31results about How to "The absolute value of dielectric anisotropy is large" patented technology

The invention discloses a liquid crystal composition with negative dielectric anisotropy. The liquid crystal composition with negative dielectric anisotropy is characterized by comprising the following ingredients in percentage by weight: 10%-70% of a first-component liquid crystal compound shown in the structural formula (I), 15%-60% of a second-component liquid crystal compound shown in the structural formula (II), 2%-45% of a third-component liquid crystal compound shown in the structural formula (III), and 2%-30% of a fourth-component liquid crystal compound shown in the structural formula (IV). The liquid crystal composition with negative dielectric anisotropy has the characteristics of being proper in negative dielectric anisotropy, wide in nematic phase range, low in rotary viscosity and short in response time, and is applicable to liquid crystal displays driven by active matrix thin-film transistors with VA (Vertical Alignment), IPS (In-Plane-Switching) and FFS (Fringe Field Switching) modes.

The invention provides a polyvinylidene floride derivative with a general formula (1) taken as a liquid crystal medium component, and a preparation method and application thereof. The derivative is a negative liquid crystal compound and has big dielectric anisotropic absolute value, proper optical anisotropy, high clearing point and wider nematic phase temperature range; and a display applying the derivative has quicker response speed and wider working range and can keep good display in various environments. The invention also provides one or more liquid crystal composition(s) including the derivative and a liquid crystal element including the liquid crystal composition (s).

The invention relates to liquid crystal composition with negative dielectric anisotropy. The liquid crystal composition comprises liquid crystal compounds shown in formulas I, II, III, IV, V and VI. The liquid crystal composition has very large dielectric anisotropy absolute value, higher clearing point, better high-temperature stability and low-temperature intersolubility, higher anti-UV capability, lower viscosity, short response time and high VHR (voltage holding ratio) and resistivity. The liquid crystal composition can be applied to display modes such as VA (vertical alignment), MVA (multidomain vertical alignment), PVA (patterned vertical alignment), FFS (fringe-field switching), PSVA ((polymer sustained vertically alignment), IPS (in-plane switching), TFT (thin film transistor) andthe like.

The invention relates to a low-refractive-index low-threshold negative dielectric anisotropy liquid crystal composition. The liquid crystal composition comprises the following components in percentageby weight: one or more liquid crystal compounds as shown in a general formula I and accounting for 1-90% of the total mass of the liquid crystal composition; one or more compounds represented by a general formula II and accounting for 1-60% of the total mass of the liquid crystal composition; one or more liquid crystal compounds represented by a general formula III and accounting for 1-60% of thetotal mass of the liquid crystal composition; one or more liquid crystal compounds represented by a general formula IV and accounting for 1-40% of the total mass of the liquid crystal composition, wherein the structures of the general formula I, the general formula II, the general formula III and the general formula IV are shown in the specification. The liquid crystal composition has the advantages of great dielectric anisotropy absolute value, high clearing point, low refractive index, excellent stability, UV resistance and pollution resistance. The liquid crystal composition can be widelyapplied to black-white and TFT-VA mode liquid crystal display elements.

The invention discloses a liquid crystal compound containing a tetrafluoro-dihydrophenanthrene structure and application of the liquid crystal compound. The liquid crystal compound has the advantagesof negative dielectric anisotropy, moderate refractive index, higher clearing point, lower viscosity and higher low-temperature intersolubility. The liquid crystal composition also contains liquid crystal compounds shown as general formulas II, III, IV and V, which have the characteristics of larger dielectric anisotropy absolute value, poor clearing point, higher stability and low-temperature intersolubility, higher UV resistance, lower viscosity, short response time and high VHR and resistivity; and the liquid crystal compound can be applied to display modes such as VA, MVA, PVA, FFS, PSVA,IPS and TFT.

The invention provides liquid crystal composition. The liquid crystal composition contains at least one compound in general formula I shown in the description, at least one compound in general formulaII-1 shown in the description and/or II-2 shown in the description and at least one compound in general formula III shown in the description. The liquid crystal composition has higher clearing point,lower viscosity, appropriately high dielectric anisotropy absolute value, appropriately high optical anisotropy, wide nematic phase temperature range and good low-temperature stability. The inventionfurther provides a liquid crystal display device containing the liquid crystal composition.

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 has good optical anisotropy, a high clearing point, a large dielectric anisotropy absolute value and a small quiescent current (initial, UV and water boiling) under the condition of maintaining appropriate low-temperature storage time, so that a liquid crystal display device containing the liquid crystal composition has good dielectric anisotropy and good dielectric anisotropy under the condition of appropriate low-temperature resistance. The liquid crystal composition is wide in usable temperature range, small in threshold voltage, good in contrast ratio and high in reliability.

The invention provides a liquid crystal composition and a liquid crystal display device containing the liquid crystal composition. The liquid crystal composition comprises at least one compound as shown in a general formula I, at least one compound as shown in a general formula II and at least one compound as shown in a general formula III. Compared with the prior art, the liquid crystal composition disclosed by the invention has a relatively low low-temperature storage phase change point, a relatively high clearing point, relatively large optical anisotropy, a relatively large dielectric anisotropy absolute value and relatively low rotary viscosity; and the liquid crystal display device comprising the liquid crystal composition has a wide use temperature range, a high contrast ratio, a low threshold voltage and a fast response speed.

The invention provides a liquid crystal compound shown in a general formula I, a liquid crystal composition containing the liquid crystal compound and a liquid crystal display device containing the liquid crystal composition. Compared with the prior art, the liquid crystal compound shown in the general formula I provided by the invention has a relatively large clearing point, relatively large optical anisotropy and a relatively large dielectric anisotropy absolute value under the condition of maintaining proper rotary viscosity, the liquid crystal composition containing the liquid crystal compound has a large clearing point, large optical anisotropy, a large dielectric anisotropy absolute value, a large elastic constant and a small ratio of the rotary viscosity to the spreadwise elastic constant under the condition that proper low-temperature storage stability and proper rotary viscosity are maintained, and the liquid crystal display device containing the liquid crystal composition has a wide nematic phase temperature range, a good contrast ratio, a low threshold voltage and short response time.

The invention provides a liquid crystal composition. The composition comprises at least three kinds of compounds with general formula I. The liquid crystal composition comprises lower viscosity, properly high dielectric anisotropy absolute value, higher optical anisotropy and good low temperature intersolubility. The invention also provides an application of the liquid crystal composition to liquid crystal displays, and the display has the advantages of fast response, wide temperature width, and the like.

The invention discloses a liquid crystal composition with positive dielectric anisotropy. The liquid crystal composition comprises at least one compound shown as a general formula I. The invention also provides a liquid crystal display device containing the liquid crystal composition. The liquid crystal composition provided by the invention also has a relatively large dielectric anisotropy absolute value, relatively low viscosity, a relatively large Kave value, relatively good low-temperature stability and relatively high transmittance on the premise of maintaining a proper high clearing point and proper large optical anisotropy; therefore, the liquid crystal display device containing the liquid crystal composition is low in threshold voltage, high in response speed, high in contrast ratio and wide in working temperature range. The liquid crystal composition provided by the invention can enable a liquid crystal display device containing the liquid crystal composition to obtain a good display effect.