Liquid crystal handwriting board, handwriting device, and method for controlling handwriting device

A handwriting board device, comprising:

• a liquid crystal handwriting board, and a position determination assembly;
• wherein the liquid crystal handwriting board comprises:
• a liquid crystal panel, and a drive assembly electrically connected to the liquid crystal panel;
• wherein
• the liquid crystal panel comprises:
• a first substrate and a second substrate that are opposite to each other, and a liquid crystal layer disposed between the first substrate and the second substrate, wherein the first substrate comprises a plurality of bulk pixel electrodes, and the second substrate comprises a planar common electrode;
• the drive assembly is configured to apply, based on position information of a region to be erased, a pixel voltage to a pixel electrode in the region to be erased in the case that the liquid crystal handwriting board is in an erasing mode, such that a voltage difference is developed between the pixel electrode in the region to be erased and the common electrode;
• and
• the position determination assembly is configured to be electrically connected to the drive assembly in the liquid crystal handwriting board and acquire the position information of the region to be erased in the liquid crystal panel in the liquid crystal handwriting board, and send the position information of the region to be erased to the drive assembly, wherein the first substrate further comprises a second planarization layer disposed on the pixel electrode;
• wherein the first substrate further comprises:
• a plurality of thin-film transistors electrically connected to the drive assembly, wherein the pixel electrode is electrically connected to at least one of the plurality of thin-film transistors;
• wherein the first substrate further comprises a first planarization layer disposed on the at least one thin-film transistor.