CN208819014U - Projection screen and optical projection system - Google Patents
Projection screen and optical projection system Download PDFInfo
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- CN208819014U CN208819014U CN201821814552.6U CN201821814552U CN208819014U CN 208819014 U CN208819014 U CN 208819014U CN 201821814552 U CN201821814552 U CN 201821814552U CN 208819014 U CN208819014 U CN 208819014U
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Abstract
Projection screen provided by the utility model and optical projection system, are related to projection art.Wherein, the projection screen includes: substrate layer；It is made in the laminated imaging layer of the substrate；It is made in the imaging layer reflexed light film laminated far from the substrate.The reflexed light film includes the first film layer and has the second film layer of different refractivity with first film layer, so that the reflexed light film can reflect the light of redgreenblue, and absorbs the light of other colors other than redgreenblue.By above-mentioned setting, the poor problem of imaging effect existing for existing projection screen can be improved.
Description
Technical field
The utility model relates to projection arts, in particular to a kind of projection screen and optical projection system.
Background technique
With the continuous development of screen display technology, projection obtains extensive as a kind of simple, convenient and fast display mode
Application, for example, the entertainment of family or office demand.Wherein, when being shown by projection, indispensable one
Equipment is exactly projection screen.Also, imaging layer plays important as a key structure of imaging display in projection screen
Effect.
Through inventor the study found that in existing projection screen, it is incident in the light beam of imaging layer in addition to projector is defeated
Light beam out further includes the light beam issued in the environment where projection screen there are other light sources or natural light.Wherein, the light beam
Or natural light mixed with the light beam that projector exports after will lead to the poor problem of imaging effect.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of projection screen and optical projection system, it is existing to improve
The poor problem of imaging effect existing for projection screen.
To achieve the above object, the utility model embodiment adopts the following technical scheme that
A kind of projection screen, comprising:
Substrate layer；
It is made in the laminated imaging layer of the substrate；
It is made in the imaging layer reflexed light film laminated far from the substrate；
Wherein, the reflexed light film includes the first film layer and has the second film layer of different refractivity with first film layer,
So that the reflexed light film can reflect the light of redgreenblue, and absorb the light of other colors other than redgreenblue.
In the utility model embodiment preferably selects, in above-mentioned projection screen, first film layer is multilayer, institute
Stating the second film layer is multilayer；
Wherein, the second film layer described in the first film layer and multilayer described in multilayer is arranged alternately, so that two layers first of arbitrary neighborhood
It is provided between film layer between two layers one layer of second film layer, arbitrary neighborhood of second film layers and is provided with one layer of first film
Layer.
In the utility model embodiment preferably selects, in above-mentioned projection screen, further includes:
Optical structure layers, the optical structure layers are between the imaging layer and the reflexed light film, to incident light
The direction of propagation of beam is adjusted.
In the utility model embodiment preferably selects, in above-mentioned projection screen, the optical structure layers are circle
Fresnel lens structure, linear light grid structure, pyramid-shaped structures or prismatic table shape structure.
In the utility model embodiment preferably selects, in above-mentioned projection screen, the optical structure layers are circle
Fresnel lens structure, and include:
Close to the smooth surface of the imaging layer；
Close to the structural plane of the reflexed light film, which has concentric loop structure；
Wherein, the section of the circular Fresnel lens structure is zigzag in the structural plane side, and each sawtooth
Included angle is incremented by successively or successively decreases.
In the utility model embodiment preferably selects, in above-mentioned projection screen, the substrate layer includes:
First base material layer, the first base material layer are located at one side of the imaging layer far from the optical structure layers；
Second substrate layer, second substrate layer is between the imaging layer and the optical structure layers.
In the utility model embodiment preferably selects, in above-mentioned projection screen, further includes:
Anti-scratch layer, the anti-scratch layer are located at one side of the reflexed light film far from the imaging layer.
