Touch panel and touch panel manufacturing method

Patent metadata

Field	Value
Publication number	US-12379817-B2
Application number	US-202118704014-A
Country	US
Kind code	B2
Filing date	Dec 29, 2021
Priority date	Dec 29, 2021
Publication date	Aug 5, 2025
Grant date	Aug 5, 2025

Abstract

A touch panel includes: a first metal wire formed on an underlayer; an insulating film formed to cover the first metal wire; and a second metal wire formed on the insulating film. The second metal wire has: a first pattern extending in a first direction; and a plurality of second patterns formed to be insulated from the first pattern. The first metal wire has: a bridge pattern connecting together, in a second direction, a pair of second patterns arranged to sandwich the first pattern; and a dummy pattern formed to be insulated from the bridge pattern, the second direction intersecting with the first direction, and the pair of second patterns being included in the plurality of second patterns.

First claim

The invention claimed is:

1. A touch panel, comprising:
a first metal wire formed on an underlayer;
an insulating film formed to cover the first metal wire; and
a second metal wire formed on the insulating film,
wherein the second metal wire has:
a first pattern extending in a first direction, and
a plurality of second patterns formed to be insulated from the first pattern,

the first metal wire has:
a bridge pattern connecting together, in a second direction, a pair of second patterns arranged to sandwich the first pattern, and
a dummy pattern formed to be insulated from the bridge pattern, the second direction intersecting with the first direction, and the pair of second patterns being included in the plurality of second patterns,

the bridge pattern is formed in a V-shaped mesh pattern as a whole,
each of the first pattern, the second pattern, and the dummy pattern is formed in a mesh pattern, and
the dummy pattern is positioned to overlap with the first pattern and the second pattern as a whole.

2. The touch panel according to claim 1 ,
wherein the dummy pattern is electrically connected to the first pattern and the second pattern, and
a portion of the dummy pattern connected to the first pattern and another portion of the dummy pattern connected to the second pattern are insulated from each other.

3. The touch panel according to claim 1 ,
wherein the first metal wire has a multilayer structure including titanium, aluminum, and titanium.

4. A touch panel manufacturing method, comprising:
forming step of forming a first metal wire having a bridge pattern and a dummy pattern on an underlayer;
covering the bridge pattern with a resist and removing a product produced on the underlayer during the forming of the first metal wire;
delaminating the resist from the bridge pattern;
forming an insulating film that covers the first metal wire;

and
forming step of forming a second metal wire on the insulating film,
wherein the second metal wire has:
a first pattern extending in a first direction, and
a plurality of second patterns formed to be insulated from the first pattern,

the bridge pattern connects together, in a second direction, a pair of second patterns arranged to sandwich the first pattern, the second direction intersecting with the first direction, the pair of second patterns being included in the plurality of second patterns, and
the dummy pattern is insulated from the bridge pattern.

5. The touch panel according to claim 2 ,
wherein the insulating film has a contact hole, and
the dummy pattern is electrically connected to the first pattern and the second pattern through the contact hole.

Assignees

• Sharp Display Technology Corp

Inventors

• Saitoh Takao
• Kanzaki Yohsuke
• Yamanaka Masaki
• Miwa Masahiko
• Sun Yi
• Fujiwara Masaki

Classifications

• G06F2203/04103

  Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices · CPC title

• G06F3/0443

  using a single layer of sensing electrodes · CPC title

• G06F2203/04112

  Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material · CPC title

• G06F2203/04111

  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 title

• G06F3/0446

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title