176 results about "Refractive index matching" patented technology

The invention relates to the technical field of lenses, in particular to a film for vision correction and a lens, and the film for vision correction is deposited on the surface of a lens substrate and comprises a refractive index matching layer, a refraction compensation layer, an out-of-focus prevention and control layer, a blue light interference prevention layer and a super-hydrophobic wear-resistant layer which are sequentially arranged from bottom to top; the refraction compensation layer covers in a full-aperture mode and forms an optical area used for refraction correction in a central area, and the film thickness of the refraction compensation layer is decreased progressively from the center to the edge; the defocusing prevention and control layer covers the peripheral annular area of the optical area and comprises an annular transition belt and a main body defocusing area extending outwards from the outer edge of the annular transition belt; the out-of-focus prevention and control layer is composed of a ZrO2-epoxy resin compound; the inner film thickness of the annular transition zone is linearly increased from inside to outside, the concentration of the ZrO2 nanoparticles is induced to gradually change through a radial electric field, a refractive index radial gradient is formed, the concentration of the ZrO2 nanoparticles in the main body defocusing zone is constant, and peripheral defocusing is maintained through secondary increase of the film thickness.

The invention relates to the technical field of semiconductor chip packaging, in particular to a photoelectric co-packaging optical coupling passive alignment packaging structure and method. According to the invention, high-precision automatic alignment of the grating coupler in the optical chip and the through hole of the adapter plate is realized by using the solder ball tension effect in the flip reflow soldering process of the optical chip, and a stable optical limiting structure is formed. The passive coupling of the optical elements (such as bare optical fibers, optical fiber arrays, reflectors and the like) and the grating coupler is realized by placing the optical elements with matched sizes in the via holes of the adapter plate and completing refractive index matching and structure fixing by using curing glue. The whole process does not need additional active alignment equipment, is the same as a traditional chip packaging process, has the advantages of being simple in process, low in cost and high in packaging efficiency, and is a key packaging technology of a photoelectric co-packaging system in the future.

The invention relates to a high-efficiency super lens based on refractive index matching and a design method thereof. The super lens comprises a super atom structure layer and a bonding substrate layer on any surface, the difference value between the refractive index of any substrate layer and the average effective refractive index of the super-atomic structure layer is smaller than a preset value; when the super lens is designed, the relation among the average effective refractive index, the impedance and the S parameter of the super-atom structure layer is constructed, the structure parameter of the super-atom structure layer is determined based on the requirement parameter of the super lens, the preset S parameter of the super-atom structure layer is obtained based on electromagnetic simulation, and the average effective refractive index of the super-atom structure layer is calculated. And the substrate layer is used as an expected refractive index matching material and is bonded on one surface or two surfaces of the super-atomic structure layer. According to the invention, the high-efficiency super lens is obtained by using the principle of refractive index matching and processing methods such as large-area bonding, the focusing efficiency of the super lens is greatly improved, the application of the super lens is promoted, and the leap-type upgrading of optical devices in the dimensions of light weight and high performance is realized.

The invention provides a system and a method for detecting geometric parameters of an optical fiber with a longitudinal periodic structure. The system comprises an optical fiber clamp used for fixing a test part of the optical fiber to be detected in optical fiber refractive index matching oil in a space image imaging device; the light source is used for emitting test light to the collecting lens through the optical fiber bundle, and the test light is focused into a focused light spot through the collecting lens and then is sequentially emitted to the space image imaging device and the detection device; the space image imaging device is used for moving along the axis direction of the to-be-tested optical fiber based on a preset moving speed after the test light passes through a test part in the optical fiber refractive index matching oil so as to form an optical imaging signal corresponding to the test part; and the detection device is used for acquiring geometric parameters of the periodic structure in the to-be-detected optical fiber according to the optical imaging signal. According to the invention, the detection device can accurately obtain the periodic structure geometric parameters of the to-be-detected optical fiber, and the detection precision and reliability are improved.

The invention relates to a coastal zone sediment erosion pore scale flow field observation system and observation method. The observation system comprises a wave-flow water tank, a sediment accumulation body arranged in the wave-flow water tank and PIV equipment used for observing the internal flow field and the pore size of sediment. A wave making plate and a wave dissipating plate opposite to the wave making plate are arranged in the wave flow water tank, experimental fluid used for simulating waves is arranged between the wave making plate and the wave dissipating plate, and a wave height meter floats on the experimental fluid; the sediment accumulation body is formed by accumulation of transparent solid particles with the same refractive index as the experimental fluid; the PIV equipment comprises a laser light source and a camera, the laser light source is focused on the sediment accumulation body, and the camera directly faces the sediment accumulation body and is used for collecting images. Compared with the prior art, a clearer sediment pore internal flow field image is obtained through the combination of the refractive index matching technology and the image particle velocity measurement method, so that effective observation of the pore scale flow field eroded by the sediment in the coastal zone is realized.

