Bidirectional projection screen and projection system

Abstract

The utility model discloses a projection screen and a projection system. The projection screen comprises a first base material, an optical microstructure, a reflecting layer and a second base material. Wherein the optical microstructure comprises a plurality of lens units, each lens unit comprises a first surface, a second surface and a third surface, the first surface of each lens unit is parallel to the plane of the first base material, the second surface is inclined by a set angle relative to the first surface, and the third surface is connected with the first surface and the second surface; the reflecting layer is at least located on the second surface of each lens unit. The first projection light beam enters the projection screen through one side of the first base material, is reflected by the reflecting layer on the optical microstructure, and is emitted from one side of the first base material of the projection screen; and the second projection light beam enters the projection screen through one side of the second base material, is reflected by the reflecting layer, and is emitted from one side of the second base material of the projection screen. Therefore, bidirectional projection of the projection screen is realized.

Description

Technical Field

[0001] The present application relates to the field of projection technology, and in particular to a two-way projection screen and a projection system. Background Art

[0002] With the continuous development of projection technology, laser is leading a new visual revolution due to its unique advantages, such as high brightness, wide color gamut, and excellent color reproduction. As laser projection technology is favored by more and more consumers, products such as laser cinemas, laser TVs, and projection screens have a huge market potential.

[0003] Traditional projection screens, such as white plastic, gray plastic, fiberglass, and soft white screens, are unidirectional, allowing projection effects to be displayed on only one side. However, when bidirectional projection is required in specialized applications like shopping malls and outdoor spaces, there are no bidirectional projection screens that can achieve this. Utility Model Content

[0004] According to a first aspect of an embodiment of the present application, a two-way projection screen is provided, comprising:

[0005] a first substrate, configured to transmit the first projection light beam;

[0006] an optical microstructure, located on one side surface of the first substrate;

[0007] a reflective layer, located on a surface of the optical microstructure away from the first substrate;

[0008] a second substrate, located on a side of the reflective layer away from the optical microstructures, and configured to transmit a second projection light beam to the reflective layer;

[0009] The optical microstructure includes a plurality of lens units, each lens unit including a first surface, a second surface, and a third surface. The first surface of each lens unit is parallel to the plane of the first substrate, the second surface is inclined at a set angle relative to the first surface, and the third surface connects the first surface and the second surface. The reflective layer is located at least on the second surface of each lens unit.

[0010] When the first projection beam is incident on the projection screen along a first angle range, the first projection beam is incident on the projection screen through a side of the first substrate, is reflected by the reflective layer on the optical microstructure, and is emitted from the side of the first substrate of the projection screen; when the second projection beam is incident on the projection screen along a second angle, the second projection beam is incident on the projection screen through a side of the second substrate, is reflected by the reflective layer, and is emitted from the side of the second substrate of the projection screen.

[0011] Compared with the prior art, the present application sets the angle of the second surface relative to the first surface in each lens unit of the optical microstructure so that after the first substrate transmits the first projection beam, the reflective layer on the optical microstructure reflects the first projection beam, and after the second substrate transmits the second projection beam, the reflective layer on the optical microstructure reflects the first projection beam, thereby achieving two-way projection of the projection screen.

[0012] In some embodiments of the present application, the second surface of each lens unit is tilted relative to the first surface at a setting angle α that conforms to the following formula:

[0013] -7×10 -9 ×x 2 +0.0007x-3.0341≤α≤-7×10 -9 ×x 2 +0.0007x+2.9659;

[0014] Here, x represents the vertical distance between the vertex of the first surface of each lens unit and the bottom edge of the projection screen in a vertical cross section from bottom to top of the projection screen.

[0015] The present application sets the size of the tilt angle α of the second surface of each lens unit relative to the first surface, so that when the first projection beam or the second projection beam is irradiated onto the reflective layer on the second surface of each lens unit, the reflective layer can accurately reflect the first projection beam or the second projection beam to the position where the audience is watching.

[0016] In some embodiments of the present application, the second surface of each lens unit is tilted at a setting angle α relative to the first surface within the range of (0°, 20°).

[0017] The present application sets the size of the tilt angle α of the second surface of each lens unit relative to the first surface, so that when the first projection beam or the second projection beam is irradiated onto the reflective layer on the second surface of each lens unit, the reflective layer can accurately reflect the first projection beam or the second projection beam to the position where the audience is watching.

