US 11,809,671 B2
Pressure-sensitive writing board and pressure-sensitive writing device
Zifeng Wang, Beijing (CN)
Assigned to BOE Technology Group Co., Ltd., Beijing (CN)
Filed by BOE Technology Group Co., Ltd., Beijing (CN)
Filed on Jan. 14, 2022, as Appl. No. 17/575,961.
Claims priority of application No. 202110309183.5 (CN), filed on Mar. 23, 2021.
Prior Publication US 2022/0308691 A1, Sep. 29, 2022
Int. Cl. G06F 3/046 (2006.01); G02F 1/1333 (2006.01); G06F 3/041 (2006.01)
CPC G06F 3/046 (2013.01) [G02F 1/13338 (2013.01); G06F 3/0412 (2013.01); G06F 3/0416 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A pressure-sensitive writing board, comprising:
a pressure-sensitive writing panel configured to form a writing region; and
a writing monitoring unit configured to determine position information about a writing tool at the writing region, convert the position information into writing trajectory information, and store the writing trajectory information,
wherein the pressure-sensitive writing panel is further configured to present the writing trajectory information at the writing region;
wherein the pressure-sensitive writing panel comprises a pressure-sensitive display module configured to present a writing trajectory in a predetermined color in accordance with the writing trajectory information at a region where a pressure is applied;
wherein the pressure-sensitive display module is further configured to erase the writing trajectory under the effect of a predetermined pulse electric field;
wherein the pressure-sensitive writing panel further comprises a protection layer attached to a surface of the pressure-sensitive display module where a pressure is applied;
wherein the protection layer comprises a flexible soft film subjected to atomization and hardening treatment;
wherein the writing monitoring unit comprises an electromagnetic induction layer attached to a surface of the pressure-sensitive writing panel away from a writing surface of the pressure-sensitive writing panel, a maximum value of a total thickness of the pressure-sensitive writing panel is positively associated with a sum of densities of antenna arrays on the electromagnetic induction layer, and the total thickness of the pressure-sensitive writing panel is a distance between a surface of the protection layer away from the pressure-sensitive display module and a surface of the pressure-sensitive display module adjacent to the electromagnetic induction layer.