181 results about "Dielectric anisotropy" patented technology

The invention discloses a liquid crystal compound, the structural formula of the liquid crystal compound is as shown in the following formula I, # imgabs0. The liquid crystal compound has large dielectric anisotropy delta epsilon, high elastic constant K, good low-temperature intersolubility, small rotary viscosity gamma 1 and large elastic constant K, the liquid crystal composition containing the liquid crystal composition has large dielectric anisotropy delta epsilon, high elastic constant K, good low-temperature intersolubility, small rotary viscosity gamma 1 and large elastic constant K, and can be used for developing liquid crystal display elements or liquid crystal displays which have high response speed and can effectively improve residual images.

LCoS panels using liquid crystal (LC) media having negative dielectric anisotropy and LC media comprised therein. The liquid crystal material (LC medium) has negative dielectric anisotropy and high optical anisotropy and is particularly useful in electro-optical displays including projection systems based on vertical alignment (VA) nematic panels.

The invention relates to the technical field of heat exchange of capacitor filling polyurethane, and particularly discloses a cooling system and method and application. According to the system, through the synergistic effect of the temperature control module and the electric field control module, a temperature difference field and an electric field are constructed for the composite heat conduction module, and dielectric anisotropy nanosheets are induced to form a highly-oriented ordered structure in a resin matrix, so that the heat conduction efficiency of the capacitor is remarkably improved, the filling concentration of the dielectric anisotropy nanosheets is reduced, and the service life of the capacitor is prolonged. And directional arrangement of the dielectric anisotropic nanosheets is realized with a relatively low electric field intensity threshold. Compared with the prior art, the scheme not only breaks through the technical bottleneck of high filling amount of the traditional heat-conducting filler, but also reduces the directional driving force provided by an electric field through a field coupling effect, shows remarkable economic benefits and engineering application values, and solves the problems that the existing heat-conducting composite system is large in filling amount and poor in synergy heat-conducting property in all directions.

The present application provides a liquid crystal composition and a liquid crystal display device comprising same. The liquid crystal composition comprises at least one compound as represented by general formula I and at least one compound as represented by general formula II. On the basis of appropriate optical anisotropy, relatively high dielectric anisotropy, a relatively large elastic constant, a high response speed, a high transmittance and other properties being maintained, the liquid crystal composition provided in the present application also has a good Flicker value, relatively high low-temperature stability, a wider nematic phase temperature range and a better contrast ratio.

The invention provides a dye liquid crystal composition, a liquid crystal dimming device containing the dye liquid crystal composition and application of the dye liquid crystal composition. The dye liquid crystal composition comprises at least one liquid crystal composition A and at least one dichroic dye, and the liquid crystal composition A comprises at least one compound as shown in a general formula I. According to the dye liquid crystal composition and the preparation method thereof, by adopting the compound with a specific structure as shown in the general formula I, the dye liquid crystal composition has a relatively high clearing point, relatively low rotary viscosity, a relatively large dielectric anisotropy absolute value, proper vertical dielectric, relatively low refractive index, relatively good low-temperature storage stability and relatively good low-temperature intersolubility; the liquid crystal dimming device containing the liquid crystal compound has the advantages of better contrast ratio, better transmittance, wider temperature application range, better stability, higher response speed and lower dispersion, and can reduce the glare phenomenon in the dimming fields of buildings, traffic and the like. # imgabs0 #

Liquid-crystalline (LC) media having positive dielectric anisotropy and liquid-crystal displays (LCDs) containing these media, especially displays addressed by an active matrix and in particular energy efficient LC displays of the TN, PSTN, STN, TN-TFT, OCB, IPS, PS-IPS, FFS, HB-FFS, XB-FFS, PS-FFS, SA-HB-FFS, SA-XB-FFS, polymer stabilised SA-HB-FFS, polymer stabilised SA-XB-FFS, positive VA or positive PS-VA type. The media have an improved long-term stability against UV radiation and elevated temperatures.

A liquid-crystal (LC) material comprising one or more compounds of the formula Ihaving negative dielectric anisotropy and the use thereof for optical, electro-optical and electronic purposes, such as for example in LC displays, in particular energy saving displays based on the ECB, IPS or FFS effect.