[0018] In some embodiments of the present application, from bottom to top of the projection screen, the second surface of each lens unit is inclined at a setting angle α that gradually increases relative to the first surface.

[0019] The present application sets a change process of tilting the second surface of each lens unit relative to the first surface at a set angle α, so that when the first projection beam or the second projection beam is irradiated onto the reflective layer on the second surface of each lens unit, the reflective layer can accurately reflect the first projection beam or the second projection beam to the position where the audience is watching.

[0020] In some embodiments of the present application, each lens unit of the optical microstructure extends along the horizontal direction of the projection screen and is arranged in sequence along the vertical direction of the projection screen, and the horizontal direction and the vertical direction are perpendicular to each other.

[0021] The present application sets the positional relationship of each lens unit of the optical microstructure so that the first projection light beam or the second projection light beam of the projection screen can be reflected to the optimal viewing area for the audience.

[0022] In some embodiments of the present application, the projection screen further comprises: a first adhesive layer, the first adhesive layer being located between the reflective layer and the second substrate;

[0023] The first adhesive layer is used to bond the reflective layer and the second substrate. The first adhesive layer is mixed with a light-absorbing material to absorb part of the incident light.

[0024] By providing a first adhesive layer, the present application can ensure that ambient light is absorbed when incident on the first adhesive layer, thereby avoiding the influence of ambient light on the projection effect and improving the contrast of the projected image.

[0025] In some embodiments of the present application, the projection screen further comprises: a second adhesive layer, the second adhesive layer being located between the first surface of each lens unit of the optical microstructure and the first substrate;

[0026] The second adhesive layer is used to adhere the first surface of each lens unit to the first substrate. The second adhesive layer is mixed with a light-absorbing material to absorb part of the incident light.

[0027] By providing a second adhesive layer, the present application can absorb ambient light when it is incident on the second adhesive layer, thereby avoiding the influence of ambient light on the projection effect and improving the contrast of the projected image.

[0028] In some embodiments of the present application, the projection screen further comprises: a first diffusion layer and a second diffusion layer;

[0029] The first diffusion layer is located on a side of the first substrate away from the second adhesive layer; the second diffusion layer is located on a side of the second substrate away from the first adhesive layer; both the first diffusion layer and the second diffusion layer are used to diffuse light.

[0030] By providing a first diffusion layer and a second diffusion layer, the present invention can diversify the angles of light emitted after passing through the first and second diffusion layers, thereby ensuring that the light ultimately emitted from the projection screen has a certain divergence angle, thereby increasing the viewing angle of the audience when viewing the projected image. This also helps to suppress the generation of laser speckle and optimize the projected image.

[0031] In some embodiments of the present application, the first angle range includes the angle at which the first projection beam is emitted from the bottom of the projection screen to an obliquely upward direction; the second angle range includes the angle at which the second projection beam is emitted from the top of the projection screen to an obliquely downward direction.

[0032] By setting the incident angle of the first projection beam, the present application can realize the application scenario of desktop projection of the projection screen, and by setting the incident angle of the second projection beam, the application scenario of ceiling-mounted projection of the projection screen can be realized.

[0033] According to a second aspect of the present application, a projection system is provided, comprising:

[0034] Projection equipment, used for emitting projection light; and

[0035] A projection screen, located on the light-emitting side of the projection device, wherein the projection screen is any of the above-mentioned bidirectional projection screens;

[0036] Wherein, the projection device includes:

[0037] A three-color laser light source device for emitting three-primary-color lasers;

[0038] a light modulation component, located on the light-emitting side of the three-color laser light source device, for modulating the laser light emitted by the three-color laser light source device; and

[0039] The projection lens is located on the light-emitting side of the light modulation component. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings introduced below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 A schematic diagram of the structure of the projection system provided in an embodiment of the present application;

[0042] Figure 2 One of the structural schematic diagrams of the projection screen provided in an embodiment of the present application;

[0043] Figure 3 A schematic diagram of the planar structure of a Fresnel lens layer provided in an embodiment of the present application;

[0044] Figure 4 The second structural diagram of the projection screen provided in the embodiment of the present application;

[0045] Figure 5 The embodiment of this application provides Figure 3 Schematic diagram of the cross-sectional structure in the direction of the symmetry axis II';

[0046] Figure 6 A schematic diagram of the planar structure of each lens unit provided in an embodiment of the present application;

