123 results about "Rotational viscosity" 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.

The embodiment of the invention discloses a compound, a liquid crystal composition and application thereof, relates to the technical field of liquid crystals, and is used for solving the technical problem that the service life of electronic equipment is short due to the fact that a liquid crystal material is poor in material performance and high in material performance attenuation speed. The compound has a structure as shown in a formula (I). # imgabs0 # wherein X1 and X2 are each independently selected from the group consisting of hydrogen, deuterium, tritium, at least one halogen, and at least one hydrocarbyl group, and at least one of X1 and X2 is not hydrogen. The compound has higher birefringence, better dielectric anisotropy, lower rotary viscosity, higher clearing point, better low-temperature stability and the like, and when the compound is used as a liquid crystal compound, the performance degradation speed of a liquid crystal material is slow, so that the service life of electronic equipment can be prolonged.

The invention discloses a liquid crystal composition, the liquid crystal composition comprises one or more compounds as shown in a formula I and one or more compounds as shown in a formula II and / or a formula III, and the liquid crystal composition provided by the invention has an excellent flicker level; the liquid crystal composition disclosed by the invention has a relatively large elastic constant K11 and relatively small rotary viscosity gamma 1 on the basis of keeping proper optical anisotropy and a proper clearing point, namely the liquid crystal composition disclosed by the invention has a relatively small ratio of gamma 1 to K11, so that a liquid crystal display element and a liquid crystal display have relatively high response speed. # imgabs0 #

A liquid crystal composition and a liquid crystal display device having a rotational viscosity lower than that of conventional liquid crystal compositions. [Solution] The liquid crystal display device includes at least 5 to 50% of a first composition and 40 to 80% of a second composition, and has a dielectric anisotropy at 25°C of -2.0 to -3.9, the first composition including one or more compounds represented by structural formulas (1-1) and (1-2), JPEG0007671095000018.jpg2568 (In the formula, R 1 represents an alkyl group (C=1-5) or an alkenyl group (C=2-5), R 2 represents an alkyl group (C=1 to 4) or an alkenyl group (C=2 to 4). The second composition is, for example, a liquid crystal composition containing one or more compounds having the following structural formula: JPEG0007671095000019.jpg29113

The invention discloses a liquid crystal compound containing 2, 4, 5-trifluorobenzene, a preparation method and a composition thereof. The structure of the compound disclosed by the invention is shown as a general formula I; and the liquid crystal composition disclosed by the invention comprises the liquid crystal compound disclosed as the general formula I. The liquid crystal compound has the advantages of low dielectric loss, good light stability, wide nematic liquid crystal phase, high birefringence, low viscosity, good low-temperature intermiscibility and the like. The composition based on the liquid crystal compound provided by the invention obtains relatively high dielectric tuning rate, extremely low dielectric loss and low rotary viscosity under high frequency; and the material has the advantages of good light stability, large birefringence, wide working temperature range and the like. The liquid crystal composition provided by the invention has the characteristics of large birefringence, low viscosity and the like, so that the liquid crystal composition is suitable for manufacturing liquid crystal optical elements and high-frequency assemblies. # imgabs0 #

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 and at least one compound selected from compounds of general formula II-1 and / or general formula II-2. The liquid crystal composition provided in the present invention has an appropriate optical anisotropy, an appropriate clearing point, a lower rotational viscosity, a higher Kave value and a higher ε⊥ / Δε ratio, and has higher transmittance and contrast rate, and a remarkable low-temperature storage performance at the same time.

The invention relates to the technical field of liquid crystal materials, in particular to a liquid crystal composition and application thereof.The liquid crystal composition comprises one or more compounds with the structure shown in the general formula I, one or more compounds with the structure shown in the general formula II and one or more compounds with the structure shown in the general formula III, and one or more compounds with structures as shown in a general formula IV. The liquid crystal composition provided by the invention has the excellent properties of low rotary viscosity, large elastic constant, large optical anisotropy, high response speed, good low-temperature intersolubility and the like, can effectively improve the response speed of a liquid crystal display, and can be used for fast-response liquid crystal display of multiple display modes; when the liquid crystal composition is used in a VA, IPS or FFS mode display, the display effect of a liquid crystal display can be obviously improved, and the liquid crystal composition is particularly suitable for IPS and FFS mode liquid crystal displays.

