Active touch pen, touch input system and method of driving the same

Patent metadata

Field	Value
Publication number	US-11320918-B2
Application number	US-201916760298-A
Country	US
Kind code	B2
Filing date	Sep 18, 2019
Priority date	Sep 21, 2018
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

An active touch pen, a touch input system and a method of driving the same are provided. The active touch pen includes a pen tip and a pen body, where a control circuit and a signal supply circuit are in the pen body. The control circuit is configured to detect a detection parameter value corresponding to an inclination angle of the pen body, and adjust, according to the detection parameter value, a signal amplitude of an output signal supplied by the signal supply circuit; an input end of the signal supply circuit is connected to an output end of the control circuit, to supply the output signal through the pen tip.

First claim

What is claimed is:

1. An active touch pen, comprising a pen tip and a pen body, wherein a control circuit and a signal supply circuit are in the pen body;
wherein the control circuit is configured to detect a detection parameter value corresponding to an inclination angle of the pen body, and adjust, according to the detection parameter value, a signal amplitude of an output signal supplied by the signal supply circuit;
wherein an input end of the signal supply circuit is connected to an output end of the control circuit, and the output end of the signal supply circuit is connected to the pen tip, and the signal supply circuit is configured to supply the output signal through the pen tip;
wherein a resistance adjustment component is in the pen body, the resistance adjustment component is connected to the control circuit, and a resistance value of the resistance adjustment component increases or decreases with a change of the inclination angle of the pen body, and the control circuit is configured to control the signal amplitude of the output signal according to a change of the resistance value of the resistance adjustment component;
wherein the pen body comprises an accommodating cavity, the resistance adjustment component is in the accommodating cavity, the resistance adjustment component comprises a resistance element and a conductive liquid, a volume of the conductive liquid is smaller than a volume of the accommodating cavity;
wherein the resistance element is in electrical contact with the conductive liquid, and an end of the resistance element is electrically connected to the control circuit;
wherein the accommodating cavity comprises a first end surface, the end of the resistance element comprises a first end, and the first end of the resistance element is electrically connected to the control circuit through the first end surface;
wherein the accommodating cavity further comprises a second end surface opposite to the first end surface, and the end of the resistance element further comprises a second end, and the second end of the resistance element is electrically connected to the second end surface of the accommodating cavity; and
wherein the resistance element comprises a disconnection portion extending in an axial direction of the accommodating cavity, to disconnect the resistance element in the axial direction of the accommodating cavity, the conductive liquid is filled in the disconnected portion.

2. The active touch pen according to claim 1 , wherein the pen body comprises an accommodating cavity, the resistance adjustment component is in the accommodating cavity, the resistance adjustment component comprises a resistance element and a conductive liquid, a volume of the conductive liquid is smaller than a volume of the accommodating cavity;
the resistance element is through the accommodating cavity and is in electrical contact with the conductive liquid, and both ends of the resistance element are electrically connected to the control circuit.

3. The active touch pen according to claim 2 , wherein the accommodating cavity is columnar, and the resistance element is arranged along an axial direction of the accommodating cavity.

4. The active touch pen according to claim 2 , wherein the conductive liquid is an aqueous solution of a strong electrolyte, a material of the resistance element comprises at least one of iron, tungsten and nickel-chromium alloy.

5. The active touch pen according to claim 1 , wherein the pen body comprises an accommodating cavity, the resistance adjustment component is in the accommodating cavity, the resistance adjustment component comprises a conductive element and a conductive liquid, a volume of the conductive liquid is smaller than a volume of the accommodating cavity;
one end of the conductive element is at an end of the accommodating cavity and is electrically connected to the control circuit, and the other end of the conductive element extends into the accommodating cavity and is in electrical contact with conductive liquid in the accommodating cavity.

6. The active touch pen according to claim 5 , wherein there exist two conductive elements, and the two conductive elements are arranged at two ends of the accommodating cavity respectively.

7. The active touch pen according to claim 5 , wherein the conductive liquid is an aqueous solution of a strong electrolyte, a material of the conductive element comprises copper or graphite.

8. The active touch pen according to claim 1 , further comprising a resistance control switch configured to control an on-off of the resistance adjustment component.

9. The active touch pen according to claim 1 , wherein a length of the resistance element in an axial direction of the accommodating cavity is equal to a length of the accommodating cavity in the axial direction of the accommodating cavity.

10. A touch input system, comprising a touch component and an active touch pen, wherein the active touch pen is the active touch pen according to claim 1 ;
the touch component comprises a plurality of touch electrodes and a touch chip connected to the touch electrodes; the touch chip is configured to detect a capacitance change value of each touch electrode according to an output signal supplied by the active touch pen which is received by each touch electrode,
the capacitance change value of each touch electrode increases with an increasing of the signal amplitude of the output signal supplied by the active touch pen, and the capacitance change value of each touch electrode decreases with a decreasing of the signal amplitude of the output signal supplied by the active touch pen.

11. The touch input system according to claim 10 , further comprising: a display chip configured to display, according to the capacitance change value of each touch electrode detected by the touch chip, a handwriting of the active touch pen at a touch position;
wherein a width of the handwriting of the touch pen increases with an increasing of the capacitance change value of each touch electrode, and the width of the handwriting of the touch pen decreases with a decreasing of the capacitance change value of each touch electrode.

12. A method of driving a touch input system, applied to the touch input system according to claim 10 , comprising:
detecting, by the control circuit of the active touch pen, a detection parameter value corresponding to an inclination angle of the active touch pen, and adjusting, according to the detection parameter value, a signal amplitude of an output signal supplied by the signal supply circuit;
supplying, by the signal supply circuit of the active touch pen, the output signal through the pen tip; and
detecting, by a touch chip of the touch component, a capacitance change value of each touch electrode of the touch component according to an output signal supplied by the signal supply circuit which is received by each touch electrode of the touch component, wherein the capacitance change value of each touch electrode increases with an increasing of the signal amplitude of the output signal supplied by the active touch pen, and the capacitance change value of each touch electrode decreases with an decreasing of the signal amplitude of the output signal supplied by the active touch pen.

13. The driving method according to claim 12 , further comprising:
displaying, by a display chip, according to the capacitance change value of each touch electrode detected by the touch chip, a handwriting of the active touch pen at a touch position;
wherein a width of the handwriting of the touch pen increases with an increasing of the capacitance change value of each touch electrode, and the widt

Assignees

• Hefei Boe Optoelectronics Tech
• Boe Technology Group Co Ltd

Inventors

• Wang Meng
• Yang Guanglei
• Fang Zhixiang

Classifications

• G06F3/03545 Primary

  Pens or stylus · CPC title

• G06F3/0383 Primary

  Signal control means within the pointing device · 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

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/04162

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