693 results about "Liquid Crystalline Materials" patented technology

The invention provides a liquid crystal dopant with thermal-photoelectric triple response and an application of the liquid crystal dopant on intelligent glass. The molecular formula of the liquid crystal dopant is shown as a formula (1). The liquid crystal dopant is doped in a liquid crystal material, can respond to temperature, illumination and an electric field at the same time by combining the unique optical and electrical characteristics of the liquid crystal material, and adapts to various environment requirements; a plurality of optical states can be provided to meet energy-saving requirements in different scenes; the light modulation rate is high, the haze is large, and the privacy protection function is strong; the material is simple in preparation process, few in synthesis steps, good in stability and low in raw material cost, can be applied to the fields of residences, commercial buildings, automobiles, airplane windows and the like, and has a wide application prospect.

The invention discloses a compound as well as a preparation method and application thereof, and belongs to the field of organic materials. The compound includes a first chain hydrocarbon group, a first phenyl group, a second phenyl group, a thieno [3, 2-b] thienyl group, and a second chain hydrocarbon group. The first chain alkyl is connected to one carbon atom of the first phenyl group, the other carbon atom of the first phenyl group is connected with one carbon atom of the second phenyl group through a first connecting bond, the other carbon atom of the second phenyl group is connected with one carbon atom of the thieno [3, 2-b] thienyl through a second connecting group, and the other carbon atom of the thieno [3, 2-b] thienyl is connected with the second chain alkyl. The first phenyl group has one or two first substituents which are F,-CF3 or-OCF3; the first and second chain hydrocarbon groups are linear alkyl groups, alkoxy groups, fluoroalkyl groups, alkenyl groups, alkenyloxy groups or difluorovinyl groups. The compound can be used as a liquid crystal monomer to improve birefringence, low-temperature stability, high-temperature stability and nematic phase temperature range of a liquid crystal material.

The purpose of the present invention is to provide a device and method for testing the millimeter wave dielectric properties of liquid crystal materials under electrical orientation, which belongs to the field of microwave testing technology. In the dielectric constant test of liquid crystal materials, the present invention designs a liquid crystal box composed of multiple layers of dielectrics, and innovatively uses multiple layers of dielectrics to form a top-bottom symmetrical TM 0n0 The mode double-sided circular patch resonator, and the electric field distribution inside it passes through the multi-layer medium to be tested and is perpendicular to the metal disc. Therefore, by utilizing its internal field distribution characteristics, the structure can use a mode with a higher resonant frequency, greatly broadening the test frequency range, and the test frequency can reach 110GHz. Therefore, the dielectric property test device of the present invention can realize the wide-band dielectric property test of liquid crystal materials in the millimeter wave frequency band, and the test device is simple and easy to implement.

The invention relates to the technical field of semiconductor photoelectronics and liquid crystal materials, in particular to a vortex light laser and a preparation method thereof. The supporting structure is arranged on the laser light source; the liquid crystal structure is arranged on the supporting structure, and the liquid crystal structure is configured to convert linearly polarized light from the laser light source into circularly polarized light and further convert the circularly polarized light into vortex light. In addition, the cholesteric liquid crystal in the liquid crystal structure can change the rotation direction of the circularly polarized light under the irradiation of the ultraviolet light source, so that the topological charge number of the vortex light can be regulated and controlled. Compared with a traditional vortex light laser, the vortex light laser has the advantages of being high in conversion efficiency, low in preparation cost, high in preparation speed, capable of tuning vortex light of orbital angular momentum, capable of conducting autonomous regulation and control on emergent light under the condition that an external electric field is not introduced, and capable of improving the utilization rate of the vortex light. The preparation process is compatible with the traditional semiconductor process, the size is small, and the integration level is high.