The invention provides a thin-film lithium niobate modulator based on a stacked double-layer capacitive electrode, and belongs to the technical field of thin-film lithium niobate electro-optical modulators. The modulator sequentially comprises a silicon substrate layer, a silicon dioxide lower cladding, a lithium niobate waveguide layer, a ridge-shaped optical waveguide layer, a silicon dioxide thin cover layer, a thin accumulation type double-layer capacitive electrode structure, a thick ground-signal-ground traveling wave electrode and a silicon dioxide upper cladding from bottom to top, wherein the ridge-shaped optical waveguide layer, the silicon dioxide thin cover layer, the thin accumulation type double-layer capacitive electrode structure, the thick ground-signal-ground traveling wave electrode and the silicon dioxide upper cladding are formed by etching the upper surface of the lithium niobate layer. The ground-signal-ground traveling wave electrode is composed of a first ground transmission electrode, a signal transmission electrode and a second ground transmission electrode. The stacked double-layer capacitive electrode structure comprises a periodic metal electrode with a stacked structure in a top view and a stepped metal electrode in a side view. The thin film lithium niobate modulator of the stacked double-layer capacitive electrode can realize refractive index matching, better impedance matching, low microwave loss and ultra-large electro-optical bandwidth.

The invention relates to a nonlinear optical crystal and crystal combined adhesive and a preparation method thereof. The nonlinear optical crystal and crystal combined adhesive comprises the following components in parts by weight: 40-70 parts of hydrogenated bisphenol A type acrylate monomer; 20 to 40 parts of a polyfunctional thiol compound; the core of the core-shell structure nanoparticles is ZrO2, the shell of the core-shell structure nanoparticles is SiO2, the particle size of the core is 20-50nm, and the thickness of a shell layer is 3-8nm; and 0.1 to 0.5 part of a coupling agent containing a phosphate group. Through accurate regulation and control of the ZrO2atSiO2 core-shell nanoparticles, the refractive index of the adhesive can be adjusted in a range of 1.65-2.10, and is highly matched with the refractive index 1.7-2.2 of nonlinear optical crystals such as KTP, BBO and LBO, so that the Fresnel loss of a bonding interface is reduced to be less than or equal to 0.5 dB / cm, the laser frequency conversion efficiency is remarkably improved, agglomeration is effectively inhibited by the core-shell structure of the nanoparticles, and the laser frequency conversion efficiency is improved. The light transmittance of a cured adhesive layer under common laser wavelengths such as 1064 nm, 532 nm and 355 nm is larger than or equal to 99.5%, the adhesive layer is suitable for a high-power laser system, by adding the quantum dot material, the refractive index matching of the specific wavelength can be further optimized, and the application scene is expanded.

The invention provides an optical fiber defect detection system and method, and the system comprises an optical fiber fixing groove which is used for fixing the two ends of a to-be-detected optical fiber after the to-be-detected optical fiber passes through refractive index matching oil in an optical amplification device; the broadband light source is arranged on the light inlet side of the optical amplification device and is used for emitting detection light to the optical amplification device; the visible light source is connected with one end of the to-be-measured fiber and used for emitting visible light to the to-be-measured fiber; the optical amplification device is used for moving along the axis direction of the optical fiber to be detected and amplifying the detection light; after the detection light passes through the refractive index matching oil in the optical amplification device, the detection light is emitted to the optical imaging device from the light emitting side of the optical amplification device; and the optical imaging device is used for generating a corresponding optical imaging result according to the detection light emitted by the light emitting side of the optical amplification device and the visible light passing through the to-be-detected optical fiber so as to obtain defect detection information of the to-be-detected optical fiber. According to the invention, the accuracy and efficiency of optical fiber defect detection are improved.

