Abstract: A radar system to detect and track objects in three dimensions. The radar system including antennae, transmit, receive and processing electronics is all in a small, lightweight, low-cost, highly integrated package. The radar system uses a wide azimuth, narrow elevation radar pattern to detect objects and a Wi-Fi radio to communicate to one or more receiving and display units. One application may include mounting the radar system in an existing radome on an aircraft to detect and avoid objects during ground operations. Objects may include other moving aircraft, ground vehicles, buildings or other structures that may be in the area. The system may transmit information to both pilot and ground crew.

Abstract: Methods and systems for storing and processing a plurality of fractions of imaging data thereby minimizing the amount of cache memory necessary while controlling data loss and the resulting image quality.

Abstract: An information processing device includes processing circuitry. The processing circuitry obtain target information that indicates at least one of a distance to a target object or a position of the target object. The processing circuitry generate, based on the target information, map information of a space including a plurality of areas, the map information indicating presence or absence of the target object in a first area included in the plurality of areas, and a detailed position of the target object in the first area.

Abstract: A vehicle with a LIDAR system, the LIDAR system having an emitter, receivers and a controller. The emitter emitting a Fourier series sum signal with each frequency given a substantially randomized phase. The receivers include a first receiver receiving a portion of the signal proximate to the LIDAR system; and a second receiver receiving a portion of a reflected signal, the reflected signal being a portion of the series sum signal after being reflected off of an object. The controller is coupled to the emitter and the receivers. The controller being configured to de-convolve the portion of the reflected signal received by the second receiver with the portion of the series sum signal received by the first receiver, and to estimate a distance to the object dependent upon an identified time delay between the portion of the reflected signal and the portion of the series sum signal.

Abstract: A LiDAR system and method includes a pulse modulation circuit and an amplitude modulation circuit for applying pulse modulation and amplitude modulation to a continuous signal to generate a plurality of amplitude-modulated pulses of the continuous signal. An optical modulation circuit applies the amplitude-modulated pulses of the continuous signal to an optical signal to generate a pulse amplitude-modulated (PAM) optical signal. Optical transmission elements transmit the PAM optical signal into a region, and optical receiving elements receive reflected optical signals from the region. Receive signal processing circuitry uses quadrature detection to process the reflected optical signals.

Abstract: A lidar comprises a first laser source configured to generate a first laser output at a first frequency and a second laser source configured to generate a second laser output at a second frequency, wherein the first frequency is different from the second frequency. A combining coupler combines the first laser output and the second laser output into a combined output. The combined output is carried by an optical fiber to a fiber tip where the combined output is transmitted as a transmit signal toward a target. A reflected portion of the transmit signal reflected back from a point on the target is received. A mixing coupler mixes the received reflected portion of the transmit signal with a second portion of the combined output and outputs a mixed signal. A wavelength filter separates the mixed signal into a first mixed signal corresponding to the first frequency of the first laser source and a second mixed signal corresponding to the second frequency of the second laser source.

Abstract: A three-dimensional (3D) coordinate measurement device combines tracker and scanner functionality. The tracker function is configured to send light to a retroreflector and determine distance to the retroreflector based on the reflected light. The tracker is also configured to track the retroreflector as it moves, and to determine 3D coordinates of the retroreflector. The scanner is configured to send a beam of light to a point on an object surface and to determine 3D coordinate of the point. In addition, the scanner is configured to adjustably focus the beam of light.

Abstract: A method for measuring and registering 3D coordinates has a 3D scanner measure a first collection of 3D coordinates of points from a first registration position. A 2D scanner collects horizontal 2D scan sets as 3D measuring device moves from first to second registration positions. A processor determines first and second translation values and a first rotation value based on collected 2D scan sets. 3D scanner measures a second collection of 3D coordinates of points from second registration position. Processor adjusts second collection of points relative to first collection of points based at least in part on first and second translation values and first rotation value. Processor identifies a correspondence among registration targets in first and second collection of 3D coordinates, and uses this correspondence to further adjust the relative position and orientation of first and second collection of 3D coordinates.

Abstract: The invention relates to a depth sensor module and depth sensing method. The depth sensor module and method is adapted to include a light detector part and emitting part with a least two light sources spatially offset in the direction of the triangulation baseline. In some of the embodiments, the pixel field of the image sensor in the light detector part consists of time-of-flight pixels. Depth measurements derived by triangulation can be used to calibrate depth maps generated by the time-of-flight measurements.

