Liquid crystal blackboard capable of achieving partial erasing

Abstract

The invention discloses a liquid crystal blackboard capable of achieving partial erasing. The liquid crystal blackboard includes a liquid crystal display layer, an identification device, and an erasing circuit, wherein the liquid crystal display layer includes a display surface, and the liquid crystal display layer displays corresponding images according to pressure touch-control tracks received by the display surface; the identification device is used for identifying the projecting position and the projecting outline of an erasing piece on the display surface, and when the projecting outlineof the erasing piece exceeds a preset area, a partial erasing signal is generated; and the erasing circuit is used for erasing the images on the display surface corresponding to the projecting position according to the partial erasing signal. According to the liquid crystal blackboard capable of achieving partial erasing, a partial area of writing content is erased, other areas are not influencedby erasing, the defect that a traditional technology can only achieve entirely erasing is overcome, the work efficiency and using experience of a user are improved, and the commercial value of the liquid crystal blackboard and applied equipment thereof is improved.

Description

technical field [0001] Embodiments of the present invention relate to liquid crystal technology, in particular to a partially erasable liquid crystal blackboard. Background technique [0002] The liquid crystal blackboard of the prior art can only be erased on the whole screen, and cannot be partially erased. After writing a lot of content on the liquid crystal blackboard, if there is a mistake in it, or after writing a formula, it is found that there is a wrong operation symbol in the middle, Just must all erase written content, rewrite just can be corrected, and this causes great inconvenience to the use of liquid crystal blackboard, affects the efficiency of writing. Contents of the invention [0003] The invention provides a partially erasable liquid crystal blackboard to overcome the defect that the liquid crystal writing board in the prior art cannot be partially wiped, resulting in low writing efficiency of the liquid crystal writing board. [0004] An embodiment o...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a partially erasable liquid crystal blackboard to overcome the defect that the liquid crystal writing board in the prior art cannot be partially wiped, resulting in low writing efficiency of the liquid crystal writing board

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