A light-emitting device includes a transparent substrate less than 60 μm thick, a semiconductor diode structure on one surface of the substrate, and a wavelength-converting layer less than 50 μm thick on the other surface and the sidewalls of the substrate. The wavelength-converting layer includes luminescent particles having D50 less than 20 μm that are bound together or to the substrate by an inorganic coating medium less than 700 nm thick that is index-matched with the substrate. inorganic binder, optical sidewall coating, and an optical sidewall structure. The luminescent particles absorb light emitted by the semiconductor diode structure at a first wavelength and emit light at a second, longer wavelength.

The invention discloses europium-doped hydrotalcite for enhancing PVC (polyvinyl chloride) light transmission and a preparation method and application thereof, and belongs to the technical field of high polymer materials and inorganic nanomaterials. Trivalent europium (Eu < 3 + >) is doped into a lattice structure of LDHs (layered double hydroxides) through europium-doped coprecipitation, surface silanization and ultrasonic dispersion technologies; refractive index matching (1.50-1.53) is achieved, and light scattering is reduced. The particle size of the optimized hydrotalcite is controlled to be 50-150 nm, so that the light transmittance of the PVC composite film reaches 93% or above, and meanwhile, the PVC composite film has the characteristic of red fluorescence. Compared with the prior art, the material has the advantages that the transparency is improved, the heat-resistant stability and aging resistance of PVC are remarkably improved, the material is suitable for the fields of transparent films, daylighting panels, optical marks and the like, and the hydrotalcite nano material provided by the invention has the dual effects of refractive index matching and conversion from ultraviolet light to visible light; the light transmittance and the ageing resistance of the PVC material can be obviously improved at the same time.

The invention relates to the technical field of fiber bragg grating preparation, and provides a femtosecond laser phase mask FBG inscribing system based on an off-axis parabolic cylindrical mirror, which comprises a grating inscribing light path system, an off-axis parabolic cylindrical mirror, a phase mask plate and a glass slide which are sequentially arranged along the light path direction, and is characterized in that the grating inscribing light path system emits laser into one end of the cylindrical surface of the off-axis parabolic cylindrical mirror; one end of the off-axis parabolic cylinder of the off-axis parabolic cylinder mirror focuses the laser and emits the laser into the phase mask plate, and the phase mask plate is arranged above the off-axis parabolic cylinder mirror and can generate interference fringes for inscribing the optical fiber; an optical fiber inscribing area is formed on the upper surface of the glass slide, optical fiber refractive index matching liquid is arranged on the optical fiber inscribing area, an optical fiber to be inscribed is attached to the optical fiber inscribing area of the glass slide and placed in the refractive index matching liquid, and FBG inscribing is conducted on the optical fiber to be inscribed through interference fringes generated by the phase mask plate. According to the invention, the energy density of the focusing light spot is obviously improved, and the laser beam can be accurately focused on the optical fiber core.

The invention discloses a method for wrapping high-refractive-index ceramic powder with a low-refractive-index product layer and a ceramic material, and relates to the technical field of ceramic additive manufacturing. The method comprises the following steps: forming a low-refractive-index product layer on the surface of ceramic powder through a physical vapor deposition method, a chemical vapor deposition method or a hydrothermal method; the material of the low-refractive-index product layer comprises at least one of silicon dioxide, aluminum oxide, yttrium oxide or yttrium aluminum garnet; the ceramic powder is high-refractive-index ceramic powder and comprises at least one of silicon carbide, silicon nitride or aluminum nitride. According to the method, on the premise that the powder body is prevented from being damaged and impurities are prevented from being introduced, a coating layer which is uniform, compact and good in refractive index matching is formed, and therefore the curing depth and printing reliability of the high-refractive-index ceramic powder in photocuring forming are effectively improved.

The present application relates to a kind of method and structure for inhibiting energy loss, solve the current liquid crystal wave sheet energy transmittance is not low problem.Structure includes: liquid crystal layer;With the first orientation film and the second orientation film respectively contacted with the two sides of liquid crystal layer, for orientation liquid crystal layer;First substrate and second substrate;Air-substrate interface refractive index matching film is respectively plated in the outer side of two substrates, for reducing the Fresnel reflection energy loss of air and first substrate, air and second substrate interface;Conductive film is respectively plated in the inner side of two substrates, for driving liquid crystal layer;First conductive film-liquid crystal refractive index matching film and second conductive film-liquid crystal refractive index matching film are respectively plated on two conductive films, for reducing the energy loss caused by interface between conductive film and liquid crystal layer.The structure can significantly improve the energy utilization efficiency of liquid crystal wave sheet, meet the needs of high efficiency, large angle, non-continuity light beam deflection based on liquid crystal wave sheet and liquid crystal polarization grating.

