46results about How to "Improve reflection efficiency" patented technology

The invention discloses a C2 symmetric chiral metasurface and application and verification methods of phase control, and belongs to the field of micro-nano optics, the C2 symmetric chiral metasurface comprises a surface layer, a middle layer and a back plate layer which are sequentially arranged from top to bottom, the surface layer is composed of a left arc-shaped ring and a right arc-shaped ring which are arranged in a central symmetry mode, and protrusions are arranged on the opposite sides of the left arc-shaped ring and the right arc-shaped ring; the protrusions on the left arc-shaped ring and the protrusions on the right arc-shaped ring are symmetrically arranged about the circle center, and the central angle beta of the notch of the left arc-shaped ring and the central angle beta of the notch of the right arc-shaped ring are obtuse angles. By adopting the C2 symmetric chiral metasurface and the application and verification method of phase control, the spin decoupling phase control of the co-polarized circularly polarized terahertz wave can be realized only through the chiral phase by using the superatoms which have no mirror symmetry and have second-order rotation (C2) symmetry and the mirror atoms thereof.

The utility model discloses a positioning adhesive tape and a photovoltaic module, the positioning adhesive tape is used for fixing two adjacent groups of battery pieces, the positioning adhesive tape comprises two oppositely arranged positioning parts and a protruding part connecting the two positioning parts, each positioning part comprises a base material layer and a bonding layer laminated on the front surface of the base material layer, and the protruding part is connected with the two positioning parts. The front face of the protruding part comprises a plurality of light reflecting faces distributed towards the battery piece, and the light reflecting faces are configured to reflect all or part of incident light to the surface of the battery piece. According to the utility model, the structure of the positioning adhesive tape is optimally designed, so that displacement of the battery pieces can be prevented through the protruding parts, and the distance between the adjacent battery pieces is kept unchanged in the laminating process; meanwhile, incident light can be at least partially reflected to the front face of the cell through the reflective face, reflected light is increased, and the power of the front face of the cell is improved.

The invention relates to an image sensor and a preparation method thereof, and electronic equipment, the image sensor comprises a substrate, a plurality of isolation structures and a plurality of photodiodes, the isolation structures are arranged in the substrate at intervals, the photodiodes are arranged between the adjacent isolation structures, and each isolation structure comprises a first isolation layer located in the substrate; the first high-dielectric-constant dielectric layer is located on the side, away from the substrate, of the first isolation layer; the reflecting layer is located on the side, away from the first isolating layer, of the first high-dielectric-constant dielectric layer; the second high-dielectric-constant dielectric layer is located on the side, away from the first high-dielectric-constant dielectric layer, of the reflecting layer; wherein the reflecting layer and at least one of the first high-dielectric-constant dielectric layer and the second high-dielectric-constant dielectric layer have the same element. According to the image sensor, the situation that the second high-dielectric-constant dielectric layer is gathered at the bottom of the isolation structure can be avoided, the uniformity of the side wall of the isolation structure is improved, and therefore the reflection efficiency is improved.

The invention discloses an all-quartz multi-component Raman signal online detection module based on multi-laser additive and subtractive manufacturing. The all-quartz multi-component Raman signal online detection module comprises a node-free negative curvature hollow-core optical fiber with side micropores, a multimode optical fiber, a single-mode optical fiber plated with a ceramic film, a semicircular micro-channel, a quartz slurry packaging layer and a quartz fixing base, a micro-scale micropore is processed on the side surface of a node-free negative-curvature hollow fiber by utilizing picosecond laser, a multimode fiber, the node-free negative-curvature hollow fiber with the side micropore and a single-mode fiber are welded into a whole, the single-mode fiber is ground into a slice by utilizing an optical fiber grinding technology, and a ceramic membrane is deposited on the end surface of the slice single-mode fiber. Picosecond laser is used for scanning the quartz fixing base layer by layer so as to process a semicircular micro-channel for placing the sensor, and CO2 laser is used for scanning, depositing and curing the quartz slurry packaging layer layer by layer so as to package the sensor. According to the invention, the to-be-detected substance is injected into the all-quartz sensor, so that on-line detection of multi-component Raman signals can be realized in high electromagnetic interference environments such as electric power and the like.

