CN115343909A - Projection screen and projection equipment - Google Patents
Projection screen and projection equipment Download PDFInfo
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- CN115343909A CN115343909A CN202211028191.3A CN202211028191A CN115343909A CN 115343909 A CN115343909 A CN 115343909A CN 202211028191 A CN202211028191 A CN 202211028191A CN 115343909 A CN115343909 A CN 115343909A
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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
- G03B21/60—Projection screens characterised by the nature of the surface
- G03B21/602—Lenticular screens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
Abstract
The application discloses projection screen and projection equipment relates to projection display technology field for solve the relatively poor problem of projection screen's homogeneity. The projection screen comprises a surface layer, a Fresnel lens layer and a reflecting layer which are sequentially stacked. One side of the Fresnel lens layer, which is close to the reflecting layer, is provided with a plurality of Fresnel microstructures which are arranged in the same circle center. The circle centers of the Fresnel microstructures are positioned outside the projection screen. The projection of the light outlet of the projector on the plane where the projection screen is located on one side, away from the projection screen, of the circle centers of the Fresnel microstructures. The projection screen is used for displaying images projected by the projector.
Description
Technical Field
The application relates to the technical field of projection display, in particular to a projection screen and projection equipment.
Background
In the field of projection display technology, projectors are commonly used in conjunction with projection screens. The light emitted by the projector is projected onto the projection screen, and reaches the eyes of the audience after being reflected by the projection screen, so that the audience can watch the image formed by the light on the surface of the projection screen.
To increase the gain of the projection screen, the projection screen typically includes a fresnel lens layer. The Fresnel lens layer can play a role in gathering light, and then the gain of the projection screen is improved. However, under the influence of the surface structure of the projection screen, the uniformity of the existing projection screen with the fresnel lens layer is poor, and the use requirement of a user cannot be met.
Disclosure of Invention
The application provides a projection screen and projection equipment for solve the relatively poor problem of projection screen's homogeneity.
In order to achieve the purpose, the technical scheme is as follows:
in one aspect, an embodiment of the present application provides a projection screen for reflecting light projected by a projector. The projection screen comprises a surface layer, a Fresnel lens layer and a reflecting layer which are sequentially stacked. One side of the Fresnel lens layer, which is close to the reflecting layer, is provided with a plurality of Fresnel microstructures which are arranged in a concentric manner. The circle centers of the Fresnel microstructures are located outside the projection screen. The projection of the light outlet of the projector on the plane where the projection screen is located on one side, away from the projection screen, of the circle centers of the Fresnel microstructures.
The projection screen provided by the embodiment of the application comprises a surface layer, a Fresnel lens layer and a reflecting layer which are sequentially stacked. When reaching the projection screen, the light rays projected by the projector sequentially pass through the surface layer and the Fresnel lens layer and then reach the reflecting layer. Under the reflection of the reflection layer, the light is reflected to the Fresnel lens layer and the surface layer in sequence and finally reflected to the eyes of the audience, and the audience can watch the image on the projection screen.
Because light can assemble to the screen center when the fresnel lens layer is being passed through to light, the spectator can watch the image that luminance is higher in the position that is just to projection screen, and projection screen's gain is higher. Meanwhile, the Fresnel lens layer can also play a certain role of resisting ambient light, and the ambient light can be reflected towards the non-human eye watching area under the action of the Fresnel microstructures.
In addition, because the projection of the light outlet of the projector on the plane where the projection screen is located on one side, away from the projection screen, of the circle center of the multiple fresnel microstructures, namely, the radius of the fresnel microstructures at the same position in the projection screen is reduced compared with the original radius, so that the light is converged more towards the center of the projection screen, and the uniformity of the projection screen is improved.
In some embodiments, the projection screen is rectangular in shape. The centers of circles of the Fresnel microstructures are located on the central axis of the projection screen. The central axis of the projection screen is perpendicular to the length direction of the projection screen.
In some embodiments, the length of the diagonal of the projection screen is 80 inches, and the ratio of the length of the projection screen to the width of the projection screen is 16:9. the shortest distance between the circle centers of the Fresnel microstructures and the projection screen is less than 143mm.
In some embodiments, the length of the diagonal of the projection screen is 100 inches, and the ratio of the length of the projection screen to the width of the projection screen is 16:9. the shortest distance between the circle centers of the Fresnel microstructures and the projection screen is less than 180mm.
In some embodiments, the length of the diagonal of the projection screen is 120 inches, and the ratio of the length of the projection screen to the width of the projection screen is 16:9. the shortest distance between the circle centers of the Fresnel microstructures and the projection screen is less than 216mm.
In some embodiments, the shortest distance between the center of the plurality of fresnel microstructures and the projection screen is greater than 40mm.
On the other hand, the embodiment of the application provides a projection device, which comprises a projector and the projection screen. The projector is located on the side of the projection screen where the surface layer is located. The projector is provided with a light outlet, the projection of the light outlet on the plane of the projection screen is light source projection, and the light source projection is positioned on the central axis.
