102results about How to "High dielectric anisotropy" patented technology

A blue phase liquid crystal composition and a LC display using the composition. The liquid crystal composition includes a first class including a highly polar compound and a second class including a highly conjugated liquid crystal compound. The blue phase liquid crystal display device includes first and second substrates each with polarizer on the exterior surface and the blue phase liquid crystal composition sandwiched therebetween with and patterned electrodes on one of the substrates or both substrates. The patterned electrodes can be T-shaped, chevron or v-shaped, thin comb like shape and can also be flat or trapezoidal. The device outputs different light transmissions from the electrically controllable induced birefringence of the blue phase LC material for a low driving voltage, high transmittance blue phase liquid crystal display device.

The invention relates to a liquid crystal compound and its preparation method and use. The liquid crystal compound has a structure shown in the formula (I). Through specific combination of two end groups of the compound shown in the formula (I), the compound has the characteristics of low viscosity and high dielectric anisotropy so that the liquid crystal composition containing the compound solves the problem that the existing TFT-LCD has a response rate not fast enough, voltage not low enough and a charge conservation rate not high enough.

The present invention relates to the field of liquid crystal materials, and specifically discloses a liquid crystal composition containing a 1,3-dioxane compound and application of the same in a liquid crystal display device. The liquid crystal composition of the invention comprises the following components in parts by weight: 1-24 parts of one or more compounds selected from compounds represented by the formula (I), 1-80 parts of one or more compounds selected from compounds represented by the formula (II), 1-35 parts of one or more compounds selected from compounds represented by the formula (III), and 0-40 parts of one or more compounds selected from compounds represented by the formula (IV). An optical birefringence delta n of the liquid crystal composition is between 0.08 to 0.15, and has a moderate refraction range. The liquid crystal composition provided by the invention not only has characteristics like a broader nematic temperature range, a high resistivity, a high charge holding rate, and a low viscosity, but also has a faster response speed and good cryogenic storage stability. When the liquid crystal composition is applied to a liquid crystal display, particularly a display of the TFT-LCD mode, the display effect of the liquid crystal display can be improved significantly.

The invention provides a liquid crystal composition with high transmittance. The liquid crystal composition contains at least one or more of compounds represented by general formula I shown in the description and at least one of compounds represented by formula II shown in the description. The liquid crystal composition has the characteristics of low viscosity, high resistivity, good low temperature intersolubility, fast response speed and excellent transmittance, and can be used in fast response liquid crystal display with multiple display modes. FFS and IPS are most mainstream display modes at present, but the problem of low transmittance of the FFS and the IPS is a key problem to be solved. A result of experiments shows that the liquid crystal composition with large dielectric strength has high transmittance, so the brightness is improved without increasing the electric energy consumption. The liquid crystal composition provided by the invention has large dielectric strength, and effectively improves the transmittance of liquid crystal displays, and especially the displays in the FFS and IPS display modes.

The invention relates to a liquid crystal composition, a liquid crystal display element comprising the liquid crystal composition and a liquid crystal display, and belongs to the field of liquid crystal displaying, wherein the liquid crystal composition comprises one or more compounds represented by formula i, one or more compounds shown in formula II, one or more compounds represented by formulaIII, and one or more compounds represented by formula IV; the liquid crystal composition has low rotational viscosity, good photoelectric performance, high dielectric anisotropy and high response speed.

The invention relates to a liquid-crystal microwave modulation device and a modulation method thereof. The device comprises n liquid crystal boxes of the same structure and n paths of driving voltage signal sources A, n ranges from 2 to 10, each liquid crystal box structurally comprises a first glass substrate, a first ITO electrode, a first orientation layer, a liquid crystal layer, a second orientation layer, a second ITO electrode and a second glass substrate from top to bottom successively, the liquid crystal layer is provided with spherical resin separators, the n liquid crystal boxes of the same structure are stacked from top to bottom successively, the n paths of driving voltage signal sources A form n waveform signal generators independent from one another, and each waveform signal generator is connected with one liquid crystal box correspondingly. According to the invention, the liquid crystal dielectric constant of each layer in the microwave spreading direction can be changed according to multipath driving voltage signals set by users, and interference and diffraction results of emission microwaves can be adjusted.

The present invention discloses liquid crystal medium based on a mixture of polar compounds, the use thereof for electro-optical purposes, and displays containing the medium, wherein the liquid crystal medium comprises two or three compounds in formula I from 14 to 20, selectively compound in formula II from 0 to 5, one or two compounds in formula III from 15 to 19, two compounds in formula IV from 20 to 23, selectively one compound in formula V from 0 to 7, one or two compounds in formula VI from 11 to 18, one compound in formula VII from 5 to 7, selectively one compound in formula VIII from 0 to 5and two or three compounds in formula IX from 15 to 20.