The utility model discloses a volume holographic optical waveguide exposure structure and an assembling, disassembling and assembling and disassembling device thereof. The exposure structure comprises a volume holographic optical waveguide, a prism, light-absorbing glass and a jig, wherein the jig comprises a first jig and / or a second jig; the volume holographic optical waveguide is provided with a first surface and a second surface which are opposite to each other, the prism covers the first surface of the volume holographic optical waveguide, the light-absorbing glass covers the second surface of the volume holographic optical waveguide, the first jig is arranged between the prism and the volume holographic optical waveguide, and the second jig is arranged between the light-absorbing glass and the volume holographic optical waveguide; a first through hole is formed in the center of the first jig, one end of the first through hole is communicated with the surface of the holographic optical waveguide, the other end of the first through hole is communicated with the surface of the prism, and a first closed space filled with refractive index matching oil is defined by the three; a second through hole is formed in the center of the second jig, one end of the second through hole is communicated with the surface of the holographic optical waveguide, the other end of the second through hole is communicated with the surface of the light-absorbing glass, and a second closed space filled with refractive index matching oil is defined by the three.

A liquid polymer is deposited onto the end face of an optical fiber and cured to form a matching layer having an outer surface that faces away from the end face. During the curing process, the optical fiber may be oriented so the end face faces downward to produce a matching layer having a curved outer surface, or oriented so the end face faces upward to produce a matching layer having a flat outer surface. The end face may include a peripheral area formed from an easy-to-clean coating that confines the liquid polymer to the core and cladding areas of the end face. The easy-to-clean coating also prevents spillover of the liquid polymer onto the cladding of the optical fiber. Matching layer thickness may be tuned using a spin coating process.

The application discloses a wide-angle optical antireflection method based on equivalent gradient refractive index matching and phase angle restriction, and the method can solve the problem that some medium materials corresponding to the refractive index do not exist, so as to meet the needs of subsequent gradient refractive index matching, by selecting two medium materials with different refractive indexes and respectively controlling the thickness of the medium layers, and converting the medium layers into equivalent medium layers with different equivalent refractive indexes and equivalent thicknesses according to a transmission matrix. In addition, the change of the propagation phase is restricted by limiting the propagation angle of the incident light in the medium layer, so as to realize the insensitivity of the propagation phase to the angle change, meet the needs of wide-angle transmission enhancement, and determine the medium material corresponding to the refractive index according to the range of the propagation angle restriction. According to the above method, the medium material capable of realizing the wide-angle optical antireflection can be quickly selected, and the time cost required for selecting the medium material is greatly shortened.

The present invention relates to optical coupling between optical components, and more particularly, to an optical probe (1) configured for optical testing of at least one micro-optical component (50), a method for producing an optical probe (1), and a method for optical testing of at least one micro-optical component (50). The optical probe (1) comprises:-a probe head (10), wherein the probe head (10) comprises a test assembly (2); -at least one micro-optical element (20), where the micro-optical element (20) is a separate element with respect to the test component (2) and is in mechanical contact with the test component (2), where the micro-optical element (20) is configured to optically couple light (3) between the test component (2) and the micro-optical component (50), thereby being configured to determine an optical property of the micro-optical component (50), and wherein the micro-optical element (20) is configured to operate in an index matching liquid (17).

The present disclosure describes apparatus including a metastructure optical element and methods for manufacturing metastructure optical elements. An example method includes providing a substrate having an optical etch-deceleration layer thereon, and a stratum over the optical etch-deceleration layer. The method further includes forming a mask on the stratum, and etching the stratum and the optical etch-deceleration layer to form a plurality of groupings of meta-atoms. An amount of etching into the optical etch-deceleration layer differs for each of the each groupings of meta-atoms, such that a first one of the groupings of meta-atoms is composed of first portions of the stratum, and a second one of the groupings of meta-atoms is composed of second portions of the etched stratum and underlying portions of the optical etch-deceleration layer. The method further includes removing the mask, and encapsulating the first and second groupings of meta-atoms in a material that is index-matched to the optical etch-deceleration layer.

