Blackboard writing projection system based on electric-control glass and used for teaching

Abstract

The invention discloses a blackboard writing projection system based on electric-control glass and used for teaching. The blackboard writing projection system comprises a blackboard writing projection board (1), a background mechanism and a projector (2), the projection mechanism is positioned on the rear side of the blackboard writing projection board (1) and is close to the blackboard writing projection board (1), the blackboard writing projection board (1) is made by a transparent material, the background mechanism comprises a fixed black background board (3) and a projection screen board (4), the projection screen board (4) is positioned between the fixed black background board (3) and the blackboard writing projection board (1) and is electric-control liquid crystal photochromic glass which is transparent when being electrified and white when being powered off, and the projector (2) projects on the electric-control liquid crystal photochromic glass which is powered off during projection. By the blackboard writing projection system, effective writing area can be increased, and projection position can be changed by changing position of the electric-control liquid crystal photochromic glass or power-off area, so that people from different angles can see projection content clearly.

Description

technical field [0001] The invention relates to the field of teaching appliances, in particular to a blackboard writing projection system for teaching based on electric control glass. Background technique [0002] The blackboard used for teaching blackboard writing is indispensable in the classroom. For modern teaching, multimedia projection is naturally indispensable. Many classrooms use teaching equipment combining blackboards and projection screens, which not only meet the needs of teachers for blackboard writing, but also use projection equipment for projection teaching. In the prior art, the projection equipment includes a projector and a projection screen. The projection screen and the blackboard are generally installed on the wall in front of the classroom. However, due to the limited area of ​​the wall, the projection screen and the blackboard often overlap. Therefore, there are following technical problems in the blackboard projection equipment of the prior art: ...

AI Technical Summary

Problems solved by technology

[0007] In view of this, the present invention aims at the problems existing in the above-mentioned prior art that the blackboard and the projection screen overlap to reduce the effective writing area, etc., and provides a teaching blackboard writing projection system based on electronically controlled glass with large effective writing area and adjustable projection position

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