According to the liquid crystal composition, all components (general formulas I-IV) contain F atoms, and the limitation that only part of components of a traditional liquid crystal material contain F atoms is broken through. The problems of high transparent haze and slow low-temperature response of a negative dielectric liquid crystal material are effectively solved. A traditional fluorinated compound is easy to separate from a polycyclic structure due to non-uniform F distribution, so that the optical uniformity is poor, and low-temperature viscosity drastic increase and high-temperature molecule out-of-order are difficult to improve at the same time. Through all-component F-containing design, the dielectric anisotropy is reduced, and the negative dielectric property is endowed; meanwhile, a special space structure and uniform distribution of F atoms synergistically enhance the stability of an intermolecular interaction network, maintain a low-viscosity characteristic in a wide temperature range, inhibit abnormal rise of low-temperature viscosity so as to accelerate response and reduce delay, inhibit out-of-order arrangement of high-temperature molecules, remarkably reduce the decreasing amplitude of fog-state light transmittance and improve the fog-state light transmittance. And collaborative optimization of optical uniformity, response speed and high-temperature stability is realized.

The invention relates to a novel liquid crystal material and application thereof, a double five-membered heteroaromatic ring is used as a core structure unit of a liquid crystal molecule, so that the liquid crystal material keeps high dielectric anisotropy, and meanwhile, the rotary viscosity of the liquid crystal molecule is remarkably reduced. A polar substituent group is introduced at the tail end of a molecule, so that the electro-optical performance is further optimized, particularly, the dimming contrast ratio and the response speed are obviously improved, and the compound also has excellent damp-heat stability and can meet the requirements of application scenes such as large-area intelligent dimming windows and vehicle-mounted anti-dazzle rearview mirrors. The liquid crystal material provided by the invention not only provides excellent electro-optical performance, but also has low-voltage driving, high dimming contrast and excellent environmental stability, provides an innovative material solution for a next-generation high-speed and low-power-consumption liquid crystal display device, and has wide application prospects and good industrialization potential.

The present invention relates to the technical field of liquid crystal compounds, and in particular to a liquid crystal compound containing a polyfluorophenanthrene structure, and also to an application thereof. The liquid crystal compound provided by the present invention has a structure shown in general formula (I), and the compound has excellent properties such as high negative dielectric anisotropy, good liquid crystal mutual solubility, and relatively low rotational viscosity, and can be used to improve the performance of liquid crystal materials.

The present application provides a liquid crystal composition and a liquid crystal display device thereof. The liquid crystal composition of the present application comprises at least one compound of general formula O and at least one compound of general formula B. The liquid crystal composition of the present application has smaller polymer residue, smaller roughness, better low-temperature storage stability, smaller contact angle, better alignment effect, and better pre-tilt angle stability under the condition of maintaining proper clearing point, proper optical anisotropy, proper absolute value of dielectric anisotropy, larger K value (K 11 and K 33 ) and smaller rotational viscosity, so that the liquid crystal display device comprising the same has proper threshold voltage, better contrast, better response speed, can effectively improve the problems such as "image sticking", display unevenness, "broken bright spot" and the like existing in the existing PSA type liquid crystal display, and has higher practical application value.

A liquid-crystal (LC) material comprising a compound of formula I and a compound of formula CPY and one or more compounds of formulae IIA, IIB, IIC and IID wherein the compound of the formula CPY is excluded from the formula IIB, having negative dielectric anisotropy and the use thereof for optical, electro-optical and electronic purposes, such as for example in LC displays, in particular energy saving displays based on the ECB, IPS or FFS effect.

The present invention relates to liquid-crystalline (LC) media having positive dielectric anisotropy and to liquid-crystal displays (LCDs) containing these media, especially to displays addressed by an active matrix and in particular to LC displays of the TN, PS-TN, STN, TN-TFT, OCB, IPS, PS-IPS, FFS, HB-FFS, XB-FFS, PS-FFS, SA-HB-FFS, SA-XB-FFS, polymer stabilised SA-HB-FFS, polymer stabilised SA-XB-FFS, positive VA or positive PS-VA type.

The present invention provides a photopolymer system based on fluorinated liquid crystal, a grating device and a preparation method thereof. In the photopolymer system provided by the present invention, a mixed liquid crystal containing both nematic liquid crystal and fluorinated liquid crystal is adopted, thereby improving the polarity and dielectric anisotropy of the mixed liquid crystal material, and improving the electro-optical performance, uniformity and stability of the overall photopolymer system, so that the grating device prepared based on this photopolymer system has good optical characteristics with low haze while having a high diffraction efficiency. Specifically, in the present invention, a fluorinated biphenyl liquid crystal, a fluorinated alkyne liquid crystal and a fluorinated difluoromethoxy liquid crystal with 2-5 carbon atoms in the flexible side chain are selected, and a nematic liquid crystal with Δε not less than 10 is selected to jointly form a mixed liquid crystal, realizing the balance and optimization between the diffraction efficiency and haze performance of the photopolymer system and the grating device prepared therefrom.

