31results about How to "High pretilt" patented technology

The invention discloses a liquid crystal composite containing a difluorooxymethylene bridge polar monomer compound. The liquid crystal composite comprises the following components in percentage by weight: 1%-40% of compounds shown in a general formula I, 1%-40% of compounds shown in a general formula II, 5%-70% of compounds shown in a general formula III, 1%-60% of compounds shown in a general formula IV, 0%-20% of compounds shown in a general formula V and 0%-20% of compounds shown in a general formula VI. The liquid crystal composite disclosed by the invention has the characteristics of high response speed, low driving voltage and high resistivity and voltage conservation rate, has the capability of improving the viewing angle of a liquid crystal display by heightening the pretilt angle of a liquid crystal in a display and is suitable for a fast-responsive TFT-LCD (Thin Film Transistor Liquid Crystal Display).

A new method of obtaining high pretilt angles of predetermined values in a liquid crystal cell is disclosed. Appropriate amounts of compatible homogeneous and homeotropic alignment materials are mixed with special treatment methods to achieve the desired results.

The invention provides a light-sensitive monomer and a liquid crystal panel. In the light-sensitive monomer provided by the invention, fluorine atoms are used for replacing the hydrogen atoms of the hard core of the monomer, thus improving the electronegativity of the hard core, and then reducing a curing voltage during a curing process. Via the light-sensitive monomer provided by the invention, the curing voltage and curing time during the curing process for the liquid crystal panel are reduced, and the pre-tilt angles of liquid crystal molecules are increased so as to reduce the reaction time of a liquid crystal display, thus reducing the phenomena of ghost shadow and developing non-uniformity (MURA).

The invention discloses a preparation method of a polyimide liquid crystal alignment agent and a liquid crystal box thereof, which comprises the following steps: preparing soluble polyimide; adding a mixture of diamine and long-chain diamine into organic solvent in a nitrogen gas protective atmosphere, and then adding the prepared soluble polyimide; adding tetracarboxylic dianhydride multiple times, reacting at 20-40 DEG C for 3-5 hours, and then adding 20-30% of organic solvent, 10-40% of leveling agent and 0.1-1% of coupling agent, thus obtaining the polyimide liquid crystal alignment agent solution; and preparing the liquid crystal box from the alignment agent solution. According to the invention, the electric properties of a display device can be regulated by regulating the ratio of the soluble polyimide to polyamic acid; the long-chain diamine is used to provide a stable pretilt angle, so that the liquid crystal box disclosed by the invention has a high pretilt angle, a low residual direct current potential and a high voltage retention rate; and the reaction temperature of the synthesized alignment agent solution is biased towards room temperature or above, thus reducing the synthesis reaction time.

The invention relates to a silyl-containing polyimide liquid crystal alignment film with a large pre-tilt angle and a preparation method thereof. The silyl-containing polyimide liquid crystal alignment film is characterized by being prepared by the following steps and conditions: (1) adding 3-10 mol parts of silyl-containing diamine, 0-7 mol parts of organic diamine and 20-50 mol parts of an organic solvent to a reactor with a stirrer and a thermometer, adding 10 mol parts of tetracarboxylic dianhydride at 0-10 DEG C after dissolving the diamine under the protection of nitrogen, and reacting for 12-24h to obtain polyamic acid solution; (2) coating the polyamic acid solution on ITO glass, and curing at 180-250 DEG C for 1-3h to obtain the silyl-containing polyimide liquid crystal alignment film with the large pre-tilt angle. When the alignment film is used for preparing LCDs, the pre-tilt angle of liquid crystal molecules increases along with the increase in content of silyl-containing side chains in the polyimide, and the pre-tilt angle is 20-90 degrees.

Provided is a liquid crystal orientation treatment agent comprising the following specific polymer (A), specific polymer (B) and specific crosslinkable compound (C). Specific polymer (A) is at least one polymer selected from the group consisting of polyimide and polyimide precursors wherein a diamine compound having a side chain represented by formula [1] is used in a portion of the starting materials. Specific polymer (B) is at least one polymer selected from polyimide and polyimide precursors wherein a diamine compound having a side chain represented by formula [1] is used in a portion of the starting materials and the ratio of the diamine compound having a side chain represented by formula [1] in the total diamine component of the starting materials is smaller than the ratio of diamine compound having a side chain represented by formula [1] in the total diamine component of the starting materials of specific polymer (A). Specific crosslinkable compound (C) is a crosslinkable compound having two or more crosslinking groups selected from epoxy groups, and the like. (In formula [1], X1 is a single bond or a bonding group such as -O-, X2 is a single bond or -(CH2)b- (where b is an integer between 1 and 15), X3 is a single bond or a bonding group such as -O-, X4 is a divalent cyclic group selected from a benzene ring and the like, X5 is a divalent cyclic group selected from a benzene ring, and the like, n is an integer between 0 and 4, and X6 is a C1-18 alkyl group, and the like.)

