Active pen and touchscreen display device

Patent metadata

Field	Value
Publication number	US-10955964-B2
Application number	US-201916719456-A
Country	US
Kind code	B2
Filing date	Dec 18, 2019
Priority date	Dec 20, 2018
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

A touchscreen display device includes a display panel, a touch sensor, and a touch circuit. The touch sensor is disposed in an area corresponding to the display panel to output an uplink signal including signal intensity information regarding an intensity of a downlink signal output from an active pen. The touch circuit controls the touch sensor to output the uplink signal.

First claim

What is claimed is:

1. A touchscreen display device comprising:
a display panel;
a touch sensor disposed in an area corresponding to the display panel, the touch sensor configured to output an uplink signal including signal intensity information corresponding to an intensity of a downlink signal output from an active pen; and
a touch circuit configured to control the touch sensor to output the uplink signal,
wherein the uplink signal is output during an uplink signal output period of a signal detection period and the downlink signal output from the active pen is detected in a touch sensing period of the signal detection period, and
wherein the display device is operated to include at least one display period and at least one signal detection period that are repeatedly disposed during a one-frame period.

2. The touchscreen display device according to claim 1 , wherein the touch sensor is configured to output a position information signal corresponding to a touched position on the display panel in response to the downlink signal to the touch circuit, and
wherein the touch circuit is configured to receive the position information signal from the touch sensor in response to the downlink signal output from the active pen.

3. The touchscreen display device according to claim 2 , further comprising a timing controller configured to control driving of the display panel and configured to control an image to be displayed on the display panel in response to the position information signal.

4. The touchscreen display device according to claim 1 , wherein the signal intensity information includes information regarding at least one of a number of pulses of the downlink signal, a voltage level of the downlink signal and a number of conductive tips of the active pen generating the downlink signal among the plurality of conductive tips of the active pen.

5. The touchscreen display device according to claim 1 , further comprising a first communications module configured to receive status information of the active pen.

6. The touchscreen display device according to 5 , wherein the status information includes pressure information regarding a pressure detected by the active pen or distance information regarding the distance between the active pen and the touchscreen display device.

7. The touchscreen display device according to claim 1 , wherein the uplink signal further includes a pen ID of the active pen.

8. The touchscreen display device according to claim 1 , wherein the touch sensing periods are time-divided into first touch sensing periods and second touch sensing periods, and
wherein the downlink signal corresponds to a first active pen among a plurality of active pens in the first touch sensing periods and corresponds to a second active pen among the plurality of active pens in the second touch sensing periods.

9. The touchscreen display device according to claim 1 , wherein the uplink signal output periods are time-divided into first uplink signal output periods and second uplink signal output periods, and
wherein the uplink signal corresponds to a first active pen among the plurality of active pens in the first uplink signal output periods and corresponds to a second active pen among the plurality of active pens in the second uplink signal output periods.

10. The touchscreen display device according to claim 1 , wherein the signal detection period includes a period in which the touch sensor is configured to detect the downlink signal transferred from the active pen and a period in which the touch sensor is configured to detect a finger touch.

11. The touchscreen display device according to claim 1 , wherein the uplink signal is transmitted via one or more touch electrodes of the touch sensor to the active pen, and downlink signal is received by the touch sensor via the one or more touch electrodes.

12. A touchscreen display device comprising:
a display panel;
a plurality of touch sensors disposed in the display panel, configured to detect a signal output from an active pen or a finger touch in a touch sensing period of the display panel and configured to output an uplink signal including signal intensity information corresponding to an intensity of a downlink signal output from the active pen in an uplink signal output period of the display panel; and
a touch circuit configured to control the plurality of touch sensors to output the uplink signal,
wherein the uplink signal includes information regarding a driving mode of the active pen according to a distance between a tip of the active pen and a touch sensor of the plurality of touch sensors,
wherein the uplink signal output period is time-divided into a first uplink signal output period and a second uplink signal output period, and
wherein the uplink signal output in the first uplink signal output period corresponds to a first active pen among a plurality of active pens, and the uplink signal output in the second uplink signal output period corresponds to a second active pen among the plurality of active pens.

13. The touchscreen display device according to claim 12 , wherein the information regarding the driving mode of the active pen includes information regarding at least one of a number of pulses of the downlink signal, a voltage level of the downlink signal, a number of conductive tips generating the downlink signal among a plurality of conductive tips of the active pen, and an active pen ID of the active pen.

14. The touchscreen display device according to claim 12 , wherein the touch circuit is configured to obtain information regarding an inclination of the active pen in response to the downlink signal output from a plurality of conductive tips of the active pen.

15. A touch sensing system comprising a touchscreen display device and at least one active pen, wherein the touchscreen display device includes a touch sensor, wherein the touch sensor is configured to output an uplink signal to the active pen and the active pen is configured to output a downlink signal to the touchscreen display device, wherein the distance between the touch sensor and a tip of the active pen is calculated based on a signal intensity of the uplink signal and/or downlink signal, wherein an operation mode of the active pen is set based on the calculated distance,
wherein the uplink signal is output during an uplink signal output period of a signal detection period and the downlink signal output from the active pen is detected in a touch sensing period of the signal detection period, and
wherein the display device is operated to include at least one display period and at least one signal detection period that are repeatedly disposed during a one-frame period.

Assignees

• Lg Display Co Ltd

Inventors

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

Classifications

• G06F3/0383

  Signal control means within the pointing device · CPC title

• G06F3/04142

  the force sensing means being located peripherally, e.g. disposed at the corners or at the side of a touch sensing plate · 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

• G06F3/03545 Primary

  Pens or stylus · CPC title