65 results about "Index ellipsoid" patented technology

The invention relates to a terahertz time-space resolution imaging system. The system comprises a sample placing frame, a detection crystal, a pump light generator, a terahertz light generator, a detection light generator and an imaging device, wherein the detection crystal is located at one side of an exit surface of the sample placing frame; the pump light generator is used for generating a pump light to illuminate a test sample; the terahertz light generator is used for generating a terahertz light to illuminate the test sample, illuminating the detection crystal after acquiring information of the test sample and modulating an index ellipsoid of the detection crystal; the detection light generator is used for generating a detection light to illuminate the detection crystal, detecting the index ellipsoid of the detection crystal and indirectly acquiring the information of the test sample; and the imaging device is located into a light path after the detection light passes through the detection crystal and is used for collecting a terahertz image of the test sample. According to the terahertz time-space resolution imaging system, a terahertz focal plane imaging technique is introduced into a terahertz time resolution spectral measurement system, the time-space resolution imaging measurement on a luminescent property of the test sample is realized, the four-dimensional spectral information is acquired, and the comprehensive and accurate observation on a time-space evolution process of the luminescent property of the test sample is realized.

Disclosed is a liquid crystal panel comprising a liquid crystal cell, a first polarizing plate arranged on one side of the liquid crystal cell, and a second polarizing plate arranged on the other side of the liquid crystal cell. The liquid crystal cell comprises red, green and blue color filters and a liquid crystal layer, and the liquid crystal layer has a multigap structure satisfying the following relation: dR >= dG > dB. The first polarizing plate comprises a first polarizer and a first protection layer arranged on the liquid crystal cell side of the first polarizer, and the first protection layer has an indicatrix satisfying the following relation: nx > ny >= nz. A liquid crystal display employing such a liquid crystal panel is reduced in color shift in an oblique direction, thereby having excellent image display characteristics.

It is an object of the present invention to provide a liquid crystal display panel having a high contrast ratio in a front direction.A liquid crystal panel according to an embodiment of the present invention includes: a liquid crystal cell; a first polarizing plate placed on one side of the liquid crystal cell; a second polarizing plate placed on the other side of the liquid crystal cell; and a retardation layer placed between the liquid crystal cell and the second polarizing plate. A refractive index ellipsoid of the retardation layer exhibits a relationship of n≧ny>nz; and a light transmittance (T2) of the second polarizing plate is larger than a light transmittance (T1) of the first polarizing plate. Such a liquid crystal panel has a remarkably higher contrast ratio in a front direction than that of a conventional liquid crystal panel (for example, a liquid crystal panel in which the light transmittances of two polarizing plates placed on both sides of a liquid crystal cell are the same), and shows excellent display properties.

A terahertz temporal and spatial resolution imaging system is provided. The system includes: a sample placing rack; a detection crystal, located on the exit side of the sample placing rack; a pump light generating device, for generating a pump light to irradiate the test sample; a terahertz light generating device, for generating a terahertz light to irradiate the test sample, irradiate the detection crystal after obtaining information about the test sample, and modulate an index ellipsoid of the detection crystal; a detection light generating device, for generating a detection light to irradiate the detection crystal to detect the index ellipsoid of the detection crystal, thereby indirectly obtaining the information about the test sample; and an imaging apparatus, located in an optical path after the detection light passes through the detection crystal, for collecting terahertz images of the test sample.

A liquid crystal panel of the present invention comprises a liquid crystal cell, a first polarizing plate arranged on one of both sides of the liquid crystal cell, and a second polarizing plate arranged on the other side of the liquid crystal cell, wherein the liquid crystal cell comprises red, green and blue color filters, and a liquid crystal layer. The liquid crystal layer has a multigap structure satisfying the following relationship: dR≧dG>dB. The first polarizing plate comprises a first polarizer and a first protective layer arranged on the liquid crystal cell side of the first polarizer, and in the first protective layer, the index ellipsoid thereof satisfies the following relationship: nx>ny≧nz.In a liquid crystal display having the liquid crystal panel, the color shift thereof can be made smaller in oblique directions and display characteristics can be excellent.

