111 results about "Selective reflection" patented technology

The invention relates to a polarization spectrometer, in particular to a pitch-adjustable polarization spectrometer based on cholesteric cellulose chiral liquid crystal. The polarization spectrometer is prepared by adopting the following method: step 1, regulating and controlling the screw pitch of cholesteric cellulose chiral liquid crystal; step 2, preparing a flexible PDMS film; step 3, preparing a patterned PDMS through hole film; 4, treating the surface of the glass sheet; step 5, filling cholesteric cellulose chiral liquid crystals; and step 6, orienting the cholesteric cellulose chiral liquid crystal to obtain the pitch-adjustable polarization spectrometer with the film-shaped patterned cholesteric cellulose chiral liquid crystal. The problems that a traditional small-molecule liquid crystal chiral agent is difficult to regulate and control the screw pitch of the cholesteric phase cellulose chiral liquid crystal and easy to agglomerate can be solved, and simple preparation of the screw pitch-adjustable cholesteric phase cellulose chiral liquid crystal is achieved; and meanwhile, transmission of right-handed circularly polarized light and selective reflection of left-handed circularly polarized light are realized by utilizing the patterned cholesteric cellulose chiral liquid crystal.

The invention discloses a laminated solar cell structure containing a selective reflection / light transmission optical thin film. The laminated solar cell structure comprises a wide-band-gap solar cell, the selective reflection / light transmission optical thin film and a narrow-band-gap solar cell which are sequentially arranged in the light incidence direction. The selective reflecting / light-transmitting optical thin film is at least used for 1) reflecting high-energy photons to be absorbed and utilized by the wide-band-gap solar cell; and 2) low-energy photons are transmitted to be absorbed and utilized by a narrow-band-gap solar cell. According to the invention, the selective reflection / light transmission optical thin film is used to fully reflect the transmitted high-energy photons to the wide-band-gap top cell without influencing the transmission of low-energy photons, so that the absorption and conversion of the wide-band-gap top cell to the high-energy photons can be improved, the photoelectric conversion efficiency of the laminated cell can be effectively improved, and the laminated cell has a good application prospect.

The present invention provides a composite pigment, which comprises a first cholesteric liquid crystal pigment and a second cholesteric liquid crystal pigment. The above-mentioned first cholesteric liquid crystal pigment is a pigment having a center wavelength of a selective reflection band in the range of 400 nm or more and 800 nm or less and a selective reflection bandwidth of 150 nm or less. The above-mentioned second cholesteric liquid crystal pigment is a pigment having a selective reflection bandwidth of 200 nm or more in the range of 400 nm or more and 800 nm or less. At least a part of the selective reflection band of the above-mentioned first cholesteric liquid crystal pigment overlaps with the selective reflection band of the above-mentioned second cholesteric liquid crystal pigment. With respect to the total amount of the above-mentioned first cholesteric liquid crystal pigment and the above-mentioned second cholesteric liquid crystal pigment, the content of the above-mentioned first cholesteric liquid crystal pigment is more than 0% by weight and 30% by weight or less.

The invention relates to the technical field of functional polymer composite materials, in particular to an intermediate film for laminated glass based on color generation of a photonic crystal structure and a preparation method of the intermediate film. The intermediate film comprises a thermoplastic resin matrix and a three-dimensional photonic crystal structure region dispersed in the thermoplastic resin matrix, wherein the three-dimensional photonic crystal structure region is formed by self-assembly of monodisperse microspheres, and the central wavelength of a photonic forbidden band of the region is located in a visible light range. According to the invention, a three-dimensional photonic crystal structure is constructed in the intermediate film, and structural color generation is generated by utilizing selective reflection of the photonic band gap effect on visible light with a specific wavelength. According to the laminated glass, the color is generated by interference of light instead of absorption of chemical pigments, so that the color can be continuously and regularly changed along with the change of an observation angle or an incident light angle, the dynamic and changing visual aesthetic feeling is given to the laminated glass, and the higher requirements of the fields of modern buildings, automobiles and the like on dynamic aesthetics and personalized appearance are met.