The present invention discloses a liquid crystal composition with high transmittance and a liquid crystal display device thereof. The liquid crystal composition of the present invention 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 present invention also discloses a liquid crystal display device comprising the liquid crystal composition. While maintaining appropriate rotational viscosity, optical anisotropy, and clearing point, the liquid crystal composition of the present invention also has a large average elastic constant. The liquid crystal molecules of the liquid crystal composition exhibit good order, a large perpendicular dielectric to dielectric ratio, and high transmittance. As a result, the liquid crystal display device comprising the composition has a faster response speed, higher contrast and transmittance, a lower threshold voltage, and reduced energy consumption of the liquid crystal display device. The composition is a liquid crystal material with better overall performance and is particularly suitable for liquid crystal display devices in display modes such as IPS. #imgabs0#

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.

The present invention relates to a dielectric negative liquid crystal composition and a display device thereof, belonging to the field of liquid crystal materials. The liquid crystal composition comprises at least one dielectric negative compound represented by general formula I: at least one compound represented by general formula F: at least one dielectric negative compound M, compound M is selected from the compounds represented by the following general formula M: and at least one compound represented by general formula III: The liquid crystal composition of the present invention has a large ε ∥ , thus having a larger liquid crystal capacitance, and also having a larger ε ⊥ , with a higher ε ⊥ / |Δε| ratio, having high transmittance and contrast. The prepared PSVA mixture has good pre-tilt angle forming ability, and the formed pre-tilt angle has good stability. At the same time, the liquid crystal composition of the present invention has good low-temperature storage stability and low rotational viscosity, and can reduce the response time of the liquid crystal display.

The present invention relates to the field of oil and gas drilling, and in particular to a rotational viscometer suitable for different gas solubilities and temperatures and pressures and a method for using the same. The technical solution is: a rotor is installed in the inner cavity of a rotational viscosity measuring kettle, a suspension is installed above the rotor, the upper end of the suspension is connected to a return spring and an induction magnet, and a magnetic sensor is provided above the induction magnet; a bottom transmission magnet is provided at the bottom, a water bath cooling pipeline and a heating pipeline are provided on the outside, a high-pressure pipeline connection port is installed on the upper side, and the high-pressure pipeline connection port is connected to an air pump and a hydraulic oil storage tank through a high-pressure gas pipeline. The beneficial effect is: the present invention delivers high-pressure contaminated gas to the inner cavity of the rotational viscosity measuring kettle, thereby melting a target amount of contaminated gas into the liquid sample, and then drives the drilling fluid sample to rotate through the rotor, driving the suspension and the induction magnet to rotate; the rotational viscosity parameters of the drilling fluid are measured under specific temperature and pressure conditions and certain gas solubility conditions.

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 and at least one compound selected from compounds of general formula II-1 and / or general formula II-2. The liquid crystal composition provided in the present invention has an appropriate optical anisotropy, an appropriate clearing point, a lower rotational viscosity, a higher Kave value and a higher ε⊥ / Δε ratio, and has higher transmittance and contrast rate, and a remarkable low-temperature storage performance at the same time.

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 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

The subject of the present invention is to provide a liquid crystal composition having a liquid crystal phase in a wide temperature range, high refractive index anisotropy, high absolute value of dielectric constant anisotropy, low viscosity or rotational viscosity, good solubility at low temperature, high resistivity and voltage holding rate, thermal and light stability, and negative Δε; further, by using the liquid crystal composition, a high-speed response liquid crystal display element such as VA type and PSVA type with excellent display quality and less prone to display defects such as drip marks and line afterimages is provided. The inventors have studied various liquid crystal compounds and various chemical substances and found that by combining specific compounds, the aforementioned problems can be solved and a liquid crystal display element using the liquid crystal composition can be provided.

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 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

The present invention provides a liquid crystal composition and a liquid crystal display device comprising the same, wherein the liquid crystal composition comprises at least one compound of formula I and at least one compound of formula II. Through the selection and compounding of components, the liquid crystal composition has a higher clearing point, appropriate optical anisotropy, appropriate dielectric anisotropy, lower rotational viscosity, a larger elastic constant K value, a shorter response time and a faster response speed, a smaller dark state transmittance, a larger bright state transmittance and a higher contrast, so that the liquid crystal display device comprising the same has a better contrast, a higher transmittance, a faster response speed, a shorter refresh time and a wider operating temperature range, which helps to significantly improve the display effect of the liquid crystal display and is suitable for display modes such as VA, PSVA, IPS, and NFFS.

