CN111929976B - Projection screen and projection system - Google Patents

Projection screen and projection system Download PDF

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Publication number
CN111929976B
CN111929976B CN202011099613.7A CN202011099613A CN111929976B CN 111929976 B CN111929976 B CN 111929976B CN 202011099613 A CN202011099613 A CN 202011099613A CN 111929976 B CN111929976 B CN 111929976B
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layer
projection screen
columnar
microlenses
micro
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CN111929976A (en
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王起飞
张益民
罗坚
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CHENGDU FSCREEN SCI-TECH CO LTD
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CHENGDU FSCREEN SCI-TECH CO LTD
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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
    • 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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

The invention provides a projection screen and a projection system, and belongs to the field of projection display. A projection screen comprises a columnar micro-lens layer, a first substrate layer and a reflection micro-structural layer, wherein the columnar micro-lens layer is arranged along the thickness direction of the projection screen, comprises a columnar micro-lens layer I and a columnar micro-lens layer II and is arranged on one side of the first substrate layer; the columnar microlens layer I comprises a plurality of vertical columnar microlenses, and the height-width ratios of the vertical columnar microlenses arranged from the center axis to the two ends of the projection screen are gradually reduced; the cylindrical micro-lens layer II comprises a plurality of transverse cylindrical micro-lenses, and the aspect ratio of the transverse cylindrical micro-lenses is gradually reduced from one side to the other side along the vertical direction of the projection screen; the reflecting microstructure layer is provided with a plurality of microstructures, and the microstructures are arc-shaped, parabolic, elliptical or linear. The projection system comprises a projector and the projection screen. The invention improves the brightness uniformity of the projection screen and the projection system.

Description

Projection screen and projection system
Technical Field
The invention belongs to the technical field of projection display, and particularly relates to a projection screen and a projection system.
Background
The projection display needs a projector and a projection screen, the projection screen is used for imaging an image sent by the projector and redistributing the projection light intensity, and the redistribution of the projection light intensity by the projection screen needs to depend on various fine structures on the screen to diffuse and converge projection light or control the transmission direction of the light according to needs so as to meet the requirements of different viewing fields. The existing projection screen has a wide problem that the brightness displayed on the screen is different greatly at different viewing positions, unlike the LCD or LED screen, which does not have a large difference in display brightness within a large viewing field range, so one of the differences between the projection screen and the LCD or LED screen is that the brightness experienced by the viewer is not uniform under different viewing fields on the projection screen, which greatly affects the visual experience of the viewer.
Generally, a projection screen is provided with vertically-connected and arranged columnar lenses with the same size to diffuse light of a projector, so that better brightness uniformity is expected to be obtained in the horizontal direction of the projection screen, for example, a patent document with the domestic patent application publication number of CN107102508A describes that a connected columnar lens with the same size is used for diffusing light of the projector, as shown in fig. 1, the principle that the vertically-connected and arranged columnar lenses with the same size have the same horizontal diffusion capability in each position on the screen is utilized to realize diffusion distribution of light intensity in the horizontal direction of the projection screen. But generally one of the ways in which the intensity of light emitted by the projector is distributed at various positions on the projection screen is a phenomenon that the middle portion is stronger than the two side portions, the intensity distribution of the light emitted by the projector is not itself the same at every location on the projection screen, the loss of the projection light rays incident at different angles at various positions of the projection screen is also different, and the light rays converged by other optical microstructures on the projection screen also cause uneven distribution of light intensity on the projection screen, while the sizes in the previous examples are the same and the diffusion capacities of the consecutively arranged lenticular lenses are the same at each position, it does not improve the problem of uneven brightness of the projector itself, and also makes the distribution of light intensity on the projection screen more uneven, the image display of the projection screen of the prior art may present the problem of uneven brightness with bright middle and dark sides.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a projection screen, which solves the problem of uneven intensity of the displayed image of the projection screen caused by uneven light intensity distribution of the light source in the conventional projection screen.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
a projection screen comprises a columnar micro-lens layer, a first substrate layer and a reflection micro-structural layer, wherein the columnar micro-lens layer is arranged in the thickness direction of the projection screen and is arranged on one side of the first substrate layer; the columnar microlens layer I comprises a plurality of vertical columnar microlenses, the height-width ratios of the vertical columnar microlenses arranged along the transverse direction of the projection screen towards two ends are gradually reduced by taking a central shaft as a reference, the central shaft is a symmetry axis of the vertical columnar microlenses with the maximum height-width ratio in the columnar microlens layer I, and the height-width ratio of the vertical columnar microlenses = the height of the vertical columnar microlenses/the width of the vertical columnar microlenses; the cylindrical microlens layer II comprises a plurality of transverse cylindrical microlenses, the height-to-width ratio of the transverse cylindrical microlenses is gradually reduced from one side to the other side along the vertical direction of the projection screen, and the height-to-width ratio of the transverse cylindrical microlenses is equal to the height of the transverse cylindrical microlenses/the width of the transverse cylindrical microlenses; the reflecting microstructure layer is provided with a plurality of microstructures, and the extending direction or edge profile of each microstructure forms an arc shape, a parabola shape, an ellipse shape or a straight line shape.
As an optional mode, the cross section of the vertical columnar microlens in the transverse direction of the projection screen is in a shape formed by connecting at least three line segments end to end, or a shape formed by connecting at least two curves end to end, or a shape formed by connecting at least one line segment and at least one curve end to end; the cross section of the transverse columnar micro lens in the vertical direction of the projection screen is in a shape formed by connecting at least three line segments end to end or a shape formed by connecting at least two curves end to end or a shape formed by connecting at least one line segment and at least one curve end to end.
As an optional mode, the cross section of the microstructure in the vertical direction of the projection screen is in a shape formed by connecting at least three line segments end to end, or in a shape formed by connecting at least two curves end to end, or in a shape formed by connecting at least one line segment and at least one curve end to end.
As an alternative, the vertical columnar microlenses and the horizontal columnar microlenses are both provided with diffusing particles therein.
As an alternative, light absorbing materials are disposed in both the vertical cylindrical microlenses and the horizontal cylindrical microlenses.
As an optional mode, the reflective microstructure layer is disposed on a side of the first substrate layer away from the pillar microlens layer, and a surface of the pillar microlens layer away from the first substrate layer is a rough surface.
As an optional mode, the surface of one side, away from the cylindrical microlens layer, of the first substrate layer is a rough surface; one side of the columnar microlens layer, which is far away from the first substrate layer, is provided with a filling resin material layer for filling the columnar microlens layer, and the reflection microstructure layer is connected with the columnar microlens layer through the filling resin material layer.
As an alternative, the surface of the side of the lenticular microlens layer away from the first substrate layer is a rough surface.
As an optional mode, the projection screen further includes a second substrate layer, and the second substrate layer is disposed on one side of the reflective microstructure layer close to the lenticular microlens layer.
As an optional mode, a reflective layer having a specular reflection function or a diffuse reflection function is disposed on a side of the reflective micro-structural layer away from the cylindrical micro-lens layer.