A liquid crystal display panel includes a liquid crystal cell, a first polarizing plate placed on one side of the liquid crystal cell, a second polarizing plate placed on the other side of the liquid crystal cell, a retardation film placed between the liquid crystal cell and the first polarizing plate, and a pressure-sensitive adhesive layer placed between the liquid crystal cell and the retardation film, wherein the first and second polarizing plates have absorption axes whose directions are substantially orthogonal to each other, the retardation film is a norbornene resin-containing stretched film and has a refractive index ellipsoid satisfying the relation nx≧nz>ny, and the pressure-sensitive adhesive layer includes a pressure-sensitive adhesive that may be produced by crosslinking a composition including a (meth)acrylate (co)polymer and a crosslinking agent including a peroxide as a main component. When the liquid crystal display panel is viewed from oblique directions, leakage of light and changes in color are small, and when the liquid crystal cell is recycled, the laminated film has a high level of easy peelability.

A liquid crystal panel according to an embodiment of the present invention includes: a liquid crystal cell; a first polarizer placed on one side of the liquid crystal cell; a second polarizer placed on another side of the liquid crystal cell; a biaxial optical element placed between the liquid crystal cell and the first polarizer; and a negative C plate placed between the second polarizer and the biaxial optical element. A direction of an absorption axis of the first polarizer is substantially perpendicular to a direction of an absorption axis of the second polarizer. A refractive index ellipsoid of the biaxial optical element has a relationship of nx>nz>ny and a direction of a slow axis of the biaxial optical element is substantially parallel to the direction of the absorption axis of the first polarizer. A refractive index ellipsoid of the negative C plate has a relationship of nx=ny>nz. A wavelength dispersion value (D1) of the biaxial optical element and a wavelength dispersion value (D2) of the negative C plate satisfy a relationship of D1≧D2.

A multilayer optical film exhibiting excellent screen contrast while suppressing color shift. A liquid crystal panel and a liquid crystal display are also provided. The multilayer optical film comprises at least a polarizer, a first optical compensation layer where an index ellipsoid has a relation of nx>ny=nz and the in-plane retardation Re1 is 80-300 nm, a second optical compensation layer wherean index ellipsoid has a relation of nz>nx=ny, and a third optical compensation layer where an index ellipsoid has a relation of nx>ny=nz and the in-plane retardation Re3 is 80-200 nm formed in thisorder, and the absorption axis of the polarizer intersects the slow axis of the first optical compensation layer perpendicularly.

The present invention provides a laminated optical film capable of contributing to thinning of each of a liquid crystal panel and a liquid crystal display apparatus and of simplifying its manufacturing steps, and a method of manufacturing the laminated optical film. The laminated optical film is used in a liquid crystal display apparatus and arranged on a viewer side of a liquid crystal cell. The laminated optical film includes: a polarizer; and a retardation layer which is arranged on one side of the polarizer, has a refractive index ellipsoid showing a relationship of nx>ny=nz, and has an in-plane retardation value Re[590] of 90 to 190 nm. An angle formed between an absorption axis of the polarizer and a slow axis of the retardation layer is 5 to 85°. The retardation layer is formed of a liquid crystal material, and the retardation layer is arranged to be closer to the viewer side than the polarizer is.

The invention provides an electromagnetic lens antenna; and the electromagnetic lens antenna comprises an aeolotropic metamaterial panel and a radiation unit, wherein the metamaterial panel has an aggregation function, and the radiation unit is positioned at a focal point of the metamaterial panel; the metamaterial panel comprises a cylindrical area and at least one barrel type area, which have the same central axis, when being looked in an incident direction of an electromagnetic wave; the refractive index in each area is symmetric relative to the central axis in a radial direction and gradually reduced with the increasing of the radius, and the variation rate of the refractive index is also gradually increased; the refractive index at the junction of the areas discontinuously varies; refractive index variation ranges of the different areas are intersected in a nonvoid way; the metamaterial panel is obtained by overlaying metamaterial sheet layers; each metamaterial sheet layer comprises a substrate and a plurality of artificial microstructures, wherein the artificial microstructures are attached to the substrate; the artificial microstructures are symmetric structures which cannot rotate 90 degrees; and extraordinary light optical axes of refraction index ellipsoids of the artificial microstructures are not vertical to each other and not parallel to the incident direction of the electromagnetic wave. Through the adoption of the electromagnetic lens antenna provided by the invention, the electromagnetic waves can be received or transmitted in an oriented way.

A display element according to the present invention is provided with a pair of substrates, at least one of which is transparent; a medium between the substrates, wherein optical anisotropy magnitude of the medium is changeable by and according to an electric field applied thereon; at least one pair of electrodes for applying, on the medium, the electric field substantially parallel to the substrates; and a shielding electrode overlapping at least a display portion of at least one of the substrates, and used for shielding the display element from static electricity.