Because the projection device provided by the embodiment of the application comprises the projection screen, the same technical problem as the projection screen can be solved, the same technical effect is achieved, and the details are not repeated here.
In some embodiments, the shortest distance between the center of the plurality of fresnel microstructures and the projection screen is in positive correlation with the shortest distance between the projection of the light source and the projection screen.
In some embodiments, the shortest distance between the center of the plurality of fresnel microstructures and the projection screen is less than two-thirds of the shortest distance between the projection of the light source and the projection screen.
In some embodiments, the shortest distance between the center of the plurality of fresnel microstructures and the projection screen is greater than two fifths of the shortest distance between the projection of the light source and the projection screen.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of a projector and a projection screen of the related art in position for use;
fig. 2 is a schematic usage state diagram of a projection apparatus provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of a projection screen according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a fresnel lens layer according to an embodiment of the present disclosure;
fig. 5 is a schematic view illustrating a light projection of a projection screen according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a viewer viewing a projection screen from the side;
fig. 7 is a schematic structural diagram of another projection screen provided in an embodiment of the present application;
FIG. 8 is a schematic structural diagram of a surface layer provided in an embodiment of the present disclosure;
FIG. 9 is a schematic structural diagram of another surface layer provided in an embodiment of the present application;
FIG. 10 is a schematic view of the micro-lenses on the surface layer shown in FIG. 9 after being atomized;
fig. 11 is a schematic structural diagram of a reflective layer according to an embodiment of the present disclosure;
fig. 12 is a schematic structural diagram of another reflective layer provided in this embodiment of the present application.
Reference numerals:
01-a projector; 02-projection screen;
100-a projection device; 1-a projection screen; 11-a surface layer; 12-a fresnel lens layer; 121-fresnel microstructure; 13-a reflective layer; 14-a diffusion layer; 15-a coloured layer; 16-a substrate layer; 2-a projector; 21-incident light; 22-outgoing rays; 23-a light outlet; 3-a viewer; 40-diffusing particles; 50-micro lens.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
In the description of the present application, it is to be understood that the terms, "upper", "lower", "front", "inner", "center", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
In the embodiments of the present application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a component of' 8230; \8230;" does not exclude the presence of another like element in a process, method, article, or apparatus that comprises the element.
In the embodiments of the present application, the words "exemplary" or "such as" are used herein to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
In the technical field of projection display, especially in the field of ultrashort-focus laser projection display, in order to achieve better brightness and display effect, a projector can be matched with a projection screen with a Fresnel microstructure. Wherein the projection screen generally comprises a fresnel lens layer. The Fresnel lens layer is provided with a plurality of Fresnel microstructures which are concentrically arranged.
In the related art, as shown in fig. 1, fig. 1 is a schematic diagram illustrating a position of a projector 01 and a projection screen 02 in the related art when they are used, a circle center O of a plurality of fresnel microstructures is generally located outside the projection screen 02, and a position of the circle center 0 is designed according to related parameters of the projector 01. The centers O of the fresnel microstructures are generally on the same horizontal line with the light outlet of the projector 01.
The shortest distance d between the center O of the fresnel microstructure and the projection screen 02 is generally over 170mm, so as to be suitable for an ultra-short-focus projector. Illustratively, when projection is performed using projector 01 having an 80 inch size, 0.25 throw ratio, and 145% offset, the shortest distance d between the center O of the fresnel microstructure and the projection screen 02 is typically about 224 mm.
The offset is a ratio of a shortest distance between a projection of the light exit of the projector 01 on the plane where the projection screen 02 is located and the center of the projection screen 02 to a shortest distance between the center of the projection screen 02 and a side edge close to the projector 01, that is, a value of (d 1+ d)/d 1 shown in fig. 1.
With the adoption of the Fresnel microstructure designed in the manner, the uniformity of the projection screen 02 can reach about 75% theoretically. However, in practical applications, the surface of the projection screen 02 generally cannot be a smooth and flat surface, and when the light exits the projection screen 02, a certain deflection occurs, so that a part of the light is deflected outward, and further the actual uniformity of the projection screen 02 is reduced, and the actual demand cannot be met when the uniformity is lower than 70%.
Based on this, an embodiment of the present application provides a projection apparatus 100, and referring to fig. 2, fig. 2 is a schematic view of a use state of the projection apparatus 100 provided in the embodiment of the present application. Projection device 100 may include a projection screen 1 and a projector 2.
In use of projection device 100, projector 2 may be positioned below and in front of projection screen 1, and audience 3 may be positioned in front of projection screen 1 and looking at projection screen 1. Incident light 21 emitted by the projector 2 is irradiated to the projection screen 1, and the incident light 21 is reflected by the projection screen 1 to finally form emergent light 22 to be irradiated to the audience 3, and simultaneously, images are formed in the projection screen 1.
