277 results about "Liquid Crystalline Materials" patented technology

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.

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.

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 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.

A reflecting device in an embodiment according to the present invention includes common electrodes arranged in a matrix at a distance in a first direction and a second direction intersecting the first direction, bias electrodes arranged overlapping the common electrodes in a planar view, a liquid crystal layer between the common electrodes and the bias electrodes, and common wirings connecting adjacent common electrodes among the common electrodes. Each of the common wirings has a length of half an effective wavelength λg when a radio wave of a specific wavelength λ propagates through the liquid crystal layer.

This invention discloses an optical lens device comprising: a liquid crystal material housed between two half-cell components; wherein one or more of the two half-cell components include a first concentric electrode pattern and a second concentric electrode pattern, the first concentric electrode pattern and the second concentric electrode pattern being electrically operable in parallel to at least switch the liquid crystal material to a first state and switch out of the first state; wherein the first state includes a cooperative refractive index distribution in adjacent first and second regions centered on an optical axis; wherein at least one of the two half-cell components includes at least one annular solid wall structure located in a reset region between a first edge of the first region and a second edge of the second region; and wherein the solid wall structure is positioned closer to the first region than to the second region; and when the liquid crystal material is in the first state, the refractive index of unpolarized light propagating in a direction perpendicular to the half-cell components is more closely matched with the liquid crystal material at the first edge of the first region than the liquid crystal material at the second edge of the second region.

The invention provides a micro display screen light field control structure and a preparation method thereof, and relates to the technical field of micro display. Comprising a substrate, a silicon-based OLED device, a thin film packaging layer and a liquid crystal control layer, wherein a pixel definition layer with a specific inverted trapezoidal structure is arranged on the substrate; the silicon-based OLED device is evaporated on the substrate; the thin film packaging layer covers the silicon-based OLED device and forms a water vapor isolation layer; the cover plate glass is carved into a strip-shaped conductive thin film and distributed with a strip-shaped cathode of the silicon-based OLED device in a crossed mode, the driving circuit is used for controlling the deflection state of liquid crystal molecules, and the silicon-based OLED device comprises a chiral OLED device film layer structure and is used for emitting circularly polarized light. According to the invention, the light field distribution can be stably regulated and controlled, the high-quality naked-eye 3D display effect is realized, and the stable operation of the silicon-based OLED device is effectively ensured.

The application relates to a fluorine-containing ferroelectric nematic liquid crystal molecule and application thereof, relates to the technical field of photoelectric materials, and solves the problem of low dielectric constant of traditional liquid crystal materials which restricts the application of the liquid crystal materials in photoelectric functional devices. The molecule adopts a unique non-chiral V-shaped configuration design, takes a benzene ring as a core skeleton, and realizes performance optimization through meta-connection of differentiated functional side chains. In the molecular structure design, a strong electron-withdrawing trifluoromethyl substituent is introduced into the benzene ring 2, 4 of one end of the side chain, the intermolecular interaction force is enhanced, and the long-range order of the material is maintained; the other end adopts an alkoxy flexible chain structure, which not only improves the solubility of the material, but also enhances the thermal stability. The raw material is easy to obtain, the preparation is simple, the fluorine-containing ferroelectric liquid crystal molecule is in a nematic phase, the dielectric constant can be as high as 1.4 x 10 4 (1 kHz), and has a wide ferroelectric nematic phase transition temperature, high polarization intensity and nonlinear optical response, and has important application value in the field of photoelectric functional materials.

The present application relates to ferroelectric nematic liquid crystal (FNLC) compounds characterized by chemical structures having electron donor–acceptor chromophores connected via linkers. The compounds have a general structure of A1–L1–A2–L2–(Ax–Ly)n–B, where A and B are aryl or heteroaryl groups, and L are linkers selected to promote spontaneous polar alignment in the nematic phase. The FNLCs enable enhanced second-order nonlinear optical properties and electro-optic coefficients (r33), with values exceeding, e.g., 30 pm / V in some embodiments. The FNLC compounds also exhibit absorption maxima above 400 nm, indicating extended π-conjugation and strong intramolecular charge transfer. The present application also includes compositions and mixtures of such compounds, which may form glassy ferroelectric nematic phases suitable for integration into nonlinear optical devices.