Abstract: An anti-theft system that is capable of being tracked by and automatically notifies the appropriate authorities when leaving a designated geo-fence area. The anti-theft system includes a storage device having two opaque housing portions that can be secured together along their respective peripheries, providing a cavity. The housing portions are opaque except for a cutout in one of the housing portions. The cavity provides a GPS and a mounting display, wherein the mounting display secure a valuable so that it is partially visible through the cutout, while the GPS is not so visible. The GPS tracks and notifies according to predetermined criteria.

Abstract: The invention discloses an antenna assembly comprising one or more sensors, possibly a fish-eye camera which produces images of the sky above the antenna, said images being processed to identify open sky and occulted sky areas, said identification being used to generate an antenna gain pattern shape wherein null zones are placed on the occulted sky areas, so as to eliminate the GNSS signals which are affected by multi-path reflection. The antenna assembly of the invention may be used with any GNSS receiver of the prior art. No specific data on the location of the receiver or its orientation is needed to perform the method of the invention, while in some embodiments, it may be useful to send some information on the number of satellites in view in the open sky.

Abstract: Embodiments of the present disclosure relate to a magnetic locator for a GNSS device. The magnetic locator includes a magnetic field sensor configured to detect a magnetic field adjacent the magnetic locator; a controller coupled to the magnetic field sensor and configured to receive from the magnetic field sensor measurement data based on the magnetic field and calculate sensor data based on the received measurement data; a communication interface coupled to the controller and adaptable to transmit sensor data received from the controller to the GNSS device; a connector adaptable to connect the magnetic locator to a GNSS antenna of the GNSS device; and a housing.

Abstract: The present invention relates to a high-precision real-time satellite positioning apparatus and a method thereof. The present invention has technical features as follows: the apparatus includes a polygonal receiver array formed by a plurality of single-point satellite positioning receivers; an antenna phase center of each single point satellite positioning receiver is disposed at each vertex and center point of the polygonal receiver array; each single-point satellite positioning receiver includes an MCU and a receiver connected with the MCU; and all MCUs are connected in parallel and jointly connected to a processor module.

Abstract: The present invention relates to a Marinelli beaker correction container for stable radionuclide analysis, the Marinelli beaker correction container including: a container body having a diameter corresponding to a detector mounting part provided at a lower part of the Marinelli beaker, and being insertedly mounted to the detector mounting part; a detector coupling groove being formed at a lower part of the container body with an inner diameter corresponding to a diameter of the spectroscopy system detector, and allowing the Marinelli beaker to be mounted on the spectroscopy system detector by insertedly mounting the spectroscopy system detector to the detector coupling groove; and a ventilation hole being vertically formed through a center of a top surface of the container body, and allowing the container body to be smoothly mounted or dismounted due to air ventilation when the container body is mounted to or dismounted from the detector mounting part.

Abstract: A scintillator for imaging using X-rays or gamma rays or charged particles, includes a network of glass capillaries with an inner diameter no greater than 500 micrometres. The capillaries are filled with a polymer material made up of at least (i) a monomer selected from the group comprising vinyltoluene, styrene and vinylxylene and the isomers thereof, (ii) a cross-linking agent made up of a divinylbenzene or a dimethacrylate having a central chain which includes 1 to 12 carbon atoms, and (iii) triphenylbismuth. The cross-linking agent is provided to make up 10 wt % to 60% wt of the mixture thereof with the monomer, and the triphenylbismuth makes up at least 5 wt %. The cross-linking agent is provided in a ratio of 0.75 to 2.25 times the weight content of the triphenylbismuth.

Abstract: A technique facilitates use of radiation sampling techniques in subterranean formation environments or other environments. A radiation detector may be constructed utilize a scintillator package having a scintillating crystal. The scintillating crystal is combined with a reflector positioned to reflect light otherwise leaving a surface of the scintillating crystal. The reflector incorporates nano materials, e.g. nano particles or nano fibers, arranged to provide highly reflective properties. By way of example, the nano materials may be fabricated in a separate layer combined with the scintillating crystal or applied directly onto a surface of the scintillating crystal.