The optical laminated film of the present invention comprises a polarizer and a retardation film laminated on one surface of the polarizer, in which the polarizer has a drawn film of a hydrophilic polymer containing a dichroic material. An in-plane birefringence index (Δnxy[1000]) of this polarizer at wavelength of 1000 nm is from 0.01 to 0.03, and the retardation film is a film such that an index ellipsoid satisfies the relation of nx>ny≧nz. The retardation film is disposed so that the slow axis direction of the retardation film is substantially orthogonal to the absorption axis direction of the above polarizer.The optical laminated film of the present invention may increase contrast ratio in the case of being used for a liquid crystal display, for example.

The invention relates to an electro-optic modulator based on gamma 51 and realization and preparation method, wherein an electro-optic crystal is partitioned into three main axes, including x1 axis, x2 axis and x3 axis ,along the partitioning surface (010); two polaroids are respectively placed at two sides of the partitioning surface (010); an included angle of 45 DEG is respectively formed between the polarization direction of one polaroid and x1axis as well as between the polarization direction of the other polaroid and x3 axis; an electric field E is applied in x1 direction by a signal source; and x'1, x'2 and x'3 are index ellipsoid main axes after the electric field E is applied along the x1 direction. In the invention, the electro-optic modulator modulates light intensity according to the modulating signal intensity and linearly varies when a phase changing caused by regulating the included angle of the two polaroids to eliminate natural double refraction is under a small-signal condition. The electro-optic modulator in which the half-wave voltage is below 0.5 V can be realized by utilizing the scheme provided by the invention.

The liquid crystal panel according to an embodiment of the present invention includes a liquid crystal cell, a first polarizing plate placed on one side of the liquid crystal cell, a second polarizing plate and a third polarizing plate placed on the other side of the liquid crystal cell in an order starting from a side of the liquid crystal cell, and a retardation plate (A) placed between the liquid crystal cell and the second polarizing plate, wherein a refractive index ellipsoid of the retardation plate (A) has a relationship of nx≧ny>nz, a difference (ΔT2−1=T2−T1) between a transmittance (T2) of the second polarizing plate and a transmittance (T1) of the first polarizing plate is larger than 0%, a difference (ΔT3−2=T3−T2) between a transmittance (T3) of the third polarizing plate and a transmittance (T2) of the second polarizing plate is 4.0% to 7.5%, and the third polarizing plate is a linearly polarized light separation type reflective polarizing plate.

The invention relates to an electromagnetic wave converging element which comprises at least one metamaterial sheet layer, wherein each sheet layer comprises a sheet-shaped nonmetal substrate, each substrate is divided into a plurality of completely-same and array-distributed cuboid substrate units, an artificial micro structure is attached on each substrate unit, the artificial micro structures on each line of substrate units have same index ellipsoids which are mutually in parallel; and the artificial micro structures on each line of substrate units have same index ellipsoids, optical axes of extraordinary light axis of the index ellipsoids are sequentially clockwise or counterclockwise rotate, and the rotation angle of the optical axis of the last extraordinary light axis in the line of substrate units relative to the optical axis of the first extraordinary light axis does not exceed 180 DEG, so that the extraordinary light axis of each line of the index ellipsoids is positioned on the same side of a normal of a center connecting line of each line of substrate units. By adopting the invention, electromagnetic wave convergence can be realized.

It is an object of the present invention to provide a liquid crystal display panel having a high contrast ratio in a front direction.A liquid crystal panel according to an embodiment of the present invention includes: a liquid crystal cell; a first polarizing plate placed on one side of the liquid crystal cell; a second polarizing plate placed on the other side of the liquid crystal cell; and a retardation layer placed between the liquid crystal cell and the second polarizing plate. A refractive index ellipsoid of the retardation layer exhibits a relationship of n≧ny>nz; and a light transmittance (T2) of the second polarizing plate is larger than a light transmittance (T1) of the first polarizing plate. Such a liquid crystal panel has a remarkably higher contrast ratio in a front direction than that of a conventional liquid crystal panel (for example, a liquid crystal panel in which the light transmittances of two polarizing plates placed on both sides of a liquid crystal cell are the same), and shows excellent display properties.