The invention discloses a liquid crystal composition and a liquid crystal display panel. The liquid crystal composition comprises a liquid crystal material, a polymerizable compound or a polymer containing a polymerized form of the polymerizable compound, and a self-alignment additive, the liquid crystal material comprises a first liquid crystal compound, a second liquid crystal compound, a third liquid crystal compound and a fourth liquid crystal compound; the first liquid crystal compound is selected from at least one of a formula I-1 and a formula I-2; the second liquid crystal compound is selected from at least one of compounds represented by a formula II; the third liquid crystal compound is selected from at least one of a formula III-1 and a formula III-2; the fourth liquid crystal compound is selected from at least one of a formula IV-1 and a formula IV-2; the chemical structural formula of the polymerizable compound is shown as a formula V; the chemical structural formula of the self-alignment additive is shown as a formula VI. The liquid crystal composition provided by the invention has the advantages of high response speed, high stability, high penetration rate and the like, and can realize vertical alignment of a liquid crystal material under the condition that a polyimide alignment layer is not needed.

The utility model discloses a visual PVC baggage tag for baggage identification relates to baggage tag related field, including PVC baggage tag, visualization mechanism and protective layer, the front of PVC baggage tag right lower end adheres and is connected with the visualization mechanism, the left end adheres and is connected with the protective layer, the visualization mechanism is provided, the visual mechanism is connected with the protective layer, the visual mechanism is connected with the protective layer, the visual mechanism is connected with the protective layer, the visual mechanism is connected with the protective layer, and the protective layer is connected with the protective layer. Visual management of luggage is achieved through the RFID chip, then abrasion resistance and corrosion resistance of the RFID chip are enhanced through the multiple protective layers, the probability that the RFID chip is imitated and replaced is reduced, meanwhile, the two-dimensional code serves as an auxiliary means for visualization of the RFID chip, and management efficiency is further improved; the protective layer is arranged, the ultraviolet resistance, the flexibility, the tear resistance and the flame retardance of the PVC luggage tag are improved through the multiple material layers, visual display of the temperature is achieved through the liquid crystal material layer, and articles in a luggage case are prevented from going bad and being damaged due to too high or too low temperature.

The invention discloses a magnetic element modified potassium niobate-based spiral electric polarization ceramic and a preparation method thereof. The chemical composition is (1-x) KNbO3-xFe2O3, wherein x is more than or equal to 0.0005 and less than or equal to 0.002. The preparation method comprises the following steps: weighing K2CO3, Nb2O5 and Fe according to a stoichiometric ratio, grinding, pre-sintering and ball-milling to obtain raw material powder, pressing the powder into sheets by using a mold, and sintering at 1030-1040 DEG C for 2 hours to obtain the iron element modified potassium niobate-based ceramic. The preparation method disclosed by the invention is simple in preparation steps, green, friendly and high in repeatability, has a spiral electric polarization characteristic similar to that of a liquid crystal material, and has the comprehensive performance ranges of high energy storage efficiency of 96.60-97.87% and breakdown field strength of 110-440kV / cm under different proportions. The lead-free functional inorganic material has great commercial application value.

A ferroelectric liquid crystal (FLC) material for the deformed helix FLC (DHFLC) electro-optical mode devices and shows optimum electro-optical properties including high tilt angle (>38°), and short helix pitch (<120 nm), and spontaneous polarization (>100 nC / cm2) comprising at least two components, wherein at least one FLC component is a chiral compound of Formula (I):particularly:wherein W1 and W2 are chiral groups with polar substituent at chiral centre, A and B are independently N atom or CH groups providing that at least one of A or B is N atom. Other various groups are as defined herein.

An electrically switchable liquid crystal cell (10) is provided together with a lens (50) having this liquid crystal cell, and a method for manufacturing the liquid crystal cell. The liquid crystal cell (10) has a diffractive optical element (12) and a liquid crystal material (14) that can be switched between a mismatched (unswitched) state and a matched (switched) state. In the mismatched state, the effective refractive index of the liquid crystal material (14) is different from the effective refractive index of the substrate (18) of the diffractive optical element (12). In the matched state, the effective refractive index of the liquid crystal material (14) matches the effective refractive index of the substrate (18). In the matched state, the diffractive optical element does not contribute to the focal power of the lens. The diffractive optical element (12) has a number of peaks (20) and valleys (30) with rounded corners.