Abstract: A radiation imaging apparatus, comprising a sensor array and a controller, wherein the controller shifts to a non-capturing mode upon receiving an instruction representing a suspension of radiographic imaging, and shifts to a capturing mode upon receiving an instruction representing a start of radiographic imaging, and the controller performs, in the capturing mode, one of movie capturing and continuous capturing in which an operation of driving the sensor array in response to one radiation irradiation for the sensor array and acquiring image data of one frame from the sensor array is repetitively executed, and, in the non-capturing mode, drives the sensor array to suppress lowering of a temperature of the sensor array in the non-capturing mode from the temperature of the sensor array in the capturing mode.

Abstract: A spectroscopic gamma and neutron detecting device includes a scintillation detector that detects gamma and thermal neutron radiation, the scintillation detector including signal detection and amplification electronics, and a stabilization module configured to measure a pulse height spectrum of neutron radiation, determine a thermal neutron peak position in the neutron pulse height spectrum originating from cosmic ray background radiation, monitor the thermal neutron peak position in the neutron pulse height spectrum during operation of the spectroscopic gamma and neutron detecting device, and adjust the signal detection and amplification electronics based on the thermal neutron peak position in the neutron pulse height spectrum, thereby stabilizing the spectroscopic gamma and neutron detecting device.

Abstract: A neutron detector module compriging a distribution of proportional counters positioned in in a defined array. Each of the proportional counters includes a supply of a neutron sensitive gas for reacting with neutrons, and this reaction generates ionizing reaction products. The proportional counters include a multitude of tubes, and each of the tubes has a diameter between 0.50 inch and 1.00 inch. The neutron detector module comprises further a multitude of electrical conductors; and each of the conductors is positioned in one of the proportional counters, and the ionizing reaction products generate electric current pulses in the electrical conductors.

Abstract: A method for calibrating an ionising radiation detector, with the aim of determining a correction factor in order to establish an amplitude-energy correspondence The invention first relates to a method for calibrating a device for detecting ionising radiation, the detector comprising a semiconductor or scintillator detection material capable of generating a signal S of amplitude A upon interaction between ionising radiation and the detection material, the method including the determination of a weighting factor of amplitude A.

Abstract: This invention provides a system apparatus and method for ship-towed deployment of a non-linear volumetric array of hydrophones, allowing line-intersect or line-transect sampling of marine mammal populations through passive acoustic monitoring, enabling unambiguous real-time three-dimensional localization of single sounds received through a low-cost, modular, robust, stable, small, light, neutrally to slightly negatively buoyant volumetric array having low self-noise and low flow noise, that avoids putting high tension on the tow cable and that is compatible with standard hydrophones, instrumentation, cabling, and analytical software.

Abstract: A method and source element for generating seismic waves in water. The source element includes a housing having an opening; an acoustic piston closing the opening; an actuating mechanism located inside the housing and configured to actuate the acoustic piston; and a decoupling mechanism interposed between the acoustic piston and the actuating mechanism. The decoupling mechanism allows the acoustic piston to move substantially independent of the actuating mechanism for a first frequency range.

Abstract: A fracture model for a hydraulic fracture in a wellbore can be updated and calibrated. Information about a microseismic event can be received from a sensor that is monitoring a subterranean formation. The information can be received subsequent to a fracking fluid being introduced into the formation. An observed geometry of a hydraulic fracture can be determined based on the information and a predicted geometry of the fracture can be determined based on properties of the fracking fluid and a fracture model. The fracture model can be updated using the information about the microseismic event where it is determined that an uncertainty value of the observed geometry does not exceed a pre-set maximum. The uncertainty value can be based on the predicted geometry of the hydraulic fracture.

Abstract: Device and method for calculating a set of surface wave dispersion curves. The method includes receiving seismic data recorded with seismic sensors over an area to be surveyed; selecting region units that cover the area to be surveyed; gathering traces for the region units; processing in a computing device the traces to obtain a set of candidate measurements for each region unit; teaching a decision algorithm based on a first subset of the set of candidate measurements; and calculating the set of surface wave dispersion curves by running the decision algorithm on a second subset of the set of candidate measurements.

Abstract: Seismic node systems can be configured for acquiring seismic sensor data with an array of seismic receivers or nodes deployable in a survey area, each receiver or node having a seismic sensor for acquiring the seismic sensor data, a clock, a controller and local memory. The seismic sensor can data characterize a seismic wavefield proximate the seismic receivers in the survey area. Quality control data can be generated based on the seismic sensor data and associated timing information provided by the respective clock, and incorporated into a seismic data flow for recording in the local memory.

