Blackboard projection system for teaching

Abstract

The invention discloses a blackboard-writing projecting system for teaching. The blackboard-writing projecting system comprises a blackboard-writing projecting plate (1), a background mechanism and a projector (2), wherein the background mechanism is positioned at the rear side of the blackboard-writing projecting plate (1) and is close to the blackboard-writing projecting plate (1), the blackboard-writing projecting plate (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 positioned between the fixed black background plate (3) and the blackboard-writing projecting plate (1), the projection screen plate (4) is made of electronically-controlled liquid crystal photochromic glass, the electronically-controlled liquid crystal photochromic glass is transparent when being electrified, and is white when being in power failure, and the projector (2) projects on the electronically-controlled liquid crystal photochromic glass in power failure when projecting. According to the blackboard-writing projecting system, the writing area can be effectively increased, and a projection position can be changed by changing a position of the electronically-controlled liquid crystal photochromic glass or a power failure region, so that persons in different angles can see projected contents clearly.

Description

technical field [0001] The invention relates to the field of teaching appliances, in particular to a blackboard writing projection system for teaching. 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: [0003] 1. The overlapping part ...

AI Technical Summary

Problems solved by technology

[0007] In view of this, the present invention provides a blackboard writing projection system for teaching with large effective writing area and adjustable projection position, aiming at the problems existing in the above-mentioned prior art that the blackboard overlaps with the projection screen to reduce the effective writing area.

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