As an optional mode, the projection screen further comprises a black back plate and a decorative frame, the black back plate is arranged on one side of the reflection layer far away from the cylindrical micro-lens layer, and the decorative frame wraps the periphery of the projection screen.
As an optional mode, the projection screen further includes a magnetic material or a suspension member, and is disposed on a side of the black back plate away from the lenticular microlens layer.
Based on the projection screen, the invention also provides a projection system, which solves the problem of uneven display brightness distribution caused by strong middle and weak two sides of the distribution of the light intensity of the projector (light source) on the projection screen, strong area close to the projector (light source) and weak area far away from the projector (light source).
The projection system provided by the embodiment of the invention comprises the projector and the projection screen.
The invention has the following beneficial effects:
the projection screen has the advantages that the cylindrical micro-lens layer I formed by the vertical cylindrical micro-lenses is arranged, so that the diffusion of the middle light intensity of a light source emitted by the projector is increased in a targeted manner, the diffusion capability of the light intensities on two sides is reduced, the middle brightness of the projection screen is reduced, the brightness on two sides is increased, and the middle brightness of the projection screen is close to or the same as the brightness on two sides; through the arrangement of the columnar micro-lens layer II formed by the plurality of transverse columnar micro-lenses, light intensity in a region close to the projector (light source) is more distributed to a region far away from the projector, so that the brightness of the region of the projection screen close to the projector (light source) is reduced, the brightness of the region far away from the projector (light source) is increased, and the brightness of the region close to the light source of the projection screen is close to or the same as the brightness of the region far away from the light source; further, the display brightness uniformity effect of the whole projection system is improved.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a schematic view of a prior art projection screen;
FIG. 2 is a schematic structural diagram of a projection screen according to a first embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a vertical cylindrical microlens in a projection screen according to a first embodiment of the present invention;
FIG. 4 is a schematic diagram of four structures of a lenticular microlens layer according to a first embodiment of the present invention;
fig. 5 is a schematic diagram of a cylindrical microlens layer i formed by vertical cylindrical microlenses for adjusting light intensity distribution according to a first embodiment of the present invention;
FIG. 6 is a schematic diagram of adjusting the light intensity distribution of a cylindrical microlens layer II formed by transverse cylindrical microlenses according to a first embodiment of the present invention;
FIG. 7 is a schematic view of a reflective microstructure layer according to a first embodiment of the present invention;
FIG. 8 is a diagram illustrating a test of the light diffusion capability of a projection screen according to a first embodiment of the present invention;
FIG. 9 is a graph comparing the light intensity spreading capability of a projection screen according to a first embodiment of the present invention with that of a projection screen according to a prior art;
FIG. 10 is a schematic diagram of a projection screen according to a second embodiment of the present invention, in which diffusing particles and/or light absorbing materials are disposed on a lenticular layer;
FIG. 11 is a schematic structural diagram of a projection screen according to a third embodiment of the present invention;
FIG. 12 is a schematic structural diagram of a projection screen according to a fourth embodiment of the present invention;
FIG. 13 is a schematic structural diagram of a projection screen according to a fifth embodiment of the present invention;
FIG. 14 is a schematic structural diagram of a projection screen according to a sixth embodiment of the present invention;
FIG. 15 is a schematic structural diagram of a projection screen according to a seventh embodiment of the present invention;
fig. 16 is a schematic structural diagram of a projection screen according to an eighth embodiment of the present invention;
FIG. 17 is a schematic structural diagram of a projection screen according to a ninth embodiment of the present invention;
FIG. 18 is a side view of a projection screen according to a tenth embodiment of the invention;
FIG. 19 is a side view of a projection screen according to eleventh embodiment of the present invention;
FIG. 20 is a schematic diagram of optical path transmission of a projection system according to a twelfth embodiment of the present invention;
icon: 10-a projection screen; 20-a projection system; 101-a lenticular microlens layer; 102-a first substrate layer; 103-a reflective microstructure layer; 104-a second substrate layer; 105-leveling the resin material layer; 106-a reflective layer; 107-black back panel; 108-decorative border; 109-hanging parts; 1011-vertical cylindrical microlenses; 1021-lateral cylindrical microlenses; 1012-rough surface; 1031-microstructure; 1032-a first main reflective surface; 1033-a second main reflective surface; 1034-diffusion particles; 1035-light absorbing material; t-height, P-width; a Z-center axis; g-incident light; a Y-projector; m-luminance meter.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, the terms "lateral", "vertical", "one side", "the other side", "one side", and "the other side" are to be construed broadly unless otherwise specifically defined and limited. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example one
As shown in fig. 2, a projection screen includes a lenticular microlens layer 101, a first substrate layer 102, and a reflective microstructure layer 103 disposed along a thickness direction of the projection screen, the lenticular microlens layer 101 being disposed on one side of the first substrate layer 102. The cylindrical micro-lens layer 101 comprises a cylindrical micro-lens layer I and a cylindrical micro-lens layer II, the cylindrical micro-lens layer I comprises a plurality of vertical cylindrical micro-lenses 1011, the height-to-width ratio of the vertical cylindrical micro-lenses 1011 arranged along the transverse direction of the projection screen towards two ends is gradually reduced by taking a central axis Z as a reference, and the central axis Z is the symmetry axis of the vertical cylindrical micro-lenses 1011 of which the height-to-width ratio is the maximum value in the cylindrical micro-lens layer I; the lenticular layer ii includes a plurality of transverse lenticular microlenses 1021, and the aspect ratio of the transverse lenticular microlenses 1021 decreases gradually from one side to the other side along the vertical direction of the projection screen 10. When the widths of the vertical cylindrical microlens 1011 and the horizontal cylindrical microlens 1021 are both P, and the heights of the vertical cylindrical microlens 1011 and the horizontal cylindrical microlens 1021 are both T, the aspect ratio of the vertical cylindrical microlens 1011 is the ratio of the height of the vertical cylindrical microlens 1011 to the width of the vertical cylindrical microlens 1011, that is, the aspect ratio of the vertical cylindrical microlens 1011 = T/P, and the aspect ratio of the horizontal cylindrical microlens 1021 is the ratio of the height of the horizontal cylindrical microlens 1021 to the width of the horizontal cylindrical microlens 1021, that is, the aspect ratio of the horizontal cylindrical microlens 1021 = T/P. The reflective microstructure layer 103 is provided with a plurality of microstructures 1031, and the microstructures 1031 may be circular arc microstructures, parabolic microstructures, elliptical microstructures, or linear microstructures; the microstructure 1031 includes two main reflective surfaces, a first main reflective surface 1032 and a second main reflective surface 1033.
