Nippon Oil Corporation

Nippon Mitsubishi Oil Corporation

Other

Nippon Oil Company

Jx Nippon Oil Energy Corporation

Yoshihiro Kumagai

Suzushi Nishimura

Takehiro Toyooka

Tetsuya Uesaka

Kenji Hosaki

Takuya Matsumoto

Motoh Asakura

Tadahiro Kaminade

Kazuya Kobayashi

Shinji Nishikawa

Iwane Shiozaki

Madoka Takahashi

Yasushi Satoh

Shigeki Takikawa

Akira Masaki

A method for producing a substrate having a concavity and convexity pattern includes: a step for applying a sol containing a silica precursor on a substrate to form a coating film; a step for drying the coating film; a pressing step for pressing a mold having a concavity and convexity pattern against the dried coating film with a pressing roll; a step for peeling off the mold from the coating film; and a step for baking the coating film to which the concavity and convexity pattern has been transferred. The coating film is dried in the drying step so that the ratio of weight of the coating film to dried weight of the coating film is in a range of 1.4 to 8.8, the dried weight being obtained by baking the coating film at a temperature of 100 degrees Celsius. The coating film may be heated in the pressing step.

Method for producing concave-convex substrate using sol-gel method, sol used in same, method for producing organic EL element using same, and organic EL element obtained thereby

A liquid crystal display device has a liquid crystal cell, a liquid crystalline substance layer, a pair of polarizers, and an optical compensation element. The twist angle of the liquid crystal cell is set to 180 to 270 degrees. The optical compensation element has a twisted structure twisted in the opposite direction to that of the liquid crystal cell. The difference in the absolute values of the twist angles between the liquid crystal cell and the optical compensation element is from 40 to 100 degrees. The difference in retardation at a wavelength &#x3bb;=550 nm between the liquid crystal cell and the optical compensation element is from 100 to 250 nm. When the absolute values of the differences in retardation at wavelengths &#x3bb; of 400 nm and 550 nm between the liquid crystal cell and the optical compensation element are represented by &#x394;R(400) and &#x394;R(550), respectively, and the ratio D therebetween is represented by D=&#x394;R(400)/&#x394;R(550), D is within the range of 0.5 to 1.0.

Liquid crystal cell with twist angle from 180 to 270 degrees and twisted optical compensating element

A complex diffraction device, which is excellent in designability, easy in setting the diffraction angle, adaptable to size increase, and easy to handle by adding a diffraction function resulting from an uneven pattern to the diffraction device comprising a liquid crystalline layer where the helical orientation of the smectic liquid crystal phase having a helical structure is maintained.

Complex diffraction device

A transflective liquid crystal display providing a bright displayed image of high contrast in the transmission mode with less dependence on the viewing angle by combining a polarizer with an optically anisotropic element having a liquid crystal film in which a twisted nematic alignment stricture is secured to produce a circular polarizer and disposing the circular polarizer on the rear side of a transflector in the transflective liquid crystal display.

Circular polarizer and liquid crystal display

A laminated transparent structure for a reflective display which is used, for example, as a head-up display of an automotive vehicle. The laminated transparent structure comprises a glass plate. A transparent layer is bonded to the glass plate. An optical rotation film is disposed between the glass plate and the transparent layer. Additionally, a hot-melt adhesive is disposed between the optical rotation film and the glass plate to bond the optical rotation film to the glass plate.

Laminated transparent structure for reflective display

A novel optical film capable of readily vitrifying the tendency and state of liquid crystal alignment, excellent in the ability to retain the alignment state, and suitable for the application to optical elements. The film is produced from a liquid-crystal material containing as the essential ingredient a liquid-crystal polyester having structural units (A) and (B) as the essential unit, exhibiting a vitrified state at a temperature lower than the liquid-crystal transition point, and having a logarithmic viscosity number (&eegr;) of 0.04-0.4 dl/g as measured at 30&deg; C. in a phenol/tetrachloroethane solvent (60/40 by weight), wherein each X represents independently O or C&boxH;O; each Y represents independently a group selected from among F, Cl, Br and 1-4C alkyls; and n is 0 or 1.

Optical film

The present invention provides a novel liquid crystalline polyester comprising structural units represented by the following general formulae A, B, C and D: ##STR1## where X and Y are each independently H, Cl, Br or an alkyl group having 1 to 4 carbon atoms, the molar ratio of A/B is in the range from 49/1 to 20/30 and that of C/D is in the range from 10/40 to 45/5.

Growing community of inventors

Yokohama, Japan

Yoshihiro Kumagai