Touch screen, touch panel, display device, and electronic device

• US 9,760,230 B2
• Filed: 09/03/2015
• Issued: 09/12/2017
• Est. Priority Date: 09/17/2014
• Status: Active Grant

• Current Assignee: Trivale Technologies, LLC (Vector Capital Corporation)
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Ono, Takeshi, Nakamura, Tatsuya, Miyayama, Takashi, Agari, Masafumi, Orita, Tae
• Primary Examiner(s): Mehmood, Jennifer
• Assistant Examiner(s): Subedi, Deeprose
• Application Number:
  US14/844,296
• Publication Number:
  US 20160077629A1
• Time in Patent Office: 740 Days
• Field of Search: 345174
• 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

A touch screen according to the present invention includes: a substrate; and a plurality of row direction wirings and a plurality of column direction wirings which are disposed on the substrate to intersect through an insulating film in a stereoscopic view, and at an intersection portion of each of the row direction wirings and each of the column direction wirings, wiring width of at least one of the row direction wiring and the column direction wiring is wider than a portion other than the intersection portion in a plan view.

Claims

1. A touch screen comprising:

a substrate; and

a plurality of row direction wirings and a plurality of column direction wirings which are disposed on said substrate to intersect through an insulating film in a stereoscopic view,

wherein, throughout an intersection portion of each of said row direction wirings and each of said column direction wirings, the wiring widths of each of said row direction wirings and each of said column direction wirings are wider than a wiring width of each respective row direction wiring or each respective column direction wiring in a portion other than said intersection portion in a plan view and consequently capacitance at said intersection portion is increased with respect to said portion other than said intersection portion, and

an occurrence of dielectric breakdown of said insulating film due to a touch on said touch screen is suppressed by said increased capacitance.

2. The touch screen according to claim 1, wherein

each of said row direction wirings has wider wiring width also in adjacent regions adjacent to said intersection portion, and

each of said column direction wirings has wider wiring width also in adjacent regions adjacent to said intersection portion.

3. The touch screen according to claim 2, wherein

a length of a region in which the wiring width of said row direction wiring is wider in a direction in which the row direction wiring extends is equal to or more than the wiring width of said column direction wiring at said intersection portion, and

a length of a region in which the wiring width of said column direction wiring is wider in a direction in which the column direction wiring extends is equal to or more than the wiring width of said row direction wiring at said intersection portion.

4. The touch screen according to claim 1, wherein

at said intersection portion, one of the wiring widths of said row direction wiring and said column direction wiring is twice or more wider than the wiring width at the portion other than said intersection portion, and the other one of the wiring widths is uniform, and

the wiring width of one of said row direction wiring and said column direction wiring which is wider at said intersection portion is wider also in the adjacent regions adjacent to said intersection portion.

5. The touch screen according to claim 2, wherein

an outline of each of said row direction wirings is curved in a plan view in the region in which said wiring width of said row direction wiring is wider, and

an outline of each of said column direction wirings is curved in a plan view in the region in which said wiring width of said column direction wiring is wider.

6. The touch screen according to claim 4, wherein

an outline of each of said row direction wirings is curved in a plan view in the region in which said wiring width of said row direction wiring is wider, or

an outline of each of said column direction wirings is curved in a plan view in the region in which said wiring width of said column direction wiring is wider.

7. The touch screen according to claim 1, wherein said row direction wirings and said column direction wirings are meshed metal wirings.

8. A touch panel comprising:

the touch screen according to claim 1; and

a touch position detection circuit which detects a position pointed by a pointer on said touch screen, based on an electrostatic capacitance formed between said row direction wirings and said column direction wirings.

9. A display device comprising:

the touch panel according to claim 8; and

a display element which is disposed on an opposite side to a side from which said touch screen of said touch panel is pointed, and can display information.

10. An electronic device comprising:

the touch panel according to claim 8; and

a processor which electronically performs predetermined processing on information of said position detected by said touch position detection circuit of said touch panel.