1715 results about "Polarizer" patented technology

The invention relates to an antistatic PET (Polyethylene Terephthalate) base film for preparing a polaroid release film and a preparation method thereof, the release film base film is prepared by taking an optical-grade PET slice as a main body, adding modified PET with a specific structure and a modified SiO2 filler, and carrying out co-extrusion casting, a unique three-section stretching process and coating with a coating liquid. According to the invention, material modification and process improvement are carried out, specifically, an optical-grade PET slice is taken as a main body material, modified PET and a modified SiO2 filler with a specific structure are added, a film is prepared through co-extrusion casting and a unique three-section stretching process, and then the surface of the film is coated with a layer of antistatic coating liquid, so that the antistatic film is obtained. The finally prepared base film has low alignment angle, low transverse hot shrinkage rate and high surface adhesion, keeps the characteristics of high light transmittance and low haze of an optical-grade polyester film, endows the film with certain antistatic property, and is particularly suitable for being used as a release film of a high-end polaroid.

The invention discloses a transformer oil leakage detection method and device based on polarization-ultraviolet fusion imaging, and the device comprises a housing, a support, a camera, an environment induction device, an overall controller, a power supply, a polaroid rotating wheel assembly, a lens seat assembly, and an image processor. And the motor driver, the illumination intensity sensor, the ultraviolet irradiance sensor, the image processor and the power supply are electrically connected with the integral controller respectively. According to the invention, a multi-angle polarization image and a non-polarization image in the same field of view can be acquired, and then polarization characteristics contained in an oil stain fluorescence signal are extracted and effectively distinguished from non-polarization characteristics of background light; in the daytime mode, the transformer oil leakage detection device can identify a target area with relatively high polarization intensity, and through image fusion enhancement processing, non-target background signals are significantly suppressed, and the fluorescence significance of an oil leakage characteristic area is improved.

The invention relates to the technical field of image recognition, in particular to a plate defect recognition and detection method based on an image recognition model. The method comprises the following steps: aiming at the technical problems of insufficient texture direction identification precision and difficulty in defect type distinguishing in a traditional plate surface detection method, the invention provides an intelligent detection solution based on polarization imaging. A multi-angle polarization measurement system is constructed through a fixed polarizer and a rotatable analyzer, and omnibearing polarization characteristic collection of the surface of a steel plate is achieved. A polarization intensity change model is established based on the Malus law, the polarization degree and polarization angle parameters of each pixel point are extracted, and a polarization parameter spatial distribution diagram reflecting the surface microstructure is constructed; through statistical analysis of polarization angle distribution characteristics, a rolling direction dominant angle is identified by adopting a peak detection algorithm, and accurate classification and severity evaluation of defects are realized in combination with anisotropy characteristic analysis.

The invention discloses a method for detecting residual stress of a birefringent crystal, which is characterized by comprising the following steps of: fixing a sample to be detected on a sample loading table; the imaging lens is used for acquiring light rays which sequentially penetrate through the polarizer module, a sample to be detected on the sample loading table, the analyzer module and the camera module in four states in three states that polarization axes of the polarizer module and the analyzer module are mutually orthogonal and a polarization angle is gradually increased by 30 degrees, and in a state that the polarizer module and the analyzer module are in parallel, and the imaging lens is used for acquiring the light rays which sequentially penetrate through the polarizer module, the sample to be detected on the sample loading table, the analyzer module and the camera module in the four states; collecting a light intensity matrix set through a camera module; acquiring a reference light intensity matrix through normalized linear superposition, and performing pixel-by-pixel operation with the reference light intensity matrix on the basis of the first light intensity matrix, the second light intensity matrix and the third light intensity matrix to acquire corresponding phase delay matrixes; eliminating natural birefringence and updating a phase delay matrix by deducting respective overall average phase delay amount pixel by pixel; through pixel-by-pixel weighted stacking, isogradient lines are eliminated, and distribution information of residual stress is obtained.

