TOUCH PANEL

• US 20130169597A1
• Filed: 01/04/2013
• Published: 07/04/2013
• Est. Priority Date: 01/04/2012
• Status: Active Grant

• Current Assignee: TPK Holding Co., Ltd.
• Original Assignee: Wintek China Technology Ltd., Wintek Corporation
• Inventors: Yin, Hsiang-Wei, Wu, Ming-Kung, Huang, Shin-Chieh, Lin, Yu-Ting, Lien, Chih-Hsien, Hsu, Wei-Chih, Lin, Su-Ming, Yu, Peng-Chih, Huang, Ping-Wen, Chen, Hsuan-Ta, Chen, Wei-Min
• Granted Patent: US 9,423,912 B2
• Time in Patent Office: Days
• US Class Current: 345/175
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• 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 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/042 by opto-electronic 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

A touch panel includes a substrate, a touch sensing electrode, and an optical compensation layer. The touch sensing electrode is disposed on the substrate. The optical compensation layer is disposed on the substrate and covers the touch sensing electrode. A refraction index of the optical compensation layer is smaller than or equal to a refraction index of the touch sensing electrode.

Claims

1. A touch panel, comprising:

a substrate;

a touch sensing electrode, disposed on the substrate; and

an optical compensation layer, disposed on the substrate and covering the touch sensing electrode,

wherein a refraction index of the optical compensation layer is smaller than or equal to a refraction index of the touch sensing electrode.

2. The touch panel of claim 1, wherein the touch sensing electrode comprises at least one first axis sensing electrode and at least one second axis sensing electrode disposed on one identical surface of the substrate, a refraction index of the first axis sensing electrode and the second axis sensing electrode is between 1.7 and 2.0, and the refraction index of the optical compensation layer is between 1.6 and 1.7.

3. The touch panel of claim 1, wherein the touch sensing electrode comprises at least one first axis sensing electrode and at least one second axis sensing electrode respectively disposed on two opposite surfaces of the substrate, the optical compensation layer comprises a first optical compensation layer and a second optical compensation layer respectively covering the first axis sensing electrode and the second axis sensing electrode, a refraction index of the first axis sensing electrode and the second axis sensing electrode is between 1.7 and 2.0, and a refraction index of the first optical compensation layer and the second optical compensation layer is between 1.6 and 1.7.

4. The touch panel of claim 1, wherein the touch sensing electrode comprises a thickness between 18 nanometers and 150 nanometers, and the optical compensation layer comprises a thickness between 60 nanometers and 150 nanometers.

5. The touch panel of claim 1, wherein the substrate includes a cover lens or a cover glass.

6. The touch panel of claim 5, further comprising a decoration layer, disposed on an edge of the substrate, wherein the decoration layer comprises ceramic material, diamond like carbon material, color ink, photo resist, or resin.

7. The touch panel of claim 1, further comprising an adhesive layer and a covering substrate, wherein the adhesive layer is disposed on the optical compensation layer, the covering substrate is disposed on the adhesive layer, and a refraction index of the adhesive layer is smaller than the refraction index of the optical compensation layer.

8. The touch panel of claim 3, further comprising two adhesive layers, a covering substrate, and a protection layer, wherein the two adhesive layers are respectively disposed on the first optical compensation layer and the second optical compensation layer, and a refraction index of the adhesive layers is smaller than the refraction index of the optical compensation layer.

9. The touch panel of claim 6, further comprising an adhesive layer and a protection layer, wherein the adhesive layer is disposed on the optical compensation layer, the protection layer is disposed on the adhesive layer, and a refraction index of the adhesive layer is smaller than the refraction index of the optical compensation.

10. The touch panel of claim 7, wherein the adhesive layer comprises a thermal curing adhesive, an ultraviolet (UV) curing adhesive, a liquid optical clear adhesive (OCA), or a pressure sensitive adhesive (PSA).

11. The touch panel of claim 8, wherein the adhesive layers comprise thermal curing adhesives, ultraviolet curing adhesives, liquid optical clear adhesives, or pressure sensitive adhesives.

12. The touch panel of claim 9, wherein the adhesive layer comprises a thermal curing adhesive, an ultraviolet curing adhesive, a liquid optical clear adhesive, or a pressure sensitive adhesive.