The utility model embodiment additionally provides a kind of optical projection system, including laser projection and is based on the laser projection
The light beam of machine output carries out the projection screen of imaging display, which includes:
Substrate layer；
It is made in the laminated imaging layer of the substrate；
It is made in the imaging layer reflexed light film laminated far from the substrate；
Wherein, the reflexed light film includes the first film layer and has the second film layer of different refractivity with first film layer,
So that the reflexed light film can reflect the light of redgreenblue, and absorb the light of other colors other than redgreenblue.
In the utility model embodiment preferably selects, in above-mentioned optical projection system, first film layer is multilayer, institute
Stating the second film layer is multilayer；
Wherein, the second film layer described in the first film layer and multilayer described in multilayer is arranged alternately, so that two layers first of arbitrary neighborhood
It is provided between film layer between two layers one layer of second film layer, arbitrary neighborhood of second film layers and is provided with one layer of first film
Layer.
In the utility model embodiment preferably selects, in above-mentioned optical projection system, further includes:
Optical structure layers, the optical structure layers are between the imaging layer and the reflexed light film, to incident light
The direction of propagation of beam is adjusted.
Projection screen provided by the utility model and optical projection system, by setting by the first different film layer of refractive index and the
The reflexed light film that two film layers are constituted, to absorb the light of other colors other than redgreenblue, it is possible to prevente effectively from environment light
The light beam of other colors other than redgreenblue enters imaging layer, and after mixing with the light beam of projector output, to imaging layer
The imaging effect problem that impacts, and then cause imaging effect poor, greatly improve pair when projection screen imaging
It is more quasi- than degree, color rendition, luminance gain and color.
To enable the above objects, features, and advantages of the utility model to be clearer and more comprehensible, preferred embodiment is cited below particularly, and
Cooperate appended attached drawing, is described in detail below.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of optical projection system provided by the embodiment of the utility model.
Fig. 2 is the structural schematic diagram of projection screen provided by the embodiment of the utility model.
Fig. 3 is the structural schematic diagram of reflexed light film provided by the embodiment of the utility model.
Fig. 4 is another structural schematic diagram of projection screen provided by the embodiment of the utility model.
Fig. 5 is another structural schematic diagram of projection screen provided by the embodiment of the utility model.
Fig. 6 is the structural schematic diagram of optical structure layers provided by the embodiment of the utility model.
Fig. 7 is another structural schematic diagram of projection screen provided by the embodiment of the utility model.
Fig. 8 is another structural schematic diagram of projection screen provided by the embodiment of the utility model.
Icon: 10- optical projection system；100- projection screen；110- substrate layer；111- first base material layer；The second substrate of 113-
Layer；120- imaging layer；130- reflexed light film；The first film layer of 131-；The second film layer of 133-；140- optical structure layers；141- structure
Face；143- sawtooth；150- anti-scratch layer；200- laser projection.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is a part of the embodiment of the utility model, instead of all the embodiments.Usually retouched in attached drawing here
The component of the utility model embodiment stated and shown can be arranged and be designed with a variety of different configurations.
Therefore, requirement is not intended to limit to the detailed description of the embodiments of the present invention provided in the accompanying drawings below
The scope of the utility model of protection, but it is merely representative of the selected embodiment of the utility model.Based in the utility model
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the range of the utility model protection.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.In the utility model
In description, term " first ", " second " etc. are only used for distinguishing description, and should not be understood as only or imply relative importance.
In the description of the present invention, unless otherwise clearly defined and limited, term " setting ", " connected ", " company
Connect " it shall be understood in a broad sense, for example, it may be being fixedly connected, it may be a detachable connection, or be integrally connected；It can be machine
Tool connection, is also possible to be electrically connected；It can be directly connected, two members can also be can be indirectly connected through an intermediary
Connection inside part.For the ordinary skill in the art, it can understand that above-mentioned term is practical new at this with concrete condition
Concrete meaning in type.
As shown in Figure 1, the utility model embodiment provides a kind of optical projection system 10, it may include 100 He of projection screen
Laser projection 200.Wherein, the laser projection 200 can be with output beam to the projection screen 100, the projection screen
The light beam that curtain 100 can be exported based on the laser projection 200 carries out imaging and shows.
