INPUT DEVICE AND DISPLAY DEVICE INCLUDING THE SAME

• US 20100265212A1
• Filed: 04/16/2010
• Published: 10/21/2010
• Est. Priority Date: 04/21/2009
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Japan Display Incorporated
• Inventors: Nagata, Koji, Sekiguchi, Shinji, Hayakawa, Kouji
• Granted Patent: US 8,537,136 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• 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

Abstract

Provided is an electrostatic capacity type touch panel, which responds to not only an input by a finger but also a touch by a nonconductive input member. Disposed are X electrodes XP and Y electrodes YP that cross each other via a first insulating layer 2, and a Z electrode formed of a transparent elastic conductive resin layer 4 via a second insulating layer 3. The transparent elastic conductive resin layer 4 is a high polymer elastic resin layer in which conductive fine particles are dispersed, and is made of a material in which density of the conductive fine particles is increased by pressure of a touch.

Claims

1. An electrostatic capacity type touch panel, comprising:

a first transparent substrate;

a plurality of X electrodes, a plurality of Y electrodes, and a Z electrode, which are disposed on the first transparent substrate;

a first insulating layer disposed between the plurality of X electrodes and the plurality of Y electrodes that cross each other;

a second insulating layer disposed between the Z electrode and the plurality of X electrodes as well as the plurality of Y electrodes; and

a second transparent substrate disposed on a touched side,

wherein the Z electrode is formed so as to overlap the plurality of X electrodes and the plurality of Y electrodes in a plan view and is compressed by a pressure of a touch operation so that a resistance value of the Z electrode is decreased, to thereby generate a capacity between the plurality of X electrodes and the plurality of Y electrodes so that coordinates of a touched position are detected.

2. The electrostatic capacity type touch panel according to claim 1, wherein the Z electrode is electrically floating and comprises a member formed of a transparent high polymer elastic resin layer in which conductive fine particles are dispersed.

3. The electrostatic capacity type touch panel according to claim 2, wherein each of the conductive fine particles contained in the Z electrode has an average grain diameter in a range of from 0.01 to 5 μ

m.

4. The electrostatic capacity type touch panel according to claim 3, wherein the Z electrode has a thickness in a range of from 0.5 to 200 μ

m.

5. The electrostatic capacity type touch panel according to claim 4, wherein the second transparent substrate has a thickness in a range of from 100 to 800 μ

m.

6. A display device, comprising:

a display portion; and

the electrostatic capacity type touch panel according to claim 1 disposed on a front side of the display portion.

7. An electrostatic capacity type touch panel, comprising:

a first substrate including a plurality of X electrodes and a plurality of Y electrodes;

an insulating layer disposed on the plurality of X electrodes and the plurality of Y electrodes; and

an elastic layer comprises an elastic member and a plurality of conductive members overlapping via the elastic member in a direction perpendicular to a surface of the first substrate, the elastic layer being disposed over the insulating layer.

8. The electrostatic capacity type touch panel according to claim 7, further comprising a second substrate which is disposed on the elastic layer and has stiffness higher than stiffness of the elastic layer.

9. The electrostatic capacity type touch panel according to claim 7, wherein the plurality of conductive members comprise conductive particles.

10. An electrostatic capacity type touch panel, comprising:

a first substrate including a plurality of X electrodes and a plurality of Y electrodes;

an insulating layer disposed on the plurality of X electrodes and the plurality of Y electrodes;

an elastic layer which is disposed over the insulating layer and has a plurality of conductive particles dispersed thereinside; and

a second substrate which is disposed on the elastic layer and has stiffness higher than stiffness of the elastic layer.