Active pen sensing device, a sensing driving method, and a display device

Patent metadata

Field	Value
Publication number	US-12468408-B2
Application number	US-202418774358-A
Country	US
Kind code	B2
Filing date	Jul 16, 2024
Priority date	Aug 17, 2023
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

An active pen sensing device, a display device comprising same and a sensing driving method are provided; and the active pen sensing device can include a plurality of division blocks divided into a matrix along a first direction and a second direction intersecting the first direction, each of which comprises a plurality of sensing cells, a plurality of first sensing lines connected to the plurality of sensing cells of each of the plurality of division blocks along the first direction, a plurality of second sensing lines connected to the plurality of sensing cells of each of the plurality of division blocks along the second direction, and a sensing driving device connected to the plurality of first sensing lines and the plurality of second sensing lines to drive the plurality of division blocks.

First claim

What is claimed is:

1 . An active pen sensing device, comprising:
a plurality of division blocks divided into a matrix along a first direction and a second direction intersecting the first direction, each of which comprises a plurality of sensing cells; a plurality of first sensing lines connected to the plurality of sensing cells of each of the plurality of division blocks along the first direction; a plurality of second sensing lines connected to the plurality of sensing cells of each of the plurality of division blocks along the second direction; and a sensing driving device connected to the plurality of first sensing lines and the plurality of second sensing lines and configured to drive the plurality of division blocks, wherein the sensing driving device is configured to: detect the presence or absence of an active pen by activating the plurality of first sensing lines, when the active pen is detected, detect coordinates of the active pen by activating the plurality of first sensing lines and the plurality of second sensing lines, when the coordinates of the active pen are detected, perform local sensing by activating the first sensing lines and the second sensing lines connected to a specific division block at a first location where the active pen is located and first neighboring division blocks, and when the active pen moves from the first location to a second location while performing the local sensing, determine a specific division block at the second location where the active pen is newly located as a new specific division block, determine second neighboring division blocks located around the new specific division block based on a movement direction of the active pen, and exclude the first neighboring division blocks located on opposite sides of the second neighboring division blocks based on the new specific division block.

2 . The active pen sensing device of claim 1 , wherein the sensing driving device is configured to:
receive a first sensing signal through the plurality of first sensing lines to detect the presence or absence of the active pen during one section of a first active pen sensing section.

3 . The active pen sensing device of claim 1 , wherein a second active pen sensing section comprises a first section and a second section, and
when the active pen is detected, the sensing driving device is configured to: provide a driving signal to the plurality of first sensing lines during the first section and receive a second sensing signal through the plurality of second sensing lines during the second section.

4 . The active pen sensing device of claim 1 , wherein when the coordinates of the active pen are detected, the sensing driving device is configured to:
determine the first neighboring division blocks based on a current location of the active pen from a center point of the specific division block, and simultaneously receive a third sensing signal and a fourth sensing signal through the plurality of first sensing lines and the plurality of second sensing lines, respectively, connected to the specific division block and the determined first neighboring division blocks during one section of a third active pen sensing section.

5 . The active pen sensing device of claim 1 , wherein the sensing driving device comprises:
a first multiplexer connected to the plurality of first sensing lines; a second multiplexer connected to the plurality of second sensing lines; and a sensing controller configured to control the first multiplexer and the second multiplexer.

6 . The active pen sensing device of claim 5 , wherein the sensing driving device is configured to:
control the first multiplexer according to a first sensing control signal generated to detect the presence or absence of the active pen to receive a first sensing signal through the plurality of first sensing lines.

7 . The active pen sensing device of claim 5 , wherein the sensing driving device is configured to:
control the first multiplexer according to a second sensing control signal generated to detect the coordinates of the active pen to provide a driving signal to the plurality of first sensing lines, and control the second multiplexer according to the second sensing control signal to receive a second sensing signal through the plurality of second sensing lines.

8 . The active pen sensing device of claim 5 , wherein the sensing driving device is configured to:
control the first multiplexer and the second multiplexer according to a third sensing control signal generated to perform the local sensing to simultaneously a third sensing signal and a fourth sensing signal through the plurality of first sensing lines and the plurality of second sensing lines.

9 . The active pen sensing device of claim 1 , wherein when the active pen deviates more than a predetermined distance from the specific division block while performing the local sensing, the sensing driving device is configured to:
stop performing the local sensing and activate the plurality of first sensing lines to detect the presence or absence of the active pen.

10 . The active pen sensing device of claim 1 , wherein the first neighboring division blocks comprise two or more blocks adjacent to the specific division block.

11 . A sensing driving method in an active pen sensing device comprising a plurality of division blocks divided into a matrix along a first direction and a second direction intersecting the first direction, each of which comprises a plurality of sensing cells, a plurality of first sensing lines connected to the plurality of sensing cells of each of the plurality of division blocks along the first direction, a plurality of second sensing lines connected to the plurality of sensing cells of each of the plurality of division blocks along the second direction, and a sensing driving device connected to the plurality of first sensing lines and the plurality of second sensing lines to drive the plurality of division blocks, comprising:
detecting the presence or absence of an active pen by activating the plurality of first sensing lines; when the active pen is detected, detecting coordinates of the active pen by activating the plurality of first sensing lines and the plurality of second sensing lines; when the coordinates of the active pen are detected, performing local sensing by activating the first sensing lines and the second sensing lines connected to a specific division block at a first location where the active pen is located and first neighboring division blocks, and when the active pen moves from the first location to a second location while performing the local sensing, determine a specific division block at the second location where the active pen is newly located as a new specific division block, determine second neighboring division blocks located around the new specific division block based on a movement direction of the active pen, and exclude the first neighboring division blocks located on opposite sides of the second neighboring division blocks based on the new specific division block.

12 . The sensing driving method of claim 11 , wherein the detecting of the presence or absence of the active pen comprises:
receiving a first sensing signal through the plurality of first sensing lines to detect the presence or absence of the active pen during one section of a first active pen sensing section.

13 . The sensing driving method of claim 11 , wherein a second active pen sensing section comprises a first section and a second section, and
the detecting of the coordinates of the active pen comprises: when the active pen is detected, providing a driving

Assignees

• Lx Semicon Co Ltd

Inventors

• Lee Jae Hwan
• Nam Jeong Kwon
• Park Jung Hwan
• Lee Jun Young
• Chung Hyun Soo

Classifications

• G06F3/04164 Primary

  Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads · 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 Primary

  Pens or stylus · CPC title

• G06F3/04162 Primary

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

• G06F3/041661

  using detection at multiple resolutions, e.g. coarse and fine scanning; using detection within a limited area, e.g. object tracking window · CPC title