Optionally, the optical device that the laser projection 200 includes is unrestricted, can according to practical application request into
Row setting for example, may include, but is not limited to red, green and blue three coloured light valves, close beam X prism, projection lens and
Drive the optical devices such as light valve, if can effectively output red, green and blue laser beam.
In conjunction with Fig. 2, the utility model embodiment also provides a kind of projection screen that can be applied to above-mentioned optical projection system 10
100.Wherein, the projection screen 100 may include substrate layer 110, imaging layer 120 and reflexed light film 130, to form one kind
Front projection screen.
In detail, the front projection screen refers to, laser projection 200 and viewer are located at projection screen in the application
100 the same side.Also, the imaging layer 120 can be made in the one side of the substrate layer 110, and the reflexed light film 130 can
To be made in one side of the imaging layer 120 far from the substrate layer 110.
By above-mentioned setting, environment light successively passes through the substrate layer 110, imaging layer 120 and reflecting layer, and anti-at this
Penetrating layer is the light beam for being predominantly absorbed other colors other than redgreenblue, is reflected onto the imaging layer to avoid the light beam
The effect of imaging display is impacted when 120.
Optionally, the concrete type of the substrate layer 110 is unrestricted, can be configured according to practical application request,
For example, either flexible structure, is also possible to the structure with certain rigidity.Wherein, flexible structure may include, but unlimited
In flexible plastic films such as PE, PVC, CPP, BOPP, PC, PET, PA or TPU.May include with certain rigid structure, but
It is not limited to the transparent substrates such as glass, acrylic.
Also, the substrate layer 110 is unrestricted to the light transmittance of visible light, can be set according to practical application request
It sets.It in the present embodiment, is the effect for guaranteeing imaging display, the light transmittance of the substrate layer 110 can be greater than or equal to 75%.
Optionally, the concrete type of the imaging layer 120 is unrestricted, can be configured according to practical application request,
For example, it may be resin layer, is also possible to that minuteness particle will be added to increase the diffusivity to light beam in resin layer.
In conjunction with Fig. 3, the reflexed light film 130 may include the first film layer 131 and the second film layer 133.Also, described first
Film layer 131 is different with the refractive index of second film layer 133, so that the reflexed light film 130 can reflect redgreenblue
Light, and absorb the light of other colors other than redgreenblue.
Pass through the setting of above-mentioned reflexed light film 130, it is ensured that by the RGB in the light beam of the reflexed light film 130
The light beam of other colors other than three colors is absorbed, so as to reflex in the light beam in the imaging layer 120 without containing RGB
The light beam of other colors other than three colors, and then improve imaging effect of the imaging layer 120 when carrying out imaging display.
Optionally, the quantity of first film layer 131 and second film layer 133 is unrestricted, can be according to actually answering
It is configured with demand.In the present embodiment, first film layer 131 can be multilayer, and second film layer 133 can be more
Layer.
Wherein, the distribution mode of the second film layer 133 described in the first film layer 131 and multilayer described in multilayer is unrestricted, can be with
It is configured according to practical application request, for example, being also possible to arbitrarily set either be configured according to certain rule
It sets.In the present embodiment, the second film layer 133 described in the first film layer 131 and multilayer described in multilayer can be arranged alternately, that is,
It says, one layer of second film layer 133, two layers of second film layers of arbitrary neighborhood is provided between two layers of first film layers 131 of arbitrary neighborhood
One layer of first film layer 131 is provided between 133.
Also, the quantity of first film layer 131 and second film layer 133 both can be equal, can also be unequal.Its
In, when quantity is equal, distribution mode either the first film layer 131, the second film layer 133, the first film layer 131 ...,
Two film layers 133, the first film layer 131, the second film layer 133 are also possible to the second film layer 133, the first film layer 131, the second film layer
133 ..., the first film layer 131, the second film layer 133, the first film layer 131.When quantity is unequal, distribution mode both can be with
Be the first film layer 131, the second film layer 133, the first film layer 131 ..., the second film layer 133, the first film layer 131, be also possible to
Second film layer 133, the first film layer 131, the second film layer 133 ..., the first film layer 131, the second film layer 133.
