Abstract: Disclosed is an LCD for displaying colour images including a liquid crystal unit for transmitting selectively light rays through pixels under the control of video signals, a video signal supply device for supplying the video signals controlling the pixels of the liquid crystal unit, a monochromatic light ray supplying device for supplying a red, green or blue light ray necessary to present colours under the control of the video signals, and a light supplying device for supplying white light to the monochromatic. The monochromatic light ray supplying device is structured so as to separate the white light provided by the light supplying device into the red, green and blue light rays which light rays are selectively supplied to the pixels of the liquid crystal unit as the video signals control the pixels of the liquid crystal unit.

Abstract: A color LCD system includes an LCD cell, a color filter, and a light collecting member. The LCD cell includes a pair of panels, a pair of transparent electrodes facing each other and being disposed on the panels, respectively, and a pair of orientation layers covering the transparent electrodes, respectively, a color filter attached to an outer face of the LCD cell and having red, green, and blue filter layers each of which has the same centerline as that of the transparent electrode. The light collecting member is disposed between the color filter and a light source to improve light effect.

Abstract: A method for gas supply pressure control is disclosed. Gas is supplied to a gas burner at a gas supply pressure which is higher than an ignition pressure, and after the ignition of the gas burner, the gas supply pressure increases during a predetermined time until fluid to be heated reaches a target temperature. The increase of the gas supply pressure is performed gradually according to a predetermined number of pressure levels set between the ignition pressure and maximum gas supply pressure of the gas boiler. If the fluid reaches the target temperature, the gas is supplied according to a corresponding to the target pressure temperature. Since the time that the gas is supplied at the maximum gas supply pressure is reduced during the time of initial operation of the gas boiler and during the operation of the gas boiler, the noise resulting from combustion is reduced.

Abstract: The present invention describes novel cyclic diol derivatives represented by formula I and II: ##STR1## in which Y represents O, S, SO, SO.sub.2, (CH.sub.2).sub.m wherein m is zero or an integer of 1 to 5, or NR.sup.2 group wherein R.sup.a is hydrogen, lower alkyl, lower alkoxycarbonyl, aryl, arylalkyl or acyl;R.sup.1 represents an alkyl or alkylcarbamoyl group;R.sup.2 represents a group having formula T--(CH.sub.2).sub.n --V (X.sup.-)q, wherein T refers to a simple covalent bond, a CO, PO.sub.3.sup.-, C(O)O, or CONR.sup.b group wherein R.sup.b is hydrogen, lower alkyl or acyl;n refers to an integer of from 1 to 10;V represents either (i) the group indicated by formula --.sup.+ NR.sup.5 R.sup.6 R.sup.7 wherein R.sup.5, R.sup.6 and R.sup.7 stands for identical or different lower alkyl group, or two or three of R.sup.5, R.sup.6 and R.sup.7 taken together with the adjacent nitrogen form heterocyclic ammonio group, or (ii) the group indicated by the formula ##STR2## wherein R.sup.

Abstract: A film type compensation cell for an LCD which compensates for the twist angle of the liquid crystal in the LCD. The compensation cell has two compensation films, having orientation grooves formed on the surfaces thereof. Liquid crystal is between the two compensation films and is twisted in an opposite direction of the liquid crystal in the LCD. Compensation cells can be manufactured by forming orientation grooves on the surfaces of the compensation films and applying a liquid crystal therebetween. The compensation films are then pressed together and cut to the requisite size.