Projection glass

Abstract

The present application provides a projection glass. The projection glass comprises a transparent substrate, a scattering layer located on the transparent substrate, and a transparent cover plate located on the side of the scattering layer away from the transparent substrate. The scattering layer comprises a dielectric material and a plurality of micro-nano particles dispersed in the dielectric material, and the micro-nano particles comprise at least one of photonic crystal particles, particles with a core-shell structure, or disordered dielectric particles with multiple scattering. The scattering layer of the projection glass provided by the present application has a high scattering intensity and reflection intensity for light, which can effectively improve the image quality projected onto the projection glass, and help improve the user experience.

Description

Technical Field

[0001] The present application relates to the field of imaging technology, and in particular to a projection glass. Background Art

[0002] Compared with traditional projection screens, projection glass can not only display the color images projected by the projector, but also has high transparency and can realize the integration of projection information with external information. It can be used in shopping mall window display equipment, head-up display equipment, augmented reality equipment, transparent projection display equipment and other scenarios.

[0003] At present, the existing projection glass is mainly formed by attaching a projection film on the glass. The projection film is usually a semi-transparent and semi-reflective film or a thin film with a certain scattering intensity. The projection imaging effect is poor and the projection pattern is not clear enough. Summary of the invention

[0004] The embodiment of the present application provides a projection glass. The projection glass comprises:

[0005] Transparent substrate;

[0006] a scattering layer located on the transparent substrate, the scattering layer comprising a dielectric material and a plurality of micro-nano particles dispersed in the dielectric material, the micro-nano particles comprising at least one of photonic crystal particles, particles with a core-shell structure, or disordered dielectric particles with multiple scattering;

[0007] A transparent cover plate is located on a side of the scattering layer away from the transparent substrate.

[0008] In one embodiment, the micro-nano particles in the scattering layer are all photonic crystal particles, and the mass fraction of the micro-nano particles in the scattering layer is in the range of 0.5% to 2%.

[0009] In one embodiment, the photonic crystal particle is an opal structure, and the photonic crystal particle includes a plurality of periodically arranged microsphere structures and a scattering medium dispersed between adjacent microsphere structures; the material of each microsphere structure of the photonic crystal particle is the same; or, the photonic crystal particle includes a plurality of regions, and the materials of the microsphere structures in adjacent regions are different; or, the photonic crystal particle includes a core structure and a shell structure covering the core structure, and the material of the microsphere structure included in the core structure is the same as or different from the material of the microsphere structure included in the core structure;

[0010] Alternatively, the photonic crystal particles have an inverse opal structure.

[0011] In one embodiment, the dielectric material is the same as the material of the scattering medium.

[0012] In one embodiment, the photonic crystal particles are in an opal structure, and the size of the microsphere structure ranges from 50 nm to 1000 nm.

[0013] In one embodiment, the photonic crystal particles are spherical;

[0014] The diameter of the photonic crystal particles ranges from 2 μm to 10 μm.

[0015] In one embodiment, the micro-nano particles in the scattering layer are all photonic crystal particles, and the photonic crystal particles include photonic crystal particles reflecting red light, photonic crystal particles reflecting green light, and photonic crystal particles reflecting blue light.

[0016] In one embodiment, the micro-nano particles in the scattering layer are particles with a core-shell structure, the particles with a core-shell structure include a core structure and a shell structure covering the core structure, and the material of the core structure is different from that of the shell structure; the mass fraction of the micro-nano particles in the scattering layer is in the range of 0.5% to 2%;

[0017] The medium material is a transparent material.

[0018] In one embodiment, the size of the core-shell structured particles ranges from 50 nm to 1000 nm.

[0019] In one embodiment, the micro-nano particles in the scattering layer are all disordered medium particles with multiple scattering, and the mass fraction of the micro-nano particles in the scattering layer is in the range of 0.5% to 2%;

[0020] The medium material is a transparent material;

[0021] And / or, the disordered medium particles with multiple scattering include nanowires, nanorods, disordered porous structures or liquid crystal molecular materials.