In detail, and distribution mode equal in quantity is the first film layer 131, the second film layer 133, the first film layer
131 ..., when the second film layer 133, the first film layer 131, the second film layer 133, a kind of feasible show is present embodiments provided
Example, with the purpose of the light of other colors other than the light of realization reflection redgreenblue and absorption redgreenblue.Wherein, described
The material of first film layer 131 can be Ta2O5, the material of second film layer 133 can be SiO2.Also, each first film
Layer 131 and the thickness ratio of each second film layer 133 can be 2.2533:1.7807:1.3634:0.8593:2.6807:
1.5430:1.6915:1.8311:0.6589:1.8712:0.6033:0.6611:1.3548: 0.9307:0.83:0.5007:
2.6926:1.9117:2.7919:2.5939:1.9604:1.1691:2.0211:2.0012.
In quantity equal and distribution mode be the second film layer 133, the first film layer 131, the second film layer 133 ..., first
When film layer 131, the second film layer 133, the first film layer 131, a kind of feasible example is present embodiments provided, to realize that reflection is red green
The light of Lan Sanse and the purpose of the light of other colors other than absorption redgreenblue.Wherein, the material of first film layer 131
It can be Ta2O5, the material of second film layer 133 can be SiO2.Also, each second film layer 133 and each described first
The thickness ratio of film layer 131 can be 0.9811:0.9975:0.1382:0.9073:1.1976:0.9753:0.5649:4.003:
1.0146:0.266:1.1052:2.5391:1.1306:3.4189:0.9967:1.0761:1 .1626:0.011:0.023:
0.0152。
In quantity unequal and distribution mode be the first film layer 131, the second film layer 133, the first film layer 131 ..., the
When two film layers 133, the first film layer 131, a kind of feasible example is present embodiments provided, to realize the light of reflection redgreenblue
And the purpose of the light of other colors other than absorption redgreenblue.Wherein, the material of first film layer 131 can be
Ta2O5, the material of second film layer 133 can be SiO2.Also, each first film layer 131 and each second film layer
133 thickness ratio can be 1.4347:0.9025:2.3245:0.9605:2.6064:1.8243:1.0624:1.0293:
0.3972:1.4203:0.7972:0.1216:2.6647:2.3339:0.7576:2.0144: 0.0123.
In quantity unequal and distribution mode be the second film layer 133, the first film layer 131, the second film layer 133 ..., the
One film layer 131, the second film layer 133, present embodiments provide a kind of feasible example, with realize reflection redgreenblue light and
Absorb the purpose of the light of other colors other than redgreenblue.Wherein, the material of first film layer 131 can be Ta2O5,
The material of second film layer 133 can be SiO2.Also, the thickness of each second film layer 133 and each first film layer 131
Spending ratio can be 1.0068:0.9979:2.2405:3.1306:0.2441:0.4243:0.9504:0.6499: 0.9836:
0.9486:1.7786:2.7717:0.9281:2.7483:0.4327:0.8176:0.5342.
Wherein, the thickness of each first film layer 131 and each second film layer 133, can be in above-mentioned each ratio value
On the basis of multiplied by a coefficient value, which can be configured according to the reflectivity that reflexed light film 130140 needs.Example
Such as, when the reflexed light film 130 is needed to the light of 500nm reflectivity with higher, which can be (500/4) nm.
Also, the value of above-mentioned each ratio value is unrestricted, can be configured according to practical application request, if be greater than 0 and
Less than or equal to 10.
It is understood that the material of first film layer 131 is Ta in above-mentioned each example2O5, second film layer
133 material is SiO2It is a kind of application example that can be substituted, without a kind of unique feasible embodiment should be limited to.
That is, first film layer 131 and second film layer 133 can also combine to be formed by other materials, for example, can be with
Include, but are not limited to TiO2/SiO2、Nb2O5/SiO2、Al2O3/SiO2、HfO2/SiO2、TiO2/MgF2、Nb2O5/MgF2、Ta2O5/
MgF2、Al2O3/MgF2、HfO2/MgF2Contour, low-index material combination.
