TRANSPARENT COMPOSITE SUBSTRATE, PREPARATION METHOD THEREOF AND TOUCH PANEL

• US 20160109982A1
• Filed: 10/20/2015
• Published: 04/21/2016
• Est. Priority Date: 10/21/2014
• 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: Lee, Yuh-Wen, Hsia, Hsiang-Lung, Dai, Quanfen, Ye, Dongmei
• Granted Patent: US 9,990,094 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B32B 17/06 comprising glass as the main or only constituent of a layer, next to another layer of a specific material
• CPC Class Codes: B32B 2255/20 Inorganic coating
• CPC Class Codes: B32B 2307/412 Transparent
• CPC Class Codes: B32B 2457/208 Touch screens
• CPC Class Codes: B32B 37/06 characterised by the heating method
• CPC Class Codes: B32B 37/14 characterised by the properties of the layers
• CPC Class Codes: B32B 7/10 at least one layer having inter-reactive properties
• CPC Class Codes: B32B 9/005 comprising one layer of ceramic material, e.g. porcelain, ceramic tile layered products with at least two ceramic layers composed mainly of ceramic B32B18/00
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer

Abstract

A transparent composite substrate includes a first transparent substrate, a second transparent substrate, and a binding layer bonding the first transparent substrate and the second transparent substrate with a bond therebetween.

Claims

1. A transparent composite substrate, comprising:

a first transparent substrate;

a second transparent substrate; and

a binding layer bonding the first transparent substrate and the second transparent substrate with a bond therebetween.

2. The transparent composite substrate of claim 1, wherein the binding layer comprises silicon-oxygen-silicon bonds, aluminum-oxygen-silicon bonds or aluminum-oxygen-aluminum bonds.

3. The transparent composite substrate of claim 1, wherein the first transparent substrate and the second transparent substrate are independently selected from a glass substrate or a sapphire substrate.

4. The transparent composite substrate of claim 3, wherein the first transparent substrate is the sapphire substrate, and the second transparent substrate is the glass substrate.

5. The transparent composite substrate of claim 4, further comprising an inorganic material layer disposed between the binding layer and the sapphire substrate, and the binding layer has silicon-oxygen-silicon bonds.

6. The transparent composite substrate of claim 5, wherein the inorganic material layer is a silicon layer or a silicon dioxide layer.

7. The transparent composite substrate of claim 5, wherein the inorganic material layer has a thickness in a range from about 1 um to about 10 um.

8. The transparent composite substrate of claim 4, wherein the sapphire substrate has a thickness in a range from about 0.1 mm to about 0.3 mm, and the glass substrate has a thickness in a range from about 0.2 mm to about 1 mm.

9. A method of manufacturing a transparent composite substrate, comprising:

providing a first transparent substrate and a second transparent substrate;

activating surfaces of the first transparent substrate and the second transparent substrate to adsorb a hydroxyl group on the surfaces;

overlapping the activated surfaces of the first transparent substrate and the second transparent substrate to form a contact surface therebetween; and

annealing the first transparent substrate and the second transparent substrate to form a binding layer at the contact surface.

10. The method of manufacturing the transparent composite substrate in claim 9, wherein the surfaces of the first transparent substrate and the second transparent substrate are activated by a plasma gas comprising nitrogen gas, argon gas, neon gas, or combination thereof.

11. The method of manufacturing the transparent composite substrate in claim 9, wherein the first transparent substrate and the second transparent substrate are annealed between 0°

C. and 1000°

C.

12. A method of manufacturing a transparent composite substrate, comprising:

providing a sapphire substrate and a glass substrate;

forming an inorganic material layer at a bottom surface of the sapphire substrate;

stacking the sapphire substrate and the glass substrate to form a contact surface between the inorganic material layer and the glass substrate;

applying an electrical field to the sapphire substrate and the glass substrate, the sapphire substrate connecting to an anode of the electrical field, and the glass substrate connecting to a cathode of the electrical field; and

heating the sapphire substrate and the glass substrate to form a binding layer at the contact surface.

13. The method of manufacturing the transparent composite substrate in claim 12, wherein the inorganic material layer is a silicon layer or a silicon dioxide layer.

14. The method of manufacturing the transparent composite substrate in claim 12, wherein the electrical field has a voltage in a range from about 300 V to about 800 V, and a heating temperature is in a range from about 200°

C. to about 400°

C.

15. A touch panel, comprising:

a transparent composite substrate as a cover plate of the touch panel, the transparent composite substrate comprising;

a first transparent substrate;

a second transparent substrate; and

a binding layer bonding the first transparent substrate and the second transparent substrate with a bond therebetween; and

a touch sensing device disposed at the second transparent substrate, the touch sensing device and the binding layer being at two opposite sides of the second transparent substrate respectively.

16. The touch panel of claim 15, wherein the first transparent substrate is a sapphire substrate, and the second transparent substrate is a glass substrate.

17. The touch panel of claim 16, further comprising an anti-reflective film disposed at the first transparent substrate, the anti-reflective film and the binding layer being at two opposite sides of the first transparent substrate respectively.