Power-driven glass based blackboard writing projection system

Abstract

The invention discloses a power-driven glass based blackboard writing projection system. The power-driven glass based blackboard writing projection system comprises a blackboard writing projection panel (1), a background mechanism and a projector (2), wherein the background mechanism is arranged on the rear side of the blackboard writing projection panel (1) and is in close contact with the blackboard writing projection panel (1), the blackboard writing projection panel (1) is made of a transparent material, the background mechanism comprises a fixed black background plate (3) and a projection screen plate (4), the projection screen plate (4) is arranged between the fixed black background plate (3) and the blackboard writing projection panel (1) and is power-driven liquid crystal photochromic glass, the power-driven liquid crystal photochromic glass is in a transparent state when energized and is in a white color when power is off, and the projector (2) is projected on the power-off power-driven liquid crystal photochromic glass during projection. By the power-driven glass based blackboard writing projection system, the effective writing area can be expanded, the projection position can be changed by chancing the position or a power-off region of the power-driven liquid crystal photochromic glass, and people at different angles can see projection content clearly.

Description

[0001] This application is a divisional application with application number 201410727112.7, application date December 3, 2014, and invention name "Electrically Controlled Glass-Based Teaching Blackboard Projection System". technical field [0002] The invention relates to the field of teaching appliances, in particular to a blackboard writing projection system based on electric control glass. Background technique [0003] 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. Ho...

AI Technical Summary

Problems solved by technology

[0008] 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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