549 results about "Liquid crystalline" patented technology

Embodiments of improved methods are provided to form ordered structures on a surface of a substrate using direct self-assembly (DSA) of ionic liquid crystals (ILCs). More specifically, various embodiments of methods are provided to control the pitch of a layered structure formed on a substrate surface via self-assembly of ILCs having cation head groups, alkyl tail groups and anions. In the embodiments disclosed herein, the pitch of the layered structure is controlled by: (a) controlling the cation / anion charge ratio of the cation head groups and anions included within the ILCs, and / or (b) adding an ionic liquid to a solution comprising the ILCs.

The invention belongs to the technical field of optical materials, and discloses a holographic polymer dispersed liquid crystal composition, a holographic grating and a preparation method. The composition comprises the following components in parts by mass: 0.5-1.5 parts of a photoinitiator, 2-5 parts of a co-initiator, 15-20 parts of a first monomer, 15-20 parts of a second monomer, 10-15 parts of a third monomer, 10-15 parts of a solvent and 10-20 parts of mixed liquid crystal. Wherein the first monomer is a monofunctional acrylic monomer, the second monomer is a bifunctional acrylic monomer, the third monomer is a polyfunctional acrylic monomer, the mixed liquid crystal comprises 10-25 wt% of a monomer liquid crystal and 75-90 wt% of a nematic liquid crystal, and the monomer liquid crystal contains fluorine as a benzene ring substituent and contains cyano or isothiocyano as an end group. Through cooperation of the monomer liquid crystal and the nematic liquid crystal in the mixed liquid crystal and cooperation of fluorine atoms and cyano / isothiocyano groups in the monomer liquid crystal, the holographic grating prepared from the composition has the characteristics of low haze and high diffraction efficiency, and the grating can be thinner, so that the requirements of light weight and clearness of AR glasses can be met.

The invention provides a driving method of a display panel, a driving circuit and a display device.In the driving method of the display panel, reference voltage and environment temperature form a first mapping table, target electrical parameters of the display panel and the environment temperature form a second mapping table, and a temperature sensing module is adopted to detect the environment temperature of the display panel; the method comprises the following steps: acquiring a corresponding detection voltage, comparing the detection voltage with a changing reference voltage, acquiring a target reference voltage according to an overturning state of a level signal obtained by comparison, and acquiring a current environment temperature according to the target reference voltage; various target electrical parameters of the display panel are determined according to the environment temperature and the second mapping table, parameter adjustment of the display panel is carried out, linkage adjustment of the multiple different electrical parameters is achieved, it is guaranteed that the display panel obtains different voltage setting and driving voltages at the current environment temperature, the effectiveness of low-temperature compensation is improved, and the user experience is improved. The deflection consistency of the liquid crystal is realized, and the display effect is improved.

The invention relates to the technical field of wireless communication and sensing, and particularly discloses a holographic amplitude weighting-based two-dimensional antenna array multi-beam scanning method, which comprises the following steps of: determining the position information of each radiation unit in a two-dimensional antenna array, including calculating the interval and the arrangement mode of the units; an amplitude weighted value of each radiation unit is generated according to the target wave direction, a two-dimensional multi-beam holographic amplitude weighting technology is used, and the radiation unit amplitude weighted values are determined through the two-dimensional multi-beam holographic amplitude weighting technology; generating a corresponding binary discretization coding sequence based on the amplitude weighted value so as to control the excitation amplitude of each radiation unit; and designing a liquid crystal-based Ka-band two-dimensional holographic beam scanning leaky-wave antenna square array, and regulating and controlling a radiation pattern of a two-dimensional antenna array through the coding sequence to realize multi-beam scanning.

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.

New compounds and their mixtures enable the formation of the ferroelectric nematic liquid crystalline phase at ambient temperature. Compounds of the formula I are presented,in which the variable groups have the meanings indicated in claim 1. Liquid crystal media comprise at least one compound of the formula I.

A liquid crystal elastomer (LCE) formed from liquid crystalline monomers having 4-(6-(acryloyloxy)n-oxy)phenyl-4-(6-(acryloyloxy)m-oxy)benzoate (CnBAPE) as the mesogenic core. The LCEs have improved thermotropic characteristics, including lower thermotropic activation temperatures. The LCEs may also incorporate azobenzene to thereby also enhance the phototropic properties of the LCE.

A light emitting device is described. The light emitting device includes a single light emitting photonic crystal having an electroluminescent material disposed in the single light emitting photonic crystal. The single light emitting photonic crystal includes a series of layers of chiral liquid crystalline polymer. The electroluminescent material is localized in one of the layers of chiral liquid crystalline polymer. At least one of the series of layers of chiral liquid crystalline polymer includes a chiral liquid crystalline, charge carrier transporting polymer. The single light emitting photonic crystal further includes a second luminescent material, where energy emanating from the electroluminescent material stimulates the second luminescent material into light emission, and the light emitted by the light emitting device is a mixture of light emitted by the electroluminescent material and light emitted by the second luminescent material.

