Touch apparatus and touch detection method thereof

Patent metadata

Field	Value
Publication number	US-11983353-B2
Application number	US-202217584561-A
Country	US
Kind code	B2
Filing date	Jan 26, 2022
Priority date	Jun 12, 2019
Publication date	May 14, 2024
Grant date	May 14, 2024

Abstract

a touch device according to an exemplary embodiment includes: a plurality of touch electrodes; and a driver/receiver that applies driving signals, each having a frequency corresponding to a resonance frequency of a stylus pen, to the plurality of touch electrodes, and receives detection signals from the plurality of touch electrodes, wherein the driving signals may include a first driving signal and a second driving signal, each having a different phase.

First claim

What is claimed is:

1. A touch device comprising: a plurality of electrodes; and a driver/receiver that applies driving signals, each having a frequency corresponding to a resonance frequency of a stylus pen, to the plurality of electrodes to resonate the stylus pen during a first section, and receives detection signals from the plurality of electrodes during the first section, the first section includes a plurality of first sub-sections during which the driving signals is applied and a plurality of second sub-sections, wherein the driving signals include a first driving signal and a second driving signal having different phase and the same frequency from the first driving signal, the driver/receiver applies the first driving signal to the plurality of electrodes during some of the first sub-section of the plurality of first sub-sections, and applies the second driving signal to the plurality of electrodes during the remaining of the first sub-section of the plurality of first sub-sections, and the driver/receiver receives the detection signals from the plurality of electrodes during the plurality of second sub-sections.

2. The touch device of claim 1 , further comprising a controller that acquires touch data based on the detection signals received from the plurality of electrodes during the plurality of second sub-sections.

3. The touch device of claim 2 , wherein, among the plurality of first-subsections, a number of first sub-sections during which the first driving signal is applied and a number of first sub-sections during which the second driving signal is applied are the same.

4. The touch device of claim 2 , wherein, among the plurality of first-subsections, a number of first sub-sections during which the first driving signal is applied and a number of first sub-sections during which the second driving signal is applied are different from each other.

5. The touch device of claim 2 , wherein one of the plurality of first sub-sections during which the first driving signal is applied and another of the plurality of first sub-sections during which the second driving signal is applied are alternately arranged with a predetermined period in the first section.

6. The touch device of claim 2 , wherein one of the plurality of first sub-sections during which the first driving signal is applied and another of the plurality of first sub-sections during which the second driving signal is applied repeat at least once in the first section.

7. The touch device of claim 2 , wherein each of one of the plurality of first sub-sections during which the first driving signal is applied and another of the plurality of first sub-sections during which the second driving signal is applied is continuously arranged at least two times in the first section.

8. The touch device of claim 2 , wherein one of the plurality of first sub-sections during which the first driving signal is applied is continuously arranged in a first number of times, another of the plurality of first sub-sections during which the second driving signal is applied is continuously arranged in a second number of times, and the first number is different from the second number.

9. The touch device of claim 2 , wherein one of the plurality of first sub-sections during which the first driving signal is applied is continuously arranged in a first number of times and another of the plurality of first sub-sections during which the second driving signal is applied is continuously arranged in the first number of times.

10. The touch device of claim 2 , wherein
the controller calculates a first amplitude value by multiplying a first value by an amplitude value of a first detection signal when the detection signals are first detection signals received from the plurality of electrodes corresponding to the first driving signal, calculates a second amplitude value by multiplying a second value by an amplitude value of a second detection signal when the detection signals are second detection signals received from the plurality of electrodes corresponding to the second driving signal, and acquires the touch data based on the first amplitude value and the second amplitude value, and
the first value and the second value have the same absolute value and different signs.

11. The touch device of claim 3 , wherein the touch data corresponds to a capacitance change amount of an electrode of the plurality of electrodes, a change amount of the detection signal, or an analog-to-digital converter output due to a touch of the stylus pen.

12. A touch detection method of a touch device, comprising: selectively applying one of a first driving signal and a second driving signal, each having a frequency corresponding to a resonance frequency of a stylus pen and having different phases, to a plurality of electrodes to resonate the stylus pen; receiving detection signals from the plurality of electrodes; calculating amplitude of each of the detection signals; repeating the applying, the receiving, and the calculating a predetermined number of times during a first section; acquiring a final signal amplitude corresponding to each of the plurality of electrodes by using the amplitude calculated whenever the calculating is performed; and acquiring touch data by touch of the stylus pen based on the final signal amplitude, wherein the first section includes a plurality of first sub-sections and a plurality of second sub-sections, wherein the first driving signal is applied to the plurality of electrodes during some of the first sub-section of the plurality of first sub-sections and the second driving signal having different phase from the first driving signal is applied to the plurality of electrodes during the remaining of the first sub-section of the plurality of first sub-sections, and the detection signals are received from the plurality of electrodes during the plurality of the second sub-sections.

13. The touch detection method of claim 12 , wherein the selective applying comprises selectively applying one of the first driving signal and the second driving signal such that the number of times the first driving signal is applied and the number of times the second driving signal is applied are the same within the predetermined number of times.

14. The touch detection method of claim 12 , wherein the selective applying comprises selectively applying one of the first driving signal and the second driving signal such that the number of times the first driving signal is applied and the number of times the second driving signal is applied are different from each other within the predetermined number of times.

15. The touch detection method of claim 12 , wherein the selective applying comprises selectively applying one of the first driving signal and the second driving signal such that the first driving signal and the second driving signal are alternately applied at a predetermined cycle within the predetermined number of times.

16. The touch detection method of claim 12 , wherein the selective applying comprises selectively applying one of the first driving signal and the second driving signal such that application of the first driving signal and application of the second driving signal repeat at least once within the predetermined number of times.

17. The touch detection method of claim 12 , wherein the selective applying comprises selectively applying one of the first driving signal and the second driving signal such that each of the first driving signal and the second driving signal is continuously applied at least two times, and
the number of times of the first driving signal is continuously

Assignees

• Hideep Inc

Inventors

• Kim Seyeob
• Kim Bonkee
• Cho Youngho

Classifications

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/04186 Primary

  Touch location disambiguation · CPC title

• G06F3/04166 Primary

  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

• G06F3/04182 Primary

  Filtering of noise external to the device and not generated by digitiser components · CPC title

• G06F3/0441

  using active external devices, e.g. active pens, for receiving changes in electrical potential transmitted by the digitiser, e.g. tablet driving signals · CPC title