Liquid crystal handwriting board, handwriting apparatus, and handwriting system

Patent metadata

Field	Value
Publication number	US-12504658-B2
Application number	US-202218027930-A
Country	US
Kind code	B2
Filing date	May 27, 2022
Priority date	May 27, 2022
Publication date	Dec 23, 2025
Grant date	Dec 23, 2025

Abstract

Provided is a liquid crystal handwriting board. The liquid crystal handwriting board includes: a first base plate and a second base plate that are oppositely disposed, and a liquid crystal layer disposed between the first base plate and the second base plate, wherein the liquid crystal layer includes bistable liquid crystal molecules; the first base plate includes: a first substrate, and an electromagnetic touch layer and a pixel electrode layer that are disposed on a side of the first substrate, wherein the electromagnetic touch layer is provided with a plurality of electromagnetic signal lines, each two adjacent electromagnetic signal lines being connected in series; and the second base plate includes: a second substrate, and a common electrode layer that is disposed on a side of the second substrate.

First claim

What is claimed is:

1 . A liquid crystal handwriting board, comprising: a first base plate and a second base plate that are oppositely disposed, and a liquid crystal layer disposed between the first base plate and the second base plate, wherein
the liquid crystal layer comprises bistable liquid crystal molecules; the first base plate comprises: a first substrate, and an electromagnetic touch layer and a pixel electrode layer that are disposed on a side of the first substrate, wherein the electromagnetic touch layer is provided with a plurality of electromagnetic signal lines, the plurality of electromagnetic signal lines being sequentially connected in series one by one and a number of the plurality of electromagnetic signal lines being more than two; and the second base plate comprises: a second substrate, and a common electrode layer that is disposed on a side of the second substrate.

2 . The liquid crystal handwriting board according to claim 1 , wherein the first base plate further comprises: a plurality of first connection structures and a plurality of second connection structures, wherein the plurality of first connection structures are all distributed on one side of the plurality of electromagnetic signal lines, and the plurality of second connection structures are all distributed on another side of the plurality of electromagnetic signal lines; wherein
one end of a first electromagnetic signal line is electrically connected to one end of a second electromagnetic signal line by one first connection structure, and another end of the first electromagnetic signal line is electrically connected to one end of a third electromagnetic signal line by one second connection structure, wherein the first electromagnetic signal line is one of the plurality of electromagnetic signal lines, the second electromagnetic signal line is an electromagnetic signal line in the plurality of electromagnetic signal lines disposed on a side of the first electromagnetic signal line, and the third electromagnetic signal line is an electromagnetic signal line in the plurality of electromagnetic signal lines disposed on a side, distal from the second electromagnetic signal line, of the first electromagnetic signal line; and the plurality of first connection structures and the plurality of second connection structures are all switches.

3 . The liquid crystal handwriting board according to claim 2 , wherein the first base plate further comprises: a plurality of data lines and a plurality of gate lines, wherein the plurality of electromagnetic signal lines in the electromagnetic touch layer are at least one of the plurality of data lines and the plurality of gate lines.

4 . The liquid crystal handwriting board according to claim 3 , wherein
each of the switches comprises a first electrode, a second electrode, and a control electrode, wherein the control electrode is configured to conduct the first electrode and the second electrode upon receiving a conduction signal, and the first electrode and the second electrode are respectively electrically connected to end parts of two of the plurality of electromagnetic signal lines; the first base plate further comprises: at least two switch control lines, wherein in the at least two switch control lines, one switch control line is electrically connected to the control electrodes of at least part of the plurality of first connection structures, and another switch control line is electrically connected to the control electrodes of at least part of the plurality of second connection structures; wherein in the case that both the first connection structure and the second connection structure are turned on under control of the at least two switch control lines, the electromagnetic signal lines electrically connected to the first connection structure and the second connection structure are sequentially connected in series.

5 . The liquid crystal handwriting board according to claim 4 , wherein the at least two switch control lines comprise N groups of switch control lines, N being an integer greater than 1; wherein
one group of switch control lines comprises: one switch control line for being electrically connected to the control electrodes of at least part of the plurality of first connection structures, and one switch control line for being electrically connected to the control electrodes of at least part of the plurality of second connection structures; and the control electrodes of the adjacent first connection structures are respectively electrically connected to different groups of switch control lines; and the control electrodes of the adjacent second connection structures are respectively electrically connected to different groups of switch control lines.

6 . The liquid crystal handwriting board according to claim 5 , comprising: N adjacently disposed first connection structures, and N adjacently disposed second connection structures;
wherein the N adjacently disposed first connection structures are respectively electrically connected to different groups of the N groups of switch control lines, and the N adjacently disposed second connection structures are respectively electrically connected to different groups of the N groups of switch control lines.

7 . The liquid crystal handwriting board according to claim 4 , wherein the at least two switch control lines comprise two switch control lines disposed at the same layer;
wherein in the two switch control lines, one switch control line is electrically connected to the control electrodes of all the plurality of first connection structures, and another switch control line is electrically connected to the control electrodes of all the plurality of second connection structures.

8 . The liquid crystal handwriting board according to claim 4 , wherein the electromagnetic touch layer is disposed on a side, facing the second base plate, of the first substrate, the first base plate includes two electromagnetic touch layers, the electromagnetic signal lines in one electromagnetic touch layer are the data lines, and the electromagnetic signal lines in another electromagnetic touch layer are the gate lines; the data lines extend along a first direction, the gate lines extend along a second direction, the first direction being different from the second direction;
the at least two switch control lines comprise: two first switch control lines and two second switch control lines, wherein an extension direction of the first switch control lines is the second direction, and an extension direction of the second switch control lines is the first direction; the data lines in the plurality of data lines serving as the electromagnetic signal lines are multiplexed data lines; the gate lines in the plurality of gate lines serving as the electromagnetic signal lines are multiplexed gate lines; wherein the plurality of data lines are arranged between the two first switch control lines, and the first switch control lines are electrically connected to the control electrodes of the switches for connecting two adjacent multiplexed data lines; and the plurality of gate lines are arranged between the two second switch control lines, and the second switch control lines are electrically connected to the control electrodes of the switches for connecting two adjacent multiplexed gate lines.

9 . The liquid crystal handwriting board according to claim 8 , wherein at least one of the multiplexed data line and the multiplexed gate line is provided with a plurality of electromagnetic enhancement parts and a plurality of connection parts which are electrically connected, wherein the plurality of electromagnetic enhancement parts and the plurality of connection parts are alternately arranged one

Assignees

• Shandong Lanbeisite Educational Equipment Group
• Beijing Boe Optoelectronics Tech Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Zhao Yu
• Wu Xiaojuan
• Ge Yang
• Wang Jian
• Wang Jiaxing
• Wang Xiuliang
• Han Tianyang

Classifications

• G06F3/046 Primary

  by electromagnetic means · CPC title

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G02F1/1391

  Bistable or multi-stable liquid crystal cells (G02F1/141 takes precedence) · CPC title

• G02F1/134309

  characterised by their geometrical arrangement · CPC title

• G02F1/136286

  Wiring, e.g. gate line, drain line · CPC title