The invention discloses a method and a device for determining liquid crystal phase compensation of silicon-based liquid crystal. The method comprises the following steps: respectively representing a first polarization state and a second polarization state according to a first Mueller matrix of the silicon-based liquid crystal in a modulation state, a second Mueller matrix of the silicon-based liquid crystal in a non-modulation state and a Mueller matrix of the liquid crystal phase compensation unit; establishing a first contrast evaluation function according to the first polarization component in the first polarization state and the second polarization component in the second polarization state; converting independent variables in the first contrast evaluation function from the azimuth angle and the ellipsometry into the optical axis azimuth angle and the phase delay degree according to the characterization relation to obtain a second contrast evaluation function; and obtaining a target optical axis azimuth angle and a target phase delay degree according to the second contrast evaluation function, so that liquid crystal phase compensation parameters are quickly determined, and the contrast of an LCOS light machine in a bright field and a dark field is improved.

The invention discloses a transmission type liquid crystal terahertz spatial light modulator with a large switch ratio. The transmission type liquid crystal terahertz spatial light modulator structurally comprises an upper-layer quartz substrate, an upper-layer metal structure, a liquid crystal layer, a lower-layer metal structure and a lower-layer quartz substrate in sequence from top to bottom, the upper-layer metal structure is adhered to the back surface of the upper-layer quartz substrate and is a four-opening square ring reverse structure array, and the lower-layer metal structure is adhered to the top surface of the lower-layer quartz substrate; and the liquid crystal layer is filled between the upper-layer metal structure and the lower-layer metal structure to form a metal-medium-metal structure. The electro-optical effect of the liquid crystal is utilized, the FPGA is communicated with the electrodes corresponding to the metal structures, voltage is applied between the upper-layer metal structure and the lower-layer metal structure, the effective dielectric constant of the liquid crystal can be changed by adjusting the voltage, and therefore on-off of terahertz waves is achieved. And the upper computer controls the FPGA to output voltage through an instruction so as to realize programmable regulation and control of the device.

Provided is a liquid crystalline polyester fiber capable of achieving improved weatherability without kneading a UV absorber into the fiber or attaching a weatherable UV absorber after fiber spinning. The liquid crystalline polyester is a fiber that consists essentially only of a liquid crystalline polyester, in which the amount of UV absorber used is 5 mass % or less, and the strength retention in the weather fastness test with xenon arc lamp light in accordance with JIS L 0891 is 60% or more.

Lipid-based nanoparticles containing lipids, phenolic compounds, and, optionally, metal ions are provided. In certain forms, the nanoparticles adopt non-lamellar, lyotropic, liquid crystalline structures. Bioactive lipid-based nanoparticles containing one or more active agents are also provided as are methods of treating diseases or conditions with said bioactive lipid-based nanoparticles and formulations thereof.

The invention belongs to the technical field of liquid crystal alignment agents, and particularly relates to a liquid crystal alignment agent, a liquid crystal alignment film and a liquid crystal display element. The liquid crystal alignment agent comprises polyamic acid, a main chain of the liquid crystal alignment agent contains short side chain diamine and carbonate bonds, the short side chain diamine can slow down direct collision between film surfaces, carbonyl on a short side chain enhances absorption of ultraviolet light, and the compressive strength of a liquid crystal alignment film and the cracking alignment performance of the liquid crystal alignment film are improved; the carbonic ester bond can improve the voltage holding rate thermal stability of the liquid crystal alignment film and can improve the anchoring force of the liquid crystal alignment film and liquid crystals, the liquid crystal alignment agent with high compressive strength, voltage holding rate, high thermal stability and low linear polarization ultraviolet exposure is finally obtained, the stability of the high voltage holding rate improves the residual image of a display device, and the display effect is improved. And due to high compressive strength, the undesirable phenomenon of ZARA of the liquid crystal display device can be reduced.

The present disclosure relates to a laundry treating apparatus for positioning a liquid crystal at the center of a manipulation portion when a display including a liquid crystal is installed inside a rotating manipulation portion.

A battery module that comprises an electrochemical cell is provided. The battery module includes a polymer composition that comprises a polymer matrix that includes a thermotropic liquid crystalline polymer and a thermally conductive filler distributed within the polymer matrix. The polymer composition exhibits an in-plane thermal conductivity of about 3 W / m-K or more as determined in accordance with ASTM E1461-13 (2022) and a deflection temperature under load of about 230° C.) or more as determined in accordance with ISO 75:2013 at a load of 1.8 MPa.

