2620results about "Liquid crystal compositions" patented technology

The invention provides a liquid crystal composite for an active-matrix-addressed electro-optical display device and application of the liquid crystal composite. The liquid crystal compound comprises a compound with a general formula (I) which occupies 10 percent to 30 percent of the total weight of the liquid crystal composite, a compound with a general formula (II) which occupies 5 percent to 30 percent of the total weight of the liquid crystal composite, a compound with a general formula (III) which occupies 10 percent to 40 percent of the total weight of the liquid crystal composite, and a compound with a general formula (IV) which occupies 10 percent to 60 percent of the total weight of the liquid crystal composite. The liquid crystal composite provided by the invention has a relatively high response speed and good low temperature storage stability. The invention further provides the active-matrix-addressed electro-optical display device comprising the liquid crystal composite.

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 discloses a liquid crystal compound, the structural formula of the liquid crystal compound is as shown in the following formula I, # imgabs0. The liquid crystal compound has large dielectric anisotropy delta epsilon, high elastic constant K, good low-temperature intersolubility, small rotary viscosity gamma 1 and large elastic constant K, the liquid crystal composition containing the liquid crystal composition has large dielectric anisotropy delta epsilon, high elastic constant K, good low-temperature intersolubility, small rotary viscosity gamma 1 and large elastic constant K, and can be used for developing liquid crystal display elements or liquid crystal displays which have high response speed and can effectively improve residual images.

Embodiments of improved process flows and methods are provided to pattern a semiconductor substrate using direct self-assembly (DSA) of metalate salt ionic liquid crystals (ILCs) having metalate anions. After self-assembly of the metalate salt ILCs into ordered structures, an oxidation process is used to remove the organic components of the ordered structures and convert the metalate anions into metal oxide patterns. In addition to providing a robust metal oxide pattern, which can be transferred to the underlying substrate, the process flows and methods disclosed herein enable ILCs to be used as pitch multipliers in advanced patterning techniques.

Embodiments of improved methods and processes are provided for patterning a semiconductor substrate using direct self-assembly (DSA) of ionic liquid crystals (ILCs). In the disclosed embodiments, an ILC solution comprising ILCs is deposited on a variety of substrate surfaces. An upper surface of the ILC solution is exposed to a gas phase, non-polar solvent (such as, e.g., hexane gas). The gas phase, non-polar solvent provides an ambient environment that promotes self-assembly of the ILCs into vertically layered ILC structures.

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 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 present invention relates to liquid-crystalline (LC) media or LC materials and to energy saving liquid-crystal displays (LCDs) containing these media, especially to gaming displays and AR / VR headsets addressed by an active matrix and in particular to LC displays of the TN, PS-TN, STN, TN-TFT, OCB, IPS, PS-IPS, FFS, HB-FFS, XB-FFS, PS-FFS, SA-HB-FFS, SA-XB-FFS, polymer stabilised SA-HB-FFS, polymer stabilised SA-XB-FFS, positive VA or positive PS-VA type.

The present invention discloses a liquid crystal alignment agent, including a polyamic acid-polyimide copolymer and an organic solvent. The block polymer in the polyamic acid-polyimide copolymer is prepared by a diamine component comprising a structure shown in the following formula (1) and at least one dianhydride component selected from cyclobutane tetracarboxylic dianhydride shown in the following formula (3-1) and 1,3-dimethylcyclobutane tetracarboxylic dianhydride shown in the following formula (3-2); In formula (1), X1 and X2 each independently represent a single bond or an alkyl group with 1 to 6 carbon atoms; Y1 and Y2 each independently represent one or more of -NHCO-, -CONH-, -OCO-, -COO-; Ar is a nitrogen-containing heterocyclic structure. The present invention can provide a liquid crystal alignment film for a lateral electric field driven liquid crystal display element endowed with high mechanical strength and high transmittance and a liquid crystal display element having the liquid crystal alignment film.

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 element includes two substrates with a transparent conductive film, the substrates being arranged such that transparent conductive films face each other, and a liquid crystal-polymer composite film which is sandwiched between the two substrates with a transparent conductive film, in which the liquid crystal-polymer composite film contains an acetylene alcohol.

The invention relates to a gray dye composition, which consists of at least one yellow dichroic dye, at least one red dichroic dye, at least one purple dichroic dye and at least one blue dichroic dye, and has uniform total absorption in a visible light region when being mixed with a parent liquid crystal composition for use. The liquid crystal composition has high contrast when applied to light valves, switchable windows, switchable mirrors and guest-host displays.

Disclosed is a liquid crystal composition. The liquid crystal composition includes liquid crystal molecules including at least one of a liquid crystal compound having an alkenyl group and a liquid crystal compound having an alkoxy group, and a first stabilizer including a compound having a structure represented by Formula 1:where n is 0 or 1; m is 0 or 1; k is 0 or 1; Z1, Z2, and Z3 are each independently a single bond, —C═C—, —OCO—, —COO—, —CF2O—, or a C1 to C5 alkylene group; X1, X2, X3, and X4 are each independently hydrogen or halogen; Y is hydrogen, an alkylene group, an alkoxy group, a hydroxyl group, —NHCOCH3, or ═O; and A and B are cyclic compounds.