The invention provides a head-up display system and a vehicle, and relates to the technical field of display. The image generation device emits image light, and the image light is reflected to the projection surface through the reflection assembly; the wavelength selection reflecting film is located on the reflecting surface of the reflecting assembly, realizes the function of selective reflection of different wavebands, is set to reflect at least part of image light, and ensures that the image light is not influenced by the arrangement of the wavelength selection reflecting film; when external interference light enters the head-up display system along a backlight path of image light, the external interference light enters the wavelength selection reflecting film before entering the image generation device, and the wavelength selection reflecting film only reflects the interference light with the same wave band as the image light. Therefore, most of the interference light with the wave band different from that of the image light is absorbed and filtered out, the interference light cannot enter the image generating device, the influence of the backward flowing problem of the external interference light on the image generating device is remarkably reduced, the service life of the image generating device is prolonged, and the imaging quality of the image generating device is improved.

Provided is a circularly polarized light emitting display device including: a reflecting electrode; a light emitting element layer; a circular polarization layer; and a selective reflection layer provided between the light emitting element layer and the circular polarization layer, at least part of which is configured to have the same or opposite direction of rotation as or to the circular polarization layer. The circularly polarized light emitting display device. The circularly polarized light emitting display device can completely prevent reflection of external incident light and prevent a decrease in the light emission efficiency of an OLED.

The present invention provides a composite pigment, which comprises a first cholesteric liquid crystal pigment and a second cholesteric liquid crystal pigment. The above-mentioned first cholesteric liquid crystal pigment is a pigment having a central wavelength of a selective reflection band in the range of 400 nm or more and 800 nm or less and a selective reflection bandwidth of 150 nm or less. The above-mentioned second cholesteric liquid crystal pigment is a pigment having a selective reflection bandwidth of 200 nm or more in the range of 400 nm or more and 800 nm or less. At least a part of the selective reflection band of the above-mentioned first cholesteric liquid crystal pigment overlaps with the selective reflection band of the above-mentioned second cholesteric liquid crystal pigment. With respect to the total amount of the above-mentioned first cholesteric liquid crystal pigment and the above-mentioned second cholesteric liquid crystal pigment, the content of the above-mentioned first cholesteric liquid crystal pigment is more than 30% by weight and 80% by weight or less.

The present invention relates to a device for calibrating a radar sensor (10) installed in a vehicle (12), wherein the device includes a reflective element which is designed and aligned in such a way that it reflects radar rays (20) of a radar sensor (10) installed in a target pose at least partially back to the radar sensor (10). According to the invention, the reflection element is implemented as an angle-selective reflection element.

The invention discloses a fluorescent liquid crystal oligomer with selective reflection characteristic and a preparation method thereof, a chiral liquid crystal monomer, a fluorescent monomer and polymethyl hydrogen-containing siloxane are subjected to graft copolymerization to construct a linear side chain liquid crystal oligomer with full spectrum selective reflection, and the structural formula is shown in formula I; under a bright field condition, the linear side chain liquid crystal oligomer can realize full-spectrum selective reflection in a heating process; under the dark field condition, the linear side chain liquid crystal oligomer can realize the blue fluorescence characteristic. According to the linear side chain liquid crystal oligomer prepared by the method, multi-mode optical characteristics with selective reflection and fluorescence characteristics are constructed from the molecular scale, the linear side chain liquid crystal oligomer has wide application prospects in the optical field, the preparation process is safe to operate, and reaction conditions are mild. # imgabs0 #

The invention discloses a multi-wavelength composite light spot laser treatment device, which belongs to the field of laser treatment and comprises a laser coupling unit, a quartz shell, a lens group and a base, divergent light beams output by a laser are shaped into annular light beams through a laser coupling unit, and the composite annular light beams with multiple wavelengths are selectively reflected and transmitted through at least one conical lens which is installed in a shell and plated with a dichroic membrane. An axial annular light beam under the reflection wavelength is converted into a circumferential annular light beam, the transmitted axial annular light beam is converted into a collimated light beam through a second conical lens in the base and then is output in the axial direction, and then the axial collimated light beam with the specific wavelength and the circumferential annular light beam with the specific wavelength are output at the same time through the same device. Changes of different wavelengths, different light beam shapes and different light beam directions can be completed through one device, a compound treatment effect can be conveniently played in the laser medical field, and the practicability of a laser medical instrument is improved.