The utility model belongs to the technical field of lighting devices, and particularly provides a golden yellow light emitting device which comprises a blue light emitting unit, a red light emitting unit and fluorescent glue, the fluorescent glue covers the blue light emitting unit and the red light emitting unit, and yellow fluorescent powder and / or red fluorescent powder are / is contained in the fluorescent glue. Blue light emitted by the blue light emitting unit can excite yellow fluorescent powder in the fluorescent glue to generate yellow light, and then the yellow light is mixed with red light emitted by the red light emitting unit to obtain golden yellow light with the color temperature ranging from 1700 K to 2500 K. Compared with a traditional white light LED lamp, the blue light component and the color temperature can be effectively reduced, and the service life of the LED lamp is prolonged. The LED lamp improves the penetrating power of light rays under severe weather conditions such as rain, fog and dust and the road surface reflection efficiency, is particularly suitable for municipal lighting such as urban road lighting and tunnel lighting, enables a driver to see pedestrians and obstacles on the road surface more easily and clearly, and improves the driving safety coefficient.

The present invention provides a low-glare value photobiological safety eye protection lamp, comprising an iron shell, a head assembly is provided at the end of the iron shell, two light source boards are provided at the inner top of the iron shell, backlight boards are provided on both sides of the light source board, the backlight boards are located in the middle of both sides of the iron shell, an anti-glare lampshade is provided on the surface of the iron shell, an anti-glare grille plate is provided on the surface of the anti-glare lampshade, and a frame is slidably connected to the outer side of the iron shell. Beneficial effect: the present invention solves the problem that the existing classroom lamps have low illumination and poor uniformity in the classroom space, which is convenient for teenagers and teachers to study and work in this environment for a long time, and the striped anti-glare lampshade made of PPS material is added, which solves the problem of illumination loss and too small beam angle caused by the current common use of acrylic frosted boards, and can effectively avoid the formation of strong light and dark intervals indoors while reducing glare.

The invention discloses a polarization multiplexing all-dielectric metasurface structure color device based on gallium phosphide. The device is composed of periodically arranged metasurface units, and each unit sequentially comprises a transparent quartz substrate 1, a TiO2 reflecting layer 2 and an all-dielectric nano resonator located on the TiO2 reflecting layer 2 from bottom to top. The nano resonator is composed of a GaP nano column 3 and a SiO2 impedance matching layer 4 covering the top of the GaP nano column 3. The material cost is low, the manufacturing process is mature, and the designed device shows obvious optical response difference under irradiation of different polarized lights. By utilizing the characteristics of high refractive index and low loss of a gallium phosphide material in a medium-long wave region of visible light, a single reflection peak of which the reflection efficiency is up to 99% and the bandwidth is less than 16nm is realized under X polarization of a visible light wave band; and a stable multi-peak spectrum is formed under Y polarization to serve as a spectrum fingerprint, so that high-quality display and polarization multiplexing functions are realized in the same device. The device is suitable for the fields of high-color-gamut display, optical anti-counterfeiting and the like.

The present invention provides a method for preparing an epitaxial wafer with a Bragg reflector, and belongs to the technical field of light-emitting diodes. After the n-type layer, active layer and p-type layer are grown on the substrate, multiple SiO2 refractive layers and Ti3O5 refractive layers are alternately evaporated to obtain a Bragg reflector. The evaporation rate of the SiO2 refractive layer is a first evaporation rate to obtain a SiO2 refractive layer with a surface roughness of 0.5 to 0.8 nm, and the evaporation rate of the Ti3O5 refractive layer is a second evaporation rate to obtain a Ti3O5 refractive layer with a surface roughness of 1.0 to 1.1 nm; the roughness is reasonable, the particles that appear at the junction of the SiO2 refractive layer and the Ti3O5 refractive layer will be reduced, and the junction of the SiO2 refractive layer and the Ti3O5 refractive layer is relatively flat and the roughness is also low. The microscopic crystal quality and interlayer quality of the obtained Bragg reflector are effectively improved to improve the reflective efficiency of the Bragg reflector.