[0022] The main technical effects achieved by the embodiments of the present application are:

[0023] In the projection glass provided in the embodiment of the present application, the micro-nano particles in the scattering layer include at least one of photonic crystal particles, particles with a core-shell structure, or disordered medium particles with multiple scattering. The light incident on the projection glass interacts strongly with the photonic crystal particles, the particles with a core-shell structure, and the disordered medium particles with multiple scattering, so that the scattering intensity and reflection intensity of the scattering layer to the light are relatively high, which can effectively improve the image quality projected onto the projection glass and help to improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a cross-sectional view of a projection glass provided by an exemplary embodiment of the present application;

[0025] Figure 2 is a schematic diagram of an application scenario of projection glass provided by an exemplary embodiment of the present application;

[0026] Figure 3 is a schematic diagram of another application scenario of the projection glass provided by an exemplary embodiment of the present application;

[0027] Figure 4 is a schematic diagram of light emitted by a projector provided by an exemplary embodiment of the present application when it is incident on a projection glass;

[0028] Figure 5 is a cross-sectional view of a photonic crystal particle provided by an exemplary embodiment of the present application;

[0029] Figure 6 is a cross-sectional view of a photonic crystal particle provided by another exemplary embodiment of the present application;

[0030] Figure 7 is a cross-sectional view of a photonic crystal particle provided by yet another exemplary embodiment of the present application;

[0031] Figure 8 is a cross-sectional view of a photonic crystal particle provided by another exemplary embodiment of the present application;

[0032] Fig. 9 is a cross-sectional view of a particle with a core-shell structure provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0033] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0034] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0035] It should be understood that although the terms first, second, third, etc. may be used in the present application to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0036] The projection glass in the embodiment of the present application is described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features in the following embodiments can complement or be combined with each other.

[0037] The present application embodiment provides a projection glass. Figure 1 The projection glass 100 includes a transparent substrate 10 , a scattering layer 20 and a transparent cover plate 30 .

[0038] The scattering layer 20 is located on the transparent substrate 10, and the scattering layer 20 includes a dielectric material 21 and a plurality of micro-nano particles 22 dispersed in the dielectric material 21, and the micro-nano particles 22 include at least one of photonic crystal particles, particles with a core-shell structure, or disordered dielectric particles with multiple scattering. The transparent cover plate 30 is located on the side of the scattering layer 20 away from the transparent substrate 10.

[0039] In the projection glass provided in the embodiment of the present application, the micro-nano particles 22 in the scattering layer 20 include at least one of photonic crystal particles, particles with a core-shell structure, or disordered medium particles with multiple scattering. The light incident on the projection glass interacts strongly with the photonic crystal particles, the particles with a core-shell structure, and the disordered medium particles with multiple scattering, so that the scattering intensity and reflection intensity of the light by the scattering layer 20 are relatively high, which can effectively improve the image quality projected onto the projection glass and help improve the user experience.

[0040] In one embodiment, the transparent substrate 10 and the transparent cover plate 30 are made of materials with high light transmittance. The materials of the transparent substrate 10 and the transparent cover plate 30 can be colorless glass, which has high light transmittance and loses less light when the incident light passes through. When using projection glass, the transparent substrate 10 and the transparent cover plate 30 can both serve as the observation side of the projection glass.

[0041] Photonic crystals are micro-nano optical materials formed by periodically arranging two or more materials with different refractive indices. The ordered structure of periodic arrangement makes photonic crystals have many unique optical properties, among which the photonic band gap property is the most prominent. The photonic band gap is caused by the Bragg diffraction of the periodic structure, which means that when light waves in a certain frequency range pass through the photonic crystal, they cannot propagate in any direction inside the photonic crystal particles, that is, the photonic crystal particles have a strong reflective effect on the light in this frequency range; at the same time, light waves outside this frequency range can pass through the photonic crystal particles basically without interference, showing that the photonic crystal particles have a high transmittance to light waves outside this frequency range. By adjusting the lattice parameters of the photonic crystal particles and the materials of the photonic crystal particles, the position of the photonic band gap can be changed, that is, the position of the reflection peak of the photonic crystal particles can be changed.