A display device includes: a display panel including a light emitting layer; an optical layer disposed on the display panel; and an optical lens disposed on the optical layer and including an optical lens phase retardation layer in which circularly polarized light provided from the optical layer is converted into linearly polarized light. The optical layer includes: a first phase retardation layer disposed on the display panel; a selective reflection layer disposed on the first phase retardation layer and configured to output linearly polarized light by transmitting light coincident with the polarization axis and to reflect light not coincident with the polarization axis; and a second phase retardation layer disposed on the selective reflection layer, in which linearly polarized light incident from the selective reflection layer is converted into circularly polarized light.

A thin optical device having high light utilization efficiency and less chromatic aberration and a small electronic device including the optical device are provided. The thin optical device includes a first reflective polarizing plate, a lens, an optical rotator, a retardation plate, and a second reflective polarizing plate. The optical device can be a thin optical device by rotation of the polarization plane of linearly polarized light with the optical rotator and utilization of a property of selectively reflecting circularly polarized light of the second reflective polarizing plate. Furthermore, the optical device does not use a half mirror and thus has a property of high light utilization efficiency. When the second reflective polarizing plate has a layered structure, chromatic aberration of an optical system can be reduced.

The application belongs to the field of liquid crystal materials, and relates to a liquid crystal / polymer light-adjusting and display device capable of realizing scattering state-reflective state-transparent state transition under electric driving. The liquid crystal material comprises a bent liquid crystal molecule mixture with a twisted bent nematic phase, a nematic phase liquid crystal mixture and a chiral dopant, and the liquid crystal material can form an inclined helical arrangement under electric driving. The application provides a flexible liquid crystal / polymer composite device capable of realizing three-state transition of 'opaque state', 'wide-spectrum reflective state' and 'transparent state' under electric driving and a preparation method thereof by using an inclined helical cholesteric phase liquid crystal to replace traditional liquid crystal materials. The'reflective state' can realize dynamic regulation and control of selective reflection in a wide light spectrum range from full visible light to near infrared, and greatly expands the performance and application of a traditional liquid crystal / polymer composite device.

A pigment composition including: a first cholesteric liquid crystal pigment; and a second cholesteric liquid crystal pigment, wherein: the first cholesteric liquid crystal pigment is a pigment having: a center wavelength of a selective reflection band within a wavelength range of 400 nm or more and 800 nm or less; and a selective reflection bandwidth of 150 nm or less; the second cholesteric liquid crystal pigment is a pigment having a selective reflection bandwidth of 200 nm or more within a wavelength range of 400 nm or more and 800 nm or less; the selective reflection band of the first cholesteric liquid crystal pigment and a selective reflection band of the second cholesteric liquid crystal pigment at least partially overlap with each other; and a containing amount of the first cholesteric liquid crystal pigment relative to a total amount of the first cholesteric liquid crystal pigment and the second cholesteric liquid crystal pigment is more than 0% by weight and 30% by weight or less.

A wearable virtual retinal display (VRD) device configured to be worn by a person comprises a spectacle-like frame puttable on a head of said person; said spectacle-like frame carrying following elements disposed along a laser beam: (a) a laser light source configured for generating said laser beam at at least one radiation frequency; (b) a microelectromechanical system (MEMS) configured for scanning said laser beam forming a laser radiation pattern to be projected to a person's retina; (c) a lens; (d) a selective reflector positionable in front of a person's eye. The selective reflector is configured for reflecting laser radiation at the at least one frequency. The selective reflector has a piecewise-smooth reflective surface comprising a plurality of curvilinear selective reflecting elements, which in cooperation with said lens are configured for directing said laser radiation pattern onto a person's retina; said laser radiation pattern being scanned by said MEMS forms an image of an object of interest on said person's retina.