[0047] Figure 7 The third structural diagram of the projection screen provided in the embodiment of the present application;

[0048] Figure 8 The fourth structural diagram of the projection screen provided in the embodiment of the present application;

[0049] Figure 9 The fifth structural diagram of the projection screen provided in the embodiment of the present application;

[0050] Figure 10 The sixth structural diagram of the projection screen provided in the embodiment of the present application;

[0051] Figure 11 The seventh structural diagram of the projection screen provided in the embodiment of the present application;

[0052] Figure 12 The eighth structural diagram of the projection screen provided in the embodiment of the present application;

[0053] Figure 13 A ninth structural diagram of a projection screen provided in an embodiment of the present application;

[0054] Figure 14 A schematic diagram of the structure of the projection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0055] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application will be further described below with reference to the accompanying drawings and examples. However, the example embodiments can be implemented in various forms and should not be understood as being limited to the embodiments set forth herein; on the contrary, these embodiments are provided to make the present application more comprehensive and complete, and to fully convey the concepts of the example embodiments to those skilled in the art. The same figure marks in the figures represent the same or similar structures, and their repeated descriptions will be omitted. The words expressing position and direction described in this application are all explained using the accompanying drawings as examples, but changes can be made as needed, and all changes are included in the scope of protection of this application. The drawings in this application are only used to illustrate relative position relationships and do not represent true proportions.

[0056] With the continuous development of projection technology, laser is leading a new visual revolution due to its unique advantages, such as high brightness, wide color gamut, and excellent color reproduction. As laser projection technology is favored by more and more consumers, products such as laser cinemas, laser TVs, and projection screens have a huge market potential.

[0057] like Figure 1 As shown, the projection system includes: a projection device 2 and a projection screen 1.

[0058] The projection screen 1 is located on the light-emitting side of the projection device 2, and the audience faces the projection screen 1. The projection device 2 emits projection light, which is incident on the projection screen 1 and then emitted toward the audience through the projection screen 1, so that the audience can see the projected image.

[0059] When projection device 2 and the audience are located on the same side of projection screen 1, the projection system is called a front projection system. When projection device 2 and the audience are located on opposite sides of projection screen 1, the projection system is called a rear projection system. In a front projection system, projection device 2 emits projection light toward projection screen 1, which then reflects the projection light toward the audience, allowing them to view the projected image. In a rear projection system, projection device 2 emits projection light toward projection screen 1, which then passes through projection screen 1 toward the audience, allowing them to view the projected image.

[0060] This embodiment of the present application uses a telephoto projection system as an example to specifically illustrate the structure of the projection screen. Projection screen 1 can be mounted on a wall or hung high, or it can be integrated with a projection device to form a display device. When in use, projection device 2 can be located below projection screen 1, emitting projection light diagonally upward from below the projection screen 1; alternatively, projection device 2 can be located above projection screen 1, emitting projection light diagonally downward from above the projection screen 1.

[0061] like Figure 1 As shown, the projection screen 1 is usually rectangular in shape. When in use, the side edges of its bottom and top are usually parallel to the horizontal direction x, and the side edges on both sides are parallel to the vertical direction y. The horizontal direction x and the vertical direction y are perpendicular to each other. The embodiment of the present application is illustrated by taking the projection device 2 as an example in which it is set at a position close to the side edge of the bottom of the projection screen 1.

[0062] Figure 2 A projection screen for use with a front projection system, such as Figure 2 As shown, the projection screen includes: a surface layer 10 , a Fresnel lens layer 12 and a reflective layer 13 .

[0063] The surface layer 10 may be located on the outermost surface of the projection screen. In some embodiments, the surface layer 10 is located on the side closest to the audience, and plays a role in protecting the projection screen.

[0064] like Figure 2 and Figure 3 As shown, the Fresnel lens layer 12 is located on the side of the surface layer 10 away from the audience. The Fresnel lens layer 12 includes a plurality of lens units 12-1 arranged according to a set rule. Figure 3 As shown, multiple lens units 12-1 can form concentric circles that expand radially in sequence. When the projection screen is used in a telephoto projection system, the centers O of the concentric lens units 12-1 are typically not located within the projection screen. When the projection device emits projection light from below the projection screen, the centers O of each lens unit 12-1 are located below the side edge of the bottom of the projection screen and on the extension of the projection screen's axis of symmetry II'. The radius of the lens units 12-1 gradually increases from the bottom to the top of the projection screen, and the projection screen does not contain completely circular lenses, but only partially arc-shaped lenses.

