161 results about "Optical anisotropy" patented technology

The invention discloses a rheology-birefringence combined in-situ testing device and method based on chopper rotation frequency signals, belongs to the technical field of optical testing, and aims to solve the technical problems that an existing Spark-FB device is low in measurement accuracy and limits application scenes. The laser emitter emits a light beam along a set angle (forming an angle of 45 degrees with the horizontal plane), the light beam is converted into linearly polarized light through the polarizer, and an optical signal is modulated through the rotating chopper; the modulated light beam penetrates through a polymer sample to which a shear flow field is applied by a commercial rheometer, and transmission light carrying optical anisotropy information of the sample sequentially passes through a 1 / 4 wave plate and a polarization analyzer, and is finally received by a photoelectric detector and transmitted to a lock-in amplifier for analysis. According to the invention, an independent datum reference signal is provided through the chopper, decoupling and combination of a commercial rheometer and a birefringence light path are realized, and synchronous and accurate in-situ measurement of rheological and optical properties of a high polymer material under a deformation condition can be realized.

The present invention provides a liquid crystal composition and a liquid crystal display device. The liquid crystal composition comprises at least one compound of general formula I and at least one compound selected from compounds of general formula II-1 and / or general formula II-2. The liquid crystal composition provided in the present invention has an appropriate optical anisotropy, an appropriate clearing point, a lower rotational viscosity, a higher Kave value and a higher ε⊥ / Δε ratio, and has higher transmittance and contrast rate, and a remarkable low-temperature storage performance at the same time.

To provide a polymerizable liquid crystal composition, an optically anisotropic layer, an optical film, a polarizing plate, and an image display device, which can suppress generation of precipitates. The polymerizable liquid crystal composition of the present invention contains: a positive wavelength dispersion liquid crystal compound A having an aromatic ring with a π electron number of 10 or more; and a positive wavelength dispersion liquid crystal compound B having an aromatic ring with a π electron number of 6 or more and less than 10.

Disclosed is a polymerizable compound selected from compounds of general formula (1). In addition, it is also disclosed that when the polymerizable compound is added to a polymerizable composition, the occurrence of poor film thickness uniformity and uneven orientation is reduced. Therefore, the polymerizable compounds can be used as components of polymerizable compositions. In addition, the optically anisotropic body using the polymerizable composition containing the polymerizable compound can be used in applications such as an optical film.

The present application provides a liquid crystal composition and a liquid crystal display device thereof. The liquid crystal composition of the present application comprises at least one compound of general formula O and at least one compound of general formula B. The liquid crystal composition of the present application has smaller polymer residue, smaller roughness, better low-temperature storage stability, smaller contact angle, better alignment effect, and better pre-tilt angle stability under the condition of maintaining proper clearing point, proper optical anisotropy, proper absolute value of dielectric anisotropy, larger K value (K 11 and K 33 ) and smaller rotational viscosity, so that the liquid crystal display device comprising the same has proper threshold voltage, better contrast, better response speed, can effectively improve the problems such as "image sticking", display unevenness, "broken bright spot" and the like existing in the existing PSA type liquid crystal display, and has higher practical application value.

An optically anisotropic polymer thin film includes a crystallizable polymer and an additive configured to interact with the polymer (e.g., via π-π interactions) to facilitate chain alignment and, in some examples, create a higher crystalline content within the polymer thin film. The polymer thin film may be characterized by a bimodal molecular weight distribution where the molecular weight of the additive may be less than approximately 50% of the molecular weight of the crystallizable polymer. Example crystallizable polymers include polyethylene naphthalate, polyethylene terephthalate, polybutylene naphthalate, polybutylene terephthalate, as well as derivatives thereof. Example additives, which may occupy up to approximately 10 wt. % of the polymer thin film, include aromatic ester oligomers, aromatic amide oligomers, and polycyclic aromatic hydrocarbons, for example. The optically anisotropic polymer thin film may be characterized by a refractive index greater than approximately 1.7 and an in-plane birefringence greater than approximately 0.2.

