Projection screens and projection systems

Abstract

The present invention provides a projection screen and a projection system. The projection screen includes a base layer and a microstructure layer. The microstructure layer includes multiple groups of triangular pyramid periodic structures arranged on the base layer along a first direction. Each group of triangular pyramid periodic structures includes multiple triangular pyramid unit groups arranged along a second direction. Each triangular pyramid unit group includes a first triangular pyramid unit and a second triangular pyramid unit adjacent to each other. The top of the first triangular pyramid unit and the top of the second triangular pyramid unit face the same direction. Each first triangular pyramid unit includes a first transmissive bottom surface and a first reflective side surface connected to the first transmissive bottom surface. Each second triangular pyramid unit includes a second transmissive bottom surface and a second reflective side surface, a third reflective side surface, and a third connecting side surface connected to the second transmissive bottom surface. The first transmissive bottom surface and the second transmissive bottom surface are centrally symmetrically arranged on the base layer. The ridgeline between the first reflective side surface and the first transmissive bottom surface is parallel to the ridgeline between the third connecting side surface and the second transmissive bottom surface.

Description

Technical Field

[0001] The present invention relates to the field of optical technology, and in particular to a projection screen and a projection system. Background Art

[0002] With the rapid growth of the home and portable direct projection market, direct projection projectors are becoming increasingly popular. However, due to size and price constraints, direct projection projectors have low luminous flux, resulting in low brightness when projected directly onto the wall. However, adding a high-gain, ambient light-resistant screen significantly improves display brightness, while increasing costs minimally, far less than purchasing a projector with a higher luminous flux. Therefore, developing projection screens with high brightness and high brightness uniformity can greatly enhance the audience's projector experience. Furthermore, these screens are compatible with all brands of direct projection products and can be quickly applied to the vast existing and incremental direct projection markets.

[0003] The direct projection screens used by the mainstream direct projection projectors on the market currently adopt white plastic screens and glass bead screens that are not resistant to ambient light. Under ambient light conditions, the display effect tends to be whitish, the color saturation is low, and the screen brightness uniformity is poor. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a projection screen and a projection system to solve the above problems. The embodiments of the present invention achieve the above purpose through the following technical solutions.

[0005] In a first aspect, the present invention provides a projection screen, comprising a base layer and a microstructure layer, the microstructure layer comprising a plurality of groups of triangular pyramid periodic structures, the plurality of groups of triangular pyramid periodic structures being arranged on the base layer along a first direction, each group of triangular pyramid periodic structures comprising a plurality of triangular pyramid unit groups arranged along a second direction, the second direction being different from the first direction, each triangular pyramid unit group comprising a first triangular pyramid unit and a second triangular pyramid unit adjacent to each other, the top of the first triangular pyramid unit and the top of the second triangular pyramid unit facing the same direction, each first triangular pyramid unit comprising a first transmissive bottom surface and a first reflective side surface connected to the first transmissive bottom surface, a first connecting side surface, and a second connecting side surface, each second triangular pyramid unit comprising a second transmissive bottom surface and a second reflective side surface connected to the second transmissive bottom surface, a third reflective side surface, and a third connecting side surface, the first transmissive bottom surface and the second transmissive bottom surface being both arranged on the base layer, the first transmissive bottom surface and the second transmissive bottom surface being centrally symmetrically arranged, and an edge line between the first reflective side surface and the first transmissive bottom surface being parallel to an edge line between the third connecting side surface and the second transmissive bottom surface.

[0006] In one embodiment, the multiple groups of triangular pyramid periodic structures are staggered along the second direction, so that the first triangular pyramid units and the second triangular pyramid units of the multiple groups of triangular pyramid periodic structures are alternately arranged along the second direction.

[0007] In one embodiment, the plane angle of the first connecting side surface is equal to the plane angle of the second connecting side surface, and the plane angle of the first reflecting side surface is smaller than the plane angle of the first connecting side surface; the plane angle of the second reflecting side surface is equal to the plane angle of the third reflecting side surface, and the plane angle of the second reflecting side surface is smaller than the plane angle of the third connecting side surface.

[0008] In one embodiment, the plane angle of the first connecting side surface is equal to the plane angle of the third connecting side surface.

[0009] In one embodiment, the setting range of the plane angle of the first reflective side is 3-12°, the setting range of the plane angle of the first connecting side, the second connecting side and the third connecting side is 70-90°, and the setting range of the plane angle of the second reflective side and the third reflective side is 5-15°; or, the setting range of the plane angle of the first reflective side is 3-30°, the setting range of the plane angle of the first connecting side, the second connecting side and the third connecting side is 70-90°, and the setting range of the plane angle of the second reflective side and the third reflective side is 5-50°.

[0010] In one embodiment, the base layer includes a light incident surface and a backlight surface opposite to each other, the microstructure layer is convexly arranged on the light incident surface, and the first transmissive bottom surface and the second transmissive bottom surface are both arranged on the light incident surface; or, the microstructure layer is convexly arranged on the backlight surface, and the first transmissive bottom surface and the second transmissive bottom surface are both arranged on the backlight surface.

[0011] In one embodiment, the base layer includes a light incident surface and a backlight surface opposite to each other, the microstructure layer is arranged in the base layer, and the first transmissive bottom surface and the second transmissive bottom surface are both arranged on the light incident surface; or, the first transmissive bottom surface and the second transmissive bottom surface are both arranged on the backlight surface.

[0012] In one embodiment, the edge contour shapes of the first transmissive bottom surface and the second transmissive bottom surface are both isosceles triangles.

[0013] In one embodiment, the projection screen further includes a reflective layer, which is disposed on the first reflective side surface, the second reflective side surface, the third reflective side surface, the first connecting side surface, the second connecting side surface, and the third connecting side surface of the multiple groups of triangular pyramid periodic structures.

[0014] In one embodiment, the projection screen further includes a protective layer, which is disposed on a side of the reflective layer facing away from the microstructure layer.