[0065] like Figure 2 As shown, each lens unit 12-1 includes a connected lens surface x1 and a non-lens surface x2. Lens surface x1 is tilted relative to the plane of the projection screen. The tilt angle of lens surface x1 is set according to the incident angle of the projection light. This is used to reflect the outgoing light L of the projection device toward the viewer when it enters the reflective layer 13 on the surface of lens surface x1. The non-lens surface x2 is connected to the lens surface x1.

[0066] The Fresnel lens layer 12 provided in the projection screen is beneficial for reflecting the projection light toward the front of the projection screen, thereby increasing the gain of the projection screen.

[0067] The reflective layer 13 at least covers the lens surface x1 of each lens unit 12-1 of the Fresnel lens layer 12. Since the inclination angle of the lens surface x1 of each lens unit 12-1 is in accordance with reflecting the incident projection light L toward the audience, and the reflective layer 13 covers the lens surface x1 of the lens unit 12-1 and has the same inclination angle as the lens surface x1, the incident projection light L can be reflected toward the audience according to the original design.

[0068] However, the above projection screen is only suitable for unidirectional projection, and the projection effect can only be displayed on one side of the projection screen. However, when bidirectional projection is required in special application scenarios such as shopping malls and outdoor areas, there is no bidirectional projection screen that can realize it.

[0069] In view of this, an embodiment of the present application provides a two-way projection screen. By setting the second surface of each lens unit of the optical microstructure to be tilted at a set angle relative to the first surface, a first projection light beam transmitted by the first substrate of the projection screen and a second projection light beam transmitted by the second substrate can both be reflected by the reflective layer to perform projection imaging, thereby realizing two-way projection of the projection screen.

[0070] like Figure 4 As shown, the bidirectional projection screen provided in an embodiment of the present application includes: a first substrate 111, an optical microstructure 112, a reflective layer 113, and a second substrate 114. The first substrate 111 can be located on the outermost surface of the first side of the projection screen, and the second substrate 114 can be located on the outermost surface of the second side of the projection screen. The first substrate 111 and the second substrate 114 respectively protect the two sides of the projection screen, wherein the first side of the projection screen is the front side of the projection screen, and the second side of the projection screen is the back side of the projection screen; alternatively, the first side of the projection screen is the back side of the projection screen, and the second side of the projection screen is the front side of the projection screen. The optical microstructure 112 is located on one surface of the first substrate 111, the reflective layer 113 is located on the surface of the optical microstructure 112 away from the first substrate 111, and the second substrate 114 is located on the side of the reflective layer 113 away from the optical microstructure 112.

[0071] The optical microstructure 112 comprises a plurality of lens units F. Each lens unit comprises a first surface x1, a second surface x2, and a third surface x3. The first surface x1 of each lens unit is parallel to the plane of the first substrate 111, the second surface x2 is inclined at a predetermined angle relative to the first surface x1, and the third surface x3 connects the first and second surfaces x1 and x2. A reflective layer 113 is located at least on the second surface x2 of each lens unit. In other words, the cross-section of the optical microstructure 112, along the vertical direction y of the projection screen, is a triangular structure.

[0072] The projection device is located on a first side of the projection screen. When a first projection beam L1 emitted by the projection device enters the projection screen along a first angular range, the first projection beam L1 is refracted by the first substrate 111 and then enters the first surface x1 of the optical microstructure 112. The first projection beam L1 then passes through the first surface x1 and the second surface x2 of the optical microstructure 112, and is then reflected by the reflective layer 113 on the second surface x2 of the optical microstructure 112, and then exits from one side of the first substrate 111. When the projection device is located on a second side of the projection screen and a second projection beam L2 emitted by the projection device enters the projection screen along a second angular range, the second projection beam L2 is refracted by the second substrate 114, and then is reflected by the reflective layer 113 on the second surface x2 of the optical microstructure 112, and then exits from one side of the second substrate 114.

[0073] Figure 5For projection screen edge Figure 3 Schematic diagram of the cross-sectional structure in the direction of the symmetry axis II'.