The present invention discloses a micro display device and a preparation method thereof, which relates to the field of display technology, wherein the micro display device comprises: a driving substrate; a pixel array layer, comprising a plurality of micro display units, arranged on the surface of the driving substrate; a nano composite film, comprising a multi-layer nano-scale film layer, located in the light emitting direction of the side wall of the micro display unit; wherein the multi-layer nano-scale film layer comprises an insulating bottom layer, an intermediate transmission layer, a reflection layer and a protective layer which are sequentially away from the side wall. The technical solution provided by the present invention not only enhances the optical isolation and electrical isolation between the micro display units, but also meets the demand for preparing micro display units of smaller size.

This invention discloses a high-strength passive daytime radiation cooling film and its preparation method, belonging to the field of functional polymer materials and thermal management technology. The film has a bilayer composite structure, including an upper reflective layer and a lower emitting layer. This invention employs an integrated process of melt blending-lamination-biaxial stretching-induced phase separation-extraction pore-fixing. Through a process design of stretching followed by extraction and a hierarchical biaxial stretching strategy, it achieves highly oriented molecular chains to enhance mechanical properties while precisely constructing a multi-level structure with both nanopores and micropores. The resulting film exhibits an average reflectivity >93% in the solar radiation band (0.25–2.5 μm), an average emissivity >95% in the atmospheric window (8–14 μm), a thermal conductivity <0.1 W / (m·K), and a tensile strength >30 MPa. This invention solves the technical bottleneck of achieving high reflectivity, high emissivity, low thermal conductivity, and high strength simultaneously in radiation cooling materials, and can be widely applied in building energy conservation, outdoor equipment thermal management, and electronic device heat dissipation.

The invention relates to the field of temperature sensing, and particularly provides a microcavity optical fiber Fabry-Perot temperature sensor based on a metal wire and a preparation method thereof.The temperature sensor comprises an optical fiber, a hollow pipe and the metal wire, one end of the optical fiber is connected with one end of the hollow pipe, the inner diameter of the hollow pipe is smaller than the diameter of the optical fiber, and the end, away from the optical fiber, of the hollow pipe is closed; one end of the metal wire is fixedly arranged at the closed end of the hollow tube, the free end of the metal wire is opposite to the optical fiber, and a microcavity is formed between the end face of the free end of the metal wire and the end face of the side, close to the metal wire, of the optical fiber; incident laser enters from one end, far away from the hollow tube, of the optical fiber and exits from the incident end of the optical fiber after being reflected by the micro-cavity, the length of the micro-cavity is changed by the temperature, so that the spectrum of the emergent laser is changed, and the temperature change is detected by the spectrum. The invention further discloses a preparation method of the sensor. The micro-cavity optical fiber Fabry-Perot temperature sensor based on the metal wire can realize sensitive detection of high temperature.

The invention discloses a preparation method of a photovoltaic crystalline silicon polishing agent, which comprises the following steps: step 1, adding a surfactant into an organic solvent for fully dissolving to prepare a mixed solution for later use; and step 2, adding basic alkali liquor and deionized water into the mixed solution in the step 1, and uniformly stirring until all components in the solution are uniform. The photovoltaic crystalline silicon polishing agent has the beneficial effects that the brightening agent and the additive with a protective effect are fully fused into the basic alkali liquor, so that the polishing efficiency of the photovoltaic crystalline silicon polishing agent on the photovoltaic crystalline silicon is improved when the photovoltaic crystalline silicon polishing agent is used, meanwhile, the smoothness of the back surface of the photovoltaic crystalline silicon is ensured, the reflection efficiency of the photovoltaic crystalline silicon on penetrating light is improved, and the service life of the photovoltaic crystalline silicon is prolonged. In addition, the photovoltaic crystalline silicon polishing agent can effectively reduce the concentration of alkali liquor in the polishing process of photovoltaic crystalline silicon, the polishing process is controllable, the problem of emission caused by organic alkali liquor can be effectively avoided, and the photovoltaic crystalline silicon polishing process is more environmentally friendly.