The invention discloses an independent chiral liquid crystal optical device based on dynamic frequency regulation and control and a preparation method of the independent chiral liquid crystal optical device. The independent chiral liquid crystal optical device comprises a conductive substrate, an alignment layer, a cholesteric liquid crystal layer with a stable polymer and an electrode, the precursor mixture is prepared from a nematic phase liquid crystal matrix, a chiral dopant, a polymerizable liquid crystal monomer and a photoinitiator; and the screw pitch of the cholesteric liquid crystal layer is dynamically regulated and controlled through the frequency of an alternating current electric field, so that the dynamic regulation of the selective reflection center wavelength is realized. The cholesteric liquid crystal is packaged between the two conductive substrates, the spiral structure and the photonic band gap characteristics of the cholesteric liquid crystal are accurately regulated and controlled through alternating current electric field frequency parameters, real-time dynamic modulation of the output light wavelength and the circular polarization state is achieved, the limitation of concentration curing of a traditional chiral agent is broken through, and the chiral liquid crystal is obtained. The dynamic reconfigurable control of output characteristics of circularly polarized light is realized, and the dynamic reconfigurable circularly polarized light engine is used as a universal circularly polarized light engine, has a plug-and-play characteristic, and can be directly integrated with various light emitting units.

A thin optical device having high light utilization efficiency and less chromatic aberration and a small electronic device including the optical device are provided. The thin optical device includes a first reflective polarizing plate, a lens, an optical rotator, a retardation plate, and a second reflective polarizing plate. The optical device can be a thin optical device by rotation of the polarization plane of linearly polarized light with the optical rotator and utilization of a property of selectively reflecting circularly polarized light of the second reflective polarizing plate. Furthermore, the optical device does not use a half mirror and thus has a property of high light utilization efficiency. When the second reflective polarizing plate has a layered structure, chromatic aberration of an optical system can be reduced.

In the present disclosure, provided is a reflection structure having a frequency selective reflection plate that reflects an electromagnetic wave of a specific frequency band in a direction different from a regular reflection direction, the reflection structure comprising: a substrate having a first alignment mark; and a plurality of the frequency selective reflecting plates arranged side by side on one surface of the base material, the distance between adjacent frequency selective reflecting plates being less than 1 / 2 of the wavelength of the electromagnetic wave.

A pigment composition includes first and second cholesteric liquid crystal pigments. The first cholesteric liquid crystal pigment has a center wavelength of a selective reflection band within a wavelength range of 400 nm or more and 800 nm or less and a selective reflection bandwidth of 150 nm or less. The second cholesteric liquid crystal pigment has a selective reflection bandwidth of 200 nm or more within a wavelength range of 400 nm or more and 800 nm or less. The selective reflection band of the first cholesteric liquid crystal pigment and a selective reflection band of the second cholesteric liquid crystal pigment at least partially overlap with each other. A containing amount of the first cholesteric liquid crystal pigment relative to a total amount of the first and second cholesteric liquid crystal pigments is more than 30% by weight and 80% by weight or less.

The invention discloses a display module and a display device. The display module comprises a light emitting layer, a light shielding layer, a chiral light emitting layer and a polarization function layer which are sequentially stacked. The light-emitting layer includes a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit that emit a first color light, a second color light, and a third color light, respectively. The chiral light emitting layer covers the first light emitting unit, the second light emitting unit and the third light emitting unit. The brightness of first color light emitted by the light-emitting layer is smaller than that of the second color light and that of the third color light, the chiral light-emitting layer comprises at least one sub-chiral light-emitting layer, and the side, close to the light shielding layer, of the at least one sub-chiral light-emitting layer comprises a first sub-chiral light-emitting layer; the first sub-chiral light-emitting layer selectively transmits circularly polarized light with positive rotation in the first color light and selectively reflects circularly polarized light with negative rotation in the first color light. The light emitting efficiency of the display module can be improved to a greater extent.

A thin optical device having high light utilization efficiency and less chromatic aberration and a small electronic device including the optical device are provided. The thin optical device includes a first reflective polarizing plate, a lens, an optical rotator, a retardation plate, and a second reflective polarizing plate. The optical device can be a thin optical device by rotation of the polarization plane of linearly polarized light with the optical rotator and utilization of a property of selectively reflecting circularly polarized light of the second reflective polarizing plate. Furthermore, the optical device does not use a half mirror and thus has a property of high light utilization efficiency. When the second reflective polarizing plate has a layered structure, chromatic aberration of an optical system can be reduced.