The invention discloses a liquid crystal display filtering and light transmission performance monitoring system and a monitoring method thereof, and relates to the technical field of liquid crystal displays. An ambient light real-time monitoring module; a dual-optical-path differential measurement module; a signal processing and intelligent compensation module; a polarizer dynamic adjustment module; a data storage and analysis module; light intensity fluctuation data are collected in real time through an ambient light real-time monitoring module, reference light and transmission light are synchronously collected through a double-light-path differential measurement module, a signal processing and intelligent compensation module calls a self-adaptive algorithm library, compensation coefficients are calculated in combination with ambient light spectrum data, and a polaroid adjusting instruction is generated. And then an adjusting instruction is sent to the polaroid dynamic adjusting module through the CAN bus, the polaroid dynamic adjusting module feeds back an actual thickness value in real time after adjustment is completed, closed-loop control is formed, and through real-time compensation of ambient light and dual-light-path differential measurement, the influence of a station LED lamp and natural light is eliminated, and the monitoring precision of light filtering and light transmission performance is improved.

The disclosure provides a display module and a display device. The display module includes a display area and a non-display area. The display module further includes a substrate, and a first signal line, an inorganic protective layer, a spacer layer and a polarizer which are disposed on the substrate. The inorganic protective layer is located at least in the non-display area and on a side of the first signal line away from the substrate, the spacer layer is located at least in the non-display area and between the inorganic protective layer and the substrate, and the polarizer is located on a side of the inorganic protective layer facing away from the substrate and covers the display area and extends to the non-display area. In the non-display area, the polarizer includes a first boundary.

The invention discloses a semiconductor laser, which comprises a laser light source; the polarizer comprises an incident side, a first reflection light-emitting side, a second reflection light-emitting side and a transmission light-emitting side; the first wave plate is arranged on the first reflection light emitting side; the second wave plate is arranged on the transmission light-emitting side; during working, laser emitted by the laser light source comprises first polarized light and second polarized light, the polarization directions of the first polarized light and the second polarized light are perpendicular to each other, and the laser enters the polarizer from the incidence side; the first polarized light is reflected by the polarizer, passes through the first wave plate to be subjected to polarization turning and is emitted along a first emergent light path, and part of light reflected back along the first emergent light path on the working surface passes through the first wave plate to be subjected to polarization turning again and passes through the polarizer to be emitted from a second reflection emergent light side; the second polarized light passes through the polarizer and the second wave plate to be subjected to polarization turning and is emitted out along a second emergent light path, and part of light reflected back along the second emergent light path on the working surface is subjected to polarization turning through the second wave plate again, then enters the polarizer and is reflected out from the second reflection emergent light side.

A zero-optical-path-difference double-frequency heterodyne grating ruler comprises a light source, a signal detecting and processing system, a polarization splitting prism, a first quarter-wave plate, a rectangular prism, a second quarter-wave plate, a third quarter-wave plate, a total reflection mirror, a long-strip prism, a reference grating and a 45-degree-placed polaroid. The two measuring light paths of the system always keep zero optical path difference, so that the measuring precision can be ensured, and the environmental stability of the system is also remarkably improved. And a high-precision and high-robustness measurement scheme is provided for precision equipment such as a photoetching machine and a precision motion platform.

A magnetoresistive memory cell includes a magnetic polarizer layer having a hard magnetization along a hard magnetization direction, a first magnetic tunnel junction located on a first side of the magnetic polarizer layer and including a first reference layer having a first side facing the magnetic polarizer layer, a first free layer facing a second side of the first reference layer, and a first tunnel barrier layer located between the first free layer and the first reference layer. The memory cell also includes a second magnetic tunnel junction located on a second side of the magnetic polarizer layer and including a second reference layer having a second side facing the magnetic polarizer layer, a second free layer facing a first side of the second reference layer, and a second tunnel barrier layer located between the second free layer and the second reference layer.

A look-in type wide-field video display apparatus includes an ocular optical system (OC), a circular polarizing plate, and a display device (D) positioned in order from a user's eye side. The OC includes a first lens (L1) and a second lens (L2) positioned in order from the user's eye side, a surface on the user's eye side in the L1 is aspherical, a surface on a D side in the L1 is planar or approximately planar, and a reflective polarizing plate and a ¼-wavelength plate are laminated on the surface on the D side in this order from the user's eye side, a surface on the user's eye side in the L2 is aspherical, and is convex toward the user's eye side around an optical axis of the OC or is approximately planar, and a surface on the D side in the L2 is aspherical convex toward the D side.

