271 results about "Optical anisotropy" patented technology

The invention discloses a quartzite surface defect detection method, system and device, and relates to the technical field of image processing, and the method comprises the following steps: fixing a to-be-detected quartzite on a detection platform, and carrying out preprocessing; constructing a double-path polarization imaging light path; polarization parameter optimization is carried out based on the optical anisotropy characteristic of quartz stone, so that a polarization state difference is generated between a defect area and a normal area; under the condition of polarization parameter optimization, synchronously acquiring a first polarization image and a second polarization image through a double-path polarization imaging light path; performing polarization difference calculation on the first polarization image and the second polarization image to generate a polarization difference image; and carrying out contrast enhancement processing on the polarization difference image, identifying a defect area, carrying out defect classification, and outputting a quartz stone surface defect detection result. By optimizing polarization imaging parameter configuration and combining image processing, high-precision detection and intelligent classification of quartz stone surface defects are achieved, and the automation level and reliability of detection are improved.

The invention relates to the technical field of image data processing, and discloses a method for detecting impurities in metal powder based on image recognition, which comprises the following steps of: irradiating the metal powder by using polarized light, synchronously acquiring an orthogonal polarization component image of the reflected light, and realizing impurity detection by calculating a differential image. Qualified powder spontaneously forms a uniform dark field in a differential image by utilizing the essential difference of response of metal powder and impurities to polarized light, and the impurities generate remarkable signals due to optical anisotropy, so that the detection blind area of the traditional method on the microscopic impurities is broken through, the method further performs time sequence analysis by multiplexing total luminous flux data, and the detection accuracy is improved. Synchronous identification of impurity morphological characteristics is realized, component and morphological two-dimensional detection capability is formed, the system realizes adaptive threshold adjustment based on statistical characteristics of differential images, and long-term operation stability is ensured.

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.

An apparatus is provided. The apparatus includes a light guide configured to guide a first light to propagate in the light guide. The device also includes an optical film coupled with the light guide, the optically anisotropic molecules in the optical film being configured with an in-plane orientation pattern having an in-plane pitch along a predetermined in-plane direction. Azimuth angles of the optically anisotropic molecules are configured to vary non-linearly in a predetermined in-plane direction within in-plane pitches of the in-plane orientation pattern. The optical film is configured to diffract the first light into a plurality of second light at a plurality of predetermined different diffraction efficiencies at a plurality of positions of the optical film.

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.

The invention discloses an image-based suspension bridge surface anomaly measurement method and measurement system, and relates to the technical field of optical measurement and image processing. The method comprises the following steps: projecting a first polarization grating and a second polarization grating with mutually orthogonal polarization directions to a to-be-measured area of the suspension bridge in a time-sharing manner; polarization information of reflected light is collected by adopting a polarization state imaging unit, and corresponding first and second Moire phase diagrams are generated. The data processing unit further performs double-path parallel processing on the two Moire phase diagrams: on one hand, a two-dimensional inclined field representing the macroscopic contour of an object is solved through a joint solution algorithm; and on the other hand, through differential operation, microscopic optical anisotropy abnormal points caused by material stress, damage and the like are identified and positioned by utilizing symmetrical response of the optical isotropic surface to the orthogonal grating. The method realizes synchronous decoupling of geometric and physical characteristics from a single data source through one-time measurement, has the advantages of non-contact and high efficiency, and is suitable for precise detection of large-scale structures such as a suspension bridge and the like.

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

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.

Provided is a method for producing an optically anisotropic layer, with a polarizer, which has a plurality of regions in which alignment states of a liquid crystal compound are fixed and different from one another; laminate, with a polarizer; and a composition. The method includes: 1) forming a composition layer containing a chiral agent containing at least a photosensitive chiral agent and a polymerizable liquid crystal compound on a substrate, 2) subjecting the composition layer to a heat treatment, 3) subjecting the composition layer to light irradiation under oxygen concentration of 1% by volume or more, after step 2), and 4) subjecting the composition layer to a curing treatment to form an optically anisotropic layer, and 5) carrying out step 3) under heating conditions, or subjecting the composition layer to a heat treatment between step 3) and step 4), with a predetermined amount of chiral agent.

The present invention relates to an intrinsically polarized light detector comprising an optically active layer comprising a blended structure of a polymer donor and a small molecule acceptor, wherein the optically active layer exhibits anisotropy. The disclosed intrinsically polarized light detector based on a non-fullerene organic conjugated small molecule achieves simultaneous directional alignment of the polymer donor and the non-fullerene organic conjugated small molecule acceptor in the blended film, achieving optical anisotropy within their respective absorption spectrum bands. This enables the intrinsically polarized light detector to detect polarized light within the absorption spectrum bands of the two, filling a current research gap. Furthermore, the detector has the advantages of a simple structure, easy preparation, tunable response light, low energy consumption, room-temperature operation, and low cost, and holds great promise for future applications in complex, compact, integrated, and space-based detection and imaging systems.

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.

A liquid crystal composition used for forming an optically anisotropic film having excellent amine resistance, and an optically anisotropic film, an optical film, a polarizing plate, an image display apparatus, and a polymerizable compound. The liquid crystal composition contains a first polymerizable compound represented by Formula (1) and a second polymerizable compound represented by Formula (2), in which a content of the second polymerizable compound is 1% by mass or more with respect to a total mass of the first polymerizable compound and the second polymerizable compound.

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

A liquid crystal compound represented by general formula F is useful as a liquid crystal composition and as a liquid crystal display device that contains the liquid crystal composition. The liquid crystal compound has a large clearing point, large optical anisotropy and sizable or large dielectric anisotropy absolute value under the condition of maintaining a suitable rotary viscosity, enabling the liquid crystal composition that contains the compound represented by general formula F has a large optical anisotropy, small rotational viscosity, high VHR (UV) and long low-temperature storage duration under the condition of maintaining proper clearing point, proper dielectric anisotropy absolute value and proper VHR (initial), and the liquid crystal display device that contains the liquid crystal composition of the present invention has good contrast, high response speed, high reliability and good low-temperature storage stability.

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.

An object is to provide a liquid crystal diffraction element having excellent diffraction efficiency and an optical device including the liquid crystal diffraction element. The object is achieved by a liquid crystal diffraction element including an optically-anisotropic layer containing a liquid crystal compound, in which the optically-anisotropic layer has a liquid crystal alignment pattern in which an orientation of an optical axis derived from the liquid crystal compound changes while continuously rotating in at least one in-plane direction, a region where the liquid crystal compound has a tilt angle is provided, and a region where the tilt angle varies in a plane is provided.

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.