215results about How to "High birefringence" patented technology

A light-scattering film 10 is obtained by subjecting a birefringent material in a resin layer to orientation treatment, in which at least one component selected from a transparent resin 6 and a scattering material 7 is the birefringent material (e.g., a birefringent resin, a liquid crystalline material). According to the light-scattering film, in the case where a linear polarized light in which a vibrating direction and a propagating direction exist in a plane containing a surface-directional axis of the film and a thickness-directional axis of the film is incident at a film surface, the rectilinear transmittance of the incident light shows maximum at an oblique incident direction to the film surface (e.g., incident angle of 20 to 89°). The rectilinear transmittance of the incident light from a direction perpendicular to the film surface is 0 to 30%, and the rectilinear transmittance of the incident light from an oblique direction having an incident angle of 40 to 70° to the film surface is 50 to 100%. Directivity in a light-scattering property of the light-scattering film is improved, and even when an incident light comes from an oblique direction, brightness of the display surface from a front direction is improved. Therefore, the film is useful for employing in combination with a polarized plate of the liquid crystal display apparatus.

A method for controlling positive birefringence in an optical compensation film (positive C-plate) having high positive birefringence throughout the wavelength range 400 nm<λ<800 nm is provided. The method includes selecting polymers with optically anisotropic subunits (OASUs) that exhibit the buttressing effect, wherein the OASUs may be disks, mesogens or aromatic rings substituted with birefringence enhancing substituents. The method further includes processing the polymer by solution casting to yield a polymer film with high birefringence without the need for stretching, photopolymerization, or other processes. These optical compensation films may be used in LCDs, particularly IPS-LCDs.

Optical compensation films (positive C-plate) with anisotropic subunits (OASUs) that are aromatic rings substituted with birefringence enhancing substituents (BES) and have high positive birefringence throughout the wavelength range 400 nm<λ<800 nm are provided. The optical compensation films may be processed by solution casting to yield a polymer film with high birefringence without the need for stretching, photopolymerization, or other processes. Such optical compensation films are suitable for use as a positive C-plate in LCDs, particularly IPS-LCDs.

An optical material having a high birefringence and a small absolute value of a photoelastic coefficient is provided by use of a resin composition for an optical material comprising a resin (a) having a positive photoelastic coefficient and a negative inherent birefringence and a resin (b) having a negative photoelastic coefficient and a negative inherent birefringence.

The invention relates to a compound potassium lead borophosphate nonlinear optical crystal as well as a preparation method and application thereof. The compound has the chemical formula of KPbBP2O8. The preparation method comprises the following steps of: after uniformly mixing a raw material containing K, Pb, B and P by adopting a solid-phase reaction method, heating for carrying out solid-phase reaction to obtain a compound of the potassium lead borophosphate; and growing a crystal on the compound by adopting a melt method to obtain the potassium lead borophosphate nonlinear optical crystal. The compound is the centimeter-grade large size nonlinear optical crystal of a tetragonal crystal system; a space group is I-42d; cell parameters comprise a=7.1764(7), b=7.1764(7), c=13.9483(13), Z=4 and V=718.35; the powder frequency doubling effect of the compound is equivalent to that of KDP (Potassium Dihydrogen Phosphate); the Mohs hardness is 4 to 5; and the potassium lead borophosphate nonlinear optical crystal has the advantages of easy cutting, polishing processing and storage, no deliquescence, high preparation speed, simple operation, low cost, good mechanical performance, difficult cracking, stable physicochemical property, and the like and is suitable for manufacturing an nonlinear optical device.

The invention relates to a transflective LCD, which comprises a first substrate, a second substrate opposite to the first substrate, a liquid crystal layer between the first substrate and the second substrate, a first polaroid sheet arranged on the surface of the outside of the first substrate, a second polaroid sheet arranged on the surface of the outside of the second substrate, a common electrode layer, an insulating layer, a pixel electrode layer and a second alignment layer which are arranged on the surface of the inside of the second substrate in order, and a control electrode layer and a first alignment layer which are arranged on the surface of the inside of the first substrate, wherein the common electrode layer comprises a transmittance zone and a reflective zone; the control electrode layer is positioned in a zone corresponding to the transmittance zone, and is applied with a voltage, so that the inclination angle of liquid crystal molecules corresponding to the transmittance zone is larger than that of liquid crystal molecules corresponding to the reflective zone, and the birefringence of the liquid crystal molecules corresponding to the transmittance zone is improved. The transflective LCD does not need an internal delay chip to reduce the cost.

