Unlock instant, AI-driven research and patent intelligence for your innovation.

Input detection system

a detection system and input technology, applied in the field of input detection systems, can solve the problems of false detection, the drive frequency of the touch panel to deviate from the resonant frequency and the circuit constant of the input support device cannot be adjusted,

Active Publication Date: 2022-10-27
JAPAN DISPLAY INC
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present patent relates to an input detection system that can prevent false detection caused by external noise. The system includes a detection device with sensor electrodes and an input support device with an LC circuit and electrodes. An adjustment circuit is used to adjust a circuit constant that is added to a capacitance between the sensor electrodes and the electrodes of the input support device. This helps prevent the drive frequency of the touch panel from deviating from the resonant frequency of the input support device. The technical effect of this invention is to improve the accuracy and reliability of input detection in an input detection system.

Problems solved by technology

If a frequency of external noise is close to the drive frequency of the touch panel and the resonant frequency of the input support device, false detection may occur.
Although the drive frequency of the touch panel can be adjusted by a circuit in the touch panel, a circuit constant of the input support device cannot be adjusted in some cases because the input support device includes no internal power supply.
That is to say, adjustment of the drive frequency of the touch panel may cause the drive frequency of the touch panel to deviate from the resonant frequency of the input support device.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Input detection system
  • Input detection system
  • Input detection system

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0027]FIG. 1 is a perspective view schematically illustrating an input detection system according to a first embodiment. FIG. 2 is a cross-sectional view cut along line II-II′ in FIG. 1. As illustrated in FIG. 1 and FIG. 2, an input detection system 1 includes a display device 2 and an input support device 3.

[0028]One direction of a plane (upper surface 111a) of the display device 2 is a first direction Dx, and a direction orthogonal to the first direction Dx is a second direction Dy. The second direction Dy is not limited to be orthogonal to the first direction Dx and may intersect with the first direction Dx at an angle other than 90°. A third direction Dz orthogonal to the first direction Dx and the second direction Dy corresponds to the thickness direction of an array substrate SUB1.

[0029]The display device 2 is, for example, a liquid crystal display (LCD). The display device 2 is however not limited thereto and may be, for example, an organic electro-luminescence (EL) display p...

second embodiment

[0125]FIG. 16 is a cross-sectional view illustrating a schematic cross-sectional structure of an input detection system according to a second embodiment. The above-mentioned first embodiment has described the example in which the input support device 3 is arranged above the display device 2 including the mutual electrostatic capacitance-type touch sensor with the drive electrodes Tx and the detection electrodes Rx. The configuration is however not limited thereto. The touch sensor (display device 2) may be of a self-electrostatic capacitance type (self-type).

[0126]As illustrated in FIG. 16, a display device 2A has a plurality of detection electrodes DE (sensor electrodes) provided above the array substrate SUB1 in an input detection system 1C in the second embodiment. The detection electrodes DE serve as both of common electrodes in display and electrodes for detecting a detection target such as the input support device 3 and the finger Fg. In the second embodiment, the detection el...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
angleaaaaaaaaaa
capacitanceaaaaaaaaaa
frequencyaaaaaaaaaa
Login to View More

Abstract

An input detection system includes a detection device including a plurality of sensor electrodes arrayed in a detection region, an input support device including an LC circuit, a first electrode coupled to one end side of the LC circuit, and a second electrode coupled to another end side of the LC circuit, and a control circuit including a drive signal supply circuit supplying a drive signal to the sensor electrodes and an adjustment circuit coupled to the sensor electrodes. The adjustment circuit adjusts a circuit constant that is added to a capacitance between the sensor electrode and the first electrode or the second electrode facing the sensor electrode.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of priority from Japanese Patent Application No. 2021-071916 filed on Apr. 21, 2021, the entire contents of which are incorporated herein by reference.BACKGROUND1. Technical Field[0002]The present disclosure relates to an input detection system.2. Description of the Related Art[0003]Japanese Patent Nos. 6342105 and 6532631 describe an input support device (referred to as an operation knob or a knob in Japanese Patent Nos. 6342105 and 6532631) that is placed on a touch panel configured to detect change in electrostatic capacitance or change in a contact region and supports input operations through the touch panel. As a method for detecting the input support device, a method with which the input support device is detected using resonance of a resonance circuit provided in the input support device has been known. In an input detection system using such an input support device, drive electrodes of the touch ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): G06F3/041G06F3/044G06F3/0362G06F3/02G06F3/039
CPCG06F3/0418G06F3/0446G06F3/04166G06F3/0362G06F3/02G06F3/0393
Inventor KAKINOKI, YUTOKONO, TAKAAKIHAYASHI, MAKOTO
Owner JAPAN DISPLAY INC