The invention relates to the technical field of functional liquid crystal materials, and discloses a liquid crystal film with an intelligent information encryption function and a preparation method and application thereof. The liquid crystal thin film comprises two layers of transparent substrates arranged in parallel and a composite functional layer between the transparent substrates. The composite functional layer comprises a honeycomb polymer matrix and liquid crystals filled in holes of the polymer matrix, and a polymer network is arranged in the liquid crystals; the distribution densities of the polymer networks in different areas of the liquid crystal film are different, so that the liquid crystal film has reversible information patterns which disappear (or display) during power-on and display (or disappear) after power-off; or the reversible change information pattern disappears (or is displayed) at a low temperature and is displayed (or disappears) at a high temperature. The distribution densities of polymer networks in different areas of the liquid crystal film are different, multiple responses of an electric field, a temperature, a magnetic field and the like are achieved, the visual effect that information patterns exist from nothing, exist from existence to nothing or change colors can be achieved, and therefore the intelligent information encryption function is achieved.

The invention discloses a polaroid for brightening sheet roll material compounding. The polaroid comprises a first release film, pressure-sensitive glue, a first cellulose triacetate layer, a polyvinyl alcohol layer, a second cellulose triacetate layer, a special functional layer and a second release film, the polyvinyl alcohol layer is positioned between the first cellulose triacetate layer and the second cellulose triacetate layer; the first release film covers the surface of one side of the first cellulose triacetate layer through pressure-sensitive glue; the special functional layer is coated on the surface of one side of the second cellulose triacetate layer, the second release film covers the special functional layer, and the special functional layer is prepared from an azobenzene side chain type liquid crystal polymer or a polymer stable liquid crystal material. According to the invention, the direct on-line roll-to-roll composite production of the polaroid roll material and the brightness enhancement film roll material is realized, additional manual slitting, splicing and material receiving procedures are not needed, and the product yield and the production efficiency are greatly improved.

The invention discloses a grating waveguide device and waveguide system based on a polarization volume grating technology, and belongs to the technical field of augmented reality display. The device comprises a waveguide substrate and a grating structure, the grating structure adopts a liquid crystal material to form a periodic refractive index modulated PVG through a light-induced orientation and self-assembly process, the polarization state of a light beam can be selectively regulated and controlled, and the rainbow pattern phenomenon caused by ambient light diffraction is inhibited. The efficient diffraction and total internal reflection transmission of the multi-wavelength light beam are realized by optimizing the grating period, the Bragg inclination angle and the waveguide matrix parameters and combining Zemax simulation to optimize the light beam propagation path. The waveguide system can be matched with AR glasses, a head-mounted display and other devices, the intensity of the rainbow lines is remarkably reduced under the complex ambient light condition, and high-definition and distortion-free visual experience is provided.

The invention relates to an annular ultra-wide frequency selective surface unit based on a liquid crystal material and an antenna. The annular ultra-wide frequency selective surface unit sequentially comprises a first dielectric layer, a first metal tuning patch layer, a liquid crystal substrate, a second metal tuning patch layer and a second dielectric layer from top to bottom, on the X frequency band, the first metal tuning patch layer is inductive, the second metal tuning patch layer is capacitive, the sizes of patches in the first metal tuning patch layer and the second metal tuning patch layer are changed, so that the interaction of equivalent inductance and equivalent capacitance between the patches is tuned, the band elimination function is achieved, the liquid crystal substrate is equivalent to a variable capacitor, and the band elimination function is achieved. The dielectric constant is changed through the electric adjustable characteristic, so that the coupling capacitance of the liquid crystal substrate is changed, and the dynamic adjustment of the resonant frequency is realized. The broadband airborne stealth radar antenna effectively solves the problems that a traditional airborne radar antenna is small in bandwidth and tuning range, and meets the development requirements of a miniaturized and integrated broadband airborne stealth radar antenna.