The present invention addresses the problem of providing an image display device and AR glasses that are both capable of displaying a virtual image so as to be superimposed on a real image, are compact, and have excellent luminance uniformity of the virtual image. The image display device according to the present invention includes at least: a display element; a diffraction element including an optically anisotropic layer for changing the angular characteristics of luminous intensity in an image displayed by the display element; a beam splitter that reflects at least a portion of the image in which the angular characteristics of luminous intensity were changed by the diffraction element; and a half mirror that reflects, toward the beam splitter, at least a portion of the image reflected by the beam splitter. The optically anisotropic layer has a liquid crystal alignment pattern including a region in which the orientation of an optical axis derived from a liquid crystal compound changes while continuously rotating along at least one in-plane direction.

The invention relates to a naked-eye 3D display system based on a multi-layer phase modulation composite grating, belongs to the technical field of stereoscopic display, and aims to overcome the technical bottlenecks of low brightness of an existing parallax barrier grating, large crosstalk caused by large thickness of a cylindrical lens and serious dispersion of a diffraction element. The system comprises a two-dimensional display panel and a composite diffraction grating, pixel units of the display panel are composed of red, green and blue sub-pixel matrixes and are coded according to viewpoints. The composite diffraction grating is attached to the light emitting side of the panel, is made of an optical anisotropic material and is of a multi-layer structure, and a first micro-nano structure layer and a second micro-nano structure layer are sequentially arranged along a light path; the first layer is an aspherical focusing array, and the phase delay of the aspherical focusing array meets a quadric surface function so as to collimate light waves; the second layer is a dispersion compensation type deflection array, and the grating period of the second layer is accurately matched with the central wavelength of the sub-pixels, so that light of different colors is projected at the same deflection angle. According to the invention, full-color dispersion-free display is realized, the thickness of the device is less than 50 microns, and crosstalk is obviously reduced.

The invention provides a liquid crystal composition and an optical element, the liquid crystal composition comprises a liquid crystal main component and a chiral agent, and the addition amount of the chiral agent is 0.001-1% of the weight of the liquid crystal main component; the liquid crystal main components are prepared from the following raw materials in parts by weight: 10%-25% of a first component, 70%-80% of a second component and 5%-20% of a third component, and the sum of the parts by weight of the liquid crystal main components is 100%. The liquid crystal composition provided by the invention has relatively strong intermolecular force, provides relatively high liquid crystal anchoring energy, also has relatively low viscosity and relatively good response speed, and is beneficial to improving the liquid crystal display effect. The liquid crystal composition has stable optical anisotropy, high VHR, good reliability and thermal and light stability at the same time.

Provided are a polarizing plate and an organic EL display device which have excellent black compactness in the front direction even after an organic EL display device obtained by being affixed to an organic EL display panel is exposed to a high-temperature environment for a long period of time. This polarizing plate is provided with: a polarizer formed using a composition containing a first liquid crystal compound and a dichroic substance; and an optically anisotropic layer disposed adjacent to the polarizer and formed using a composition containing a second liquid crystal compound, in which the dichroic substance content in the polarizer is 40 mass% or less relative to the total mass of the polarizer.

A liquid crystal composition for a radio wave control element is provided. The composition serves as a material exhibiting a large refractive index anisotropy with respect to radio waves. The composition includes at least one dichroic coloring agent, with a total content of 30% by mass or more relative to the total mass of the liquid crystal composition. The liquid crystal composition exhibits high absorbance in the wavelength range of 350 to 1,000 nm, making it suitable for use in radio wave control elements requiring strong optical anisotropy and efficient absorption characteristics.

The present application provides an optically anisotropic layer having a plurality of regions with different alignment states of liquid crystal compounds in the thickness direction, and being less likely to generate peeling within the layer. The optically anisotropic layer of the present application is an optically anisotropic layer formed using a liquid crystal compound, the optically anisotropic layer containing a leveling agent, and in a distribution of secondary ion intensity originating from the leveling agent in the depth direction of the optically anisotropic layer obtained by irradiating an ion beam from one surface of the optically anisotropic layer toward the other surface while analyzing the components in the depth direction of the optically anisotropic layer by time-of-flight secondary ion mass spectrometry, a prescribed requirement is satisfied.