By way of further explanation, by providing a cylindrical microlens layer i including a plurality of vertical cylindrical microlenses 1011 (the aspect ratio of the vertical cylindrical microlenses 1011 disposed in the direction of both ends in the transverse direction of the projection screen gradually decreases from the central axis Z as a reference) and a cylindrical microlens layer ii including a plurality of transverse cylindrical microlenses 1021 (the aspect ratio of the transverse cylindrical microlenses 1021 gradually decreases from one side to the other side in the vertical direction of the projection screen 10), the variation of the aspect ratio of the vertical cylindrical microlenses 1011 and the aspect ratio of the transverse cylindrical microlenses 1021 can be controlled, so that the diffusion capability of the vertical cylindrical microlenses 1011 and the transverse cylindrical microlenses 1021 can be effectively reduced, and the arbitrary control of the light intensity distribution at different positions can be realized, and the viewer can obtain a more uniform brightness distribution viewing angle effect at any position. The height-width ratio of the vertical columnar micro lens 1011 and the height-width ratio of the transverse columnar micro lens 1021 are specifically set according to actual brightness differences of different positions on an actual projector (light source) and a projection screen, so that light intensity in the middle of the projection screen diffuses towards two sides, the light intensity of the projection screen close to the light source diffuses and distributes towards the position far away from the light source, and uniform light intensity distribution of each position on the projection screen is realized.
As a further explanation, the expressions that the aspect ratio of the vertical cylindrical microlens 1011 is gradually decreased and the aspect ratio of the horizontal cylindrical microlens 1021 is gradually decreased should be understood in a broad sense, and the specific decrease needs to be set according to the light intensity distribution of the matched light source, and may be a decrease in continuity, a decrease in discontinuous intervals, or a decrease in steps. For example, in the plurality of vertical cylindrical microlenses 1011 in the cylindrical microlens layer i, the aspect ratios of the vertical cylindrical microlenses 1011 in a certain region are the same, the aspect ratios of the vertical cylindrical microlenses 1011 in the next region are the same, but the aspect ratios of the vertical cylindrical microlenses 1011 in the two regions are different, and the characteristics of regional reduction are presented.
As a further explanation, in the lenticular microlens layer i, the aspect ratio of the vertical lenticular microlenses 1011 disposed along the transverse direction of the projection screen toward both ends is gradually reduced with respect to the central axis Z, and may be symmetrically reduced from the central axis Z toward both ends; or a reduced asymmetric reduction with a much larger reduction on one side and a reduced reduction on the other side, which can be used for the adjustment of the light intensity in the presence of a distribution of the light intensity that is not uniformly distributed across both sides.
Further, the expression of the central axis Z should be understood in a broad sense, which refers to the symmetry axis of the vertical cylindrical microlens 1011 with the maximum aspect ratio in the cylindrical microlens layer i, it is understood that the vertical cylindrical microlens 1011 with the maximum aspect ratio is not necessarily located at the center of the cylindrical microlens layer i, and it is determined according to the intensity of the light intensity distribution, if the light intensity distribution is characterized by the strongest center, the vertical cylindrical microlens 1011 with the maximum aspect ratio is located at the center of the cylindrical microlens layer i, but if the light intensity distribution is not characterized by the strongest center, the vertical cylindrical microlens 1011 with the maximum aspect ratio is not located at the center of the cylindrical microlens layer i, so the central axis Z is not necessarily the central axis of the cylindrical microlens layer i. In addition, when the distribution of the vertical columnar microlenses is a step-like distribution, the columnar microlens having the largest aspect ratio may be a plurality of connected microlenses, and the central axis Z shall mean a common central axis of symmetry of all vertical columnar microlenses 1011 having the same ratio in a region where the ratio of the height to the width of the vertical columnar microlens 1011 is the largest.
As a further explanation, the vertical cylindrical microlenses 1011 on the cylindrical microlens layer i and the horizontal cylindrical microlenses 1021 on the cylindrical microlens layer ii may be arranged in an interconnected manner, or may be arranged at a certain distance, and may be arranged densely in the region with strong light intensity distribution, sparsely arranged in the region with weak light intensity distribution, or not arranged, so as to diffuse the intensity of the region with strong light intensity to the region with weak light intensity, and diffuse less or not in the region with weak light intensity, so as to obtain the overall brightness uniformity effect.
It should be added that, in the cylindrical microlens layer i, with the central axis Z as a reference, the aspect ratio of the vertical cylindrical microlenses 1011 disposed along the transverse direction of the projection screen toward both ends is gradually reduced, and the ratio thereof can be reduced to zero, that is, the height T of the vertical cylindrical microlenses 1011 can be reduced to zero, that is, a plane is formed at the edge of the cylindrical microlens layer i. This arrangement is used to diffuse the light intensity in a partial region near the central axis Z of the projection screen 10, and the light intensity does not need to be diffused at a certain position on both sides. In addition, the projection screen of the invention can be correspondingly provided with the height and the width of the vertical columnar micro lens according to the light intensity distribution of different positions of the light source, the height-width ratio of the vertical columnar micro lens 1011 is large for the position with strong light intensity distribution, and the height-width ratio of the vertical columnar micro lens 1011 is small under the opposite condition.
It should be noted that, in the lenticular layer ii, the aspect ratio of the lateral lenticular microlenses 1021 decreases gradually from side to side in the vertical direction of the projection screen 10, and the ratio may also decrease to zero, that is, the height T of the lateral lenticular microlenses 1021 may decrease to zero, i.e., a plane is formed at the edge of the lenticular layer ii. This arrangement is used to diffuse the light intensity in the region of the projection screen 10 near the light source, and away from the projector, where the light intensity need not be diffused. In addition, the projection screen of the present invention may be configured with the height and width of the lateral lenticular lens 1021 correspondingly according to the light intensity distribution of different positions of the light source, and the ratio of the height to the width of the lateral lenticular lens 1021 is large for the position of the light intensity distribution, and on the contrary, the ratio of the height to the width of the lateral lenticular lens 1021 is small.
It should be further noted that, in the lenticular layer ii, the aspect ratio of the lateral lenticular microlenses 1021 decreases gradually from one side to the other side along the vertical direction of the projection screen 10, where (also including the following description) the "one side" refers to a position close to the light source, and the corresponding "other side" refers to a position away from the light source, specifically, the lateral lenticular microlenses 1021 with a large aspect ratio must be closer to the light source than the lateral lenticular microlenses 1021 with a small aspect ratio, which is favorable for the projection screen to diffuse a place where the light intensity distribution of the light source is strong.
Alternatively, as shown in fig. 3, the cross-sectional view of the vertical cylindrical microlens 1011 is taken along the transverse direction of the projection screen 10. As shown in fig. 3a, the cross section of the vertical cylindrical microlens 1011 in the transverse direction of the projection screen 10 is a triangle, that is, a figure formed by three line segments connected end to end; as shown in fig. 3b, the cross section of the vertical cylindrical microlens 1011 in the transverse direction of the projection screen 10 is a trapezoid, and of course, the vertical cylindrical microlens may be another figure formed by four line segments connected end to end; as shown in fig. 3c, the cross section of the vertical cylindrical microlens 1011 in the transverse direction of the projection screen 10 is a figure formed by connecting two curves end to end, and of course, may also be a figure formed by connecting a plurality of curves end to end; as shown in fig. 3d, the cross section of the vertical cylindrical microlens 1011 in the transverse direction of the projection screen 10 is a graph formed by connecting a line segment and a curve end to end; as shown in fig. 3e, the cross section of the vertical cylindrical microlens 1011 in the transverse direction of the projection screen 10 is a figure formed by connecting three line segments and one curve end to end. Of course, the cross section of the vertical cylindrical microlens 1011 in the transverse direction of the projection screen 10 may also be a pattern formed by connecting a plurality of straight lines and a plurality of curves end to end, which is not mentioned here.