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

This invention provides a liquid crystal composition with high-definition brightness, which has a high brightness and is beneficial for increasing the operating temperature range of the liquid crystal material. The liquid crystal composition is composed of 10% to 40% of compound I1, 5% to 20% of compound I2, 5% to 20% of compound I3, 5% to 10% of compound I4, 10% to 30% of compound I5, 5% to 30% of compound I6, 0% to 10% of compound I7, 0% to 5% of compound I8, 0% to 5% of compound I9, 0% to 30% of compound I10 and 0% to 10% of compound I11.

Disclosed in the embodiments of the present application are a metasurface unit, and a metasurface array antenna and a communication device containing same. The metasurface unit includes a first-layer dielectric plate, a second-layer dielectric plate and a third-layer dielectric plate, wherein the second-layer dielectric plate includes a metal grounding layer, a liquid-crystal material layer, a metal patch having anisotropic characteristics, and a direct-current bias line, and both the direct-current bias line and the metal patch are printed on the liquid-crystal material layer; and the first-layer dielectric plate is one surface of the metasurface unit, the third-layer dielectric plate is another surface of the metasurface unit, and the second-layer dielectric plate is located between the first-layer dielectric plate and the third-layer dielectric plate.

The application discloses a liquid crystal composition with large birefringence and high reliability, which comprises at least one compound with general formula I, at least one compound with general formula II, at least one compound with general formula III, at least one compound with general formula IV, at least one compound with general formula V, at least one compound with general formula VI, and the compound with general formula I accounts for 1-20% in mass fraction, the compound with general formula II accounts for 0-30% in mass fraction, the compound with general formula III accounts for 1-45% in mass fraction, the compound with general formula IV accounts for 5-60% in mass fraction, the compound with general formula V accounts for 1-30% in mass fraction, and the compound with general formula VI accounts for 0-15% in mass fraction. The other compounds are used to replace the compounds containing acetylenic compounds and cyano compounds, the reliability of the liquid crystal material is further improved under the premise of ensuring the large birefringence, and the service life and display effect of a terminal device are improved.

The invention discloses a wide-temperature-range color development stabilizing method of a liquid crystal display screen, which is characterized in that through innovative structural design and a dynamic compensation mechanism, the stability of a display bottom color is maintained in an extreme temperature range from-30 DEG C to 80 DEG C. An electric control birefringence compensation layer is additionally arranged between a lower glass substrate and a lower polaroid, and the layer is made of a polymer network stable liquid crystal material; a temperature sensor and a voltage controller are integrated in the system, the environment temperature is detected in real time, corresponding compensation voltage 0-10 V is applied to the transparent driving electrode, the effective birefringence and the optical axis direction of the compensation layer are accurately regulated and controlled, phase delay drift caused by temperature change is dynamically counteracted, and therefore the polarization effect of the polarizer is improved. And the wide-temperature-range color cast performance is optimized. Compared with the prior art, the liquid crystal display device has the advantages that the technology is fast in response, special liquid crystal materials or box thickness gradient design is not needed, and the visual quality and reliability of liquid crystal display in an extreme environment are greatly improved.

The application belongs to the technical field of liquid crystal materials, and particularly relates to a liquid crystal composition and a liquid crystal display element or a liquid crystal display containing the liquid crystal composition. The application discloses a polymer-stabilized complex liquid crystal composition, characterized in that the liquid crystal composition contains one or more compounds shown in formula I, one or more compounds shown in formula II, at least one of compounds shown in formula S-1 and S-2, and at least one polymerizable compound:

The embodiment of the invention provides a display device with a controllable light path, display equipment and communication equipment, and relates to the technical field of display, the display device with the controllable light path comprises a light emitting diode array and light valve glass which are arranged in a stacked mode, and the light valve glass comprises a first glass layer, a light valve control layer and a second glass layer which are sequentially arranged in a stacked mode; the light valve control layer comprises a prism structure and a liquid crystal material, the liquid crystal material is of an oval structure, the refractive index corresponding to the long axis of the liquid crystal material is different from the refractive index corresponding to the short axis of the liquid crystal material, and the refractive index corresponding to the long axis of the liquid crystal material is the same as the refractive index of the prism structure. The refractive index relationship between the liquid crystal material and the prism structure is changed by switching the arrangement direction of the liquid crystal molecules, so that the propagation form of light is controlled, and the controllable adjustment of a light path is realized. The method is suitable for different scenes such as conventional display, privacy peep prevention and directional communication, and the applicability and flexibility of the display device under various use requirements are improved.

