CN104375369A - Blackboard Projection System for Teaching Based on Electronically Controlled Glass - Google Patents

Abstract

The invention discloses a teaching blackboard writing projection system based on electric control glass, which comprises a blackboard writing projection plate (1), a background mechanism and a projector (2), wherein the background mechanism is positioned at the rear side of the blackboard writing projection plate (1) and is close to the blackboard writing projection plate, the blackboard writing projection plate (1) is made of transparent materials, 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 projection plate (1), the projection screen plate (4) is the electric control liquid crystal color changing glass, the electric control liquid crystal color changing glass is transparent when being electrified and is white when being powered off, and the projector (2) projects on the electric control liquid crystal color changing glass when being powered off. The invention can increase the effective writing area, change the position of the electric control liquid crystal color-changing glass or the power-off area to change the projection position, and ensure that people at different angles can clearly see the projection content.

Description

Blackboard Projection System for Teaching Based on Electronically Controlled Glass

technical field

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

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 the following technical problems in the blackboard projection equipment of the prior art:

1. The overlapping part of the projection screen and the blackboard will cover part of the blackboard, and some projection screens even cover almost half of the blackboard, which greatly reduces the effective writing area of the blackboard;

2. The installation position of the projection screen in the prior art is fixed. If the projection screen is set on the left side of the classroom, the students on the right side will be affected. Similarly, if the projection screen is set on the right side of the classroom, the students on the left side will be affected. will be affected to a certain extent. If the projection screen is set in the middle of the classroom, it will not only affect the viewing of students on both sides, but also affect the teacher's writing on the blackboard;

3. In order to increase the effective writing area of the blackboard, it is necessary to turn off the projector in the middle of the class, raise the projection screen, and then lower the projection again, which is not only troublesome, but also a waste of class time;

4. After writing on the entire blackboard, if you need the assistance of a multimedia projector, the projection screen will cover part of the chalk writing on the blackboard at this time, causing some inconvenience. If you want to use these chalk writing again, you need to turn off the projector. The projection screen rises.

Contents of the invention

In view of this, the present invention provides a teaching blackboard writing projection system based on electronically controlled glass with large effective writing area and adjustable projection position, aiming at the problems of overlapping blackboard and projection screen and reducing effective writing area in the prior art.

The technical solution of the present invention is to provide a teaching blackboard projection system based on electronically controlled glass with the following structure, including a blackboard projection board, a background mechanism and a projector, and the background mechanism is located at the rear side of the blackboard projection board and connected with it Closely, the blackboard projection board is made of transparent material, and the background mechanism includes a fixed black background board and a projection screen, and the projection screen is located between the black background board and the blackboard projection board, and the projection screen is composed of A plurality of electronically controlled liquid crystal color-changing glass plates are connected. The electronically controlled liquid crystal color-changing glass plate is transparent when it is powered on, and it is white when it is powered off. Each liquid crystal color-changing glass plate is powered by a corresponding circuit. The liquid crystal color-changing glass plate is powered off to form a projection area, and the projector is projected on the projection area.

With the above structure, compared with the prior art, the present invention has the following advantages: by adopting the present invention, since the background mechanism is close to the blackboard writing projection board made of transparent material, the black background board is fixed as the background of the writing on the blackboard when it is used. The black background of the corresponding area of the projection board allows the listeners to see the content of the blackboard writing clearly, while the electronically controlled liquid crystal color-changing glass turns white when the power is off, and is used as the background for projection. When projected onto this area, the projection can be clearly displayed When there is no need for projection, it is powered on to make it transparent. At this time, the fixed black background board behind it is all used as the background of the blackboard projection board. The invention can increase the effective writing area, and can change the position of the electronically controlled liquid crystal color-changing glass or the power-off area to change the projection position, so that people from different angles can clearly see the projected content.

Preferably, the plurality of liquid crystal color-changing glass plates are provided with photosensitive elements, the projector is provided with a laser source matched with the photosensitive elements, and the photosensitive elements are connected to the power supply circuit of the corresponding liquid crystal color-changing glass plates . When adjusting the projection position, the projector slides along the sliding guide rail, and the laser source touches the corresponding photosensitive element of the liquid crystal color-changing glass plate, and then several liquid crystal color-changing glass plates near the liquid crystal color-changing glass plate are powered off to form a new projection area.