As a further explanation, the cross sections of the vertical columnar microlenses 1011 constituting the columnar microlens layer i in the lateral direction of the projection screen may be the same, may be different, or may be partially the same. That is, the shape of each vertical columnar microlens 1011 constituting the columnar microlens layer i may be any one of the above cross sections, or may be a combination of at least two patterns of the above cross sections.
As a further supplementary explanation, in the lenticular layer ii, the cross section of the lateral lenticular microlenses 1021 in the vertical direction of the projection screen 10 is similar to the cross section of the vertical lenticular microlenses 1011 in the lenticular layer i in the lateral direction of the projection screen 10, and the cross-sectional shape and the like are also similar.
Alternatively, the vertical cylindrical microlenses 1011 and the horizontal cylindrical microlenses 1021 are arc cylindrical microlenses, and the changes in the aspect ratios of the vertical cylindrical microlenses 1011 and the horizontal cylindrical microlenses 1021 in the cylindrical microlens layer 101 are represented by the cylindrical microlens layer 101 formed by the cylindrical microlens layer i composed of the vertical cylindrical microlenses 1011 and the cylindrical microlens layer ii composed of the horizontal cylindrical microlenses 1021. Fig. 4 is a schematic diagram showing four structures of the lenticular microlens layer. As shown in fig. 4a, the lenticular layer includes a lenticular layer i composed of vertical lenticular microlenses 1011 and a lenticular layer ii composed of horizontal lenticular microlenses 1021; with the central axis Z as a reference (with the central axis Z not at the center of the physical dimension of the cylindrical microlens layer i), the height T of the vertical cylindrical microlens 1011 gradually decreases from the transverse direction of the projection screen to the two ends, and the width P of the vertical cylindrical microlens 1011 remains unchanged; the height T of the lateral lenticular microlenses 1021 gradually decreases from side to side in the vertical direction of the projection screen 10, and the width P of the lateral lenticular microlenses 1021 remains constant. As shown in fig. 4b, the lenticular layer includes a lenticular layer i composed of vertical lenticular microlenses 1011 and a lenticular layer ii composed of horizontal lenticular microlenses 1021; with the central axis Z as a reference, the height T of the vertical cylindrical microlens 1011 gradually decreases toward both ends along the transverse direction of the projection screen, and the width P of the vertical cylindrical microlens 1011 gradually increases toward both ends along the transverse direction of the projection screen; the height T of the lateral lenticular microlenses 1021 decreases gradually from one side to the other side in the vertical direction of the projection screen 10, and the width P of the lateral lenticular microlenses 1021 increases gradually from one side to the other side in the vertical direction of the projection screen 10. As shown in fig. 4c, the lenticular layer includes a lenticular layer i composed of vertical lenticular microlenses 1011 and a lenticular layer ii composed of horizontal lenticular microlenses 1021; with the central axis Z as a reference, the height T of the vertical cylindrical microlens 1011 gradually decreases toward both ends along the transverse direction of the projection screen, the width P of the vertical cylindrical microlens 1011 also gradually decreases toward both ends along the transverse direction of the projection screen, but the height variation of the vertical cylindrical microlens 1011 is greater than the width variation; the height T of the lateral lenticular microlenses 1021 decreases gradually from one side to the other side in the vertical direction of the projection screen 10, and the width P of the lateral lenticular microlenses 1021 also decreases gradually from one side to the other side in the vertical direction of the projection screen 10, but the amount of change in the height of the lateral lenticular microlenses 1021 is greater than the amount of change in the width. As shown in fig. 4d, the lenticular layer includes a lenticular layer i composed of vertical lenticular microlenses 1011 and a lenticular layer ii composed of horizontal lenticular microlenses 1021; with the central axis Z as a reference, the height T of the vertical cylindrical microlens 1011 remains unchanged, and with the central axis Z as a reference, the width P of the vertical cylindrical microlens 1011 gradually increases toward both ends along the transverse direction of the projection screen; the height T of the lateral lenticular microlenses 1021 remains constant, and the width P of the lateral lenticular microlenses 1021 also gradually increases from side to side in the vertical direction of the projection screen 10.
It should be noted that, although only some embodiments of the lenticular microlens layer 101 of the projection screen are described above, there are many embodiments that satisfy the aspect ratio change of the vertical lenticular microlenses 1011 and the horizontal lenticular microlenses 1021 in the lenticular microlens layer, and the embodiments are not limited to the above four cases. The idea of controlling the light intensity distribution by changing the aspect ratio of the vertical cylindrical microlens 1011 and the lateral cylindrical microlens 1021 falls within the scope of the present invention.
To explain further, in addition to the above-mentioned two-layer structure of the lenticular microlens layer, the lenticular microlens layer may be a three-layer laminate, a four-layer laminate, or a five-layer laminate … …, as long as the lenticular microlens layer includes at least one lenticular microlens layer i and at least one lenticular microlens layer ii, and the composition and arrangement of the lenticular microlens layer i and the lenticular microlens layer ii satisfy the above requirements. It should be further noted that, the larger the number of the columnar microlens layer stacks, the stronger the adjustment effect on the uniformity of the light intensity distribution, but it should be noted that an excessive number of the layer stacks may cause a loss of the light intensity, and therefore, it is necessary to select an appropriate number of the layer stacks based on the comprehensive evaluation of the uniformity of the luminance and the display luminance.
In addition, the columnar microlens layer I and the columnar microlens layer II of the columnar microlens layer can be orthogonally laminated; or non-orthogonal lamination, namely, the columnar microlens layer I and the columnar microlens layer II are laminated at a certain angle. Generally, it is preferable that the columnar microlens layer I and the columnar microlens layer II are orthogonally laminated.
Further, as shown in fig. 5, a schematic diagram of the cylindrical microlens layer i formed by the vertical cylindrical microlenses 1011 for adjusting the light intensity distribution is shown. Incident light rays G incident to the vertical cylindrical micro lenses 1011 of the central axis in the cylindrical micro lens layer I are refracted on the arc-shaped surfaces of the vertical cylindrical micro lenses 1011, because the aspect ratio of the vertical cylindrical micro lenses 1011 of the central axis is larger than that of the vertical cylindrical micro lenses 1011 at the two transverse end edges, the curvature radius of the vertical cylindrical micro lenses 1011 of the central axis is relatively smaller, an included angle formed by the incident light rays G in the same direction and the curvature radius (the circle center is O2) of the vertical cylindrical micro lenses 1011 of the central axis is larger, namely, the light ray incident angle with the vertical cylindrical micro lenses 1011 of the central axis is larger, so that the refraction angle theta 1 of the light rays refracted and emitted from the vertical cylindrical micro lenses 1011 of the central axis is larger than the refraction angle theta 2 of the light rays refracted and emitted from the vertical cylindrical micro lenses 1011 (the circle center is O1) at the two transverse end edges, namely, the deflection effect of the vertical cylindrical micro lenses 1011 of the central axis on the emitted light rays is more obvious, therefore, the light intensity redistribution capability is stronger, the deflection effect of the vertical cylindrical micro lenses 1011 at the edges of the two transverse ends on emergent light is very weak, and when the height of the vertical cylindrical micro lenses 1011 becomes zero, the light intensity distribution state is basically not changed, so that the light intensity distribution regulation effect is realized through the principle.