A display element according to the present invention is provided with a pair of substrates, at least one of which is transparent; a medium between the substrates, wherein optical anisotropy magnitude of the medium is changeable by and according to an electric field applied thereon; at least one pair of electrodes for applying, on the medium, the electric field substantially parallel to the substrates; and a shielding electrode overlapping at least a display portion of at least one of the substrates, and used for shielding the display element from static electricity.

Provided is an optically anisotropic film high in transparency. The film is an optically anisotropic film having a refractive index relationship of nz>nx>ny wherein: nz represents a refractive index of an index ellipsoid which the optically anisotropic film forms, the refractive index being the refractive index thereof in a direction vertical to a plane of the film; nx represents another refractive index of the index ellipsoid, the refractive index being the main refractive index thereof in a direction parallel to the plane of the film; and ny represents still another refractive index of the index ellipsoid, the refractive index being the refractive index thereof in a direction parallel to the plane of the film and perpendicular to the direction related to the refractive index nx. The film further includes a polymer of a polymerizable liquid crystal compound, and an organic modified polysiloxane.

Disclosed are an extremely thin liquid crystal panel and liquid crystal display, each of which has a high contrast ratio in an oblique direction, a little light leakage, and a small color shift in an oblique direction. Specifically disclosed is a liquid crystal panel comprising a liquid crystal cell; a first polarizer, an optical element (A) and an optical element (B) arranged on one side of the liquid crystal cell; and a second polarizer arranged on the other side of the liquid crystal cell. The optical element (A) has an index ellipsoid satisfying the relationship of nx > nz > ny and is composed of a specific polycyclic compound, while having an Nz coefficient of 0.05-0.45. The optical element (B) has an index ellipsoid satisfying the relationship of nx > nz > ny and an Nz coefficient of 0.55-0.95.

The present invention provides a thin and light-weight birefringent film having a desired Nz coefficient, such that an index ellipsoid satisfies a relationship of nx≧nz>ny.The birefringent film of the present invention contains a first acenaphtho[1,2-b]quinoxaline derivative exhibiting lyotropic liquid crystallinity and a second acenaphtho[1,2-b]quinoxaline derivative exhibiting lyotropic liquid crystallinity, wherein an index ellipsoid satisfies a relationship of nx≧nz>ny. An Nz coefficient of this birefringent film is preferably 0 to 0.5.

Provided is very thin liquid crystal panel and liquid crystal display apparatus with a high contrast ratio in an oblique direction, less light leakage, and a small color shift in an oblique direction. The liquid crystal panel of the present invention includes a liquid crystal cell, a first polarizer arranged on one side of the liquid crystal cell, a second polarizer arranged on the other side of the liquid crystal cell, a first optical element arranged between the first polarizer and the liquid crystal cell, and a second optical element arranged between the first optical element and the liquid crystal cell. The first optical element has substantially optically negative uniaxial property, and the second optical element exhibits a refractive index ellipsoid of nx > nz > ny, and is formed of one or more kinds of polycylic compound having a -SO3 M group and / or a -COOM group (M represents a counter ion).

An elastic-wave monitoring device includes an optical system which is arranged so that a circularly polarized light from a light source is incident to a measured object and a light beam from the measured object passes through a polarizing filter to a photodetector. A detection unit detects periodic fluctuation components of an output signal of the photodetector. In the elastic-wave monitoring device, the polarizing filter is arranged to have a polarization transmission axis directed to one of directions of principal axes of an ellipse formed by intersections of an index ellipsoid of the measured object and a plane perpendicular to an incidence direction of the light beam and passing through an origin of the index ellipsoid.

A liquid crystal panel of the present invention includes in the following order toward a viewer side: a first polarizer; a first optical compensation layer having a refractive index ellipsoid of nx>ny>nz and an in-plane retardation Re1 of 90 to 300 nm; a liquid crystal cell; a second optical compensation layer having a refractive index ellipsoid of nx>ny>nz and an in-plane retardation Re2 of 90 to 300 nm; and a second polarizer, wherein a total thickness direction retardation ΣRth1 to n of all the optical compensation layers and a thickness direction retardation Rthc of the liquid crystal cell satisfy the following Expression (1):−160nm<(ΣRth1 to n−Rthc)<50nm  (1).

