152 results about "Electrical anisotropy" patented technology

The invention provides a liquid crystal composition. The liquid crystal composition has negative dielectric anisotropy and comprises at least one compound ith a general formula I (shown in the description), at least one compound with a general formula II (shown in the description) and at least one compound with a general formula III (shown in the description). The liquid crystal composition has proper negative dielectric anisotropy, proper optical anisotropy, low viscosity and wide nematic phase temperature range. The liquid crystal composition provided by the invention is suitable for an active matrix addressing liquid crystal display in a VA (Vertical Alignment), PSVA (Polymer Stabilize Vertical Align), IPS (In Plane Switching) or TFT (Thin Film Transistor) mode. The invention further provides a liquid crystal display device containing the liquid crystal composition.

A liquid crystal composition has a negative dielectric anisotropy, and contains a specific bicyclic compound having a large optical anisotropy and a small viscosity as a first component and a specific compound having a large maximum temperature and a large dielectric anisotropy as a second component, and may contain a specific compound having a small viscosity as a third component, a specific compound having a large dielectric anisotropy as a fourth component and a specific compound having a large dielectric anisotropy as a fifth component, and a liquid crystal display device includes the composition.

The present invention relates to a liquid crystal compound which has negative dielectric anisotropy and a large absolute value thereof; and a liquid crystal display element which contains the compound as a constituent element and has a negative value of dielectric anisotropy in the vertical alignment mode, IPS, or the like. The liquid-crystal display element has a structure including a pair of substrates and a liquid crystal sandwiched therebetween, and includes at least an alignment control layer, a transparent electrode, and a polarizing plate, in which the liquid crystal includes at least one compound having a partial structure represented by general formula (A):

(wherein W¹ and W² each independently represents fluorine, chlorine, —CF₃, —CF₂H, —OCF₃, or —OCF₂H) and has negative dielectric anistropy.

The invention discloses an antenna system and belongs to the field of antennas. The antenna system comprises a grounding plate, at least one group of antenna pairs arranged on the grounding plate, anda decoupling assembly arranged on the radiating surfaces of the antenna pairs, wherein each antenna pair comprises a first antenna and a second antenna; the decoupling assembly has electric anisotropy and the electric anisotropy means that components of equivalent dielectric constants of the decoupling assembly in various directions are different; and the decoupling assembly is used for adjustingthe antenna radiation directions of the first antennas and the second antennas, wherein the isolation of the first antennas and the second antennas after adjustment is greater than that of the firstantennas and the second antennas before adjustment. According to the antenna system, the problem that the effect of reducing coupling between the antennas by using slots is poor due to the fact that amobile terminal comprises a plurality of electronic components and the slots are easily affected by peripheral electronic components is solved; and the effect of improving the isolation between the antennas and the antenna radiation efficiency is achieved through changing the antenna radiation directions of the antennas by using the decoupling assembly arranged on the radiating surfaces of the antenna pairs is achieved.

A dual-frequency bistable liquid crystal display and the liquid crystal mixture thereof includes liquid crystal cell filled with a liquid crystal mixture which contains dual-frequency liquid crystal, chiral compound, and nematic liquid crystal mixture. The liquid crystal mixture has the characteristics of both the dual-frequency liquid crystal and cholesteric liquid crystal. The dual-frequency bistable liquid crystal display is driven in a frequency modulation mode and can be switched between two optical states by taking advantage of the dielectric anisotropy of the liquid crystal, which results in a short switching time and sharp contrast between two optical states. Furthermore, the maintaining of the two optical states requires no voltage, which does not require the use of a high voltage to destabilize the helical structure of the cholesteric liquid crystal, and does not have to go through a metastable stage. Hence, power consumption and switching time are reduced.

Ultra-cold (nano-Kelvin) neutral atoms can be trapped, manipulated, and measured, using integrated current carrying micro-structures on a nearby surface (Atom Chips). This can be utilized for the realization of ultra-sensitive sensors and quantum computation devices based on the quantum mechanical properties of the trapped atoms. However, harmful processes arise from the interactions between the atoms and the nearby surface. According to the present invention these harmful processes can be highly suppressed by using electrically anisotropic materials. It is shown that time-independent trapping potential corrugation leading to fragmentation of the trapped atom cloud can be suppressed, and that time dependent noise processes arising from the coupling of atoms to the nearby surface, and leading to loss of atoms from the trap, heating and loss of coherence can be significantly reduced.

There are provided a polymerizable-compound-containing nematic liquid crystal composition which is useful as a material for a liquid crystal display and which has a negative dielectric anisotropy (Δ∈), and a liquid crystal display device using such a nematic liquid crystal composition. The polymerizable compound is polymerized without interference with generation of the pretilt angle of the liquid crystal molecules by exposure to ultraviolet in a process for producing a device, so that a PSA display device in which a proper pretilt angle is given and which has well stabilized alignment state, a high response speed, and excellent display quality with defective display being eliminated or reduced can be produced. A liquid crystal display device using the liquid crystal composition is useful as an active-matrix liquid crystal display device and can be applied to PSVA liquid crystal display devices.

The invention discloses a double-frequency bi-stable liquid crystal display and double-frequency bi-stable liquid crystal composition. The double-frequency bi-stable liquid crystal composition made by mixing double-frequency liquid crystal, chiral composition and nematic phase liquid crystal composition is poured into a liquid crystal box; through the component ratio and chemical features of the double-frequency bi-stable liquid crystal composition, the liquid crystal composition mixed has the features of both the double-frequency liquid crystal and the cholesteric phase liquid crystal, under driving of a frequency modulation mode, two optical statuses, namely focal conic texture and planar texture, can be converted through dielectric anisotropy of the liquid crystal, and an image can be displayed; thus, the double-frequency bi-stable liquid crystal display can be in the two optical statuses without voltage maintaining or decomposing the helix structure of the cholesteric phase liquid crystal through high voltage; dielectric conversion is not related to metastable state conversion, power consumption of the double-frequency bi-stable liquid crystal display is effectively reduced, and conversion time is effectively shortened.

The invention discloses a laterally tetrafluoro-substituted dibenzoheterocyclic compound and a preparation method thereof; the compound has the structural formula described in the specification, wherein in the formula, X represents O or S, l is 0 or 1, x is 0 or 2, y is 0 or 2, z is 0 or 1, R represents C2-C10 alkyl, and R' represents C2-C10 alkyl or C2-C10 alkenyl. The compound is synthesized through Suzuki coupling, reduction, fluorination, Wittig and other reactions, the yield and purity of the product are high, and the compound has large dielectric anisotropy and has wide application prospects in VA and IPS display modes.

A multi-touch detecting method is adapted for detecting touched points on a touch panel that includes first and second conductive films. The first conductive film exhibits electric anisotropy, and has a lower resistivity in a first direction. The multi-touch detecting method includes: applying a first voltage to the first conductive film; applying a second voltage greater than the first voltage to the second conductive film; measuring sequentially voltages at different measuring points of the first conductive film; obtaining a first local maximum voltage, a second local maximum voltage and a local minimum voltage from the measured voltages; determining a first location of the touched points based on a location of the measuring point corresponding to the first local maximum voltage; and determining a second location of the touched points based on a location of the measuring point corresponding to the second local maximum voltage.

A rotating element display includes a matrix having discrete regions of cells of different sizes occupied by rotatably disposed optically and electrically anisotropic elements (e.g., electrically anisotropic bichromal spheres). The regions of larger cells are occupied by larger rotating elements having a first combination of optical properties while the regions of smaller cells are occupied by smaller elements having a second combination of optical properties. The rotating elements having different combinations of optical properties are separately addressable by electromagnetic signals that cause rotation of selected optically dissimilar elements and create a desired color image. In a different aspect, a rotating element display includes a plurality of optically anisotropic rotatable elements occupying cells of a transparent matrix, in a configuration where a background color is viewable through the matrix. A color image is created using a combination of background color with optical properties of the rotating elements.

The invention discloses a liquid crystal monomer containing deuterium substitution. The general structural formula of the liquid crystal monomer containing the deuterium substitution is indicated as in formula I. The liquid crystal compound indicated by the formula I has an ordinary physical property necessary to the compound, is stable to light and heat, wide in nematic phase, good in compatibility with other compounds, low in rotation viscosity gamma 1 and large in dielectric anisotropy, and particularly when the compound is matched with similar non-deuterium-substituted liquid crystal to use, the low-temperature solubility can be improved. An important significance on developing the large refractive index gamma 1 and medium dielectric anisotropy delta sigma is realized. The liquid crystal compound containing the compound indicated by the formula I is wide in temperature range of liquid crystal phase, small in viscosity, appropriate in refractive index anisotropy and low inn starting voltage.