Abstract: Disclosed are methods and systems for performing marine geophysical surveys that utilize a streamer having variable stiffness. An embodiment discloses a sensor streamer comprising: an outer surface; tension members within the outer surface extending along a length of the sensor streamer; spacers disposed within the outer surface along the length of the sensor streamer; a geophysical sensor disposed in an interior of one of the spacers; and an actuator assembly configured to apply tension to the tension members.

Abstract: Systems and methods for downhole signal filtering. A method for downhole signal filtering may comprise defining outliers as isolated values; providing thresholds; determining the outliers from a buffer; computing a difference in slowness between adjacent pairs of values; comparing the adjacent pairs of values to other values in a same window; determining if the adjacent pairs of values vary more than the threshold; assigning a 2D flag array a value of 0 if the adjacent pairs of values vary more than the threshold; and computing a 75% percentile distribution for each adjacent pair of values to determine if each adjacent pair of values are the outliers.

Abstract: An apparatus for measuring resistivity in a borehole includes first and second modules configured to be conveyed through the borehole and a transmitter connected to the first module, the transmitter transmitting a transmitter signal that causes a field signal to be created in a formation surrounding the borehole. The apparatus also includes a receiver connected to the second module configured to sense the field signal, a reflection generator and a delay determination circuit that includes a pulse generator and a timer. The apparatus also includes a communication link coupling the delay determination circuit and the reflection generator. The delay determination circuit causes a first pulse to be transmitted to the reflection generator and determines an indication that is related to the time until a reflection is received back from the reflection generator.

Abstract: A system for magnetic detection includes a magneto-optical defect center material including at least one magneto-optical defect center that emits an optical signal when excited by an excitation light; a radio frequency (RF) exciter system configured to provide RF excitation to the magneto-optical defect center material; an optical light source configured to direct the excitation light to the magneto-optical defect center material; and an optical detector configured to receive the optical signal emitted by the magneto-optical defect center material.

Abstract: Methods and systems for reducing shoulder effect are disclosed. Some method embodiments include obtaining resistivity logging data corresponding to a resistivity logging tool's position in a formation position; performing an anisotropic single-layer inversion on the resistivity logging data to determine a horizontal resistivity, a vertical resistivity, and a dip angle of the formation at the tool's position; detecting a location of a boundary of the formation and performing a vertical multi-layer inversion based on the resistivity logging data in a window around said location, if a residual error for the anisotropic inversion exceeds a threshold; and displaying a log of at least one inversion parameter from the anisotropic inversion or the vertical inversion based on said residual error.

Abstract: A nuclear magnetic resonance apparatus for estimating properties of an earth formation includes a carrier configured to be deployed in a borehole in the earth formation and at least one transmitting assembly disposed in the carrier and configured to generate an oscillating magnetic field in a volume of interest within the earth formation. The apparatus also includes at least one receiving assembly disposed in the carrier and configured to detect a nuclear magnetic resonance (NMR) signal originating in the volume of interest. In this apparatus, the receiving assembly includes at least a first longitudinal region with a loop coil and a butterfly coil, the loop coil central axis being located over a region of the magnet assembly where a static magnetic field is predominantly along an azimuthal direction to the carrier and the butterfly coil being at least partially overlapped with the loop coil to reduce mutual coupling.

Abstract: The present disclosure relates to a technical field of a security detection device, and particularly, to a security detection system, comprising one or more detection devices, wherein the detection device comprises a first ray emitter, a ray receiver, and a movable frame, wherein the first ray emitter comprises a first ray source for generating first detection rays and is provided at a bottom portion of the movable frame, so that the first detection rays can penetrate through a detected object from a bottom of the detected object; the ray receiver comprises a ray detector provided on the movable frame, for correspondingly receiving the first detection rays having penetrated through the detected object; and the movable frame is movable in a direction in which the first ray emitter and the ray receiver are capable of moving through a detection region for the detected object.

Abstract: A system includes a plurality of magnetometers that are each configured to generate a vector measurement of a magnetic field. The system also includes a central processing unit that is communicatively coupled to each of the magnetometers. The central processing unit is configured to receive from each of the plurality of magnetometers the respective vector measurement of the magnetic field. The central processing unit is further configured to compare each of the vector measurements to determine differences in the vector measurements and to determine, based on the differences in the vector measurements, that a magnetic object is near the plurality of magnetometers.

