510 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 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 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.

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.

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.

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 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 (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 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.

According to the liquid crystal composition, all components (general formulas I-IV) contain F atoms, and the limitation that only part of components of a traditional liquid crystal material contain F atoms is broken through. The problems of high transparent haze and slow low-temperature response of a negative dielectric liquid crystal material are effectively solved. A traditional fluorinated compound is easy to separate from a polycyclic structure due to non-uniform F distribution, so that the optical uniformity is poor, and low-temperature viscosity drastic increase and high-temperature molecule out-of-order are difficult to improve at the same time. Through all-component F-containing design, the dielectric anisotropy is reduced, and the negative dielectric property is endowed; meanwhile, a special space structure and uniform distribution of F atoms synergistically enhance the stability of an intermolecular interaction network, maintain a low-viscosity characteristic in a wide temperature range, inhibit abnormal rise of low-temperature viscosity so as to accelerate response and reduce delay, inhibit out-of-order arrangement of high-temperature molecules, remarkably reduce the decreasing amplitude of fog-state light transmittance and improve the fog-state light transmittance. And collaborative optimization of optical uniformity, response speed and high-temperature stability is realized.

The invention discloses a preparation method of a PNLC film and application of the PNLC film in an automobile intelligent dimming awning, and belongs to the technical field of liquid crystal materials for intelligent awning glass and preparation of the liquid crystal materials. The problems that an existing automobile intelligent dimming awning cannot meet the rapid dimming requirement and is poor in reliability and durability and the like are solved. A bifunctional liquid crystal monomer RM82 and a nematic liquid crystal E7 are compounded, acrylate end group polymerization of the RM82 is realized under the initiation of ultraviolet light, meanwhile, a biphenyl core structure and E7 can form a strong pi-pi conjugation effect, a phase separation energy barrier of the PNLC film is remarkably reduced, GQDs serve as a scattering enhancer, the PNLC film is endowed with a dynamic luminescence capability by utilizing the fluorescence characteristic of the GQDs, and the PNLC film has a good application prospect. The orientation of liquid crystal molecules is regulated and controlled through an electric field or temperature, the light scattering state is changed, switching of light transmitting, light scattering and light emitting is achieved, and the starry sky effect is simulated.

The utility model provides a constant-temperature liquid crystal phased array system based on semiconductor technology, which comprises a liquid crystal phased array module and a semiconductor temperature control module, liquid crystal materials are clamped between an upper quartz glass substrate and a lower quartz glass substrate, the semiconductor temperature control module is arranged below the lower quartz glass substrate, and the semiconductor temperature control module comprises a ceramic substrate, a metal conductor, an N-type semiconductor and a P-type semiconductor. Precise heating or cooling of the liquid crystal phased array is achieved by changing the current direction. The temperature sensor monitors temperature information in real time and feeds back the temperature information to the control unit, and the control unit dynamically adjusts the semiconductor module to ensure that the liquid crystal phased array stably works within a preset temperature range. According to the system, the influence of environment temperature change on the performance of the liquid crystal phased array is solved, the natural recovery speed of liquid crystal molecules can be increased, the dynamic regulation and control capability of the system is improved, and the system is suitable for various stable temperature environments.

The invention relates to the technical field of flexible sensors, and particularly discloses breathable ion skin which comprises water, a polymer, a liquid crystal and a conductive ion active substance. The material with unique soft elasticity is prepared by combining the orderly-oriented liquid crystal material and the polymer elastomer, the excellent adhesion stability can be kept under the cyclic load, and the stripping interface toughness is high. The composite fiber membrane of a liquid crystal elastomer core-ion skin shell structure is prepared through coaxial electrostatic spinning, the liquid crystal elastomer core provides good structural stability and adhesion stability, the ion skin shell provides good signal detection capacity, and meanwhile, the porous membrane structure prepared through electrostatic spinning has the ultrahigh water vapor permeability and can be used for preparing the composite fiber membrane of the liquid crystal elastomer core-ion skin shell structure. Sweat generated at the contact site of the ion skin and the human skin can be quickly volatilized, sweat accumulation is reduced, and the human skin does not have inflammatory response after the ion skin is worn for a long time.