The invention relates to laser cutting equipment which comprises a rack, a laser generator, a laser head and an optical transmission assembly are arranged on the rack, the optical transmission assembly comprises four reflectors, and the first reflector and the second reflector are arranged at the end, close to a light beam outlet of the laser generator, of the rack. The mirror surfaces of the first reflector and the second reflector are perpendicular to each other, the third reflector is located at the end, away from the second reflector, of the rack, the mirror surfaces of the third reflector and the fourth reflector are perpendicular to each other, a first moving plate and a second moving plate are slidably connected to the rack, and the third reflector and the fourth reflector are arranged on the first moving plate. The laser head is arranged on the second moving plate, a driving assembly is arranged on the rack and drives the first moving plate and the second moving plate to move in the same direction, the moving speed of the second moving plate is twice that of the first moving plate, and the total optical path of laser beams is constant through the driving assembly. The cutting device has the effect of improving the cutting quality.

The invention discloses a flip LED chip capable of improving brightness and a preparation method thereof, a transparent conductive layer is prepared and generated on a P-GaN layer, a first insulating layer and a second insulating layer are sequentially deposited on the transparent conductive layer, and the second insulating layer covers the surface of the LED chip with the prepared transparent conductive layer; performing etching at positions, corresponding to the P-GaN layer, of the first insulating layer and the second insulating layer according to a preset interval to generate conductive holes communicated with the P-GaN layer, and performing etching at positions, corresponding to the N-GaN layer, of the first insulating layer and the second insulating layer to expose the N-GaN layer; a metal layer is formed on the outer surface of the second insulating layer through evaporation, the conductive hole is filled with the metal layer to form a contact interface with the P-GaN layer, and the metal layer extends to the exposed area of the N-GaN layer and covers at least part of the surface of the N-GaN layer; and depositing and forming a third insulating layer and a fourth insulating layer which are sequentially stacked on the metal layer. According to the invention, the overall brightness and reliability of the flip LED chip are improved under the condition that the forward voltage is not obviously increased.

The utility model provides a special-shaped vehicle lamp light guide assembly and a vehicle. The special-shaped vehicle lamp light guide assembly comprises a light guide plate and a light guide plate, internally assembling a mirror; the light guide plate is arranged opposite to the inner lens, and the light guide plate is provided with a low beam end and a high beam end; the light guide plate comprises a light guide plate body and at least one light mixing gain structure on the side, away from the inner lens, of the light guide plate body, and the light mixing gain structure is connected with the low beam end and the high beam end. In the direction from the near light end to the far light end, the bending state of the light mixing gain structure is matched with the shape of the light guide plate; and the light source is arranged at the near light end of the light guide plate. According to the LED atmosphere lamp, the problem that obvious brightness difference occurs due to the design when a large included angle exists between the incident light direction of the LED particles and the modeling trend of the atmosphere lamp is solved.

The present invention discloses a display panel, comprising: a buffer layer is arranged on the surface of a substrate; a first metal reflective layer is arranged on the buffer layer, the first metal reflective layer comprises a first side wall and a second side wall inclined to the surface of the substrate, the angle between the first side wall and the second side wall is 90 degrees, and the first metal reflective layer is used to reflect light; a thin film transistor is arranged on the buffer layer; a second insulating layer is arranged on the thin film transistor and the first metal reflective layer; an anode is arranged on the second insulating layer; a pixel definition layer is arranged on the anode, and a first hole is arranged on the pixel definition layer; a first light-emitting layer is arranged in the first hole; and a cathode is arranged on the pixel definition layer. The above technical solution can improve the reflection efficiency, display effect and viewing angle of the display panel.