The invention discloses a liquid crystal-based Ka-band broadband circularly polarized phased-array antenna, and belongs to the technical field of microwave antennas. The antenna comprises a radiation structure and a feed structure. The radiation structure comprises a radiation unit, a liquid crystal layer, a grounding plate, a control circuit, a bias network and a radio frequency direct current isolation structure. The control circuit is realized by an FPGA (Field Programmable Gate Array) and is connected with the radiation unit through a bias network; the radio frequency direct current isolation structure is used for isolating direct current and radio frequency signals; the feed structure adopts a waveguide feed mode and forms a wave beam in a specified direction through phase compensation of the array units; the bandwidth of the antenna array is increased by using a sequential rotation feed mode, the offset line arrangement of the array is designed, and the radio frequency direct current isolation design is added, so that the technical problem that the circularly polarized bandwidth of the liquid crystal phased-array antenna is relatively narrow is solved.

The new media exhibit a ferroelectric nematic phase preferably at ambient temperature. They preferably comprise one or more compounds selected from the group of compounds of formulae IA, IB and IC,in which the variable groups have the meanings indicated in the text and in the claims. Use of the media for providing ferroelectric nematic materials and a method of operation of an electro-optical device are presented. The media may be useful for energy-saving displays and electrical appliances.

The present disclosure relates to the technical field of display. Provided are a display panel and a display apparatus, which aim to improve the light-output gain of a near-eye display apparatus. The display panel comprises a plurality of sub-pixels, wherein each sub-pixel comprises a liquid crystal, and a color film layer and a driving structure layer, which are respectively located on two opposite sides of the liquid crystal. Each sub-pixel further comprises: an optical structure, which is located on a light-output path from a backlight source of the display panel to a light-emergent face of the display panel, wherein the optical structure comprises at least one lens, the lens is at least used for converging light emitted from the backlight source, and the orthographic projection of the lens on a plane of the display panel overlaps an opening region of the sub-pixel; and a light-shielding structure, which comprises a part located on the driving structure layer and a part located on the color film layer, wherein the orthographic projection of the light-shielding structure on the plane of the display panel overlaps an edge of the opening region.

LC media exhibiting a ferroelectric nematic phase at ambient temperature, comprising at least one or more compounds of formula IA having at least five rings,The mixtures are useful for electro-optics, electronics, electro-mechanic and other applications for materials with very high dielectric permittivity.

A liquid crystal composition contains a side chain type polymer liquid crystalline compound which can form a light absorption anisotropic film having a high alignment degree and has excellent solubility in a general-purpose solvent, a light absorption anisotropic film obtained using the composition, a laminate, and an image display device. The composition includes: a side chain type polymer liquid crystalline compound; and a dichroic substance, in which the compound is a copolymer having a repeating unit (1) containing a mesogenic group with a molecular weight of greater than 280 and a repeating unit (2) with a molecular weight of 280 or less, a content of the repeating unit (2) is less than 14% by mass with respect to a total mass of the compound, and a content of the dichroic substance is greater than 2% by mass with respect to a total solid content of the composition.

Disclosed is an aqueous additive or sealing composition for cementitious compositions comprises a water-soluble salt of carbonate or hydrogen carbonate, a silica-based material, a specifically selected dispersant, at least one specifically selected thickening agent, and water. Furthermore, a method of manufacturing the aqueous additive or sealing composition, a cementitious composition comprising a hydraulic cementitious binder, a mineral aggregate, the aqueous additive composition, and optionally water and its preparation method is described. Moreover, a method of treating a surface of a cementitious structure by applying the aqueous additive or sealing composition on a surface of a cementitious structure as surface treatment agent or coating material is disclosed. The disclosed additive and sealing composition can be used as liquid crystalline waterproofing admixture composition in several applications.

The invention discloses a control method of a micro light-emitting unit array display, electronic equipment of the micro light-emitting unit array display and a computer program product. In the display process of the current frame, the micro light-emitting unit array display adopts a preset scanning time sequence to sequentially scan the backlight of each pre-divided partition; and when the target partition backlight is scanned, backlight control is performed based on the response stage of the liquid crystal corresponding to the partition: the target partition backlight is closed when the liquid crystal is in the turnover stage, and the target partition backlight is opened based on the target brightness when the liquid crystal is in the stable stage. By means of accurate matching of the backlight switch and the response state of the liquid crystal, smear and ghosting generated when the liquid crystal is displayed in the overturning process can be avoided, and therefore dynamic blurring is effectively reduced, and the definition of a moving picture is improved. Meanwhile, the method does not need a complicated frame insertion frequency multiplier circuit or whole-screen black frame insertion, so that the excellent dynamic display performance can be realized with lower cost on the premise of keeping higher brightness output.

