CN104345539A - Control method of teaching blackboard writing projection system - Google Patents
Control method of teaching blackboard writing projection system Download PDFInfo
- Publication number
- CN104345539A CN104345539A CN201410727053.3A CN201410727053A CN104345539A CN 104345539 A CN104345539 A CN 104345539A CN 201410727053 A CN201410727053 A CN 201410727053A CN 104345539 A CN104345539 A CN 104345539A
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- projection
- liquid crystal
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- projector
- writing
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/132—Overhead projectors, i.e. capable of projecting hand-writing or drawing during action
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B5/00—Electrically-operated educational appliances
- G09B5/02—Electrically-operated educational appliances with visual presentation of the material to be studied, e.g. using film strip
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Business, Economics & Management (AREA)
- Educational Administration (AREA)
- Educational Technology (AREA)
- Theoretical Computer Science (AREA)
- Drawing Aids And Blackboards (AREA)
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
The present invention relates to teaching aid control field, specifically a kind of control method of teaching board book optical projection system.
Background technology
Blackboard for instructor's writing on the blackboard is that classroom institute is requisite, and for modern teaching, multimedia overhead projector also seems indispensable naturally.All have employed the teaching equipment that blackboard is combined with projection screen in a lot of classroom, the demand of teacher's writing on the blackboard should be met, projector equipment can be utilized again to carry out projection teaching.In prior art, projector equipment comprises projector and projection screen, projection screen and blackboard generally with on the body of wall being located at before classroom, but due to wall area limited, often there is overlapping part in projection screen and blackboard.Therefore there is following technical matters in the writing on the blackboard projector equipment of prior art:
1, projection screen and blackboard overlapping portion branch shield portions blackboard, some projection screens have even covered almost half blackboard, greatly reduce effective write area of blackboard;
2, the installation site of prior art projection screen is changeless, if projection screen is arranged on the left side in classroom, right side classmate's association is affected, and in like manner, if projection screen is arranged on the right side in classroom, the classmate's association in left side is subject to certain impact.If projection screen is arranged in the middle of classroom, not only can affect the viewing of both sides classmate, also can affect teacher's writing on the blackboard;
3, in order to increase effective write area of blackboard, needing at school, projector to be turned off, projection screen is risen, needing projection once more to fall, not only bother, and waste time in classroom;
4, after writing on whole blackboard, if desired multimedia projector is assisted, and now projection screen can block blackboard part chalk writing, causes certain inconvenience, to again use these chalk writings, needing again projector to turn off, being risen by projection screen.
Summary of the invention
In view of this, the present invention is directed to the blackboard that above-mentioned prior art exists and overlappingly with projection screen reduce the problems such as effective write area, provide the control method of the teaching board book optical projection system that a kind of effective write area is large, projected position is adjustable.
Technical solution of the present invention is, a kind of control method of teaching board book optical projection system of following structure is provided, based on teaching board book optical projection system, described teaching board book optical projection system comprises writing on the blackboard projection plate, background mechanism and projector, described background mechanism is positioned at the rear side of writing on the blackboard projection plate and presses close to mutually with it, described writing on the blackboard projection plate is made up of transparent material, described background mechanism comprises fixed black background board and projection screen plate, described projection screen plate is between black background plate and writing on the blackboard projection plate, projection screen plate is electrically-controlled liquid crystal photo chromic glass, electrically-controlled liquid crystal photo chromic glass is transparent shape when being energized, then in white during power-off,
Described control method comprises the following steps:
Under projection state: the electrically-controlled liquid crystal photo chromic glass power-off of homolographic projection position on projection screen plate, form the view field of white, open projector, by projector lens, image is projected to the view field of white through writing on the blackboard projection plate;
Under non-projection state: to whole projection screen plate break-make, the transparent shape of projection screen plate, fixed black background board is completely as the background of writing on the blackboard projection plate, and now projector does not work.