Further, fig. 6 is a schematic diagram of the cylindrical microlens layer ii composed of the lateral cylindrical microlenses 1021 for adjusting the light intensity distribution. The aspect ratio of the transverse cylindrical microlens 1021 on one side of the cylindrical microlens layer II is greater than that of the transverse cylindrical microlens 1021 on the other side, and the incident light ray G incident on the transverse cylindrical microlens 1021 with a large aspect ratio is refracted on the arc surface of the transverse cylindrical microlens 1021, so that the curvature radius of the transverse cylindrical microlens 1021 with a large aspect ratio is relatively small, the included angle formed by the incident light ray G in the same direction and the curvature radius (with the center of the circle being O4) of the transverse cylindrical microlens 1021 with a large aspect ratio is large, that is, the incident angle of the light ray with the transverse cylindrical microlens 1021 with a large aspect ratio is larger, so that the refraction angle theta 3 of the light ray refracted from the transverse cylindrical microlens 1021 with a large aspect ratio is larger than the refraction angle theta 4 of the light ray refracted from the transverse cylindrical microlens 1021 with a small aspect ratio (with the center being O3), that is, the transverse cylindrical microlens 1021 with a large aspect ratio has a more obvious deflecting effect on the emergent light, therefore, the light intensity redistribution capability is stronger, the deflection effect of the transverse columnar microlens 1021 with a small height-to-width ratio on emergent light is very weak, and when the height of the transverse columnar microlens 1021 becomes zero, the light intensity distribution state is basically not changed, so that the light intensity distribution regulation effect is realized through the principle.
Therefore, the light intensity at any position on the columnar microlens layer can be adjusted to the most balanced state by adjusting the vertical direction and the horizontal direction of the light intensity distribution.
Further, the materials of the vertical cylindrical microlenses 1011 and the horizontal cylindrical microlenses 1021 include, but are not limited to, radiation-curable resin, thermosetting resin, reactive-type curable resin, transparent glass, transparent ceramic, etc., and the method for manufacturing the vertical cylindrical microlenses 1011 and the horizontal cylindrical microlenses 1021 using the above raw materials is to transfer and coat the raw materials onto a base material by using a roller mold with a cylindrical microlens structure; the method for manufacturing the vertical cylindrical microlenses 1011 and the horizontal cylindrical microlenses 1021 by using transparent glass or transparent ceramic is to form the vertical cylindrical microlenses 1011 and the horizontal cylindrical microlenses 1021 on the glass or ceramic by tool engraving, laser engraving, or chemical etching.
By way of further illustration, the first substrate layer 102 may be made of materials including, but not limited to, flexible plastic or rubber materials such as polyethylene, polypropylene, polystyrene, polyvinyl chloride, casein phosphopeptide, biaxial polypropylene, polycarbonate, polyethylene terephthalate, polyamide, polyurethane, polymethyl methacrylate, polycarbonate, thermoplastic polyurethane elastomer, or transparent substrates with certain rigidity such as glass, acrylic, ceramic, etc.
Further, the first substrate layer 102 may be colored by a gray dye/pigment, so that the transmittance of the first substrate layer 102 is properly reduced to adjust the overall appearance color of the projection screen, increase the absorption of ambient light, and improve the contrast of the projection screen.
Alternatively, a schematic view of a reflective microstructure layer is shown in fig. 7. The reflective microstructure layer is provided with microstructures 1031, as shown in fig. 7a, each microstructure 1031 is an arc-shaped microstructure, and the extending direction or edge profile of the microstructure 1031 forms an arc shape; as shown in fig. 7b, each of the microstructures 1031 is an elliptical arc-shaped microstructure, and the extending direction or edge profile of the microstructures 1031 forms an elliptical arc shape; as shown in fig. 7c, each of the microstructures 1031 is a parabolic microstructure, and the extending direction or edge profile of the microstructures 1031 forms a parabolic shape; as shown in fig. 7d, each of the microstructures 1031 is a linear microstructure, and the extending direction or edge profile of the microstructures 1031 forms a linear shape; the microstructures 1031 may be provided in other shapes in addition to the above four cases.
To explain further, the overall shape of the microstructure 1031 may have a certain center, such as a circular arc microstructure shown in fig. 7a, an elliptical arc microstructure shown in fig. 7b, or a parabolic microstructure shown in fig. 7c, which may be set within the size range of the projection screen or outside the size range of the projection screen; the overall shape of the microstructures 1031 may also be a straight-line microstructure without a center as shown in fig. 7d, and the straight-line microstructures may be arranged in a horizontal direction as shown in fig. 7d, a vertical direction, or an inclined angle.
Further, a cross section of the microstructure 1031 in the vertical direction of the projection screen may be a shape formed by connecting at least three line segments end to end, may be a shape formed by connecting at least two curves end to end, and may be a shape formed by connecting at least one line segment and at least one curve end to end; that is, the cross section of the microstructure 1031 in the vertical direction of the projection screen is similar to the cross section of the vertical cylindrical microlens 1011 in the horizontal direction of the projection screen 10.
The projection screen of the embodiment of the invention and the projection screen in the prior art are tested, and the specific test process is as follows:
FIG. 8 is a diagram illustrating a test of the diffusion capability of the projection screen to the light intensity according to an embodiment of the present invention. A rectangular projection screen is used as a sample 1, and the projection screen in this embodiment is used as the sample 1. Taking 9 test points from the sample 1, namely, a test point, a test. (III), III and III are on the same horizontal line, and (IV), (V) and (IV) are on the same horizontal line, and (V), (V) and (III) are on the same horizontal line, and take a central axis Z as a center, wherein (V), (V) and (V) the distances between the six test point positions and the line segment at the extreme edge are 1/6 corresponding to the side length, and (V), (V) and (V) are located on the central axis Z, wherein (V) is located at the center of the whole sample 1. The specific test method comprises the following steps: the projector Y (as a light source) with oblique incidence is used for projecting light to be incident on the sample 1, the luminance meter M is positioned at the position 3 meters right in front of the sample 1, the center of the lens of the initial luminance meter is vertically aligned with the central point of the sample 1, the position of the luminance meter is kept unchanged when other points are tested, and the central axis of the lens of the luminance meter M is aligned with each point by rotating the luminance meter M.
A prior art projection screen of exactly the same size as sample 1 was taken as sample 2 and marked accordingly. The test environments for the two samples were controlled to be the same, and the brightness values of 9 points on sample 1 and sample 2 were measured at different illumination values, respectively, and recorded to obtain the brightness test data shown in table 1.