The invention relates to the technical field of projection modules, and particularly discloses an LCOS laser projection module, which comprises a laser light source module, a laser speckle eliminator, a reflector, a diffuser, a collimating lens, a fly-eye lens, a relay lens, a first linear polarizer, a polarizing beam splitter, an LCOS chip, a second linear polarizer and a projection lens which are sequentially arranged along a light transmission path, the laser light source module is provided with a light source optical axis and is used for emitting light, and the light is projected by the projection lens after being modulated along a light transmission path to form a projection image. The light emitted by the laser light source has the advantages of narrow divergence angle, small light-emitting area and good light concentration and collimation, the resolution of a projected image can be improved, the projected image is bright in color and high in definition, and the requirements of simple structure and small size are met. Meanwhile, the laser speckle can be eliminated through the matching of the laser speckle eliminator and the diffusion sheet, and the projection image can meet the high contrast through the existence of the first linear polarizer and the second linear polarizer.

A reflective display panel including a first substrate, a second substrate, a liquid crystal layer, a pixel driving layer, a color filter layer, and a polarizer. The pixel driving layer is provided with a reflective layer overlapping the color filter layer. Absorbance of a first filter pattern of the color filter layer is greater than or equal to 0.25 and less than or equal to 0.9 in a wavelength range between 530 nm and 580 nm. Absorbance of a second filter pattern of the color filter layer is greater than or equal to 0.8 and less than or equal to 1.25 in a wavelength range between 630 nm and 680 nm. Absorbance of a third filter pattern of the color filter layer is greater than or equal to 0.95 and less than or equal to 1.3 in a wavelength range between 580 nm and 630 nm.

The invention discloses an ink-jet printing dry film defect detection system, and belongs to the technical field of OLED pixel groove dry film defect detection, the ink-jet printing dry film defect detection system comprises a shaping part, and a linear polarizer and a shaping lens are arranged in the shaping part; the shaping lens comprises a first lens and a second lens. The side face, facing the linear polarizer, of the first lens is flat and is vertically incident by the vertically polarized light. The side surface of the first lens back to the linear polaroid is concave in center and flat in periphery; the second lens protrudes outwards towards the center of the side face of the first lens and is flat in periphery. The side of the second lens back to the first lens is flat. The invention aims to solve the problems of the existing ink-jet printing OLED panel dry film defect detection method, the detection efficiency and the detection quality can be effectively improved, the cost is reduced, the introduction of new defects or the damage to a substrate is avoided, and the requirements of large-scale industrial production are met.

The invention discloses a rheology-birefringence combined in-situ testing device and method based on chopper rotation frequency signals, belongs to the technical field of optical testing, and aims to solve the technical problems that an existing Spark-FB device is low in measurement accuracy and limits application scenes. The laser emitter emits a light beam along a set angle (forming an angle of 45 degrees with the horizontal plane), the light beam is converted into linearly polarized light through the polarizer, and an optical signal is modulated through the rotating chopper; the modulated light beam penetrates through a polymer sample to which a shear flow field is applied by a commercial rheometer, and transmission light carrying optical anisotropy information of the sample sequentially passes through a 1 / 4 wave plate and a polarization analyzer, and is finally received by a photoelectric detector and transmitted to a lock-in amplifier for analysis. According to the invention, an independent datum reference signal is provided through the chopper, decoupling and combination of a commercial rheometer and a birefringence light path are realized, and synchronous and accurate in-situ measurement of rheological and optical properties of a high polymer material under a deformation condition can be realized.

The invention discloses a polarization sensitive type broadband absorber based on metal-medium stacking, and relates to the technical field of micro-nano photonic devices and infrared detection. The absorber sequentially comprises a bottom-layer high-loss metal reflecting layer, a multi-layer stacked composite dielectric cavity structure and a top-layer sub-wavelength metal grating from bottom to top, according to impedance matching and interference resonance theories, a broadband absorption substrate is constructed through a multi-layer film structure at the bottom, and light energy is converted into heat energy by utilizing the high loss characteristic of bottom layer metal; plasmon resonance is excited through the top metal grating, the coupling efficiency of TM polarized light is enhanced, and TE polarized light is cut off; the above structural design successfully realizes efficient broadband absorption and high polarization extinction ratio in an infrared band. The structure is simple in design, is compatible with a CMOS technology, and has excellent wide-angle stability. And meanwhile, polarization screening can be realized without an external polaroid, and miniaturization and integration of an infrared detection system are facilitated.