The invention relates to the technical field of T-Hz waveguide and provides a high-birefringence sub-wavelength porous T-Hz optical fiber. An ellipse ventage structure of which the size is much smaller than the wave length is added in an optical fiber core of the high-birefringence sub-wavelength porous T-Hz optical fiber; and the invention has the sub-wavelength mode bound capability while the high birefringence is provided at the T-Hz wave band, and also has high-birefringence property in the wider T-Hz bandwidth. The high-birefringence sub-wavelength porous T-Hz optical fiber can be used for the manufacturing of a sub-wavelength size T-Hz device, thereby being applied in the fields of sensing and detection and communication of T-Hz.

The invention discloses a high-birefringence nematic phase liquid crystal material which is prepared by mixing the following components in percentage by mass: 43-63% of biphenyl cyanide compound A, 5-10% of biphenyl alkyne compound B, 1-5% of ester compound C, 4-8% of compound D, 4-11% of compound F, 2-6% of compound E and 10-30% of compound G. The seven types of compounds with different properties are mixed to achieve the optimal properties of the liquid crystal material, so that the liquid crystal material has the advantages of high birefringence value, low viscosity, high dielectric anisotropy and wide application temperature range. When being used for preparing PDLC (polymer dispersed liquid crystal) films, the material can enhance the off-state scattering intensity and electric field response speed of the PDLC film, lower the drive voltage of the PDLC film and widen the application temperature range, so that the PDLC film is more energy-saving.

The invention relates to a borate birefringent crystal for ultraviolet and deep ultraviolet. The birefringent crystal has a chemical formula Ba2Mg (B3O6)2, belongs to trigonal system, and has a space group of R-3; and a equals to 0.70528 (3) nm, and C equals to 1.65520 (9) nm, and Z equals to 12. The barium magnesium borate birefringent crystal is an aniaxial negative crystal with ne less than no, has a transmission range of 177-3000 nm and birefringence between 0.077-0.229, and is easy for cutting, grinding, polishing and storage, stable in air, and hardly deliquesced. The barium magnesium borate birefringent crystal is subjected to a self-melt spontaneous crystallization method, a melt Czochralski method or a fluxing medium method for growth; the barium magnesium borate birefringent crystal has large birefringence (no-ne = 0.077-0.229), has important application to fields of optics and communication for the production of polarized beam splitting prism.

A thermoplastic film having at least two thermoplastic resin layers laminated on each other, wherein at least the thermoplastic resin layer of the film surface and the thermoplastic resin layer of the film back each have a tilt structure in the thickness direction of the film, and in the plane including the tilt direction of the tilt structure and the film normal line, the sign of the angle, φ between the normal direction of the film surface and the tilt direction differs between the thermoplastic resin layer of the film surface and the thermoplastic resin layer of the film back, and wherein φ is from −90° to 90°.

A liquid crystal composition include a first compound (a) and a second compound (b), wherein the molecular structure formula of the first compound is represented as follows and the molecular structure formula of the second compound is represented as follows. The liquid crystal composition also includes a third compound (c) of which the molecular structure formula is represented as follows. The liquid crystal composition has high birefringence. The invention also relates to a liquid crystal lens including the liquid crystal composition.

The invention relates to a manufacturing method of new nanometer materials, in particular to a manufacturing method of a high thermal conductivity artificial graphite film. The method comprises the steps that additive acid dianhydride, diamine compounds and organic polar solvent are polymerized in a reaction still to form a polyamide acid solution at certain temperature; the polyamide acid solution, imidize accelerant, a dehydrating agent, an end-capping reagent, a microwave heating material and a nanometer black liquor material are stirred in a stirred tank, are placed on a support to be in a film shape in a tape-casting mode and then are heated and dried in an oven, and polyimide films are obtained; the obtained polyimide films serve as raw materials, and are crossed, stacked, carbonized and graphitized, and finally the high thermal conductivity artificial graphite film is obtained. The manufacturing method is advanced in process, and the obtained graphite film has high thermal conductivity performance and good bending resistance.