The projector 2 shown in fig. 2 may include a laser, which may be one of a monochromatic laser, a dichroic laser, and a three-color laser. The three-color laser can emit blue laser, red laser and green laser. The wavelength of blue laser light emitted from the laser may be set to a range of 430nm-460nm, the wavelength of green laser light emitted may be set to a range of 500nm-540nm, and the wavelength of red laser light emitted may be set to a range of 610nm-650nm.
Since the three-color laser has the advantages of color fidelity and high color gamut, the laser in the projector 2 provided by the embodiment of the present application can be selected from the three-color laser. Of course, the laser in the projector 2 provided in the embodiment of the present application may also be a monochromatic laser or a dichroic laser.
The following illustrates a specific structure of the projection screen having the fresnel microstructure provided in the embodiment of the present application.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a projection screen 1 according to an embodiment of the present disclosure. The projection screen 1 may include a surface layer 11, a fresnel lens layer 12, and a reflective layer 13, which are sequentially stacked. The fresnel lens layer 12 has a plurality of fresnel microstructures 121 concentrically arranged on a side thereof close to the reflective layer 13.
Continuing with FIG. 3, the center O of the plurality of Fresnel microstructures 1 Outside the projection screen 1. The light outlet 23 of the projector 2 is on the plane of the projection screen 1Is located at the center O of the plurality of fresnel microstructures 121 1 The side remote from the projection screen 1.
It will be appreciated that the fresnel microstructure 121 is capable of concentrating light towards the centre of the projection screen 1, the smaller the radius of the fresnel microstructure 121, the higher the degree to which light is concentrated towards the centre.
The projection of the projector 2 on the plane of the projection screen 1 is located at the center O of the multiple fresnel microstructures 121 1 The side far away from the projection screen 1, i.e. the center O of the fresnel microstructure 121 1 The distance from the projection screen 1 is reduced, that is, the radius of the plurality of fresnel microstructures 121 is reduced.
Thus, when the light projected by the projector 2 is projected to the plurality of fresnel microstructures 121 of the projection screen 1, the light is more converged toward the center of the projection screen 1, and the uniformity of the projection screen 1 is better.
Thus, as shown in fig. 3, the projection screen 1 provided in the embodiment of the present application includes a surface layer 11, a fresnel lens layer 12, and a reflection layer 13, which are sequentially stacked. When reaching the projection screen 1, the light rays projected by the projector 2 pass through the surface layer 11 and the fresnel lens layer 12 in sequence and reach the reflective layer 13. Under the reflection of the reflective layer 13, the light is reflected to the fresnel lens layer 12 and the surface layer 11 in sequence, and finally reflected to the eyes of the viewer 3, so that the viewer 3 can view an image on the projection screen 1.
Since the light rays converge toward the center of the screen when passing through the fresnel lens layer 12, the viewer 3 can view an image with higher brightness at a position facing the projection screen 1, and the gain of the projection screen 1 is higher. Meanwhile, the fresnel lens layer 12 can also play a role in resisting ambient light to some extent, and the ambient light can be reflected toward a non-human eye viewing area under the action of the fresnel microstructure.
In addition, because the projection of the light outlet 23 of the projector 2 on the plane of the projection screen 1 is located at the center O of the plurality of fresnel microstructures 121 1 The radius of the fresnel microstructure 121 far away from the side of the projection screen 1, i.e. at the same position in the projection screen 1, is reduced compared to the original radius, so that the light rays are more toward the projectionThe center of the screen 1 converges, improving the uniformity of the projection screen 1.
As shown in fig. 3, the fresnel microstructure 121 may be a triangular prism, one of the surfaces of the fresnel microstructure 121 is inclined to form an included angle, and the size of the included angle may be set according to actual situations. When the fresnel lens layer 12 is manufactured, a template having a small eccentricity distance may be selected for manufacturing. Wherein the eccentric distance is the above mentioned circle center O 1 The shortest distance to the projection screen 1.
In some embodiments, as shown in fig. 4, fig. 4 is a schematic structural diagram of a fresnel lens layer 12 provided in the embodiments of the present disclosure, and a shape of a projection screen (fig. 3) may be a rectangle, that is, the fresnel lens layer 12 is also a rectangle. Center O of multiple fresnel microstructures 121 1 Located in the central axis of the projection screen 1 (fig. 3) (i.e., the central axis of the fresnel lens layer 12 shown in fig. 4). Wherein, the central axis of the projection screen 1 is perpendicular to the length direction of the projection screen 1.
Because the center of the circle of the fresnel microstructure 121 is located on the central axis of the projection screen 1, the light rays converge toward the center of the projection screen 1, so that the brightness of the light rays around the center of the projection screen 1 is relatively uniform, and the uniformity of the overall brightness of the projection screen is relatively good.