The invention provides a liquid crystal reflection line polaroid, a preparation method thereof and an optical system.The preparation method comprises the following steps that a substrate is placed in an evaporation cavity, and a plurality of first evaporation devices and a plurality of second evaporation devices are arranged in the evaporation cavity; preparing a photo-alignment material on the substrate to form a photo-alignment layer; evaporating a liquid crystal polymer precursor material on the substrate by adopting a plurality of first evaporation devices, and controlling the thickness of the formed liquid crystal polymer film by controlling the evaporation rate and / or the evaporation time of the plurality of first evaporation devices; evaporating an isotropic polymer precursor material on the liquid crystal polymer film by adopting a plurality of second evaporation devices, and controlling the thickness of the formed isotropic polymer film by controlling the evaporation rate and / or the evaporation time of the plurality of second evaporation devices; the preparation method is simple, and the thickness of each film layer can be accurately controlled.

The invention provides a laser processing device and system, and relates to the technical field of underwater laser processing. The laser processing device comprises a circular polarizer, a collimation assembly, a phase modulation element and a focusing lens. The circular polarizer, the collimation assembly, the phase modulation element and the focusing lens are sequentially arranged in the transmission direction of the laser beam; the circular polarizer is used for converting a to-be-processed light beam into circularly polarized light; the collimation assembly is used for collimating the circularly polarized light to obtain a collimated light beam; the phase modulation element is used for performing phase modulation on the collimated light beam to obtain a modulated light beam; the focusing lens is used for focusing the modulated light beam to obtain a target light beam, and the target light beam is used for machining an underwater to-be-machined object. In the design, the Rayleigh length of the target light beam is longer, and the target light beam has good water turbulence resistance, so that phase disturbance caused by water turbulence can be effectively reduced, the underwater laser processing quality is ensured, and the underwater laser processing efficiency is improved.

The invention provides a device and method for calibrating the wavelength of a spectrometer, and belongs to the technical field of optics, and the device comprises a light source module which is used for outputting wide-spectrum continuous light; the collimation module is used for outputting collimated light based on the wide-spectrum continuous light; the polarizer is used for generating linearly polarized light based on the collimated light; the rotating platform is used for placing a wave plate; the polarization analyzer is located in the light beam output direction of the wave plate; the focusing module is used for converging the light beams output by the polarization analyzer to the spectrograph; the spectrograph is used for detecting the energy of the input light beam so as to output corresponding optical data; the optical data comprises pixels and light intensity data of the input light beam; and a processor for determining a ratio of maximum response discrete light intensity data to minimum response discrete light intensity data based on the optical data, determining a peak center pixel position based on the ratio, and calibrating the spectrometer wavelength based on the pixel position. According to the invention, the technical problem of low accuracy of the wavelength calibration result of the existing spectrograph wavelength calibration method can be solved.

The invention discloses a multi-channel spectrum-controllable liquid crystal display system and a multi-channel spectrum-controllable liquid crystal display method. The system comprises a multi-channel backlight module, a liquid crystal display panel and a control module, the multi-channel backlight module is used for generating a backlight source comprising a plurality of spectrum sub-channels, the spectrum sub-channels cover different spectrum ranges, and the output intensity can be independently adjusted; the liquid crystal display panel comprises a liquid crystal layer, a first polaroid, a second polaroid, a red color filter, a green color filter and a blue color filter, wherein the red color filter, the green color filter and the blue color filter are arranged on the liquid crystal layer and used for conducting spectrum selection and polarization modulation on light from the multi-channel backlight module. The control module is used for cooperatively controlling the backlight output intensity of each spectrum sub-channel and the driving parameters of the liquid crystal display panel according to the display target containing the target spectrum distribution constraint on the premise of not changing the color filter structure and the pixel arrangement structure of the liquid crystal display panel; therefore, controllable reconstruction of the display spectrum output by the liquid crystal display panel is realized. An existing liquid crystal display panel structure does not need to be changed, the regulation and control freedom degree of a display system on the output spectrum can be improved, and a system-level solution is provided for achieving the display effect close to natural spectrum distribution.

The invention discloses an image enhancement method, electronic equipment, a storage medium and a program product, relates to the technical field of image processing, and is used for suppressing interference light in a scene by using intensity information of polarized images in multiple polarization directions to obtain a non-polarized image, so that the scene image is enhanced, and the authenticity of the scene is improved. The method comprises the following steps: collecting polarization images of a scene in a plurality of polarization directions, wherein pixels of the polarization images represent intensity information of incident light in the scene after the incident light is captured by a polaroid in the corresponding polarization direction; determining a non-polarized image of the scene according to the intensity information of the plurality of polarized images, the non-polarized image representing an image obtained by suppressing interference light in the scene, and the pixel of the non-polarized image representing the intensity information of non-polarized light; and determining an enhanced image of the scene according to the non-polarized image.

