Touch panel

• US 9,423,912 B2
• Filed: 01/04/2013
• Issued: 08/23/2016
• Est. Priority Date: 01/04/2012
• Status: Active Grant

• Current Assignee: TPK Holding Co., Ltd.
• Original Assignee: TPK Holding Co., Ltd.
• Inventors: Huang, Shin-Chieh, Chen, Hsuan-Ta, Lien, Chih-Hsien, Chen, Wei-Min, Hsu, Wei-Chih, Lin, Su-Ming, Yu, Peng-Chih, Yin, Hsiang-Wei, Wu, Ming-Kung, Lin, Yu-Ting, Huang, Ping-Wen
• Primary Examiner(s): Haley, Joseph
• Assistant Examiner(s): ILUYOMADE, IFEDAYO B
• Application Number:
  US13/733,909
• Publication Number:
  US 20130169597A1
• Time in Patent Office: 1,327 Days
• Field of Search: None
• US Class Current: 1/1
• 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 having a first surface and a second surface opposite to the first surface, wherein the first surface is a touch surface;

a touch sensing electrode, comprising;

a plurality of first axis sensing electrodes disposed on the second surface of the substrate; and

a plurality of second axis sensing electrodes disposed on the second surface of the substrate;

an optical compensation layer, directly disposed on the second surface of 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;

an adhesive layer disposed on the optical compensation layer; and

a protection layer disposed on the adhesive layer, wherein a refraction index of the adhesive layer is smaller than the refraction index of the optical compensation layer.

2. The touch panel of claim 1, wherein a refraction index of the first axis sensing electrodes and the second axis sensing electrodes 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 a thickness between 18 nanometers and 150 nanometers, and the optical compensation layer comprises a thickness between 60 nanometers and 150 nanometers.

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

5. The touch panel of claim 4, 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.

6. The touch panel of claim 1, wherein the adhesive layer comprises a thermal curing adhesive, an ultraviolet curing adhesive, a liquid optical clear adhesive, or a pressure sensitive adhesive.

7. The touch panel of claim 1, wherein a thickness of the touch sensing electrode is 110 nanometers, and a thickness of the optical compensation layer is 60 nanometers.

8. The touch panel of claim 1, wherein a thickness of the touch sensing electrode is 110 nanometers, and a thickness of the optical compensation layer is 70 nanometers.