This invention discloses an optically pumped tunable vertical-cavity surface-emitting laser (VCSEL), a mirror, and their applications. The wavelength-selective mirror includes a phase-matching region and an optimization region arranged sequentially along the vertical direction. The phase-matching region is formed by periodically alternating stacks of x pairs of first high-refractive-index material layers and first low-refractive-index material layers along the vertical direction. The optimization region is formed by y pairs of second high-refractive-index material layers and z pairs of second low-refractive-index material layers, which are alternately stacked along the vertical direction, and the optical thicknesses of the second high-refractive-index material layers and the second low-refractive-index material layers are unequal. This invention breaks away from the traditional single optimization paradigm centered on lasing light in DBRs, significantly improving optical pumping efficiency while ensuring a wide tuning range and free spectral range, thereby realizing a highly efficient wide-tunable single-longitudinal-mode output MEMS-VCSEL, laying the foundation for next-generation high-performance tunable lasers.

The invention relates to a display device and optical equipment, the display device comprises a display panel and a first light control layer, the display panel is configured to emit first light, the first light control layer is arranged on the light emitting side of the display panel, the first light control layer comprises first cholesteric liquid crystal, the first cholesteric liquid crystal is configured to reflect light of an infrared band, and the first light control layer is arranged on the light emitting side of the display panel. The first light penetrates through the first lens; according to the display device, the selective reflection characteristic of the first cholesteric liquid crystal to light is utilized, the infrared light is reflected through the first light control layer, the infrared light entering the display device is reduced, then the influence of heat generated by ambient light on all components or film layers in the display device is reduced, and the heat management efficiency of optical equipment is improved.

The application discloses a low-scattering large-angle wave-transparent electromagnetic metasurface based on angle multiplexing, which comprises an angle selection layer and a phase control layer; the phase control layer is used for controlling the reflection phase of an angle incident electromagnetic wave in a first range; the angle selection layer is used for selectively transmitting an angle incident electromagnetic wave in a second range and selectively reflecting an angle incident electromagnetic wave in the first range, and comprises a second dielectric substrate and metal grounds on the upper and lower surfaces of the second dielectric substrate, the upper metal ground is etched with first and second slot structures, and the lower metal ground is etched with third and fourth slot structures; the two layers of slot structures are arranged in a staggered mode in a unit arrangement direction of a plane, and the first, second, third and fourth slot structures extend to the edges of the unit structures along another unit arrangement direction of the plane and are in communication with the slot structures of adjacent units. The application realizes the integration of scattering suppression and large-angle wave-transparent functions, and effectively improves the function multiplexing capability and system integration degree of the electromagnetic metasurface device.

The application discloses a novel multi-mode display material and a preparation method thereof. The novel multi-mode display material comprises a multi-mode display layer, and the multi-mode display layer is formed by compounding a CLCE matrix and an up-conversion luminescent material. The CLCE matrix is a controllable cross-linking density elastic network with a spiral superstructure, and the spiral pitch of the CLCE matrix is regulated by a chiral agent concentration, a mechanical force or heat, so that a photonic band gap is regulated. Meanwhile, the chiral agent can also regulate a chiral selective reflection function through the chirality of the chiral agent. The up-conversion luminescent material comprises a functionalized luminescent component, the functionalized luminescent component is combined with the CLCE matrix through a covalent grafting or an adaptive dispersion mode, and the functionalized luminescent component can generate up-conversion luminescence under excitation of specific wavelength light. Through the synergistic effect of the CLCE matrix and the up-conversion luminescent material, the multi-mode display layer has four-dimensional orthogonal optical functions of mechanical response, thermal response, light response and chiral selective reflection.

