Touch device for passive resonant stylus, driving method for the same and touch system

Patent metadata

Field	Value
Publication number	US-11675446-B2
Application number	US-202217582135-A
Country	US
Kind code	B2
Filing date	Jan 24, 2022
Priority date	Jan 29, 2021
Publication date	Jun 13, 2023
Grant date	Jun 13, 2023

Abstract

An embodiment of the present invention provides a touch device for sensing a position of a stylus including a resonance circuit, including: a plurality of electrode; and a touch controller configured to receive a sensing signal from the electrodes to determine a position of the stylus, wherein the electrodes includes electrodes in which directions of currents induced in the electrodes by the resonance circuit are opposite to each other.

First claim

What is claimed is:

1. A touch device for sensing a position of a stylus including a resonance circuit, comprising:
a display panel;
a window positioned on the display panel;
a plurality of electrodes positioned between the display panel and the window; and
a touch controller configured to receive a sensing signal from the electrodes to determine a position of the stylus close to the window,
wherein directions of currents induced in two electrodes of the plurality of electrodes by the resonance circuit are opposite to each other,
wherein the touch controller determines a gap between the two electrodes as a position of the stylus,
wherein
some of the electrodes are positioned in a touch area, and
the touch device further includes
a plurality of traces positioned outside the touch area and connected to correspond to the electrodes,
wherein the traces include traces in which directions of currents induced in the traces by the resonance circuit are opposite to each other; and
wherein the plurality of electrodes are also configured to sense a position of an object using a capacitance sensing method.

2. The touch device of claim 1 , wherein
a current in a same direction as that of correspondingly connected traces is induced in the electrodes.

3. The touch device of claim 1 , wherein
a current in a different direction from that of correspondingly connected traces is induced in the electrodes.

4. The touch device of claim 1 , wherein
the electrodes include a plurality of first electrodes extending in a first direction, and
the traces include first traces extending in a second direction intersecting the first direction and connected to first ends of a first group of the first electrodes, and second traces connected to second ends of a second group of the first electrodes.

5. The touch device of claim 1 , wherein
the touch controller determines a gap between electrodes having a largest difference in magnitude of the induced currents as a position of the stylus.

6. The touch device of claim 1 , further comprising
an antenna configured to include a plurality of dummy electrodes formed on a same layer as that of the electrodes and a plurality of bridges connecting the dummy electrodes to each other,
wherein the touch controller applies a driving signal to the antenna to output an electro-magnetic signal for resonating the resonance circuit.

7. The touch device of claim 1 , wherein
each of the electrodes includes two signal input terminals, and
the touch controller grounds one of the two signal input terminals and applies a driving signal to the other so that each of the electrodes outputs an electro-magnetic signal for resonating the resonance circuit.

8. The touch device of claim 1 , wherein
the electrodes are formed of a metal mesh.

9. The touch device of claim 1 , wherein
each of the electrodes includes two signal input terminals, and
the touch controller applies driving signals of opposite phases to the two signal input terminals so that each of the electrodes outputs an electro-magnetic signal for sensing the resonance circuit.

10. The touch device of claim 1 , further comprising
a magnetic field shielding layer formed on a different layer from that of the electrodes.

11. The touch device of claim 10 , wherein
the display panel has a folding area that is bent about a folding axis and a non-folding area spaced apart by the folding area, and
the magnetic field shielding layer is positioned to correspond to both the folding area and the non-folding area.

12. The touch device of claim 10 , wherein
the display panel has a folding area that is bent about a folding axis and a non-folding area spaced apart by the folding area, and
the magnetic field shielding layer is spaced apart to correspond to the non-folding area.

13. A driving method for a touch device for sensing a position of a stylus including a resonance circuit driving, comprising:
outputting a driving signal to a plurality of electrodes;
receiving a sensing signal from the electrodes, the sensing signal including currents induced in the electrodes in opposite directions by the resonance circuit; and
determining the position of the stylus from the sensing signal,
wherein the determining of the position of the stylus includes
determining a gap between electrodes in which the directions of the induced currents are opposite to each other as a position of the stylus,
wherein some of the electrodes are positioned in a touch area,
the touch device further includes a plurality of traces positioned outside the touch area and connected to correspond to the electrodes, and
the sensing signal includes currents induced in the tracers in opposite directions by the resonance circuit, and
wherein the plurality of electrodes are also configured to sense a position of an object using a capacitance sensing method.

14. The driving method of claim 13 , wherein
a current in a same direction as that of correspondingly connected traces is induced in the electrodes.

15. The driving method of claim 13 , wherein
a current in a different direction from that of correspondingly connected traces is induced in the electrodes.

16. The driving method of claim 13 , wherein
the determining of the position of the stylus includes
determining a gap between electrodes having a largest difference in magnitude of the induced currents as a position of the stylus.

17. A touch system comprising:
a stylus configured to include a resonance circuit; and
a touch sensor configured to receive a sensing signal from a plurality of electrodes to determine a position of the stylus,
wherein directions of currents induced in two electrodes of the plurality of electrodes by the resonance circuit are opposite to each other,
wherein the touch sensor determines a gap between the two as a position of the stylus,
wherein
some of the electrodes are positioned in a touch area,
the touch sensor further includes a plurality of traces positioned outside the touch area and connected to correspond to the electrodes, and
wherein the traces include traces in which directions of currents induced in the traces by the resonance circuit are opposite to each other,
wherein the plurality of electrodes are also configured to sense a position of an object using a capacitance sensing method.

Assignees

• Hideep Inc

Inventors

• Kim Seyeob
• Kim Bonkee
• Woo Hyoungwook
• Moon Hojun
• Lee Hwanhee
• Kim Jongsik
• Cho Youngho

Classifications

• G06F3/0445

  using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer · CPC title

• G06F3/046

  by electromagnetic means · CPC title

• G06F3/0446

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title

• G06F3/0443

  using a single layer of sensing electrodes · CPC title

• G06F2203/04102

  Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper · CPC title