TOUCH SCREEN, TOUCH PANEL, DISPLAY DEVICE, AND ELECTRONIC DEVICE

• US 20170131842A1
• Filed: 11/04/2016
• Published: 05/11/2017
• Est. Priority Date: 11/09/2015
• Status: Active Grant

• Current Assignee: Trivale Technologies, LLC (Vector Capital Corporation)
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: HASHIGUCHI, Takafumi
• Granted Patent: US 10,303,298 B2
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• 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 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• 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

Abstract

A touch screen includes column-direction wirings extending in a column direction, row-direction wirings extending in a row direction orthogonal to the column direction, and detection cells provided in areas in which the column-direction wirings and the row-direction wirings are three-dimensionally intersect with each other. The touch screen further includes additional capacitors that are provided in a mounting region in which mounting terminals of a plurality of lead lines, each of which is connected to one of the column-direction wirings or one of the row-direction wirings, are mounted, and are configured to apply electrostatic capacitance to the plurality of lead lines, and at least one potential fixed terminal configured to fix a potential of one electrode of each of the additional capacitors.

Claims

1. A touch screen comprising column-direction wirings extending in a column direction, row-direction wirings extending in a row direction orthogonal to said column direction, and detection cells provided in areas in which said column-direction wirings and said row-direction wirings are three-dimensionally intersect with each other, the touch screen further comprising:

additional capacitors that are provided in a mounting region in which mounting terminals of a plurality of lead lines, each of which is connected to one of said column-direction wirings or one of said row-direction wirings, are mounted, and are configured to apply electrostatic capacitance to said plurality of lead lines; and

at least one potential fixed terminal configured to fix a potential of one electrode of each of said additional capacitors.

2. The touch screen according to claim 1,

wherein said additional capacitors are provided at said plurality of lead lines except an outermost lead line, and

wherein a capacitance value of each of said additional capacitors is set at a value corresponding to a differential value of electrostatic capacitance between said outermost lead line and each of said plurality of lead lines except said outermost lead line.

3. The touch screen according to claim 2,

wherein electrostatic capacitance values of said additional capacitors are equally set at a value with respect to said plurality of lead lines except said outermost lead line.

4. The touch screen according to claim 2,

wherein electrostatic capacitance values of said additional capacitors are set such that the electrostatic capacitance values of said additional capacitors increase as their respective distances from said outermost lead line increase.

5. The touch screen according to claim 2,

wherein said at least one potential fixed terminal includes a plurality of potential fixed terminals formed between the mounting terminals of said plurality of lead lines in an identical layer with said mounting terminals, and

wherein each of said additional capacitors includes:

a first electrode connected to one of said mounting terminals; and

a second electrode connected to one of said potential fixed terminals.

6. The touch screen according to claim 2,

wherein said at least one potential fixed terminal is a potential fixed terminal formed in any one interval between the mounting terminals of said plurality of lead lines in an identical layer with said mounting terminals, and

wherein each of said additional capacitors includes:

a first additional capacitor including a first electrode connected to one of said mounting terminals, and a second electrode connected to one of said potential fixed terminals; and

a second additional capacitor including a first electrode connected to one of said mounting terminals, and a second electrode connected to a conductive pattern connected to said potential fixed terminal.

7. The touch screen according to claim 2,

wherein said at least one potential fixed terminal is a potential fixed terminal formed in any one interval between the mounting terminals of said plurality of lead lines in a layer lower than said mounting terminals, and

wherein each of said additional capacitors utilizes a corresponding one of said mounting terminals as a first electrode, and utilizes a potential fixed electrode, which is provided below the corresponding one of said mounting terminals and situated in an identical layer with said potential fixed terminal, as a second electrode,

wherein said second electrode is connected to a conductive pattern formed in an identical layer with said potential fixed terminal and connected to said potential fixed terminal, and

wherein an electrostatic capacitance is formed at a portion where said first electrode and said second electrode vertically overlaps with each other.

8. The touch screen according to claim 7, further comprising:

an upper potential fixed terminal provided above said potential fixed terminal and situated in an identical layer with said mounting terminal,

wherein said potential fixed terminal is electrically connected with said upper potential fixed terminal.

9. A touch panel comprising:

the touch screen according to claim 1; and

a touched-position detection circuit configured to detect a position touched by an indicator, which touches said touch screen, based on an electrostatic capacitance of said indicator with said row-direction wirings and said column-direction wirings.

10. A display device comprising:

the touch panel according to claim 9; and

a display module that is disposed on said touch screen of said touch panel on a side opposite to a side to be touched by said indicator and is configured to display information.

11. An electronic device comprising:

the touch panel according to claim 9; and

an electronic processing section configured to electrically perform a predetermined processing on information about said position detected by said touched-position detection circuit of said touch panel.