A magnetoresistive memory cell includes a magnetic polarizer layer having a hard magnetization along a hard magnetization direction, a first magnetic tunnel junction located on a first side of the magnetic polarizer layer and including a first reference layer having a first side facing the magnetic polarizer layer, a first free layer facing a second side of the first reference layer, and a first tunnel barrier layer located between the first free layer and the first reference layer. The memory cell also includes a second magnetic tunnel junction located on a second side of the magnetic polarizer layer and including a second reference layer having a second side facing the magnetic polarizer layer, a second free layer facing a first side of the second reference layer, and a second tunnel barrier layer located between the second free layer and the second reference layer.

The application discloses a kind of super large TV polaroid inspection feeding device, it is related to polaroid production technical field, it includes: adsorption component and connecting component, the adsorption component includes fixed tube, shell, support tube and suction cup, the fixed tube bottom end fixed connection shell upper surface, shell is provided with support tube, support tube fixed connection suction cup, and suction cup is provided with more than one, and rectangular array is set, forms suction cup matrix, the suction cup matrix includes first area, second area, third area, fourth area and fifth area;Polaroid is adsorbed by suction cup matrix, can disperse the force when polaroid is grabbed, polaroid is more uniform under stress, and the edge portion close to polaroid can be adsorbed and grabbed, prevent polaroid from sagging, cause polaroid to break when bending more than certain limit.

The invention discloses a vector vortex super lens for directional selective edge detection and an imaging system with the vector vortex super lens, and the vector vortex super lens comprises a substrate and a nano-structure unit on the substrate. The nano-structure units are arranged on the substrate according to specific phase distribution to form a nano-structure unit array; x-line polarized light carrying sample information passes through the vector vortex super lens to generate left-handed and right-handed emergent light, the two paths of emergent light are superposed to obtain an edge image carrying polarization information, and a vector edge detection function is realized. The vector vortex super lens provided by the invention has the edge extraction capability of dynamic adjustment as required, and can realize real-time directional edge detection only by rotating the polarization analyzer without other hardware modification or digital post-processing.

The invention discloses a dual-wavelength polarization tuning interference spectrum frequency discrimination device and a synchronous frequency locking method, and the method specifically comprises the steps: enabling a polarization Michelson interferometer to divide incident laser into two beams of linearly polarized light through a plurality of achromatic wave plates and a polarization splitting prism, and enabling the two beams of linearly polarized light to form dual-wavelength circularly polarized light for output after the two beams of linearly polarized light are reflected and combined; the output light is divided into two beams after passing through a light splitting module, and the two beams are respectively collected and processed into a four-quadrant synchronous phase-shifting interferogram by a polarization camera after passing through an achromatic lens, and the wavefront phase difference is calculated in real time; the other beam is compensated by the rotary linear polarizer and then is received by the detector; through the corresponding relation between the wavefront phase difference and the rotation angle, the rotation linear polarizer is driven in real time to carry out phase compensation, so that polarization tuning and frequency locking are realized; meanwhile, a piezoelectric mirror bracket control signal is obtained through calculation, and interferometer parallelism error correction is carried out. According to the invention, synchronous real-time monitoring and active feedback locking of dual-wavelength interference signals can be realized, and the system has the advantages of high tuning resolution and accurate data.

A structured light imaging device, a three-dimensional imaging method therefor, and a storage medium. The structured light imaging device comprises two polarizers which generate polarized light, a light-combining device, and a polarization analyzer, and can suppress high reflectivity and improve the accuracy and integrity of three-dimensional reconstruction. The three-dimensional imaging method comprises: using two rays of polarized light to perform structured light projection so as to obtain a first polarized structured light image and a second polarized structured light image of an imaged object, and separately using the images to perform three-dimensional reconstruction so as to obtain a first height image and a second height image; on the basis of the first polarized structured light image and the second polarized structured light image, determining whether there are multiple reflections on the imaged object surface corresponding to a pixel position, and if not, then determining a final height value of the pixel position on the basis of the height values of the first height image and the second height image at said pixel position, thereby reducing the impact which multiple reflections on the object surface have on reconstruction accuracy and integrity.