[0074] like Figure 5 As shown, the projection device is placed on the first side of the projection screen as an example. The projection device is located at the middle position below the projection screen and emits a projection light L1 toward the projection screen. Since the position of the projection device is fixed, the incident angle and direction of the projection light L1 are different when it enters different positions of the projection screen. In order to make the projection light be reflected toward the position where the audience is, as shown in FIG. Figure 6 The schematic planar structure of each lens unit shown shows that the lens units are designed to extend along the horizontal direction x of the projection screen and to be arranged sequentially along the vertical direction y of the projection screen. Furthermore, the inclination angle of the second surface x2 of each lens unit relative to the first surface x1 is different. In this embodiment of the present application, the inclination angle of the second surface x2 of each lens unit relative to the first surface x1 gradually increases from bottom to top along the vertical direction y of the projection screen.

[0075] by Figure 5 For example, the tilt setting angles of the second surface x2 of the same lens unit at different positions vary, so the tilt setting angles of the second surface x2 of each lens unit along different directions are not comparable, but along the same direction, such as Figure 5 In the vertical direction y, the tilt setting angle of the second surface x2 of each lens unit increases sequentially, that is, the tilt setting angle of the second surface x2 of each lens unit along the vertical direction y satisfies: α1<α2<α3.

[0076] In some embodiments, the second surface x2 of each lens unit is tilted relative to the first surface x1 at a setting angle α that conforms to the following formula:

[0077] -7×10 -9 ×x 2 +0.0007x-3.0341≤α≤-7×10 -9 ×x 2 +0.0007x+2.9659;

[0078] Where x represents the vertical distance between the vertex of the first surface x1 of each lens unit and the bottom edge of the projection screen in the cross section of the projection screen from bottom to top in the vertical direction y. For example, Figure 5 The vertical distance between the vertex A of the first surface x1 of the middle lens unit and the vertical position B of the bottom edge of the projection screen.

[0079] Optionally, the second surface x2 of each lens unit is tilted at a setting angle α relative to the first surface x1 in the range of (0o, 20o). By setting the tilt setting angle α, the projection screen can achieve two-way projection. In addition, the projection screen is suitable for different projection modes such as desktop projection and ceiling projection. For example, when the projection device is on the first side of the projection screen and the projection device is a desktop projection, the first angle range of the first projection light beam irradiated to the projection screen may include the angle of the first projection light beam emitted from the bottom of the projection screen to the upper part. When the projection device is on the second side of the projection screen and the projection device is a ceiling projection, the second angle range of the second projection light beam irradiated to the projection screen may include the angle of the second projection light beam emitted from the top of the projection screen to the lower part. This is only an example, and the present application does not limit the different projection modes of the projection screen, such as desktop projection and ceiling projection, nor does it limit the first side of the projection screen to desktop projection or ceiling projection, and does not limit the second side of the projection screen to desktop projection or ceiling projection.

[0080] like Figure 5 As shown, when the projection device is on the first side of the projection screen, projection light L1 emitted by the projection device enters the projection screen, is reflected by reflective layer 113 after entering the projection screen, and then exits the projection screen in the direction of the audience. Simultaneously, ambient light C1 may also enter the projection screen. Similarly, some ambient light will be reflected when entering reflective layer 113 and exit from the projection screen. This reflected ambient light will interfere with the projection light, thereby reducing the contrast of the projected image.

[0081] In order to overcome the above problem, the film layer in the projection screen can be colored so that the colored film layer can absorb the incident ambient light and reduce the reflection of the ambient light.

[0082] like Figure 7 As shown, the projection screen further includes a second adhesive layer 115, which is located between the first surface x1 of each lens unit of the optical microstructure 112 and the first substrate 111. The second adhesive layer 115 can bond the first surface x1 of each lens unit to the first substrate 111. The second adhesive layer 115 is mixed with a light-absorbing material to absorb a portion of the incident light. By absorbing ambient light through the second adhesive layer 115, the projection device can reduce the impact of ambient light such as the ceiling on the projection effect when the projection screen is on the first side. For example, the second adhesive layer 115 can be colored by mixing a light-absorbing substance such as a dye or carbon black into the material of the second adhesive layer 115, so that the ambient light incident on the second adhesive layer 115 is absorbed.

[0083] like Figure 5As shown, when the projection device is on the second side of the projection screen, projection light L2 emitted by the projection device enters the projection screen, is reflected by reflective layer 113, and then exits the projection screen in the direction of the audience. Simultaneously, ambient light C2 may also enter the projection screen. Similarly, some ambient light will be reflected when entering reflective layer 113 and exit from the projection screen. This reflected ambient light will also interfere with the projection light, thereby reducing the contrast of the projected image.

