CN114815488A - Projection glass - Google Patents
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- CN114815488A CN114815488A CN202110071203.XA CN202110071203A CN114815488A CN 114815488 A CN114815488 A CN 114815488A CN 202110071203 A CN202110071203 A CN 202110071203A CN 114815488 A CN114815488 A CN 114815488A
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- 239000011521 glass Substances 0.000 title claims abstract description 66
- 239000002245 particle Substances 0.000 claims abstract description 165
- 239000004038 photonic crystal Substances 0.000 claims abstract description 139
- 239000002105 nanoparticle Substances 0.000 claims abstract description 51
- 239000011258 core-shell material Substances 0.000 claims abstract description 19
- 239000000758 substrate Substances 0.000 claims abstract description 15
- 239000003989 dielectric material Substances 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 68
- 239000004005 microsphere Substances 0.000 claims description 68
- 239000012780 transparent material Substances 0.000 claims description 10
- 239000004973 liquid crystal related substance Substances 0.000 claims description 4
- 239000002073 nanorod Substances 0.000 claims description 4
- 239000002070 nanowire Substances 0.000 claims description 4
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
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Images
Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
- G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Optics & Photonics (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
The application provides a projection glass. The projection glass comprises a transparent substrate, a scattering layer positioned on the transparent substrate and a transparent cover plate positioned on one side of the scattering layer, which is far away from the transparent substrate. The scattering layer comprises a dielectric material and a plurality of micro-nano particles dispersed in the dielectric material, wherein 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 application provides a scattering intensity and the reflection intensity of projection glass's scattering layer to light are higher, can effectively promote the image quality of projection on the projection glass, help promoting user's use and experience.
Description
Technical Field
The application relates to the technical field of imaging, in particular to projection glass.
Background
Compared with the traditional projection curtain, the projection glass can display the color image projected by the projector, has high transparency, can realize the fusion of projection information and external information, and can be applied to scenes such as shop window display equipment, head-up display equipment, augmented reality equipment, transparent projection display equipment and the like.
At present, the existing projection glass is mainly formed by attaching a projection film on glass, the projection film is usually a semi-transparent and semi-reflective film or a film with certain scattering intensity, the projection imaging effect is poor, and the projection pattern is not clear enough.
Disclosure of Invention
The embodiment of the application provides projection glass. The projection glass includes:
a transparent substrate;
the scattering layer is positioned on the transparent substrate and 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;
and the transparent cover plate is positioned on one side of the scattering layer, which is far away from the transparent substrate.
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 a range of 0.5% -2%.
In one embodiment, the photonic crystal particles are in an opal structure, and comprise a plurality of microsphere structures which are periodically arranged and scattering media which are dispersed between the adjacent microsphere structures; the materials of all the microsphere structures of the photonic crystal particles are the same; or, the photonic crystal particle comprises a plurality of regions, and the materials of the microsphere structures in the adjacent regions are different; or, the photonic crystal particle comprises a core structure and a shell structure coating the core structure, and the material of the microsphere structure comprised by the core structure is the same as or different from the material of the microsphere structure comprised by the core structure;
or the photonic crystal particles are in an inverse opal structure.
In one embodiment, the medium material is the same as the material of the scattering medium.
In one embodiment, the photonic crystal particles are opal structures, and the microsphere structures have a size ranging from 50nm to 1000 nm.
In one embodiment, the photonic crystal particles are spherical;
the diameter range of the photonic crystal particles is 2-10 mu m.
In one embodiment, the micro-nano particles in the scattering layer are all photonic crystal particles, and the photonic crystal particles comprise photonic crystal particles reflecting red light, photonic crystal particles reflecting green light and photonic crystal particles reflecting blue light.
In one embodiment, the micro-nano particles in the scattering layer are particles with a core-shell structure, the particles with the core-shell structure comprise a core structure and a shell structure coating 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 ranges from 0.5% to 2%;
the medium material is a transparent material.
In one embodiment, the size of the particles having a core-shell structure ranges from 50nm to 1000 nm.
In one embodiment, the micro-nano particles in the scattering layer are disordered medium particles with multiple scattering, and the mass fraction of the micro-nano particles in the scattering layer is in a range of 0.5% -2%;
the medium material is a transparent material;
and/or the disordered medium particles with multiple scattering comprise nanowires, nanorods, disordered porous structures or liquid crystal molecular materials.