The present disclosure relates to a liquid crystal compound, a preparation method therefor, and a use thereof. The liquid crystal compound provided by the present disclosure has relatively large negative dielectric anisotropy and the characteristics of high clearing point, relatively high optical anisotropy, moderate rotational viscosity, and liquid crystal miscibility, exhibits excellent low-temperature working effect, and shows good properties such as thermal stability, chemical stability, optical stability, and mechanical properties. Therefore, the driving voltage of a liquid crystal display device in which the liquid crystal compound is used can be effectively reduced, the response speed of the liquid crystal display device is increased, and the liquid crystal display device has the characteristics of moderate optical anisotropy numerical value, high charge retention rate, etc.

The invention provides a liquid crystal composition, a liquid crystal display device containing the liquid crystal composition and application of the liquid crystal display device. 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. According to the liquid crystal composition disclosed by the invention, through mutual compounding of specific structures and contents of the compounds, the liquid crystal composition has relatively large elastic constant, relatively high penetration rate, relatively small rotary viscosity and relatively good Flicker value on the basis of maintaining proper dielectric anisotropy, relatively good optical anisotropy and relatively good clearing point; the performance advantages of a compound containing a cyclohexene structure are considered, the defects of low-temperature storage stability and the like can be overcome, and the low-temperature storage stability is relatively good; a liquid crystal display device comprising the liquid crystal composition has a relatively high response speed, a relatively large contrast ratio and a relatively wide temperature application range; the liquid crystal display panel is applied to a high-contrast fast-response NFFS liquid crystal display mode. # imgabs0 #

The invention discloses a liquid crystal composition with low viscosity, wide working temperature and low threshold voltage and application thereof. The liquid crystal composition comprises one or more compounds as shown in a structural general formula I and one or more compounds as shown in a structural general formula II. The liquid crystal composition disclosed by the invention not only can obtain relatively large dielectric tuning rate, relatively low dielectric loss, extremely low rotary viscosity and relatively low threshold voltage under high frequency, but also has the excellent characteristics of relatively wide nematic phase working temperature range, relatively large low-frequency dielectric constant and the like. # imgabs0 #

The application provides a negative liquid crystal composition and application thereof, and belongs to the technical field of liquid crystal materials. The negative liquid crystal composition comprises at least one compound represented by a general formula I, at least one compound represented by a general formula II, at least one compound represented by a general formula III, at least one compound represented by a general formula IV and at least one compound represented by a general formula V. The negative liquid crystal composition provided by the application has low rotational viscosity, large elastic constant, small optical dispersion, good low-temperature mutual solubility, relatively high transmittance and fast response speed, can be used for fast response liquid crystal display of various display modes, improves the transmittance and contrast ratio, and is especially suitable for IPS and FFS mode liquid crystal displays.

The invention provides a liquid crystal composition and application thereof, and belongs to the technical field of liquid crystal materials. The liquid crystal composition comprises at least one compound represented by a general formula I, at least one compound represented by a general formula II, at least one compound represented by a general formula III, at least one compound represented by a general formula IV and at least one compound represented by a general formula V. The liquid crystal composition provided by the invention has the advantages of low rotary viscosity, large elastic constant, small optical dispersion, good low-temperature intersolubility, relatively high transmittance and high response speed, can be used for fast-response liquid crystal display of multiple display modes, improves the transmittance and contrast ratio, and is especially suitable for IPS and FFS mode liquid crystal displays.

A liquid crystal composition includes at least one biphenyl or terphenyl compound and at least one compound represented by formula II. The liquid crystal composition has a relatively large absolute value of dielectric anisotropy, a relatively large K value, a relatively long low-temperature storage time period, a relatively low polymer layer surface roughness, a relatively small pre-tilt angle, a relatively fast speed for forming pre-tilt angle, a relatively low polymer residue, a relatively high VHR and a relatively good pre-tilt angle stability, while maintaining appropriate clearing points, optical anisotropy and rotational viscosity. A liquid crystal display device containing the liquid crystal composition has a relatively wide temperature usage range, relatively good contrast, and relatively good low-temperature mutual solubility. In addition, the production process of PSA-type liquid crystal displays is improved, and at the same time, the problems of “image sticking”, uneven display and “broken bright spots”.