[0015] In one embodiment, the projection screen further includes an anti-glare layer, which is disposed on a side of the base layer facing away from the microstructure layer, and faces the incident light.

[0016] In one embodiment, the base layer is a bulk diffusion layer, which includes a resin base material and diffusion particles doped therein.

[0017] In a second aspect, the present invention further provides a projection system, comprising a projection device and any one of the above-mentioned projection screens, wherein the projection screen is arranged on the light-emitting side of the projection device.

[0018] In one embodiment, there are multiple projection devices, and projection images of two adjacent projection devices on the projection screen at least partially overlap.

[0019] Compared with the prior art, the projection screen and projection system provided by the present invention include a base layer and a microstructure layer, the microstructure layer includes multiple groups of triangular pyramid periodic structures, the multiple groups of triangular pyramid periodic structures are arranged on the base layer along a first direction, each group of triangular pyramid periodic structures includes multiple triangular pyramid unit groups arranged along a second direction, the second direction is different from the first direction, because the triangular pyramid periodic structure is arranged for incident light with a specific projection ratio or a specific incident angle, the incident angle of most ambient light will not be reflected back to the audience's perspective by the triangular pyramid unit group, so that the projection screen can resist ambient light, each triangular pyramid unit group includes a first triangular pyramid unit and a The second triangular pyramid unit has a top portion of the first triangular pyramid unit and a top portion of the second triangular pyramid unit facing the same direction. Each first triangular pyramid unit includes a first transmissive bottom surface and a first reflective side surface connected to the first transmissive bottom surface, a first connecting side surface, and a second connecting side surface. Each second triangular pyramid unit includes a second transmissive bottom surface and a second reflective side surface connected to the second transmissive bottom surface, a third reflective side surface, and a third connecting side surface. The first transmissive bottom surface and the second transmissive bottom surface are both disposed on the base layer, the first transmissive bottom surface and the second transmissive bottom surface are centrally symmetrically arranged, and the ridgeline between the first reflective side surface and the first transmissive bottom surface is parallel to the ridgeline between the third connecting side surface and the second transmissive bottom surface. This arrangement improves the brightness uniformity of the projection screen, provides high gain, adapts to various projector positions, and enhances versatility.

[0020] These and other aspects of the present invention will become more readily apparent from the following description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a structural schematic diagram of the projection screen provided by the present invention.

[0023] Figure 2 yes Figure 1 Schematic diagram of part of the projection screen shown.

[0024] Figure 3 yes Figure 1 The schematic diagram of the structure of the triangular pyramid unit group of the projection screen is shown.

[0025] Figure 4 The light is incident on Figure 1 Schematic diagram of the structure when the projection screen is in the center.

[0026] Figure 5 yes Figure 1 The structure diagram of the projection screen shown is when the microstructure layer is protruding from the backlight surface.

[0027] Figure 6 yes Figure 5 The light path diagram of each triangular pyramid unit group of the projection screen reflecting the incident light.

[0028] Figure 7 yes Figure 1 The structure diagram of the projection screen shown is when the microstructure layer is protruding from the light incident surface.

[0029] Figure 8 yes Figure 7 The light path diagram of each triangular pyramid unit group of the projection screen reflecting the incident light.

[0030] Figure 9 yes Figure 1 The structure diagram of the projection screen shown is when the microstructure layer is recessed on the backlight surface.

[0031] Figure 10 yes Figure 9 The light path diagram of each triangular pyramid unit group of the projection screen reflecting the incident light.

[0032] Figure 11 yes Figure 1 The structure diagram of the projection screen shown is when the microstructure layer is recessed on the light incident surface.

[0033] Figure 12 yes Figure 11 The light path diagram of each triangular pyramid unit group of the projection screen reflecting the incident light.

[0034] Figure 13 The incident light from the projector is incident on Figure 1 The schematic diagram of the structure when the edge of one side of the projection screen is shown.

[0035] Figure 14 yes Figure 13 The light path diagram of the projection screen when the microstructure layer is protruding on the backlight surface is shown.

[0036] Figure 15 yes Figure 14The light path diagram of each triangular pyramid unit group of the projection screen reflecting the incident light.

[0037] Figure 16 yes Figure 13 The light path diagram of the projection screen when the microstructure layer is protruding from the light incident surface.

[0038] Figure 17 yes Figure 16 The light path diagram of each triangular pyramid unit group of the projection screen reflecting the incident light.

[0039] Figure 18 When the projector is projected sideways, the incident light is incident on Figure 1 The schematic diagram of the structure when the edge of one side of the projection screen is shown.

[0040] Figure 19 When the projector is projected sideways, the incident light is incident on Figure 1 Schematic diagram of the structure when the projection screen is in the middle.

[0041] Figure 20 yes Figure 1 The diagram shows a structure of a projection screen in which the longitudinal dimension of the triangular pyramid unit group is equal to the lateral dimension.

[0042] Figure 21 yes Figure 1 The diagram shows a structure in which the longitudinal dimension of the triangular pyramid unit group of the projection screen is larger than the lateral dimension.

[0043] Figure 22 yes Figure 1 The diagram shows a structure of a projection screen in which the longitudinal dimension of the triangular pyramid unit group is smaller than the transverse dimension.

[0044] Figure 23 It is a side view of another projection screen provided by the present invention.

[0045] Figure 24 It is a side view of another projection screen provided by the present invention.

[0046] Figure 25 It is a structural schematic diagram of the projection system provided by the present invention.

[0047] Figure 26 It is a structural schematic diagram of another projection system provided by the present invention. DETAILED DESCRIPTION

[0048] To facilitate understanding of the embodiments of the present invention, a more comprehensive description of the embodiments of the present invention will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0050] The inventors of this application discovered that the display chips and lenses of mainstream smart micro-projectors currently on the market all employ a design with a significant offset between them, positioning the projector horizontally below the center of the screen. Without an optical structure to adjust the angle of the outgoing light, the direction of the outgoing light would deviate from the viewer's field of view, affecting the screen's brightness and uniformity.