The invention provides a liquid crystal compound containing a dibenzofuran ring. The liquid crystal compound has a structure as shown in the formula I in the description. The liquid crystal compound containing the dibenzofuran ring has larger dielectric anisotropy, lower rotational viscosity and higher clearing point, and the intersolubility among monomers is good, thereby being favorable for preparing a composition. A liquid crystal composition containing the liquid crystal compound has greater dielectric anisotropy, can more effectively reduce the driving voltage of a device, simultaneouslyhas lower rotational viscosity and shorter response time, has good chemical stability and thermal stability, has good application in a display device, and especially has good application in a displaydevice in a TFT mode.

The invention discloses a double-frequency liquid crystal material having low critical frequency. The double-frequency liquid crystal material comprises 20.0-25.0% of an ingredient A, 20.0-25.0% of an ingredient B, 17.5-22.5% of an ingredient C, 7.5-12.5% of an ingredient D, 7.5-12.5% of an ingredient E, 5.0-10.0% of an ingredient F and 5.0-10.0% of an ingredient G, and the above material are melt and mixed. The ingredient A comprises a series of derivatives having cyclohexylfluorodiphenylacetylene skeleton structures, the ingredient B comprises a series of derivatives having fluorodiphenylacetylene skeleton structures, the ingredient C comprises a series of derivatives having cyclohexylbenzene ring skeleton structures, the ingredient D comprises a series of derivatives having diphenylacetylene skeleton structures, the ingredient E comprises a series of derivatives having three-ring monoester lateral fluoro-group-containing cyano-terminated skeleton structures, and the ingredient F comprises a series of derivatives having three-ring diester lateral dicyano-containing skeleton structures. The double-frequency liquid crystal material has low critical frequency, wide liquid crystalline phase temperature and low viscosity and can be used for preparation of a double-frequency driven liquid crystal device having low work voltage and fast response rate.

The invention relates to the technical field of liquid crystal displaying, in particular to an easy thermal erasing type liquid crystal membrane writing board and a preparation method. The easy thermal erasing type liquid crystal membrane writing board comprises a PET transparent thin membrane with the single side coated with ITO, a liquid crystal thin membrane and a PET non-transparent black thinmembrane with the single side coated with ITO from top to bottom; the sides of conducting layers of the PET transparent thin membrane with the single side coated with the ITO and the PET non-transparent black thin membrane with the single side coated with the ITO are coated with insulating layers. Words written on the easy thermal erasing type liquid crystal membrane writing board can be completely removed under the lower voltage condition; the easy thermal erasing type liquid crystal membrane writing board can be packaged in rolling, and conveniently transported; the erasing and writing temperatures are low, the words can be reserved clearly at 0-4 DEG C, and the words written on the liquid crystal membrane writing board can be completely erased at the temperature between 45-60 DEG C.

The invention relates to the field of liquid crystal display, in particular to a liquid crystal medium and application thereof. The liquid crystal medium comprises at least one compound represented bya general formula I and at least one compound represented by a general formula II, wherein the compound represented by the general formula I is a tricyclic compound containing a 2,3-difluorobenzene structure which has higher negative dielectric anisotropy and a high bright spot; the compound represented by the general formula II is a dicyclic compound containing a 2,3-difluorobenzene structure which is a negative dielectric anisotropic liquid crystal compound which adopts a fluoroethoxy structure at the tail end, thereby greatly improving the dielectric anisotropy of the liquid crystal compound. The liquid crystal medium provided by the invention has low rotating viscosity, high low-temperature mutual solubility and fast response time, is suitable for VA type liquid crystal display devices such as VA/MVA/PVA/PSVA as well as IPS and FFS mode liquid crystal display devices, and is very useful for improving the response time of liquid crystal display. The general formula I and the general formula II are shown in the description.

The invention discloses a liquid crystal compound containing fluoropyrimidine and application thereof. The compound has the following structure, wherein R is C1-C8 alkyl or alkenyl, or fluorine-containing C1-C8 alkyl or alkenyl; X is a hydrogen group or a fluorine group; Z is one of the C1-C8 alkyl, the fluorine group, difluoromethyl, trifluoromethyl, trifluoromethoxy, difluoromethoxy or pentafluoroethyl. The compound has higher optical refractive index anisotropy (delta n), lower threshold voltage, wide liquid crystal phase temperature range, good optical, thermal, electric and chemical stabilities, and good compatibility with other compounds, can be used for improving the characteristics of a liquid crystal mixture, can be widely applied to mixed liquid crystal materials of TN, HTN, STN and TFT, and can be further applied to liquid crystal displays.