As shown in fig. 3, the projector 2 is located on the side of the projection screen 1 where the surface layer 11 is located, and has a light outlet 23, and light is emitted from the light outlet 23 to the projection screen 1. The projection of the light outlet 23 of the projector 2 on the plane of the projection screen is a light source projection O 2 . When the projection screen 1 is rectangular, the light source projects an image O 2 Also located on the central axis.
Because the light outlet 23 of the projector 2 is located on the central axis of the projection screen 1, the center of the picture projected by the projector 2 can be exactly coincident with the center of the projection screen 1, so that the light projected by the projector 2 can be projected onto the surface of the projection screen 1 as much as possible. Referring to fig. 3, when the rectangular projection screen 1 is used, the width direction of the projection screen 1 is the up-down direction in fig. 3, and is also the height direction viewed by the viewer 3.
The light projection of the projection screen 1 provided in the embodiment of the present application is exemplarily described below with reference to the drawings. Referring to fig. 5, fig. 5 is a schematic view illustrating light projection of the projection screen 1 according to the embodiment of the present disclosure, light is emitted from the light outlet 23, projected onto the projection screen 1, reflected by the projection screen 1, and then reflected onto the reference plane S.
With continued reference to fig. 5, a dashed line A1 is a fresnel microstructure 121 (fig. 4) in the projection screen 1, and the light thereof is reflected to a position A1'. A2 is a fresnel microstructure 121 (fig. 4) with a larger radius at the same position under the projection screen with the same size, and the light thereof is reflected to a position A2' correspondingly.
It is understood that A2' can be regarded as a light projection path of the projection screen in the related art. Therefore, it can be seen that the projection screen 1 provided in the embodiment of the present application, on one side of the central axis, A1 'is closer to the center than A2', when the viewer watches at the central point, the brightness near the central point is more uniform, and the uniformity of the projection screen is better. Meanwhile, the light rays at the positions on the central axes of A1 'and A2' are reflected to the central point of the reference plane S.
Referring to fig. 3, to ensure the light source projection O of the projector 2 2 Can be located at center O of fresnel microstructure 121 1 Far from the side of the projection screen 1, the centers O of the multiple fresnel microstructures 121 1 The shortest distance L to the projection screen 1 1 Can project with the light source 2 The shortest distance L between the projection screen 1 and the object 2 Is in a positive correlation. Wherein the light source projects an image O 2 The shortest distance L between the projection screen 1 and the object 2 Related to the offset, i.e. L, of the projector 2 2 = W (offset-1)/2, where W is the width of the projection screen 1.
Thus, when the light source projects an image O 2 The shortest distance L to the projection screen 1 2 When the size of the fresnel microstructure 121 is increased, the centers O of the fresnel microstructures can be increased 1 The shortest distance L to the projection screen 1 1 . The shortest distance L between the projection O2 of the light source and the projection screen 1 2 When the distance between the center O1 of the fresnel microstructures 121 and the projection screen 1 is reduced, the shortest distance L between the center O1 and the projection screen 1 can be reduced 1 。
In some embodiments, center O of plurality of fresnel microstructures 121 1 The shortest distance to the projection screen 1 may be smaller than the light source projection O 2 Two thirds of the shortest distance to the projection screen 1. Namely L 1 ＜2L 2 /3, i.e. L 1 ＜W(offset-1)/3。
Thus, when the projection apparatus 100 is in use, after the positions of the projector 2 and the projection screen 1 are determined, L 1 < W (offset-1)/3, and W (offset-1)/3 < W (offset-1)/2, i.e. the center O of the plurality of Fresnel microstructures 121 1 Located in the light source projection O 2 Near one side of the projection screen 1, the uniformity of the projected image of the projection screen 1 is better.
Of course, the centers O of the fresnel microstructures 121 1 The shortest distance L1 between the projection screen 1 and the light source projection O can be larger than that of the light source projection 2 The shortest distance L to the projection screen 1 2 Is less than two thirds of the projection O of the light source 2 The shortest distance L to the projection screen 1 2 . At this time, the centers O of the fresnel microstructures 121 1 Can also be positioned at the light source projection O 2 Near one side of the projection screen 1.
Phase contrast L 1 ＜L 2 In other words, when L is 1 ＜2L 2 When the fresnel micro-structures 121 are arranged on the projection screen 1, the radius of the fresnel micro-structures 121 is relatively small, that is, the radius of the fresnel micro-structures 121 corresponding to the same position of the projection screen 1 is relatively small, and when the light rays irradiate the position, the light rays are converged better, so that the uniformity of the projection screen 1 is better.
In some embodiments, the centers O of the plurality of fresnel microstructures 121 1 The shortest distance L to the projection screen 1 1 Or larger than the light source projection O 2 The shortest distance L to the projection screen 1 2 Two fifths of a year, i.e. L 1 ＞2L 2 Per 5, i.e. L 1 W (offset-1)/5. In this case, the projection effect of the projection screen 1 is good, and the uniformity of the projection screen is good.