The invention provides an orientated film material. The orientated film material comprises a film main body material and carborane cage-shaped modified organic compound nanoparticles mixed in the film main body material, wherein the film main body material is an acrylic resin or polyimide resin; a molecular formula of the carborane cage-shaped modified organic compound nanoparticles is C2B10H12RR', wherein R and R' are independently selected from one of -O-Si(CH2)m, -(CH2)n-CO- and C6H4-O- respectively, m is a natural number and n is a natural number. The invention further provides a preparation method of the oriented film material, an oriented film and a preparation method thereof. In the orientated film prepared by a copolymer prepared by utilizing the orientated film material, groups R and / or R' in the molecular structure of the carborane cage-shaped modified organic compound nanoparticles are combined on a molecular chain of the film main body material, so that the thermal performance, mechanical performance and anti-oxidant performance of the oriented film can be improved.

The invention belongs to the technical field of liquid crystal, and discloses a liquid crystal alignment agent, a liquid crystal alignment film comprising the same, and a liquid crystal display element. The liquid crystal alignment agent at least comprises one of polyamide acid solution and polyimide solution which are prepared by polyreaction of dianhydride compounds and diamine compounds in solvents; the diamine compounds at least include one of diamine compound group as shown as the formula I, wherein A1 is selected from one of oxygen atom, sulphur atom and NH group. The liquid crystal alignment film comprising the liquid crystal alignment agent can increase liquid crystal pretilt angle greatly, and has excellent liquid crystal alignment uniformity; the liquid crystal display element prepared from the liquid crystal alignment film has high contrast ratio and has the characteristic of quick fading of residual images caused by accumulation of direct-current charge.

Diamine compound containing specific triazine group, polyamic acid obtained by reacting the diamine compound and tetracarboxylic dianhydride, and liquid crystal alignment film obtained by coating and imidizing the polyamic acid. The liquid crystal alignment film has good heat-resistance, high transparency in visible light region and improved voltage holding ratio. Also, pretilt angle is easily controlled over broad range.

The invention provides a negative liquid crystal composition. The negative liquid crystal composition includes at least one compound shown as a formula I, at least one compound shown as a formula II, and at least one compound shown as a formula III. The negative liquid crystal composition has the advantages of appropriate optical anisotropy and dielectric anisotropy, fast response speed, good resistance to UV and high temperature reliability. The invention also provides a crystal main body composition containing the above liquid crystal composition and liquid crystal media of one or more polymerizable compounds or RM materials. At the same time, the invention also provides a liquid crystal display device comprising the liquid crystal composition or liquid crystal media.

The invention discloses a light control alignment polyimide liquid crystal alignment membrane as well as a preparation method and application thereof. The preparation method of the light control alignment polyimide liquid crystal alignment membrane comprises the following steps that a polyamide acid resin solution is prepared by using organic diamine containing heteroaromatic rings, aromatic diamine and aliphatic tetracid dianhydride as raw materials; an auxiliary agent is added into the polyamide acid resin solution to form a homogeneous phase solution; after the attenuation, polyimide liquidcrystal alignment liquid is obtained; the polyimide liquid crystal alignment liquid is applied on a base plate; through precuring treatment and curing treatment, a polyimide coating membrane is obtained; linear polarized ultraviolet light is used for irradiating the polyimide coating membrane; then, through an annealing treatment machine, the light control alignment polyimide liquid crystal alignment membrane is obtained. The light control alignment polyimide alignment membrane provided by the invention can be used for preparing TFT-LCD devices; the obtained TFT-LCD devices have the characteristics of low pretilt angle (0.2 degree or below), high VHR (greater than 95 percent), low RDC (smaller than 350 mV), liquid crystal box alignment uniformity and the like; the prepared IPS mode TFT-LCD displays can be widely applied to the fields of mobile electronics, monitors, televisions and the like.