The invention provides a liquid crystal compound containing a polyfluoro substituent group, a composition and application of the liquid crystal compound. The liquid crystal compound disclosed by the invention has a structure as shown in a formula I, and has relatively high negative dielectric anisotropy, good liquid crystal intersolubility and relatively low rotary viscosity. Formula I

A liquid crystal compound represented by general formula F is useful as a liquid crystal composition and as a liquid crystal display device that contains the liquid crystal composition. The liquid crystal compound has a large clearing point, large optical anisotropy and sizable or large dielectric anisotropy absolute value under the condition of maintaining a suitable rotary viscosity, enabling the liquid crystal composition that contains the compound represented by general formula F has a large optical anisotropy, small rotational viscosity, high VHR (UV) and long low-temperature storage duration under the condition of maintaining proper clearing point, proper dielectric anisotropy absolute value and proper VHR (initial), and the liquid crystal display device that contains the liquid crystal composition of the present invention has good contrast, high response speed, high reliability and good low-temperature storage stability.

The present invention provides a self-aligning agent and a liquid crystal composition thereof. The liquid crystal composition comprising the self aligning agent of general formula O in the present invention has a lower residue concentration, a smaller roughness, a better alignment effect as well as a better low-temperature storage stability and a better pre-tilt angle stability while maintaining an appropriate clearing point, an appropriate optical anisotropy, an appropriate absolute value of dielectric anisotropy, a larger K value (K11 and K33) and a smaller rotational viscosity.

The present invention relates to a liquid crystal (LC) material with negative dielectric anisotropy as defined in claim 1 and its use for optical, electro-optical and electronic purposes, for example in LC displays, in particular energy-saving displays based on the ECB, IPS or FFS effect.

The invention discloses a device and a method for measuring stress in a forming process of a large-size aviation transparent part, and relates to the technical field of polymer injection molding measurement. The device comprises a flexible substrate matched with the surface of a mold cavity, and an interdigital electrode array, a dielectric anisotropy measurement module and a polymer stress calculation module which are arranged on the flexible substrate, the interdigital electrode array is arranged in a non-uniform distribution mode, a high-density arrangement area is arranged in a stress sensitive area, and a sparse array arrangement area is arranged in a non-sensitive area; the module is used for detecting dielectric constants and calculating principal stress differences of different positions. The flexible substrate is utilized to adapt to a complex curved surface, through the non-uniform array design, global coverage of a large-size workpiece is guaranteed, meanwhile, high-resolution capture of a key area is achieved, signal crosstalk caused by global high-density arrangement is effectively avoided, and accurate, lossless and real-time measurement of the forming stress of the large-size aviation transparent part is achieved.

The invention relates to a liquid crystal (LC) material as defined in claim 1, which has a negative dielectric anisotropy, and to the use thereof for optical, electro-optical and electronic purposes, for example for LC displays, in particular energy-saving displays based on the ECB, IPS or FFS effect.

This invention relates to compounds of formula (I), and preferably to liquid crystal media having a nematic phase and negative dielectric anisotropy, comprising a) one or more compounds of formula (I) and b) one or more compounds selected from formulas (II) and (III), wherein the parameters have the meaning given in claim 1, their use in electro-optic displays, particularly in active matrix displays based on VA, ECB, PALC, FFS or IPS effects, displays of this type comprising liquid crystal media, and the use of compounds of formula (I) in stabilizing liquid crystal media comprising one or more compounds of formula (II) and one or more compounds selected from formulas (III-1) to (III-4) and B.

The present invention provides a liquid crystal composition and a liquid crystal display device. The liquid crystal composition comprises at least one compound of general formula I, at least one compound of general formula II and at least one compound of general formula III. The liquid crystal composition provided in the present invention has appropriate optical anisotropy, appropriate clearing point, appropriate absolute value of dielectric anisotropy, larger K value, smaller rotational viscosity, shorter response time, higher transmittance, higher contrast and longer low-temperature storage time. The liquid crystal display device prepared thereby has excellent performance and is suitable for fast response, high contrast VA, IPS, NFFS and other display modes.

The invention provides a liquid crystal composition and a liquid crystal display device comprising the same. The liquid crystal composition comprises at least one compound shown as a formula I and at least one compound shown as a formula II. Through the design and mutual compounding of liquid crystal components, the liquid crystal composition has a proper clearing point, optical anisotropy and dielectric anisotropy absolute value; the liquid crystal material has the advantages of higher elastic constant, lower rotary viscosity, lower ratio of the rotary viscosity to the elastic constant, higher penetration rate, higher response speed, better low-temperature storage stability, wider nematic phase temperature range and higher contrast ratio, the use effect of the liquid crystal material is favorably improved, and the application range of the liquid crystal material is widened. The method is suitable for fast-response VA, PSVA, IPS, NFFS and other display modes.

