Touch panel

Patent metadata

Field	Value
Publication number	US-9575608-B2
Application number	US-201514661118-A
Country	US
Kind code	B2
Filing date	Mar 18, 2015
Priority date	Sep 20, 2012
Publication date	Feb 21, 2017
Grant date	Feb 21, 2017

Abstract

A touch panel that includes a dielectric film and a piezoelectric film. A first capacitance detection electrode is disposed on an upper main surface of the dielectric film, a second capacitance detection electrode and a first piezoelectric voltage detection electrode are disposed between a lower main surface of the dielectric film and an upper main surface of the piezoelectric film, and a second piezoelectric voltage detection electrode is disposed on a lower main surface of the piezoelectric film. The first capacitance detection electrode includes plural sub-electrodes extending in a first direction, the second capacitance detection electrode includes plural sub-electrodes extending in a second direction orthogonal to the first direction, and the first piezoelectric voltage detection electrode includes plural sub-electrodes disposed between the plural sub-electrodes.

First claim

The invention claimed is:

1. A touch panel comprising:
a dielectric film having a first main surface and a second main surface, which are opposite to each other;
a piezoelectric film having a third main surface and a fourth main surface, which are opposite to each other, the piezoelectric film being superimposed on the dielectric film with the third main surface and the second main surface being opposite to each other;
a first capacitance detection electrode disposed on the first main surface;
a second capacitance detection electrode disposed between the second main surface and the third main surface, the second capacitance detection electrode being paired with the first capacitance detection electrode;
a first piezoelectric voltage detection electrode disposed between the second main surface and the third main surface; and
a second piezoelectric voltage detection electrode disposed on the fourth main surface, the second piezoelectric voltage detection electrode being paired with the first piezoelectric voltage detection electrode, wherein
the first capacitance detection electrode includes plural first capacitance detection sub-electrodes that extend in a first direction and are disposed with a space therebetween,
the second capacitance detection electrode includes plural second capacitance detection sub-electrodes that extend in a second direction orthogonal to the first direction and are disposed with a space therebetween,
the first piezoelectric voltage detection electrode includes plural first piezoelectric voltage detection sub-electrodes that extend in the second direction and are disposed alternately between the plural second capacitance detection sub-electrodes, and
the second piezoelectric voltage detection electrode has a shape opposing the first piezoelectric voltage detection electrode via the piezoelectric film.

2. The touch panel according to claim 1 , wherein the first capacitance detection sub-electrode and the second capacitance detection sub-electrode both have a shape including plural wide parts and plural narrow parts, which continuously alternate, the narrow parts of the first capacitance detection sub-electrode and the narrow parts of the second capacitance detection sub-electrode opposing each other via the dielectric film.

3. The touch panel according to claim 2 , wherein a portion of the first piezoelectric voltage detection sub-electrode is located in a first region narrower than a second region of the wide part of the first capacitance detection sub-electrode, the portion opposing the wide part of the first capacitance detection sub-electrode.

4. The touch panel according to claim 3 , wherein the first piezoelectric voltage detection sub-electrode has a shape including plural wide parts and plural narrow parts, which continuously alternate, and the wide parts of the first piezoelectric voltage detection sub-electrode are located between the narrow parts of the adjacent second capacitance detection sub-electrodes, whereby the wide parts of the first capacitance detection sub-electrode and the wide parts of the first piezoelectric voltage detection sub-electrode oppose each other via the dielectric film.

5. The touch panel according to claim 4 , wherein the wide parts of the first piezoelectric voltage detection sub-electrode include a portion containing no electrode.

6. The touch panel according to claim 5 , wherein the wide parts have a parallelogram shape, and the narrow parts have a shape that connects corners of the plural parallelogram-shaped wide parts in a direction of a diagonal, in each of the first capacitance detection sub-electrode, the second capacitance detection sub-electrode, and the first piezoelectric voltage detection sub-electrode.

7. The touch panel according to claim 4 , wherein the wide parts have a parallelogram shape, and the narrow parts have a shape that connects corners of the plural parallelogram-shaped wide parts in a direction of a diagonal, in each of the first capacitance detection sub-electrode, the second capacitance detection sub-electrode, and the first piezoelectric voltage detection sub-electrode.

8. The touch panel according to claim 2 , wherein the first piezoelectric voltage detection sub-electrode has a shape including plural wide parts and plural narrow parts, which continuously alternate, and the wide parts of the first piezoelectric voltage detection sub-electrode are located between the narrow parts of the adjacent second capacitance detection sub-electrodes, whereby the wide parts of the first capacitance detection sub-electrode and the wide parts of the first piezoelectric voltage detection sub-electrode oppose each other via the dielectric film.

9. The touch panel according to claim 1 , wherein the second piezoelectric voltage detection electrode is composed of one electrode opposing all of the plural first piezoelectric voltage detection sub-electrodes.

10. The touch panel according to claim 1 , wherein the second piezoelectric voltage detection electrode is composed of plural divided second piezoelectric voltage detection sub-electrodes.

11. The touch panel according to claim 1 , wherein the piezoelectric film is a polylactic acid film.

Assignees

• Murata Manufacturing Co

Inventors

• Ando Masamichi
• Inoue Takafumi

Classifications

• G01B2210/58

  Wireless transmission of information between a sensor or probe and a control or evaluation unit · CPC title

• G06F2203/04105

  Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position · CPC title

• G06F3/044 Primary

  by capacitive means · CPC title

• G01B7/003

  for measuring position, not involving coordinate determination (coordinate measuring G01B7/004) · 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