[0084] In order to overcome the above problem, the film layer in the projection screen can still be colored, so that the colored film layer can absorb the incident ambient light and reduce the reflection of the ambient light.

[0085] like Figure 8 As shown, the projection screen further includes a first adhesive layer 116, which is positioned between the reflective layer 113 and the second substrate 114. The first adhesive layer 116 bonds the reflective layer 113 to the second substrate 114. A light-absorbing material is mixed into the first adhesive layer 116 to absorb a portion of incident light. By absorbing ambient light through the first adhesive layer 116, the projection device can reduce the impact of ambient light, such as from the ceiling, on the projection effect when the projection screen is on the second side. For example, the first adhesive layer 116 can be colored by mixing a light-absorbing substance, such as a dye or carbon black, into the material of the first adhesive layer 116, thereby absorbing ambient light when it enters the first adhesive layer 116.

[0086] In some embodiments, as Figure 9 As shown, the projection screen further includes a light-transmitting dielectric layer 117, which is located on the surface of the first substrate 111 away from the second adhesive layer 115. A light-absorbing material may be mixed into the light-transmitting dielectric layer 117. Light-absorbing materials absorb incident light. In a specific implementation, the light-absorbing material may be a dark substance such as carbon black or a dye. The light-absorbing material mixed into the projection screen gives the screen a dark appearance, enhancing the black brightness of the projection screen. The light-absorbing material mixed into the light-transmitting dielectric layer 117 absorbs ambient light, thereby improving the contrast of the projected image to a certain extent.

[0087] The first adhesive layer 116 and the second adhesive layer 115 may be made of acrylic or silicone adhesives, or UV curable resin materials, or resin materials with adhesive properties, such as pressure sensitive adhesives (PSA), which are not limited here.

[0088] In some embodiments, as Figure 9As shown, the surface of the light-transmitting dielectric layer 117 facing away from the first substrate 111 is roughened. As mentioned above, the projection light entering the projection screen, after being reflected by the reflective layer 113 and emitted outside the projection screen, has a narrow viewing angle, resulting in a narrow viewing range for the projected image. By making the outermost surface of the light-transmitting dielectric layer 117 rough, the projection light is diffused before emission, thereby increasing the projection angle and the viewing angle of the projection screen. Furthermore, by providing a certain degree of diffusivity on the projection screen surface, when the projection system uses a laser light source, it helps suppress the formation of laser speckle and optimize the projected image.

[0089] Current projection systems typically use laser light sources. Lasers have high collimation, resulting in a small divergence angle for the projected light. The highly collimated light reflected from the projection screen also results in a narrow field of view. By adding a diffusion layer, the angle of light emitted after passing through it can be diversified, resulting in a certain divergence angle for the light ultimately emitted from the projection screen, increasing the viewer's field of view for the projected image. Furthermore, the diffusion layer helps suppress laser speckle and optimize the projected image.

[0090] In some embodiments, as Figure 10 and Figure 11 As shown, the projection screen may also include a first diffusion layer 118, located on the surface of the first substrate 111 facing away from the second adhesive layer 115. First diffusion layer 118 is a separate film layer that diffuses light, allowing the projection light emitted from the projection screen to have a certain divergence angle, thereby increasing the viewing angle of the projected image for the viewer. Furthermore, first diffusion layer 118 helps suppress laser speckle and optimize the projected image.

[0091] like Figure 10 As shown, the first diffusion layer 118 may be a diffusion material 119 located on the surface of the first substrate 111. The diffusion material may be formed on the surface of the first substrate 111 by a process such as sandblasting.

[0092] Or, as Figure 11 As shown, the first diffusion layer 118 may include a first substrate 111 and a diffusion material 119 located on one surface of the first substrate 111 ; wherein the diffusion material 119 is located on the surface of the first substrate 111 facing away from the second adhesive layer 115 .

[0093] In some embodiments, as Figure 12 and Figure 13As shown, the projection screen may also include a second diffusion layer 120, located on the side of the second substrate 114 away from the first adhesive layer 116. The second diffusion layer 120 is a separate film layer that diffuses light, allowing the projection light emitted from the projection screen to have a certain divergence angle, thereby increasing the viewing angle of the projected image for the viewer. Furthermore, the second diffusion layer 120 helps suppress laser speckle and optimize the projection image.

