Stylus, touch panel, display device and touch sensing method

Patent metadata

Field	Value
Publication number	US-11379059-B2
Application number	US-202017256242-A
Country	US
Kind code	B2
Filing date	Jan 2, 2020
Priority date	Jan 2, 2019
Publication date	Jul 5, 2022
Grant date	Jul 5, 2022

Abstract

A stylus (100), a touch panel (200), a display device and a touch sensing method are provided. The stylus (100) includes: a first emitting electrode (12); a second emitting electrode (13), wherein a distance between the first emitting electrode (12) and the second emitting electrode (13) in an extension direction of the stylus (100) is greater than zero; and an emitting circuit (11), which is connected to the first emitting electrode (12) and the second emitting electrode (13), respectively. The emitting circuit (11) is used to emit a first electrical signal outwards through the first emitting electrode (12) and to emit a second electrical signal outwards through the second emitting electrode (13), so that the touch panel (200) determines a tilt angle (A1) of the stylus (100) relative to the touch panel (200) according to the received first and second electrical signals.

First claim

What is claimed is:

1. A stylus, comprising:
a first emitting electrode;
a second emitting electrode, wherein a distance between the first emitting electrode and the second emitting electrode in an extension direction of the stylus is greater than zero; and
an emitting circuit, which is connected to the first emitting electrode and the second emitting electrode, respectively, wherein the emitting circuit is used to emit a first electrical signal through the first emitting electrode and to emit a second electrical signal through the second emitting electrode, so that a touch panel determines a tilt angle of the stylus relative to the touch panel according to the first electrical signal and the second electrical signal which are received by the touch panel; and
the stylus further comprises:
a receiving electrode; and
a detecting circuit, which is connected to the receiving electrode, wherein the detecting circuit is used to detect a frequency of a touch scanning signal of the touch panel through the receiving electrode;
wherein the detecting circuit is further connected to the emitting circuit, and the emitting circuit is further used to generate the first electrical signal according to the frequency of the touch scanning signal, so that a frequency of the first electrical signal is n times greater than the frequency of the touch scanning signal, n being a positive integer; and
wherein the stylus further comprises a housing; the housing comprises a tip through hole at a tip of the stylus; the receiving electrode comprises a conductor rod with one end protruding from the tip through hole; and each of the first emitting electrode and the second emitting electrode comprises a conductor piece fitting an outer surface of the housing.

2. The stylus according to claim 1 , further comprising:
a first wake-up circuit, which is connected to the detecting circuit, wherein the first wake-up circuit is used to wake up the emitting circuit when the detecting circuit detects the frequency of the touch scanning signal of the touch panel.

3. The stylus according to claim 1 , further comprising:
a pressure sensor, which is connected to the receiving electrode, wherein the receiving electrode is at a tip of the stylus; and
a second wake-up circuit, which is connected to the pressure sensor and the detecting circuit, respectively, wherein the second wake-up circuit is used to wake up the detecting circuit when the pressure sensor detects that the tip of the stylus is pressed.

4. The stylus according to claim 3 , wherein the emitting circuit is further connected to the pressure sensor, and the emitting circuit is further used to generate the second electrical signal according to pressure information obtained by the pressure sensor, so that the second electrical signal comprises the pressure information.

5. The stylus according to claim 1 , wherein the emitting circuit is specifically used to emit the first electrical signal outwards through the first emitting electrode during a first period, and to emit the second electrical signal outwards through the second emitting electrode during a second period; and wherein the first period and the second period are separated from each other, and the frequency of the first electrical signal is different from the frequency of the second electrical signal.

6. A touch panel, comprising:
a plurality of touch electrodes;
a receiving circuit, which is connected to each of the touch electrodes, wherein the receiving circuit is used to receive the first electrical signal and the second electrical signal from the stylus according to claim 1 through the plurality of touch electrodes; and
a processing circuit, which is connected to the receiving circuit, wherein the processing circuit is used to detect emitting positions of the first electrical signal and the second electrical signal, and to determine the tilt angle of the stylus relative to the touch panel based on the emitting positions of the first electrical signal and the second electrical signal; and
wherein the receiving circuit comprises a scanning sub-circuit, which is connected to at least one of the touch electrodes, wherein the scanning sub-circuit is used to provide a touch scanning signal to the touch electrode which is connected to the scanning sub-circuit.

7. The touch panel according to claim 6 , wherein the receiving circuit comprises:
a sampling sub-circuit, which is connected to each of the touch electrodes, wherein the sampling sub-circuit is used to sample voltages of the plurality of touch electrodes; and
a detecting sub-circuit, which is connected to the sampling sub-circuit and the processing circuit, respectively, wherein the detecting sub-circuit is used to send a message of the stylus being detected to the processing circuit when detecting the first electric signal based on sampling data of the voltages of the plurality of touch electrodes, n being a positive integer.

8. The touch panel according to claim 7 , wherein a frequency at which the sampling sub-circuit samples the voltages of the plurality of touch electrodes is greater than the frequency of the first electrical signal.

9. The touch panel according to claim 6 , wherein the processing circuit is further used to determine a touch position of the stylus by combining the tilt angle of the stylus and the emitting positions of the first electrical signal and the second electrical signal.

10. The touch panel according to claim 6 , wherein the receiving circuit receives the first electrical signal and the second electrical signal by oversampling.

11. The touch panel according to claim 6 , wherein the processing circuit is further used to extract pressure information under which the tip of the stylus is pressed, from the second electrical signal information.

12. The touch panel according to claim 11 , wherein the processing circuit is further used to determine a stylus-touch force level of the stylus by combining the tilt angle of the stylus and the pressure information.

13. A display device, comprising the touch panel according to claim 6 .

14. A touch sensing method, wherein the method is applied to the touch panel according to claim 6 , and the method comprises:
receiving the first electrical signal and the second electrical signal from the stylus through the plurality of touch electrodes, wherein the first electrical signal is a signal emitted by the stylus through the first emitting electrode, and the second electrical signal is a signal emitted by the stylus through the second emitting electrode;
detecting emitting positions of the first electrical signal and the second electrical signal; and
determining the tilt angle of the stylus relative to the touch panel based on the emitting positions of the first electrical signal and the second electrical signal.

15. A display device, comprising the touch panel according to claim 7 .

16. A display device, comprising the touch panel according to claim 8 .

17. A display device, comprising the touch panel according to claim 9 .

18. A display device, comprising the touch panel according to claim 12 .

Assignees

• Beijing Boe Display Tech Co
• Boe Technology Group Co Ltd

Inventors

• He Jianzi
• Wang Jianting
• Guo Rui
• Meng Zhiming
• Geng Weibiao
• Su Junning

Classifications

• G06F3/03545 Primary

  Pens or stylus · 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

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/0442

  using active external devices, e.g. active pens, for transmitting changes in electrical potential to be received by the digitiser · CPC title

• G06F3/04166

  Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving (Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184) · CPC title