TABLE 1 Brightness test data for 9 spots for two samples
Figure 947247DEST_PATH_IMAGE001
As can be seen from the data in table 1, the illuminance of the light projected by the projector Y at each position is an uneven state where the middle is bright and both sides are dark, and the closer the light source is, the brighter the light source is, and the farther the light source is, the darker the light source is, so that the sample 1 (the projection screen of this embodiment) can improve the problem of uneven brightness of the light source itself, and obtain an even brightness display effect.
A comparison of the light intensity diffusion capability of the projection screen of the present invention (sample 1) and the projection screen of the prior art (sample 2) as shown in fig. 9 can be obtained from the data of table 1. It can be seen that, by combining fig. 9 and table 1, after the projection screen (sample 2) of the prior art diffuses the light intensity, the problem that the brightness is not uniform is obviously existed in the middle of bright (c), bright (c) and bright (b), the edge of bright (c), dark (c) and bright (c), and the brightness of three points close to the light source is higher than that of three points far away from the light source (c), bright (b) and bright (c). The scheme of the embodiment of the invention can reduce the brightness of the middle area, increase the brightness of the edge area, reduce the brightness of the area close to the light source and increase the brightness of the area far away from the light source of the projection screen, and the brightness of the middle and the edge of the projection screen, the area close to the light source and the area far away from the light source are closer by comprehensive adjustment, so that the excellent uniform effect of display brightness is finally obtained at each position on the projection screen. In addition, the technical scheme of the invention can well optimize the problem of nonuniform brightness of the projector (used as a light source) and obtain better brightness uniformity effect by matching.
Example two
On the basis of the first embodiment, as shown in fig. 10, diffusing particles and/or light absorbing materials are disposed on the pillar microlens layer.
As shown in fig. 10a, the lenticular layer includes a lenticular layer i composed of a plurality of vertical lenticular microlenses 1011 and a lenticular layer ii composed of a plurality of horizontal lenticular microlenses 1021, wherein the vertical lenticular microlenses 1011 and the horizontal microlenses 1021 are both provided with diffusing particles 1034, and the diffusing particles 1034 can uniformly scatter light passing through the lenticular layer, thereby further making the light intensity distribution more uniform. The diffusion particles 1034 include, but are not limited to, silica particles, alumina particles, titania particles, ceria particles, zirconia particles, tantalum oxide particles, zinc oxide particles, magnesium fluoride particles, and the like, and the particle diameter thereof is preferably 5nm to 200 nm.
It should be noted that the cylindrical microlens layer of the present invention mainly depends on the change of the lens structure itself to realize the diffusion adjustment function of light, so that no diffusion particles may be disposed in the vertical cylindrical microlens 1011 and the horizontal cylindrical microlens 1021, or only diffusion particles may be disposed in the vertical cylindrical microlens 1011/the horizontal cylindrical microlens 1021, and a good light diffusion effect can be obtained. When the diffusion particles 1034 are disposed in the vertical cylindrical microlenses 1011 and the horizontal cylindrical microlenses 1021, the diffusion particles 1034 may be uniformly distributed in the vertical cylindrical microlenses 1011 and the horizontal cylindrical microlenses 1021, or may be non-uniformly distributed in the vertical cylindrical microlenses 1011 and the horizontal cylindrical microlenses 1021, and in order to achieve the best effect, the mode in which the diffusion particles 1034 are uniformly distributed in the vertical cylindrical microlenses 1011 and the horizontal cylindrical microlenses 1021 is preferred.
As shown in fig. 10b, the lenticular layer includes a lenticular layer i composed of a plurality of vertical lenticular microlenses 1011 and a lenticular layer ii composed of a plurality of horizontal lenticular microlenses 1021, wherein light absorbing materials 1035 are disposed in the vertical lenticular microlenses 1011 and the horizontal microlenses 1021, and the light absorbing materials 1035 can absorb some unwanted light and selectively transmit the wanted light. Here, the light absorbing material 1035 includes, but is not limited to, various pigments, dyes, or carbon black, black iron oxide, etc., and functions to filter and shade light.
Note that the light absorbing material 1035 may be provided only in the vertical columnar microlens 1011, or may be provided only in the lateral columnar microlens 1021.
As shown in fig. 10c, the cylindrical microlens layer includes a cylindrical microlens layer i composed of a plurality of vertical cylindrical microlenses 1011 and a cylindrical microlens layer ii composed of a plurality of horizontal cylindrical microlenses 1021, and the diffusion particles 1034 and the light absorbing material 1035 are simultaneously disposed in the vertical cylindrical microlenses 1011 and the horizontal cylindrical microlenses 1021, so as to achieve the effects of light homogenizing, filtering and color mixing, and have a very good effect in display applications.
As a further supplementary note, diffusion particles 1034 and/or light-absorbing materials 1035 may also be added to the first substrate layer 102; diffusing particles 1034 and/or light absorbing materials 1035 may also be added to the reflective microstructure layer 103 to further enhance the light homogenizing and filtering toning effects.
As a further supplementary note, a reflective layer having a specular reflection function or a diffuse reflection function may be disposed on a side of the reflective micro-structure layer 103 away from the lenticular micro-lens layer 101, that is, the reflective layer may be a specular reflective layer or a diffuse reflective layer.
EXAMPLE III
The difference between the projection screen of the present embodiment and the first embodiment is: referring to the schematic structural diagram of the projection screen shown in fig. 11, a surface of one side of the lenticular microlens layer 101, which is far away from the first substrate layer 102, is a rough surface 1012, and the rough surface 1012 is formed by performing a roughening process on a cylindrical surface of a vertical lenticular microlens 1011 of the lenticular microlens layer 101. Here, the rough surface 1012 may be formed by transferring or spraying a glue having diffusion particles by using a glue after a sand blast process or a mold surface roughening process. The rough surface 1012 can further diffuse light, and functions in light evening, hardening protection and imaging.
Example four
The difference between the projection screen of the present embodiment and the third embodiment is that: referring to the schematic view of the projection screen structure shown in fig. 12, a surface of the first substrate layer 102 on a side close to the lenticular microlens layer 101 is a rough surface 1012, and a forming manner of the rough surface 1012 is described in detail in the third embodiment, and is not described again here. The rough surface is arranged on the surface of the first substrate layer 102, so that the light diffusion capability of the projection screen is further enhanced.
As a further supplementary description, the other side surface of the first substrate layer 102 may be a rough surface, that is, the other side surface of the first substrate layer 102 may be subjected to a roughening treatment, so as to further enhance the light-equalizing capability of the projection screen.
EXAMPLE five
Refer to fig. 13 for a schematic diagram of a projection screen structure. The projection screen 10 comprises a first substrate layer 102, a columnar microlens layer I, a filling resin material layer 105, a columnar microlens layer II and a reflection microstructure layer 103, wherein the first substrate layer 102, the columnar microlens layer I and the filling resin material layer 105 are sequentially arranged in the thickness direction of the projection screen, the columnar microlens layer II is composed of a plurality of transverse columnar microlenses 1021, and the reflection microstructure layer 103 is sequentially arranged in the thickness direction of the projection screen; the surface of one side of the first substrate layer 102, which is far away from the cylindrical microlens layer i and the cylindrical microlens layer ii, is a rough surface 1012, the forming mode of the rough surface 1012 is described in detail in the third embodiment, and details are not repeated here, and the rough surface 1012 can diffuse light, so as to play a role in dodging, hardening protection and imaging; the filling resin material layer 105 is used for filling a columnar microlens layer I consisting of a plurality of vertical columnar microlenses 1011 and a columnar microlens layer II consisting of a plurality of horizontal columnar microlenses 1021.