The embodiment of the application achieves the main technical effects that:
the projection glass that this application embodiment provided, the micro-nano particle in the scattering layer includes photonic crystal particle, the granule that has the nucleocapsid structure or have multiple scattering at least one in the unordered medium granule, the light and the photonic crystal granule of incident to projection glass, the granule that has the nucleocapsid structure and the unordered medium granule that has multiple scattering interact stronger for the scattering intensity and the reflection intensity of scattering layer to the light are higher, can effectively promote the image quality of projection on the projection glass, help promoting user's use and experience.
Drawings
FIG. 1 is a cross-sectional view of a projection glass provided in an exemplary embodiment of the present application;
FIG. 2 is a schematic view of an application scenario of a projection glass provided in an exemplary embodiment of the present application;
FIG. 3 is a schematic view of another application scenario of a projection glass provided in an exemplary embodiment of the present application;
FIG. 4 is a schematic view of a projector according to an exemplary embodiment of the present disclosure when light is incident on a projection glass;
FIG. 5 is a cross-sectional view of a photonic crystal particle provided in an exemplary embodiment of the present application;
FIG. 6 is a cross-sectional view of a photonic crystal particle provided by another exemplary embodiment of the present application;
FIG. 7 is a cross-sectional view of a photonic crystal particle provided by yet another exemplary embodiment of the present application;
FIG. 8 is a cross-sectional view of a photonic crystal particle provided in accordance with yet another exemplary embodiment of the present application;
fig. 9 is a cross-sectional view of a particle having a core-shell structure provided in an exemplary embodiment of the present application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
The projection glass in the embodiments of the present application will be described in detail below with reference to the accompanying drawings. Features in the embodiments described below may complement or be combined with each other without conflict.
The embodiment of the application provides projection glass. Referring to fig. 1, the projection glass 100 includes a transparent substrate 10, a diffusion layer 20, and a transparent cover plate 30.
The scattering layer 20 is located on the transparent substrate 10, the scattering layer 20 includes a medium material 21 and a plurality of micro-nano particles 22 dispersed in the medium material 21, and the micro-nano particles 22 include at least one of photonic crystal particles, particles with a core-shell structure, or disordered medium particles with multiple scattering. A transparent cover plate 30 is located on the side of the scattering layer 20 facing away from the transparent substrate 10.
The projection glass provided by the embodiment of the application, the little nano particle 22 in the scattering layer 20 includes at least one of photonic crystal particle, granule that has the nucleocapsid structure or the unordered medium granule that has multiple scattering, the light and the photonic crystal particle of incidenting to projection glass, the interaction of the granule that has the nucleocapsid structure and the unordered medium granule that has multiple scattering is stronger, make scattering layer 20 to the scattering intensity and the reflection intensity of light higher, can effectively promote the image quality of projection on the projection glass, help promoting user's use experience.
In one embodiment, the transparent substrate 10 and the transparent cover 30 are made of materials with high light transmittance. The transparent substrate 10 and the transparent cover 30 may be made of colorless glass, which has high transmittance and less loss of incident light. When a projection glass is used, both the transparent substrate 10 and the transparent cover 30 can be used as the viewing side of the projection glass.
The photonic crystal is a micro-nano optical material formed by periodically arranging two or more materials with different refractive indexes. The periodic arrangement of the ordered structure gives photonic crystals a number of unique optical properties, most notably photonic band gap properties. The photonic band gap is caused by Bragg diffraction of a periodic structure, and represents that when light waves in a certain wave frequency range pass through the photonic crystal, the light waves cannot be transmitted in any direction in the photonic crystal particles, namely the photonic crystal particles have strong reflection effect on the light in the frequency range; meanwhile, the light waves outside the frequency range can basically pass through the photonic crystal particles without interference, and the transmittance of the photonic crystal particles to the light waves outside the frequency range is high. The position of the photonic band gap, namely the position of the reflection peak of the photonic crystal particle can be changed by adjusting the lattice parameter of the photonic crystal particle and the material of the photonic crystal particle.
It can be known 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 light rays in a specific frequency range is high; the photonic crystal particles have high transmittance for light in other wavelength bands outside the specific frequency range. Therefore, the scattering layer 20 has high reflection and scattering intensity to light, and the light transmittance of the scattering layer 20 is also high, so that the projection glass has a good display effect and high transparency at the same time, and the problem that the display effect and the transparency cannot be considered at the same time in the conventional projection glass is solved. The projection glass can be used in shop window display equipment, head-up display equipment, augmented reality equipment and transparent projection display equipment.
