A double-sided projection screen and a double-sided projection system having the same

Abstract

The present invention relates to a double-sided projection screen. The double-sided projection screen includes a transparent projection layer and a rear projection layer arranged in parallel. The transparent projection layer performs diffuse reflection on preset reflected light to achieve front projection while presenting the real-world environment behind the screen. The rear projection layer can freely switch between a fog state and a transparent state. The present invention also provides a double-sided projection system using the double-sided projection screen. The projection system can achieve bilateral projection with a single projector, satisfying the viewing needs of both internal and external personnel. The projection system can freely switch between front projection and rear projection as needed. The fog state effect of its rear projection technology can also play an anti-theft function and can be applied to scientific and technological venues such as shopping malls, museums, exhibition halls, and showrooms.

Description

Technical Field

[0001] The invention relates to a double-sided projection screen, in particular to a double-sided projection screen and a double-sided projection system having the screen. Background Art

[0002] In modern society, projection technology is widely used in business, education, entertainment, family and other fields, and has become an indispensable means of information dissemination in many occasions. In order to achieve a good projection display effect, in addition to choosing a suitable projector, the choice of projection screen is also very important. Currently, the common projection screens on the market can be divided into glass bead screens, white plastic screens, gray optical screens, metal screens, etc. according to the texture of the screen surface. Usually, projection screens are divided into front projection and rear projection. Front projection means that the projector and the observer are on the same side of the screen, and rear projection means that the observer and the projector are on both sides of the screen.

[0003] Transparent display technology has developed rapidly in recent years and has occupied an increasing share in the display field. Conventional ones include holographic films, transparent OLEDs, transparent LEDs, etc. This type of transparent display is expensive and usually has a single direction. The image on the other side is usually blurry or unclear, which greatly limits the application scenarios. There are some opaque curtains on the market that can achieve double-sided projection imaging, but they cannot provide transparent display effects. PDLC dimming glass or PDLC film (polymer dispersed liquid crystal film) can switch freely between transparent and foggy states. It can be used as a rear projection film in the foggy state, but it cannot achieve transparent projection.

[0004] Currently, projection screens with transparent displays cannot balance projection effect and transparency, and cannot achieve double-sided projection, let alone free switching between front projection and rear projection and other application scenarios. Summary of the invention

[0005] The main purpose of the present invention is to produce a double-sided projection product to achieve double-sided projection and to realize free switching between front projection and rear projection as needed.

[0006] The following describes and illustrates the embodiments of the present invention and its purpose by way of examples and in combination with systems, tools and methods. These examples are exemplary and illustrative only, not restrictive. In various embodiments, one or more of the above market needs have been met by the present invention, while other embodiments are directed to other improvements.

[0007] One aspect of the present invention provides a double-sided projection screen, which includes a transparent projection layer and a rear projection layer arranged in parallel. The transparent projection layer diffusely reflects preset reflected light to achieve front projection while presenting the real world environment behind the screen. The rear projection layer can switch freely between a foggy state and a transparent state.

[0008] As a further improvement of the present application, the transparent projection layer is a transparent optical thin film layer, and the transparent optical thin film layer includes a base layer, a random structure layer, a coating layer, and a refractive index matching layer.

[0009] As a further improvement of the present application, the random structure layer is made of an optical resin.

[0010] As a further improvement of the present application, the optical resin is any one of acrylic resin, polyurethane resin, and silicone rubber.

[0011] As a further improvement of the present application, the process for preparing the random structure layer is any one of offset printing, transfer printing, extrusion, and coating.

[0012] As a further improvement of the present application, the process for curing the random structure layer is at least one of thermal curing, light curing, and EB curing.

[0013] As a further improvement of the present application, the process for preparing the coating layer is any one of magnetron sputtering, evaporation coating, or other physical vapor deposition.

[0014] As a further improvement of the present application, the refractive indices of the random structure layer and the refractive index matching layer are substantially the same.

[0015] As a further improvement of the present application, the distance between the transparent optical thin film layer and the rear projection layer is not greater than 2 mm.

[0016] As a further improvement of the present application, the reflectivity of the transparent optical thin film layer is 10% - 70%.