Provided is a liquid crystal alignment film which suppresses AC afterimage at a high level and which reduces charge accumulation and flicker due to backlight. The liquid crystal aligning agent contains the following polymer (A) and polymer (B). The polymer (A) is selected from the group consisting of polyimide precursors having formula (A1) and polyimides that are imides of the polyimide precursors. The polymer (B) is selected from the group consisting of polyimide precursors of formula (B1) and polyimides that are imides of the polyimide precursors, and the proportion of tetravalent organic groups represented by formula (X-10) is 40 mol% or more with respect to the total of 1 mol of tetracarboxylic acid residues of the polymer (B). # imgabs0 # (wherein the meaning of each symbol in the formula is as defined in the description. ) # imgabs1 # (* represents a bond).

The present invention relates to a liquid-crystal (LC) medium (as a subcategory of liquid crystal material), based on a mixture of polar compounds, to its use for optical, electro-optical and electronic purposes, in particular in LC displays, especially in LC displays of the vertically aligned mode, to an LC display of the vertically aligned mode comprising the LC medium, especially an energy-saving LC display and to a process of manufacturing the LC display.

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 present disclosure provides an alignment method and application of a cyanobiphenyl liquid crystal composite doped with an organic donor material. The organic small molecule is doped in the host cyanobiphenyl liquid crystal, and the small molecule donor / cyanobiphenyl liquid crystal mixture is directionally induced to assemble by virtue of the large surface energy difference between the superhydrophobic structured substrate and the superhydrophilic flat substrate. The liquid crystal molecules form a uniform arrangement under the action of the liquid bridge, driving the self-assembly of the small molecule donor to be embedded in the cyanobiphenyl liquid crystal, forming a structure of electron donor-donor, enhancing the conductivity of the liquid crystal composite device, studying the influence of the surface tension of the solvent on the performance of the composite, and giving a direction for the selection of the solvent. Compared with the methods of inducing the alignment of liquid crystal molecules and donor small molecules by using electric fields, magnetic fields, photolithography, capillary methods, etc., this method is simpler and more feasible, easy to transfer, the circuit pattern is easy to design, and has good stability.

The invention provides a liquid crystal aligning agent, a liquid crystal alignment film, a liquid crystal display element and a manufacturing method of the liquid crystal aligning agent. The liquid crystal aligning agent can obtain a liquid crystal alignment film which has excellent adhesion and can inhibit AC ghosting at a high level. A liquid crystal aligning agent containing a polymer component P containing one or more polymers, a compound C1, and a compound C2, the polymer component P containing at least one polymer p selected from the group consisting of polyimide precursors and polyimides that are imides of the polyimide precursors. Compound C1 is a compound having two or more structures represented by formula (c-1). The compound C2 is a compound represented by formula (c-2).

The invention relates to an electric heating type liquid crystal elastomer artificial muscle and a preparation method thereof, belongs to the technical field of intelligent high polymer materials, and solves the technical problems that the liquid crystal elastomer artificial muscle in the prior art is easy to harden and embrittle due to excessive filler and is weak in deformability. The electric heating type liquid crystal elastomer artificial muscle comprises two layers of liquid crystal elastomer films and an electric heating element, the electric heating element is arranged between the two layers of liquid crystal elastomer films; the raw materials of the liquid crystal elastomer film comprise a liquid crystal unit, a chain extender, a cross-linking agent and a catalyst. Wherein the liquid crystal unit is 1, 4-bis-[4-(3-acryloyloxy propoxy) benzoyloxy]-2-methyl benzene. Joule heat generated by the electric heating element can activate the liquid crystal elastomer, deformation of the liquid crystal elastomer is not limited, and therefore the liquid crystal elastomer has the advantages of being high in deformability, controllable in heating mode and time, programmable in driving and the like; and a self-sensing function is also realized, and the shape change can be monitored and regulated in real time according to the resistance.

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.

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.

A liquid crystal composition as a material used for elements for controlling electromagnetic wave signals in a frequency range of 1 GHz to 10 THz, and an element containing this composition are provided. In the liquid crystal composition, a characteristic balance is excellent, and at least one of characteristics of a wide temperature range of a nematic phase, a large refractive index anisotropy in a frequency region used for control, and a small dielectric loss tangent (tan δ) is satisfied. A liquid crystal composition containing at least one compound selected from compounds represented by Formula (1) is provided:wherein R1 is an alkyl having 1 to 12 carbon atoms; ring A1 is 1,4-phenylene; L11, L13, L14, L16, Y11, and Y12 are each hydrogen; L12 is fluorine; and L15 is methyl.

