Touch display device, touch circuit, pen, touch system, and multi-pen sensing method

Patent metadata

Field	Value
Publication number	US-11048360-B2
Application number	US-201816140903-A
Country	US
Kind code	B2
Filing date	Sep 25, 2018
Priority date	Sep 29, 2017
Publication date	Jun 29, 2021
Grant date	Jun 29, 2021

Abstract

Disclosed are a touch display device, a touch circuit, a pen, a touch system, and a multi-pen sensing method for receiving downlink signals output from two or more pens through one or more touch electrodes on a panel and distinguishably sensing the two or more pens based on unique information of the received downlink signals.

First claim

What is claimed is:

1. A touch circuit comprising:
a first circuit including a plurality of detection circuits that receive output signals from a touch panel that include a touch sensing signal and a downlink signal, a multiplexer that selects a signal to configure to receive the downlink signal from each of two or more pens through one or more touch electrodes within the touch panel, and an analog digital converter configured to convert the output voltage selectively output from the multiplexer to generate a sensing value; and
a second circuit receiving the sensing value from the analog digital converter to configure to sense the two or more pens such that touches of the two or more pens are distinguished based on unique information of the received downlink signal, transmitting an uplink signal to the plurality of detection circuits, and the uplink signal and the downlink signal are transmitted to the touch panel through the first circuit and the analog digital converter directly connected with the second circuit,
wherein the touch circuit is configured to supply the uplink signal including available unique information to the panel and receive the downlink signal through the panel, wherein the downlink signal has the unique information determined by a pen in contact with or in proximity to the panel based on the available unique information,
wherein each of the two or more pens configures the unique information that is information corresponding to, and different from, the available unique information provided from the touch circuit, and is extracted from a memory of each pen for a pen identification purpose,
wherein the uplink signal including the available unique information is supplied from the touch circuit to the panel in a touch driving period between two display driving periods in one frame time in which display driving and touch driving may be simultaneously performed,
wherein, when the touch circuit receives the downlink signal having identical unique information from the two or more pens after supplying the uplink signal including the available unique information to the panel, the touch circuit outputs a unique information reset signal to one or more of the two or more pens through the uplink signal and thereafter receives a downlink signal having new unique information from one or more of the two or more pens, and
wherein after the unique information reset signal is outputted to the one or more of the two or more pens through the uplink signal, the touch circuit transmits new available unique information through an uplink signal containing the new available unique information to only an area in the panel corresponding to a position of a first pen of the two or more pens, and thereafter, transmits new available unique information through an uplink signal containing updated new available unique information to only an area in the panel corresponding to a position of a second pen of the two or more pens.

2. The touch circuit of claim 1 , wherein the unique information of the downlink signal output from each of the two or more pens corresponds to a pen ID of each of the two or more pens.

3. The touch circuit of claim 1 , wherein the unique information of the downlink signal output from each of the two or more pens is a unique code expressed by the downlink signal output from each of the two or more pens.

4. The touch circuit of claim 3 , wherein the unique code expressed by the downlink signal output from each of the two or more pens is a direct sequence spread spectrum code orthogonal to each other.

5. The touch circuit of claim 1 , wherein the unique information of the downlink signal output from each of the two or more pens is a unique frequency of the downlink signal output from each of the two or more pens.

6. The touch circuit of claim 1 , wherein the touch circuit is configured to transfer the available unique information to the pen in contact with or in proximity to the panel by supplying a beacon signal having the available unique information to the panel, and the beacon signal is one of uplink signals defined by a protocol between the panel (TSP) and the pen and is supplied to the panel for one or more blank periods corresponding to a beacon signal transmission period among a plurality of blank periods within one frame time.

7. The touch circuit of claim 1 , wherein
the plurality of detection circuits correspondingly connected to a plurality of touch electrodes within the panel.

8. The touch circuit of claim 7 , wherein each of the plurality of detection circuits includes:
a decoder circuit configured to identify whether unique information of the downlink signal received from a corresponding touch electrode is included in an already known unique information list; and
a detector configured to output a voltage corresponding to unique information of the downlink signal received from a corresponding touch electrode (TE).

9. The touch circuit of claim 1 , wherein the first circuit is configured to supply the uplink signal including the available unique information to the panel and receive the downlink signal through the panel.

10. The touch circuit of claim 9 , wherein the first circuit or the second circuit is configured to update pre-stored available unique information when receiving the downlink signal having the unique information output from the pen in contact with or in proximity to the panel.

11. The touch circuit of claim 9 , wherein the first circuit is configured to transfer the available unique information to the pen in contact with or in proximity to the panel by supplying a beacon signal having the available unique information to the panel, and the beacon signal is one of uplink signals defined by a protocol between the panel and the pen and is supplied to the panel for one or more blank periods corresponding to a beacon signal transmission period among a plurality of blank periods within one frame time.

12. A touch display device comprising:
a touch panel on which a plurality of touch electrodes is arranged; and
a touch circuit configured to receive a downlink signal output from each of two or more pens through one or more touch electrodes of the panel and sense the two or more pens such that the two or more pens are distinguished from each other based on unique information of the received downlink signal, and inclduing a first circuit and a second circuit, the first circuit including a plurality of detection circuits, a multiplexer and an analog digital converter that directly connected with the second circuit,
wherein the plurality of detection circuits receives output signals from a touch panel that include a touch sensing signal and a downlink signal and the multiplexer selects a signal to configure to receive the downlink signal from each of two or more pens through one or more touch electrodes within the touch panel, and the analog digital converter is configured to convert the output voltage selectively output from the multiplexer to generate a sensing value; and
wherein the second circuit receives the sensing value from analog digital converter to configure to sense the two or more pens such that touches of the two or more pens are distinguished based on unique information of the received downlink signal, transmits an uplink signal to the plurality of detection circuits, and the uplink signal and the downlink signal are transmitted to the touch panel through the first circuit,
wherein the touch circuit is configured to supply the uplink signal including available unique information to the panel and receive the downlink signal through the panel,
wherein the downlink signal has the unique information determined by a pen in contact with or in pro

Assignees

• Lg Display Co Ltd

Inventors

• Jang Hyunguk
• Oh Seungseok
• Bae Sanghyuck
• Han Sungsu
• Ju Suyun
• Jung Doyoung

Classifications

• G06F1/24

  Resetting means · CPC title

• G06F2203/0384

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

• G06F2203/04104

  Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger · 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