In this embodiment, the features of the first pillar microlens layer i, the second pillar microlens layer ii, the first substrate layer 102, and the reflective microstructure layer 103 are further described in the first embodiment. Note that the refractive index of the material of the cylindrical microlens layer I composed of a plurality of vertical cylindrical microlenses 1011 is n1The refractive index of the material of the cylindrical microlens layer II composed of a plurality of transverse cylindrical microlenses 1021 is n3The refractive index of the material of the filling resin material layer 105 is n2Then n is1≠n2，n3≠n2(ii) a That is, the refractive index of the material of the filling resin material layer 105 is different from the refractive indexes of the materials of the columnar microlens layer i and the columnar microlens layer ii as much as possible, and whether the refractive indexes of the materials of the columnar microlens layer i and the columnar microlens layer ii are the same or not is not limited. Through setting up the material of adjacent two-layer different refractive index for light takes place the refraction at the interface of two kinds of materials, and the refractive index difference of two kinds of materials is big more, and the cylindrical microlens layer that cylindrical microlens layer I and cylindrical microlens layer II constitute is diffusion ability stronger more, can be according to watching the visual angle, sets up the book of materialAnd the refractive index is used for adjusting the diffusion visual angle of the columnar microlens layer.
As a further supplementary note, the positions of the lenticular microlens layer i and the lenticular microlens layer ii are interchangeable, and the effect of the lenticular microlens layer formed after the exchange is not changed, so that the same effect can be obtained for the whole projection screen.
As a supplementary description, the features of the corresponding structures of the pillar microlens layer i, the pillar microlens layer ii, the first substrate layer 102, and the reflective microstructure layer 103 are similar, and the design of the pillar microlens layer i, the pillar microlens layer ii, the first substrate layer 102, and the reflective microstructure layer 103 can refer to the description of the first embodiment, and the details are not repeated here.
As a further supplementary explanation, diffusing particles and/or light absorbing materials may also be added to first substrate layer 102; diffusing particles and/or light absorbing materials may also be added to the reflective microstructure layer 103; diffusing particles and/or light absorbing materials may also be added to the filled resin material layer 105 to further enhance the light homogenizing and filtering toning effects.
EXAMPLE six
The difference between the projection screen of the present embodiment and the projection screen of the fifth embodiment is: referring to the schematic structural diagram of the projection screen shown in fig. 14, a surface of a side, away from the first substrate layer 102, of the lenticular microlens layer i formed by a plurality of vertical lenticular microlenses 1011 is a rough surface 1012. The rough surface 1012 is formed by roughening the cylindrical surface of the vertical columnar microlens 1011 of the columnar microlens layer i. Here, the rough surface 1012 may be formed by performing sand blasting or roughening of the mold surface, and then transferring or spraying a glue solution containing diffusion particles thereon. Rough surface 1012 may further diffuse light for light leveling, hardening protection, and imaging.
As a supplementary description, the surface of the lenticular microlens layer ii formed by the plurality of lateral lenticular microlenses 1021 on the side away from the first substrate layer 102 may be a rough surface, and the forming process and the function of the rough surface are the same as those described above and will not be repeated here.
EXAMPLE seven
The difference between the projection screen of the present embodiment and the projection screen of the fifth embodiment is: referring to the schematic view of the projection screen structure shown in fig. 15, the projection screen 10 further includes a second substrate layer 104, and the second substrate layer 104 is disposed between the leveling resin material layer 105 and the reflective microstructure layer 103.
As a further supplementary note, the second substrate layer 104 may be made of a material including, but not limited to, flexible plastic or rubber material such as polyethylene, polypropylene, polystyrene, polyvinyl chloride, casein phosphopeptide, biaxial polypropylene, polycarbonate, polyethylene terephthalate, polyamide, polyurethane, polymethyl methacrylate, polycarbonate, thermoplastic polyurethane elastomer, or a transparent substrate having a certain rigidity such as glass, acryl, ceramic, etc.
Further, the second substrate layer 104 can be colored by a gray dye/pigment, so that the transmittance of the second substrate layer 104 is properly reduced, the overall appearance color of the projection screen is adjusted, the absorption of ambient light is increased, and the contrast of the projection screen is improved.
As a further supplement, diffusing particles and/or light absorbing materials may also be added to second substrate layer 104 to further enhance the light homogenizing and filtering toning effects.
Example eight
The present embodiment differs from the projection screen of the seventh embodiment in that: referring to the schematic view of the projection screen structure shown in fig. 16, a surface of the second substrate layer 104 on a side away from the reflective microstructure layer 103 is a rough surface 1012. Here, the rough surface 1012 may be formed by transferring or spraying a glue having diffusion particles by using a glue after a sand blast process or a mold surface roughening process. The rough surface 1012 can further diffuse light, and functions in light evening, hardening protection and imaging.
As a further supplementary description, the other side surface of the second substrate layer 104 may be a rough surface, that is, the other side surface of the second substrate layer 104 may be subjected to a roughening treatment, so as to further enhance the light-uniformizing capability of the projection screen.
Example nine
The present embodiment differs from the projection screen of the seventh embodiment in that: referring to the schematic structural diagram of the projection screen shown in fig. 17, a reflective layer 106 is disposed on a side of the reflective microstructure layer 103 away from the lenticular microlens layer. The reflective layer 106 has a specular reflection function or a diffuse reflection function, i.e., the reflective layer 106 may be a specular reflective layer or a diffuse reflective layer. Both specular and diffuse reflective layers are capable of reflecting light, with the following differences: the surface of the mirror reflection layer is smooth like a mirror surface, and reflected light and incident light meet the optical reflection theorem, so that clear images can be formed, and the mirror reflection layer can be generally manufactured in an electroplating mode; the diffuse reflection layer has a rough surface, reflected light is transmitted to all directions without regularity, clear images cannot be formed, and the diffuse reflection layer is generally manufactured by printing and spraying.
As a supplementary further illustration, the reflective layer 106 may be configured to have a certain light transmittance, so that the ambient light entering the inside of the projection screen can pass through the reflective layer, so that the ambient light is not reflected to the viewing area, which is very effective in improving the contrast of the projection screen.
Furthermore, a pigment/dye capable of emitting red, green and blue light and absorbing/transmitting visible light of other colors can be added into the reflective layer 106 to absorb more ambient light and improve the contrast of the projection screen.