The invention provides a volume holographic grating preparation method, a volume holographic grating, an optical waveguide and a display device, and the method comprises the steps: obtaining a to-be-exposed holographic material which comprises a thermosetting liquid crystal material; providing a liquid crystal box, and filling the liquid crystal box with the holographic material to be exposed; based on a preset light source, performing exposure treatment on the holographic material to be exposed in the liquid crystal box to obtain a grating to be treated; and applying a preset electric field to the to-be-processed grating and heating the to-be-processed grating to which the preset electric field is applied so as to cure the thermosetting liquid crystal molecules oriented by the preset electric field in the to-be-processed grating, thereby obtaining the volume holographic grating. According to the volume holographic grating, the arrangement state stability of the liquid crystal molecules of the volume holographic grating at a relatively high temperature can be improved, so that the diffraction efficiency of the volume holographic grating is ensured, and the optical performance degradation of the volume holographic grating in a high-temperature state is avoided.

The embodiment of the invention discloses a compound, a liquid crystal composition and application thereof, relates to the technical field of liquid crystals, and is used for solving the technical problem that the service life of electronic equipment is short due to the fact that a liquid crystal material is poor in material performance and high in material performance attenuation speed. The compound has a structure as shown in a formula (I). # imgabs0 # wherein X1 and X2 are each independently selected from the group consisting of hydrogen, deuterium, tritium, at least one halogen, and at least one hydrocarbyl group, and at least one of X1 and X2 is not hydrogen. The compound has higher birefringence, better dielectric anisotropy, lower rotary viscosity, higher clearing point, better low-temperature stability and the like, and when the compound is used as a liquid crystal compound, the performance degradation speed of a liquid crystal material is slow, so that the service life of electronic equipment can be prolonged.

The invention provides a broadband vertical coupling transition structure based on a liquid crystal material, relates to the technical field of microwaves, and realizes cross-layer transmission of microwave signals in multilayer media including a liquid crystal layer by completing matching design and electromagnetic coupling between an upper strip line patch and a lower strip line patch through a square groove in a ground layer. Modeling simulation is carried out on the coupling transition structure in three-dimensional electromagnetic field simulation software, the simulation result shows that the overall insertion loss of the coupling transition structure is smaller than 3.7 dB, and the relative bandwidth reaches 100%.

This disclosure provides systems, methods, and apparatuses for transparent displays that support two-way viewing angles. A transparent display may include one or more organic light-emitting diode (OLED) pixels configured for directional display in multiple directions. The pixel configuration may include an OLED, a set of switchable mirrors converging at an angle and configured to reflect an emission from the OLED, and a polymer dispersed liquid crystal (PDLC) material bisecting the angle between the set of switchable mirrors. The pixel configuration may display a first color in a first direction in accordance with the set of switchable mirrors being in a transparent state and the PDLC material being in an opaque state. The pixel configuration may additionally display a second color in a second direction in accordance with the set of switchable mirrors being in a mirrored state and the PDLC material being in a second transparent state.

The invention relates to the technical field of liquid crystal thin films, and discloses a polymer dispersed liquid crystal thin film based on cellulose nanocrystal doping and a preparation method of the polymer dispersed liquid crystal thin film. The photoinitiator comprises the following components in parts by weight: 50-70 parts of a liquid crystal material, 20-35 parts of a matrix polymer, 0.5-2 parts of a photoinitiator, 1-5 parts of a cellulose nanocrystal composite material and 5-15 parts of a solvent. The invention further provides a preparation method of the polymer dispersed liquid crystal film based on cellulose nanocrystal doping. The method comprises the following steps: S1, preparing a cellulose nanocrystal composite solution; taking the cellulose nanocrystal composite material, and dispersing the cellulose nanocrystal composite material in a solvent; by introducing the surface-modified cellulose nanocrystal and nitrogen-doped titanium dioxide composite material into a polymer matrix, the effect of optimizing liquid crystal microdroplet distribution is achieved. Compared with a liquid crystal film which does not use the composite material, the liquid crystal film solves the problems of non-uniform liquid crystal dispersion and unstable photoelectric switching performance, and ensures more uniform optical regulation and higher light transmittance.

