Partial erasing device for liquid crystal tablet and writing and erasing pen for liquid crystal tablet

Abstract

A selectively erasing device and a writing-erasing pen for a liquid crystal writing board. The selectively erasing device comprises a power source, a driving circuitry and an ultrasonic generating assembly (10), wherein the power source and the ultrasonic generating assembly (10) are electrically connected to the driving circuitry, the ultrasonic generating assembly (10) comprises a matching layer (11), an ultrasonic generator (12) and a backing layer (13) stacked in sequence, and the matching layer (11) is positioned on the side contacting with the liquid crystal writing board. The selectively erasing device and the writing-erasing pen apply an ultrasonic technology to fulfill the selectively erasing, resulting in energy-saving and environmental protection, as well as safe and convenient to use.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display applications, in particular to a partial erasing device for a liquid crystal tablet and a writing and erasing pen for a liquid crystal tablet. Background technique [0002] At present, in the field of liquid crystal writing boards, the erasing method of liquid crystal writing boards is mainly to erase all when powering on. This method has a great impact on user experience, and it is also the biggest reason why liquid crystal writing boards cannot expand the market, especially entering the education market. resistance. There are five external fields that affect the arrangement and structure of liquid crystals: sound, light, electricity, heat, and magnetism. The current mainstream partial erasing method uses three external fields: light, electricity, and heat, but light and heat will accelerate liquid crystal handwriting. As the board ages, using an electric field to achieve partial ...

AI Technical Summary

Problems solved by technology

[0002] At present, in the field of liquid crystal writing boards, the erasing method of liquid crystal writing boards is mainly to erase all when powering on. This method has a great impact on user experience, and it is also the biggest reason why liquid crystal writing boards cannot expand the market, especially entering the education market. resistance

There are five external fields that affect the arrangement and structure of liquid crystals: sound, light, electricity, heat, and magnetism. The current mainstream partial erasing method uses three external fields: light, electricity, and heat, but light and heat will accelerate liquid crystal handwriting. Due to the aging of the board, using an electric field to achieve partial erasing will make the production process of the handwriting tablet more complicated and the cost will be extremely high. The influence of the magnetic field on the liquid crystal material is weak, and it is not realistic to use a magnetic field to directly act on the liquid crystal material to achieve partial erasing

[0003] Partial erasing of liquid crystal handwriting boards has been a technical problem that has been difficult to solve in this field for a long time. The patentee is Shenzhen Weiku Optoelectronics Co., Ltd. and the application number is CN201620117008.0. The Chinese utility model patent discloses a semiconductor thermal eraser In addition technology, a semiconductor block is used to heat the liquid crystal to an isotropic liquid, and after cooling, the liquid crystal exists stably in a weakly scattering multi-domain structure, thus realizing the transition from the planar reflection state to the focal conic scattering state, that is, writing erasure However, the heat transfer rate of the semiconductor is slow, and there are problems of burn hazard and high energy consumption. In addition, this method limits the actual temperature range of the liquid crystal tablet, accelerates the aging of the film material and liquid crystal material of the tablet, and seriously affects Lifespan of the LCD handwriting tablet

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