Preferably, a lens cover is provided on the projection lens of the projector, and when the projection is paused or terminated, the lens cover is used to block the projection lens, the laser source touches the photosensitive element, and the photosensitive element controls the energization of the electrically controlled liquid crystal color-changing glass that is powered off. In this way, the annoyance of retracting and placing the projection screen in the prior art is avoided, and the original projection area becomes an area where blackboard writing can be written, effectively utilizing the writing area of the blackboard projection board.

Preferably, when the projection is started or continued, the lens cover is opened, the photosensitive element is touched by the laser source, and the photosensitive element controls the power-off of the corresponding projection area of the electronically controlled liquid crystal color-changing glass. It is convenient to switch between suspending projection and continuing projection.

Preferably, the transparent material used to make the blackboard projection board can realize diffuse reflection of light. So that audiences from different angles can see clearly the contents of the writing on the blackboard and the projection.

Description of drawings

Fig. 1 is a structural representation (first state) of the present invention;

Fig. 2 is a structural representation (second state) of the present invention;

Fig. 3 is a structural schematic diagram of a projector and a sliding guide rail;

As shown in the figure, 1. blackboard projection board, 2. projector, 2.1. projection lens, 2.2. lens cover, 3. fixed black background board, 4. projection screen board, 4.1. liquid crystal color-changing glass board, 5. sliding guide rail , 6, photosensitive element, 7, laser source.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the present invention is not limited to these embodiments.

The present invention covers any alternatives, modifications, equivalent methods and schemes made on the spirit and scope of the present invention. In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, for the sake of illustration, the drawings of the present invention are not completely drawn according to the actual scale, and are described here.

As shown in Figures 1, 2 and 3, a blackboard projection system for teaching based on electronically controlled glass of the present invention includes a blackboard projection board 1, a background mechanism and a projector 2, and the background mechanism is located on the blackboard projection board 1 The rear side and close to it, the blackboard projection board 1 is made of transparent material, the background mechanism includes a fixed black background board 3 and a projection screen 4, and the projection screen 4 is located between the fixed black background board 3 and Between the blackboard projection boards 1, the projection screen board 4 is formed by connecting a plurality of electronically controlled liquid crystal color-changing glass plates. The electronically controlled liquid crystal color-changing glass is transparent when powered on, and white when powered off. Each liquid crystal color-changing glass plate is 4.1 All are powered by corresponding circuits, and the corresponding liquid crystal color-changing glass plate 4.1 at the projection position is powered off to form a projection area, and the projector 2 is projected on the projection area.

Based on the above-mentioned electronically controlled glass-based teaching blackboard projection system, the control method of the electronically controlled glass-based teaching blackboard projection system can be formed. The following structural limitations and usage methods for the electronically controlled glass-based teaching blackboard projection system can be As a further definition of the control method.

It should be noted that the "transparency" of "the blackboard writing projection board 1 is made of transparent material" is not absolutely transparent, including semi-transparent and other states. The transparency is set based on the requirement that the audience can see the characters clearly, for example, in After frosting, its transparency will be reduced, and the diffuse reflection after frosting can make the human eye see more clearly.

Electronically controlled liquid crystal color-changing glass is also called electronically controlled dimming glass. It is a high-tech photoelectric glass product made of liquid crystal film through high temperature and high pressure, interlayer packaging. Users can control the arrangement of liquid crystal molecules by whether the current is energized or not. So as to achieve the ultimate goal of controlling the transparent and opaque state of the glass. The liquid crystal molecules are arranged in a straight line when the power is on, and the liquid crystal glass is light-transmitting and transparent; when the power is off, the liquid crystal molecules are scattered and white, and the liquid crystal film is light-transmitting but opaque.

As shown in Figures 1 and 2, the structures of the present invention in two different states are illustrated respectively. Figure 1 shows the projection screen panel in the power-off projection state, and Figure 2 shows the projection screen panel in the power-on transparent state. details as follows:

The plurality of liquid crystal color-changing glass plates 4.1 are provided with photosensitive elements 6 (can be arranged in one-to-one correspondence, and can also be selectively arranged), and the described projector 2 is provided with a laser source that matches the photosensitive elements 6 7. The photosensitive element 6 is connected to the power supply circuit corresponding to the liquid crystal color-changing glass plate 4.1. When adjusting the projection position, the projector slides along the sliding guide rail, and the laser source touches the corresponding photosensitive element of the liquid crystal color-changing glass plate, then several liquid crystal color-changing glass plates near the liquid crystal color-changing glass plate are powered off (the liquid crystal color-changing glass aligned with the laser source glass plate as the center), forming new projected areas (these features can be used as part of the control method).