When L is 1 ＜2L 2 At/5, the light is too concentrated toward the center of the projection screen 1. At this time, as shown in fig. 6,fig. 6 is a schematic structural diagram of a viewer 3 viewing the projection screen 1 from a side edge, where when the viewer views the projection screen 1 from the side edge, brightness unevenness is likely to occur on both sides of the projection screen 1, and thus the viewing effect of the projection screen 1 is reduced. Therefore, when the centers O of the plurality of fresnel microstructures 121 are located 1 The shortest distance L between the projection screen 1 and the object 1 Greater than the light source projection O 2 The shortest distance L to the projection screen 1 2 And when the distance is two fifths, the overall performance of the projection screen 1 is better, and the display effect of the projection picture is better.
Currently, the offset of the projector 2 is typically 129%, 133%, or 145%. In order to make the projection screen 1 with a certain size have better uniformity when using the projectors 2 with different offsets, different eccentric distances (i.e. the shortest distance L between the centers of the fresnel microstructures 121 and the projection screen 1) can be set for the projection screens 1 with different sizes 1 )。
In some embodiments, the length of the diagonal of projection screen 1 is 80 inches, and the ratio of the length of projection screen 1 to the width of projection screen 1 is 16:9. center O of multiple fresnel microstructures 121 1 The shortest distance to the projection screen 1 is less than 143mm.
Referring to FIG. 3, when the projector 2 with an offset of 129% is used, it is calculated that the light source projects O 2 The shortest distance L to the projection screen 1 2 Is 143mm. Due to the circle centers O of the plurality of Fresnel microstructures 121 1 The shortest distance between the Fresnel microstructure and the projection screen 1 is less than 143mm, so that the centers O of the Fresnel microstructures 121 are enabled to be arranged 1 Located in the light source projection O 2 Near one side of the projection screen 1. The uniformity of the projection picture is better.
Meanwhile, it can be understood that when the shortest distance between the center O1 of the plurality of fresnel microstructures 121 and the projection screen 1 is less than 143mm and a projector with an offset of 133% or 145% is used, the center O of the plurality of fresnel microstructures 121 may also be made to be the center O of the projection screen 1 1 Located in the light source projection O 2 Near one side of the projection screen 1.
Thus, based on the size of the projection screen 1, a plurality of foilsCenter O of the Nile microstructure 121 1 When the shortest distance between the projection screen and the projection screen 1 is less than 143mm and different types of projectors 2 are adopted, the uniformity of the projection picture is good, and the projection effect is guaranteed.
In some embodiments, the length of the diagonal of projection screen 1 is 100 inches, and the ratio of the length of projection screen 1 to the width of projection screen 1 is 16:9. center O of multiple fresnel microstructures 121 1 The shortest distance L between the projection screen 1 and the object 1 Less than 180mm.
Referring to fig. 3, when a projector 2 having an offset of 129% is used to project a projection screen 1 having a size of 100 inches, it is calculated that a light source projection O is formed 2 The shortest distance L to the projection screen 1 2 Is 180mm. When the centers O of the multiple fresnel microstructures 121 1 The shortest distance L to the projection screen 1 1 Less than 180mm, projection of light source O 2 Also located at center O of multiple fresnel microstructures 121 1 The uniformity of the projected picture is higher at the side far away from the projection screen 1.
Similarly, when the projector 2 with the offset of 133% or 145% is used for projection, the light source projects the light source projection O 2 Also located at center O of multiple fresnel microstructures 121 1 The side far away from the projection screen 1 also has a better projection effect. Therefore, based on the 100-inch projection screen 1, when different types of projectors 2 are used for projecting pictures, the pictures also have better uniformity.
In some embodiments, the length of the diagonal of projection screen 1 is 120 inches, and the ratio of the length of projection screen 1 to the width of projection screen 1 is 16:9. center O of multiple fresnel microstructures 121 1 The shortest distance to the projection screen 1 is less than 216mm.
Similarly, referring to fig. 3, for a 120 inch projection screen 1, projector 2 with an offset of 129% is used for projection. Calculated to obtain the light source projection O 2 The shortest distance L between the projection screen 1 and the object 2 Is 216mm. Due to the circle centers O of the plurality of Fresnel microstructures 121 1 The shortest distance L to the projection screen 1 1 Less than 216mm, light source projectionO 2 Also located at center O of multiple fresnel microstructures 121 1 The uniformity of the projected picture is higher at the side far away from the projection screen 1.
Similarly, when the projector 2 with the offset of 133% or 145% is used for projection, the light source projection O can be made 2 Located at circle center O of multiple Fresnel microstructures 121 1 The side far away from the projection screen 1 has better uniformity of the projection picture. When the 120-inch projection screen 1 is projected by different projectors 2, the pictures have better uniformity.