A phase compensator having a biaxial birefringent component (40) is fabricated by oblique deposition of an inorganic material on a base plate (69). A polar angle of an evaporation path of the inorganic material is controlled in a predetermined angular range to a surface normal of the base plate (69). In the oblique deposition process, the base plate (69) is oscillated in a horizontal direction. The phase compensator is arranged such that its slow axis (L4) is perpendicular to a slow axis (L3) of tilt components (24a, 24b) in a liquid crystal panel (20), and that an index ellipsoid (41) is tilted in an opposite direction to a tilt direction of the tilt components (24a, 24b).

The application relates to a single-polarizer reflective bistable twisted nematic (BTN) liquid crystal display device comprising a liquid crystal layer of thickness d, birefringence Δn and retardation Δnd, said liquid crystal layer being situated between two substrates and between a polarizer and a reflector, said liquid crystal layer in the absence of an applied electric field having two stable uniformly twisted textures, the twists of the two stable textures differing by an angle being equal mainly to 180°, and at least one compensation layer positioned between said polarizer and said reflector, said compensation layer being composed of at least one birefringent film, said birefringent film having an optical anisotropy defined by three characteristic refractive indices nx, ny, nz, along three corresponding axis x, y, z of index ellipsoid, x and y being situated inside the substrates plane, nx and ny being called in plane indices, with nx≧ny, x being called slow axis, and z being perpendicular to the substrates plane with biaxiality parameter Nz equal to (nx−nz) / (nx−ny), characterized in that Nz lies between −∞ and ½ so that under oblique viewing the retardation of the stable texture corresponding to the dark state is compensated to improve the contrast ratio and simultaneously the retardation of the stable texture corresponding to the bright state is modified to decrease the color shift.

The application relates to a single-polarizer reflective bistable twisted nematic (BTN) liquid crystal display device comprising a liquid crystal layer of thickness d, birefringence Δn and retardation Δnd, said liquid crystal layer being situated between two substrates and between a polarizer and a reflector, said liquid crystal layer in the absence of an applied electric field having two stable uniformly twisted textures, the twists of the two stable textures differing by an angle being equal mainly to 180°, and at least one compensation layer positioned between said polarizer and said reflector, said compensation layer being composed of at least one birefringent film, said birefringent film having an optical anisotropy defined by three characteristic refractive indices nx, ny, nz, along three corresponding axis x, y, z of index ellipsoid, x and y being situated inside the substrates plane, nx and ny being called in plane indices, with nx≧ny, x being called slow axis, and z being perpendicular to the substrates plane with biaxiality parameter Nz equal to (nx−nz) / (nx−ny), characterized in that Nz lies between −∞ and ½ so that under oblique viewing the retardation of the stable texture corresponding to the dark state is compensated to improve the contrast ratio and simultaneously the retardation of the stable texture corresponding to the bright state is modified to decrease the color shift.

To provide a birefringent film of which an index ellipsoid satisfies the relationship of nx>=nz>ny and which is excellent in thinning and weight saving and can easily be produced in such a way as to satisfy a desired Nz coefficient.The birefringent film contains a first acenaphtho¢1,2-b!quinoxaline derivative showing lyotropic liquid crystallinity and a second acenaphtho¢1,2-b!quinoxaline derivative showing lyotropic liquid crystallinity, wherein an index ellipsoid thereof satisfies the relationship of nx>=nz>ny. The birefringent film preferably has an Nz coefficient of 0-0.5.

Provided is a thin birefringent film whose refractive index is three-dimensionally controlled. The present invention provides a birefringent film including at least one polycyclic compound containing a —SO3M group and / or a —COOM group having a refractive index ellipsoid satisfying a relationship represented by nx>nz>ny, in which M represents a counter ion. Since such a birefringent film has a high in-plane refractive index, the thickness thereof is sharply reduced as compared with a conventional birefringent film and a desired retardation value can be obtained.

The present invention provides a liquid crystal panel that can provide a neutral display that is free from coloring in every direction. The liquid crystal panel includes a first polarizer 14a, a second polarizer 14b, and a liquid crystal cell 13. The first polarizer 14a is arranged on the visible side of the liquid crystal cell 13 and the second polarizer 14b is arranged on the backlight side of the liquid crystal cell 13. The liquid crystal panel further includes a first retardation layer 11 and a second retardation layer 12. A refractive index ellipsoid of the first retardation layer 11 has a relationship of nx=ny>nz, and a refractive index ellipsoid of the second retardation layer 12 has a relationship of nx>ny≧nz. The first retardation layer 11 and the second retardation layer 12 are arranged between the liquid crystal cell 13 and the second polarizer 14b.