Referring to fig. 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, and when projection light is incident on the diffusion layer 20, the light reflected and diffused 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. Meanwhile, the light reflected by the surrounding environment 43 passes through the projection glass 100 and enters the human eyes 42, and the human eyes can see the surrounding environment at the same time.
Referring to fig. 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, and when the projection light is incident on the diffusion layer 20, the light reflected and diffused by the photonic crystal particles enters the human eye 52, and the human eye can see the projection image displayed by the projection glass. Meanwhile, the emitted light reflected by the traffic road 53 passes through the projection glass 100 and enters the human eyes 52, and the human eyes 52 can see the traffic road 53 at the same time.
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 reflecting red light, photonic crystal particles reflecting green light, and photonic crystal particles reflecting blue light. Thus, the scattering layer 20 can reflect red, green and blue light, and the light of the three colors can be mixed into light of any color, so that the projection glass can display a color image after the image is projected onto the projection glass. Referring to fig. 4, when light emitted from the projector 80 is incident on the diffusion layer 20 of the projection glass and is incident on the red-reflecting photonic crystal particles 221, the red light R is reflected, and the blue light B and the green light G are transmitted; when the light enters the green-reflective photonic crystal particles 222, the green light G is reflected, and the red light R and the blue light B are transmitted; when incident on the blue-reflective photonic crystal particles 223, the blue light B is reflected, and the green light G and the red light R are transmitted.
In some embodiments, one photonic crystal particle reflects light of one color, and the scattering layer includes three different photonic crystal particles that respectively reflect light of red, light of green, and light of blue. In other embodiments, one photonic crystal particle may reflect two or three colors of light. When the same photonic crystal particle reflects light of two colors, for example, the same photonic crystal particle may reflect red light and blue light, green light and blue light, and 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.
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 a range of 0.5% to 2%. With the arrangement, the phenomenon that the light transmittance of the scattering layer 20 is low and the use experience of a user is influenced due to too small mass fraction of photonic crystal particles in the scattering layer 20 can be avoided. The mass fraction of photonic crystal particles in the scattering layer 20 is, for example, 0.5%, 1.0%, 1.5%, 2%, or the like.
The photonic crystal particles comprise a plurality of microsphere structures which are periodically arranged and scattering media which are dispersed between the adjacent microsphere structures. The wave band of light allowed to penetrate through the photonic crystal particles 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, and the wave band range of the light allowed to penetrate through the photonic crystal particles 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.
In one embodiment, the material of the microsphere structure may be selected from polystyrene, silica, titanium dioxide, carbon, polymethyl methacrylate, and the like, and the material of the scattering medium may be selected from polystyrene, silica, titanium dioxide, carbon, polymethyl methacrylate, and the like. Thus, the materials of the microsphere structure and the scattering medium are easily obtained.
In one embodiment, the medium material is the same as the material of the scattering medium. Therefore, in the process of preparing the photonic crystal particles, the microsphere structures are periodically arranged and assembled and then can be placed into the dielectric material, and the dielectric material can enter gaps among the microsphere structures to form the photonic crystal particles. Thus, the preparation process of the photonic crystal particles is simplified. In other embodiments, the dielectric material may be different from the scattering medium, and in the process of preparing the photonic crystal particles, the scattering medium is filled in gaps between the microsphere structures after the microsphere structures are periodically arranged, and then the photonic crystal particles are formed by curing. In this embodiment, the dielectric material may be a material with a high light transmittance, which is helpful for improving the light transmittance of the projection glass.
In one embodiment, the microsphere structures range in size from 50nm to 1000 nm. The size of the microsphere structure is set within the numerical range, and red, green and blue light can be reflected by the photonic crystal particles by adjusting the materials of the microsphere structure, the scattering medium and the structural parameters of the photonic crystal particles.
In one embodiment, the photonic crystal particles are spherical. The spherical photonic crystal particles have a rotational symmetry type, the problem of viewing angle dependence of photonic band gaps does not exist, the wide viewing angle property is achieved, the effect of a user watching projection glass from different viewing angles is consistent, and the user experience is promoted. In other embodiments, the photonic crystal particles may be other shapes, for example, elliptical, spindle, fusiform, cylindrical, hemispherical, lamellar, and the like.
In some embodiments, when the photonic crystal particles are spherical, the photonic crystal particles have a diameter in the range of 2 μm to 10 μm. So set up, both can avoid photonic crystal particle's size too big, lead to photonic crystal particle's photonic band gap nature weaker, photonic crystal particle reduces to the reflection and the scattering intensity of light, is unfavorable for promoting projection glass's display effect, also can avoid photonic crystal particle's size too little, leads to the picture that projection glass shows to appear the spot of the single colour of macroscopic, influences the display effect.