From the above, the centers O of the fresnel microstructures 121 1 The shortest distance between the projection screen 1 and the screen is not suitable to be too small, otherwise, the brightness of the pictures at the two sides of the projection screen 1 is easy to be inconsistent. Thus, in some embodiments, the plurality of fresnel microstructures have a center O 1 The shortest distance to the projection screen 1 may be greater than 40mm. For projection screens of different sizes, for example, 80 inches, 100 inches and 120 inches of projection screen 1, when the centers O of the multiple fresnel microstructures 1 When the shortest distance between the projection screen and the projection screen 1 is larger than 40mm, the brightness of the two sides of the projection picture can be kept consistent well, the condition of obvious inconsistency cannot occur, and the projection effect of the projection picture is good. Center O of a plurality of Fresnel microstructures 1 When the shortest distance to the projection screen 1 is too small, the brightness of the projection screen is likely to be inconsistent at both sides as shown in fig. 6.
Of course, the centers O of the plurality of fresnel microstructures 1 The shortest distance to the projection screen 1 may also be greater than other values, for example, 45mm or 50mm, and may be determined according to the effect of the projection picture corresponding to each value.
In addition, projection O is combined with the light source 2 Shortest distance L to projection screen 1 2 And the center O of the plurality of fresnel microstructures 121 1 Shortest distance L to projection screen 1 1 The relationship between them. For projectors with different offsets, different center O can be designed 1 The distance from the projection screen 1.
Illustratively, to2L 2 /5＜L 1 ＜2L 2 A/3, i.e., W (offset-1)/5 < L 1 < W (offset-1)/3 is exemplified. When the size of the projection screen 1 is 80 inches, the ratio of the length of the projection screen 1 to the width of the projection screen 1 is 16: when 9, 89.1mm < L when the projector 2 with the offset of 145% is used for projection 1 Less than 148mm. In this case, the projection screen 1 has a good uniformity of the projection screen. 65mm < L when projected with projector 2 having an offset of 133% 1 < 108mm. Similarly, the L of projection screen 1 of different sizes can be designed according to the offset values of different projectors 2 1 The value ranges of (a) are not exemplified in a plethora of ways here.
In addition, as shown in fig. 3, to further enlarge the viewing angle of the projection screen 1, in some embodiments, the projection screen may further include a diffusion layer 14. The diffusing layer 14 may be located on the side of the fresnel lens layer 12 remote from the reflective layer 13. Diffusion particles 40 are distributed within the diffusion layer 14. Light entering the projection screen 1 passes through the diffusion layer 14 and is diffused in all directions by the diffusion particles 40.
The viewing angle of the projection screen 1 is increased due to the diffusion of the light. Meanwhile, the coherence of the diffused light rays is weak, so that the interference degree of the light rays on the surface of the projection screen 1 is reduced, and the severity of speckles appearing on the surface of the projection screen 1 is further weakened. The material of the diffusion particles 40 may be Polymethyl Methacrylate (PMMA).
With continued reference to fig. 3, in some embodiments, the projection screen 1 may further include a colored layer 15, with a dark dye distributed within the colored layer 15. Like this, when external environment light when going through tinting layer 15, can be absorbed by the dark colour dyestuff in the tinting layer 15, and then make projection screen 1's anti ambient light ability stronger for projection screen 1 also has better contrast under the stronger environment of light, and the projection picture is better.
Of course dark dyes may be added at other locations as well. As shown in fig. 7, fig. 7 is a schematic structural diagram of another projection screen 1 provided in the embodiment of the present application. A dark dye is added in the reflective layer 13. When ambient light passes through the reflective layer 13, it is absorbed by the dark dye in the reflective layer 13.
It is understood that the materials of the layers of the projection screen 1 can be selected according to the actual situation, and for example, in the case of the projection screen 1 shown in fig. 2, the fresnel lens layer 12, the diffusion layer 14 and the coloring layer 15 can be made of an ultra violet ray (UV) material.
Based on the projection screen 1 shown in fig. 3, the diffusion layer 14 may serve as a substrate for making the fresnel lens layer 12. Taking the example where the fresnel lens layer 12 is cured by UV glue, the UV glue allows the fresnel lens layer 12 to be curled because of its elasticity.
When preparation fresnel lens layer 12, glue the coating with the UV on the surface of diffusion layer 14, then carry out the impression to fresnel lens layer 12 with special mould for fresnel lens layer 12 shaping, then reuse UV light source lamp solidifies UV glue, and the preparation of fresnel lens layer 12 can be accomplished in the drawing of patterns at last. Of course, in other embodiments, the Fresnel lens layer 12 may be made of a heat curable glue.
Similarly, the colored layer 15 may be formed using the diffusion layer 14 as a base. When the colored layer 15 is manufactured, a dark dye is added to the UV glue, and then the UV glue is coated on the surface of the diffusion layer 14 far away from the fresnel lens layer 12, and then the UV glue is cured by a UV light source.