[0042] It can be seen that when the micro-nano particles 22 in the scattering layer 20 are photonic crystal particles, the photonic crystal particles have photonic band gap characteristics, and the reflection and scattering intensity of the photonic crystal particles to the light in a specific frequency range is high; the transmittance of the photonic crystal particles to the light in other bands outside the specific frequency range is very high. Therefore, the reflection and scattering intensity of the scattering layer 20 to the light is high, and the transmittance of the scattering layer 20 is also high, so that the projection glass has both good display effect and high transparency, improving the problem that the existing projection glass cannot take into account both display effect and transparency at the same time. The projection glass can be used in shopping mall window display equipment, head-up display equipment, augmented reality equipment, and transparent projection display equipment.

[0043] See also Figure 2 When the projection glass 100 is used in a transparent projection display device, the projector 41 projects a projection image onto the projection glass 100. When the projection light enters the scattering layer 20, the light reflected and scattered by the photonic crystal particles enters the human eye 42 together, and the human eye can see the projection image displayed by the projection glass. At the same time, the light reflected by the surrounding environment 43 passes through the projection glass 100 and enters the human eye 42, and the human eye can see the surrounding environment at the same time.

[0044] See also Figure 3 When the projection glass 100 is used in a head-up display, the projector 51 projects a projection image onto the projection glass 100. When the projection light enters the scattering layer 20, the light reflected and scattered by the photonic crystal particles enters the human eye 52 together, and the human eye can see the projection image displayed by the projection glass. At the same time, the light reflected by the road 53 passes through the projection glass 100 and enters the human eye 52, and the human eye 52 can see the road 53 at the same time.

[0045] In one embodiment, the micro-nano particles 22 in the scattering layer 20 are all photonic crystal particles, and the photonic crystal particles include photonic crystal particles that reflect red light, photonic crystal particles that reflect green light, and photonic crystal particles that reflect blue light. In this way, the scattering layer 20 can reflect red, green, and blue light, and the three colors of light can be mixed into light of any color, so that after the image is projected onto the projection glass, the projection glass can display a color image. Figure 4 The light emitted by the projector 80 is incident on the scattering layer 20 of the projection glass. When it is incident on the photonic crystal particles 221 reflecting red, the red light R is reflected, and the blue light B and the green light G are transmitted; when it is incident on the photonic crystal particles 222 reflecting green, the green light G is reflected, and the red light R and the blue light B are transmitted; when it is incident on the photonic crystal particles 223 reflecting blue, the blue light B is reflected, and the green light G and the red light R are transmitted.

[0046] In some embodiments, a photonic crystal particle reflects light of one color, and the scattering layer includes three different photonic crystal particles, which respectively reflect red light, green light, and blue light. In other embodiments, a photonic crystal particle can reflect light of two or three colors. When the same photonic crystal particle reflects light of two colors, for example, the same photonic crystal particle can reflect red light and blue light, green light and blue light, or red light and green light. When the same photonic crystal particle reflects light of three colors, the photonic crystal particle can reflect red light, green light, and blue light.

[0047] In one embodiment, the micro-nano particles 22 in the scattering layer 20 are all photonic crystal particles, and the mass fraction of the micro-nano particles in the scattering layer is in the range of 0.5% to 2%. This arrangement can prevent the mass fraction of the photonic crystal particles in the scattering layer 20 from being too small, resulting in a low light transmittance of the scattering layer 20, which affects the user experience. The mass fraction of the photonic crystal particles in the scattering layer 20 is, for example, 0.5%, 1.0%, 1.5%, 2%, etc.

