Touch panel and touch panel-equipped display device

Patent metadata

Field	Value
Publication number	US-9658708-B2
Application number	US-201314408377-A
Country	US
Kind code	B2
Filing date	Jun 28, 2013
Priority date	Jul 2, 2012
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

An arrangement of a cover-integrated touch panel is provided that ensures that sensor electrodes are properly connected with wiring lines. The touch panel includes: a transparent substrate; a light-shielding film on a portion of the substrate; a planarizing film over the substrate and the light-shielding film; a barrier film over the planarizing film; a sensor electrode on the barrier film; a terminal in a region that overlaps the light-shielding film; and a wiring line to electrically connect the sensor electrode with the terminal. The barrier film includes a first inorganic film adjacent to the planarizing film and a second inorganic film on the first inorganic film with a smaller refractive index than the first inorganic film.

First claim

The invention claimed is:

1. A touch panel comprising:
a transparent substrate including, on one surface thereof, a covered portion that is covered by a light-shielding film which blocks light and an uncovered portion that is not covered by a light-shielding film;
a planarizing film directly contacting the substrate in both of the covered portion and the uncovered portion of the substrate;
a barrier film on the planarizing film;
a sensor electrode on and directly contacting the barrier film in a region that overlaps the uncovered portion of the substrate in a plan view;
a terminal in a layer that is more distant from the substrate than the planarizing film and in a region that overlaps the covered portion of the substrate in the plan view; and
a wiring line in a layer that is more distant from the substrate than the planarizing film to electrically connect the sensor electrode with the terminal and in a region that overlaps the covered portion of the substrate,
wherein the barrier film is between the planarizing film and the sensor electrode, and includes:
a first inorganic film adjacent to the planarizing film; and
a second inorganic film on the first inorganic film having a smaller refractive index than the first inorganic film.

2. The touch panel according to claim 1 , wherein:
the first inorganic film has a refractive index of 1.72 to 1.98, and
the second inorganic film has a refractive index of 1.41 to 1.68.

3. The touch panel according to claim 2 , wherein:
the first inorganic film has a thickness of 3 nm to 12 nm, and
the second inorganic film has a thickness of 30 nm to 160 nm.

4. The touch panel according to claim 1 , wherein the first inorganic film includes a silicon nitride film.

5. The touch panel according to claim 1 , wherein the second inorganic film includes one of silicon oxide and silicon oxynitride.

6. The touch panel according to claim 1 , wherein the terminal is located on the barrier film.

7. A touch panel-equipped display device, comprising:
a liquid crystal display device; and
the touch panel according to claim 1 .

8. The touch panel according to claim 1 , wherein
the barrier film covers an entire surface of the planarizing film, and
the terminal is on the barrier film.

Assignees

• Sharp Kk

Inventors

• Misaki Katsunori

Classifications

• G06F3/044

  by capacitive means · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · 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

• G02F1/13338

  Input devices, e.g. touch panels · CPC title

• G06F2203/04107

  Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds · CPC title