As shown in fig. 7, the surface of the surface layer 11 on the side away from the fresnel lens layer 12 may be a Matte (Matte) surface (i.e., a non-flat surface), and the light reflectivity is low. Therefore, when the light projected by the projector 2 reaches the surface, more light can enter the projection screen 1 through the surface, so that the light projected by the projector 2 is not easy to form a clear image at other places (such as a ceiling), and the viewing experience of the audience 3 is ensured. The surface of the surface layer 11 far away from the fresnel lens layer 12 can be treated by a sand blasting process to form an atomized surface, so that the operation is simple and convenient, and the implementation is easy.
As shown in fig. 8, fig. 8 is a schematic structural diagram of a surface layer 11 according to an embodiment of the present disclosure. In some embodiments, to further enlarge the viewing angle of the projection screen 1, the surface of the surface layer 11 on the side (left side) away from the fresnel lens layer may be distributed with diffusing particles 40. Through adding diffusion particle 40 on this surface, can increase projection screen's the visual angle of watching, also can increase the roughness on this surface simultaneously for more this surface of seeing through of light is difficult to form clear image elsewhere, promotes spectator's viewing experience.
As shown in fig. 9, fig. 9 is a schematic structural diagram of another surface layer 11 provided in the embodiment of the present application. In some embodiments, the surface of the surface layer 11 on the side (left side) away from the fresnel lens layer is distributed with microlenses (Lenti) 50. By providing the micro-lenses 50, the viewing angle of the projection screen can be increased as well, and the effect of reducing the surface reflectivity is achieved. Wherein the shape of the microlens 50 may be a hemisphere.
Referring to fig. 10, fig. 10 is a schematic structural view of the micro-lenses 50 of the surface layer 11 shown in fig. 9 after being subjected to the atomization treatment. In some embodiments, the surface of the microlens 50 may be a fogging surface. Carry out atomization process through the surface to microlens 50, can further improve the roughness on this surface, and then make light further reduce at the reflectivity on this surface to make the transmissivity of light higher, and then improve the utilization efficiency of the light that the projector throws, reduce because of the probability that light reflection formed clear image in other places.
Because the shortest distance between the circle centers of the plurality of fresnel microstructures 121 of the fresnel lens layer 12 and the projection screen 1 is small, the radius of the plurality of fresnel microstructures 121 is relatively small, and the light converging capability is strong. Thus, even if the surface of the surface layer 11 on the side away from the fresnel lens layer 12 is a non-flat surface, good uniformity can be maintained.
In some embodiments, as shown in fig. 7, projection screen 1 may further include a substrate layer 16, and substrate layer 16 may be located between facing layer 11 and reflective layer 13. The substrate layer 16 may serve as a support base for the projection screen 1. Taking the projection screen 1 shown in fig. 7 as an example, the base layer 16 serves as a base for producing the surface layer 11 and the fresnel lens layer 12. When the surface layer 11 is manufactured, the UV glue is coated on the surface of one side, away from the fresnel lens layer 12, of the base material layer 16, and then the UV glue is cured by using a UV light source lamp, so that the surface layer 11 can be manufactured.
Wherein, the substrate layer 16 can be made of different materials. For example, the substrate layer 16 may be made of a Polyethylene terephthalate (PET) material. The PET material is flexible, which in turn allows the substrate layer 16 to be flexible and capable of being rolled. Of course, the substrate layer 16 may be made of other flexible materials, for example, the substrate layer 16 may be made of Thermoplastic polyurethane elastomer (TPU) material, which has elasticity and can achieve curling. Alternatively, the substrate layer 16 may also be made of Styrene Block Copolymers (SBC) flexible materials.
The hardness of the TPU is within the range of light, the hardness is increased, good elasticity and wear resistance can be still maintained, the oil resistance, the aging resistance and the wear resistance are good, and the cost is lower. The SBC material has good flexibility, good mechanical property, waterproofness, strong tensile strength, strong tear strength and strong ball bursting strength. Has better oxidation resistance, water resistance, weather resistance, chemical resistance and corrosion resistance. The material has a rough lower surface, is in a three-dimensional net structure, can have good bonding strength with various adhesives, and can be blended with other materials to improve the performance and strength of the material.
For another example, the base layer 16 may be made of Polyurethane (PU). The PU material is flexible, enabling the projection screen 1 to be rolled. Meanwhile, the PU material can adapt to the adhesion of base materials with different thermal expansion coefficients, a soft-hard transition layer can be formed between the PU material and the base materials, and the adhesion force is strong. Thus, it has better bonding with other layered structures of the projection screen. And has excellent buffering and shock-absorbing functions.
As described above, the reflective layer can reflect light. The reflective material in the reflective layer may also be aluminum, silver, or a combination of silver and aluminum in order to achieve the reflective function of the reflective layer. For better reflection of light, different shapes of materials can be chosen as the material of the reflective layer. In the following, taking the example of selecting aluminum as the reflective material, several different reflective layers provided in the embodiments of the present application will be exemplarily described with reference to the drawings.