[0051] Since adding a high-gain, ambient light-resistant screen significantly increases display brightness, and the resulting cost is far less than purchasing a projector with a higher luminous flux, developing a projection screen with high brightness and high brightness uniformity can greatly enhance the audience's projector experience. Currently, the mainstream direct-projection projectors on the market use screens such as white plastic screens and glass bead screens.

[0052] The interior of existing white plastic screens is a "sandwich" structure made of plastic fibers woven together in warp and weft, then laminated together with two layers of PVC (Polyvinyl chloride) film, typically white on the front and black on the back. The screen uses diffuse reflection to reflect incoming projection light. The advantage of diffuse reflection is consistent brightness in all directions, resulting in a wide viewing angle. However, because the incident light energy is diffused over a wide angle, even with 100% diffuse reflection, the center gain is only 1.0. Furthermore, incoming ambient light is also diffusely reflected at wide angles, easily entering the viewer's field of view, resulting in virtually no protection against ambient light.

[0053] Existing metal screens also use a PVC base material, with a reflective coating applied to the PVC base. The reflective coating is a mixture of resin, metal particles, and additives to enhance adhesion and leveling. Metal screens can offer higher brightness gain, with products ranging from 1.0 to 3.0. This is because metal has a narrow diffusion angle and a reflectivity exceeding 80%, resulting in a more concentrated reflected light energy. However, considering the use case of smart micro-projectors, the projector is typically placed parallel to the center of the screen, projecting onto the screen from below. In this case, metal screens lack chief ray correction, meaning the direction of the reflected light's central intensity deviates from the viewer's direction and is primarily reflected toward the ceiling. This results in poor brightness uniformity perceived by the human eye. Regarding ambient light immunity, metal screens have a relatively narrow diffusion angle, typically only 40 to 60 degrees. Since most ambient light comes from ceiling lamps, a significant portion of this light is also reflected toward the bottom surface, preventing it from reaching the viewer's field of view. Therefore, metal screens offer a certain degree of ambient light immunity.

[0054] However, the brightness uniformity of the above screen is not good, and it cannot support both front and side projection of the projector.

[0055] To address at least some of the aforementioned issues, the applicant proposes a projection screen and projection system that are not only resistant to ambient light but also support both front and side projection. Furthermore, the projection screen exhibits excellent brightness uniformity and high gain, adapting to various projector positions and enhancing versatility. The projection screen and projection system provided by the present invention are described in detail below in conjunction with the specific embodiments and accompanying drawings.

[0056] See also Figures 1 to 4The present invention provides a projection screen 10, comprising a base layer 100 and a microstructure layer 200, wherein the microstructure layer 200 comprises a plurality of groups of triangular pyramid periodic structures 210, wherein the plurality of groups of triangular pyramid periodic structures 210 are arranged on the base layer 100 along a first direction D1, wherein each group of triangular pyramid periodic structures 210 comprises a plurality of triangular pyramid unit groups 211 arranged along a second direction D2, wherein the second direction D2 is different from the first direction D1, wherein each triangular pyramid unit group 211 comprises a first triangular pyramid unit 213 and a second triangular pyramid unit 215 adjacent to each other, wherein the top of the first triangular pyramid unit 213 and the top of the second triangular pyramid unit 215 face the same direction, and each first triangular pyramid unit 213 comprises a first transmissive bottom surface 2131 and a second transmissive bottom surface 2132. A first reflective side surface 2133, a first connecting side surface 2135, and a second connecting side surface 2137 are connected to the first transmissive bottom surface 2131. Each second triangular pyramid unit 215 includes a second transmissive bottom surface 2151 and a second reflective side surface 2155 connected to the second transmissive bottom surface 2151, a third reflective side surface 2157, and a third connecting side surface 2153. The first transmissive bottom surface 2131 and the second transmissive bottom surface 2151 are both disposed on the base layer 100. The first transmissive bottom surface 2131 and the second transmissive bottom surface 2151 are centrally symmetrically disposed. The ridgeline between the first reflective side surface 2133 and the first transmissive bottom surface 2131 is parallel to the ridgeline between the third connecting side surface 2153 and the second transmissive bottom surface 2151.

[0057] In this embodiment, the projection screen 10 is a substantially rectangular plate-shaped structure having a length direction and a width direction. For ease of description, the length direction of the projection screen 10 is defined as being consistent with the horizontal direction, the width direction of the projection screen 10 is defined as being consistent with the vertical direction, and the thickness direction of the projection screen 10 is defined as being consistent with the vertical direction.

[0058] The base layer 100 can be used to provide the microstructure layer 200. In the present embodiment, the base layer 100 can be directly prepared by laser direct writing or precision lathe processing. The base layer 100 can be made of a transparent organic material such as PC (Polycarbonate) or PMMA (poly methyl methacrylate). The base layer 100 can also be formed into an optical microstructure with uneven surfaces by surface diffusion, using processes such as sandblasting, acid etching, and full-surface exposure, thereby enhancing the light diffusion effect.

[0059] See also Figure 5 In one embodiment, the base layer 100 includes a light incident surface 110 and a backlight surface 130 that are opposite to each other, wherein the light incident surface 110 faces the incident light emitted by the projection device, and the backlight surface 130 faces away from the incident light.

[0060] In this embodiment, the microstructure layer 200 is convexly disposed on the base layer 100. For example, the microstructure layer 200 can be convexly disposed on the light incident surface 110 or the backlight surface 130. In one embodiment, the microstructure layer 200 can also be disposed within the base layer 100, with the bottom of the microstructure layer 200 facing the incident light, that is, the microstructure layer 200 is concavely disposed on the backlight surface 130; or the bottom of the microstructure layer 200 can be away from the incident light, that is, the microstructure layer 200 is concavely disposed on the light incident surface 110. Regardless of the different configurations of the microstructure layer 200, the light control principle remains the same.