[0017] As a further improvement of the present application, the rear projection layer is a flexible rear projection layer or a rigid rear projection layer.

[0018] As a further improvement of the present application, the rigid rear projection layer is a glass-based liquid crystal dimming device; the flexible rear projection layer is any one of a PDLC film and a holographic film.

[0019] As a further improvement of the present application, the glass-based liquid crystal dimming device is any one of a PDLC dimming glass and a bistable dimming device.

[0020] As a further improvement of the present application, a support layer is further provided between the transparent optical thin film layer and the flexible rear projection layer, or outside the transparent layer, or outside the flexible rear projection layer.

[0021] As a further improvement of the present application, the support layer is made of any one of ultra-clear glass, tempered glass, anti-reflection glass, and acrylic material.

[0022] As a further improvement of the present application, the transparent projection layer and the rear projection layer are fixedly arranged in parallel together through a fixing adhesive layer or a bracket.

[0023] As a further improvement of the present application, the reflectivity of the fixing adhesive layer is 10% - 80%.

[0024] As a further improvement of the present application, the process for forming the fixing adhesive layer is at least one of the lamination process and the back - coating process.

[0025] As a further improvement of the present application, the film in the lamination process is any one of an EVA film and a PVB film; the equipment in the lamination process is any one of a laminating furnace, a laminator, and an autoclave.

[0026] As another aspect of the present application, a dual - sided projection system is further provided. The dual - sided projection system includes a projector and a dual - sided projection screen, and the dual - sided projection screen is the dual - sided projection screen described above.

[0027] The beneficial effects of the present application are as follows: The present application provides a dual - sided projection screen, which includes a transparent projection layer and a rear projection layer arranged in parallel. The transparent projection layer performs diffuse reflection on the preset reflected light to achieve front - projection while presenting the real - world environment behind the screen, and the rear projection layer can freely switch between a fog state and a transparent state. A dual - sided projection system applying the above - mentioned dual - sided projection screen is also provided. This projection system can freely switch between front - projection and rear - projection according to needs, and the fog - state effect of its rear - projection technology can also play a role in anti - theft, and can be applied to scientific and technological places such as shopping malls, museums, exhibition halls, and showrooms. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention can be better understood by referring to the schematic illustrations of the embodiments of the present invention. In the drawings:

[0029] Figure 1 It is a schematic structural diagram of an embodiment of a dual - sided projection screen;

[0030] Figure 2 It is a schematic structural diagram of an embodiment of a transparent optical thin - film layer;

[0031] Figure 3 It is a schematic structural diagram of another embodiment of a dual - sided projection screen;

[0032] Figure 4 It is a schematic structural diagram of another embodiment of a dual - sided projection screen;

[0033] Figure 5 It is a schematic structural diagram of another embodiment of a dual - sided projection screen;

[0034] Figure 6 Schematic structural diagram of a dual-sided projection system;

[0035] In the figure: 01, dual-sided projection screen; 1, transparent projection layer; 2, rear projection layer; 3, transparent optical thin film layer; 4, support layer; 5, fixing adhesive layer; 10, base layer; 11, random structure layer; 12, coating layer; 13, refractive index matching layer; 010, projector; 011, incident light source; 012, diffuse reflection light; 013, scattered light; 014, observer; 015, observer. Specific embodiments

[0036] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments, and are not used to limit the scope of the present invention. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0037] The embodiments disclosed in the present application relate to a dual-sided projection screen, as Figure 1 shown, the dual-sided projection screen 01 includes a transparent projection layer 1 and a rear projection layer 2 arranged in parallel. The transparent projection layer 1 performs diffuse reflection on preset reflected light to achieve front projection while presenting the real-world environment behind the screen. That is, when the transparent projection layer 1 is used as a screen for front projection, it also has a transparent property, and the real-world environment behind it can be seen through the transparent projection layer. The rear projection layer 2 freely switches between a fog state and a transparent state.