In one embodiment, the photonic crystal particle is of an opal structure, and the photonic crystal particle comprises a plurality of microsphere structures and a scattering medium filled in gaps between the adjacent microsphere structures. The plurality of microsphere structures may be assembled in a close-packed face-centered cubic structure or a non-close-packed body-centered cubic structure.
In one embodiment, the photonic crystal particle has an opal structure, and the material of each microsphere structure in the photonic crystal particle is the same, that is, the photonic crystal particle is composed of a single kind of microsphere structure. Referring to fig. 5, the photonic crystal particle 60 includes a plurality of microsphere structures 61 and a scattering medium 62 filled in gaps between adjacent microsphere structures 61, and sizes and materials of the plurality of microsphere structures 61 are respectively the same. The photonic crystal particles reflect a single color of light.
The photonic band gap characteristic of the photonic crystal particle is generated by Bragg diffraction of a micro-ordered periodic structure, the central wavelength position of the photonic band gap of the photonic crystal particle can be calculated by a Bragg equation, and the Bragg equation is shown in the following expression (1):
wherein λ is max A center wavelength of a diffraction peak representing a photonic band gap; d (111) Represents the lattice distance between the faces in a face centered cubic structure with a value equal to about 0.816 times the size of the microsphere structure; theta is the incident angle of the light, and in the case of spherical particles, the incident angle theta is 90 deg..
n eff Is the average refractive index of the photonic crystal particle, and the calculation formula thereof is shown in the following expression (2):
n eff 2 ＝f 1 n 1 2 +(1-f 1 )n 2 2 (2)
wherein n is 1 Is refractive of microsphere structureRate, f 1 Is the volume fraction of the microsphere structure in the lattice, with a value of about 0.74, n 2 For the refractive index of the scattering medium, polymers such as polyvinyl acetal fibers (refractive index of 1.488), polyurethane, and ethylene-vinyl acetate copolymers (refractive index of 1.480) are generally used as the scattering medium.
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, the calculation can be carried out according to the formula (1) and the formula (2): the photonic band gap of the photonic crystal particle is located in the red light band (lambda) max 615nm), the diameter of the microsphere structure of the photonic crystal particle is 239.78 nm; the photonic band gap is located in the green light band (lambda) max 530nm), the diameter of the microsphere structure of the photonic crystal particles is 206.64 nm; the photonic band gap is located in the blue light band (lambda) max Is 460nm), the diameter of the microsphere structure of the photonic crystal particles is 179.35 nm.
In addition, when the microsphere structure forms photonic crystal particles in a non-close-packed arrangement mode such as a body-centered cubic mode, the central wavelength position of the photonic band gap can still be obtained through calculation of the formula (1) and the formula (2), and the description is omitted.
In another embodiment, the photonic crystal particle is in an opal structure, the photonic crystal particle comprises a plurality of regions, the material of the microsphere structures in adjacent regions is different, and the photonic crystal particle comprises a microsphere structure of at least two different materials. Referring to fig. 6, 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 respective microsphere structures 63, 64 of photonic crystal particle 60 may be the same. Photonic crystal particle 60 includes four regions, two adjacent regions, wherein the material of microspheroidal particle 63 in one region is different from the material of microspheroidal structure 64 in the other region. The photonic crystal particles 60 may reflect two colors of light. In other embodiments, the photonic crystal particles may include a microsphere structure of three different materials.
In still another embodiment, the photonic crystal particle has an opal structure, referring to fig. 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. Photonic crystal particle 60 also includes a scattering medium 68 filled in the gaps between adjacent microsphere structures.
In yet another embodiment, referring to fig. 8, the photonic crystal particle has an inverse opal structure, and the photonic crystal particle 60 includes a main material 691, wherein the main material 691 is provided with a plurality of hole structures arranged at intervals, and the hole structures are filled with a scattering medium 692.
When the material of the microsphere structure is silicon dioxide (refractive index is 1.6) and the material of the scattering medium is polyvinyl acetal fiber (refractive index is 1.488), the following results are obtained through experiments: the photonic band gap of the photonic crystal particle is located in the red light band (lambda) max 615nm) of the photonic crystal particle, the diameter of the pore structure of the photonic crystal particle is about 265 nm; the photonic band gap of the photonic crystal particle is located in the green light band (lambda) max 530nm) the diameter of the pore structure of the photonic crystal particle is about 220 nm; the photonic band gap of the photonic crystal particle is located in the blue light band (lambda) max Is 460nm), the diameter of the pore structure of the photonic crystal particle is about 180 nm.