[0094] like Figure 12 As shown, the second diffusion layer 120 may be a diffusion material 121 located on the surface of the second substrate 114. The diffusion material may be formed on the surface of the second substrate 114 by a process such as sandblasting.

[0095] Or, as Figure 13 As shown, the second diffusion layer 120 may include a second substrate 114 and a diffusion material 121 located on one surface of the second substrate 114 ; wherein the diffusion material 121 is located on the surface of the second substrate 114 facing away from the first adhesive layer 116 .

[0096] The diffusion material 119 and the diffusion material 121 may be, but are not limited to, silicon dioxide particles, aluminum oxide particles, titanium oxide particles, cerium oxide particles, zirconium oxide particles, tantalum oxide particles, zinc oxide particles, magnesium fluoride particles, and the like.

[0097] The first substrate 111 can be made of materials such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC), polymethyl methacrylate (PMMA), triacetylcellulose (TAC), cycloolefin polymer (COP), thermoplastic polyurethane (TPU), polyvinyl chloride (PVC), polyimide (PI), polyamide (PA), polyethylene (PE), and polypropylene (PP). When used as a projection screen in special applications such as shopping malls, the first substrate 111 can also be made of materials such as glass.

[0098] The second substrate 114 can also be made from the aforementioned materials. The first substrate 111 can be made of the same material as the second substrate 114, or a different material. The reflective layer 113 can be printed or sprayed onto the second surface x2 of each lens unit. The reflective layer 113 can be a mixture of aluminum powder and resin, or a reflective coating produced by other processes. This is merely an example, and this application does not limit the specific material composition of the above structure.

[0099] Based on the same concept, the embodiment of the present application also provides a projection system, such as Figure 1 As shown, the projection system includes: a projection device 2 and a projection screen 1 located on the light-emitting side of the projection device 2 .

[0100] like Figure 14 As shown, the projection device includes: a light source device 21, an illumination optical path 22, a display element 23, and a lens 24. The illumination optical path 22 is located on the light exit side of the light source device 21, the display element 23 is located on the light exit side of the illumination optical path 22, and the lens 24 is located on the light exit side of the display element 23.

[0101] The light source device 21 can be a laser light source device. The laser light source device can be a monochromatic laser, a laser that can emit laser light of multiple colors, or multiple lasers that emit laser light of different colors. When the laser light source device uses a monochromatic laser, the laser display device also needs to be provided with a color wheel, which is used for color conversion. The monochromatic laser combined with the color wheel can achieve the purpose of emitting primary color lights of different colors in a time sequence. When the laser light source device uses a laser that can emit laser light of multiple colors, it is necessary to control the laser light source to emit laser light of different colors as primary color lights in a time sequence.

[0102] In the embodiments of the present application, the light source device may employ a three-color laser light source device. This three-color laser light source device may be a laser that emits three primary colors of laser light, such as an MCL laser. Alternatively, it may include a red laser, a green laser, and a blue laser that emit three primary colors of laser light, respectively. Using a three-color laser light source device improves the color gamut of the projected image, providing better color expression and accurately reproducing the input image.

[0103] The illumination light path 22 is located on the light-emitting side of the light source device 21. The illumination light path 22 collimates the light emitted by the light source device 21 and allows the light emitted by the light source device 21 to be incident on the display element 23 at a suitable angle. The illumination light path 22 may include multiple lenses or lens groups, which are not limited here.

[0104] Display element 23 is used to modulate incident light. In a specific implementation, display element 23 can employ a digital micromirror device (DMD). After passing through illumination optical path 22, the light beam conforms to the illumination size and incident angle required by the DMD. The DMD surface includes numerous tiny mirrors, each of which can be individually driven to deflect. By controlling the DMD's deflection angle, the brightness of the light incident on lens 24 is controlled.

[0105] The lens 24 is used to form an image of the light emitted from the display element 23 . After the light is formed by the lens 24 , the image is projected.

[0106] In the embodiment of the present application, the projection device 2 may be a telephoto projection device, that is, the lens 24 in the projection device is a telephoto lens.