The high-reflectivity reflective film comprises a first reflective layer, a microstructure layer, a base material layer, a second reflective layer and an adhesive layer which are sequentially arranged from top to bottom, wherein the micro-structure layer is a microprism structure arranged on the base material layer, the microprism structure is composed of a plurality of microprisms with the same height or more than one microprism with the same height, a V-shaped strip-shaped structure is arranged between every two adjacent microprisms, and the second light reflecting layer is arranged below the base material layer and plays a role in reflecting light again. According to the reflective film, under the action of the microprism structure, the first reflective layer and the second reflective layer, the light conversion efficiency can be effectively improved, the highest reflectivity of the reflective film can reach 92% or above, the second reflective layer is blocked by the base material layer and the microstructure layer and can be better protected, and therefore the service life of the reflective film is prolonged.

The present invention belongs to the technical field of photovoltaic carports, and discloses a reflective film type optimal inclination angle double-sided power generation photovoltaic carport, comprising two support control parts, a shielding component is connected between the two support control parts, a reflective material is posted on the surface of the shielding component at one end away from the ground, a photovoltaic component is slidably provided at the end of the shielding component away from the ground, a support column is connected at the middle position of the two support control parts, one end of the support column is connected to the shielding component, and a plurality of cleaning components are fixedly provided at the end of the shielding component away from the ground; by arranging a bending belt and a flexible shielding plate, the angle and arc surface of the shielding plate can be adjusted according to different light intensities, which is convenient for converging sunlight, reducing the scattering of sunlight on the reflective material, and affecting the absorption of sunlight by the bidirectional solar panel.

The invention relates to the technical field of solid-state spin sensing, in particular to optical fiber probe current measuring equipment based on a remote energy supply technology, which is used for measuring the magnitude of current in an electrified conductor and comprises a primary ring, a plurality of optical fiber probes, an electromagnetic shielding chamber, an insulator and a secondary cabinet, the current measurement equipment using the optical fiber probe reduces the power consumption demand of a laser, so that the current measurement equipment can be arranged at the detection front end and is powered by a photocell module, the problems of short-wave excitation light remote transmission loss and disturbance are avoided, in addition, the higher photoinduced fluorescence reflection efficiency is realized, and the detection accuracy is improved. The photoluminescence can be effectively collected at the detection rear end, a corresponding collection structure does not need to be designed at the detection front end, and the complexity of a fluorescence collection structure is relatively reduced.

The present invention relates to an LED package including a bump in a window substrate, and a method for manufacturing the same, the LED package including: an LED chip having a light emitting portion for diffusing a light source on one surface and a contact pad portion for electrical connection on the other surface opposite to the one surface; a substrate including a plurality of windows formed through each other at a predetermined interval, a connection pad electrically connected to the outside on a surface other than the windows, a first contact surface provided on the connection pad close to the windows, and a second contact surface on the connection pad located further away from the windows than the first contact surface, the welding ball is arranged on the second contact surface, the LED chip is arranged in the window, the light-emitting part is exposed towards the other surface, and the first contact surface and the contact pad part are bonded through a conductive wire; and a fluorescent molding member having a groove covering the other surface of the substrate and into which a part of the light emitting portion is inserted, and an inclined surface for expanding an illumination angle of the light source emitted by the light emitting portion.

The invention provides a lateral light guide optical fiber and an optical imaging mechanism with the same, the lateral light guide optical fiber comprises a first optical fiber, two ends of the first optical fiber are a light source end and an emergent end respectively, the light source end is used for receiving an external light source, and a fiber core and a first cladding guide the external light source from the light source end to the emergent end in an internal reflection mode. An included angle is formed between the first inclined plane and the extension direction of the first optical fiber, a second cladding is arranged on the surface of the first inclined plane, and a third cladding is arranged on the surface of the side, opposite to the first inclined plane, of the first optical fiber, so that light reflected by the interface of the fiber core and the second cladding is irradiated outwards through the interface of the fiber core and the third cladding. According to the scheme provided by the invention, the emission angle of the light beam is optimized through the inclined plane design, the adjustment of the light output angle and intensity can be realized, the light signal intensity of the received light is ensured, and greater design freedom degree and flexibility are provided, so that the light source can better meet the requirement of detecting the detected tissue.