Abstract: A system includes a data processing system including a processor operatively coupled to a memory. The processor is configured to receive a first dataset indicative of spectral information regarding photons received from a first detector of a formation density tool. The processor is configured to receive a second dataset indicative of a total count rate of photons from a second detector of the formation density tool. The processor is configured to determine physical characteristics of a geological formation based on the spectral information and the total count rate. The processor is configured to display the physical characteristics of the geological formation in a display.

Abstract: A radiation logging tool is provided that includes a scintillator detector for use on a wellbore tool string to characterize earth formations. The scintillator detector has a shutter to allow for the collection of data differentiating between incident radiation, such as backscatter signal, and system noise, such as dark current, vibration noise, electronics thermal noise, and electrostatic noise. The radiation logging tool provides for a method of calibrating and measuring incident radiation by the removal of system noise. The shutter is positioned between the photosensor and scintillation member of the scintillator detector, and is able to switch between open and closed states while the scintillation detector is deployed. Measurements of signal noise can be used to calibrate the sampling signal of incident radiation on the scintillator detector.

Abstract: A system and method of predicting the impact of forecasted weather, environmental, and geologic events (that include one or more weather/environmental/geologic conditions) by determining a recurrence interval of each past condition in each location, determining the correlation between the past condition and the observable impact of the past event, calculating a predicted observable impact of each past event, calculating a predicted impact of each past event recurring by multiplying the predicted observable impact of the past event by the recurrence interval of the past condition, grouping the past events into a plurality of groups based on the predicted impact of the past condition recurring, determining a threshold for each group, receiving forecasted conditions, and determining the predicted impact of the forecasted conditions by comparing the forecasted conditions with the thresholds.

Abstract: A package of a heat-bent polarizing sheet for producing an injection-molded polarizing lens, in which a laminated polarizing sheet prepared by bonding a transparent plastic sheet onto each of two sides of a polarizing film formed of a uniaxially stretched polyvinyl alcohol resin film with an adhesive layer interposed therebetween is used as an individual laminated polarizing sheet that has an original plate shape for individual lenses, the individual laminated polarizing sheet is heat-bent to form a spherical aspherical surface under heating to prepare a heat-bent polarizing sheet, the heat-bent polarizing sheet is set onto a mold, and a transparent resin for lenses is injection-molded onto a concave surface of the heat-bent polarizing sheet. The heat-bent polarizing sheet is a heat-bent polarizing sheet that is stored or transported in a dampproof package and can be used in injection molding without performing preliminary drying as a pretreatment of injection molding.

Abstract: The present invention relates to a low refractive layer and an anti-reflective film comprising the same. The low refractive layer can exhibit excellent optical properties such as a low reflectance and a high light transmittance, and excellent mechanical properties such as high wear resistance and scratch resistance at the same time, without adversely affecting the color of the polymer resin forming the low refractive layer. In particular, due to the excellent alkali resistance, the low refractive layer can maintain excellent physical properties even after alkali treatment. Therefore, when introducing a low refractive layer to the display device, it is expected that the production process can be simplified and further the production rate and the productivity can significantly increase.

Abstract: An antireflection film includes an uneven structure layer that has an uneven structure and has an alumina hydrate as a main component, and an intermediate layer that is disposed between the uneven structure layer and a substrate. The uneven structure layer has a spatial frequency peak value of the uneven structure of 8.5 or greater and has a film thickness of 200-250 nm, and the intermediate layer comprises a plurality of layers including at least a first layer, a second layer, a third layer, and a fourth layer.

Abstract: The present disclosure provides a lens. The lens includes at least two layers of glass wafers, each glass wafer is provided with a lens array including a plurality of lens units, glue is provided around a periphery of each of the lens unit, the lens units of two adjacent layers of glass wafers are correspondingly arranged one to one, and are adhered via the glue, the glass wafer is further provided with an air hole. In the lens provided by the present disclosure, through providing an air hole on the glass wafer of the lens, so that when two adjacent glass wafers are stacked via the glue, air in the sealed space can be exhausted through the air hole, and through filling glue in the air hole of the outermost layer of glass wafer, the sealing effect is achieved, which can avoid packaging defects, and improve product yield.

Abstract: Provided are reflective thin film constructions including a reduced number of layers, which provides for increased solar-weighted hemispherical reflectance and durability. Reflective films include those comprising an ultraviolet absorbing abrasion resistant coating over a metal layer. Also provided are ultraviolet absorbing abrasion resistant coatings and methods for optimizing the ultraviolet absorption of an abrasion resistant coating. Reflective films disclosed herein are useful for solar reflecting, solar collecting, and solar concentrating applications, such as for the generation of electrical power.

