550 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 discloses an appearance visual detection method and device for an electric control part of a new energy automobile. Structural stress distribution data of the electric control component are obtained and subjected to partition processing, and the surface of the electric control component is divided into a stress sensitive area and a conventional area; carrying out multi-wavelength spectrum scanning and polarization state detection on the stress sensitive area by adopting self-adaptive path planning, synchronously acquiring a polarization characteristic matrix, dual-wavelength interference data and depth spectrum data of the determined key attention area, and carrying out time domain synchronization and space registration processing to generate multi-dimensional detection characteristic data; extracting an optical anisotropy coefficient, a microcosmic deformation tensor and an interface reflection feature vector, and determining layering defect feature parameters in combination with multiple threshold judgment; and calculating local curvature distribution, an interface shear stress field and thermal stress distribution, and performing quantitative matching with the material characteristic parameters to generate quantitative evaluation indexes of the layering defects. According to the invention, accurate identification and rapid positioning of microscopic layering defects in the multi-layer composite insulation structure of the electric control component are realized.

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 present invention provides: a lens and an image display device in which ghosting is suppressed when applied to a virtual reality display device using a pancake lens; and a virtual reality display device in which ghosting is suppressed. A lens according to the present invention which has a retardation layer for converting circularly polarized light into linearly polarize light, wherein: said retardation layer includes a first optically anisotropic layer and a second optically anisotropic layer; the first optically anisotropic layer and the second optically anisotropic layer have reverse wavelength dispersibility; and at least one layer among the first optically anisotropic layer and the second optically anisotropic layer is a layer obtained by immobilizing a twist-oriented liquid crystal compound having a helical axis in the thickness direction. An image display device according to the present invention has an image display panel, an absorption-type polarizer, and said retardation layer, in this order. A virtual reality display device according to the present invention has said lens or said image display device.

According to the present invention, provided are an optical laminate which has excellent adhesiveness between two optically anisotropic layers, and in which an A plate or a layer obtained by fixing a twist-aligned liquid crystal phase, which is as an optically anisotropic layer, has excellent liquid crystal alignment properties, a polarizing plate, and an image display device. An optical laminate of the present invention has: a first optically anisotropic layer formed of a first liquid crystal compound; a second optically anisotropic layer formed of a second liquid crystal compound; and a mixed layer which is disposed between the first optically anisotropic layer and the second optically anisotropic layer and contains a component derived from the first liquid crystal compound and a component derived from the second liquid crystal compound, the first optically anisotropic layer is a C plate, the second optically anisotropic layer is an A plate or a layer obtained by fixing a twist-aligned liquid crystal phase, the mixed layer further contains a photo-alignment compound, and in an analysis of components of the optical laminate in a depth direction by time-of-flight secondary ion mass spectrometry with ion beam irradiation from a surface of the optical laminate on a first optically anisotropic layer side toward a second optically anisotropic layer side, predetermined requirements are satisfied.

The invention discloses a liquid crystal composition, the liquid crystal composition comprises one or more compounds as shown in a formula I and one or more compounds as shown in a formula II and / or a formula III, and the liquid crystal composition provided by the invention has an excellent flicker level; the liquid crystal composition disclosed by the invention has a relatively large elastic constant K11 and relatively small rotary viscosity gamma 1 on the basis of keeping proper optical anisotropy and a proper clearing point, namely the liquid crystal composition disclosed by the invention has a relatively small ratio of gamma 1 to K11, so that a liquid crystal display element and a liquid crystal display have relatively high response speed. # imgabs0 #

LCoS panels using liquid crystal (LC) media having negative dielectric anisotropy and LC media comprised therein. The liquid crystal material (LC medium) has negative dielectric anisotropy and high optical anisotropy and is particularly useful in electro-optical displays including projection systems based on vertical alignment (VA) nematic panels.

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 invention relates to the technical field of optical waveguides, and particularly provides a polarization-independent prism coupling method and a waveguide structure, an optical anisotropic material is introduced into a substrate layer, a core layer and / or a cladding in a prism coupling waveguide, and a transverse electric mode and a transverse magnetic mode in the waveguide have the same effective refractive index by adjusting the refractive index distribution of the optical anisotropic material, so that the polarization-independent prism coupling method is realized. Different polarization states in the same light beam can be coupled into an optical waveguide at the same time, prism coupling is not limited by polarization sensitivity any more, the problem that a traditional prism coupling mode is limited by phase matching constraint is solved, and light of different polarization states in the same light beam has the optimal coupling angle.