The invention belongs to the technical field of display screens, and particularly relates to a liquid crystal display screen response speed optimization method based on temperature compensation, which can accurately measure and compensate phase change point offset of a liquid crystal material. Specifically, the accurate temperature control of the liquid crystal material in the extremely low temperature environment is realized through gradually refining the steps of measuring the current environment temperature, determining a basic compensation value, adjusting the output of a heating element, detecting a phase change point, calculating a temperature offset, updating a compensation strategy, executing independent temperature control on each pixel point and the like. Therefore, the response speed of the liquid crystal display screen is improved, the color accuracy is ensured, the equipment can stably operate under the condition of extremely low temperature, and a high-quality display effect is provided; through the dynamic compensation mechanism, the adaptability and the stability of the liquid crystal display screen under different temperature conditions are remarkably improved.

The invention relates to the technical field of liquid crystal materials, in particular to a thermochromic film based on liquid crystal and a preparation method of the thermochromic film. The preparation method comprises the following steps: coating a liquid crystal mixed solution on a transparent flexible substrate, and curing to obtain a thermochromic liquid crystal layer; the liquid crystal mixed liquid is formed by mixing raw materials including a first liquid crystal mixture, a second liquid crystal mixture, a third chiral agent and a photoinitiator; according to the invention, the modified antioxidant and the hydroxyl-terminated polydimethylsiloxane are introduced into the polyurethane coating, and the transparent flexible substrates are coated with the polyurethane coating, so that the adhesion effect between the transparent flexible substrates is improved; the thermochromic film prepared by the invention is controllable in color, quick in response, wide in color gamut and good in moisture resistance, heat resistance and aging resistance, and can be applied to the fields of liquid crystal display, intelligent glass or anti-counterfeiting.

Eyeglasses may include left and right adjustable lenses. Each adjustable lens may include a stack of liquid crystal cells that are interconnected using vertical interconnect structures such as through-substrate-vias, conductive beads in a liquid crystal sealant, anisotropic conductive adhesive, conductive epoxy, diffusion bonds, eutectic bonds, and / or other suitable interconnect structures. Each liquid crystal cell in the stack may include liquid crystal material sandwiched between first and second substrates. A sealant may surround the liquid crystal material and may include conductive beads that form intra-cell connections between the first and second substrates of that liquid crystal cell. Through-substrate-vias may be formed in the substrate and may be coupled to the conductive beads in the sealant. Anisotropic adhesive, conductive epoxy, or other conductive material may be located between the liquid crystal cells and may be used to form inter-cell connections in the stack.

The utility model discloses a liquid crystal material storage container which comprises a metal shell, the upper portion of the outer side of the metal shell is fixedly connected with a first connecting flange in a sleeved mode, a first bolt hole is formed in the first connecting flange, and the first connecting flange is matched with a second connecting flange. The second connecting flange is fixedly connected to the outer side of the lower portion of the top cover in a sleeving mode, the interior of the metal shell is used for installing and placing the glass inner container, the outer side of the glass inner container is sleeved with a heat preservation buffering cushion, a feeding port is formed in the top of the top cover, and a transparent window is formed in the outer side of the metal shell. The bottom of the metal shell is fixedly connected with the top ends of the supporting legs. The glass inner container is placed in the metal shell, so that the glass inner container can be protected through the metal shell, the metal shell is prevented from directly making contact with the liquid crystal material to generate chemical reaction, and the inner glass inner container can be replaced through the detachable structure of the metal shell and the top cover.

This application provides a liquid crystal metasurface antenna apparatus and a communication apparatus. The liquid crystal metasurface antenna apparatus includes a liquid crystal metasurface reflection plate and a feed source, where the liquid crystal metasurface reflection plate includes a plurality of liquid crystal antenna units; the liquid crystal antenna unit at least includes a plurality of oscillators and two layers of dielectric plates; the plurality of oscillators are disposed between the two layers of dielectric plates; the plurality of oscillators include a horizontal oscillator pair and / or a vertical oscillator pair; and each oscillator includes a left arm, a right arm, and a capacitor, the left arm and the right arm are connected through the capacitor, and a liquid crystal material is filled in a space enclosed by the left arm, the right arm, and the capacitor.