Provided are: a laminated film for displaying a projection image, which has excellent impact resistance and excellent visibility of an image projected onto a laminated glass for displaying a projection image when the laminated glass for displaying a projection image is formed by sandwiching two glass substrates; provided are laminated glass for projection display and a projection display system. This laminated film for displaying a projected image has a support, a selective reflection layer disposed on one surface side of the support, and a heat-sealing layer disposed on the other surface side of the support, the average thickness of the heat-sealing layer being 5 [mu] m or more, and the surface of the heat-sealing layer on the opposite side from the support side exhibiting predetermined characteristics.

The application belongs to the technical field of wireless communication and antenna design, and particularly relates to a wideband low RCS antenna and terminal based on a frequency selective reflection hybrid structure. The antenna comprises a low-frequency wave-absorbing layer, a three-dimensional frequency selective reflection structure and a circularly polarized antenna layer. The low-frequency wave-absorbing layer is composed of a dielectric substrate and two curved metal strips respectively etched on the upper and lower sides of the dielectric substrate, and the two curved metal strips are perpendicular to each other. A patch resistor is embedded at the perpendicular point of the curved metal strip. The three-dimensional frequency selective reflection structure is composed of a hollow cuboid dielectric plate with metal etched on the adjacent inner side surface. The circularly polarized antenna layer is composed of dielectric layers and metal layers arranged alternately from top to bottom. The first metal layer and the second metal layer are different rectangular shapes with the same cut corner position. The antenna can radiate with high efficiency within the working band, suppress the out-of-band RCS, maintain the circularly polarized antenna performance and ensure the high gain and wideband characteristics.

Provided is a head-up display system and a transportation machine including the head-up display system, the head-up display system including a windshield glass having a selective reflection layer and a projector including laser light sources of three colors of blue light, green light, and red light for forming a projection image on the windshield glass,in which the selective reflection layer includes the following selective reflection central wavelengths λB, λG, and λR at a light incidence angle of 60°,400⁢ nm≤λB<500⁢ ⁢nm500⁢ nm≤λG<600⁢ ⁢nm600⁢ nm≤λR<700⁢ ⁢nmall of XB / XG, XB / XR, and XG / XR are in a range of 0.80 to 1.20.In the above, XB=RB×LB, XG=RG×LG, and XR=RR×LR.RB, RG, and RR indicate a natural light reflectivity at λB, λG, and λR, and LB, LG, and LR indicate the brightness of blue, green, and red laser beam emitted from the projector.

The present invention addresses the problem of providing an optical laminate with which ghosting does not easily occur when applied to a head-mounted display. An optical laminate according to the present invention comprises: a selective reflection layer that includes at least one cholesteric liquid crystal layer; and a first adjacent layer that is disposed adjacent to the outermost cholesteric liquid crystal layer disposed at the outermost side of the selective reflection layer and is selected from the group consisting of an optical isotropic layer and a C plate. When the half-value wavelength on the long wavelength side of the reflection spectrum of the outermost cholesteric liquid crystal layer is denoted by λmax, the half-value wavelength on the short-wavelength side is denoted by λmin, and the number of spiral pitches is denoted by P, the nmax and nmin calculated by equations (1) and (2) satisfy the relashipships with a refractive index n1 on the outermost cholesteric liquid crystal layer side of the first adjacent layer in formulas (3) to (5).　Equation (1): nmax = λmax / P, equation (2): nmin = λmin / P, formula (3): nmax > n1, formula (4): nmin < n1, formula (5): |(nmax·min)1 / 2 - n1| ≤ 0.03

The invention provides a focusing type compound lens and a folding optical system, which can realize diopter adjustment while reducing the optical thickness. The focusing type compound lens comprises a light incident lens layer; the first electrode layer is positioned on the light-emitting side of the light-in lens layer and is used for applying a first voltage; the second electrode layer is positioned on one side, far away from the incident lens layer, of the first electrode layer and is used for applying a second voltage different from the first voltage so as to form an electric field between the first electrode layer and the second electrode layer; the nematic phase liquid crystal layer is arranged in an electric field between the first electrode layer and the second electrode layer and is used for being electrically controlled to focus; and the selective reflection assembly is stacked on the light outlet side of the light inlet lens layer and is used for selectively reflecting one kind of polarized light and selectively transmitting the other kind of polarized light.