Adopt above method, the present invention compared with prior art, have the following advantages: adopt the present invention, because background mechanism is close on the writing on the blackboard projection plate be made up of transparent material, background when fixed black background board uses as writing on the blackboard, in the respective regions writing on the blackboard of writing on the blackboard projection plate, its black background can allow the people paid attention to the class see the content of writing on the blackboard clearly, and in white during the power-off of electrically-controlled liquid crystal photo chromic glass, background when using as projection, project on this region, the content of display projection can be known, then to its energising during without the need to projecting, make its transparent shape, now fixed black background board is thereafter just all as the background of writing on the blackboard projection plate.The present invention can increase effective write area, can change the position of electrically-controlled liquid crystal photo chromic glass or outage area to change projected position, make the content seeing projection per capita clearly of different angles.
As preferably, the area of described projection screen plate is corresponding with the drop shadow spread of projector, left and right is slidably to change projected position under the driving of driving mechanism for projection screen plate, and projector also converts projecting direction thereupon, the electrically-controlled liquid crystal photo chromic glass under making drop shadow spread aim at off-position.By regulating the position of projection screen plate, suitable projected position can be selected to meet user demand.
As preferably, described driving mechanism comprises lead screw motor and screw mandrel, and the output shaft of described lead screw motor is connected with screw mandrel, and described projection screen sleeve-board is located on screw mandrel, and lead screw motor is rotated to drive projection screen plate to move.By lead screw motor and screw mandrel, the rotation of motor is converted into the movement of projection screen plate, is convenient to the position adjustments of projection screen plate.
As preferably, described projector is installed on rail plate, and during adjustment projected position, make lead screw motor drive projection screen to slide, projector slides on rail plate simultaneously, remains that projector is on projection screen.Be convenient to regulate projected position as required.
As preferably, described projection screen plate is provided with light activated element, and described projector is provided with the lasing light emitter matched with light activated element, and described light activated element is electrically connected with lead screw motor and electrically-controlled liquid crystal photo chromic glass respectively.During adjustment projected position, projector slides along rail plate, and lasing light emitter touches light activated element, controls lead screw motor and moves, remain lasing light emitter alignment light photosensitive elements by light activated element.
As preferably, described electrically-controlled liquid crystal photo chromic glass is formed by connecting by polylith liquid crystal color-changing glass plate, every block liquid crystal color-changing glass plate is powered by corresponding circuit, to the corresponding liquid crystal color-changing glass plate power-off of projected position to form view field, described projector is in described view field.Select projected position as required, just can form the view field of white to the power-off of this projected position corresponding liquid crystal color-changing glass plate, be convenient to adjustment and the conversion of projected position.
As preferably, described polylith liquid crystal color-changing glass plate is provided with light activated element, and described projector is provided with the lasing light emitter matched with light activated element, and the feed circuit of described light activated element liquid crystal color-changing glass plate corresponding to it connect.During adjustment projected position, projector slides along rail plate, and lasing light emitter touches the corresponding light photosensitive elements of liquid crystal color-changing glass plate, then the some liquid crystal color-changing glass plates power-off near this liquid crystal color-changing glass plate, forms new view field.
As preferably, the projection lens of projector is provided with lens cap, when suspending projection or terminate projection, block projection lens with lens cap, lasing light emitter touches light activated element, is controlled to be energized to the electrically-controlled liquid crystal photo chromic glass of power-off by light activated element.Doing so avoids the worry of prior art folding and unfolding projection screen, former view field just becomes the region can writing writing on the blackboard, effectively utilizes the write area of writing on the blackboard projection plate.
As preferably, when starting projection or continuing projection, open lens cap, touch light activated element by lasing light emitter, light activated element controls electrically-controlled liquid crystal photo chromic glass homolographic projection region power-off.Be convenient to suspend projection switch with the operating mode continuing to project.
As preferably, described in make writing on the blackboard projection plate transparent material can realize the diffuse reflection of light.So that the spectators of different angles can see the content of writing on the blackboard and projection clearly.
Accompanying drawing explanation
Fig. 1 is the structural representation (the first state) of teaching board book optical projection system embodiment 1;
Fig. 2 is the structural representation (the second state) of teaching board book optical projection system embodiment 1;
Fig. 3 is the structural representation (the first state) of teaching board book optical projection system embodiment 2;
Fig. 4 is the structural representation (the second state) of teaching board book optical projection system embodiment 2;
Fig. 5 is the structural representation of projector and rail plate;
As shown in the figure, 1, writing on the blackboard projection plate, 2, projector, 2.1, projection lens, 2.2, lens cap, 3, fixed black background board, 4, projection screen plate, 4.1, screw mandrel, 4.2, liquid crystal color-changing glass plate, 5, rail plate, 6, light activated element, 7, lasing light emitter.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described, but the present invention is not restricted to these embodiments.