[0061] Please continue reading Figures 1 to 3 The microstructure layer 200 includes multiple groups of triangular pyramid periodic structures 210. The multiple groups of triangular pyramid periodic structures 210 are arranged on the base layer 100 along a first direction D1. The multiple groups of triangular pyramid periodic structures 210 are arranged in multiple rows on the base layer 100, wherein each group of triangular pyramid periodic structures 210 constitutes a row. Each group of triangular pyramid periodic structures 210 includes multiple triangular pyramid unit groups 211 arranged along a second direction D2. The second direction D2 is different from the first direction D1, so that the multiple groups of triangular pyramid periodic structures 210 are periodically arranged on the base layer 100. In this embodiment, the first direction D1 and the second direction D2 are perpendicular to each other, wherein the first direction D1 is aligned with the length direction of the projection screen 10, and the second direction D2 is aligned with the width direction of the projection screen 10. In other embodiments, the first direction D1 and the second direction D2 may not be perpendicular to each other. For example, the angle between the first direction D1 and the second direction D2 may be 45°.

[0062] Each triangular pyramid unit group 211 includes a first triangular pyramid unit 213 and a second triangular pyramid unit 215 adjacent to each other. The top of the first triangular pyramid unit 213 and the top of the second triangular pyramid unit 215 face the same direction. For example, the microstructure layer 200 is convexly disposed on the incident surface, and the top of the first triangular pyramid unit 213 and the top of the second triangular pyramid unit 215 both face the incident light. For another example, the microstructure layer 200 is disposed in the base layer 100, and the top of the first triangular pyramid unit 213 and the top of the second triangular pyramid unit 215 both face away from the incident light. The multiple groups of triangular pyramid periodic structures 210 are staggered along the second direction D2, so that the first triangular pyramid units 213 and the second triangular pyramid units 215 of the multiple groups of triangular pyramid periodic structures 210 are alternately arranged along the second direction D2. For example, along the first direction D1, starting from the first row, there are the first triangular pyramid units of the first group of triangular pyramid periodic structures 210, the second triangular pyramid units of the second group of triangular pyramid periodic structures 210, the first triangular pyramid units of the third group of triangular pyramid periodic structures 210, the second triangular pyramid units of the fourth group of triangular pyramid periodic structures 210, and so on.

[0063] Each first triangular pyramid unit 213 includes a first transmissive bottom surface 2131 and a first reflective side surface 2133, a first connecting side surface 2135, and a second connecting side surface 2137 connected to the first transmissive bottom surface 2131. The first reflective side surfaces 2133, the first connecting side surfaces 2135, and the second connecting side surfaces 2137 are connected in pairs. The first transmissive bottom surface 2131 is configured to transmit incident light, and the first reflective side surfaces 2133 are configured to reflect the incident light. For example, when the top of the first triangular pyramid unit 213 faces away from the incident light, the incident light passes through the first transmissive bottom surface 2131 and is incident on the first reflective side surface 2133. After reflection from the first reflective side surface 2133, the exiting light forms an angle with the incident light. For another example, when the top of the first triangular pyramid unit 213 faces toward the incident light, the incident light is directly reflected by the first reflective side surface 2133, forming an exiting light at an angle with the incident light.

[0064] The first reflective side surface 2133 can be used to deflect the vertical angle component of the incident light, wherein the vertical angle component refers to the component of the reflected light along the vertical direction. The first connecting side surface 2135 and the second connecting side surface 2137 have a connecting function.

[0065] In one embodiment, the plane angle of the first connecting side surface 2135 is equal to the plane angle of the second connecting side surface 2137, and the plane angle of the first reflective side surface 2133 is smaller than the plane angle of the first connecting side surface 2135. The plane angles herein refer to the angles between the side surfaces of the first triangular pyramid unit 213 and the first transmissive bottom surface 2131. The plane angle of the first reflective side surface 2133 is defined as the first plane angle, the plane angle of the first connecting side surface 2135 is defined as the second plane angle, and the plane angle of the second connecting side surface 2137 is defined as the third plane angle. For ease of manufacturing, the plane angles of the side surfaces can be constant. However, for projection systems with different throw ratios, the setting ranges of the plane angles of the side surfaces of the first triangular pyramid unit 213 in the projection screen 10 may vary. The relationship between the plane angles of the side surfaces of the first triangular pyramid unit 213 and the throw ratio is shown in Table 1.

[0066] Table 1

[0067] Throw ratio First plane angle Second plane angle Third plane angle Fourth plane angle Fifth plane angle Sixth plane angle 1.2 3~12 degrees 70~90 degrees 70~90 degrees 70~90 degrees 5~15 degrees 5~15 degrees 1.2 3~12 degrees 70~90 degrees 70~90 degrees 70~90 degrees 5~15 degrees 5~15 degrees 0.2 3~30 degrees 70~90 degrees 70~90 degrees 70~90 degrees 5~50 degrees 5~50 degrees 0.2 3~30 degrees 70~90 degrees 70~90 degrees 70~90 degrees 5~50 degrees 5~50 degrees

[0068] As shown in Table 1, for a projection system with a throw ratio of 1.2, the setting range of the first plane angle can be 3-12°, the setting range of the second plane angle can be 70-90°, and the setting range of the third plane angle can be 70-90°. For a projection system with a throw ratio of 0.2, the setting range of the first plane angle can be 3-30°, the setting range of the second plane angle can be 70-90°, and the setting range of the third plane angle can be 70-90°.

[0069] In one embodiment, the projection of the ridge between the first connecting side 2135 and the second connecting side 2137 on the base layer 100 is parallel to the first direction D1, so that the light reflected by the first connecting side 2135 and the light reflected by the second connecting side 2137 can be symmetrical about the central symmetry plane of the projection screen 10, wherein the central symmetry plane of the projection screen 10 refers to a vertical plane perpendicular to the plane where the base layer 100 is located, so that the number and intensity of light reflected to the central symmetry plane of the projection screen 10 are roughly equal, so the picture will not turn blue or yellow due to uneven diffuse reflection, thereby improving the uniformity of the projection screen 10.

