摘要:
A compound capable of shortening the response time of liquid crystal display elements and a composition containing the same are provided, which compound is expressed by the formula ##STR1## wherein R.sup.1 represents a linear or branched chain alkyl group or alkoxy group, each of 1C-18C; Ar represents ##STR2## wherein X represents H, halogen atom, cyano group or methyl; A represents --COO-- or --CH.sub.2 O--; R.sup.2 represents a C.sub.1 -C.sub.18 alkyl, A C.sub.2 -C.sub.18 alkanoyl, a C.sub.3 -C.sub.18 alkoxycarbonyl or a C.sub.4 -C.sub.18 2-alkoxypropanoyl; C having a symbol * attached thereonto represents asymmetric carbon atom; and when R.sup.2 represents a linear chain alkyl and A represents --COO--, Ar is not ##STR3##
摘要:
An optically active liquid crystal compound having specific features suitable to a display mode utilizing ferroelectric chiral smectic phases and particularly having a large spontaneous polarization value, and a chiral liquid crystal composition containing the compound are provided, which compound is expressed by the formula ##STR1## wherein R.sup.1 represents an alkyl group of 2 to 18 carbon atoms; R.sup.2 represents an alkyl group or alkoxy group each of 1 to 20 carbon atoms, hydrogen atom, a halogen atom or cyano group; A represents --COO-- or --OCO--; B and C each represent a single bond, ##STR2## wherein X represents hydrogen atom, a halogen atom or cyano group; and l, m and n each represent 0 or 1.
摘要:
A compound useful as a component constituting ferroelectric liquid crystal display elements and a liquid crystal composition containing the same are provided, which compound is expressed by the formula ##STR1## wherein R represents a linear or branched chain alkyl group of 1 to 20 carbon atoms and R* represents an optically active alkyl group, alkoxy group, alkoxyalkyl group, alkoxyalkoxy group, alkanoyloxyalkyl group, alkanoyloxyalkoxy group, halogenated alkyl group or halogenated alkoxy group each of 2 to 20 carbon atoms.
摘要:
A mobile station position estimation scheme for a cellular mobile communication system which is capable of estimating a position of a mobile station in a simple manner even in the general cellular mobile communication systems in which base stations are not synchronized. According to this mobile station position estimation scheme, a first signal sequence and a second signal sequence which are uniquely predetermined for the mobile station are exchanged between the mobile station and the base station, and then a position of the mobile station is estimated at one station among the base station and the mobile station, by obtaining a phase difference between the first signal sequence and the second signal sequence and calculating an estimated distance between the base station and the mobile station according to the phase difference.
摘要:
A scheme for intermittent reception of paging signals in a mobile communication system, in which each base station repeatedly transmits a frame which contains: at least one regular reception section having a plurality of paging indication regions provided in corresponding to a plurality of groups, in which a paging presence information for indicating a presence of a paging with respect to a mobile station of a group is set in a paging indication region corresponding to that group when a paging with respect to a mobile station of that group occurs; and a mobile station alerting section having a plurality of identification information setting regions provided in correspondence to a plurality of paging indication regions, in which an identification information of a mobile station called by a paging indicated by a paging indication region is set in an identification information setting region corresponding to that paging indication region. Each mobile station receives this frame by operating a receiver circuit intermittently.
摘要:
A liquid crystal compound suitable as a material for ferroelectric liquid crystal display elements and a liquid crystal composition containing the same are provided, which liquid crystal compound is an optically active-2,5-diphenylpyridine expressed by the formula (I) ##STR1## wherein one of R.sup.1 and R.sup.2 is 1-20C alkenyl, alkynyl, alkoxy, alkenyloxy or alkynyloxy and the other is an optically active group; and X and Y each independently represent H, halogen or CN and at least one of X and Y is H.
摘要:
New fluoroalkoxydiphenyl pyrimidines which are organic compounds having optically active groups, liquid crystal compositions containing the said compounds and electro-optic elements using the said compositions are provided.The compounds have the following general formula: ##STR1## wherein R.sup.1 is an alkyl or alkoxy group having 1-20 carbon atoms, a halogen atom or a cyano group, R.sup.2 is a straight-chain or branched chain alkyl group having 1-15 carbon atoms, --A-- is a group of ##STR2## X and Y independently indicate a hydrogen atom, a halogen atom or a cyano group, and * indicates that its carbon atom is an asymmetric carbon atom.
摘要:
The present invention provides optically active compounds represented by the following general formula: ##STR1## liquid crystal compositions containing the compounds, and electro optical elements using the above compositions.The compounds of the present invention are optically active compounds having characteristics suited for a ferroelectric liquid crystal composition, especially having enough spontaneous polarization to realize quick response.
摘要:
An image projection apparatus includes an image generation element to form an image using light emitted from a light source, a shift unit to shift a position of the image generation element when a pixel shift mode is set, circuitry to generate, when the pixel shift mode is set, images used for the pixel shift mode based on image data input to the image projection apparatus, perform keystone correction processing to the generated images, and cause the processed images to be projected as the image by reciprocally shifting the position of the image generation element, or to perform, when the pixel shift mode is not set, the keystone correction processing to image data input to the image projection apparatus to generate an image applied with the keystone correction processing, and project the generated image without shifting the position of the image generation element.
摘要:
A perch channel transmission and cell selection method for a CDMA mobile communication system which is capable increasing a system capacity by reducing an amount of interference power. In this method, each base station intermittently transmits a perch channel which is spread by using a spread code assigned to each base station. Then, a mobile station receives more than one perch channels transmitted from more than one base stations, measures a receiving level of an intermittently transmitted portion of each received perch channel, and judges a located cell according to measured receiving levels of these more than one perch channels.