The invention discloses a hidden flexible display screen display method of a smart cabin, and relates to the technical field of display screen display, and the method comprises the following steps: S1, light scattering; s2, pixel optimization is carried out; s3, adding a transparent light cone and a light depression; s4, performing multi-view three-dimensional display; and S5, combining the polaroids. The problems that an existing vehicle-mounted panel is too small in display area and poor in visual effect can be effectively solved through the transparent screen technology, the driving comfort and safety of a driver or a passenger are improved, high-speed switching between transparency and scattering can be freely achieved through light scattering and using of a quick response liquid crystal material, and the driving safety is improved. The optical efficiency and the color coverage rate are improved through pixel optimization, the transparency of the transparent screen and the light transmittance of the screen are improved by adding the transparent light cone and the light depression, the imaging quality is improved by using a multi-view three-dimensional display technology, and the durability of the display screen is improved by using a polaroid formed by combining an iodine polaroid and a dye polaroid.

The invention relates to the technical field of display screen correction, in particular to an LCD display screen color correction system and method, and the method comprises the steps: dividing an LCD display screen into a plurality of independent correction subareas, and obtaining the display parameters of each correction subarea; based on the difference between the display parameter of each correction partition and a preset standard value, constructing a correction partition color difference compensation matrix, and fitting a linear compensation coefficient of the RGB channel through a least square method; smoothing the compensation matrixes of the adjacent correction partitions by adopting a bilinear interpolation algorithm to generate a global compensation mapping table; and dynamically acquiring the temperature of each correction subarea through a temperature sensor network, correcting the compensation matrix based on a thermal expansion coefficient model of the liquid crystal material, updating the global compensation mapping table, and inputting the updated global compensation mapping table into a storage unit of a display screen driving chip to complete correction. The problem that an existing global correction method cannot meet the production requirement for an ultra-large LCD display screen is solved.

A light turning element 850 comprises a layer of liquid crystal (LC) material 852 which defines a plane. The layer of liquid crystal material could comprise LC molecules 855 and is configured such tha

Liquid-crystalline compounds with a terminal 5,6-difluoro-benzo[b]thiophene ring as provided by formula I, liquid crystal mixtures using the compounds, the use of the compounds in an electro-optical display, particularly in an active-matrix display based on the IPS or FFS effect, and liquid crystal displays that contain a liquid crystal material of this type.

A liquid crystal device (400) is provided comprising: a liquid crystal layer having a thickness and comprising: a liquid crystal material; and a plurality of polymer structures (414a, 414b) comprising polymerised liquid crystal material. Each polymer structure (414a, 414b) is located at a different depth in the thickness of the liquid crystal layer. Electrodes are provided configured to apply an electric field to the liquid crystal layer. Each polymer structure (414a, 414b) has a different selected locked-in liquid crystal state.

The invention provides a preparation method of a polarization body holographic device and the polarization body holographic device. The method comprises the following steps: providing a substrate layer; coating a light orientation layer on the substrate layer, and carrying out polarization exposure treatment on the light orientation layer; coating a liquid crystal material on the photo-alignment layer subjected to the polarization exposure treatment, and carrying out photo-alignment and curing treatment on the liquid crystal to form a liquid crystal layer; the surface of the side, away from the substrate layer, of the liquid crystal layer is coated with a bonding layer, and a device layer is attached to the bonding layer; and removing the substrate layer and the light orientation layer to obtain the polarization body holographic device. When the polarization body holographic device is prepared, the light orientation layer and the substrate layer are removed, the problems that the polarization body holographic device becomes yellow and absorbs blue-violet light due to the existence of the light orientation layer and the substrate layer are solved, and the optical performance of the polarization body holographic device is improved.

