Touch display device and touch sensing circuit

Patent metadata

Field	Value
Publication number	US-11243644-B2
Application number	US-201916726530-A
Country	US
Kind code	B2
Filing date	Dec 24, 2019
Priority date	Dec 28, 2018
Publication date	Feb 8, 2022
Grant date	Feb 8, 2022

Abstract

A touch display device comprises a touch panel including a plurality of touch electrodes; and a touch driving circuit configured to sense one or more of the plurality of touch electrodes, wherein the touch driving circuit has an operation period including a plurality of touch intervals that includes a first sensing interval and a second sensing interval, and the first sensing interval includes at least a first time division sensing interval and the second sensing interval includes at least a second time division sensing interval, and wherein the touch driving circuit is configured to detect a pen signal output from a first pen through one or more touch electrodes of the plurality of touch electrodes during the first time division sensing interval, and detect a pen signal output from a second pen through one or more touch electrodes of the plurality of touch electrodes during the second time division sensing interval.

First claim

What is claimed is:

1. A touch display device comprising:
a touch panel including a plurality of touch electrodes; and
a touch driving circuit configured to sense one or more of the plurality of touch electrodes,
wherein the touch driving circuit has an operation period including a plurality of touch intervals that includes a first sensing interval and a second sensing interval, and the first sensing interval includes at least a first time division sensing interval and the second sensing interval includes at least a second time division sensing interval,
wherein the touch driving circuit is configured to detect a first pen signal output from a first pen through one or more touch electrodes of the plurality of touch electrodes during the first time division sensing interval, and detect a second pen signal output from a second pen through one or more touch electrodes of the plurality of touch electrodes during the second time division sensing interval,
wherein the touch driving circuit is further configured to:
detect a third pen signal output from the first pen and having a first signal frequency through one or more touch electrodes during the first time division sensing interval; and
detect a fourth pen signal output from the second pen and having the first signal frequency through one or more touch electrodes during the second time division sensing interval,
wherein the first sensing interval further comprises a third time division sensing interval, and
wherein, when a third pen, which is different from the first pen and the second pen, is discovered, the touch driving circuit is configured to detect a fifth pen signal output from the third pen and having a second signal frequency, which is different from the first signal frequency, through one or more touch electrodes during the third time division sensing interval.

2. The touch display device of claim 1 , wherein the touch driving circuit is further configured to:
detect first data from the first pen during a first data sensing interval; and
detect second data from the second pen during a second data sensing interval.

3. The touch display device of claim 2 , wherein the touch driving circuit is configured to detect third data from the third pen during a third data sensing interval.

4. The touch display device of claim 3 , wherein the second sensing interval further includes a fourth time division sensing interval, wherein the touch driving circuit detects a sixth pen signal from a fourth pen different from the first to third pens during the fourth time division sensing interval, and
wherein the first and second sensing intervals are first and second position sensing intervals and the first to fourth time division sensing intervals are first to fourth time division position sensing intervals.

5. The touch display device of claim 3 , wherein the second sensing interval further includes a fourth time division sensing interval, wherein the touch driving circuit detects a seventh pen signal during the fourth time division sensing interval, and
wherein the first and second sensing intervals are first and second tilt sensing intervals and the first to fourth time division sensing intervals are first to fourth time division tilt sensing intervals.

6. The touch display device of claim 3 , wherein the second sensing interval further includes a fourth time division sensing interval, wherein the touch driving circuit detects an eighth pen signal during the fourth time division sensing interval,
wherein the first and second sensing intervals include first and second position sensing intervals and the first to fourth time division sensing intervals include first to fourth time division position sensing intervals, and
wherein the first and second sensing intervals further include first and second tilt sensing intervals and the first to fourth time division sensing intervals further include first to fourth time division tilt sensing intervals.

7. The touch display device of claim 1 , further comprising:
a touch controller configured to, based on a reference touch synchronization signal in which a first state interval defining a touch interval and a second state interval defining a non-touch interval are repeated, generate a touch synchronization signal in which a first voltage level interval and a second voltage level interval are repeated, and supply the touch synchronization signal to the touch driving circuit,
wherein one first state interval in the reference touch synchronization signal corresponds to two or more first voltage level intervals and one or more second voltage level intervals.

8. The touch display device of claim 7 , wherein the first sensing interval further includes a third time division sensing interval, and the second sensing interval further includes a fourth time division sensing interval, and
wherein one of the two or more first voltage level intervals includes the first time division sensing interval and the third time division sensing interval, and another of the two or more first voltage level intervals comprises the second time division sensing interval and the fourth time division sensing interval.

9. The touch display device of claim 1 , wherein operation modes of the touch display device comprise:
a search mode which is a default mode and operates when no touch input by a finger and a pen is made;
a pen ID mode for receiving a pen ID when a touch input by the pen is made;
a pen mode for sensing one or more of the position, the tilt, and data of the pen if the pen ID is received; and
a finger mode for sensing a touch by the finger if a touch input by the finger is made, and
the first sensing interval and the second sensing interval correspond to touch intervals when the touch driving circuit is in the pen mode.

10. The touch display device of claim 9 , wherein during the search mode, K touch intervals in one frame period comprises one or more beacon transmission intervals, n or more finger sensing intervals, and m pen position sensing intervals, wherein n≥1, m≥1, and K≥3,
during the n or more finger sensing intervals, a touch driving signal, the voltage level of which swings, is applied to the plurality of touch electrodes, and
during the m pen position sensing intervals, a DC voltage is applied to the plurality of touch electrodes.

11. The touch display device of claim 1 , wherein each of the plurality of touch intervals comprises three or more division intervals,
a pen signal comprising a plurality of pulses is applied to one or more touch electrodes in each of the three or more division intervals,
the plurality of pulses included in the pen signal in each of the three or more division intervals express one symbol, and
the touch driving circuit detects the pen signal based on pen pulses during a period, except for a symbol change time point related to position sensing.

12. A touch display device comprising:
a touch panel including a plurality of touch electrodes; and
a touch driving circuit configured to sense one or more of the plurality of touch electrodes,
wherein the touch driving circuit has an operation period including a plurality of touch intervals that includes a first sensing interval and a second sensing interval, and the first sensing interval includes at least a first time division sensing interval and the second sensing interval includes at least a second time division sensing interval,
wherein the touch driving circuit is configured to detect a first pen signal output from a first pen through one or more touch electrodes of the plurality of touch electrodes during the first time division sensing interval, and detect a second pen signal output from a seco

Assignees

• Lg Display Co Ltd

Inventors

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

Classifications

• G06F3/04166

  Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving (Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184) · 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

• G06F2203/04106

  Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection · CPC title

• G06F3/03545

  Pens or stylus · CPC title

• G06F3/04162

  for exchanging data with external devices, e.g. smart pens, via the digitiser sensing hardware · CPC title