[0070] Each second triangular pyramid unit 215 includes a second transmissive bottom surface 2151 and a third connecting side surface 2153 connected to the second transmissive bottom surface 2151, a second reflective side surface 2155 and a third reflective side surface 2157. The third connecting side surface 2153, the second reflective side surface 2155 and the third reflective side surface 2157 are connected in pairs, wherein the third connecting side surface 2153 has a connecting function, and the second reflective side surface 2155 and the third reflective side surface 2157 have the ability to deflect the vertical and horizontal angular components of the incident light, wherein the horizontal angular component refers to the component of the reflected light along the horizontal direction. The first triangular pyramid unit 213 can deflect the vertical angle component of the incident light through the first reflective side 2133, and the second triangular pyramid unit 215 can deflect the vertical and horizontal angle components of the incident light through the second reflective side 2155 and the third reflective side 2157, so that the triangular pyramid unit group 211 can enhance the control of the projection screen 10 over the angle of the reflected light, thereby improving the brightness uniformity of the projection screen 10. At the same time, since the second triangular pyramid units 215 have the ability to deflect horizontal angles, the projection screen 10 can be used for side projection of the projection device.

[0071] In one embodiment, the plane angle of the second reflective side surface 2155 is equal to the plane angle of the third reflective side surface 2157, and the plane angle of the second reflective side surface 2155 is smaller than the plane angle of the third connecting side surface 2153, wherein the plane angle here refers to the angle between each side surface of the second triangular pyramid unit 215 and the second transmissive bottom surface 2151.

[0072] In one embodiment, the plane angle of the third connecting side surface 2153 is equal to the plane angle of the first connecting side surface 2135. The plane angle of the third connecting side surface 2153 is defined as the fourth plane angle, the plane angle of the second reflective side surface 2155 is defined as the fifth plane angle, and the plane angle of the third reflective side surface 2157 is defined as the sixth plane angle. For ease of processing, the plane angles of each side surface can be constant. However, for projection systems with different throw ratios, the setting range of the plane angles of each side surface of the second triangular pyramid unit 215 in the projection screen 10 may vary. The relationship between the plane angles of each side surface of the second triangular pyramid unit 215 and the throw ratio is shown in Table 1.

[0073] As shown in Table 1, for a projection system with a throw ratio of 1.2, the fourth plane angle can be set within a range of 70 to 90 degrees, the fifth plane angle can be set within a range of 5 to 15 degrees, and the sixth plane angle can be set within a range of 5 to 15 degrees. For a projection system with a throw ratio of 0.2, the fourth plane angle can be set within a range of 70 to 90 degrees, the fifth plane angle can be set within a range of 5 to 50 degrees, and the sixth plane angle can be set within a range of 5 to 50 degrees.

[0074] In one embodiment, the projection of the ridge between the second reflective side 2155 and the third reflective side 2157 on the base layer 100 is parallel to the first direction D1, so that the light reflected by the second reflective side 2155 and the light reflected by the third reflective side 2157 can be symmetrical about the central symmetry plane of the projection screen 10, so that the number and intensity of the light reflected to the central symmetry plane of the projection screen 10 are roughly equal, thereby improving the uniformity of the projection screen 10.

[0075] The first transmissive bottom surface 2131 and the second transmissive bottom surface 2151 are both arranged on the base layer 100. The first transmissive bottom surface 2131 and the second transmissive bottom surface 2151 are arranged in a centrally symmetrical manner. That is, the first transmissive bottom surface 2131 can be rotated 180° along the center point on the base layer 100 to coincide with the second transmissive bottom surface 2151, so that the first transmissive bottom surface 2131 and the second transmissive bottom surface 2151 have the same shape and face opposite directions.

[0076] When the microstructure layer 200 is disposed protrudingly on the light incident surface, the first transmissive bottom surface 2131 and the second transmissive bottom surface 2151 are both disposed on the light incident surface 110. When the microstructure layer 200 is disposed protrudingly on the backlight surface 130, the first transmissive bottom surface 2131 and the second transmissive bottom surface 2151 are both disposed on the backlight surface 130. When the microstructure layer 200 is disposed within the base layer 100, the first transmissive bottom surface 2131 and the second transmissive bottom surface 2151 are both disposed on the light incident surface 110. Alternatively, the first transmissive bottom surface 2131 and the second transmissive bottom surface 2151 are both disposed on the backlight surface 130.

[0077] In one embodiment, the edge contour shapes of the first transmissive bottom surface 2131 and the second transmissive bottom surface 2151 are both isosceles triangles.

[0078] The principle of the projection screen 10 provided by the present invention is described below:

[0079] See also Figure 4 、 Figure 5 and Figure 6When the projection device is located at the bottom of the central axis of the projection screen 10 and light is incident on the center of the projection screen 10, the projection device uses a front projection mode. For ease of description, the incident light incident on the first reflective side surface 2133, the second reflective side surface 2155, and the third reflective side surface 2157 are defined as the first incident light ray I1, the second incident light ray I2, and the third incident light ray I3, respectively. The light reflected by the first reflective side surface 2133, the second reflective side surface 2155, and the third reflective side surface 2157 are defined as the first reflected light ray R1, the second reflected light ray R2, and the third reflected light ray R3, respectively.

[0080] See also Figure 5 and Figure 6 When the microstructure layer 200 is protruded from the backlight surface 130 , the incident light emitted by the projection device passes through the base layer 100 and is reflected by the microstructure layer 200 .

[0081] For the first triangular pyramid unit 213, the first reflective side surface 2133 of the first triangular pyramid unit 213 mainly deflects the vertical component of the first incident light I1, and the first reflected light R1 is still located in the central symmetry plane of the projection screen 10, mainly increasing the vertical direction component of the reflected light toward the audience and reflecting it in the direction of the audience. In this embodiment, the direction of the audience refers to the normal direction of the projection display surface of the projection screen 10 facing the audience.