In one embodiment, when the photonic crystal particles are in an opal structure, the preparation of the photonic crystal particles comprises the following processes:
first, a microsphere structure is prepared. The microsphere structure can be prepared by adopting a seed growth method, a physical processing method and the like. The material of the microsphere structure can adopt polymers such as polystyrene, silicon dioxide and the like.
And then assembling the microsphere structures according to a periodic arrangement mode, wherein the microsphere structures can be assembled by adopting a physical method or a chemical method, the physical method can be a mechanical processing method, and the chemical method can be a micro-fluidic method, a micro-emulsion method or an electrospray method and the like.
Subsequently, the gap between adjacent microspheres may be filled with a scattering medium, or the microsphere structure may be placed in a dielectric material, which is the same as the scattering medium, and the dielectric material enters the gap between adjacent microspheres and is cured.
In one embodiment, when the photonic crystal particles are in an inverse opal structure, the preparation of the photonic crystal particles comprises the following processes:
firstly, the photonic crystal with the opal structure is used as a template, the gap between the microsphere structures of the photonic crystal with the opal structure is not filled with materials, and the gap between the microspheres is filled with materials such as oxide, semiconductor, carbon and the like. The material may be filled in the gaps between the microspheres by a sol-gel method, a liquid phase deposition method, a spray drying method, or the like.
And then, removing the microsphere structure of the photonic crystal template by a chemical method or a physical method, wherein the chemical method can be an acid corrosion method, and the physical method can be a high-temperature combustion method.
In an embodiment, the micro-nano particles in the scattering layer are all particles having a core-shell structure, referring to fig. 9, the particles 70 having a core-shell structure include a core structure 71 and a shell structure 72 covering the core structure 71, the core structure 71 is made of a material different from that of the shell structure 72, and the mass fraction of the micro-nano particles 22 in the scattering layer 20 is in a range of 0.5% to 2%. An interface is formed between the inner core structure 71 and the outer core structure 72 of the core-shell structure particles, which is helpful for enhancing the reflection and scattering effects of incident light. By setting the mass fraction range of the micro-nano particles 22 in the scattering layer 20 to be 0.5-2%, not only can the poor light reflection and scattering effects of the scattering layer 20 caused by too small mass fraction of the micro-nano particles 22 be avoided, but also the low transparency of the projection glass caused by too large mass fraction of the micro-nano particles 22 in the scattering layer 20 can be avoided, and the application effect of the projection glass in the fields of transparent projection display, head-up display and the like is influenced. The mass fraction of the micro-nano particles 22 in the scattering layer 20 is, for example, 0.5%, 1.0%, 1.5%, 2%, or the like.
In one embodiment, the micro-nano particles in the scattering layer are particles with a core-shell structure, and the medium material is a transparent material. The transparent material refers to a material having a high light transmittance, for example, a light transmittance of more than 70%. By arranging the medium material as the transparent material, the transparency of the projection glass can be improved. The micro-nano particles are particles with a core-shell structure, the scattering and reflection intensity of the micro-nano particles to light is high, the mass fraction of the micro-nano particles can be set to be low on the premise that the scattering and reflection intensity of the projection glass is constant, and the volume ratio of the medium material in the scattering layer 20 is high, so that the transparency of the projection glass is improved.
In one embodiment, the micro-nano particles in the scattering layer are particles with a core-shell structure, the core structure is made of materials such as silicon dioxide, and the shell structure is a metal thin layer structure such as metal gold, and the shell structure can generate a plasmon effect, so that the effect of the micro-nano particles on incident light can be enhanced, and the scattering and reflection intensity of the light can be enhanced.
In one embodiment, the micro-nano particles in the scattering layer are particles with a core-shell structure, and the size range of the particles with the core-shell structure is 50 nm-1000 nm. By the arrangement, the micro-nano particles can reflect and scatter red light, green light and blue light.
