CN200992070Y - Liquid crystal projection blackboard - Google Patents
Liquid crystal projection blackboard Download PDFInfo
- Publication number
- CN200992070Y CN200992070Y CN 200620166273 CN200620166273U CN200992070Y CN 200992070 Y CN200992070 Y CN 200992070Y CN 200620166273 CN200620166273 CN 200620166273 CN 200620166273 U CN200620166273 U CN 200620166273U CN 200992070 Y CN200992070 Y CN 200992070Y
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- CN
- China
- Prior art keywords
- blackboard
- liquid crystal
- control circuit
- glass
- conductive glass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
Disclosed is a liquid crystal projection blackboard, which belongs to the technical field of teaching appliance, and comprises a ground glass blackboard and a control circuit. The ground glass blackboard is composed of two layers of conducting glass and an occlusion layer made of the novel solidification liquid crystal display material that is sandwiched between the two layers of the conducting glass. The end of the voltage output of the control circuit is connected on the two layers of the conducting glass. The utility model has the beneficial effects of reasonable design, simple structure and convenient manufacture; the blackboard can be used for writing and used as the screen of the projector without cleaning the words on the blackboard, thus the utility model is very convenient to operate.
Description
One, technical field
The utility model relates to a kind of blackboard, relates in particular to a kind of crystal projection blackboard.
Two, background technology
In the multi-media classroom, the shadow cloth of projecting apparatus is suspended on the top of blackboard usually, shadow cloth need be fallen in the time of projection now.At this moment, shadow cloth blocks blackboard, and the area that can't write on blackboard or write is very little.If shadow cloth is pulled on, write word and put down again, need to wait for the folding and unfolding of shadow cloth, lose time very much.
Three, summary of the invention
The utility model provides a kind of reasonable in design, simple in structure at deficiency of the prior art, can be used for the crystal projection blackboard of projection.
The utility model adopts following technical proposals:
A kind of crystal projection blackboard, comprise frosted glass blackboard and control circuit, the frosted glass blackboard is made of two-layer electro-conductive glass and the barrier bed that is clipped in the novel liquid crystal display material of the curing between the two-layer electro-conductive glass, and substrate is a white, and the voltage of control circuit output is connected on the two-layer electro-conductive glass.
Described crystal projection blackboard, control circuit is made up of power switch and transformer, and civil power is connected the input of transformer by power switch, and the transformer output is connected on the two-layer electro-conductive glass.
Used liquid crystal display material is the liquid crystal material that macromolecule heterogeneous disperses, and is opaque during outage, transparent during energising, perhaps opposite.This liquid crystal display material is scattered beam (opaque) in the normal state, and has an X-rayed phenomenon (transparent) because the variation of Liquid Crystal Molecules Alignment presents under electric field action.Perhaps opposite---transparent in the normal state, opaque under electric field action, promptly have just to show and the anti-two states that shows.If blackboard is through being usually used in projection, with the anti-state that shows; If write through being usually used in, the available state that just showing is to save electric energy.
In above technical scheme, liquid crystal is become solid-state by liquid state, can be made on glass or the film.After connecting power supply, transformer is a safe voltage with the urban network electricity pressure drop, and under effect of electric field that electro-conductive glass applies, the liquid crystal molecule variation that is distorted realizes the conversion between transparent and opaque.
Be easily, after blackboard writes, if be used for projection, only need twist switch, it is transparent that liquid crystal material is become, because word and substrate all are white, can wipe word and can directly be used for projection, after projection finishes, can follow the former content that is kept and continue to write.
Compared with prior art, the beneficial effects of the utility model are: reasonable in design, simple in structure, be easy to make; This blackboard both can write, and can be used as the shadow cloth of projecting apparatus again, and need not wipe the word of being write, and was very easy to use.
Four, description of drawings
Fig. 1 is the electrical block diagram of the utility model crystal projection blackboard;
Wherein, 1, the frosted glass blackboard, 2, electro-conductive glass, 3, barrier material, A, power switch, B, transformer.
Five, the specific embodiment
The utility model will be further described below in conjunction with accompanying drawing.
