Electrostatic input device

Patent metadata

Field	Value
Publication number	US-2023195261-A1
Application number	US-202318172475-A
Country	US
Kind code	A1
Filing date	Feb 22, 2023
Priority date	Oct 2, 2020
Publication date	Jun 22, 2023
Grant date	—

Abstract

An electrostatic input device includes: a plurality of first detection electrodes that are configured to detect approach of an object within a first distance from a detection face; a second detection electrode that is provided between the plurality of first detection electrodes and configured to detect approach of the object within a second distance from the detection face, where the second distance is longer than the first distance; and a detection circuit that is configured to detect change in capacitance of the plurality of first detection electrodes and the second detection electrode.

First claim

What is claimed is:

1 . An electrostatic input device, comprising:
a plurality of first detection electrodes that are configured to detect approach of an object within a first distance from a detection face; a second detection electrode that is provided between the plurality of first detection electrodes and configured to detect approach of an object within a second distance from the detection face, where the second distance is longer than the first distance; and a detection circuit that is configured to detect change in capacitance of the plurality of first detection electrodes and the second detection electrode.

2 . The electrostatic input device according to claim 1 , further comprising:
a plurality of first interconnects that respectively electrically connect the plurality of first detection electrodes and the detection circuit to each other; and a plurality of first noise cancelling interconnects that are same in number as the plurality of first interconnects, wherein the plurality of first noise cancelling interconnects are electrically connected to the detection circuit, and are respectively configured to obtain noise having a same phase as noise respectively obtained by the plurality of first interconnects.

3 . The electrostatic input device according to claim 2 , wherein the detection circuit is configured to detect the change in the capacitance of the plurality of first detection electrodes based on differences between a plurality of values of capacitance respectively obtained from the plurality of first detection electrodes via the plurality of first interconnects and levels of noise respectively obtained by the plurality of first noise cancelling interconnects.

4 . The electrostatic input device according to claim 2 , wherein:
the second detection electrode is divided into a plurality of second detection electrode sections; the electrostatic input device further includes
a plurality of second interconnects that respectively electrically connect the plurality of second detection electrode sections and the detection circuit to each other, and
a plurality of second noise cancelling interconnects that are same in number as the plurality of second interconnects; and
the plurality of second noise cancelling interconnects are electrically connected to the detection circuit, and are respectively configured to obtain noise having a same phase as noise respectively obtained by the plurality of second interconnects.

5 . The electrostatic input device according to claim 3 , wherein:
the second detection electrode is divided into a plurality of second detection electrode sections; the electrostatic input device further includes
a plurality of second interconnects that electrically connect the plurality of second detection electrode sections and the detection circuit to each other, and
a plurality of second noise cancelling interconnects that are same in number as the plurality of second interconnects; and
the plurality of second noise cancelling interconnects are electrically connected to the detection circuit, and are respectively configured to obtain noise having a same phase as noise respectively obtained by the plurality of second interconnects.

6 . The electrostatic input device according to claim 4 , wherein the detection circuit is configured to detect the change in the capacitance of the plurality of second detection electrode sections based on differences between a plurality of values of capacitance respectively obtained from the plurality of second detection electrode sections via the plurality of second interconnects and levels of noise respectively obtained by the plurality of second noise cancelling interconnects.

7 . The electrostatic input device according to claim 5 , wherein the detection circuit is configured to detect the change in the capacitance of the plurality of second detection electrode sections based on differences between a plurality of values of capacitance respectively obtained from the plurality of second detection electrode sections via the plurality of second interconnects and levels of noise respectively obtained by the plurality of second noise cancelling interconnects.

8 . The electrostatic input device according to claim 4 , wherein:
time constants of the plurality of first interconnects and time constants of the plurality of first noise cancelling interconnects are respectively made uniform so as to cancel noise of each other; and time constants of the plurality of second interconnects and time constants of the plurality of second noise cancelling interconnects are respectively made uniform so as to cancel noise of each other.

9 . The electrostatic input device according to claim 5 , wherein:
time constants of the plurality of first interconnects and time constants of the plurality of first noise cancelling interconnects are respectively made uniform so as to cancel noise of each other; and time constants of the plurality of second interconnects and time constants of the plurality of second noise cancelling interconnects are respectively made uniform so as to cancel noise of each other.

10 . The electrostatic input device according to claim 8 , wherein:
the plurality of first interconnects and the plurality of first noise cancelling interconnects are disposed as pairs each having the time constants that are made uniform, where the first interconnect and the first noise cancelling interconnect of each of the pairs are next to each other in a plan view; and the plurality of second interconnects and the plurality of second noise cancelling interconnects are disposed as pairs each having the time constants that are made uniform, where the second interconnect and the second noise cancelling interconnect of each of the pairs are next to each other in the plan view.

11 . The electrostatic input device according to claim 9 , wherein:
the plurality of first interconnects and the plurality of first noise cancelling interconnects are disposed as pairs each having the time constants that are made uniform, where the first interconnect and the first noise cancelling interconnect of each of the pairs are next to each other in a plan view; and the plurality of second interconnects and the plurality of second noise cancelling interconnects are disposed as pairs each having the time constants that are made uniform, where the second interconnect and the second noise cancelling interconnect of each of the pairs are next to each other in the plan view.

12 . The electrostatic input device according to claim 4 , wherein:
lengths of the plurality of first interconnects and lengths of the plurality of first noise cancelling interconnects are respectively made uniform; and lengths of the plurality of second interconnects and lengths of the plurality of second noise cancelling interconnects are respectively made uniform.

13 . The electrostatic input device according to claim 5 , wherein:
lengths of the plurality of first interconnects and lengths of the plurality of first noise cancelling interconnects are respectively made uniform; and lengths of the plurality of second interconnects and lengths of the plurality of second noise cancelling interconnects are respectively made uniform.

14 . The electrostatic input device according to claim 12 , wherein:
the plurality of first interconnects and the plurality of first noise cancelling interconnects are disposed as pairs each having the lengths that are made uniform, where the first interconnect and the first noise cancelling interconnect of each of the pairs are next to each other in a plan view; and the plurality

Assignees

• Alps Alpine Co Ltd

Inventors

• Shigetaka Hiroshi

Classifications

• G06F2203/04107

  Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds · CPC title

• G06F2203/04108

  Touchless 2D- digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface without distance measurement in the Z direction · CPC title

• G06F3/0418 Primary

  for error correction or compensation, e.g. based on parallax, calibration or alignment · CPC title

• G06F3/04164

  Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads · CPC title

• G06F3/044 Primary

  by capacitive means · CPC title