As shown in Figure 3, a lens cover 2.1 is provided on the projection lens of the projector 2. When the projection is suspended or terminated, the projection lens is blocked by the lens cover 2.1, and the laser source 7 touches the photosensitive element 6, which is controlled by the photosensitive element 6. The electronically controlled liquid crystal color-changing glass is energized;

When starting to project or continue to project, open the lens cover 2.1, the photosensitive element 6 is touched by the laser source 7, and the photosensitive element 6 controls the power-off of the corresponding projection area of the electronically controlled liquid crystal color-changing glass.

The transparent material used to make the blackboard projection board 1 can realize diffuse reflection of light.

"The lens cover blocks the projection lens" is only for the convenience of use in the classroom or teaching process, and does not turn off the power of the projector. After the end, the power of the projector needs to be turned off.

Since the color of the white chalk characters on the blackboard projection board is white, which is consistent with the white background, the white chalk anywhere on the blackboard projection board will not affect the projection effect, that is, it is not necessary to erase the white chalk characters in the projection area during projection. After the projection disappears, the white chalk characters can continue to be used.

The present invention also has the advantage that the prior art does not have: the use of frosted glass or frosted plexiglass does not affect the writing effect of chalk in a wet state, so a wet towel can be used as a blackboard eraser, avoiding the damage of dust to the user's lungs .

The above is only an illustration of the preferred embodiments of the present invention, but should not be construed as a limitation on the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to vary. In a word, all kinds of changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

Claims (5)

1. the teaching board book optical projection system based on automatically controlled glass, it is characterized in that: comprise writing on the blackboard projection plate (1), background mechanism and projector (2), described background mechanism is positioned at the rear side of writing on the blackboard projection plate (1) and presses close to mutually with it, described writing on the blackboard projection plate (1) is made up of transparent material, described background mechanism comprises fixed black background board (3) and projection screen plate (4), described projection screen plate (4) is positioned between fixed black background board (3) and writing on the blackboard projection plate (1), projection screen plate (4) is formed by connecting by polylith electrically-controlled liquid crystal photo chromic glass plate (4.1), electrically-controlled liquid crystal photo chromic glass is transparent shape when being energized, then in white during power-off, electrically-controlled liquid crystal photo chromic glass is transparent shape when being energized, then in white during power-off, every block liquid crystal color-changing glass plate (4.1) is powered by corresponding circuit, to corresponding liquid crystal color-changing glass plate (4.1) power-off of projected position to form view field, described projector (2) is projected on described view field.

2. the teaching board book optical projection system based on automatically controlled glass according to claim 1, it is characterized in that: described polylith liquid crystal color-changing glass plate (4.1) is provided with light activated element (6), described projector (2) is provided with the lasing light emitter (7) matched with light activated element (6), and the feed circuit of described light activated element (6) liquid crystal color-changing glass plate (4.1) corresponding to it connect.

3. the teaching board book optical projection system based on automatically controlled glass according to claim 1 and 2, it is characterized in that: on the projection lens of projector (2), be provided with lens cap (2.1), when suspending projection or terminate projection, projection lens is blocked with lens cap (2.1), lasing light emitter (7) touches light activated element (6), is controlled to be energized to the electrically-controlled liquid crystal photo chromic glass of power-off by light activated element (6).

4. according to claim 1 or 2 based on automatically controlled glass teaching board book optical projection system, it is characterized in that: when starting projection or continuing projection, open lens cap (2.1), touch light activated element (6) by lasing light emitter (7), light activated element (6) controls electrically-controlled liquid crystal photo chromic glass homolographic projection region power-off.

5. the teaching board book optical projection system based on automatically controlled glass according to claim 1 and 2, is characterized in that: described in make writing on the blackboard projection plate (1) transparent material can realize the diffuse reflection of light.