[0107] Projection screen 1 is located on the light-emitting side of the lens in the projection device. It comprises a first substrate, an optical microstructure, a reflective layer, and a second substrate. The optical microstructure includes multiple lens units, each of which comprises a first surface, a second surface, and a third surface. The first surface of each lens unit is parallel to the plane of the first substrate, the second surface is inclined at a set angle relative to the first surface, and the third surface connects the first and second surfaces. A reflective layer is located on at least the second surface of each lens unit. A first projection beam enters the projection screen through one side of the first substrate, is reflected by the reflective layer on the optical microstructure, and exits from the first substrate side of the projection screen. A second projection beam enters the projection screen through one side of the second substrate, is reflected by the reflective layer, and exits from the second substrate side of the projection screen. This achieves bidirectional projection on the projection screen.

[0108] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0109] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A two-way projection screen, characterized in that: include: a first substrate, configured to transmit the first projection light beam; an optical microstructure, located on one side surface of the first substrate; a reflective layer, located on a surface of the optical microstructure away from the first substrate; a second substrate, located on a side of the reflective layer away from the optical microstructures, and configured to transmit a second projection light beam to the reflective layer; The optical microstructure includes a plurality of lens units, each lens unit including a first surface, a second surface, and a third surface. The first surface of each lens unit is parallel to the plane of the first substrate, the second surface is inclined at a set angle relative to the first surface, and the third surface connects the first surface and the second surface. The reflective layer is located at least on the second surface of each lens unit. When the first projection light beam is incident on the projection screen along a first angle range, the first projection light beam enters the projection screen through a side of the first substrate, is reflected by the reflective layer on the optical microstructure, and is emitted from a side of the first substrate of the projection screen; When the second projection beam enters the projection screen along a second angle range, the second projection beam enters the projection screen through one side of the second substrate, is reflected by the reflective layer, and exits from one side of the second substrate of the projection screen.

2. The two-way projection screen according to claim 1, characterized in that: The second surface of each lens unit is inclined relative to the first surface at an angle α that conforms to the following formula: -7×10 -9 ×x 2 +0.0007x-3.0341≤α≤-7×10 -9 ×x 2 +0.0007x+2.9659; Here, x represents the vertical distance between the vertex of the first surface of each lens unit and the bottom edge of the projection screen in a vertical cross section from bottom to top of the projection screen.

3. The two-way projection screen according to claim 2, characterized in that: The second surface of each lens unit is inclined relative to the first surface at a setting angle α within a range of (0°, 20°).

4. The two-way projection screen according to claim 3, characterized in that: As the projection screen moves from bottom to top, the second surface of each lens unit is inclined at a setting angle α that gradually increases relative to the first surface.

5. The two-way projection screen according to claim 4, characterized in that: Each lens unit of the optical microstructure extends along the horizontal direction of the projection screen and is arranged in sequence along the vertical direction of the projection screen, and the horizontal direction and the vertical direction are perpendicular to each other.

6. The two-way projection screen according to claim 1, characterized in that: The projection screen further includes: a first adhesive layer, the first adhesive layer being located between the reflective layer and the second substrate; The first adhesive layer is used to bond the reflective layer and the second substrate. The first adhesive layer is mixed with a light-absorbing material to absorb part of the incident light.

7. The two-way projection screen according to claim 6, characterized in that: The projection screen further includes: a second adhesive layer, the second adhesive layer being located between the first surface of each lens unit of the optical microstructure and the first substrate; The second adhesive layer is used to adhere the first surface of each lens unit to the first substrate. The second adhesive layer is mixed with a light-absorbing material to absorb part of the incident light.

8. The two-way projection screen according to claim 7, characterized in that: The projection screen further comprises: a first diffusion layer and a second diffusion layer; The first diffusion layer is located on a side of the first substrate away from the second adhesive layer; the second diffusion layer is located on a side of the second substrate away from the first adhesive layer; both the first diffusion layer and the second diffusion layer are used to diffuse light.

9. The two-way projection screen according to claim 1, characterized in that: The first angle range includes the angle at which the first projection light beam is emitted from the bottom of the projection screen to the oblique upper direction; the second angle range includes the angle at which the second projection light beam is emitted from the top of the projection screen to the oblique lower direction.

10. A projection system, characterized in that: include: A projection device, for emitting projection light; and a projection screen, located on the light-emitting side of the projection device, wherein the projection screen is the bidirectional projection screen according to any one of claims 1 to 9; Wherein, the projection device includes: A three-color laser light source device for emitting three-primary-color lasers; a light modulation component, located on the light-emitting side of the three-color laser light source device, for modulating the laser light emitted by the three-color laser light source device; and The projection lens is located on the light-emitting side of the light modulation component.

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