[0082] Regarding the second triangular pyramid unit 215, the second reflective side surface 2155 and the third reflective side surface 2157 of the second triangular pyramid unit 215 change the vertical component of the second incident light I2 and the third incident light I3, reducing the vertical component of the second reflected light R2 and the third reflected light R3, and directing them toward the viewer. Simultaneously, the second reflected light R2 and the third reflected light R3 intersect and deviate from the central symmetry plane of the projection screen 10, forming an angle with each other. This increases the field of view of the projection screen 10, allowing viewers at the edges of the screen to enjoy a clear image. The first reflected light R1, the second reflected light R2, and the third reflected light R3 cooperate to reflect light within and on both sides of the central symmetry plane of the projection screen 10 toward the viewer. Viewers at the bottom and center of the projection screen 10 (whether in the middle or on either side) can enjoy a clear image. In short, viewers can enjoy a clear image regardless of their position on the projection screen 10, improving their viewing experience.

[0083] See also Figure 7 and Figure 8 When the microstructure layer 200 is protruded from the light incident surface 110 , the incident light emitted by the projection device is directly reflected by the microstructure layer 200 .

[0084] For the first triangular pyramid unit 213, the first reflective side surface 2133 of the first triangular pyramid unit 213 mainly deflects the vertical component of the first incident light I1, and the first reflected light R1 is still located in the central symmetry plane of the projection screen 10, increasing the vertical component of the reflected light toward the audience and reflecting it in the direction of the audience.

[0085] For the second triangular pyramid unit 215, the second reflective side surface 2155 and the third reflective side surface 2157 of the second triangular pyramid unit 215 change the vertical components of the second incident light I2 and the third incident light I3, so that the vertical components of the second reflected light R2 and the third reflected light R3 are reduced and directed toward the audience. At the same time, the second reflected light R2 and the third reflected light R3 do not intersect and deviate from the central symmetry plane of the projection screen 10, and form an angle with each other, which increases the horizontal angle distribution, thereby increasing the field of view angle of the projection screen 10, so that the audience at the edge of the screen can also enjoy a clear picture.

[0086] See also Figure 9 and Figure 10 When the microstructure layer 200 is further disposed in the base layer 100 and the bottom of the microstructure layer 200 faces away from the incident light, the incident light emitted by the projection device passes through the base layer 100 and is reflected by the microstructure layer 200 .

[0087] For the first triangular pyramid unit 213, the first reflective side surface 2133 of the first triangular pyramid unit 213 mainly deflects the vertical component of the first incident light I1, and the first reflected light R1 is still located in the central symmetry plane of the projection screen 10, mainly increasing the vertical component of the reflected light toward the audience and reflecting it in the direction of the audience.

[0088] For the second triangular pyramid unit 215, the second reflective side surface 2155 and the third reflective side surface 2157 of the second triangular pyramid unit 215 change the vertical components of the second incident light I2 and the third incident light I3, so that the vertical components of the second reflected light R2 and the third reflected light R3 are reduced and directed toward the audience. At the same time, the second reflected light R2 and the third reflected light R3 do not intersect and deviate from the central symmetry plane of the projection screen 10, and form an angle with each other, which increases the horizontal angle distribution, thereby increasing the field of view angle of the projection screen 10, so that the audience at the edge of the screen can also enjoy a clear picture.

[0089] See also Figure 11 and Figure 12 When the microstructure layer 200 is further disposed in the base layer 100 and the bottom of the microstructure layer 200 faces the incident light, the incident light emitted by the projection device is directly reflected by the microstructure layer 200 .

[0090] For the first triangular pyramid unit 213, the first reflective side surface 2133 of the first triangular pyramid unit 213 mainly deflects the vertical component of the first incident light I1, and the first reflected light R1 is still located in the central symmetric plane of the projection screen 10 and is reflected toward the audience.

[0091] For the second triangular pyramid unit 215, the second reflective side surface 2155 and the third reflective side surface 2157 of the second triangular pyramid unit 215 change the vertical components of the second incident light I2 and the third incident light I3, so that the vertical components of the second reflected light R2 and the third reflected light R3 are reduced and directed toward the audience. At the same time, the second reflected light R2 and the third reflected light R3 intersect and deviate from the central symmetry plane of the projection screen 10, and form an angle with each other, thereby increasing the field of view angle of the projection screen 10.

[0092] See also Figure 13 、 Figure 14 and Figure 15 When the projection device projects light from the device forward and it is incident on one edge of the projection screen 10, if the microstructure layer 200 is protruding from the backlight surface 130, the incident light from the projection device passes through the base layer 100 and is reflected by the microstructure layer 200. The first incident light ray I1 is reflected by the first reflective side surface 2133 of the first triangular pyramid element 213 onto a plane of symmetry offset from the center of the projection screen 10. The second incident light ray I2 is reflected by the second reflective side surface 2155 of the second triangular pyramid element 215 onto a plane of symmetry offset from the center of the projection screen 10. The third incident light ray I3 is reflected by the third reflective side surface 2157 of the second triangular pyramid element 215 onto a plane of symmetry closer to the center of the projection screen 10. The second reflected light ray R2 and the third reflected light ray R3 intersect. Compared to a projection screen 10 without the microstructure layer 200, the third reflective side surface 2157 increases the amount of reflected light near the center of the projection screen 10. Therefore, the projection screen 10 of the present application has higher brightness uniformity.

[0093] See also Figure 16 and Figure 17If the microstructure layer 200 is protruding from the light incident surface 110 and the projection device is a side projection device, the incident light emitted by the projection device is directly reflected by the microstructure layer 200. The first incident light ray I1 is reflected by the first reflective side surface 2133 of the first triangular pyramid element 213 toward the center of the screen; the second incident light ray I2 is reflected by the second reflective side surface 2155 of the second triangular pyramid element 215 toward a plane of symmetry offset from the center of the projection screen 10; and the third incident light ray I3 is reflected by the third reflective side surface 2157 of the second triangular pyramid element 215 toward a plane of symmetry offset from the center of the projection screen 10. The second reflected light ray R2 and the third reflected light ray R3 do not intersect. Compared to a projection screen 10 without the microstructure layer 200, the second reflective side surface 2155 and the third reflective side surface 2157 increase the amount of reflected light near the center of the projection screen 10. Therefore, the projection screen 10 of the present application has higher brightness uniformity.