[0038] In the present application, as a preferred embodiment, the transparent projection layer 1 is a transparent optical thin film layer 3, as Figure 2As shown, the transparent optical thin film layer 3 includes a base layer 10, a random structure layer 11, a coating layer 12, and a refractive index matching layer 13. As a preferred embodiment, the refractive indices of the random structure layer 11 and the refractive index matching layer 13 are substantially the same. As a preferred embodiment, the random structure layer 11 is made of an optical resin, and the optical resin can be, but is not limited to, any one of acrylic resin, polyurethane resin, and silica gel. Among them, acrylic resin is the general term for polymers of acrylic acid, methacrylic acid, and their derivatives; polyurethane resin (polyurethane) is a polymer composed of polyols and isocyanates, which has strong adhesion to various substrates, high elasticity, and good wear resistance. As a preferred embodiment, the process for preparing the random structure layer 11 can be, but is not limited to, any one of offset printing, transfer printing, extrusion, slot die coating, and spin coating. Among them, the random structure layer 11 can be a transparent optical resin film with a predetermined surface microstructure, and its preparation method can be realized by using any wet coating process. As a preferred embodiment of the present application, the process for curing the random structure layer 11 can be, but is not limited to, at least one of thermal curing, light curing, and EB curing. As a preferred embodiment of the present application, the process for preparing the coating layer 12 can be, but is not limited to, any one of magnetron sputtering, evaporation coating, or other physical vapor depositions.

[0039] In the present application, a preferred embodiment of the preparation process of the transparent optical thin film layer 3 is also provided, and the specific steps are as follows: First, prepare the random structure layer 11: Use a template with any random shape or a surface microstructure with certain patterns, place a base layer 10 under it, and place an optically transparent resin between the two. The optically transparent resin will conform to the microstructure of the template, and the deposited optically transparent resin film can be cured via a photoinitiation process, a thermal curing process, or a combination of these two curing processes. After the optically transparent resin is cured, the optically transparent resin film is peeled off from the template to obtain the random structure layer 11 with a surface microstructure. Second, prepare the coating layer 12: Coat a film on the surface of the random structure layer 11 to obtain the coating layer 12. Finally, prepare the refractive index matching layer 13: Coating another layer of optical resin on the coating layer 12 by using a wet coating process.

[0040] In the present application, in order to prevent the phenomenon of double images when the front projection of the double-sided projection screen, as a preferred embodiment, the distance between the transparent optical thin film layer 3 and the rear projection layer 2 is not greater than 2 mm. In order to ensure the high definition of the front projection of the double-sided projection screen, as a further preferred embodiment, the reflectivity of the transparent optical thin film layer 3 is 10% - 70%.

[0041] In this application, as a preferred embodiment, the transparent projection layer 1 and the rear projection layer 2 are fixedly arranged in parallel through a fixing adhesive layer 5 or a bracket; as a further preferred embodiment, the reflectivity of the fixing adhesive layer 5 is 10% to 80%. As a preferred embodiment, the process for forming the fixing adhesive layer 5 is at least one of the lamination process and the back adhesive process. As a still further preferred embodiment, in the lamination process, the film 2 used can be, but is not limited to, any one of an EVA film and a PVB film; the equipment used for the lamination process can be, but is not limited to, any one of a laminating furnace, a laminator, and an autoclave.

[0042] In this application, as a preferred embodiment, the rear projection layer 2 is any one of a rigid rear projection layer and a flexible rear projection layer. As a further preferred embodiment, the rigid rear projection layer can be, but is not limited to, a glass-based liquid crystal dimming device. As a still further preferred embodiment, the glass-based liquid crystal dimming device can be, but is not limited to, any one of a PDLC dimming glass, a bistable dimming device, and a bistable liquid crystal dimming device, etc. The bistable dimming device is a bistable dimming glass based on cholesteric liquid crystal. As a further preferred embodiment, the flexible rear projection layer can be, but is not limited to, any one of a PDLC film and a holographic film.