The invention relates to the field of sensor materials, and particularly discloses a high-temperature-resistant and corrosion-resistant sensor air chamber and a preparation method thereof.The sensor air chamber comprises an air chamber blank, and the air chamber blank is prepared from C, Mn, Si, Ni, Cr, S, P, Mo and the balance Fe; the preparation method comprises the following steps: S1, preparing an air chamber green body: adding raw materials according to the proportion, smelting, pouring into a mold, cooling, solidifying, forming and demolding to obtain the air chamber green body; s2, the surface of the air chamber blank is cleaned, and then the air chamber blank is soaked in a chemical polishing solution to be subjected to chemical polishing treatment; s3, physical polishing is conducted through abrasive paper after chemical polishing; and S4, cleaning and drying the physically polished inner wall to obtain the sensor air chamber. The sensor gas chamber has the characteristics that the thermal stability and the corrosion resistance of the sensor gas chamber are improved, so that the sensor gas chamber keeps good optical reflection performance under a high-temperature condition and a corrosive gas condition.

The utility model discloses a chip-level light-emitting diode packaging piece with a 180-degree light-emitting angle. The chip-level light-emitting diode packaging piece comprises an LED chip, the fluorescent film covers the top surface of the LED chip; the first reflecting layer is arranged on the periphery of the LED chip in a surrounding manner, and an electrode of the LED chip is exposed out of the first reflecting layer; the light transmitting layer is arranged above the fluorescent film and the first reflecting layer; and the light shielding layer is arranged above the light transmitting layer. According to the utility model, the light-emitting angle of the chip can be increased, the number of particles used by the backlight application LED can be reduced, the cost can be reduced, the fluorescent film can be protected, and the high color gamut of the device can be realized.

The utility model provides a dual-mode rearview mirror and a vehicle. The dual-mode rearview mirror comprises a rearview mirror body and a reflecting mirror. The reflector covers the rearview mirror, is attached to the rearview mirror and is detachably connected with the rearview mirror. When the rearview mirror is used, the physical rearview mirror is taken down, when the reflecting mirror is used, the physical rearview mirror is connected with the rearview mirror in an attached mode, the distance between the reflecting mirror and the rearview mirror is avoided, the thickness of the dual-mode rearview mirror is reduced, attractiveness of the dual-mode rearview mirror is facilitated, the rearview mirror and the reflecting mirror are arranged in a split mode, mutual influence between the rearview mirror and the reflecting mirror can be avoided, and the appearance is attractive. The reflection efficiency of the reflector is improved, and the power consumption of the rearview mirror is reduced.

The utility model provides an electromagnetic shielding film with high reflectivity. The electromagnetic shielding film comprises an insulating layer, and a conductive layer, a conductive adhesive layer and a protective layer which are sequentially arranged on one surface of the insulating layer, wherein the absolute value of the difference between the dielectric constant of the protective layer and the dielectric constant of the conductive adhesive layer is greater than 1. According to the embodiment of the utility model, the absolute value of the difference between the dielectric constant of the protective layer and the dielectric constant of the conductive adhesive layer is greater than 1, so that electromagnetic waves can be better reflected, and the reflection efficiency of the electromagnetic shielding film to the electromagnetic waves is improved.

The present disclosure provides a light emitting diode and a light emitting diode preparation method. The light emitting diode comprises a first epitaxial structure, a second epitaxial structure, a first insulating reflective layer, a connecting electrode and a second insulating reflective layer; the first epitaxial structure and the second epitaxial structure each comprise a step structure, the step structure comprising a step top surface and a step bottom surface; the first epitaxial structure and the second epitaxial structure are arranged at intervals; the first insulating reflective layer is located in an isolation groove between the first epitaxial structure and the second epitaxial structure, and one side of the surface of the first insulating reflective layer is connected to the step bottom surface of the first epitaxial structure, and the other side of the surface of the first insulating reflective layer is connected to the step top surface of the second epitaxial structure; the connecting electrode is located on the first insulating reflective layer and is electrically connected to the step bottom surface of the first epitaxial structure and the step top surface of the second epitaxial structure, respectively; and the second insulating reflective layer covers the connecting electrode, the first insulating reflective layer, the first epitaxial structure and the second epitaxial structure.