Described herein are various embodiments for liquid crystal elastomers (LCE) formed from liquid crystalline monomers having 4-(6-(acryloyloxy) n-oxy) phenyl-4-(6-(acryloyloxy)m-oxy)benzoate (CnBAPE) as the mesogenic core. The LCEs described herein have improved thermotropic characteristics, including lower thermotropic activation temperatures. The LCEs described herein may also incorporate azobenzene to thereby also enhance the phototropic properties of the LCE.

The invention discloses a liquid crystal performance prediction method and device based on molecular dynamics and a liquid crystal theory, and relates to the technical field of liquid crystal performance prediction.The method comprises the steps that the molecular structure of liquid crystal to be simulated is confirmed, and the molecular structure of the liquid crystal is obtained; generating a coarse graining molecular structure and a coarse graining force field parameter through a coarse graining scheme; constructing a nematic phase initial structure of the volume phase system; performing molecular dynamics simulation at a set temperature to obtain molecular dynamics simulation trajectory data, calculating to obtain a molecular director of liquid crystal molecules, and determining an overall director; a second-order-sequence parameter and a fourth-order-sequence parameter are obtained through calculation; constructing a correlation function and fitting to obtain the rotation relaxation time of the system; according to a Nemtsov-Zakharov formula or a Fialkowski formula, the rotary viscosity of the liquid crystal is obtained through calculation; constructing a change relation of the second-order-sequence parameter along with the temperature; and performing fitting analysis through a Maier-Saupe theory or a critical index formula to determine a phase change point. The liquid crystal performance prediction efficiency can be improved, the cost is reduced, and the prediction precision is improved.

The invention provides a manufacturing method of a circularly polarized organic ultra-long room-temperature phosphorescent film based on chiral lyotropic liquid crystal, and belongs to the technical field of optical materials, and the manufacturing method comprises the following steps: step 1, dissolving glucose and room-temperature phosphorescent polymer (RTP) in a cellulose nanocrystal (CNC) aqueous solution, and uniformly mixing; and 2, putting the mixed solution in the step 1 into an open device, and evaporating to obtain the circularly polarized organic ultra-long room-temperature phosphorescent film based on the chiral lyotropic liquid crystal, which is marked as a CP-RTP film. According to the invention, different types of RTP: P1, P2, P3 or P4 are doped with chiral lyotropic liquid crystal CNC by virtue of glucose, so that the mixed chiral photon film with full-color and adjustable CP-RTP characteristics is shown, and meanwhile, the glum value as high as 0.59 and the long-life phosphorescence life of 371 milliseconds are realized. In addition, the three-dimensional thin film with excellent processability and multi-polarization characteristic can be realized by means of some molds.

The invention relates to the field of aero-engine heat transfer and mass transfer, and discloses a convective heat transfer coefficient integrated test method and system based on transient liquid crystal, a narrow-band thermochromic liquid crystal coating is sprayed on the surface of a test piece, and test airflow in an air inlet channel can realize temperature step through a wire mesh heater. By synchronously measuring the color developing time of a narrow-band thermochromic liquid crystal coating on the surface of a test piece and a temperature step curve of test airflow, non-contact two-dimensional test of the convective heat transfer coefficient of the test piece is realized by utilizing the corresponding relation between the color changing characteristic of narrow-band thermochromic liquid crystal and the temperature; not only can great influence on the accuracy of test data caused by asynchronous signal acquisition be avoided, but also the problems of heat conduction error and influence on flow field distribution caused by interference on fluid in the traditional test technology are avoided, and the test precision of the convective heat transfer coefficient of the test piece is ensured. And powerful technical support is provided for research on convective heat transfer characteristics of complex flow fields in the aerospace field.

A temperature sensor comprising a housing that receives a temperature measuring element is provided. The housing includes a polymer composition comprising a polymer matrix that includes a thermotropic liquid crystalline polymer. The polymer composition exhibits a melt viscosity of about 150 Pa−s or less and a deflection temperature under load of about 170° C. or more.

An epoxy resin B-stage film obtained by semi-curing an epoxy resin composition, the epoxy resin composition including: a liquid crystalline epoxy monomer capable of forming a cured product that includes a liquid crystal structure; and a curing agent, in which the epoxy resin B-stage film has an average thickness of less than 8 μm, and in which the liquid crystal structure included in the cured product turns into a liquid crystal structure, in which molecules are orientated in a film thickness direction, by being cured.

The present invention relates to a reprocessable or recyclable cured liquid crystal epoxy resin that can be reprocessed or recycled, a re-cured product thereof, and a method for producing same. More specifically, provided are: a cured liquid crystalline epoxy resin which is obtained by reacting an epoxy compound and in which a plurality of thermotropic liquid crystal materials are bound each other with a curing agent; a re-cured product thereof; and a method for producing same. The liquid crystalline epoxy resin cured material according to the present invention has excellent physical properties and thermal conductivity, can be reprocessed and recycled through eco-friendly processes while maintaining said properties, and thus can be used as an eco-friendly polymer material in various fields.