[0094] See also Figure 18 and Figure 19 When the projection device is projecting sideways, the situation is similar to when the projection device is projecting frontally. Because the multiple groups of triangular pyramid periodic structures 210 are periodically arranged on the base layer 100 and do not have a fixed center of symmetry, the three incident light beams incident on the projection screen 10 are split into three reflected light beams by the first reflective side surface 2133 of each first triangular pyramid unit 213 and the second reflective side surface 2155 and the third reflective side surface 2157 of the second triangular pyramid unit 215. At least one reflected light beam will be close to the audience's field of view. Therefore, this method can improve the brightness uniformity of the projection screen 10.

[0095] See also Figures 20 to 22 In one embodiment, the aspect ratio of the microstructure layer 200 can be adjusted to meet the requirements of specific application scenarios to create a suitable reflected light field distribution. The aspect ratio refers to the ratio of the midline to the bottom edge of the first transmissive bottom surface 2131 (second transmissive bottom surface 2151). Specifically, a larger aspect ratio indicates a narrower first transmissive bottom surface 2131 (second transmissive bottom surface 2151), while a smaller aspect ratio indicates a wider first transmissive bottom surface 2131 (second transmissive bottom surface 2151). Changing the aspect ratio of the microstructure layer 200 does not affect the processability of the microstructure layer 200. If the angles from the first to sixth plane angles remain unchanged, the light refraction power of the first reflective side surface 2133 remains unchanged, and the angle of reflected light remains unchanged. However, the horizontal angle deflection power of the second and third reflective side surfaces 2155 and 2157 increases with increasing aspect ratio, while the vertical angle deflection power decreases with increasing aspect ratio.

[0096] In one embodiment, the microstructure layer 200 may be combined with other functional layers to better enhance the viewing effect of the projection screen 10 .

[0097] See also Figure 23 In one embodiment, the microstructure layer 200 is disposed on the light incident surface 110. The projection screen 10 further includes a reflective layer 300, which is disposed on the first reflective side surface 2133, the second reflective side surface 2155, the third reflective side surface 2157, the first connecting side surface 2135, the second connecting side surface 2137, and the third connecting side surface 2153 of the multiple sets of triangular pyramid periodic structures 210. The reflective layer 300 can be applied by spraying or roller coating a coating containing a mixture of aluminum silver powder, resin, color paste, and other raw materials onto the first reflective side surface 2133, the second reflective side surface 2155, the third reflective side surface 2157, the first connecting side surface 2135, the second connecting side surface 2137, and the third connecting side surface 2153 of the multiple sets of triangular pyramid periodic structures 210.

[0098] See also Figure 24 In one embodiment, the projection screen 10 further includes a protective layer (not shown). The protective layer is disposed on the side of the reflective layer 300 facing away from the microstructure layer 200 to protect the reflective layer 300 from scratches during transportation or use. The protective layer can be formed by attaching a protective film material with double-sided tape, or by UV (Ultraviolet) printing or spraying a protective coating on the side of the reflective layer 300 facing away from the microstructure layer 200.

[0099] In one embodiment, the microstructure layer 200 is disposed on the backlight surface 130. The projection screen 10 further includes an anti-glare layer 500. The anti-glare layer 500 is disposed on the side of the base layer 100 facing away from the microstructure layer 200, with the anti-glare layer 500 facing the incident light. The anti-glare layer 500 can be made of silica. Sandblasting, acid etching, and full-surface exposure processes are used to form an undulating optical microstructure on the surface, thereby enhancing light diffusion. The anti-glare layer 500 utilizes silica to interfere with the refraction and diffuse reflection of the incident light, providing an anti-glare effect and preventing dizziness in the user's eyes from prolonged viewing.

[0100] In this embodiment, the base layer 100 may be a bulk diffusion layer, specifically comprising a resin base material and diffusion particles doped therein, such as aluminum powder or PMM particles, etc. In other embodiments, the base layer 100 may also be a transparent resin layer or other transparent material layer.

[0101] In summary, the projection screen 10 provided by the present invention includes a base layer 100 and a microstructure layer 200, the microstructure layer 200 includes a plurality of groups of triangular pyramid periodic structures 210, the plurality of groups of triangular pyramid periodic structures 210 are arranged on the base layer 100 along a first direction D1, each group of triangular pyramid periodic structures 210 includes a plurality of triangular pyramid unit groups 211 arranged along a second direction D2, the second direction D2 is different from the first direction D1, because the triangular pyramid periodic structures 210 are arranged for incident light with a specific projection ratio or a specific incident angle, the incident angle of most ambient light will not be reflected back to the audience's perspective by the triangular pyramid unit group 211, so that the projection screen 10 can resist ambient light, each triangular pyramid unit group 211 includes a first triangular pyramid unit 213 and a second triangular pyramid unit 215 adjacent to each other, the top of the first triangular pyramid unit 213 and the second triangular pyramid unit 215 are adjacent to each other, and the top of the first triangular pyramid unit 213 and the second triangular pyramid unit 215 are adjacent to each other. The tops of the pyramidal units 215 face the same direction. Each first triangular pyramidal unit 213 includes a first transmissive bottom surface 2131, a first reflective side surface 2133 connected to the first transmissive bottom surface 2131, a first connecting side surface 2135, and a second connecting side surface 2137. Each second triangular pyramidal unit 215 includes a second transmissive bottom surface 2151, a second reflective side surface 2155 connected to the second transmissive bottom surface 2151, a third reflective side surface 2157, and a third connecting side surface 2153. The first and second transmissive bottom surfaces 2131 and 2151 are both disposed on the base layer 100 and are centrally symmetrically arranged. The ridgeline between the first reflective side surface 2133 and the first transmissive bottom surface 2131 is parallel to the ridgeline between the third connecting side surface 2153 and the second transmissive bottom surface 2151. This arrangement improves the brightness uniformity of the projection screen 10, provides high gain, and adapts to various projector positions, enhancing versatility.