The invention provides an alignment film material, which comprises a film body material and carborane cage modified organic compound nanoparticles mixed in the film body material, and the film body material is acrylic resin or polyimide Amine resin, the molecular formula of the carborane cage modified organic compound nanoparticles is C2B10H12RR', R and R' are independently selected from -O-Si(CH2)m, -(CH2)n-CO- and C6H4 One of ‑O‑, m is a natural number, n is a natural number. The invention also provides a preparation method of an alignment film material, an alignment film and a preparation method thereof. In the alignment film prepared by using the copolymer prepared from the alignment film material, the group R and / or R' in the molecular structure of the carborane cage modified organic compound nanoparticle is combined with the film host material On the molecular chain, the thermal properties, mechanical properties and oxidation resistance of the alignment film can be improved.

The invention provides a negative liquid crystal composition. The negative liquid crystal composition includes at least one compound shown as a formula I, at least one compound shown as a formula II, at least one compound shown as a formula III, and at least one compound shown as a formula IV. The negative liquid crystal composition has the advantages of appropriate optical anisotropy and dielectric anisotropy, fast response speed, good resistance to UV and high temperature reliability. The invention also provides a crystal main body composition containing the above liquid crystal composition and liquid crystal media of one or more polymerizable compounds or RM materials. At the same time, the invention also provides a liquid crystal display device comprising the liquid crystal composition or liquid crystal media.

Provided are a reflective liquid crystal display device and a liquid crystal display unit capable of eliminating or minimizing the occurrence of misalignment specific to a vertically aligned liquid crystal due to the structure of a pixel groove and achieving higher contrast and superior image quality. In a reflective pixel electrode (42), a peripheral portion is inclined, and the reflective pixel electrode has a trapezoidal shape so that the width of the reflective pixel electrode (42) increases from the top side to the bottom side. When a side surface of the reflective pixel electrode (42) is inclined so as to eliminate verticality in a cross section of the reflective pixel electrode (42), liquid crystal molecules aligned in a horizontal direction to an extreme in a pixel groove portion can be eliminated. Even if liquid crystal molecules are locally and slightly aligned in a horizontal direction, sufficient verticality can be maintained in the pixel groove portion by an interaction with vertically aligned liquid crystal molecules around the horizontally aligned liquid crystal molecules.

The invention relates to a diamine, the diamine is shown as the following formula (I), X and Y in the formula (I) are bivalent bond groups which are respectively selected from -O-, -(C=O)-O-, -O-(C=O)-,-(C=O)-NH- or -NH-(C=O)-, and the R is a group which is limited according to the instructions and the patent claims. The invention also provides polyamic acid and polyimide which are prepared by utilizing the diamine and are used as liquid crystal aligning agents.

The invention discloses a method for preparing a polyimide liquid crystal aligning agent. The method comprises the following steps: 1, dissolving specific diamine in an organic solvent in the presence of nitrogen at room temperature; 2, adding organic tetracid dianhydride, and stirring for a period of time 3, adding organic diamine, and stirring for a period of time; 4, diluting by an organic diluent; and 5, preparing the polyimide liquid crystal aligning agent.

The invention provides a liquid crystal aligning agent of a liquid crystal aligning film with a high pretilt angel, a good aligning uniformity and a good printing characteristic. A liquid crystal aligning agent comprises an unit including polyamide repeated units and a polymer of imidization repeated units described in the formula (I-2). The ratio of the polyamide repeated units is 60-90% and the imidization repeated units contain 5-100 mol% of specific repeated units such as formula (A), relative to the total quantity of the polyamide repeated units and the imidization repeated units.

The invention discloses a preparation method of a colorless transparent polyimide liquid crystal alignment film, which comprises the steps of reacting a dianhydride monomer 6FDA and a diamine monomerTFMB in DMAC at room temperature to prepare a polyamide acid solution, uniformly coating a glass substrate with the polyamide acid solution, and carrying out pre-drying and thermal imidization treatment to prepare a liquid crystal box filled with E7 nematic phase liquid crystal, wherein the pretilt angle measured by a crystal rotation method can reach 6.9 degrees. Compared with a common aromatic polyimide alignment film, the polyimide liquid crystal alignment film has obvious advantages, is a colorless and transparent film, can obtain a high pretilt angle of 6.9 degrees, and can well meet therequirements of the liquid crystal display field for the colorless and large pretilt angle of an alignment film material, and can be used as a super-twisted nematic liquid crystal display alignment film material.