The invention discloses a high-clearing-point and high-refractive-index anisotropic negative liquid crystal composition which includes one or more of compounds represented as the general formula I, one or more of compounds represented as the general formula II, one or more of compounds represented as the general formula III, one or more of compounds represented as the general formula IV and/or one or more of compounds represented as the general formula V. The liquid crystal composition is high in response speed, low in rotation viscosity, high in clearing point, high in optical-anisotropy and high in dielectric-anisotropy. A liquid crystal display device employing the liquid crystal composition is quick in response, is high in clearing point and is low in driving voltage, can achieve balance of all performances and is suitable for liquid crystal displayer in the modes of VA, IPS or ECB. In addition, the polymerization wave band of a liquid crystal medium containing the liquid crystal composition can be closed to a large wave band, so that the liquid crystal medium can be used for producing the display device with a long UV wavelength, thereby reducing or avoiding harmful and damaging effect due to a short UV light component. The liquid crystal composition can be widely used in liquid crystal displayers in the modes of PSA, PSVA or PNLC.

The invention relates to a liquid crystal composition, in particular to a liquid crystal composition of a polarity compound based on positive dielectric anisotropy. The liquid crystal composition comprises one or multiple of polarity compounds shown in a formula I, one or multiple of polarity compounds shown in a formula II, one or multiple of compounds shown in a formula III, and one or multipleof compounds shown in a formula IV, wherein the structures of the formula I, the formula II, the formula III and the formula IV are shown in the attached figures. The liquid crystal composition has the beneficial effects that the penetration rate is improved, and the obvious function on improving contrast ratio is realized; the liquid crystal composition is especially suitable for liquid crystal display elements and liquid crystal display devices of active matrixes IPS-TFT and FFS-TFT with low box thickness, high display quality image. (The formulas are shown in the description.).

The invention discloses a liquid crystal composition with negative dielectric anisotropy, which is good in low temperature stability and high in response speed. The liquid crystal composition contains: one or more compounds as shown in general formula I-1 and/or I-2, which account for 20-65% of the total weight of a negative liquid crystal composition; one or more compounds as shown in a general formula II, which account for 8-25% of the total weight of the negative liquid crystal composition; one or more compounds as shown in general formula III, which account for 6-25% of the total weight ofthe negative liquid crystal composition; and one or more compounds as shown in general formula IV, which account for 30-60% of the total weight of the negative liquid crystal composition. The invention also discloses a liquid crystal display device comprising the liquid crystal composition. The formulae are as shown in the specification.

The invention relates to a liquid crystal compound having the structure of formula I wherein R is selected from the group consisting of H and alkyl or alkoxy groups of 1 to 12 carbon atoms in which one or more H are unsubstituted or substituted with halogen; A₁ is selected from the group consisting of a single bond or a 1,4-phenylene group in which each H in the 1,4-phenylene group is independently substituted by one or more halogen atoms; L₁ and L₂ are each independently selected from H or halogen; Z₁ is a single bond or —(CH₂)₂—. The compound has advantages of low rotational viscosity, large dielectric anisotropy, good mutual solubility and stability, which can be added to LC composition to reduce the driving voltage of the display. Thus, the novel compound has prosperous applications in LCD industry.

The invention discloses a benzofuran liquid crystal compound having a difluoromethyl ether bridge, and a composition containing the compound. The structural formula of the benzofuran liquid crystal compound having the difluoromethyl ether bridge is represented by formula (1) shown in the description; and in the formula (1), R1 is a C1-9 linear alkyl group, a C1-9 alkenyl group or a C1-9 alkoxy group, ring A is a benzene ring or trans-cyclohexane, a hydrogen atom on the benzene ring can be substituted with one or more fluorine atoms, n is 0 or 1, and each of X1 to X5 is a hydrogen atom or a fluorine atom. The liquid crystal compound has the characteristics of large dielectric anisotropy and high birefringence, and is suitable for TFT liquid crystal display, especially IPS, FFS, TN and VA display modes.

The invention relates to a negative dielectric anisotropic liquid crystal composition and a liquid crystal display device. The negative dielectric anisotropic liquid crystal composition comprises at least one compound as shown in a formula I and at least one polymerizable compound as shown in a formula II, and the polymerizable compound as shown in the formula II and a specific compound as shown in the formula I are combined for use, so that the PSVA liquid crystal composition is particularly suitable for display or TV application.

The present invention discloses a liquid crystal composition, which comprises one or a plurality of compounds represented by a formula I, and one or a plurality of compounds represented by a formula II, and further at least contains a compound represented by a formula II-A contained in the formula II, wherein each substituent is defined in the specification. According to the present invention, thecomposition has characteristics of low viscosity gamma1, high dielectric anisotropy [delta]epsilon and high optical anisotropy [delta]n, and can achieve the fast response of liquid crystal display.