The invention provides a liquid crystal antenna, a liquid crystal phased array and electronic equipment, and relates to the technical field of liquid crystal antennas. The liquid crystal antenna comprises a waveguide, a coplanar waveguide coupling layer, a liquid crystal phase shift layer and an antenna radiation layer which are sequentially stacked in the transmission direction; the waveguide is used for transmitting a TE mode wave, the coplanar waveguide coupling layer is used for converting the TE mode wave into at least one TEM mode wave, the liquid crystal phase shift layer is used for converting the TEM mode wave into a target wave beam in a phase shift manner, and the antenna radiation layer is used for outputting the target wave beam in a radiation manner. Therefore, signal interaction is carried out between the waveguide and the liquid crystal phase shifting layer in a mode that the coplanar waveguide coupling layer transmits the TEM mode waves, so that the purpose of signal interaction between the waveguide and the liquid crystal phase shifting layer is achieved, and technical support is provided for implementation of the liquid crystal antenna. The liquid crystal antenna is simple in structure, the liquid crystal material has the properties of low cost and low power consumption, and the cost and the power consumption of the liquid crystal phased array adopting the liquid crystal antenna are reduced.

The application provides a thermo-opto-electric triple-response liquid crystal dopant and application thereof to smart glass, and the molecular formula of the liquid crystal dopant is shown as formula (1). The liquid crystal dopant is doped in a liquid crystal material, and by combining the unique optical and electrical characteristics of the liquid crystal material, the liquid crystal dopant can simultaneously respond to temperature, light and electric field, adapt to various environmental requirements, provide various optical states to meet the energy-saving requirements in different scenes, has high light modulation rate, high haze and strong privacy protection function, has simple preparation process, few synthesis steps, good stability, low raw material cost, and can be applied to fields of residential buildings, commercial buildings, automobile and aircraft windows and the like, and has wide application prospect.

Provided is a dimming device having small azimuthal dependence of transmittance of light emitted in an oblique direction. The present invention includes a first liquid crystal optical element and a second liquid crystal optical element which each contain a liquid crystal material and a guest material and which can change the orientation direction of the guest material by application of a voltage. When the voltage is applied, an angle formed by the azimuth direction in which the guest material in the first liquid crystal optical element is inclined and the azimuth direction in which the guest material in the second liquid crystal optical element is inclined is 170-190°. Between the first liquid crystal optical element and the second liquid crystal optical element, at least two phase-retardation layers A and at least one phase-retardation layer C are included, in which at least a phase-retardation layer A, a phase-retardation layer C, and a phase-retardation layer A are arranged in the stated order. The phrase-retardation layers A satisfy nxA>nzA≥nyA, and the phase-retardation layer C satisfies nzC>nxC≥nyC.

A polymer network stabilised liquid crystal material (PN-LCs) having a ferroelectric liquid crystal phase is presented. Claimed is a process of aligning liquid crystal mixtures exhibiting a ferroelectric nematic or ferroelectric smectic A liquid-crystalline phase in a polar vertical state in relation to a boundary surface. The liquid crystal mixture is stabilized by a polymer network in a vertical alignment relative to the substrate planes enclosing the mixtures. In addition, the present invention relates to electric and electronic elements which contain the poled and aligned ferroelectric liquid crystal material according to the invention.

The application belongs to the technical field of liquid crystal materials, and particularly relates to a liquid crystal composition and a liquid crystal display element or a liquid crystal display containing the liquid crystal composition. The application discloses a polymer-stabilized complex liquid crystal composition, characterized in that the liquid crystal composition contains one or more compounds shown in formula I, one or more compounds shown in formula II, at least one of compounds shown in formula S-1 and formula S-2, and at least one polymerizable compound: