Abstract: In a heat exchanger having a plurality of fins mounted on an outer surface of a tube which is for conducting a fluid therethrough, the fins are different in fin thickness to make a first and a second fin set portion. Each of the fins of the first fin set portion has a comparatively small thickness. Each of the fins of the second fin set portion has a comparatively large thickness. The heat exchanger is placed in another fluid so that a comparatively high flow energy portion of the other fluid flows into the first fin set portion while another comparatively low flow energy portion of the other fluid flows into the second fin set portion.

Abstract: A liquid-crystal display device comprising a double-layered-type liquid-crystal cell that is composed of a first cell layer and a second cell layer, said cell containing liquid-crystal molecules with a twisted nematic orientation therein and a voltage-applying means in one of the first and second cell layers, wherein the angle of twist of the liquid-crystal molecules in the first cell layer is opposite to that of twist of the liquid-crystal molecules in the second cell layer, and the orientation of the liquid-crystal molecules in the first cell layer in the vicinity of the second cell layer is at right angles to that of the liquid-crystal molecules in the second cell layer in the vicinity of the first cell layer.

Abstract: A method of producing an aluminum or aluminum alloy heat exchanger which involves the use of an aluminum-silicon alloy brazing filler metal element bearing zinc. During brazing, a diffused zinc layer is formed on the surface of the brazed connection and on the surface of the heat exchanger core in the vicinity thereof to protect the heat exchanger against corrosion.

Abstract: A liquid crystal display device containing an X-Y matrix type liquid crystal display panel in which these are M (M>1) signal electrodes and N (N>1) scanning electrodes are arranged in a matrix. The liquid crystral display device utilizes a device which reverses the polarity of the voltage waveform applied to the liquid crystal display panel at intervals of n (1<n<N) horizontal scanning periods. The polarity reversing timing of this waveform is set randomly for a certain predetermined number of frames, for example, every two frames. The random setting of the polarity reversing timing substantially eliminates crosstalk and linear display irregularity. The polarity reversing timing is realized by a random number generator in a reversing circuit which can be attached to a conventional liquid crystal display device such that this reversing circuit can randomly reverse the conventional polarity reversal signal.

Abstract: The present invention is directed to an evaporator for an automotive air conditioning refrigeration circuit. The evaporator includes a serpentined tube through which refrigerant fluid flows, and a corrugated metal fin unit fixedly disposed between parallel planar portions of the serpentined tube. A plurality of louvers are formed through the parallel surfaces of the corrugated metal fin units. The side ends of the louvers terminate a predetermined distance away from the surfaces of the parallel planar portions of the tube. The distance is selected from a range of from over 0.5 mm to under 1.0 mm.

Abstract: A multiplex-driven liquid crystal X-Y matrix display in which the electrodes are divided into several blocks and a driving voltage is independently applied to each of the blocks. Each driving voltage has a magnitude that is different from the remaining drive voltages. The display panel is free from nonuniform or deteriorated contrast even if it has a large number of scanning electrodes. Besides, for a color display, the color balance is favorably adjusted, realizing a high quality picture image.

Abstract: A liquid-crystal composition to be used in a multiplex-driving system in a twisted nematic (TN) type liquid-crystal display devices is extremely superior in its display characteristics, and is able to meet sufficiently the demands to increase the information content of various liquid-crystal display devices of high-level multiplexing operation. The liquid-crystal composition is more considerable in its usefulness than the validity thereof in half-tone display especially when it is used in a liquid-crystal television.The liquid crystal composition having a positive dielectric anisotropy in the nematic phase, comprises each 3 wt % or more of 2-(4-alkoxyphenyl)-5-alkylpyrimidine compound and of a cyanobiphenyl compound.

Abstract: A liquid crystal composition having a positive dielectric anisotropy in the nematic phase, comprising of each 3 wt % or more of 2-(4-alkoxyphenyl)-5-alkylpyrimidine compound and of a cyanobiphenyl compound.

Abstract: A transmissive type liquid crystal display panel includes a liquid crystal cell including a liquid crystal material layer, a pair of polarizers between which the liquid crystal layer is disposed, for polarizing incident light, and an optical system disposed on a front surface of the display cell, for refracting light transmitted through the liquid crystal cell in an oblique direction having a good contrast image to an observer.

Abstract: A liquid-crystal composition to be used in a multiplex-driving system in a twisted nematic (TN) type liquid-crystal display devices of the present invention is extremely superior in its display characteristics, and is able to meet sufficiently the demands to increase the information content of various liquid-crystal display devices of high-level multiplexing operation. The liquid-crystal composition is more considerable in its usefulness than the validity thereof in half-tone display especially when it is used in a liquid-crystal television.

Abstract: A liquid crystal composition which comprises of at least one compound selected from each of the following groups of compound:the first group which consists of compounds expressed as the structural formulas, ##STR1## the second group which consists of compounds expressed as the structural formulas, ##STR2## the third group which consists of compounds expressed as the structural formulas, ##STR3## the fourth group which consists of compounds expressed as the structural formulas, ##STR4## and the fifth group which consists of compounds expressed as the structural formula, ##STR5## wherein groups R.sub.1 to R.sub.19 are all straight-chain, alkyl groups expressed as C.sub.n H.sub.2n+1 (n=1.about.7).

Abstract: A liquid crystal display with multiplex capability enhanced by decreasing the hysteresis characteristic of the liquid crystal. The hysteresis characteristic of the crystal is reduced by fixing an angle of twist of the liquid crystal molecules in the range of 270 to 315 degrees, by setting a birefringence (.DELTA.N) of the host molecules at less than or equal to 0.14 and by having a crystal layer thickness (d) of less than or equal to 7 .mu.m (.DELTA.n.multidot.d<1 .mu.m).

Abstract: There discloses a liquid-crystal display device which is effective for the display of images particularly in a TV set and in which the liquid-crystal layer contains a dopant in a specific range of quantity and insulating layer is treated with an alkoxysilane coupling agent containing a glycidoxy group.

Abstract: A liquid crystal display having a uniform transmittance in the visible light range. The display includes a polarizer and analyzer which correct a non-uniform light transmittance of a liquid crystal layer. This is accomplished by controlling an angle between polarization axes of the polarizer and the analyzer in dependence on the product of a refractive index anisotropy and a thickness of the liquid crystal layer, so that the combined transmittance of the polarizer and the analyzer is a maximum in the wavelength range from 400 nm to 500 nm. When the product is approximately 0.5 .mu.m, the angle is selected in the range from 92 to 110 degrees and when the product is approximately 1.0 .mu.m, the angle is selected in the range from 94 to 120 degrees.

Abstract: A liquid-crystal display device which is effective for the display of images particularly in a TV set and in which the liquid-crystal layer contains a dopant in a specific range of quantity and the substrates are adhered to each other and sealed by two resin layers in which the outer one is a thermoplastic polyamide and the inner one is a saturated polyester.

Abstract: A liquid crystal composition comprising a mixed phase of the six kinds of the compounds such as ##STR1## and a liquid crystal display device of the multiplex drive type such as liquid crystal television device, which uses the above composition.

Abstract: A display device includes a combined dynamic scattering mode and twisted nematic mode cell structure including at least one first display electrode oriented in a first direction and a plurality of second display electrodes in a second direction. The plurality of second display electrodes oriented are supplied with a plurality of scanning signals of sequentially shifted phases with polarity inverted at a predetermined interval of time, whereas the first electrode is supplied with frame signals indicative of information to be displayed and having polarity inverted at the predetermined interval. In order to minimize variations in the threshold level of the display device, a plurality of pulse signals having a pulse width shorter than the pulse width of said scanning signals are added to the frame signals.

Abstract: A new driving technique is disclosed for a liquid crystal display panel for displaying at least two rows of characters and a cursor line while scanning scanning lines of the panel, which technique can decrease the number of scanning lines and increases the above defined voltage margin by scanning the scanning lines each two rows at a time in a line sequential scanning fashion and skipping the scanning of a cursor line electrode in a row where a display of the cursor line is unrequired, thus ensuring good contrast and viewing angle characteristics of the panels.