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 addresses the problem of providing a composition capable of forming an optically anisotropic film in which visibility unevenness and alignment unevenness are suppressed. A composition according to the present invention contains: a silicon-containing compound selected from the group consisting of compounds A that satisfy requirements (a1)-(a3) and compounds B that satisfy requirements (b1)-(b4); and a liquid crystal compound.　Requirement (a1): The value obtained by dividing the total number of methyl groups bound to a silicon atom within the molecule by the molecular weight of the compound is 0.0140 or more. Requirement (a2): Being represented by A-(Za1-Ya1-(Xa1)m)n. Requirement (a3): Having a molecular weight of 500-8000.　Requirement (b1): The value obtained by dividing the total number of methyl groups bound to a silicon atom within the molecule by the molecular weight of the compound is 0.0140 or more. Requirement (b2): Having two or more groups represented by -Lb1-Xb1. Requirement (b3): Having a partial structure represented by *-(Zb1-Yb1)s-Wb1. Requirement (b4): Having a molecular weight of 500-8000.

The present application provides a liquid crystal composition and a liquid crystal display device comprising same. The liquid crystal composition comprises at least one compound as represented by general formula I and at least one compound as represented by general formula II. On the basis of appropriate optical anisotropy, relatively high dielectric anisotropy, a relatively large elastic constant, a high response speed, a high transmittance and other properties being maintained, the liquid crystal composition provided in the present application also has a good Flicker value, relatively high low-temperature stability, a wider nematic phase temperature range and a better contrast ratio.

The present invention provides a polarizing plate capable of achieving low reflectance when applied to a display device, and a display device. This polarizing plate comprises: a polarizer; an optically anisotropic layer X having an in-plane retardation; and an adjacent layer X adjacent to the optically anisotropic layer X. The difference between the refractive index of the optically anisotropic layer X and the refractive index of the adjacent layer X in the transmission axis direction of the polarizer is 0.15 or less, the refractive index anisotropy Δn of the optically anisotropic layer X is 0.09 or less, and the angle formed by the transmission axis of the polarizer and the in-plane slow axis of the optically anisotropic layer X is 20° or less.

The invention discloses coated fuel particle detection equipment, which comprises a cache assembly, a detection assembly and a detection assembly, side plates are mounted on the two temporary storage tables; the two sliding rails are mounted on the left and right sides of the tops of the two temporary storage table mounting side plates; the first translation air cylinder and the second translation air cylinder are installed on the side portions and the tops of the two temporary storage table installation side plates correspondingly. The two lifting cylinders are respectively mounted on one sliding rail and the first translation cylinder; the first charging tray mounting plate is mounted on the two lifting cylinders; the second charging tray mounting plate is mounted on the second translation air cylinder and one sliding rail; the manipulator carrying assembly is suitable for carrying the metallographic sample to the image acquisition assembly; and the image acquisition assembly is suitable for acquiring a metallographic cross-section image of the metallographic sample so as to detect the thickness of the coating layer of each coated fuel particle in the metallographic sample or the optical anisotropy of the compact pyrolytic carbon layer. According to the invention, full-automatic detection of the coating layer thickness or optical anisotropy of the coated fuel particles 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.

The present invention addresses the problem of providing an optical film having excellent ultraviolet absorbency, excellent alignment properties of a liquid crystal compound in an optically anisotropic layer, and excellent adhesion between an alignment film and the optically anisotropic layer. The optical film according to the present invention comprises an alignment film and an optically anisotropic layer disposed adjacent to the alignment film, the optically anisotropic layer being formed using a composition containing a liquid crystal compound, and the alignment film containing particles containing an ultraviolet absorber and a cured product of a polymerizable compound having a polymerizable group, the average particle diameter of the particles is 500 nm or less, and the maximum absorption wavelength of the ultraviolet absorber is within the range of 320-400 nm.

The invention discloses a terahertz Airy beam generation method based on an electric control liquid crystal cubic phase plate, and belongs to the technical field of terahertz signal modulation, and the method comprises the following steps: S1, calculating a structural electrode pattern required for manufacturing the cubic phase plate; s2, carrying out photoetching on the DMSO doped PEDOT: PSS organic thin film by using a stripping process, and manufacturing a structural electrode with a cubic phase pattern; s3, manufacturing a liquid crystal cubic phase plate required for generating Airy beams by using a method of loading a vertical electric field to drive liquid crystal through a structural electrode; and S4, generating Airy beams by using the terahertz liquid crystal cubic phase plate. According to the terahertz Airy beam generation method based on the electrically-controlled liquid crystal cubic phase plate, a manufactured terahertz Airy beam generation device is short in finished product period and low in cost, has good broadband optical anisotropy and electro-optical and magneto-optical modulation characteristics, can meet the requirements for large working bandwidth and tunable performance, and has wide application prospects. And the practical application process of the terahertz imaging technology can be accelerated.

