Coordinate input apparatus and display unit

• US 20060250373A1
• Filed: 03/21/2006
• Published: 11/09/2006
• Est. Priority Date: 03/23/2005
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kaneko, Susumu, Sakurai, Hisao
• Granted Patent: US 8,269,724 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• 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: G06F 3/0447 Position sensing using the local deformation of sensor cells

Abstract

A coordinate input apparatus which can reliably specify a coordinate component (a position coordinate) of a selected position without a complicated structure irrespective of use conditions is provided. A coordinate input apparatus includes a capacity detecting portion which detects capacitance, wherein the coordinate input apparatus specifies a coordinate component of a selected position on the basis of a change in capacitance detected by the capacity detecting portion, and the capacity detecting portion includes a first conductive layer, an insulating layer which is formed on the first conductive layer, and a second conductive layer which is formed on the insulating layer in a mesh shape, and has a predetermined potential difference between the second conductive layer and the first conductive layer.

Claims

1. A coordinate input apparatus, comprising:

a capacitance detecting portion which detects capacitance,

wherein the coordinate input apparatus specifies a coordinate component of a selected position based on a change in capacitance detected by the capacitance detecting portion,

wherein the capacitance detecting portion comprises;

a first conductive layer,

an insulating layer which is formed on the first conductive layer, and

a second conductive layer which is formed on the insulating layer in a mesh shape, and has a predetermined potential difference between the second conductive layer and the first conductive layer.

2. The coordinate input apparatus according to claim 1, wherein:

the capacitance detecting portion further includes four electrodes which are formed at four corners on the first conductive layer, and

the predetermined potential difference is generated by a voltage applied via the four electrodes.

3. The coordinate input apparatus according to claim 1, wherein;

the insulating layer further serves as a substrate of the capacitance detecting portion, and

the first conductive layer is formed on one side of the substrate, and the second conductive layer is formed on another side of the substrate.

4. The coordinate input apparatus according to claim 1, wherein

holes in the mesh shape of the second conductive layer are uniformly disposed in the second conductive layer.

5. The coordinate input apparatus according to claim 1, wherein

sizes of holes in the mesh shape of the second conductive layer gradually increase from an end portion to a central portion in the second conductive layer.

6. The coordinate input apparatus according to claim 1, wherein

widths of lines in the mesh shape of the second conductive layer gradually increase from an end portion to a central portion in the second conductive layer.

7. A display unit, comprising:

a display panel which displays an image;

a coordinate input means being formed on the display panel, and including a capacitance detecting portion which detects capacitance, the coordinate input means for specifying a coordinate component of a selected position based on a change in capacitance detected by the capacitance detecting portion,

wherein the capacitance detecting portion comprises;

a first conductive layer,

an insulating layer which is formed on the first conductive layer, and

a second conductive layer which is formed on the insulating layer in a mesh shape, and has a predetermined potential difference between the second conductive layer and the first conductive layer.

8. A display unit, comprising:

a display panel which displays an image;

a coordinate input section being formed on the display panel, including a capacitance detecting portion which detects capacitance, and specifying a coordinate component of a selected position on the basis of a change in capacitance detected by the capacitance detecting portion,

wherein the detecting portion comprises;

a first conductive layer,

an insulating layer which is formed on the first conductive layer, and

a second conductive layer which is formed on the insulating layer in a mesh shape, and has a predetermined potential difference between the second conductive layer and the first conductive layer.