Touch display device, active pen, touch system, touch circuit, and pen recognition method

Patent metadata

Field	Value
Publication number	US-10963107-B2
Application number	US-201916591155-A
Country	US
Kind code	B2
Filing date	Oct 2, 2019
Priority date	Oct 25, 2016
Publication date	Mar 30, 2021
Grant date	Mar 30, 2021

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. An active pen comprising:
a pen body;
a first pen tip configured to receive a beacon signal or a ping signal from a touch display device and configured to transmit pen signals to the touch display device; and
a micro control unit configured to control a pulse generation timing of the pen signals based on the beacon signal or the ping signal from the touch display device;
wherein the active pen has a first state and a second state to generate the pen signals including a plurality of pen pulses, the pen signals in the first state are in-phase with an operation signal of a touch circuit or a drive signal of the touch display device, and the pen signals in the second state are in an inverse-phase with the operation signal of the touch circuit or the drive signal of the touch display device.

2. The active pen of claim 1 , wherein the touch display device includes a display panel comprising a plurality of touch electrodes for sensing touch of the display panel.

3. The active pen of claim 2 , wherein the touch circuit of the touch display device is configured to supply the 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 senses a pen touch of the display panel by the active pen based on pen signals received from the active pen in response to the drive signal.

4. The active pen of claim 2 , wherein at least one frame period of the touch display device includes a plurality of alternating display periods for displaying images and a plurality of blank periods, the pen signals output from the active pen to the display panel in two or more blank periods from the plurality of blank periods in the one frame period of the touch display device.

5. The active pen of claim 4 , wherein the two or more blank periods comprise a pen position/tilt sensing period, at least one of a position of the active pen or a tilt angle of the active pen is sensed during the pen position/tilt sensing period.

6. The active pen of claim 5 , wherein time intervals between a plurality of pen position/tilt sensing periods are equal.

7. The active pen of claim 4 , wherein the touch display device outputs the beacon signal to the active pen during a beacon signal transmission period, the beacon signal comprising pulses representing predetermined codes.

8. The active pen of claim 7 , wherein the beacon signal transmission period is in the plurality of blank periods.

9. The active pen of claim 1 , wherein the touch display device operates in one of a pen-searching mode for identifying the active pen or a pen mode for communicating with the active pen based on the beacon signal.

10. The active pen of claim 1 , wherein the beacon signal includes display panel information of the touch display device and driving control information that defines driving attributes of the active pen.

11. The active pen of claim 1 , wherein the beacon signal includes a frequency of the plurality of pen pulses that represents the pen signals, and a number of the plurality of pen pulses that represents the pen signals.

12. The active pen of claim 1 , wherein the beacon signal defines a number of blank periods between a beacon signal transmission period and a subsequent beacon signal transmission period.

13. The active pen of claim 12 , wherein a blank period in which no pen signal is emitted to save power is between the beacon signal transmission period and the subsequent beacon signal transmission period.

14. The active pen of claim 4 , wherein the touch display device transmits the ping signal comprising pulses that represent predetermined codes to the active pen during the plurality of blank periods.

15. The active pen of claim 1 , wherein the active pen further comprising a pressure sensor configured to sense a pressure of the active pen.

16. The active pen of claim 1 , wherein the active pen further comprising a second pen tip,
wherein an angle between the active pen and the touch display device is calculated based on a position of a first pen tip and a position of the second pen tip.

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