Active stylus pen, touch sensing system and driving method thereof

Patent metadata

Field	Value
Publication number	US-2017192534-A1
Application number	US-201615384766-A
Country	US
Kind code	A1
Filing date	Dec 20, 2016
Priority date	Dec 31, 2015
Publication date	Jul 6, 2017
Grant date	—

Abstract

An active stylus pen according to the present invention includes a first signal processor configured to generate a touch frame recognition signal for discriminating touch frames on the basis of sub-pulses corresponding to part of each touchscreen driving signal received from a touchscreen and a second signal processor configured to generate a pen driving signal synchronized with main pulses of each touchscreen driving signal other than the sub-pulses and to vary the pen driving signal in units of a touch frame according to the touch frame recognition signal such that additional pen information is reflected in the pen driving signal.

First claim

What is claimed is:

1 . An active stylus pen, comprising:
a first signal processor configured to generate a touch frame recognition signal for discriminating touch frames on the basis of sub-pulses corresponding to part of each touchscreen driving signal received from a touchscreen; and a second signal processor configured to generate a pen driving signal synchronized with main pulses of each touchscreen driving signal other than the sub-pulses and to vary the pen driving signal in units of a touch frame according to the touch frame recognition signal such that additional pen information is reflected in the pen driving signal.

2 . The active stylus pen according to claim 1 , wherein the first signal processor counts an interval between a first sub-pulse of a touchscreen driving signal and a second sub-pulse of another touchscreen driving signal neighboring the touchscreen driving signal to generate a first count value and generates the touch frame recognition signal when the first count value exceeds a predetermined threshold value.

3 . The active stylus pen according to claim 1 , wherein the first signal processor counts the sub-pulses included in each touchscreen driving signal to generate a second count value and generates the touch frame recognition signal when the second count value satisfies a predetermined value.

4 . The active stylus pen according to claim 1 , wherein the second signal processor varies a pulse amplitude of the pen driving signal in units of a touch frame according to the touch frame recognition signal such that the additional pen information is reflected in the pen driving signal.

5 . The active stylus pen according to claim 1 , wherein the second signal processor varies a pulse duty of the pen driving signal in units of a touch frame according to the touch frame recognition signal such that the additional pen information is reflected in the pen driving signal.

6 . The active stylus pen according to claim 1 , wherein the second signal processor allocates 1 bit of the pen driving signal in which the additional pen information has been reflected per touch frame.

7 . The active stylus pen according to one of claim 1 , wherein the additional pen information includes pen pressure information indicating pressure when the active stylus pen touches the touchscreen, button state information indicating whether at least one function button included in the active stylus pen and executing a specific function is activated, and pen identification information for discriminating the active stylus pen from other active stylus pens.

8 . The active stylus pen according to claim 1 , wherein the touchscreen driving signal further includes a beacon signal containing a pen operation mode, information indicating hovering or contact and information indicating whether tilt data is transmitted.

9 . The active stylus pen according to claim 8 , wherein the sub-pulses and the beacon signal are realized as a patterned ping signal as a synchronization signal for synchronization between the main pulses and the pen driving signal.

10 . The active stylus pen according to claim 9 , wherein the synchronization signal is configured as a direct sequence spread spectrum (DSSS) code.

11 . The active stylus pen according to claim 9 , wherein a plurality of bits are allocated to the synchronization signal depending on a pattern of the synchronization signal such that a command is transmitted from the touchscreen to the active stylus pen to secure various additional functions.

12 . A touch sensing system, comprising:
a touchscreen; a touch driver configured to apply a touchscreen driving signal to the touchscreen and to sense a capacitance variation in the touchscreen; and an active stylus pen configured to generate a pen driving signal and to transmit the pen driving signal to the touchscreen, wherein the active stylus pen comprises: a first signal processor configured to generate a touch frame recognition signal for discriminating touch frames on the basis of sub-pulses corresponding to part of each touchscreen driving signal received from the touchscreen; and a second signal processor configured to generate the pen driving signal synchronized with main pulses of each touchscreen driving signal other than the sub-pulses and to vary the pen driving signal in units of a touch frame according to the touch frame recognition signal such that additional pen information is reflected in the pen driving signal.

13 . The touch sensing system according to claim 12 , wherein the first signal processor counts an interval between a first sub-pulse of a touchscreen driving signal and a second sub-pulse of another touchscreen driving signal neighboring the touchscreen driving signal to generate a first count value and generates the touch frame recognition signal when the first count value exceeds a predetermined threshold value.

14 . The touch sensing system according to claim 12 , wherein the first signal processor counts the sub-pulses included in each touchscreen driving signal to generate a second count value and generates the touch frame recognition signal when the second count value satisfies a predetermined value.

15 . The touch sensing system according to claim 12 , wherein the second signal processor varies a pulse amplitude of the pen driving signal in units of a touch frame according to the touch frame recognition signal such that the additional pen information is reflected in the pen driving signal.

16 . The touch sensing system according to claim 12 , wherein the second signal processor varies a pulse duty of the pen driving signal in units of a touch frame according to the touch frame recognition signal such that the additional pen information is reflected in the pen driving signal.

17 . The touch sensing system according to claim 12 , wherein the second signal processor allocates 1 bit of the pen driving signal in which the additional pen information has been reflected per touch frame.

18 . The touch sensing system according to one of claim 12 , wherein the additional pen information includes pen pressure information indicating pressure when the active stylus pen touches the touchscreen, button state information indicating whether at least one function button included in the active stylus pen and executing a specific function is activated, and pen identification information for discriminating the active stylus pen from other active stylus pens.

19 . The touch sensing system according to claim 12 , wherein the touchscreen driving signal further includes a beacon signal containing a pen operation mode, information indicating hovering or contact and information indicating whether tilt data is transmitted.

20 . The touch sensing system according to claim 19 , wherein the sub-pulses and the beacon signal are realized as a patterned ping signal as a synchronization signal for synchronization between the main pulses and the pen driving signal.

21 . The touch sensing system according to claim 20 , wherein the synchronization signal is configured as a DSSS code.

22 . The touch sensing system according to claim 20 , wherein a plurality of bits are allocated to the synchronization signal depending on a pattern of the synchronization signal such that a command is transmitted from the touchscreen to the active stylus pen to secure various additional functions.

23 . A method of driving a touch sensing system, comprising:
bringing an active stylus pen i

Assignees

• Lg Display Co Ltd

Inventors

• Han Sungsu
• Jang Hyunguk
• Kim Sungchul
• Bae Sanghyuck
• Ju Suyun
• Jung Doyoung

Classifications

• G06F3/03545

  Pens or stylus · CPC title

• G06F3/0383 Primary

  Signal control means within the pointing device · CPC title

• G06F3/044

  by capacitive means · 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