The present invention contain any make on marrow of the present invention and scope substitute, amendment, equivalent method and scheme.To have the present invention to make the public and understand thoroughly, in the following preferred embodiment of the present invention, describe concrete details in detail, and do not have the description of these details also can understand the present invention completely for a person skilled in the art.In addition, the needs in order to illustrate in the accompanying drawing of the present invention, completely accurately do not draw according to actual ratio, are explained at this.
As Fig. 1, shown in 2 and 5, the control method of a kind of teaching board book optical projection system of the present invention, based on teaching board book optical projection system, described teaching board book optical projection system comprises 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 between fixed black background board 3 and writing on the blackboard projection plate 1, projection screen plate 4 is electrically-controlled liquid crystal photo chromic glass, electrically-controlled liquid crystal photo chromic glass is transparent shape when being energized, then in white during power-off,
Described control method comprises the following steps:
Under projection state: the electrically-controlled liquid crystal photo chromic glass power-off of homolographic projection position on projection screen plate, form the view field of white, open projector, by projector lens, image is projected to the view field of white through writing on the blackboard projection plate;
Under non-projection state: to whole projection screen plate break-make, the transparent shape of projection screen plate, fixed black background board is completely as the background of writing on the blackboard projection plate, and now projector does not work.
It is to be noted that " transparent " of " described writing on the blackboard projection plate 1 is made up of transparent material " is nisi transparent, comprise the states such as translucent, with spectators through seeing font clearly for requiring, its transparency is set, such as after frosted, its transparency can reduce, and the diffuse reflection after frosted can make human eye see more clearly.
Electrically-controlled liquid crystal photo chromic glass is also electronic-control dimming glass, by the mode of liquid crystal film by High Temperature High Pressure, the high-tech photoelectric glass product of sandwich package, whether user can control the arrangement of liquid crystal molecule by the energising of electric current, thus reaches the final purpose controlling glass transparent and opaque state.Liquid crystal molecule is arranged in a linear in the energized state, at this moment liquid-crystalline glasses printing opacity and transparent; During off-position, liquid crystal molecule is scattering state and in white, at this time liquid crystal film printing opacity but opaque.
The present invention lists two embodiments, as illustrated in fig. 1 and 2, illustrates the structure of embodiment 1, Fig. 1 be projection screen plate in power-off projection state, Fig. 2 is projection screen plate in energising pellucidity.The area of described projection screen plate 4 is corresponding with the drop shadow spread of projector 2, projection screen plate 4 under the driving of driving mechanism left and right slidably to change projected position, projector 2 also converts projecting direction thereupon, the electrically-controlled liquid crystal photo chromic glass under making drop shadow spread aim at off-position.
It is (clear in order to illustrate that described driving mechanism comprises lead screw motor, lead screw motor shows in the drawings) and screw mandrel 4.1, the output shaft of described lead screw motor is connected with screw mandrel 4.1, described projection screen plate 4 is sheathed on screw mandrel 4.1, and lead screw motor is rotated to drive projection screen plate 4 to move.
Described projector 2 is installed on rail plate 5, and during adjustment projected position, make lead screw motor drive projection screen 4 to slide, projector 2 slides on rail plate 5 simultaneously, remains that projector 2 is projected on projection screen 4.Projector 2 slides under the driving of stepper motor on rail plate 5.
Described projection screen plate 4 is provided with light activated element 6, and described projector 2 is provided with the lasing light emitter 7 matched with light activated element 6, and described light activated element 6 is electrically connected with lead screw motor and electrically-controlled liquid crystal photo chromic glass respectively.During adjustment projected position, projector slides along rail plate, and lasing light emitter touches light activated element, controls lead screw motor and moves, remain lasing light emitter alignment light photosensitive elements by light activated element.