[0048] The photonic crystal particles include a plurality of periodically arranged microsphere structures and a scattering medium dispersed between adjacent microsphere structures. The wavelength range of light that the photonic crystal particles allow to pass through is related to the refractive index of the scattering medium, the refractive index of the microsphere structure and the structural parameters of the photonic crystal particles. The wavelength range of light that the photonic crystal particles allow to pass through can be changed by adjusting the refractive index of the scattering medium, the refractive index of the microsphere structure and the structural parameters of the photonic crystal particles. The material of the microsphere structure is different from that of the scattering medium.

[0049] In one embodiment, the material of the microsphere structure can be selected from polystyrene, silicon dioxide, titanium dioxide, carbon, polymethyl methacrylate, etc., and the material of the scattering medium can be selected from polystyrene, silicon dioxide, titanium dioxide, carbon, polymethyl methacrylate, etc. In this way, the materials of the microsphere structure and the scattering medium are easy to obtain.

[0050] In one embodiment, the dielectric material is the same as the material of the scattering medium. In this way, in the process of preparing photonic crystal particles, the microsphere structure can be periodically arranged and assembled and then placed in the dielectric material, and the dielectric material will enter the gap between the microsphere structures to form photonic crystal particles. In this way, it helps to simplify the preparation process of photonic crystal particles. In other embodiments, the dielectric material and the scattering medium may be different. In the process of preparing photonic crystal particles, the microsphere structure is periodically arranged and then the scattering medium is filled into the gap between the microsphere structures and cured to form photonic crystal particles. In this embodiment, the dielectric material can be a material with high light transmittance, which helps to improve the light transmittance of the projection glass.

[0051] In one embodiment, the size of the microsphere structure is in the range of 50nm to 1000nm. By setting the size of the microsphere structure within this numerical range and adjusting the material of the microsphere structure, the material of the scattering medium and the structural parameters of the photonic crystal particles, the photonic crystal particles can reflect red, green and blue light.

[0052] In one embodiment, the photonic crystal particles are spherical. Spherical photonic crystal particles have rotational symmetry, do not have the viewing angle dependence problem of the photonic band gap, have the property of wide viewing angle, and the effect of users watching the projection glass from different viewing angles is relatively consistent, which helps to improve the user experience. In other embodiments, the photonic crystal particles can be other shapes, such as elliptical, spindle-shaped, shuttle-shaped, cylindrical, hemispherical, thin sheet, etc.

[0053] In some embodiments, when the photonic crystal particles are spherical, the diameter of the photonic crystal particles ranges from 2 μm to 10 μm. This arrangement can avoid the photonic crystal particles being too large, which results in a weak photonic band gap property of the photonic crystal particles, and a reduction in the reflection and scattering intensity of the photonic crystal particles to light, which is not conducive to improving the display effect of the projection glass; and can also avoid the photonic crystal particles being too small, which results in single-color spots visible to the naked eye on the screen displayed by the projection glass, which affects the display effect.

[0054] In one embodiment, the photonic crystal particle has an opal structure, and the photonic crystal particle includes a plurality of microsphere structures and a scattering medium filled in the gaps between adjacent microsphere structures. The plurality of microsphere structures can be assembled in a close-packed face-centered cubic structure or a non-close-packed body-centered cubic structure.

[0055] In one embodiment, the photonic crystal particles are in an opal structure, and the materials of the microsphere structures in the photonic crystal particles are the same, that is, the photonic crystal particles are composed of a single type of microsphere structure. Figure 5 The photonic crystal particle 60 includes a plurality of microsphere structures 61 and a scattering medium 62 filled in the gaps between adjacent microsphere structures 61. The sizes and materials of the plurality of microsphere structures 61 are the same. The photonic crystal particle reflects light of a single color.

[0056] The photonic bandgap characteristics of photonic crystal particles are generated by Bragg diffraction of microscopic ordered periodic structures. The central wavelength position of the photonic bandgap can be calculated by the Bragg equation, which is shown in the following expression (1):

[0057]

[0058] Among them, λ max The central wavelength of the diffraction peak representing the photonic band gap; D (111) It represents the lattice distance between faces in the face-centered cubic structure, and its value is approximately equal to 0.816 times the size of the microsphere structure; θ is the incident angle of light. Taking spherical particles as an example, the incident angle θ is 90°.