Abstract: It is provided an assembly including an optical material layer composed of a metal oxide, an underlying layer provided over the optical material layer and composed of a metal or a metal silicide, and a resin layer provided over the underlying layer. A mold including a design pattern corresponding with the fine pattern to the resin layer of the assembly to transcript the design pattern to the resin layer. The resin layer and underlying layer are etched to form an opening in the resin layer and underlying layer to expose the optical material layer through the opening. The optical material layer is etched using the underlying layer as a mask to form the fine pattern in the optical material layer.

Abstract: A laminated diffractive optical element includes a first resin layer having a first lattice shape and a second resin layer having a second lattice shape. The first resin layer and the second resin layer are laminated in this order on a first substrate so that the lattice shapes oppose each other. The first resin layer contains a resin and transparent conductive particles. The transparent conductive particles have an average particle size of 1 nm to 100 nm. A ratio of a polymer of an energy curable resin raw material having a long diameter of 1 ?m to 10 ?m in the first resin layer is 70 pieces/mm3 or less.

Abstract: There is provided an optical filter whose transmitting characteristics for visible light are favorably maintained and at the same time, whose blocking characteristics for near-infrared light, in particular, with a large incident angle deteriorates less. The optical filter includes an absorption layer and a reflection layer, and satisfies the requirements: in a spectral transmittance curve for a 0° incident angle, an average transmittance for 430 to 620 nm wavelength light is 65% or more, and a wavelength exhibiting a 50% transmittance is in a 600 to 700 nm wavelength; in a 615 to 725 nm wavelength, an average value of absolute values of differences in transmittance between the spectral transmittance curve for the 0° incident angle and 30° incident angle is 8%/nm or less; and in a spectral transmittance curve for a 60° incident angle, the maximum transmittance for 730 to 1000 nm wavelength light is 15% or less.

Abstract: An infrared optical filter may include a glass ceramic layer, a multilayer oxide thin film formed on a first surface of the glass ceramic layer, and a low reflectivity coating layer formed on a second surface of the glass ceramic layer.

Abstract: The present invention relates to a polarized light emissive device and a method for its manufacture comprising a plural of fluorescent semiconductor quantum rods, and to a preparation thereof. The invention further relates to a use of the polarized light emissive device in optical devices, and to an optical device comprising the polarized light emissive device.

Abstract: A retardation film including a stacked structure including 2m tilt +C plates with m as a positive integer and a +A plate disposed over the 2m tilt +C plates. Each of the 2m tilt +C plates includes a liquid crystal layer. The liquid crystal layer includes a material satisfying nx?ny<nz, wherein a longitudinal direction axis of the retardation film is an X-axis, a width direction axis of the retardation film substantially perpendicular to the X-axis is a Y-axis, a thickness direction axis of the retardation film substantially perpendicular to the X-axis and the Y-axis is a Z-axis, and refractive indexes of the X-axis, the Y-axis, and the Z-axis respectively correspond to nx, ny, and nz.

Abstract: Provided is a method for an optical film which elongates by forming a plurality of sheet pieces by cutting a pre-processing optical film in a width direction of the pre-processing optical film, aligning the plurality of sheet pieces in such a manner that first end portions parallel to the longitudinal direction of the pre-processing optical film are opposite to each other, and connecting end portions of the plurality of sheet pieces to each other.

Abstract: A composite film including a first polarizing film, at least one second polarizing film, and at least one first phase compensation film is provided. The first polarizing film has a first transmission axis. Each second polarizing film has a second transmission axis parallel to the first transmission axis. The at least one first phase compensation film is disposed between the first polarizing film and the at least one second polarizing film. Each first phase compensation film has a first optical axis. An orthographic projection of the first optical axis on the first polarizing film is parallel to an axial direction of the first transmission axis, and a first included angle between the first optical axis and the first polarizing film is greater than 0 degrees and less than 90 degrees. A display device is also provided.

Abstract: Various implementations of the invention, improve an optical efficiency of an optical path comprising a polarizing beam splitter and a quarter wave plate. In some implementations of the invention, where an additional optical component introduces a phase retardance into the optical path, the quarter wave plate may be adjusted away from its nominal orientation relative to the optical path to improve an optical efficiency of the optical path.