As shown in Figures 3 and 4, illustrate the structure of embodiment 2, Fig. 3 be projection screen plate in power-off projection state, Fig. 4 is projection screen plate in energising pellucidity.Embodiment 2 is from the different of embodiment 1, and embodiment 2 without the need to mobile projector curtain plate, but realizes the adjustment of projected position when changing projected position by the region of power on/off.Embodiment 1 can only be made up of one piece of electrically-controlled liquid crystal photo chromic glass suitable with drop shadow spread, and embodiment 2 is then made up of polylith liquid crystal color-changing glass plate, and its area combined and writing on the blackboard projection plate, fixed black background board are suitable.The concrete structure of embodiment 2 is as follows:
Described electrically-controlled liquid crystal photo chromic glass is formed by connecting by polylith liquid crystal color-changing glass plate 4.2, every block liquid crystal color-changing glass plate 4.2 is powered by corresponding circuit, to corresponding liquid crystal color-changing glass plate 4.2 power-off of projected position to form view field, described projector 2 is projected on described view field.
Described polylith liquid crystal color-changing glass plate 4.2 is provided with light activated element 6 (can be arranged to one_to_one corresponding, also can arrange selectively), 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 4.2 corresponding to it connect.During adjustment projected position, projector slides along rail plate, lasing light emitter touches the corresponding light photosensitive elements of liquid crystal color-changing glass plate, some liquid crystal color-changing glass plates power-off (centered by that liquid crystal color-changing glass plate that lasing light emitter is aimed at) then near this liquid crystal color-changing glass plate, forms new view field.
As shown in Figure 5, also there is other common technical feature in embodiment 1 and 2: on the projection lens of projector 2, is 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;
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.
The described transparent material making writing on the blackboard projection plate 1 can realize the diffuse reflection of light.
" lens cap blocks projection lens " easy to use just in order in classroom or teaching process, does not close the power supply of projector, also needs to close projector power supply after end.
Color due to the white letter written with chalk on writing on the blackboard projection plate is white, consistent with white background, therefore on writing on the blackboard projection plate, the white chalk of optional position does not all affect drop shadow effect, when namely projecting, do not need the white letter written with chalk wiping view field, after projection disappears, white letter written with chalk can continue to use.
The present invention also has the advantage that prior art does not have: adopt ground glass or frosted organic glass under dampness, do not affect the writing effect of chalk, wet towel therefore can be used to regard blackboard eraser, avoid the infringement of dust to user lung.
Below only just preferred embodiment of the present invention is described, but can not be interpreted as it is limitations on claims.The present invention is not only confined to above embodiment, and its concrete structure allows to change.In a word, all various changes done in the protection domain of independent claims of the present invention are all in protection scope of the present invention.
Claims (10)
1. the control method of a teaching board book optical projection system, based on teaching board book optical projection system, it is characterized in that: described teaching board book optical projection system comprises 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 electrically-controlled liquid crystal photo chromic glass, electrically-controlled liquid crystal photo chromic glass is transparent shape when being energized, then in white during power-off,
Described control method comprises the following steps:
Under projection state: the electrically-controlled liquid crystal photo chromic glass power-off of homolographic projection position on projection screen plate, form the view field of white, open projector, by projector lens, image is projected to the view field of white through writing on the blackboard projection plate;
Under non-projection state: to whole projection screen plate break-make, the transparent shape of projection screen plate, fixed black background board is completely as the background of writing on the blackboard projection plate, and now projector does not work.
2. the control method of teaching board book optical projection system according to claim 1, it is characterized in that: the area of described projection screen plate (4) is corresponding with the drop shadow spread of projector (2), projection screen plate (4) under the driving of driving mechanism left and right slidably to change projected position, projector (2) also converts projecting direction thereupon, the electrically-controlled liquid crystal photo chromic glass under making drop shadow spread aim at off-position.
3. the control method of teaching board book optical projection system according to claim 2, it is characterized in that: described driving mechanism comprises lead screw motor and screw mandrel (4.1), the output shaft of described lead screw motor is connected with screw mandrel (4.1), described projection screen plate (4) is sheathed on screw mandrel (4.1), and lead screw motor rotates to drive projection screen plate (4) mobile.