Also, in above-mentioned application example, the quantity for each film layer that the reflexed light film 130 includes is unrestricted, can be with
It is configured according to practical application request, for example, the quantity for each film layer that the reflexed light film 130 includes can be to be greater than or wait
In 18 and be less than or equal to 400.
Wherein, the connective stability between each first film layer 131 and each second film layer 133 to improve production, Ke Yi
When making film layer, the temperature and vacuum degree of production environment are controlled, to guarantee the tightness between each film layer.For example, true
The order of magnitude of reciprocal of duty cycle should be not less than 10-4Pa。
Further, to adjust brightness of the direction of propagation of the light beam in the projection screen 100 to improve imaging display,
In the present embodiment, in conjunction with Fig. 4, the projection screen 100 can also include optical structure layers 140.
Wherein, the optical structure layers 140 are between the imaging layer 120 and the reflexed light film 130, that is,
It says, the optical structure layers 140 can be made far from the one side of the substrate layer 110 in the imaging layer 120, and making
Cheng Hou makes the reflexed light film 130 far from the one side of the imaging layer 120 in the optical structure layers 140.
Optionally, the type of the optical structure layers 140 is unrestricted, can be configured according to practical application request,
As long as effectively the direction of propagation of light beam can be adjusted, for example, may include, but it is saturating to be not limited to circular Fresnel
Mirror structure, linear light grid structure, pyramid-shaped structures or prismatic table shape structure.Also, the linear light grid structure is either column grating,
It is also possible to zigzag grating.It is described, it both may include trigone, tetragonous in the pyramid-shaped structures and the prismatic table shape structure,
It also may include the rib of other quantity.
Wherein, in conjunction with Fig. 5, when the optical structure layers 140 are circular Fresnel lens structure, may include smooth surface and
Structural plane 141,141 imprinting of structural plane have concentric loop structure.Also, the smooth surface is close to the imaging layer 120, the knot
Structure face 141 is close to the reflexed light film 130.That is, light beam successively passes through the light after the imaging layer 120 output
The reflexed light film 130 is transmitted to behind face and the structural plane 141.
The section of the optical texture can be made in the structure by the setting of above-mentioned concentric loop structure in conjunction with Fig. 6
The side in face 141 forms laciniation.Also, the laciniation may include multiple continuous sawtooth 143.
Wherein, in order to which the transmission direction to the light beam by the structural plane 141 is effectively adjusted, the multiple company
The angle of the angle of continuous sawtooth 143 can be incremented by successively or successively decreases.In detail, in actual use, laser projection
The light beam of 200 outputs can be exported along upwardly inclined direction to the projection screen 100, therefore, the angle of each sawtooth 143
Angle can successively successively decrease from the bottom up.
Further, the optical structure layers 140 can also be is made in the imaging layer 120 indirectly.In the present embodiment
In, in conjunction with Fig. 7, the substrate layer 110 may include first base material layer 111 and the second substrate layer 113.
Wherein, the first base material layer 111 is located at one side of the imaging layer 120 far from the optical structure layers 140, institute
The second substrate layer 113 is stated between the imaging layer 120 and the optical structure layers 140.That is, the imaging layer
120 can be made in the first base material layer 111, and the optical structure layers 140 can be made in second substrate layer 113,
Then second substrate layer 113 is fitted in into the imaging layer 120 again.
Further, to be protected to the reflexed light film 130, in the present embodiment, in conjunction with Fig. 8, the projection screen
Curtain 100 can also include anti-scratch layer 150.
Wherein, the anti-scratch layer 150 is located at one side of the reflexed light film 130 far from the imaging layer 120, to avoid
The reflexed light film 130 is scratched far from the one side of the imaging layer 120 by external devices, and then leads to asking for reflecting effect reduction
Topic.
Optionally, the material type of the anti-scratch layer 150 is unrestricted, can be set according to practical application request
It sets, as long as can have preferable adhesion strength, for example, either transparent glass, transparent plastic plate, transparent
The materials such as ceramics are also possible to one layer of stable compound-material of property, such as resin, SiO2、Al2O3, silicon nitride etc..