The present invention relates to a highly conjugated photocurable discotic liquid crystal monomer based on benzotrithiophene-bridged carbazole and its application in 4D printing intelligent manufacturing, belonging to the technical field of liquid crystal materials. The structural general formula is as shown in Formula (I). In the present invention, carbazole and thiophene groups with good optoelectronic response are introduced into the photocurable liquid crystal molecular system to replace the low-conjugated phenyl structure bridged by traditional ester bonds, which not only realizes a lower driving voltage for 4D printing structures, but also the position of carbazole-NH is convenient for introducing flexible side chains, further realizing the regulation of the phase transition temperature of liquid crystal materials.

The present invention discloses a liquid crystal composition with high transmittance and a liquid crystal display device thereof. The liquid crystal composition of the present invention comprises: at least one compound of general formula I, at least one compound of general formula II, and at least one compound of general formula III. The present invention also discloses a liquid crystal display device comprising the liquid crystal composition. While maintaining appropriate rotational viscosity, optical anisotropy, and clearing point, the liquid crystal composition of the present invention also has a large average elastic constant. The liquid crystal molecules of the liquid crystal composition exhibit good order, a large perpendicular dielectric to dielectric ratio, and high transmittance. As a result, the liquid crystal display device comprising the composition has a faster response speed, higher contrast and transmittance, a lower threshold voltage, and reduced energy consumption of the liquid crystal display device. The composition is a liquid crystal material with better overall performance and is particularly suitable for liquid crystal display devices in display modes such as IPS. #imgabs0#

The present invention relates to dichroic dye compounds of formula I, as defined in claim 1, which are based on the donor-acceptor structure wherein the donor moiety comprises a polycyclic heteroaromatic group consisting of at least four fused rings, to mesogenic media comprising one or more compounds of formula I, the present invention relates to novel compounds, mesogenic media and liquid crystal materials, and to the use of these compounds, mesogenic media and liquid crystal materials in optical, electronic and electro-optical applications, in particular in devices for regulating energy through external spaces into internal spaces, for example in switchable windows for solar control in smart buildings and vehicles, with energy conservation and improved comfort.

The invention relates to a novel liquid crystal material and application thereof, a double five-membered heteroaromatic ring is used as a core structure unit of a liquid crystal molecule, so that the liquid crystal material keeps high dielectric anisotropy, and meanwhile, the rotary viscosity of the liquid crystal molecule is remarkably reduced. A polar substituent group is introduced at the tail end of a molecule, so that the electro-optical performance is further optimized, particularly, the dimming contrast ratio and the response speed are obviously improved, and the compound also has excellent damp-heat stability and can meet the requirements of application scenes such as large-area intelligent dimming windows and vehicle-mounted anti-dazzle rearview mirrors. The liquid crystal material provided by the invention not only provides excellent electro-optical performance, but also has low-voltage driving, high dimming contrast and excellent environmental stability, provides an innovative material solution for a next-generation high-speed and low-power-consumption liquid crystal display device, and has wide application prospects and good industrialization potential.

A display driver drives a color sequential liquid crystal display. The display driver obtains pixel intensity data for a pixel of the display, including a first color sub frame (CSF) pixel intensity value and a second CSF pixel intensity value for a second CSF following the first CSF. Selection logic is applied to the pixel intensity data to select a start time for a modulation pulse: for a given second CSF pixel intensity value, in response to a first first CSF pixel intensity value, a first start time is selected from a plurality of predefined potential start times; and in response to a second first CSF pixel intensity value greater than the first first CSF pixel intensity value, a second start time later than the first start time is selected. The liquid crystal material of the pixel is driven with a modulation pulse starting at the selected start time.