4. the control method of teaching board book optical projection system according to claim 3, it is characterized in that: described projector (2) is installed on rail plate (5), during adjustment projected position, lead screw motor is made to drive projection screen (4) to slide, projector (2) is in the upper slip of rail plate (5) simultaneously, remains that projector (2) is projected on projection screen (4).
5. teaching board book optical projection system according to claim 2, it is characterized in that: described projection screen plate (4) 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 described light activated element (6) is electrically connected with lead screw motor and electrically-controlled liquid crystal photo chromic glass respectively.
6. the control method of teaching board book optical projection system according to claim 1, it is characterized in that: described electrically-controlled liquid crystal photo chromic glass is formed by connecting by polylith liquid crystal color-changing glass plate (4.2), every block liquid crystal color-changing glass plate (4.2) is powered by corresponding circuit, to corresponding liquid crystal color-changing glass plate (4.2) power-off of projected position to form view field, described projector (2) is projected on described view field.
7. the control method of teaching board book optical projection system according to claim 6, it is characterized in that: described polylith liquid crystal color-changing glass plate (4.2) 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 (4.2) corresponding to it connect.
8. the control method of the teaching board book optical projection system according to claim 1 or 2 or 6, 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).
9. the control method of the teaching board book optical projection system according to claim 1 or 2 or 6, 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.
10. the control method of the teaching board book optical projection system according to claim 1 or 2 or 6, is characterized in that: described in make writing on the blackboard projection plate (1) transparent material can realize the diffuse reflection of light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410727053.3A CN104345539B (en) | 2014-12-03 | 2014-12-03 | The control method of teaching board book optical projection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410727053.3A CN104345539B (en) | 2014-12-03 | 2014-12-03 | The control method of teaching board book optical projection system |
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| Publication Number | Publication Date |
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| CN104345539A true CN104345539A (en) | 2015-02-11 |
| CN104345539B CN104345539B (en) | 2016-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410727053.3A Expired - Fee Related CN104345539B (en) | 2014-12-03 | 2014-12-03 | The control method of teaching board book optical projection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CN2710948Y (en) * | 2004-06-25 | 2005-07-20 | 邓玉阁 | Automatic color-changing glass wind-screen of automobile |
| CN200992070Y (en) * | 2006-12-15 | 2007-12-19 | 苗家远 | Liquid crystal projection blackboard |
| CN202911381U (en) * | 2012-12-03 | 2013-05-01 | 佳木斯大学 | Teaching blackboard for higher mathematics |
| CN203786419U (en) * | 2014-04-23 | 2014-08-20 | 量子通信科技股份（香港）有限公司 | Color-changing sunglasses based on liquid crystal |
| CN104129205A (en) * | 2014-07-15 | 2014-11-05 | 浙江工业大学 | Automatic cleaning blackboard |
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- 2014-12-03 CN CN201410727053.3A patent/CN104345539B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2710948Y (en) * | 2004-06-25 | 2005-07-20 | 邓玉阁 | Automatic color-changing glass wind-screen of automobile |
| CN200992070Y (en) * | 2006-12-15 | 2007-12-19 | 苗家远 | Liquid crystal projection blackboard |
| CN202911381U (en) * | 2012-12-03 | 2013-05-01 | 佳木斯大学 | Teaching blackboard for higher mathematics |
| CN203786419U (en) * | 2014-04-23 | 2014-08-20 | 量子通信科技股份（香港）有限公司 | Color-changing sunglasses based on liquid crystal |
| CN104129205A (en) * | 2014-07-15 | 2014-11-05 | 浙江工业大学 | Automatic cleaning blackboard |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| WO2021217736A1 (en) * | 2020-04-29 | 2021-11-04 | 深圳市华星光电半导体显示技术有限公司 | Projection display and projection display apparatus |
| US20230129293A1 (en) * | 2020-04-29 | 2023-04-27 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Projection display device and projection display equipment |
| US11940721B2 (en) * | 2020-04-29 | 2024-03-26 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Projection display device and projection display equipment |
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| Publication number | Publication date |
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| CN104345539B (en) | 2016-11-09 |
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