A liquid-crystal (LC) material comprising one or more compounds of the formula Ihaving negative dielectric anisotropy and the use thereof for optical, electro-optical and electronic purposes, such as for example in LC displays, in particular energy saving displays based on the ECB, IPS or FFS effect.

The invention relates to a head-up display, a use method thereof, electronic equipment and a vehicle comprising the same. The head-up display comprises a backlight system, a liquid crystal display screen, a temperature sensor and a controller, the clear temperature of a liquid crystal material used by the liquid crystal display screen ranges from 105 DEG C to 150 DEG C, and the temperature sensor is arranged on the liquid crystal display screen and used for detecting the temperature of the liquid crystal display screen; the backlight system, the liquid crystal display screen and the temperature sensor are all electrically connected with the controller. The clear temperature of the liquid crystal material in the liquid crystal display screen included in the head-up display is 105 DEG C or above, even if the display screen in the head-up display is overheated due to the fact that sunlight flows backwards, the local concentrated temperature cannot exceed the clear temperature of liquid crystal molecules, then the liquid crystal molecules can be prevented from being dissolved, the liquid crystal display screen can be prevented from losing efficacy, and therefore the user experience is improved. The head-up display provided by the invention can avoid the problem of local non-display caused by sunlight backflow.

The invention discloses a thermochromism and fluorescence dual-response porous liquid crystal material and a preparation method thereof. The preparation method comprises the following steps: synthesizing spiropyrane; preparing a spiropyrane / cyanostyrene derivative / hexadecanoic acid thermochromic material; the preparation method comprises the following steps: preparing Eu-MOF; preparing a thermoluminescence color changing material / Eu-MOF composite material; the porous liquid crystal material with thermochromism and fluorescence dual response is prepared. According to the porous liquid crystal material with thermochromism and fluorescence dual response, the phase change material and the fluorescent material are introduced into the liquid crystal, so that the liquid crystal has different fluorescence display effects above and below the phase change temperature, the color and the shape can be dynamically regulated and controlled, and the porous liquid crystal material is applied to the fields of information storage, camouflage, display and the like.

The invention relates to polymerizable liquid crystal formulations (as a subcategory of liquid crystal material), especially to polymerizable ink formulations for inkjet printing, which are preferably PFAS-free (for enabling the reduction of perfluorocarbons and providing an environment friendly material), and which are comprising one or more polymerizable mesogenic compounds, also known as reactive mesogens (RMs), and one or more organic solvents selected from the group of aromatic ester and aromatic or aliphatic diester solvents, to polymers and polymer films obtained from such formulations, and to the use of the formulations, polymers and polymer films in optical or electrooptical components or devices, especially for digital optics or augmented reality or virtual reality (AR / VR) applications like polarizers, optical compensators, reflective films, diffraction or surface gratings, Bragg polarization gratings (Bragg PG), polarization volume gratings (PVG), polarization volume holograms (PVH), Pancharatnam Berry (PB) gratings, nonmechanical beam steering elements, optical waveguides, optical couplers, optical combiners, polarization beam splitters, partial mirrors, lenses or PB lenses.

The invention discloses a resonance regulation and control device, an optical switch and a wavelength selective switch, and relates to the technical field of optics, the resonance regulation and control device comprises a first electrode structure, a second electrode structure and a liquid crystal material; a liquid crystal material is arranged between two electrodes, and an alignment layer and a metasurface layer composed of a plurality of metamaterial units are arranged between the liquid crystal material and the two electrodes respectively. When the electric field between the two electrodes is changed, the refractive index of the liquid crystal material can quickly change along with the electric field, and meanwhile, each metamaterial unit can quickly change the phase of an input light field of an external optical fiber for ingestion of the liquid crystal material based on the refractive index of the surrounding liquid crystal material. Since the input light field phase can be quickly changed by controlling the electric field between the two electrodes, the light field regulation speed is improved, and the efficiency and speed of optical communication can be improved.