In one embodiment, the micro-nano particles 22 in the scattering layer 20 are disordered medium particles with multiple scattering, and the mass fraction of the micro-nano particles in the scattering layer is in a range of 0.5% to 2%. The disordered medium particles with multiple scattering have high scattering degree to external incident light, and can effectively enhance the reflection and scattering effects of the micro-nano particles 22 to the incident light. By setting the mass fraction of the micro-nano particles 22 in the scattering layer 20 to be 0.5-2%, not only can the poor light reflection and scattering effects of the scattering layer 20 caused by too small mass fraction of the micro-nano particles 22 be avoided, but also the low transparency of the projection glass caused by too large mass fraction of the micro-nano particles 22 in the scattering layer 20 can be avoided, and the application effects of the projection glass in the fields of transparent projection display, head-up display and the like are influenced. The mass fraction of the micro-nano particles 22 in the scattering layer 20 is, for example, 0.5%, 1.0%, 1.5%, 2%, or the like.
In one embodiment, the disordered dielectric particle having multiple scattering comprises a nanowire, nanorod, disordered porous structure, or liquid crystal molecular material. The nano-wires and the nano-rods are arranged in disorder in the medium material, and the liquid crystal molecular material is arranged randomly.
In one embodiment, the micro-nano particles in the scattering layer are disordered medium particles with multiple scattering, and the medium material is a transparent material. The transparent material refers to a material having a high light transmittance, for example, a light transmittance of more than 70% or 80%. By arranging the medium material as the transparent material, the transparency of the projection glass can be improved. The disordered medium particles with multiple scattering have high light scattering and reflection intensity, the mass fraction of the micro-nano particles can be set to be small on the premise that the scattering and reflection intensity of the projection glass is constant, and the mass fraction of the medium material in the scattering layer 20 is high, so that the transparency of the projection glass is improved.
It is noted that in the drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. Also, it will be understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element or layer or intervening layers may also be present. In addition, it will be understood that when an element or layer is referred to as being "under" another element or layer, it can be directly under the other element or intervening layers or elements may also be present. In addition, it will also be understood that when a layer or element is referred to as being "between" two layers or elements, it can be the only layer between the two layers or elements, or more than one intermediate layer or element can also be present. Like reference numerals refer to like elements throughout.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements 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 application is limited only by the appended claims.
Claims (10)
1. A projection glass, comprising:
a transparent substrate;
the scattering layer is positioned on the transparent substrate and 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;
and the transparent cover plate is positioned on one side of the scattering layer, which is far away from the transparent substrate.
2. The projection glass of claim 1, wherein 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 a range of 0.5-2%.
3. The projection glass of claim 1, wherein the photonic crystal particles are opal structures, and the photonic crystal particles comprise a plurality of periodically arranged microsphere structures and scattering media dispersed between adjacent microsphere structures; the materials of all the microsphere structures of the photonic crystal particles are the same; or, the photonic crystal particle comprises a plurality of regions, and the materials of the microsphere structures in the adjacent regions are different; or, the photonic crystal particle comprises a core structure and a shell structure coating the core structure, and the material of the microsphere structure comprised by the core structure is the same as or different from the material of the microsphere structure comprised by the core structure;
or the photonic crystal particles are in an inverse opal structure.
4. The projection glass of claim 3, wherein the medium material is the same as the material of the scattering medium.
5. The projection glass of claim 3, wherein the photonic crystal particles are opal structures and the microsphere structures have a size ranging from 50nm to 1000 nm.
6. The projection glass of claim 1, wherein the photonic crystal particles are spherical;
the diameter range of the photonic crystal particles is 2-10 mu m.
7. The projection glass of claim 1, wherein the micro-nano particles in the scattering layer are all photonic crystal particles, and the photonic crystal particles comprise photonic crystal particles reflecting red light, photonic crystal particles reflecting green light and photonic crystal particles reflecting blue light.
8. The projection glass of claim 1, wherein the micro-nano particles in the scattering layer are all particles with a core-shell structure, the particles with the core-shell structure comprise 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 ranges from 0.5% to 2%;
the medium material is a transparent material.
9. The projection glass according to claim 1, wherein the particles having a core-shell structure have a size in the range of 50nm to 1000 nm.
10. The projection glass of claim 1, wherein the micro-nano particles in the scattering layer are disordered medium particles with multiple scattering, and the mass fraction of the micro-nano particles in the scattering layer is in a range of 0.5-2%;
the medium material is a transparent material;
and/or the disordered medium particles with multiple scattering comprise nanowires, nanorods, disordered porous structures or liquid crystal molecular materials.
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| CN202110071203.XA CN114815488A (en) | 2021-01-19 | 2021-01-19 | Projection glass |
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| CN202110071203.XA CN114815488A (en) | 2021-01-19 | 2021-01-19 | Projection glass |
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