Input detection system and input support device

Patent metadata

Field	Value
Publication number	US-2022147191-A1
Application number	US-202117511940-A
Country	US
Kind code	A1
Filing date	Oct 27, 2021
Priority date	Nov 12, 2020
Publication date	May 12, 2022
Grant date	—

Abstract

An input detection system includes a plurality of electrodes arrayed in a detection region, and an input support device including an LC circuit, a first electrode coupled to one end side of the LC circuit, a second electrode coupled to another end side of the LC circuit, and a housing accommodating therein at least the LC circuit. The input support device is disposed overlapping with a plurality of the electrodes, the housing is a conductor, the LC circuit includes a first capacitor and a second capacitor coupled in series between the one end side and the other end side of the LC circuit, and a coupling portion between the first capacitor and the second capacitor is coupled to the housing.

First claim

What is claimed is:

1 . An input detection system comprising:
a plurality of electrodes arrayed in a detection region; and an input support device including an LC circuit, a first electrode coupled to one end side of the LC circuit, a second electrode coupled to another end side of the LC circuit, and a housing accommodating therein at least the LC circuit, wherein the input support device is disposed overlapping with a plurality of the electrodes, the housing is a conductor, the LC circuit includes a first capacitor and a second capacitor coupled in series between the one end side and the other end side of the LC circuit, and a coupling portion between the first capacitor and the second capacitor is coupled to the housing.

2 . The input detection system according to claim 1 , wherein
a ratio of a capacitance value of the first capacitor to a capacitance value of the second capacitor satisfies a relation in Equation (1) below:
CA:CB=S 1: S 2  (1),

where CA is the capacitance value of the first capacitor, CB is the capacitance value of the second capacitor, S 1 is an area of the first electrode, and S 2 is an area of the second electrode.

3 . The input detection system according to claim 1 , wherein
a ratio of a capacitance value of the first capacitor to a capacitance value of the second capacitor satisfies a relation in Equation (2) below:
CA:CB=CE 1: CE 2  (2),

where CA is the capacitance value of the first capacitor, CB is the capacitance value of the second capacitor, CE 1 is interelectrode capacitance formed between the first electrode and a plurality of the electrodes facing the first electrode, and CE 2 is interelectrode capacitance formed between the second electrode and a plurality of the electrodes facing the second electrode.

4 . The input detection system according to claim 1 , wherein
a ratio of a capacitance value of the first capacitor to a capacitance value of the second capacitor satisfies a relation in Equation (3) below:
CA+Cp 1: CB+Cp 2= CE 1: CE 2  (3),

where CA is the capacitance value of the first capacitor, CB is the capacitance value of the second capacitor, Cp 1 is a capacitance value of parasitic capacitance formed on the one end side of the LC circuit, Cp 2 is a capacitance value of parasitic capacitance formed on the other end side of the LC circuit, CE 1 is a capacitance value of interelectrode capacitance formed between the first electrode and a plurality of the electrodes facing the first electrode, and CE 2 is a capacitance value of interelectrode capacitance formed between the second electrode and a plurality of the electrodes facing the second electrode.

5 . The input detection system according to claim 1 , wherein the coupling portion of the LC circuit is coupled to a reference potential through the housing.

6 . The input detection system according to claim 1 , wherein
the electrode overlapping with one of the first electrode and the second electrode is supplied with a reference potential, and the electrode overlapping with another of the first electrode and the second electrode is supplied with a detection drive signal.

7 . An input support device comprising:
an LC circuit; a first electrode coupled to one end side of the LC circuit; a second electrode coupled to another end side of the LC circuit; and a housing accommodating therein at least the LC circuit, wherein the housing is a conductor, the LC circuit includes a first capacitor and a second capacitor coupled in series between the one end side and the other end side of the LC circuit, and a coupling portion between the first capacitor and the second capacitor is coupled to the housing.

Assignees

• Japan Display Inc

Inventors

• Kakinoki Yuto
• Hayashi Makoto
• Kono Takaaki

Classifications

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G06F3/044

  by capacitive means · CPC title

• G06F2203/04114

  Touch screens adapted for alternating or simultaneous interaction with active pens and passive pointing devices like fingers or passive pens · CPC title

• G06F2203/04103

  Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices · CPC title

• G06F3/04162

  for exchanging data with external devices, e.g. smart pens, via the digitiser sensing hardware · CPC title