The invention relates to the technical field of liquid crystal materials, and particularly discloses a liquid crystal composition and a liquid crystal display component. The liquid crystal composition provided by the invention comprises a negative compound as shown in the formula I and a positive compound with dielectric anisotropy greater than 2, has proper refractive index anisotropy and dielectric anisotropy and higher transmittance, particularly has excellent low-temperature (-45 DEG C) storage performance and high and low-temperature change rate, can be used in a wider temperature range, and can be applied to the field of liquid crystal display devices. Compared with the prior art, the liquid crystal composition has the advantages that the liquid crystal composition can quickly respond even at a low temperature, meanwhile, the high-low temperature change rate of the liquid crystal composition is better improved through the synergistic effect of the compounds, the operating voltage change amplitude at a low temperature and the rotary viscosity change amplitude at a low temperature are reduced, and excellent reliability can be kept at a high temperature or under long-time illumination. The liquid crystal composition disclosed by the invention can be used for developing a wide-temperature liquid crystal display with high reliability and high transmittance, and is particularly suitable for displays in IPS, FFS, TN and ECB modes. I

Disclosed is a liquid crystal display panel and a liquid crystal display device. The liquid crystal display panel includes a plurality of pixels. Each pixel includes a pixel electrode, a common electrode, and a liquid crystal that rotates in a plane due to a voltage applied by the pixel electrode and the common electrode. The pixel electrode includes a linear electrode. When an initial alignment direction of a liquid crystal whose dielectric anisotropy is positive or a direction perpendicular to an initial alignment direction of a liquid crystal whose dielectric anisotropy is negative is defined as a predetermined first direction, at a boundary between pixels adjacent to each other among the plurality of pixels, a boundary line between the adjacent pixels, the linear electrode, and an end edge of the linear electrode are inclined with respect to the predetermined first direction, and the inclination directions of the boundary line, the linear electrode, and the end edge with respect to the predetermined first direction are the same.

To provide LCoS panels using liquid crystal (LC) media having negative dielectric anisotropy, and the LC media comprised therein.SOLUTION: A liquid crystal material (LC medium) disclosed herein has negative dielectric anisotropy and high optical anisotropy and is particularly useful in electro-optical displays including projection systems based on vertical alignment (VA) nematic panels.SELECTED DRAWING: Figure 1

The invention provides a liquid crystal composition and a liquid crystal display device thereof. The liquid crystal composition comprises at least one compound as shown in a general formula I and at least one compound as shown in a general formula II. The liquid crystal composition provided by the invention has the advantages that the proper clearing point, optical anisotropy and rotary viscosity are maintained; the liquid crystal composition also has the advantages of larger dielectric anisotropy absolute value, larger K value, longer low-temperature storage time, smaller polymer layer surface roughness, smaller pre-tilt angle, higher angular velocity, lower polymer residue, higher VHR and better pre-tilt angle stability. According to the present invention, the liquid crystal display device containing the liquid crystal composition has characteristics of wide temperature use range, good contrast ratio and good low-temperature intersolubility, can effectively accelerate the production process of the PSA type liquid crystal display, can improve the production efficiency, can improve the problems of image viscosity, non-uniform display and broken bright spot existing in the existing PSA type liquid crystal display, and can improve the quality of the PSA type liquid crystal display device. The practical application value is relatively high. # imgabs0 #

The invention provides a liquid crystal composition and a liquid crystal element containing the liquid crystal composition. The liquid crystal composition satisfies at least one of the following characteristics: a high upper limit temperature of the cholesterol phase, a low lower limit temperature of the cholesterol phase, low viscosity, large optical anisotropy, large dielectric anisotropy, high specific resistance, high stability to light, and high stability to heat. Appropriate spiral pitch length and low temperature dependency of the pitch length. The liquid crystal composition contains a specific compound as a component A, a specific compound as a component B, and an optically active compound as an additive X, and may contain a specific compound as a component C, a specific compound as a component D, or a specific compound as a component E.

The invention relates to a liquid crystal compound and application thereof. The liquid crystal compound provided by the invention has a structure as shown in the formula I, has a relatively long rigid main body structure, and can obviously improve the dielectric anisotropy of a liquid crystal material and improve the performance of the liquid crystal material.

The application provides a liquid crystal compound and application thereof. The liquid crystal compound has a structure as shown in formula I. The liquid crystal compound has excellent characteristics such as high dielectric anisotropy, good liquid crystal mutual solubility, low rotational viscosity and the like, and can be used to improve the performance of a liquid crystal material. Formula I