The present invention provides a polymerizable liquid crystal composition that improves liquid crystal alignment and suppresses alignment defects, an optically anisotropic film with improved appearance quality using the polymerizable liquid crystal composition, and optical components such as phase difference plates and diffractive optical elements using the optically anisotropic film. [Solution] A polymerizable liquid crystal composition comprising a polymerizable liquid crystal compound having at least one (meth)acryloyloxy group at one end, wherein the halogen content, as measured by X-ray fluorescence analysis (XRF), is 0.300% by mass or less relative to the total solid content of the polymerizable liquid crystal composition, and the polymerizable liquid crystal composition contains halogen, and an optically anisotropic film using the composition.

The present invention provides a liquid crystal composition and a liquid crystal display device. The liquid crystal composition comprises at least one compound of general formula I and at least one compound selected from compounds of general formula II-1 and / or general formula II-2. The liquid crystal composition provided in the present invention has an appropriate optical anisotropy, an appropriate clearing point, a lower rotational viscosity, a higher Kave value and a higher ε⊥ / Δε ratio, and has higher transmittance and contrast rate, and a remarkable low-temperature storage performance at the same time.

To provide a light irradiation device that is thin and capable of projecting an optical pattern, and a sensor using the light irradiation device.SOLUTION: A light irradiation device has a light emitting element having a plurality of light emitting portions in a plane and a liquid crystal optical element. The liquid crystal optical element has an optically anisotropic layer formed using a liquid crystal composition containing a liquid crystal compound, and the optically anisotropic layer has a liquid crystal orientation pattern in which the direction of an optical axis derived from the liquid crystal compound changes while continuously rotating along at least one direction in the plane, and when the length of a 180° rotation of the direction of the optical axis derived from the liquid crystal compound in the plane is defined as one period, the liquid crystal optical element has regions in which the length of one period is different in the liquid crystal orientation pattern.SELECTED DRAWING: None

The present invention provides a self-aligning agent and a liquid crystal composition thereof. The liquid crystal composition comprising the self aligning agent of general formula O in the present invention has a lower residue concentration, a smaller roughness, a better alignment effect as well as a better low-temperature storage stability and a better pre-tilt angle stability while maintaining an appropriate clearing point, an appropriate optical anisotropy, an appropriate absolute value of dielectric anisotropy, a larger K value (K11 and K33) and a smaller rotational viscosity.

The present application relates to a liquid crystal composition and a display panel. The liquid crystal composition comprises a liquid crystal monomer and a chiral agent, wherein the chemical structural formula of the liquid crystal monomer is as shown in formula (I); and the optical anisotropy Δn of the liquid crystal composition is greater than or equal to 0.12.

Provided are an optical laminate in which, for example, in a case of being applied to a pancake lens-type virtual reality display apparatus, light leakage can be reduced by canceling out expression of phase difference, change in phase difference, and the like caused by molding into a curved surface; an optical lens including the optical laminate; and a virtual reality display apparatus using the optical lens.The optical laminate includes a first optically anisotropic layer containing a negative birefringent resin, and a specific layer selected from the group consisting of a third optically anisotropic layer which is formed by immobilizing a uniformly aligned liquid crystal compound and a cholesteric liquid crystal layer which is formed by immobilizing a helically aligned liquid crystal compound, in which the first optically anisotropic layer and the specific layer have a curved surface portion.

Provided is a composition with which an optically anisotropic film exhibits reverse wavelength dispersibility and shows nx>nz>ny can be formed, an optically anisotropic film, an optical film, a circularly polarizing plate, and an organic EL display device. The composition includes a compound represented by Formula (1); and a rod-like compound, in which the compound represented by Formula (1) has a maximal absorption wavelength in a wavelength range of 300 nm or less, and the rod-like compound has a maximal absorption wavelength in a wavelength range of 330 nm or more.