The invention provides a waste gas treatment device and method, and relates to the technical field of waste gas treatment. The device comprises a panel lamp assembly and a flat reaction chamber structure, efficient waste gas degradation without a catalyst is achieved through the characteristic that high photon energy of 172nm excimer ultraviolet light can crack most organic matter, particularly, a reflection structure is designed, 172nm excimer ultraviolet light can be efficiently reflected, the structure is formed by alternately stacking a plurality of dielectric material layers, and the dielectric material layers are arranged in the flat reaction chamber structure. The design strictly follows the 1 / 4 wavelength optical thickness principle, the reflectivity is improved to 90% or above through the optical interference effect, 172nm ultraviolet light is efficiently reflected back to a channel space, and the light energy utilization rate is remarkably improved. Through the synergistic effect of the technical characteristics, the waste gas treatment device can efficiently degrade various VOCs (volatile organic compounds), especially stubborn organic compounds, and the waste gas treatment efficiency and stability are remarkably improved.

The utility model provides an electromagnetic shielding film, which comprises an insulating layer, and a conductive layer, a conductive adhesive layer and a protective layer which are sequentially arranged on one surface of the insulating layer, the first reflecting layer is arranged between the conductive layer and the conductive adhesive layer, the material of the first reflecting layer is different from that of the protective layer, and the absolute value of the difference value between the dielectric constant of the first reflecting layer and the dielectric constant of the protective layer is larger than 1. According to the embodiment of the utility model, the material of the first reflecting layer is different from that of the protective layer, and the absolute value of the difference between the dielectric constant of the first reflecting layer and the dielectric constant of the protective layer is greater than 1, so that electromagnetic waves can be better reflected, and the reflection efficiency of the electromagnetic shielding film to the electromagnetic waves is improved.

This utility model discloses a screen structure and a high-gain white screen, belonging to the field of projection display technology. The screen structure includes two substrate layers, with a barrier layer bonded between the two substrate layers via an adhesive layer. The substrate layers, adhesive layer, and barrier layer have different refractive indices. The high-gain white screen includes a protective layer, a diffusion layer, and the aforementioned screen structure, arranged sequentially from the incident surface to the back surface. By utilizing the difference in refractive indices between the substrate layer, adhesive layer, and barrier layer, an optical effect similar to mother-of-pearl is created, reducing light penetration and enhancing light reflection and scattering. This improves detail rendering, reduces the loss of dark areas, enhances resistance to external light interference, reduces contrast, reduces color saturation distortion, reduces light loss during propagation, improves overall brightness uniformity, ensures full presentation of high-resolution signal details, and is compatible with more projection devices.

The invention discloses a gap reflecting film for a photovoltaic module and a preparation method thereof.The reflecting film comprises a base material layer, a bonding layer located below the base material layer and a reflecting layer located above the base material layer, a plurality of microstructures formed through imprinting are arranged on the reflecting layer in an array mode, and the microstructures are strip-shaped triangular prism structures which are continuously arranged in parallel; the bottom surfaces of the strip-shaped triangular prism structures are connected to the surface of the reflecting layer in parallel, and the top edges of the strip-shaped triangular prism structures protrude out of the surface of the reflecting layer. Different from an existing scheme which adopts a three-layer structure of a base material, a microstructure layer and a reflecting layer to realize reflection, the reflecting function is directly realized through the base material and the reflecting layer, and the strip-shaped triangular prism microstructure is directly prepared on the aluminum-plated or silver-plated reflecting layer by using an imprinting-wet etching process; the problem of low adhesive force between the ultraviolet glue and a base material can be effectively avoided; the strip-shaped triangular prism microstructure is obtained by directly etching the aluminum-plated reflecting layer, pinholes do not exist, and the reflecting efficiency is higher.