Touch Display Device, Active Pen, Touch System, Touch Circuit, and Pen Recognition Method

Patent metadata

Field	Value
Publication number	US-2021181893-A1
Application number	US-202117187146-A
Country	US
Kind code	A1
Filing date	Feb 26, 2021
Priority date	Oct 25, 2016
Publication date	Jun 17, 2021
Grant date	—

Abstract

Embodiments described herein is able to provide a touch display device, an active pen, a touch system, a touch circuit, and a pen recognition method capable of efficiently providing a display function, a touch-sensing function, and a pen-touch-sensing function.

First claim

What is claimed is:

1 . A touch display device comprising:
a display panel comprising a plurality of touch electrodes for sensing touch of the display panel; and a touch circuit configured to supply a drive signal to the display panel, the touch circuit sensing at least one of a finger touch of the display panel based on a touch signal received in response to the drive signal or at least one pen touch of the display panel by at least one of a plurality of pens based on at least one pen signal received from the at least one of the plurality of pens, wherein one frame period of the touch display device includes a first period and a second period, the at least one pen signal output from the at least one of the plurality of pens to the display panel in at least one of the first period or the second period; wherein the at least one pen signal includes a plurality of pen pulses, and at least one part of the plurality of pen pulses is in either a first state in which the at least one part of the plurality of pen pulses has a first phase identical to a phase of an operation signal of the touch circuit or the drive signal or a second state in which the at least one part of the plurality of pen pulses has a second phase different from the phase of the operation signal of the touch circuit or the drive signal.

2 . The touch display device of claim 1 , wherein one of the first and second periods comprises a pen position/tilt sensing period, and at least one of a position of the at least one of the plurality of pens and a tilt angle of the at least one of the plurality of pens is sensed during the pen position/tilt sensing period.

3 . The touch display device of claim 2 , wherein time intervals between pen position/tilt sensing periods are equal.

4 . The touch display device of claim 2 , wherein another of the first period or the second period included in the one frame period includes a beacon signal transmission period, the display panel outputting a beacon signal to the at least one of the plurality of pens during the beacon signal transmission period, the beacon signal comprising pulses representing predetermined codes.

5 . The touch display device of claim 4 , wherein the touch display device operates in one of a pen-searching mode for identifying the at least one of the plurality of pens or a pen mode for communicating with the at least one of the plurality of pens based on the beacon signal.

6 . The touch display device of claim 4 , wherein the beacon signal further includes panel information associated with the display panel and driving control information that defines driving attributes of the at least one of the plurality of pens.

7 . The touch display device of claim 4 , wherein the beacon signal further comprises information on a frequency of the at least one part of the plurality of pen pulses representing the at least one pen signal, and a number of the pulses of the at least one part of the plurality of pen pulses representing the at least one pen signal.

8 . The touch display device of claim 4 , wherein the beacon signal further comprises information on a number of periods between the beacon signal transmission period and a subsequent beacon signal transmission period.

9 . The touch display device of claim 4 , wherein the one frame period includes a period without any pen signal between the beacon signal transmission period and a subsequent beacon signal transmission period.

10 . The touch display device of claim 1 , wherein the touch circuit is configured to perform pen recognition processing in a local sensing area corresponding to a partial area of the display panel.

11 . The touch display device of claim 10 , wherein the local sensing area comprises one or more partial areas of the display panel and a position or size of the local sensing area is variable.

12 . The touch display device of claim 1 , wherein the display panel transmits a ping signal comprising pulses that represents predetermined codes to the at least one of the plurality of pens in a first half of each of the first period and the second period, and during a second half of each of the first period and the second period the drive signal is supplied to the display panel and the at least one pen signal is output from the at least one of the plurality of pens.

13 . The touch display device of claim 1 , wherein at least one of an output position and timing of the at least one pen signal varies according to a type (alternating current (AC) or direct current (DC)) of the drive signal.

14 . The touch display device of claim 1 , wherein the at least one pen signal is for sensing at least one of a position, a tilt and additional information of an active pen, and includes one or both of a signal period including pulses having a frequency identical to the operation signal of the touch circuit or the drive signal and having the first phase, and a signal period including pulses having the frequency identical to the operation signal of the touch circuit or the drive signal and having the second phase.

15 . The touch display device of claim 1 , wherein each of the first and second periods in the one frame period includes an up-link period for signal transmission from the display panel to the at least one of the plurality of pens and a down-link period for signal transmission from the at least one of the plurality of pens to the display panel.

16 . The touch display device of claim 15 , wherein during the up-link period, a beacon signal or a ping signal distinguished from the drive signal is transmitted from the display panel to the at least one of the plurality of pens, and during the down-link period, the pen signals are output from the at least one of the plurality of pens to the display panel.

17 . The touch display device of claim 1 , wherein a signal transmitted from the display panel to the at least one of the plurality of pens and a signal transmitted from the at least one of the plurality of pens to the display panel are different digital modulation signals.

18 . A touch display device comprising:
a display panel comprising a plurality of touch electrodes for sensing touch of the display panel; and a touch circuit configured to supply a drive signal to the display panel, the touch circuit sensing at least one of a finger touch of the display panel based on a touch signal received in response to the drive signal or at least one pen touch of the display panel by at least one of a plurality of pens based on at least one pen signal received from the at least one of the plurality of pens in response to the drive signal, wherein one frame period of the touch display device includes a first period and a second period, the at least one pen signal output from the at least one of the plurality of pens to the display panel in at least one of the first period or the second period, wherein the at least one pen signal includes a plurality of pen pulses, and among the plurality of pen pulses, a first subset of pen pulses are in a first state, a second subset of pen pulses are in a second state, and a third subset of pen pulses are in a third state, the first state comprising the first subset of pen pulses having a first phase identical to a phase of an operation signal of the touch circuit or the drive signal, the second state comprising the second subset of pen pulses having a second phase different from the phase of the operation signal of the touch circuit or the drive signal, and the third state comprising the third subset of pen pulses comprising a constant value.

Assignees

• Lg Display Co Ltd

Inventors

• Bae Sanghyuck
• Lee Buyeol
• Shin Seungrok
• Kim Cheolse
• Lee Deuksu
• Jang Hyunwoo
• Kim Jaeseung
• Kim Younggyu
• Cho Hyunsuk

Classifications

• G06F2203/0384

  Wireless input, i.e. hardware and software details of wireless interface arrangements for pointing devices · CPC title

• G06F2203/0382

  Plural input, i.e. interface arrangements in which a plurality of input device of the same type are in communication with a PC · CPC title

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/038

  Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry · CPC title

• G06F3/03545

  Pens or stylus · CPC title