includes 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 includes 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 includes 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 between the first transparent substrate and the second transparent adhesive layer; 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.

12. The touch panel of claim 1, wherein the first transparent substrate includes a glass substrate, a plastic substrate, a sapphire substrate, or a polyester thin film.

13. The touch panel of claim 1, wherein the first transparent adhesive layer has a first surface and a second surface which are disposed oppositely, the first surface faces the protection substrate and the second surface faces the, first transparent substrate, the refractive index of the second surface is greater than that of the first surface, and the stickiness of the first surface is greater than that of the second surface.

14. The touch panel of claim 13, wherein the thickness of the first transparent adhesive layer is in a range between 150 μ

m and 200 μ

m.

15. A touch panel, comprising:

a protection substrate;

a transparent substrate disposed opposite the protection substrate;

a first patterned electrode layer disposed on the side of the transparent substrate away from the protection substrate and including 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 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 reflectivity of the and non-patterned portion.

16. The touch panel as recited in claim 15, wherein the first transparent adhesive layer has a first surface and a second surface which are disposed oppositely, the first surface faces the protection substrate and the second surface faces the transparent substrate, the refractive index of the second surface is greater than that of the first surface, and the stickiness of the first surface, is greater than that of the second surface.

17. The touch panel of claim 15, wherein the transparent substrate and the first patterned electrode layer are formed on a carrying substrate and then transferred to the protection substrate.

18. The touch panel of claim 15, wherein the thickness of the transparent substrate is in a range between 0.1 μ

m and 15 μ

m.

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

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