The invention relates to the technical field of liquid crystal materials, in particular to a liquid crystal composition and application thereof.The liquid crystal composition comprises one or more compounds with the structure shown in the general formula I, one or more compounds with the structure shown in the general formula II and one or more compounds with the structure shown in the general formula III, and one or more compounds with structures as shown in a general formula IV. The liquid crystal composition provided by the invention has the excellent properties of low rotary viscosity, large elastic constant, large optical anisotropy, high response speed, good low-temperature intersolubility and the like, can effectively improve the response speed of a liquid crystal display, and can be used for fast-response liquid crystal display of multiple display modes; when the liquid crystal composition is used in a VA, IPS or FFS mode display, the display effect of a liquid crystal display can be obviously improved, and the liquid crystal composition is particularly suitable for IPS and FFS mode liquid crystal displays.

Provided is a liquid crystal composition which satisfies the following requirements: a high upper-limit temperature, a low lower-limit temperature, a low viscosity, appropriate optical anisotropy, large dielectric anisotropy, a large dielectric constant in the short-axis direction, a large ratio of the dielectric constant in the short-axis direction to the dielectric anisotropy, a large specific resistance, high stability with respect to light and heat, and a high stability with respect to light and heat. The present invention relates to a liquid crystal composition, a liquid crystal display element, and a use thereof, which have at least one of the characteristics such as high elastic constant, or a suitable balance between at least two of the characteristics. A liquid crystal composition containing, as component A, a specific compound having large optical anisotropy, it is also possible to contain a specific compound having a large dielectric anisotropy as component B, a specific compound having a small viscosity or a high upper limit temperature as component C, or a specific compound having a large dielectric constant in the minor axis direction as component D.

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#

The present invention addresses the problem of providing an optical element which is capable of diffracting incident light with high diffraction efficiency. The problem is solved by an optical element which has a first optically anisotropic layer that contains a calamitic liquid crystal compound and a second optically anisotropic layer that contains a discotic liquid crystal compound, wherein the first optically anisotropic layer and the second optically anisotropic layer have a first liquid crystal alignment pattern in which the orientation of an optical axis derived from a liquid crystal compound changes while continuously rotating in at least one direction, and have a region in which the orientation of the optical axis rotates by 180° with a period that is shorter than 0.5 μm.

The invention relates to a polymerizable liquid crystal composition, an optically anisotropic film, a laminate, a polarizing plate, and an image display device. The present invention addresses the problem of providing an optically anisotropic film capable of suppressing a change in phase difference due to heat, a laminate, a polarizing plate including the optically anisotropic film, and an image display device including the optically anisotropic film and the laminate. [Solution] A polymerizable liquid crystal composition containing at least one polymerizable liquid crystal compound, the polymerizable liquid crystal composition comprising: a polymerizable liquid crystal compound having a ClogP value of 7 or more; and 3-18 parts by mass of a reactive group-containing non-liquid crystal compound having at least one reactive group selected from the group consisting of acryloyloxy groups and methacryloyloxy groups per 100 parts by mass of the total polymerizable liquid crystal compound.

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.

An optically anisotropic film which is excellent in aligning properties, light resistance, and moisture-heat resistance. The optically anisotropic film contains a liquid crystal compound or a polymer, and an aggregate of organic compounds, in which the optically anisotropic film has no absorption in a visible light region, an average value of ratios of lengths of major axes of the aggregate to lengths of minor axes of the aggregate is 2.0 or more, and an average length of the minor axes of the aggregate is 10 nm or more.

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 invention provides a phase difference plate, comprising: a first optical anisotropic layer, which is a rod-like liquid crystal compound oriented with the thickness direction as the spiral axis and having an in-plane phase difference value (Re) of substantially 1 / 2 wavelength; and a second optical anisotropic layer, which is a rod-like liquid crystal compound oriented with the thickness direction as the spiral axis and having an in-plane phase difference value (Re) of substantially 1 / 4 wavelength; wherein a third optical anisotropic layer satisfying the following formula (1) is provided between the first and second optical anisotropic layers, n x ≒ y <n z (1)(where n x and n y represents the refractive index in the direction orthogonal to the plate plane, n z Represents the refractive index in the direction perpendicular to the plate plane).

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.