Embodiment:
As shown in Figure 1, crystal projection blackboard of the present utility model, comprise frosted glass blackboard 1 and control circuit, frosted glass blackboard 1 is made of two-layer electro-conductive glass 2 and the barrier bed 3 that is clipped in the novel liquid crystal display material of the curing between the two-layer electro-conductive glass 2, substrate is a white, and the safe voltage of control circuit output is connected on the two-layer electro-conductive glass 2.
Control circuit is made up of power switch A and transformer B, and civil power is connected the input of transformer B by power switch A, the alternating voltage of transformer B output 20V, and its output is connected on the two-layer electro-conductive glass 2.
Claims (2)
1, a kind of crystal projection blackboard, it is characterized in that, comprise frosted glass blackboard and control circuit, the frosted glass blackboard is made of two-layer electro-conductive glass and the barrier bed that is clipped in the novel liquid crystal display material of the curing between the two-layer electro-conductive glass, and the voltage output end of control circuit is connected with electro-conductive glass.
2, crystal projection blackboard as claimed in claim 1 is characterized in that, control circuit is made up of power switch and transformer, and civil power is connected with the input of transformer by power switch, and the transformer output is connected with electro-conductive glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620166273 CN200992070Y (en) | 2006-12-15 | 2006-12-15 | Liquid crystal projection blackboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620166273 CN200992070Y (en) | 2006-12-15 | 2006-12-15 | Liquid crystal projection blackboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200992070Y true CN200992070Y (en) | 2007-12-19 |
Family
ID=38945146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620166273 Expired - Fee Related CN200992070Y (en) | 2006-12-15 | 2006-12-15 | Liquid crystal projection blackboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200992070Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330950A (en) * | 2014-12-03 | 2015-02-04 | 中国计量学院 | Blackboard-writing projecting system for teaching |
| CN104345539A (en) * | 2014-12-03 | 2015-02-11 | 中国计量学院 | Control method of teaching blackboard writing projection system |
| CN104375369A (en) * | 2014-12-03 | 2015-02-25 | 中国计量学院 | Blackboard writing projection system based on electric-control glass and used for teaching |
| CN105785697A (en) * | 2014-12-03 | 2016-07-20 | 中国计量学院 | Power-driven glass based blackboard writing projection system |
| CN111427228A (en) * | 2020-04-29 | 2020-07-17 | 深圳市华星光电半导体显示技术有限公司 | Projection display and projection display device |
| CN111487831A (en) * | 2020-06-11 | 2020-08-04 | 江西沃格光电股份有限公司 | Electrochromic projection screen, projection curtain wall and projection equipment |
-
2006
- 2006-12-15 CN CN 200620166273 patent/CN200992070Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330950A (en) * | 2014-12-03 | 2015-02-04 | 中国计量学院 | Blackboard-writing projecting system for teaching |
| CN104345539A (en) * | 2014-12-03 | 2015-02-11 | 中国计量学院 | Control method of teaching blackboard writing projection system |
| CN104375369A (en) * | 2014-12-03 | 2015-02-25 | 中国计量学院 | Blackboard writing projection system based on electric-control glass and used for teaching |
| CN105549316A (en) * | 2014-12-03 | 2016-05-04 | 中国计量学院 | Power-driven glass based blackboard writing projection method for teaching |
| CN105785697A (en) * | 2014-12-03 | 2016-07-20 | 中国计量学院 | Power-driven glass based blackboard writing projection system |
| CN105549316B (en) * | 2014-12-03 | 2017-08-11 | 中国计量学院 | Teaching board book projecting method based on automatically controlled glass |
| CN105785697B (en) * | 2014-12-03 | 2017-08-25 | 中国计量学院 | Writing on the blackboard optical projection system based on automatically controlled glass |
| CN111427228A (en) * | 2020-04-29 | 2020-07-17 | 深圳市华星光电半导体显示技术有限公司 | Projection display and projection display device |
| CN111487831A (en) * | 2020-06-11 | 2020-08-04 | 江西沃格光电股份有限公司 | Electrochromic projection screen, projection curtain wall and projection equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |