Control method of teaching blackboard writing projection system

Abstract

The invention discloses a control method of a teaching blackboard writing projection system. The teaching blackboard writing projection system comprises a backboard writing projection board (1), a background mechanism and a projector (2), wherein the background mechanism is positioned at the back side of the backboard writing projection board (1) and is arranged near the backboard writing projection board (1), the backboard writing projection board (1) is made of transparent material, the background mechanism comprises a fixed black background board (3) and a projection curtain board (4), the projection curtain board (4) is positioned between the fixed black background board (3) and the backboard writing projection board (1), the projection curtain board (4) is made of electrically-controlled liquid crystal coloring glass, the electrically-controlled liquid crystal coloring glass is transparent in the energizing process, and is white in the deenergizing process, and the projector (2) is used for projecting onto the deenergized electrically-controlled liquid crystal coloring glass in the projection process. The teaching blackboard writing projection system has the advantages that the effective writing area is increased, the projection position is changed by changing the electrically-controlled liquid crystal coloring glass area or the deenergizing area, and people at different directions can clearly watch the project content.

Description

technical field [0001] The invention relates to the field of teaching appliance control, in particular to a control method of 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: [000...

AI Technical Summary

Problems solved by technology

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

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