[0059] n eff is the average refractive index of the photonic crystal particles, and its calculation formula is shown in the following expression (2):

[0060] n eff 2 =f1n1 2 +(1-f1)n2 2 (2)

[0061] Among them, n1 is the refractive index of the microsphere structure, f1 is the volume fraction of the microsphere structure in the lattice, and its value is approximately equal to 0.74, and n2 is the refractive index of the scattering medium. The scattering medium usually uses polymers such as polyvinyl acetal fiber (refractive index is 1.488), polyurethane, and ethylene-vinyl acetate copolymer (refractive index is 1.480).

[0062] When the material of the microsphere structure is silicon dioxide (refractive index is 1.6), the material of the scattering medium is polyvinyl acetal fiber (refractive index is 1.488), and the photonic crystal particles are spherical particles, according to formula (1) and formula (2), it can be calculated that the photonic band gap of the photonic crystal particles is located in the red light band (λ max When the diameter of the microsphere structure of the photonic crystal particle is 239.78nm, the photonic band gap is located in the green light band (λ maxThe diameter of the microsphere structure of the photonic crystal particle is 206.64nm; the photonic band gap is located in the blue light band (λ max is 460nm), and the diameter of the microsphere structure of the photonic crystal particles is 179.35nm.

[0063] In addition, when the microsphere structure is arranged in a non-close-packed manner such as body-centered cubic to form a photonic crystal particle, the position of the central wavelength of its photonic band gap can still be calculated by formula (1) and formula (2), and will not be repeated here.

[0064] In another embodiment, the photonic crystal particle has an opal structure, and the photonic crystal particle includes multiple regions, the microsphere structures in adjacent regions are made of different materials, and the photonic crystal particle includes at least two microsphere structures of different materials. Figure 6 , the photonic crystal particle 60 includes a plurality of microsphere structures 61 and a scattering medium 65 filled in the gaps between adjacent microsphere structures 63, 64, and the sizes of the microsphere structures 63, 64 of the photonic crystal particle 60 can be the same. The photonic crystal particle 60 includes four regions, two adjacent regions, and the materials of the microsphere particles 63 in one region are different from those of the microsphere structures 64 in another region. The photonic crystal particle 60 can reflect two colors of light. In other embodiments, the photonic crystal particle may include microsphere structures of three different materials.

[0065] In yet another embodiment, the photonic crystal particles have an opal structure, see Figure 7 The photonic crystal particle 60 includes a core structure 601 and a shell structure 602 covering the core structure 601. The material of the microsphere structure 67 included in the core structure 601 is different from the material of the microsphere structure 66 included in the shell structure 602, that is, the refractive index of the material of the microsphere structure 66 is different from that of the material of the microsphere structure 67. The photonic crystal particle 60 also includes a scattering medium 68 filled in the gap between adjacent microsphere structures.

[0066] In yet another embodiment, see Figure 8 The photonic crystal particle has an inverse opal structure. The photonic crystal particle 60 includes a main material 691. The main material 691 is provided with a plurality of spaced-apart pore structures, and the pore structures are filled with a scattering medium 692.

[0067] When the material of the microsphere structure is silicon dioxide (refractive index 1.6) and the material of the scattering medium is polyvinyl acetal fiber (refractive index 1.488), the experiment shows that the photonic band gap of the photonic crystal particles is located in the red light band (λ max The diameter of the pore structure of the photonic crystal particle is about 265nm; the photonic band gap of the photonic crystal particle is located in the green light band (λ maxThe diameter of the pore structure of the photonic crystal particle is about 220nm; the photonic band gap of the photonic crystal particle is located in the blue light band (λ max The diameter of the pore structure of the photonic crystal particle is about 180nm.

[0068] In one embodiment, when the photonic crystal particles are in an opal structure, the preparation of the photonic crystal particles includes the following process:

[0069] First, a microsphere structure is prepared. The microsphere structure can be prepared by a seed growth method, a physical processing method, etc. The material of the microsphere structure can be a polymer such as polystyrene, silicon dioxide, etc.