This invention relates to the field of holographic polymer-dispersed liquid crystal materials technology, providing liquid crystal functionalized nanoparticles, their preparation method, and materials. The liquid crystal functionalized nanoparticles include a nanoparticle core, a surface-modified layer bonded to the nanoparticle core, and a liquid crystal functionalized layer bonded to the surface-modified layer. Advantages: Liquid crystal transformation is achieved by chemically bonding small-molecule liquid crystal building blocks to the nanoparticles. By limiting the types of liquid crystal building blocks, the compatibility between the nanoparticles and the HPDLC system is improved, effectively solving the aggregation problem of traditional nanoparticle-doped HPDLC. Furthermore, this invention utilizes the inductive effect of the liquid crystal building blocks bonded to the nanoparticles and the high diffusion coefficient of the small-molecule liquid crystal building blocks, combined with the chemical potential gradient driving the holographic photopolymerization process and the excellent compatibility between the nanoparticles and the liquid crystal, to achieve directional enrichment of nanoparticles into liquid crystal microregions, further improving phase separation regularity.

The invention discloses a dye liquid crystal composition and application thereof, and belongs to the technical field of liquid crystal materials. The dye liquid crystal composition is composed of a liquid crystal main body, a dichroic dye and a chiral agent, and the liquid crystal main body is composed of at least one compound represented by a general formula I, at least one compound represented by a general formula II and at least one compound represented by a general formula III: I, II and III. The dye liquid crystal composition has the beneficial effects that the dye liquid crystal composition is relatively high in response speed, relatively low in driving power consumption, relatively high in contrast ratio and good in photo-thermal stability.

The invention discloses an organic compound and application thereof. The organic compound has a structure as shown in a formula I. In the formula I, R1 and R2 represent C1-C15 straight-chain, branched-chain alkyl or alkoxy in a same or different manner at each occurrence, and R1 and R2 represent C1-C15 straight-chain, branched-chain alkyl or alkoxy at each occurrence. Wherein any one or more disconnected-CH2-can be replaced by cyclopropylidene, cyclobutyl, cyclopentadiene or cyclopentadiene,-CH = CH-,-N (Re)-,-O-,-S-,-CO-,-CO-O-and-O-CO-in a form that O-or S-is not connected with each other, and at least one-CH2-in R1 and R2 is replaced by cyclopropylidene, cyclobutyl, cyclopentadiene or cyclopentadiene. The organic compound structure has the characteristics of low melting point, good low-temperature solubility and small normal temperature-high temperature contrast change rate. The liquid crystal material can be uniformly mixed with mixed crystals and completely dissolved at a relatively low processing temperature, and the risk of thermal decomposition or phase change of the liquid crystal material can be reduced. # imgabs0 #

The invention discloses an ABX3 type perovskite material stabilized by a liquid crystal material and a preparation method of the ABX3 type perovskite material, and belongs to the field of semiconductor photoelectric materials and energy materials. The preparation method comprises the following steps: (1) uniformly mixing lead iodide and dodecyl dimethyl benzyl ammonium bromide, and carrying out heat treatment reaction to obtain a liquid crystal material solid; (2) dissolving the obtained liquid crystal material solid in an organic solvent to obtain a precursor solution; and (3) coating the surface of the ABX3 type perovskite thin film with the obtained precursor solution to obtain the ABX3 type perovskite material stabilized by the liquid crystal material. The ABX3 type perovskite which is high in quality and ultrahigh in stability is prepared through the method, the stability and the photoelectric property of the perovskite material are improved in order of magnitude, and the ABX3 type perovskite can be widely applied to the photoelectric fields of batteries, light emitting, detectors and the like; the preparation method has the characteristics of simplicity, easiness in control, convenience in operation, lower cost and the like, and is convenient for large-scale production in factories.

The present invention relates to the technical field of liquid crystal compounds, and in particular to a liquid crystal compound containing a polyfluorophenanthrene structure, and also to an application thereof. The liquid crystal compound provided by the present invention has a structure shown in general formula (I), and the compound has excellent properties such as high negative dielectric anisotropy, good liquid crystal mutual solubility, and relatively low rotational viscosity, and can be used to improve the performance of liquid crystal materials.