The invention relates to the technical field of lasers, and provides a double-gain-medium Q-switched laser and a constant-power pulse width adjusting method.The laser comprises a first pumping source, a second pumping source, an optical fiber beam combiner, a beam shaping system and a laser resonant cavity, the laser resonant cavity comprises a reflecting mirror, a first gain medium, a second gain medium, a polarization selector, a quarter-wave plate, a Q switch and an output mirror which are arranged in sequence; the first gain medium is used for absorbing first pumping light, the second gain medium is used for absorbing second pumping light, and the pumping power of the first pumping source and the pumping power of the second pumping source can be independently controlled. By changing the pumping power of the two pumping sources, real-time adjustment of the pulse width of the laser under the constant output power is achieved, the structure is compact, and control is easy and convenient.

The invention discloses a water quality turbidity intelligent monitoring method and system based on vision, and relates to the technical field of water environment monitoring and intelligent perception, an industrial camera and an event camera perform coaxial acquisition, and an electric control polaroid and an adjustable incident angle realize angle-polarization dual scanning and construct a polarization prior tensor. Adaptive standardization is carried out on the dazzle removal reference frame, a forward operator is established by combining polarization geometry and particle size mapping, and a latent image is obtained through physical consistency inversion of split iteration. The method comprises the following steps: extracting multi-scale features from RGB / HSV / Lab three branches and a cavity pyramid by using time domain polarization transformation and reliability selection, carrying out cross-space fusion based on particle size spectrum estimation and spatial gating, outputting a turbidity value, and synchronously giving a particle size spectrum, depolarization confidence and flicker intensity. And the internet-of-things execution subsystem performs hierarchical linkage according to threshold values and performs online self-calibration.

The invention relates to a device and method for measuring the scratch depth of an optical element through polarization imaging, and the device comprises an illumination module, a polarization module, an optical element bearing module, an imaging module, and an image collection module. The polarization module comprises a polarizer for polarizing a light path and a polarization analyzer for analyzing the polarization of the light path; the optical element bearing module is arranged between the polarizer and the analyzer; the imaging module is arranged on the polarization analyzer and is used for optical imaging; the image acquisition module acquires an image of the imaging module. The method for measuring the scratch depth of the optical element comprises six steps of opening a light source, polarizing, transmitting an element to be measured, analyzing polarization, calculating a polarized image and calculating the scratch depth. The time-sharing polarization imaging system is used for firstly measuring the phase delay amount caused by the scratch, then the scratch depth is measured in combination with the mathematical relationship between the scratch depth and the phase delay amount, the scratch depth can be automatically measured, the detection speed is high, the precision is high, and the scratch position and the scratch depth can be detected.

The application discloses a disk medium high-energy ultra-short pulse laser regenerative amplifier based on CPA technology, comprising: a femtosecond laser seed light source for providing femtosecond seed light; a chirped Bragg fiber grating for expanding the femtosecond seed light into nanosecond laser pulses; an optical coupling input and output device for coupling input of the nanosecond laser pulses and coupling output of the nanosecond laser pulses after amplification processing; a regenerative amplification laser cavity for regenerative amplification processing of the coupled-in nanosecond laser pulses; the optical coupling input and output device comprises a fiber coupling collimation module, an optical isolator, a first 1 / 2 wave plate and a thin film polarizer; the regenerative amplification laser cavity comprises a Pockels cell, a second 1 / 2 wave plate, a first reflection module, a second reflection module, a first telescope module, a second telescope module, a first disk gain medium, a second disk gain medium and a third reflection module; the regenerative amplifier can realize high-repetition-frequency and high-pulse-energy laser pulse output.

The invention relates to the technical field of gratings, and discloses a polarization holographic two-dimensional grating and a preparation method thereof, an optical waveguide and a two-dimensional pupil expansion method, and the method comprises the steps: forming a light-operated orientation layer film on a substrate; exposing the light-operated orientation layer film to obtain an oriented light-operated orientation layer; coating the photo-alignment layer with a liquid crystal polymer solution mixed with a chiral agent and an initiator to form a liquid crystal polymer film; and curing the liquid crystal polymer film to obtain the polarization holographic two-dimensional grating. Therefore, a two-dimensional grating can be directly prepared without depending on multi-area grating combination to realize bidirectional expansion of light beams, the view field range is expanded, the technological process is simplified, the manufacturing complexity and the preparation cost are reduced, and meanwhile, the consistency and high performance of mass production are guaranteed; in addition, the integrated design of the two-dimensional grating can avoid the problem of uneven brightness caused by traditional multi-assembly splicing, the overall brightness uniformity and the imaging display effect are effectively improved, and a low-cost and high-performance implementation path is provided for optical waveguide two-dimensional pupil expansion.