[0070] Subsequently, the microsphere structure is assembled in a periodic arrangement. The microsphere structure can be assembled by a physical method or a chemical method. The physical method can be a mechanical processing method, and the chemical method can be a microfluidics method, a microemulsion method, or an electrospray method.

[0071] Subsequently, the gaps between adjacent microspheres may be filled with a scattering medium, or the microsphere structure may be placed in a dielectric material that is the same as the scattering medium, and the dielectric material enters the gaps between adjacent microspheres and is cured.

[0072] In one embodiment, when the photonic crystal particles are in an inverse opal structure, the preparation of the photonic crystal particles includes the following process:

[0073] First, the opal-structured photonic crystal is used as a template, and the gaps between the microspheres of the opal-structured photonic crystal are not filled with materials, and the gaps between the microspheres are filled with materials such as oxides, semiconductors, and carbon. The gaps between the microspheres can be filled with materials by using a sol-gel method, a liquid phase deposition method, a spray drying method, and the like.

[0074] Subsequently, the microsphere structure of the photonic crystal template can be removed by chemical method or physical method. The chemical method can be an acid corrosion method, and the physical method can be a high-temperature combustion method.

[0075] In one embodiment, the micro-nano particles in the scattering layer are particles with a core-shell structure. Fig. 9The core-shell particles 70 include a core structure 71 and a shell structure 72 covering the core structure 71. The material of the core structure 71 is different from that of the shell structure 72. The mass fraction of the micro-nano particles 22 in the scattering layer 20 is in the range of 0.5% to 2%. The core structure 71 and the outer core structure 72 of the core-shell particles form an interface, which helps to enhance the reflection and scattering effect of the incident light. By setting the mass fraction of the micro-nano particles 22 in the scattering layer 20 to be in the range of 0.5% to 2%, it can be avoided that the mass fraction of the micro-nano particles 22 is too small, resulting in poor reflection and scattering effect of the scattering layer 20 on light, and the mass fraction of the micro-nano particles 22 in the scattering layer 20 is too large, resulting in low transparency of the projection glass, affecting the application effect of the projection glass in the fields of transparent projection display and head-up display. The mass fraction of the micro-nano particles 22 in the scattering layer 20 is, for example, 0.5%, 1.0%, 1.5%, 2%, etc.

[0076] In one embodiment, the micro-nano particles in the scattering layer are particles with a core-shell structure, and the dielectric material is a transparent material. Transparent material refers to a material with a high light transmittance, for example, a light transmittance greater than 70%. By setting the dielectric material to a transparent material, the transparency of the projection glass can be improved. In addition, the micro-nano particles are particles with a core-shell structure, and their scattering and reflection intensity of light is relatively large. Under the premise that the scattering and reflection intensity of the projection glass is certain, the mass fraction of the micro-nano particles can be set to be relatively small, and the volume of the dielectric material in the scattering layer 20 is relatively large, which helps to improve the transparency of the projection glass.

[0077] In one embodiment, the micro-nano particles in the scattering layer are particles with a core-shell structure, the material of the core structure is silicon dioxide or other materials, and the shell structure is a metal thin layer structure such as metal gold. The shell structure will produce a plasmon effect, which can enhance the effect of the micro-nano particles on incident light and enhance the scattering and reflection intensity of light.

[0078] In one embodiment, the micro-nano particles in the scattering layer are particles with a core-shell structure, and the size of the particles with a core-shell structure ranges from 50nm to 1000nm. In this way, the micro-nano particles can reflect and scatter red light, green light and blue light.

