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

Patent metadata

Field	Value
Publication number	US-11029790-B2
Application number	US-202016802236-A
Country	US
Kind code	B2
Filing date	Feb 26, 2020
Priority date	Jun 30, 2017
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

A touch display device may include: a panel including a plurality of touch electrodes, and a touch circuit configured to: transfer a panel driving signal to the panel, and receive a pen information signal, output from a pen in response to the panel driving signal, through the panel, each of the panel driving signal and the pen information signal including a plurality of pulses, the pen information signal including one or more state sections among: an in-phase state section including pulses in phase with the pulses of the panel driving signal, an antiphase state section including pulses having a different phase from the pulses of the panel driving signal, and a passive state section distinguished from the in-phase state section and the antiphase state section.

First claim

What is claimed is:

1. A pen working in concert with a touch display device, comprising:
a pen tip;
a processor configured to output a pen information signal through the pen tip,
wherein the pen information signal is output by the pen through the pen tip during a pen driving period including a first state period, a second state period, and a third state period,
wherein the pen information signal includes:
a first state signal being transmitted from the pen tip during the first state period,
a second state signal being transmitted from the pen tip during the second state period, and
a third state signal being transmitted from the pen tip during the third state period,

wherein the first state signal includes a plurality of first pulses,
wherein the second state signal includes a plurality of second pulses having a inversed phase with the plurality of first pulses, and
wherein the third state signal includes:
a predetermined DC voltage or a floating signal, or
a plurality of third pulses different from the plurality of first pulses and the plurality of second pulses.

2. The pen of claim 1 , wherein:
the processor is further configured to receive a panel driving signal from the touch display device through the pen tip; and
the first state signal has a same phase with the panel driving signal.

3. The pen of claim 1 , wherein the pen information signal represents at least one of information selected from among: pen identification information, pen button information, a or a pen pressure, battery state information, and checksum information.

4. The pen of claim 1 , wherein:
the first state signal of the pen information signal represents a first symbol value;
the second state signal of the pen information signal represents a second symbol value different from the first symbol value; and
the third state signal of the pen information signal represents a third symbol value different from the first symbol value and the second symbol value.

5. The pen of claim 1 , wherein:
the first state signal of the pen information signal represents two or more symbol values by having a plurality of the first state signal different duty ratios; or
the second state signal of the pen information signal represents two or more symbol values by having a plurality of the second state signal different duty ratios.

6. The pen of claim 1 , wherein:
the first state signal of the pen information signal represents two or more symbol values by having a plurality of the first state signal different amplitudes; or
the second state signal of the pen information signal represents two or more symbol values by having a plurality of the second state signal different amplitudes.

7. The pen of claim 1 , wherein:
the pen is further configured to receive a beacon signal from the touch display device through the at least one touch electrode in the touch display device; and
the beacon signal includes at least one piece of information selected from among: a panel information, a panel driving mode information, a pen output signal characteristics information, a touch driving information, a multiplexer driving information, a power mode information, and a driving synchronization information.

8. The pen of claim 1 , wherein the beacon signal includes a high level signal section and a low level signal section that are aperiodically repeated.

9. The pen of claim 1 , wherein a time of the first state period is same as a time of the second state period or a time of the third state period.

10. A touch display device, comprising:
a panel including:
a plurality of touch electrodes; and
a plurality of touch signal lines; and

a touch circuit configured to:
transfer a panel driving signal to the panel; and
receive a pen information signal output from a pen,

wherein the pen is configured to output the pen information signal through a pen tip during a pen driving period including a first state period, a second state period, and a third state period,
wherein the pen information signal includes:
a first state signal being transmitted from the pen tip during the first state period,
a second state signal being transmitted from the pen tip during the second state period, and
a third state signal being transmitted from the pen tip during the third state period,

wherein the first state signal includes a plurality of first pulses,
wherein the second state signal includes a plurality of second pulses having a inversed phase with the plurality of first pulses, and
wherein the third state signal includes a predetermined DC voltage or a floating signal or a plurality of third pulses different from the plurality of first pulses and the plurality of second pulses.

11. The pen of claim 10 , wherein the pen includes a processor configured to receive the panel driving signal from the touch display device through the pen tip.

12. The pen of claim 10 , wherein:
the touch display device is configured to be operated in a first mode or a second mode;
the touch display device includes a plurality of first frames during the first mode; and
the touch display device includes a plurality of second frames during the second mode.

13. The touch display device of claim 12 , wherein:
the first mode of the touch display device is a pen mode; and
the second mode of the touch display device is a pen searching mode.

14. The touch display device of claim 13 , wherein a number of long horizontal blanks corresponding to a time of finger touch sensing period within a time of a single frame during the pen mode is less than a number of long horizontal blanks corresponding to a time of finger touch sensing period within the time of the single frame during the pen searching mode.

15. The touch display device of claim 13 , wherein a number of long horizontal blanks corresponding to a time of pen recognition period within a time of a single frame during the pen mode is larger than a number of long horizontal blanks corresponding to a time of pen recognition period within the time of the single frame during the pen searching mode.

16. The touch display device of claim 12 , wherein:
the first mode of the touch display device includes at least one beacon transmission period;
the second mode of the touch display device includes at least one beacon transmission period; and
the number of the beacon transmission period during one frame of the first mode is less than the number of the beacon transmission period during one frame of the second mode.

17. The touch display device of claim 12 , wherein:
one of the plurality of first frames includes:
a beacon transmission period in which the beacon signal is transmitted; and
a finger touch sensing period in which the touch circuit applies a touch driving signal for finger touch sensing to at least one touch electrode;

the touch driving signal includes a high level signal section and a low level signal section that are periodically repeated; and
the beacon signal includes a high level signal section and a low level signal section that are aperiodically repeated.

18. The pen of claim 10 , wherein each of the plurality of touch signal lines is electrically connected to a corresponding one of the plurality of touch electrodes.

Assignees

• Lg Display Co Ltd

Inventors

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

Classifications

• 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

• G06F3/0442 Primary

  using active external devices, e.g. active pens, for transmitting changes in electrical potential to be received by the digitiser · CPC title

• G06F3/0446

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title

• G06F3/03545

  Pens or stylus · CPC title

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title