The invention discloses a preparation method of a flame-retardant transparent high-strength glass fiber reinforced epoxy resin-based composite material, which is characterized in that an epoxy resin matrix is doped and modified by trialkyl phosphate, so that flame-retardant modification of the composite material and refractive index matching of fiber-resin are synchronously realized; therefore, the glass fiber reinforced epoxy resin-based composite material has the characteristics of flame retardance, transparency and high strength. Wherein the flame-retardant modification of the composite material is realized by synchronously performing gas-phase flame retardance and condensed-phase flame retardance in the combustion process of trialkyl phosphate in a resin matrix, and the transparency improvement is realized by reducing the refractive index difference of resin and fiber and reducing the refraction and scattering of light rays at an interface.

An electrically-switchable liquid crystal cell (10) is provided, along with a lens (50) comprising the cell, and methods of manufacturing the cell. The liquid crystal cell (10) includes a diffractive

The invention provides a stress measuring device for glass and an optical element. A light emitting unit is used for emitting laser; the optical element comprises a first surface and a second surface, the laser emission direction of the light emission unit faces the first surface, the second surface is in contact with to-be-detected glass, and the acquisition unit is used for acquiring scattered light and processing the scattered light into data signals; the processing unit is used for determining stress distribution in the to-be-detected glass according to the data signal; wherein a plurality of supporting pieces are arranged on the second surface. Therefore, the matched refractive index liquid can be arranged between the prism and the to-be-measured glass, air is expelled, refractive index deviation of laser passing through the three media is reduced, light loss caused by an interface is reduced, and meanwhile, the problem of inaccurate measurement caused by relative sliding of the to-be-measured glass during measurement due to the refractive index matching liquid is solved.

The invention relates to a method for rapidly transparentizing biological tissues, which comprises the following steps: carrying out degreasing treatment on a fixed biological tissue sample by using a degreasing solution which is an aqueous solution containing tetrahydrofuran and tetrahydroxypropyl ethylenediamine (EDTP); the degreased biological tissue sample is subjected to refractive index matching with a refractive index matching solution, transparency treatment is completed, and the refractive index matching solution is an aqueous solution containing urea, iohexol and EDTA. According to the method for transparentizing the biological tissue, visceral organs can be transparentized quickly, tissue shrinkage is not caused, and the tissue form is reserved. In addition, the method for transparentizing the biological tissue according to the invention has the advantages of fluorescence protection, morphology retention and high biological safety.

The invention discloses a magneto-optical effect-based dynamic zooming method and an optical system, and the method comprises the steps: arranging at least one magneto-optical crystal between a pre-amplifier and a main amplifier, so as to achieve the dynamic zooming through the magneto-optical effect; wherein the magneto-optical crystal is obtained by combining anisotropic materials with matched refractive indexes, and the anisotropic materials are processed into complementary parabola shapes. According to the invention, the magneto-optic effect is utilized to realize dynamic zooming, and the mode of complementary combination of the crystals with matched refractive indexes is utilized to solve the problem that the additional wavefront shape does not conform to the demand. Compared with an electro-optical effect scheme, an applied magnetic field is a uniform magnetic field along a transmission direction, so that a depolarization problem caused by a transverse component is avoided; compared with the scheme of aperture division, grating division and the like, the dynamic zooming can be realized on the premise of not influencing the output capability of the laser.

An electrically switchable liquid crystal cell (10) is provided, as well as a lens (50) comprising the cell and a method of manufacturing the cell. The liquid crystal cell (10) comprises a diffractive optical element (12) and a liquid crystal material (14) switchable between an unmatched state and a matched state. In the mismatched state, the effective refractive index of the liquid crystal material (14) is different from the refractive index of the substrate (18) of the diffractive optical element (12). In the matched state, the effective refractive index of the liquid crystal material (14) is matched to the refractive index of the substrate (18). In the matched state, the diffractive optical element does not promote the power of the lens. The diffractive optical element (12) has a plurality of peaks (20) and valleys (30) having rounded corners.

A polarizer applied for a viewing side of a display is disclosed. The polarizer comprises a polarizing layer with an absorption axis, and a protective film disposed on the viewing side surface of the polarizing layer. The protective film includes a birefringent substrate adjacent to the polarizing layer having a birefringence difference not greater than 0.10 and having a slow axis and a fast axis perpendicular to each other, wherein the slow axis is parallel to the absorption axis of the polarizing layer, and an interference elimination layer disposed on a display side surface of the birefringent substrate, wherein the interference elimination layer has a diffusing layer disposed on the birefringent substrate, and a refractive-index-matching layer disposed on the diffusing layer, wherein with the total haze of the protective film is between 30% and 75% and the reflectivity of the protective film satisfies the relationship (RSCI−RSCE)≤1.0% and RSCE / (RSCI−RSCE)≥1.6, wherein RSCI is an average reflectivity of diffuse component and specular component (specular component included, SCI) of the protective film, and RSCE is an average reflectivity of diffuse component (specular component excluded, SCE) of the protective film.