In some embodiments, as shown in fig. 11, fig. 11 is a schematic structural diagram of a reflective layer 13 provided in the embodiments of the present application, and in order to improve the gain of the projection screen 1, powdered aluminum powder may be selected and coated on the fresnel lens layer 12 by using a spray printing or evaporation method. Therefore, because the powdered aluminum powder is finer and more delicate and has insignificant directivity, most of the light emitted by the projector can be reflected out of the projection screen directionally according to the arrangement of the microstructure of the fresnel lens layer 12, and the light cannot be reflected around randomly, so that the gain of the projection screen is higher.
Further, when aluminum particles are selected as the reflective material, the diameter of the aluminum particles may range from 5um to 20um. The aluminum particles within this range have a small diameter, and after the reflective layer 13 is formed, the aluminum particles form a dense reflective surface, and when light is irradiated on the reflective surface, the light can be reflected as much as possible, thereby avoiding waste of light energy. Meanwhile, when the aluminum particles are selected as the reflective material, the reflective layer 13 can be made very thin, so that the consumption of the aluminum material can be reduced, and the manufacturing cost can be saved.
In other embodiments, as shown in fig. 12, fig. 12 is a schematic structural diagram of another reflective layer 13 provided in the embodiments of the present application. When the reflective material of the reflective layer 13 is aluminum, a scaly aluminum powder may be selected. The scale-shaped aluminum powder is sprayed on the fresnel lens layer 12 by means of spraying printing. The scaly aluminum powder has larger diameter-thickness ratio, so the bonding capability of aluminum is stronger and the aluminum is not easy to fall off. The ratio of the diameter to the thickness of the flaky aluminum powder may range from (40.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A projection screen is used for reflecting light projected by a projector and is characterized by comprising a surface layer, a Fresnel lens layer and a reflecting layer which are sequentially stacked;
one side of the Fresnel lens layer, which is close to the reflecting layer, is provided with a plurality of Fresnel microstructures which are arranged in the same circle center; the circle centers of the Fresnel microstructures are positioned outside the projection screen;
the projection of the light outlet of the projector on the plane where the projection screen is located on one side, away from the projection screen, of the circle centers of the Fresnel microstructures.
2. The projection screen of claim 1 wherein the projection screen is rectangular in shape; the circle centers of the Fresnel microstructures are positioned on the central axis of the projection screen; and the central axis is vertical to the length direction of the projection screen.
3. The projection screen of claim 2 wherein the projection screen has a diagonal of 80 inches in length; the ratio of the length of the projection screen to the width of the projection screen is 16:9; the shortest distance between the circle centers of the Fresnel microstructures and the projection screen is less than 143mm.
4. The projection screen of claim 2 wherein the projection screen has a diagonal of 100 inches in length; the ratio of the length of the projection screen to the width of the projection screen is 16:9; the shortest distance between the circle centers of the Fresnel microstructures and the projection screen is less than 180mm.
5. The projection screen of claim 2 wherein the projection screen has a diagonal of 120 inches in length; the ratio of the length of the projection screen to the width of the projection screen is 16:9; the shortest distance between the circle centers of the Fresnel microstructures and the projection screen is smaller than 216mm.
6. The projection screen of claim 2 wherein the shortest distance between the center of the plurality of fresnel microstructures and the projection screen is greater than 40mm.
7. A projection device comprising a projector and a projection screen as claimed in claim 2, characterized in that the projector is located on the side of the projection screen where the surface layer is located; the projector is provided with a light outlet; the projection of the light outlet on the plane where the projection screen is located is light source projection; the light source projection is located on the central axis.
8. The projection apparatus of claim 7, wherein a shortest distance between a center of the plurality of Fresnel microstructures and the projection screen is in positive correlation with a shortest distance between the projection of the light source and the projection screen.
9. The projection apparatus of claim 8, wherein a shortest distance between a center of the plurality of fresnel microstructures and the projection screen is less than two-thirds of a shortest distance between a projection of the light source and the projection screen.
10. The projection apparatus of claim 9, wherein a shortest distance between a center of the plurality of fresnel microstructures and the projection screen is greater than two fifths of a shortest distance between the light source projection and the projection screen.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211028191.3A CN115343909A (en) | 2022-08-25 | 2022-08-25 | Projection screen and projection equipment |
| PCT/CN2023/109959 WO2024022515A1 (en) | 2022-07-28 | 2023-07-28 | Projection screen, projection system, die and die master |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211028191.3A CN115343909A (en) | 2022-08-25 | 2022-08-25 | Projection screen and projection equipment |
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| CN115343909A true CN115343909A (en) | 2022-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211028191.3A Pending CN115343909A (en) | 2022-07-28 | 2022-08-25 | Projection screen and projection equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024022515A1 (en) * | 2022-07-28 | 2024-02-01 | 青岛海信激光显示股份有限公司 | Projection screen, projection system, die and die master |
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| JP2010139639A (en) * | 2008-12-10 | 2010-06-24 | Seiko Epson Corp | Reflective screen |
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