[0043] In this application, as a preferred embodiment, as Figures 3-4 shown, a support layer 4 is further provided between the transparent optical thin film layer and the flexible rear projection layer, or outside the transparent layer, or outside the flexible rear projection layer. The support layer 4 can be made of, but is not limited to, any one of ultra-clear glass, tempered glass, anti-reflection glass, and plexiglass, wherein the plexiglass can be, but is not limited to, acrylic materials. In addition, according to the set position of the support layer 4, considering factors such as the reflectivity and ghosting of the double-sided projection screen, the thickness of the support layer 4 can be 2 mm to 5 mm, such as 2 mm, 3 mm, 4 mm, 5 mm, etc., but is not limited to the above thicknesses.

[0044] In this application, a preferred embodiment for preparing a double-sided projection screen by the lamination process is further provided, and the specific steps are as follows: As Figures 3 to 5 for the double-sided projection screen, the fixing adhesive layer 5 is preferably an EVA film. A double-sided projection screen is made using a laminating furnace. In the lamination process, we set the temperature gradient to rise from 60 °C to 120 °C, and the duration of the whole process is 90 minutes. After cooling, the double-sided projection screen is obtained. In addition, it is also possible to laminate a single film (the transparent optical thin film layer 3 or the rear projection layer 2), and the other film is directly attached to the surface of the support layer 4 through the back adhesive process; or both films are attached to both sides of the support layer 4 by the back adhesive method.

[0045] In this application, as a preferred embodiment, a dual-sided projection system is further provided. The dual-sided projection system includes a projector and a dual-sided projection screen 01. The dual-sided projection screen 01 is the above-mentioned dual-sided projection screen 01, and the dual-sided projection screen 01 is as Figure 1 , Figures 3 to 5 shown. As Figure 6 shown, the prepared transparent dual-sided projection screen 01 is installed on a bracket or a wall. The projector 010 projects and outputs light 011 to project an image onto the transparent dual-sided projection screen 01, and diffuse reflection light 012 is formed through the reflection of the screen. The diffuse reflection light 012 forms a bright and uniform observation area in the direction where the observer 014 is located. When we drive the rear projection layer 2 to the transparent state, the observer 014 can simultaneously see the projected image and the object behind the screen within the observation area. When we drive the rear projection layer 2 to the fog state, the output light 011 of the projector 010 projects the image onto the transparent dual-sided projection screen 01. When the light reaches the rear projection layer 2, since the rear projection layer 2 is in the fog state, the light scatters here to form scattered light 013, and the observer 015 on the outdoor side can also see a clear image.

[0046] When the above dual-sided projection system is applied to places such as display window glass, during the day, we can perform indoor projection while maintaining transparency, combining the real and the virtual; at night, we can project the picture to the outdoor side to attract consumers, and when the store door is closed and other situations occur, adjust the dimming product to the dark state to play a role in preventing theft.

[0047] Although this application mainly describes the embodiments of the present invention with a core structure of two layers (transparent projection layer 1 and rear projection layer 2), those skilled in the art should understand that within the protection scope of the present invention, it is not excluded that there may be other layers on any side of the transparent projection layer 1 or the rear projection layer 2, such as: bonding layer, adhesive layer, strengthening layer, antireflection layer, absorption layer, antireflection coating layer, etc. And those skilled in the art should understand that these layers can be understood as part of the transparent projection layer 1 or the rear projection layer 2.

[0048] In addition, those skilled in the art should understand that within the protection scope of the present invention, it is not excluded that there may be other layers between the transparent projection layer 1 and the rear projection layer 2, such as: bonding layer, adhesive layer, strengthening layer, antireflection layer, absorption layer, antireflection coating layer, etc. And those skilled in the art should understand that these layers can be understood as part of the transparent projection layer 1 or the rear projection layer 2.

[0049] In summary, the present application provides a double-sided projection screen. The double-sided projection screen 01 includes a transparent projection layer 1 and a rear projection layer 2 arranged in parallel. The transparent projection layer 1 performs diffuse reflection on preset reflected light to achieve front projection while presenting the real-world environment behind the screen. The rear projection layer 2 can freely switch between a fog state and a transparent state. When the double-sided projection screen 01 performs front projection, it can achieve transparent projection. When performing rear projection, it can display the required content to outdoor viewers. We can also utilize the fog state effect of the screen in the rear projection technology to play an anti-theft function. The present application also provides a double-sided projection system including the above-mentioned double-sided projection screen 01. This double-sided projection system can achieve bilateral projection by using a single projector 010, can satisfy the viewing of internal and external personnel, and presents the real-world environment behind the screen during front projection, realizing the combination of virtual and real. It can be applied to scientific and technological venues such as shopping malls, museums, exhibition halls, and exhibition rooms.