In conclusion projection screen 100 provided by the utility model and optical projection system 10, by setting by refractive index difference
The first film layer 131 and the second film layer 133 constitute reflexed light film 130, to absorb other colors other than redgreenblue
Light, it is possible to prevente effectively from the light beam of other colors in environment light other than redgreenblue enters imaging layer 120, and and projector
After the light beam mixing of output, the problem that the imaging effect of imaging layer 120 is impacted, and then causes imaging effect poor, pole
Contrast, color rendition, luminance gain and the color that the earth improves when projection screen 100 is imaged are quasi-.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of projection screen characterized by comprising
Substrate layer；
It is made in the laminated imaging layer of the substrate；
It is made in the imaging layer reflexed light film laminated far from the substrate；
Wherein, the reflexed light film includes the first film layer and has the second film layer of different refractivity with first film layer, so that
The reflexed light film can reflect the light of redgreenblue, and absorb the light of other colors other than redgreenblue.
2. projection screen according to claim 1, which is characterized in that first film layer is multilayer, second film layer
For multilayer；
Wherein, the second film layer described in the first film layer and multilayer described in multilayer is arranged alternately, so that two layers of first film layers of arbitrary neighborhood
Between be provided between two layers one layer of second film layer, arbitrary neighborhood of second film layers and be provided with one layer of first film layer.
3. projection screen according to claim 1 or 2, which is characterized in that further include:
Optical structure layers, the optical structure layers are between the imaging layer and the reflexed light film, to incident light beam
The direction of propagation is adjusted.
4. projection screen according to claim 3, which is characterized in that the optical structure layers are circular Fresnel lens knot
Structure, linear light grid structure, pyramid-shaped structures or prismatic table shape structure.
5. projection screen according to claim 4, which is characterized in that the optical structure layers are circular Fresnel lens knot
Structure, and include:
Close to the smooth surface of the imaging layer；
Close to the structural plane of the reflexed light film, which has concentric loop structure；
Wherein, the section of the circular Fresnel lens structure is zigzag, and the angle of each sawtooth in the structural plane side
Angle is incremented by successively or successively decreases.
6. projection screen according to claim 3, which is characterized in that the substrate layer includes:
First base material layer, the first base material layer are located at one side of the imaging layer far from the optical structure layers；
Second substrate layer, second substrate layer is between the imaging layer and the optical structure layers.
7. projection screen according to claim 1 or 2, which is characterized in that further include:
Anti-scratch layer, the anti-scratch layer are located at one side of the reflexed light film far from the imaging layer.
8. a kind of optical projection system, which is characterized in that including laser projection and based on the laser projection output light beam into
The projection screen of row imaging display, the projection screen include:
Substrate layer；
It is made in the laminated imaging layer of the substrate；
It is made in the imaging layer reflexed light film laminated far from the substrate；
Wherein, the reflexed light film includes the first film layer and has the second film layer of different refractivity with first film layer, so that
The reflexed light film can reflect the light of redgreenblue, and absorb the light of other colors other than redgreenblue.
9. optical projection system according to claim 8, which is characterized in that first film layer is multilayer, second film layer
For multilayer；
Wherein, the second film layer described in the first film layer and multilayer described in multilayer is arranged alternately, so that two layers of first film layers of arbitrary neighborhood
Between be provided between two layers one layer of second film layer, arbitrary neighborhood of second film layers and be provided with one layer of first film layer.
10. optical projection system according to claim 8 or claim 9, which is characterized in that further include:
Optical structure layers, the optical structure layers are between the imaging layer and the reflexed light film, to incident light beam
The direction of propagation is adjusted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821814552.6U CN208819014U (en) | 2018-11-05 | 2018-11-05 | Projection screen and optical projection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821814552.6U CN208819014U (en) | 2018-11-05 | 2018-11-05 | Projection screen and optical projection system |
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| CN208819014U true CN208819014U (en) | 2019-05-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031879A (en) * | 2018-11-05 | 2018-12-18 | 成都菲斯特科技有限公司 | Projection screen and optical projection system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031879A (en) * | 2018-11-05 | 2018-12-18 | 成都菲斯特科技有限公司 | Projection screen and optical projection system |
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