137results about How to "High degree of polarization" patented technology

A polarizing sheet (A) includes a polarizing film ( 2 ) and cellulose triacetate films ( 6, 6 ') bonded to opposing surfaces of the polarizing film ( 2 ) with adhesive layers ( 4, 4 ') interposed, respectively. A thermoplastic film ( 10 ) is stacked on the exposed surface of one ( 6 ') of the cellulose triacetate films. Another cellulose triacetate film ( 14 ) free of an ultraviolet absorber is bonded to the exposed surface of the other cellulose triacetate film ( 6 ) of the polarizing sheet with an adhesive ( 12 ) containing an organic photochromic compound, to thereby form a laminate sheet. The laminate sheet is placed in an injection mold, and a molding resin material fusible with the thermoplastic film ( 10 ) is injected over the thermoplastic film.

The present invention relates to a high ultraviolet transmitting double wire grid polarizer for fabricating a photo-alignment layer and a fabrication method thereof for improving the fabrication efficiency of the photo-alignment layer. More specifically, the invention provides a high ultraviolet transmitting double wire grid polarizer comprising: a substrate; a reflection preventing layer which is formed on the substrate; a patterned photosensitive material layer which is formed on the reflection preventing layer; and double metal thin film layers which are respectively formed on the photosensitive material layer and the reflection preventing layer. Further, the invention provides a fabrication method of a high ultraviolet transmitting double wire grid polarizer, the method comprises the steps of: forming a reflection preventing layer on a substrate; forming a photo sensitive material layer by applying photoresist to the top of the reflection preventing layer; forming a wire grid pattern by developing the photosensitive material layer after selectively exposing the photosensitive material layer according to a pattern that is formed by the laser interference light; and depositing metal on the wire grid pattern. Thus, the invention smoothly forms a wire grid by using the reflection preventing layer when the double wire grid polarizer is fabricated, and cuts down the production cost with no need to perform a dry etching process since the metal is deposited after the wire grid of the photosensitive material layer is formed. Further, compared with the existing single wire grid polarizer, the invention improves transmittance and polarization of the ultraviolet region, thereby enhancing the efficiency of the fabrication process of the photo-alignment layer.

The invention provides an efficient polarization purifying device. The efficient polarization purifying device is composed of a wave plate heap, a quarter-wave plate and a reflector, wherein the wave plate heap is arranged obliquely, an Brewster angle is formed between the surface normal of the wave plate heap and the horizontal direction, then parallel light emitted by a laser can enter the wave plate heap with the Brewster angle, S polarized light is reflected, P polarized light is transmitted, and the quarter-wave plate is placed in the direction of S reflected light to enable the reflected S polarized light to shine on the quarter-wave plate vertically and the included angle between an optical axis and the horizontal direction to be 45 degrees; the reflector is placed behind the quarter-wave plate, the S polarized light is converted into the P polarized light after passing through the quarter-wave plate and the reflector, and then the P polarized light enters the wave plate heap with the Brewster angle. According to the efficient polarization purifying device, due to the fact that the reflector which is perpendicular to the wave plate heap is placed on the edge of the direction of emergent light formed after the reflected light passes through the wave plate heap, the emergent light is right in the horizontal direction; an extremely small number of elements are used, and single-direction-line polarized light with the high polarization degree, high polarization purity and high energy utilization rate is obtained.

The adhesive composition for optical films containing a (meth)acrylic polymer of 300,000-1,200,000 weight average molecular weight on gel permeation chromatography obtained by copolymerizing as monomer units 30-98.9 weight% of alkyl (meth)acrylate, 1-50 weight% of polymerizable aromatic ring-containing monomer, 0.1-20 weight% of hydroxyl group-containing monomer, and 0-4 weight% of carboxyl group-containing monomer, is characterized in that the (meth)acrylic polymer does not contain carboxyl group-containing monomers as monomer units, the content of solids is 20 weight% or more, and the solvent content is 80 weight% or less.

Provided is a wire grid type polarizer having a high polarization degree, a high p-polarized light transmission efficiency, and a low backside surface s-polarized light reflection coefficient, and also provided is a method for manufacturing the wire grid type polarizer. The wire grid type polarizer (10) has: a light-transmissive substrate (14), on the surface of which a plurality of protruded rims (12) are formed in parallel with each other at a predetermined pitch with flat portions (13) formed in between, the protruded rims (12) having a width gradually decreasing from the bottom to the top; and a first metal layer (20) formed of a metal coated on side surfaces of the protruded rims (12), wherein the maximum value of the coated thickness extending from the position corresponding to half the height of the protruded rims (12) to the bottom is smaller than the maximum value of the coated thickness extending from the position corresponding to half the height of the protruded rims (12) to the top portion (19). In the manufacturing method, the first metal layer (20) is formed in such a way that the metal is deposited on the side of a first side surface (16) from a direction forming an angle satisfying the equation tan([theta]<R>1+-10)=(Pp-Dpb / 2) / Hp and then the metal is deposited from a direction forming an angle satisfying the condition [theta]<R>1+5<=[theta]<R>2<=[theta]<R>1+25..

Disclosed is an optical film having excellent optical characteristics such as low haze value, excellent transparency, high visible light transmittance and low birefringence, which is further excellent in water vapor permeability and ultraviolet absorption. Also disclosed are a polarizing plate using such an optical film, and an image display device using such a polarizing plate. Specifically disclosed is an optical film for polarizer protective films, which is composed of a polypropylene resin mixture mainly containing a polypropylene resin synthesized by a metallocene catalyst and also containing a benzotriazole compound. The benzotriazole compound is contained in an amount of 0.08-5.5% by mass relative to the polypropylene resin mixture. Also specifically disclosed is a polarizing plate obtained by forming such an optical film on at least one side of a polarizer. Further specifically disclosed is an image display device using such a polarizing plate.

A uniaxially stretched multi-layer laminate film that exhibits a high polarization performance of 99.5% or more in a simpler configuration than before, a polarizing plate that is composed of the same, an optical member for a liquid crystal display device, and a liquid crystal display device are provided. Namely, in the uniaxially stretched multi-layer laminate film in which a first layer and a second layer are alternately laminated, the uniaxially stretched multi-layer laminate film includes an intermediate layer that has a thickness of 2 μm or more and 30 μm or less; the first layer is composed of a polyester containing a naphthalene dicarboxylic acid ester; the second layer is composed of a copolymer polyester and is an optically isotropic layer that has an average refractive index of 1.50 or more and 1.60 or less; the first layer, the second layer, both first and second layers, or the intermediate layer contains a visible light absorbent, which has a weight loss of less than 10% when it is kept at 300° C. for 1 hour, in an amount of 200 ppm or more and 2500 ppm or less on the basis of the weight of the layer; the uniaxially stretched multi-layer laminate film has a polarization degree of 99.5 or more; and the average transmittance Ts for S-polarized light in a wavelength range of 400 nm to 800 nm is 60% or more.