The invention relates to a high-gloss polycarbonate fiber-added composite material and a preparation method thereof. The material comprises the following components in parts by weight: 100 parts of polycarbonate resin, 15-35 parts of PMMA coated modified glass fiber and 1.5-3 parts of a refractive index matching agent, wherein the refractive index difference delta n between a coating layer and a matrix is less than or equal to 0.02. Glass fibers are subjected to surface treatment by adopting a melting mechanical coating method, molding is performed through a double-screw extruder side feeding process, the screw shear strength is in gradient change in the axial direction, and the shear rate ratio of a strong shear area to a low shear area is larger than or equal to 4: 1. The technical problems that glass fiber reinforced polycarbonate is low in surface glossiness and serious in floating fiber are solved, the 60-degree-angle glossiness of a product is larger than or equal to 92 GU, the tensile strength is larger than or equal to 110 MPa, and the surface floating fiber rate is lower than 2%. The preparation method is environment-friendly, free of solvent discharge, stable and reliable in process and suitable for high-end application fields such as consumer electronics shells.

The application relates to a cosmetic quality detection method, an electronic device and a storage medium. The method comprises the following steps: placing a foundation liquid sample bottle in a transparent detection pool, injecting a refractive index matching liquid between a flexible transparent film on an inner wall and the inner wall; emitting at least two illumination lights with different wavelengths to the foundation liquid sample bottle to obtain multiple original images under different spectral conditions; applying mechanical vibration to the foundation liquid sample bottle, and acquiring continuous image data of a flow recovery process of the foundation liquid in the bottle after the vibration stops; generating a hyperspectral uniformity atlas based on the multiple original images, and determining a texture recovery time constant based on the continuous image data; and determining whether the texture uniformity of the foundation liquid in the foundation liquid sample bottle meets a preset standard based on the hyperspectral uniformity atlas and the texture recovery time constant. The scheme provided by the application can detect the texture uniformity of the filled foundation liquid sample bottle, and reduces the product defect risk of travel-sized foundation liquid.

The invention discloses a polyimide foaming diffusion plate and a preparation method thereof, and the polyimide foaming diffusion plate comprises the following components: modified PI resin, benzyl methacrylate-titanium dioxide composite microspheres, a silane coupling agent, an antioxidant, an ultraviolet light absorber, a hindered amine light stabilizer, liquid paraffin, a whitening agent, a foaming agent and the like. The method is characterized in that the modified PI resin is used as a diffusion plate base material, it is guaranteed that the diffusion plate has high heat resistance, meanwhile, benzyl methacrylate-titanium dioxide composite microspheres which are good in compatibility with the modified PI resin and matched with the modified PI resin in refractive index are prepared to serve as a light diffusion agent, the optical performance of the diffusion plate is effectively improved, and through formula and process innovation, the diffusion plate can be widely applied to the field of light diffusion. The polyimide foaming diffusion plate which is excellent in optical effect and mechanical property is successfully prepared.

The invention discloses a mobile phone curved screen 3D tempered film capable of eliminating a white edge phenomenon and a preparation method of the mobile phone curved screen 3D tempered film, and belongs to the technical field of mobile phone tempered films.According to the mobile phone curved screen 3D tempered film, through gradient design of an adhesive layer, the adhesive layer forms a layered structure of a high-fluidity area, a transition area and a high-viscosity curing area from the center to the edge; the glue can uniformly extend from the center to the edge during fitting, so that the problem of glue shortage or glue overflow at the edge is avoided; in the optimization of the edge structure, the design of the groove and the diversion trench further guides the accurate filling of the glue layer, and the adhesion is enhanced by matching with the pre-coating tackifier, so that the attaching gap is reduced from the physical structure; meanwhile, the refractive index of the optical cement is matched with that of the glass substrate, the refraction difference of light on an interface is reduced, the white edge phenomenon is thoroughly eliminated under the synergistic effect of multiple technologies, and the comprehensive performance of the protective film is remarkably improved. The laminating precision reaches a high level of 99.5%, and more stable, attractive and universal screen protection choices are provided for users.