Method of fabricating capacitive touch panel

• US 9,012,130 B2
• Filed: 06/20/2014
• Issued: 04/21/2015
• Est. Priority Date: 04/13/2009
• Status: Active Grant

• Current Assignee: Innocom Technology Limited, InnoLux Corporation
• Original Assignee: Innocom Technology Limited, InnoLux Corporation
• Inventors: Li, Chao-Sung, Lee, Lien-Hsin, Meng, Kai
• Primary Examiner(s): CHACKO DAVIS, DABORAH
• Application Number:
  US14/310,584
• Publication Number:
  US 20140298643A1
• Time in Patent Office: 305 Days
• Field of Search: 430/319, 430/320, 216/17
• US Class Current: 430/319
• CPC Class Codes: G02F 1/133 Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements arrangements or circuits for control of liquid crystal elements in a matrix, not structurally associated with these elements G09G3/36
• CPC Class Codes: G03F 7/20 Exposure; Apparatus therefor photographic printing apparatus for making copies G03B27/00
• CPC Class Codes: G03F 7/40 Treatment after imagewise removal, e.g. baking
• 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 3/0443 using a single layer of sensing electrodes
• 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
• 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
• CPC Class Codes: Y10T 29/49016 Antenna or wave energy "plumbing" making
• CPC Class Codes: Y10T 29/49105 Switch making

Abstract

The present disclosure relates to a method of fabricating a capacitive touch pane where a plurality of groups of first conductive patterns are formed along a first direction, a plurality of groups of second conductive patterns are formed along a second direction, and a plurality of connection components are formed on a substrate. Each first conductive pattern is electrically connected to another adjacent first conductive pattern in the same group by each connection component and each group of the second conductive patterns is interlaced with and insulated from each group of the first conductive patterns. Next, a plurality of curved insulation mounds are formed to cover the first connection components. Then, a plurality of bridge components are formed to electrically connect each second conductive pattern with another adjacent second conductive pattern in the same group.

Claims

1. A method of fabricating a touch panel, comprising:

providing a substrate;

forming a plurality of bridge components on the substrate;

forming a plurality of insulation mounds on the substrate, wherein each insulation mound covers each bridge component and exposes a portion of each bridge component; and

forming a plurality of groups of first conductive patterns arrange in a first direction, a plurality of groups of second conductive patterns arranged in a second direction, and a plurality of connection components on the substrate, wherein each first conductive pattern is electrically connected to another adjacent first conductive pattern in the same group by each connection component, each group of the second conductive patterns is interlaced with and insulated from each group of the first conductive pattern, and each second conductive pattern is electrically connected to another adjacent second conductive pattern in the same group by each bridge component below each insulation mound.

2. The method of claim 1, wherein the first conductive patterns and the connection components in the same group are formed simultaneously.

3. The method of claim 1, wherein the step of forming the insulation mounds comprises:

forming a photoresist layer;

performing a lithography process on the photoresist layer to form a plurality of photoresist patterns, wherein each photoresist pattern covers each bridge component; and

performing a baking process to make each photoresist pattern become each insulation mound.

4. The method of claim 3, wherein the temperature of the baking process is between 200 to 300 degrees Celsius.

5. The method of claim 1, wherein the step of forming the insulation mounds comprises:

forming an insulation layer on the substrate;

etching the insulation layer to form a plurality of insulation patterns, wherein each insulation pattern covers each bridge component; and

providing a thermal reflow process to make each insulation pattern become each insulation mound.

6. The method of claim 1, wherein the first conductive patterns, the second conductive patterns, and the connection components comprise transparent conductive material.

7. The method of claim 1, wherein the bridge component includes metal or transparent conductive material.

8. The method of claim 1, further comprising forming a plurality of wires on the edge of the substrate, wherein one side of each wire connects to one group of the first conductive patterns or one group of the second conductive patterns and the other side of each wire stretches to the edge of the substrate.

9. The method of claim 8, wherein the step of forming the wires further comprises forming at least an alignment mark on the edge of the substrate.

10. The method of claim 1, wherein an angle is between the first direction and the second direction.