[0079] In one embodiment, the micro-nano particles 22 in the scattering layer 20 are all disordered medium particles with multiple scattering, and the mass fraction of the micro-nano particles in the scattering layer is in the range of 0.5% to 2%. The disordered medium particles with multiple scattering have a high degree of scattering of external incident light, which can effectively enhance the reflection and scattering effect of the micro-nano particles 22 on the incident light. By setting the mass fraction of the micro-nano particles 22 in the scattering layer 20 to be in the range of 0.5% to 2%, it can be avoided that the mass fraction of the micro-nano particles 22 is too small, resulting in poor reflection and scattering effect of the scattering layer 20 on light, and the mass fraction of the micro-nano particles 22 in the scattering layer 20 is too large, resulting in low transparency of the projection glass, affecting the application effect of the projection glass in the fields of transparent projection display and head-up display. The mass fraction of the micro-nano particles 22 in the scattering layer 20 is, for example, 0.5%, 1.0%, 1.5%, 2%, etc.

[0080] In one embodiment, the disordered medium particles with multiple scattering include nanowires, nanorods, disordered porous structures or liquid crystal molecular materials. The nanowires and nanorods are randomly arranged in the medium material, and the liquid crystal molecular materials are randomly arranged.

[0081] In one embodiment, the micro-nano particles in the scattering layer are disordered dielectric particles with multiple scattering, and the dielectric material is a transparent material. Transparent material refers to a material with a high light transmittance, for example, a light transmittance greater than 70% or 80%. By setting the dielectric material to a transparent material, the transparency of the projection glass can be improved. The disordered dielectric particles with multiple scattering have a greater scattering and reflection intensity for light. Under the premise that the scattering and reflection intensity of the projection glass is certain, the mass fraction of the micro-nano particles can be set to be smaller, and the mass fraction of the dielectric material in the scattering layer 20 is relatively large, which helps to improve the transparency of the projection glass.

[0082] It should be noted that in the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. It is also understood that when an element or layer is referred to as being "on" another element or layer, it may be directly on the other element, or there may be an intermediate layer. In addition, it is understood that when an element or layer is referred to as being "under" another element or layer, it may be directly under the other element, or there may be more than one intermediate layer or element. In addition, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it may be the only layer between the two layers or two elements, or there may also be more than one intermediate layer or element. Similar reference numerals throughout the text indicate similar elements.

[0083] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the disclosure disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0084] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A projection glass, characterized in that: The projection glass comprises: Transparent substrate; A scattering layer located on the transparent substrate, the scattering layer comprising a dielectric material and a plurality of micro-nano particles dispersed in the dielectric material, the micro-nano particles comprising photonic crystal particles, particles with a core-shell structure or disordered dielectric particles with multiple scattering; a transparent cover plate located on a side of the scattering layer away from the transparent substrate; When using projection glass, both the transparent substrate and the transparent cover plate can serve as the viewing side of the projection glass; The micro-nano particles in the scattering layer are all photonic crystal particles, and the mass fraction of the micro-nano particles in the scattering layer is in the range of 0.5% to 2%; the photonic crystal particles are in an opal structure, and the photonic crystal particles include a plurality of periodically arranged microsphere structures and scattering media dispersed between adjacent microsphere structures; The photonic crystal particle comprises a plurality of regions, and the materials of the microsphere structures in adjacent regions are different; Alternatively, the photonic crystal particle includes a core structure and a shell structure covering the core structure, and the material of the microsphere structure included in the core structure is different from the material of the microsphere structure included in the shell structure.

2. The projection glass according to claim 1, characterized in that: The material of the dielectric medium is the same as that of the scattering medium.

3. The projection glass according to claim 1, characterized in that: The photonic crystal particles are in an opal structure, and the size of the microsphere structure ranges from 50nm to 1000nm.

4. The projection glass according to claim 1, characterized in that: The photonic crystal particles are spherical; The diameter of the photonic crystal particles ranges from 2 μm to 10 μm.

5. The projection glass according to claim 1, characterized in that: The micro-nano particles in the scattering layer are all photonic crystal particles, and the photonic crystal particles include photonic crystal particles that reflect red light, photonic crystal particles that reflect green light, and photonic crystal particles that reflect blue light.

6. The projection glass according to claim 1, characterized in that: The disordered medium particles with multiple scattering include nanowires, nanorods, disordered porous structures or liquid crystal molecular materials.

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