The invention provides a perylene crystal / tungsten sulfide heterojunction material, a preparation method thereof and a nonlinear photonic device, the heterojunction material is composed of an organic semiconductor perylene crystal layer and an inorganic semiconductor tungsten sulfide layer, and the organic semiconductor perylene crystal layer and the inorganic semiconductor tungsten sulfide layer are combined through Van der Waals' force to form a surface-surface heterojunction structure. According to the structure, optical anisotropy and energy donor characteristics of perylene crystals are utilized, a WS2 layer second harmonic (SHG) signal is remarkably enhanced through dipole-dipole coupling, and the highest enhancement multiple can reach 650 times. Besides, the heterojunction material has excellent second harmonic performance and excellent light stability, and the preparation process of the heterojunction material is mild in condition and high in controllability. The heterojunction belongs to a novel material of the invention, and meanwhile, the huge application potential of the heterojunction in the nonlinear optical field is found for the first time, for example, the heterojunction can be applied to the fields of nonlinear optical frequency doubling chips, on-chip photon modulators, polarization programmable photonic devices and the like.

The invention relates to a method for inducing optical anisotropy of a crystal material through heavy ion irradiation. According to the method, ion irradiation is carried out on an area, perpendicular to the in-plane crystal orientation, of a crystal material, so that defect aggregation and a lattice strain field are introduced into the area, and ion irradiation induces refractive index changes which are different in the in-plane direction and the out-of-plane direction in the area, so that an optical anisotropic structure is formed; ions adopted in the ion irradiation are Xe31 + ion beams. By controlling the ion dosage and utilizing the structural anisotropy of the rutile crystal, differentiated refractive index changes are successfully induced in the in-plane direction and the out-of-plane direction, strong and directional optical anisotropy is achieved, and a foundation is laid for manufacturing polarization-sensitive photonic devices.

The present invention addresses the problem of providing a liquid crystal composition, an optically anisotropic layer, an optical film, a polarizing plate, and an image display device with which it is possible to form an optically anisotropic layer that is suppressed in depression and wind spots when a liquid crystal cured layer having reverse dispersibility is formed without using a compound having a polyfluoro group. This optically anisotropic layer is configured from a liquid crystal cured layer obtained by immobilizing the orientation state of a liquid crystal composition containing a reverse dispersible compound (I) represented by formula (1), at least one liquid crystal compound, and a surfactant (II) having a structure represented by formula (2) in the molecule, and satisfies the relationship of formula (3).

Provided is a transmissive liquid crystal diffraction element that can diffract different polarized light components in the same direction and can maintain a polarization state during incidence. The transmissive liquid crystal diffraction element includes: first and second optically-anisotropic layers each of which has a liquid crystal alignment pattern in which an orientation of an optical axis derived from a liquid crystal compound changes while continuously rotating in at least one in-plane direction; and two retardation layers that are disposed on a side of the second optically-anisotropic layer opposite to the first optically-anisotropic layer and between the first optically-anisotropic layer and the second optically-anisotropic layer, respectively, in which a rotation direction of the optical axis in the liquid crystal alignment pattern of the first optically-anisotropic layer is opposite to that of the second optically-anisotropic layer, a single period of the liquid crystal alignment pattern of the first optically-anisotropic layer is the same as that of the second optically-anisotropic layer, the retardation layer is a positive C-plate or an O-plate, and the positive C-plate satisfies Expression (1).0.12≤<semantics definitionURL="">❘<annotation encoding="Mathematica">"\[LeftBracketingBar]"< / annotation>< / semantics>Rth⁡(λ) / λ<semantics definitionURL="">❘<annotation encoding="Mathematica">"\[RightBracketingBar]"< / annotation>< / semantics>≤0.66(1)

Provided by a compound represented by general formula (I) and a composition, a cured product, an optically anisotropic body, an optical element and a light guide element containing the compound are a compound having high refractive index anisotropy △n and a composition, a cured product, an optically anisotropic body, an optical element and a light guide element containing the compound. P1 and P2 each independently denote a hydrogen atom or a substituent group.　S1 and S2 each independently denote a single bond or a divalent linking group.　A1 to A4 each independently denote a non-aromatic ring group, an aromatic hydrocarbon group or an aromatic heterocyclic group, each of which may have a substituent group. Multiple A3 and A4 moieties may be the same as, or different from, each other.　Z denotes a specific linking group or a single bond. Multiple Z moieties may be the same as, or different from, each other.　m1 denotes an integer between 2 and 7.