Example ten
The difference between the projection screen of this embodiment and the projection screen of the ninth embodiment is that: referring to the side view of the projection screen shown in fig. 18, the projection screen 10 further includes a black back plate 107 and a decorative frame 108, the black back plate 107 is disposed on a side of the reflective layer 106 away from the lenticular layer 101, and the decorative frame 108 wraps the projection screen along the thickness direction of the projection screen. The black back plate 107 can be closely attached to the reflective layer 106 through a double-sided adhesive tape or an EVA hot melt adhesive, and a black paint can be disposed on the surface of the black back plate 107 to absorb unnecessary light incident on the black back plate, so that the contrast of the projection screen can be properly improved. The decorative frame 108 is installed around the black back plate 107 and surrounds each layer structure of the projection screen in the thickness direction of the projection screen to fix and beautify the appearance of the projection screen and to form a projection viewing area by segmentation. The decorative outer frame 108 and the black back plate 107 can be fixed by double-sided adhesive tape or by screws/bolts.
EXAMPLE eleven
The projection screen of the present embodiment differs from that of the tenth embodiment in that: referring to the side view of the projection screen shown in fig. 19, the projection screen 10 further includes a hanging member 109 disposed on a side of the black back plate 107 away from the lenticular layer 101, and the hanging member 109 is fixed at a corresponding position of the black back plate 107 by double-sided adhesive or screw fixation, so as to facilitate subsequent mounting of the projection screen on a wall surface.
As a further supplementary description, the hanging member 109 may be replaced with a magnetic material so as to mount the projection screen on the wall surface by magnetic attraction, thereby ensuring the aesthetic property of the wall surface.
Example twelve
Referring to fig. 20, a schematic diagram of the optical path transmission of the projection system is shown. Projection system 20 includes projector Y and projection screen, and projection screen includes the first substrate layer 102 that sets gradually along projection screen thickness direction, the column microlens layer I of constituteing by a plurality of vertical column microlens 1011, fill and level up resin material layer 105, the column microlens layer II that comprises a plurality of horizontal column microlens 1021, fill and level up resin material layer 105 and reflection microstructure layer 103, and one side surface that first substrate layer 102 kept away from the column microlens layer is the rough surface. The features of the first substrate layer 102, the first lenticular layer i, the second lenticular layer ii, the filling resin material layer 105 and the reflective microstructure layer 103 in the projection screen have been described in detail in the foregoing embodiments and will not be repeated here.
Incident light G emitted by the projector Y passes through the first substrate layer 102, the columnar microlens layer i, the filling resin material layer 105, the columnar microlens layer ii, the filling resin material layer 105 and the reflective microstructure layer 103 in sequence, is finally reflected by the reflective microstructure layer 103, and then exits to the viewing range through the filling resin material layer 105, the columnar microlens layer ii, the filling resin material layer 105, the columnar microlens layer i and the first substrate layer 102 in sequence. The display brightness uniformity of the projector can be greatly improved by using the projection screen, and the whole projection system has extremely high brightness display uniformity.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (13)

1. A projection screen comprises a columnar micro-lens layer (101), a first substrate layer (102) and a reflection micro-structural layer (103), wherein the columnar micro-lens layer (101) is arranged along the thickness direction of the projection screen and is arranged on one side of the first substrate layer (102), and the projection screen is characterized in that:
the columnar microlens layer (101) comprises a columnar microlens layer I and a columnar microlens layer II;
the columnar microlens layer I comprises a plurality of vertical columnar microlenses (1011), the height-width ratio of the vertical columnar microlenses (1011) arranged along the transverse direction of the projection screen towards two ends is gradually reduced by taking a central axis as a reference, the central axis (Z) is a symmetric axis of the vertical columnar microlenses (1011) with the maximum height-width ratio in the columnar microlens layer I, and the height-width ratio of the vertical columnar microlenses is equal to the height of the vertical columnar microlenses/the width of the vertical columnar microlenses;
the cylindrical micro-lens layer II comprises a plurality of transverse cylindrical micro-lenses (1021), the aspect ratio of the transverse cylindrical micro-lenses (1021) is gradually reduced from one side to the other side along the vertical direction of the projection screen (10), and the aspect ratio of the transverse cylindrical micro-lenses is equal to the height of the transverse cylindrical micro-lenses/the width of the transverse cylindrical micro-lenses;
the reflecting microstructure layer (103) is provided with a plurality of microstructures (1031), and the extending direction or edge profile of each microstructure (1031) forms an arc shape, a parabola shape, an ellipse shape or a straight line shape.
2. A projection screen according to claim 1, characterized in that the cross-section of the vertical cylindrical microlenses (1011) in the transverse direction of the projection screen (10) is in the shape of at least three line segments connected end to end or in the shape of at least two curves connected end to end or in the shape of at least one line segment connected end to end with at least one curve; the cross section of the transverse columnar micro lens (1021) in the vertical direction of the projection screen (10) is in a shape formed by connecting at least three line segments end to end or a shape formed by connecting at least two curves end to end or a shape formed by connecting at least one line segment and at least one curve end to end.
3. A projection screen according to claim 1, characterized in that the microstructure (1031) has a cross-section in the vertical direction of the projection screen of at least three line segments connected end to end or of at least two curves connected end to end or of at least one line segment connected end to end with at least one curve.
4. A projection screen according to claim 1, wherein diffusing particles (1034) are disposed within both the vertical cylindrical microlenses (1011) and the lateral cylindrical microlenses (1021).
5. A projection screen according to claim 1, wherein both the vertical cylindrical microlenses (1011) and the lateral cylindrical microlenses (1021) have light absorbing material (1035) disposed therein.
6. A projection screen according to claim 1, wherein the reflective microstructure layer (103) is disposed on a side of the first substrate layer (102) remote from the lenticular layer (101), and a surface of the lenticular layer (101) remote from the first substrate layer (102) is roughened (1012).
7. A projection screen according to claim 1, wherein the surface of the first substrate layer (102) on the side away from the lenticular microlens layer (101) is rough (1012); one side, far away from the first base material layer (102), of the columnar microlens layer (101) is provided with a filling resin material layer (105) for filling the columnar microlens layer (101), and the reflection microstructure layer (103) is connected with the columnar microlens layer (101) through the filling resin material layer (105).
8. A projection screen according to claim 7 wherein the surface of the lenticular layer (101) on the side remote from the first substrate layer (102) is roughened (1012).
9. A projection screen according to claim 7, further comprising a second substrate layer (104), wherein the second substrate layer (104) is disposed on the side of the reflective micro-structured layer (103) adjacent to the lenticular micro-lens layer (101).
10. A projection screen according to claim 7, characterised in that the side of the reflective micro-structured layer (103) remote from the lenticular micro-lens layer (101) is provided with a reflective layer (106) having a specular or diffuse reflecting function.
11. A projection screen according to claim 10, further comprising a black back plate (107) and a decorative frame (108), wherein the black back plate (107) is disposed on a side of the reflective layer (106) away from the lenticular layer (101), and the decorative frame (108) wraps around the projection screen (10).
12. A projection screen according to claim 11, further comprising a magnetic material or suspension (109) and disposed on a side of the black back plate (107) remote from the lenticular layer (101).
13. A projection system comprising a projector and a projection screen according to any one of claims 1 to 12.
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