Provided is a liquid crystal orientation treatment agent comprising the following specific polymer (A), specific polymer (B) and specific crosslinkable compound (C). Specific polymer (A) is at least one polymer selected from the group consisting of polyimide and polyimide precursors wherein a diamine compound having a side chain represented by formula [1] is used in a portion of the starting materials. Specific polymer (B) is at least one polymer selected from polyimide and polyimide precursors wherein a diamine compound having a side chain represented by formula [1] is used in a portion of the starting materials and the ratio of the diamine compound having a side chain represented by formula [1] in the total diamine component of the starting materials is smaller than the ratio of diamine compound having a side chain represented by formula [1] in the total diamine component of the starting materials of specific polymer (A). Specific crosslinkable compound (C) is a crosslinkable compound having two or more crosslinking groups selected from epoxy groups, and the like. (In formula [1], X1 is a single bond or a bonding group such as -O-, X2 is a single bond or -(CH2)b- (where b is an integer between 1 and 15), X3 is a single bond or a bonding group such as -O-, X4 is a divalent cyclic group selected from a benzene ring and the like, X5 is a divalent cyclic group selected from a benzene ring, and the like, n is an integer between 0 and 4, and X6 is a C1-18 alkyl group, and the like.)

Diamine compound containing specific triazine group, polyamic acid obtained by reacting the diamine compound and tetracarboxylic dianhydride, and liquid crystal alignment film obtained by coating and imidizing the polyamic acid. The liquid crystal alignment film has good heat-resistance, high transparency in visible light region and improved voltage holding ratio. Also, pretilt angle is easily controlled over broad range.

The invention provides a negative liquid crystal composition, which 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 has suitable optical anisotropy and dielectric anisotropy, faster response speed, better UV resistance performance and high temperature reliability. The present invention also provides a liquid crystal medium comprising the above liquid crystal composition as a liquid crystal host composition and one or more polymerizable compounds or RM materials. Meanwhile, the present invention also provides a liquid crystal display device comprising the liquid crystal composition or liquid crystal medium.

The invention relates to the field of liquid crystal materials, in particular to a diamine compound and a preparation method and application thereof. The structure of the diamine compound is shown asa formula I in the specification. When the diamine compound is prepared, a compound I-a raw material reacts with ammonia gas to obtain a compound I-b, and the compound I-b reacts with a fluorinating reagent to obtain a compound I. The invention further provides application of the diamine compound in the field of liquid crystal display. The provided diamine compound can improve the efficiency of aliquid crystal display element, and the prepared polyamide acid, polyimide and liquid crystal alignment agent all have good properties such as chemical stability and thermal stability, so that a formed liquid crystal alignment film has a higher pre-tilt angle; the prepared liquid crystal display element has fewer residual direct current charges, and thus the liquid crystal display element has higher efficiency. The preparation method is stable and efficient, raw materials are easy to obtain, the preparation process is simple, and popularization of the diamine compound is facilitated.

The invention discloses a liquid crystal composite containing a difluorooxymethylene bridge polar monomer compound. The liquid crystal composite comprises the following components in percentage by weight: 1%-40% of compounds shown in a general formula I, 1%-40% of compounds shown in a general formula II, 5%-70% of compounds shown in a general formula III, 1%-60% of compounds shown in a general formula IV, 0%-20% of compounds shown in a general formula V and 0%-20% of compounds shown in a general formula VI. The liquid crystal composite disclosed by the invention has the characteristics of high response speed, low driving voltage and high resistivity and voltage conservation rate, has the capability of improving the viewing angle of a liquid crystal display by heightening the pretilt angle of a liquid crystal in a display and is suitable for a fast-responsive TFT-LCD (Thin Film Transistor Liquid Crystal Display).

The invention discloses a light control alignment polyimide liquid crystal alignment membrane as well as a preparation method and application thereof. The preparation method of the light control alignment polyimide liquid crystal alignment membrane comprises the following steps that a polyamide acid resin solution is prepared by using organic diamine containing heteroaromatic rings, aromatic diamine and aliphatic tetracid dianhydride as raw materials; an auxiliary agent is added into the polyamide acid resin solution to form a homogeneous phase solution; after the attenuation, polyimide liquidcrystal alignment liquid is obtained; the polyimide liquid crystal alignment liquid is applied on a base plate; through precuring treatment and curing treatment, a polyimide coating membrane is obtained; linear polarized ultraviolet light is used for irradiating the polyimide coating membrane; then, through an annealing treatment machine, the light control alignment polyimide liquid crystal alignment membrane is obtained. The light control alignment polyimide alignment membrane provided by the invention can be used for preparing TFT-LCD devices; the obtained TFT-LCD devices have the characteristics of low pretilt angle (0.2 degree or below), high VHR (greater than 95 percent), low RDC (smaller than 350 mV), liquid crystal box alignment uniformity and the like; the prepared IPS mode TFT-LCD displays can be widely applied to the fields of mobile electronics, monitors, televisions and the like.