The invention provides an optically anisotropic laminate which does not generate unevenness of white turbidity even when observed under strong light and a circular polarizing plate comprising the optically anisotropic laminate. The optically anisotropic laminate is provided with a first liquid crystal phase difference film in which a polymerizable liquid crystal compound is oriented, a first adhesive layer, and a second liquid crystal phase difference film in which a polymerizable liquid crystal compound is oriented adjacent to each other in this order. The angle formed by the liquid crystal molecule orientation direction of the first liquid crystal phase difference film surface in contact with the first adhesive layer and the liquid crystal molecule orientation direction of the second liquid crystal phase difference film surface in contact with the first adhesive layer is 0 + / -10 degrees, and the thicknesses of the first liquid crystal phase difference film and the second liquid crystal phase difference film are 0.1-3 [mu] m respectively. The thickness of the first adhesive layer is 20 nm or more and 200 nm or less.

The optical anisotropic laminate of the present invention comprises at least one photocurable film stacked on an anisotropic pigment film. The anisotropic pigment film includes a pigment, a polymerizable liquid crystal compound, and a photopolymerization initiator. The photocurable film includes a curable resin and a photopolymerization initiator. The maximum absorption wavelength λ0 of the photopolymerization initiator included in the anisotropic pigment film and the maximum absorption wavelength λ1 of the photopolymerization initiator included in the photocurable film satisfy the following formula (1). The weight-average molecular weight (Mw) of the curable resin exceeds 10,000. λ0 < λ1…(1).

A beam deflector includes a first electrode layer including a plurality of line electrodes extending in a first direction and arranged parallel to each other in a second direction crossing the first direction; a second electrode layer separated from the first electrode layer by a predetermined distance to face the first electrode layer; and a deflection layer between the first electrode layer and the second electrode layer and having a plurality of optically anisotropic molecules controlled by an electric field formed between the first electrode layer and the second electrode layer. Each of the optically anisotropic molecules has an ellipse shape having a major axis and a minor axis, wherein the major axis is arranged to head for the first direction.

The invention discloses an optical anisotropic luminous solar concentrator and a preparation method thereof, and the optical anisotropic luminous solar concentrator is of a layered structure and is prepared by blade coating a halide perovskite CsPbBr3 nanowire layer on a glass substrate. The layered structure is composed of a glass substrate, an ultraviolet curing adhesive layer and at least two functional layers, and each functional layer is composed of a CsPbBr3 perovskite nanowire-polymethyl methacrylate composite light-emitting film. Under the action of the halide perovskite CsPbBr3 nanowire, the probability that fluorescence emitted by the light-emitting solar concentrator is conducted to the side edge parallel to the substrate can be greatly increased, so that the loss of an escape cone in the direction perpendicular to the substrate is reduced; meanwhile, due to the introduced optical spacing layer, the reabsorption loss of the device can be reduced, the conversion efficiency of the device is improved, the transmittance is relatively good, and the preparation cost is relatively low.

Provided are a compound represented by general formula (I), a composition containing a compound represented by general formula (I), a cured product, an optically anisotropic body, an optical element, and a light guide element. P1 and P2 each independently represent a hydrogen atom, -CN, -NCS, or a polymerizable group. Sp1 and Sp2 each independently represent a single bond or a specific linking group. Z1 represents a specific linking group. At least two instances of Z1 represent -C≡C-. The two instances of Z bonded to A2 in -Z-A2-Z- in general formula (I) do not represent -C≡C-. A1 and A2 each independently represent a specific group. The plurality of A2 may be the same or different. n represents an integer from 3 to 7.

An optical film, a polarizing plate, and an image display device, each having an optically anisotropic layer obtained by curing a polymerizable liquid crystal composition including a polymerizable liquid crystal compound (LCC) having forward wavelength dispersion and a monofunctional compound, and immobilizing an alignment state of the polymerizable LCC. The number a1 of atoms of the polymerizable LCC and the number a2 of atoms of the monofunctional compound satisfy a relationship of Expression (1): 0.2<a2 / a1<0.55; the number b1 of the rings B1 contained in the polymerizable LCC and the total number b2 of the aromatic rings Ar and the rings B2 contained in the monofunctional compound satisfy a relationship of Expression (2): b2=b1×0.5 or b2=(b1+1)×0.5.