The invention discloses a dicyclohexyl ethylene group substituted diphenylacetylene liquid crystal compound and a preparation method thereof. The structural general formula of the dicyclohexyl ethylene group substituted diphenylacetylene liquid crystal compound is shown in the specification, wherein (F)m, (F)n and (F)x respectively represent fluorine atom substitution, m, n and x represent substitution number of the fluorine atoms and the value of m, n and x is 0 or 1, and the cyclohexyl is trans-cyclohexyl; both R and R' represent C1-C15 alkyl, C1-C15 alkenyl, C1-C15 alkoxy, C1-C15 alkenyloxy, fluoro-substituted C1-C15 alkyl or fluoro-substituted C1-C15 alkenyl. The dicyclohexyl ethylene group substituted diphenylacetylene liquid crystal compound not only has high clearing point, wide nematic phase section, large birefringence, and low optical absorption coefficient, but also has low melting point, low viscosity and good intermiscibility, and can be used in liquid crystal optical elements; the dicyclohexyl ethylene group substituted diphenylacetylene liquid crystal compound with side fluorine can also be used in a double frequency liquid crystal display mode.

The invention discloses a panda-liked high birefringence photonic crystal fiber. A pair of large air holes are respectively replaced with seven small air holes; and the transverse space among the cladding air holes is different from the horizontal space among the cladding air hole; therefore, the structural fiber has duplicate rotational symmetry; the orthogonally polarizing mode is no longer degenerated, which appears high birefringence. The panda like type of high birefringence photonic crystal fiber can maintain single mode transmission within a wide wavelength range; the birefringence of the mode is one order of magnitude higher than the birefringence of the common fiber at least. The structural fiber has low restriction consumption, large numerical aperture and adjustable dispersion. Therefore, the PCF with the structure can be used for the manufacture of the polarization maintaining fiber and the related fiber device, which are provided with suitable dispersion and polarization characteristics. The invention has very small temperature influence and good stability.

The invention belongs to the technical field of optoelectronic materials, and particularly relates to a terahertz polarization maintaining optical fiber and a manufacturing method of the terahertz polarization maintaining optical fiber. The terahertz polarization maintaining optical fiber is a medium/metal hollow optical fiber and is obtained by coating a metal film and a medium film on the inner wall of a base tube, the cross section of the terahertz polarization maintaining optical fiber is oval-shaped, and aperture size is determined according to the double refraction of a target and transmission loss, the ratio of an oval-shaped long shaft to an oval-shaped short shaft being 2:4, and the relationship between the double refraction and a normalization aperture. The optical fiber with the structure can obtain the double refraction in a 3*10<-2> mode and 2.4dB/m of absorption loss at 1THz (300mum).

Fiber structure including a core and a cladding, a central microstructure having a first plurality of longitudinal holes and which is adapted for guiding optical radiation and for birefringence in the core. Also included is a side microstructure having a second plurality of longitudinal holes is provided, wherein the side microstructure partly surrounds the central microstructure and provides a predetermined mechanical anisotropy, a pressure responsive unit for converting an isotropic pressure force to birefringence changes on the core, a lateral force responsive unit for converting a directional pressure force to birefringence changes on the core, a temperature responsive unit for converting temperature to birefringence changes on the core, and a birefringence responsive unit for converting birefringence in the core to wavelength information.

The invention discloses an elliptical cladding polarization-maintaining large-mode-area gain fiber, which, in the structure, comprises a fiber core of the elliptical cladding polarization-maintaining large-mode-area gain fiber, an inner cladding layer, an elliptical stress layer, a first outer cladding layer, a second cladding layer and a third cladding layer, wherein the inner cladding layer coats the fiber core; the elliptical stress layer coats the inner cladding layer, and the elliptical stress layer is elliptical on the cross section of the elliptical cladding polarization-maintaining large-mode-area gain fiber; the first cladding layer coats the elliptical stress layer; the second cladding layer coats the first cladding layer; and the third cladding layer coats the second cladding layer. As birefringence of the elliptical cladding polarization-maintaining fiber is directly proportional to ellipticity, deposition of a polarization-maintaining stress region only needs to be additionally added during a rod forming process, steps such as drilling are not needed, unavoidable impurities can be prevented from being introduced in a fiber pre-form rod, loss of the fiber after wire drawing can be reduced, strength of the fiber is improved, the entire forming process has simple steps, and the birefringence and pump absorption of the fiber can be improved.