Composite materials and devices including composite materials are disclosed. Exemplary composite materials include a porous material and ferroelectric nematic liquid crystal within pores of the porous material. The composite materials can be used in a variety of applications, such as capacitors, information storage and processing, actuators, sensors, electro-caloric devices, energy storage and / or conversion devices utilizing piezoelectric effects. The porous material can be a solid, a polymer, glassy, crystalline, amorphous, foam, an aerogel or ceramic.

The invention provides a rapid photoresponse liquid crystal elastomer actuator and a preparation method thereof, and belongs to a liquid crystal elastomer actuator in the technical field of high polymer materials. The liquid crystal elastomer actuator is a uniformly-oriented single-domain high-entropy alloy liquid crystal polymer, and is obtained by longitudinally and uniformly stretching a multi-domain high-entropy alloy liquid crystal polymer and then initiating photopolymerization by ultraviolet light; the multi-domain high-entropy alloy liquid crystal polymer contains dispersed high-entropy alloy and is obtained by cross-linking liquid crystal monomers; the fast photoresponse liquid crystal elastomer actuator is of a hollow radial symmetrical structure. The quick light response liquid crystal elastomer actuator has a full-solar spectrum absorption response function, has excellent plasticity and self-recovery performance, is simple and convenient in manufacturing process, integrates sensing, driving and built-in feedback loops, has high light tracking precision and self-adaptive phototropism, and can be used in the field of light tracking. And a brand new technical approach is provided for research and development of the intelligent soft robot.

A liquid crystal optical element includes an optical function layer and two transparent substrates. The optical function layer is sandwiched between two transparent substrates. The optical function layer contains liquid crystal molecules and a photoisomerization material. The liquid crystal optical element switches between a light-transmitting state and a light-scattering state according to an orientation state of the liquid crystal molecules. The optical function layer holds the liquid crystal molecules and the photoisomerization material within a mesh structure formed of a resin-particle aggregate. Therefore, light can be strongly scattered when the liquid crystal optical element is in a screen state, and a high-contrast image is obtained when visible light is projected onto the liquid crystal optical element.

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 preparation method of a 3MDT dimming film and application of the 3MDT dimming film to automobile glass, and relates to the technical field of dimming films. The preparation method of the 3MDT dimming thin film comprises the following steps: uniformly mixing isobornyl acrylate, a cross-linking agent and a photoinitiator, adding a functional filler, stirring and uniformly mixing, adding micromolecular nematic liquid crystal, and stirring to obtain a liquid crystal composite system; injecting the liquid crystal composite system into a liquid crystal box, and performing ultraviolet irradiation to obtain an interlayer film; two PET plastic films serve as substrates, the inner surfaces of the substrates are coated with ITO conductive coatings, the interlayer film is arranged between the two substrates, and the 3MDT dimming film is obtained. The prepared 3MDT dimming film has good heat insulation performance and mechanical performance, the interlayer film of the 3MDT dimming film has excellent hydrophobic performance, and the 3MDT dimming film is suitable for being applied to the aspect of automobile glass.

The invention relates to a high-orientation polyimide fiber based on liquid crystal spinning and a preparation method of the high-orientation polyimide fiber. Rigid anhydride is used as a raw material to prepare para-diacid diester, and the para-diacid diester and rigid diamine are polymerized to prepare a full-para polyamic acid ester solution with lyotropic liquid crystal characteristics; and then adding an organic base catalyst to prepare a spinning solution, and carrying out high-temperature dry spinning, catalytic cyclization and high-temperature heat treatment to prepare the high-orientation polyimide fiber. According to the invention, an organic base catalyst is introduced into a spinning solution with lyotropic liquid crystal characteristics, and the high orientation of a liquid crystal domain along a fiber axis is realized by virtue of the shearing and fluid stretching effects of spinneret orifices; then, on the basis of high-temperature dry spinning and catalytic cyclization reaction, structural transformation from polyamide acid ester to polyimide is achieved while curing forming of the fiber is promoted, locking of an oriented structure and densification of the interior of the fiber are achieved, and therefore the stability and uniformity of the fiber are guaranteed; the method has great application potential in the field of extreme special environments such as aerospace.

Provided are a chiral photosensitive molecular switch, a cholesteric liquid crystal composition, and a display panel and a preparation method therefor. The chiral photosensitive molecular switch has two stable states, and can be transformed from one stable state to the other stable state in response to light, and exist stably. The cholesteric liquid crystal composition comprises: the chiral photosensitive molecular switch, a bent-core molecule mixture, a rod-shaped single crystal mixture and a non-photosensitive chiral dopant; the cholesteric liquid crystal composition can be used to prepare a cholesteric liquid crystal display panel, the cholesteric liquid crystal comprising two stable states having different rotation directions, and being able to reflect light having different rotation directions. By adopting the strategy of light regulating the rotation direction of a cholesteric liquid crystal and an electric field regulating a reflection band, it is possible to obtain a cholesteric liquid crystal display panel having high reflectivity, high contrast and good stability, and which can be applied to electric field regulation of reflection in the full spectrum range.