[0102] The parallelism mentioned in this application can be interpreted as being approximately parallel in a certain plane, and the central symmetry mentioned can be interpreted as being approximately centrally symmetric along a certain point in a certain plane.

[0103] See also Figure 25 The present invention further provides a projection system 1 , comprising a projection device 60 and a projection screen 10 , wherein the projection screen 10 is disposed on a light-emitting side of the projection device 60 .

[0104] See also Figure 26 In one embodiment, there are multiple projection devices 60 , and the projection images of two adjacent projection devices 60 on the projection screen 10 at least partially overlap, so as to improve the overall brightness of the projection screen 10 .

[0105] Since multiple groups of triangular pyramid periodic structures 210 are periodically arranged on the base layer 100 without a fixed center of symmetry, and the microstructure layer 200 supports the side projection of the projection device 60, multiple projection devices 60 can be combined and superimposed to improve the overall brightness of the projection screen 10.

[0106] In summary, the projection system 1 provided by the present invention includes a projection device 60 and a projection screen 10. The projection screen 10 is arranged on the light-emitting side of the projection device 60. The projection system 1 has good brightness uniformity, supports front projection and side projection, and has high gain characteristics. It can resist ambient light, adapt to a variety of projector positions, and improve versatility.

[0107] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A projection screen, characterized in that: include: basal layer; as well as A microstructure layer, wherein the microstructure layer includes multiple groups of triangular pyramid periodic structures, and the multiple groups of triangular pyramid periodic structures are arranged on the base layer along a first direction, each group of triangular pyramid periodic structures includes multiple triangular pyramid unit groups arranged along a second direction, the second direction is different from the first direction, each triangular pyramid unit group includes a first triangular pyramid unit and a second triangular pyramid unit adjacent to each other, the top of the first triangular pyramid unit and the top of the second triangular pyramid unit are oriented in the same direction, each first triangular pyramid unit includes a first bottom surface and a first reflective side surface connected to the first bottom surface, a first connecting side surface, and a second connecting side surface, each second triangular pyramid unit includes a second bottom surface and a second reflective side surface connected to the second bottom surface, a third reflective side surface, and a third connecting side surface, the first bottom surface and the second bottom surface are both arranged on the base layer, the first bottom surface and the second bottom surface are centrally symmetrically arranged, and the ridge line between the first reflective side surface and the first bottom surface is parallel to the ridge line between the third connecting side surface and the second bottom surface.

2. The projection screen according to claim 1, wherein The multiple groups of triangular pyramid periodic structures are staggered along the second direction, so that the first triangular pyramid units and the second triangular pyramid units of the multiple groups of triangular pyramid periodic structures are alternately arranged along the second direction.

3. The projection screen according to claim 1, wherein: The plane angle of the first connecting side surface is equal to the plane angle of the second connecting side surface, and the plane angle of the first reflecting side surface is smaller than the plane angle of the first connecting side surface; the plane angle of the second reflecting side surface is equal to the plane angle of the third reflecting side surface, and the plane angle of the second reflecting side surface is smaller than the plane angle of the third connecting side surface.

4. The projection screen according to claim 3, wherein: A plane angle of the first connecting side surface is equal to a plane angle of the third connecting side surface.

5. The projection screen according to claim 4, characterized in that The setting range of the plane angle of the first reflecting side is 3-12°, the setting range of the plane angle of the first connecting side, the second connecting side and the third connecting side is 70-90°, and the setting range of the plane angle of the second reflecting side and the third reflecting side is 5-15°; or, the setting range of the plane angle of the first reflecting side is 3-30°, the setting range of the plane angle of the first connecting side, the second connecting side and the third connecting side is 70-90°, and the setting range of the plane angle of the second reflecting side and the third reflecting side is 5-50°.

6. The projection screen according to claim 1, wherein: The base layer includes a light incident surface and a backlight surface opposite to each other, the microstructure layer is convexly arranged on the light incident surface, and the first bottom surface and the second bottom surface are both arranged on the light incident surface; or, the microstructure layer is convexly arranged on the backlight surface, and the first bottom surface and the second bottom surface are both arranged on the backlight surface.

7. The projection screen according to claim 1, wherein: The base layer includes a light incident surface and a backlight surface opposite to each other, the microstructure layer is arranged in the base layer, and the first bottom surface and the second bottom surface are both arranged on the light incident surface; or, the first bottom surface and the second bottom surface are both arranged on the backlight surface.

8. The projection screen according to claim 1, wherein The edge contour shapes of the first bottom surface and the second bottom surface are both isosceles triangles.

9. The projection screen according to claim 1, wherein: The projection screen further includes a reflective layer, which is arranged on the first reflective side surface, the second reflective side surface, the third reflective side surface, the first connecting side surface, the second connecting side surface, and the third connecting side surface of multiple groups of the triangular pyramid periodic structures.

10. The projection screen according to claim 9, characterized in that The projection screen further includes a protective layer, which is arranged on a side of the reflective layer away from the microstructure layer.

11. The projection screen according to claim 1, wherein The projection screen further comprises an anti-glare layer, which is arranged on a side of the base layer away from the microstructure layer and faces the incident light.

12. The projection screen according to claim 1, wherein The base layer is a bulk diffusion layer, and the bulk diffusion layer includes a resin base material and diffusion particles doped therein.

13. A projection system, characterized in that: The invention comprises a projection device and a projection screen as claimed in any one of claims 1 to 12, wherein the projection screen is arranged on the light-emitting side of the projection device.

14. The projection system according to claim 13, wherein: There are multiple projection devices, and the projection images of two adjacent projection devices on the projection screen at least partially overlap.

Images