Touch screen, touch panel, and display device including the same

• US 8,913,025 B2
• Filed: 01/31/2013
• Issued: 12/16/2014
• Est. Priority Date: 02/01/2012
• Status: Active Grant

• Current Assignee: Trivale Technologies, LLC (Vector Capital Corporation)
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Imamura, Takuji, Nakamura, Tatsuya, Mori, Seiichiro, Miyayama, Takashi, Agari, Masafumi, Nakagawa, Naoki, Ono, Takeshi
• Primary Examiner(s): Sasinowski, Andrew
• Application Number:
  US13/756,388
• Publication Number:
  US 20130194232A1
• Time in Patent Office: 684 Days
• Field of Search: 345/168, 345173-176, 178/18, 178/19
• US Class Current: 345/173
• CPC Class Codes: G06F 2203/04111 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 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 3/0448 Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality

Abstract

In a touch screen, the number of dummy column block region patterns is made smaller than the number of plurality of detection block region patterns. The plurality of detection block region pattern are obtained as a result of dividing a crossing region where a column direction wire bunch and a row direction wire bunch cross each other. The dummy column block region patterns are obtained as a result of dividing a crossing region where a dummy column direction wire bunch and a row direction wire bunch cross each other.

Claims

1. A touch screen comprising:

a transparent substrate;

a column direction wire bunch and a row direction wire bunch that are formed on said transparent substrate, said column direction wire bunch having a rectangular shape and including a plurality of detection column wires electrically connected commonly to each other, said row direction wire bunch having a rectangular shape and including a plurality of detection row wires electrically connected commonly to each other; and

a dummy column direction wire bunch and a dummy row direction wire bunch, said dummy column direction wire bunch having a rectangular shape and including a plurality of dummy column wires electrically connected commonly to each other, said dummy row direction wire bunch having a rectangular shape and including a plurality of dummy row wires electrically connected commonly to each other, wherein

said dummy column direction wire bunch is provided at the outer side of the outermost one of the detection column wires in a detection region including a plurality of said detection column wires and a plurality of said detection row wires,

said dummy row direction wire bunch is provided at the outer side of the outermost one of the detection row wires in a detection region including a plurality of said detection column wires and a plurality of said detection row wires,

in a plan view, a plurality of detection block regions obtained as a result of dividing a crossing region where said column direction wire bunch and said row direction wire bunch cross each other are specified,

in a plan view, a plurality of dummy column block regions obtained as a result of dividing a crossing region where said dummy column direction wire bunch and said row direction wire bunch cross each other are specified,

in a plan view, a plurality of dummy row block regions obtained as a result of dividing a crossing region where said dummy row direction wire bunch and said column direction wire bunch cross each other are specified,

in a plan view, a plurality of patterns constituting said detection block regions, said dummy column block regions, and said dummy row block regions are specified,

the number of said patterns in said dummy column block region or the number of said patterns in said dummy row block region is smaller than the number of said patterns in said detection block region.

2. A touch panel comprising:

the touch screen according to claim 1;

a switch circuit that sequentially selects each of a plurality of said column direction wire bunches and each of a plurality of said row direction wire bunches; and

a detection processing circuit that performs a calculation process for calculating touch coordinates on said touch screen indicating a touch position touched with an indicator based on a result of detection of an electrostatic capacitance formed between said column direction wire bunch selected by said switch circuit and said indicator having touched said touch screen and a result of detection of an electrostatic capacitance formed between said row direction wire bunch selected by said switch circuit and said indicator.

3. A display device comprising:

the touch panel according to claim 2; and

a display panel mounted to said touch screen of said touch panel.

4. The display device according to claim 3, wherein

said touch screen is adhesively fixed to a front surface side of said display panel.

5. The display device according to claim 3, wherein

said column direction of said touch screen is parallel to a column direction of a pixel pattern in said display panel,

said row direction of said touch screen is parallel to a row direction of said pixel pattern in said display panel.

6. A touch panel comprising:

the touch screen according to claim 1;

a switch circuit that sequentially selects each of a plurality of said column direction wire bunches and each of a plurality of said row direction wire bunches; and

a detection processing circuit that performs a calculation process for calculating touch coordinates on said touch screen indicating a touch position touched with an indicator based on a result of detection of a change in a mutual capacitance between said column direction wire bunch and said row direction wire bunch selected by said switch circuit in accordance with the touch to said touch screen with said indicator.

7. A display device comprising:

the touch panel according to claim 6; and

a display panel mounted to said touch screen of said touch panel.

8. A touch screen comprising:

a transparent substrate;

a column direction wire bunch and a row direction wire bunch that are formed on said transparent substrate, said column direction wire bunch having a rectangular shape and including a plurality of detection column wires electrically connected commonly to each other, said row direction wire bunch having a rectangular shape and including a plurality of detection row wires electrically connected commonly to each other;

a first floating wire formed in the same wire layer as said row direction wire bunch, said first floating wire being not connected to said column direction wire bunch and said row direction wire bunch;

a second floating wire formed in the same wire layer as said column direction wire bunch, said second floating wire being not connected to said column direction wire bunch and said row direction wire bunch; and

a dummy column direction wire bunch and a dummy row direction wire bunch, said dummy column direction wire bunch having a rectangular shape and including a plurality of dummy column wires electrically connected commonly to each other, said dummy row direction wire bunch having a rectangular shape and including a plurality of dummy row wires electrically connected commonly to each other,

said dummy column direction wire bunch is provided at the outer side of the outermost one of the detection column wires in a detection region including a plurality of said detection column wires and a plurality of said detection row wires,

said dummy row direction wire bunch is provided at the outer side of the outermost one of the detection row wires in a detection region including a plurality of said detection column wires and a plurality of said detection row wires,

in a plan view, a plurality of detection block regions obtained as a result of dividing a crossing region where said column direction wire bunch and said row direction wire bunch cross each other are specified,

in a plan view, a plurality of dummy column block regions obtained as a result of dividing a crossing region where said dummy column direction wire bunch and said row direction wire bunch cross each other are specified,

in a plan view, a plurality of dummy row block regions obtained as a result of dividing a crossing region where said dummy row direction wire bunch and said column direction wire bunch cross each other are specified,

in each of said detection block regions, said detection column wire and said first floating wire, or said detection row wire and said second floating wire, are provided,

in said dummy column block region or said dummy row block region, any floating wire that is not electrically connected is not provided.

9. A touch panel comprising:

the touch screen according to claim 8;

a switch circuit that sequentially selects each of a plurality of said column direction wire bunches and each of a plurality of said row direction wire bunches; and

a detection processing circuit that performs a calculation process for calculating touch coordinates on said touch screen indicating a touch position touched with an indicator based on a result of detection of an electrostatic capacitance formed between said column direction wire bunch selected by said switch circuit and said indicator having touched said touch screen and a result of detection of an electrostatic capacitance formed between said row direction wire bunch selected by said switch circuit and said indicator.

10. A display device comprising:

the touch panel according to claim 9; and

a display panel mounted to said touch screen of said touch panel.

11. A touch panel comprising:

the touch screen according to claim 8;

a switch circuit that sequentially selects each of a plurality of said column direction wire bunches and each of a plurality of said row direction wire bunches; and

a detection processing circuit that performs a calculation process for calculating touch coordinates on said touch screen indicating a touch position touched with an indicator based on a result of detection of a change in a mutual capacitance between said column direction wire bunch and said row direction wire bunch selected by said switch circuit in accordance with the touch to said touch screen with said indicator.

12. A display device comprising:

the touch panel according to claim 11, and

a display panel mounted to said touch screen of said touch panel.