[0050] Although this specification is described according to embodiments, not every embodiment only includes an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0051] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present invention, and they are not used to limit the protection scope of the present invention. Any equivalent embodiments or changes made without departing from the technical spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-sided projection screen, characterized in that, The double-sided projection screen (01) includes a transparent projection layer (1) and a rear projection layer (2) arranged in parallel. The transparent projection layer (1) diffusely reflects preset reflected light to achieve front projection and at the same time presents the real-world environment behind the screen. The rear projection layer (2) can freely switch between a fog state and a transparent state. The transparent projection layer (1) is a transparent optical thin film layer (3). The transparent optical thin film layer (3) includes a base layer (10), a random structure layer (11), a coating layer (12), and a refractive index matching layer (13) that are sequentially stacked from bottom to top. The distance between the transparent optical thin film layer (3) and the rear projection layer (2) is not greater than 2 mm.

2. The double-sided projection screen according to claim 1, wherein The random structure layer (11) is prepared from an optical resin.

3. The double-sided projection screen according to claim 2, wherein The optical resin is any one of acrylic resin, polyurethane resin, and silicone.

4. The double-sided projection screen according to claim 1, characterized in that, The process for preparing the random structure layer (11) is any one of offset printing, transfer printing, extrusion, and coating.

5. The double-sided projection screen according to claim 1, wherein The process for curing the random structure layer (11) is at least one of thermal curing, light curing, and EB curing.

6. The double-sided projection screen according to claim 1, wherein, The process for preparing the coating layer (12) is any one of magnetron sputtering, evaporation coating, or other physical vapor deposition.

7. The double-sided projection screen according to claim 1, characterized in that, The refractive index of the random structure layer (11) is basically the same as that of the refractive index matching layer (13).

8. The double-sided projection screen according to any one of claims 1-7, characterized in that, The reflectivity of the transparent optical thin film layer (3) is 10% - 70%.

9. The double-sided projection screen according to claim 8, characterized in that, The rear projection layer (2) is a flexible rear projection layer or a rigid rear projection layer.

10. The double-sided projection screen according to claim 9, wherein, The rigid rear projection layer is a glass-based liquid crystal dimming device; the flexible rear projection layer is any one of a PDLC film and a holographic film.

11. The double-sided projection screen according to claim 10, wherein The glass-based liquid crystal dimming device is any one of a PDLC dimming glass and a bistable dimming device.

12. The double-sided projection screen according to claim 9, characterized in that, A support layer (4) is further provided between the transparent optical thin film layer and the flexible rear projection layer, or outside the transparent optical thin film layer, or outside the flexible rear projection layer.

13. The double-sided projection screen according to claim 12, wherein, The support layer (4) is made of any one of ultra-clear glass, tempered glass, anti-reflection glass, and acrylic material.

14. The double-sided projection screen according to claim 1, wherein The transparent projection layer (1) and the rear projection layer (2) are fixedly arranged in parallel through a fixing adhesive layer (5) or a bracket.

15. The double-sided projection screen according to claim 14, wherein, The reflectivity of the fixing adhesive layer (5) is 10% - 80%.

16. The double-sided projection screen according to claim 14, characterized in that, The process for forming the fixing adhesive layer (5) is at least one of a lamination process and a back glue process.

17. The double-sided projection screen according to claim 16, characterized in that, The film in the lamination process is any one of an EVA film and a PVB film; the equipment in the lamination process is any one of a lamination furnace, a laminator, and an autoclave.

18. A double-sided projection system, characterized in that, The double-sided projection system includes a projector and a double-sided projection screen (01), and the double-sided projection screen (01) is the double-sided projection screen (01) described in any one of claims 1 - 17.

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