31results about How to "High pretilt" patented technology

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 embodiment of the invention provides a liquid crystal display panel and a liquid crystal display device. The liquid crystal display panel comprises an array substrate which comprises a display area and a non-display area; a color film substrate, a common electrode being arranged on the color film substrate, and the common electrode being opposite to the display area and the non-display area; aliquid crystal molecular layer, arranged between the array substrate and the color film substrate; and a voltage alignment circuit, electrically connected with the display area and the non-display area respectively, and used for applying alignment voltage to the display area and the non-display area, so that an alignment electric field between the non-display area and the common electrode is stronger than that between the display area and the common electrode. According to the liquid crystal display panel and the liquid crystal display device, a large alignment electric field is provided in the non-display area, so that the pretilt angle of liquid crystal molecules in the non-display area is large, liquid crystal in the display area can be pushed to rapidly topple over in the display process, and then the response speed is increased.

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 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 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 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.

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 present invention relates to a method for producing an alignment film for liquid crystals, a method for producing a liquid crystal element, an apparatus for producing an alignment film for liquid crystals, and a liquid crystal element. An object of the present invention is to provide a new technology capable of setting the pretilt angle of liquid crystal molecules within a wide range. The present invention relates to a method for manufacturing an alignment film for liquid crystals. The method is used to manufacture an alignment film for liquid crystals on a substrate. Release the first material liquid in a state where a potential difference is relatively provided, so that the first material liquid forms a mist and spreads on the substrate; (b) a second step of relatively providing a potential between the second material liquid and the above-mentioned substrate In the poor state, the second material liquid is released, so that the second material liquid forms a mist and spreads on the substrate; and (c) a third step, solidifies the first material liquid and the second material liquid spread on the substrate.

The invention discloses a preparation method of a colorless and transparent polyimide liquid crystal alignment film. At room temperature, the dianhydride monomer 6FDA and the diamine monomer TFMB are reacted in DMAC to prepare a polyamic acid solution, and then the polyamic acid The amic acid solution is evenly coated on the glass substrate, and after prebaking and thermal imidization treatment, the liquid crystal cell is filled with E7 nematic liquid crystal, and the pretilt angle can reach 6.9° measured by the crystal rotation method. The polyimide liquid crystal alignment film has obvious advantages over ordinary aromatic polyimide alignment films. It is a colorless and transparent film, and the alignment film can obtain a high pretilt angle of 6.9°, which can well meet the needs of liquid crystal displays. Field The requirements for colorless and large pretilt angle of alignment film materials can be used as alignment film materials for super twisted nematic liquid crystal displays.

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 alignmentfilm 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-containingside chains in the polyimide, and the pre-tilt angle is 20-90 degrees.

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.

This invention provides alignment materials for liquid crystal display device of vertical alignment mode and methods for the preparation of the same, and more particularly, it provides diaminobenzene derivatives represented by the following formula 1:wherein n is an integer of 1 to 5 and R is an alkyl or alkoxy group of 3 to 5 carbon atoms, which align liquid crystal in uniform and vertical way, have not only excellent mechanical properties such as heat resistance and surface strength but also high pretilt angles of liquid crystal and in particular, can make response rate of liquid crystal fast, methods for the preparation of the same and liquid crystal alignment films using the same.

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.

The invention discloses a polyimide liquid crystal direct action membrane with a fluorine-contained surface, which is characterized in that the surface of the direct action membrane contains a structure of a carbon-fluorine covalent bond, the pretilt angle of which is 4-12.4 degrees or not more than 20 degrees. The invention also discloses a preparation method of the direct action membrane, whichcomprises the following steps: putting a side-chain type polyimide direct action membrane without fluorine structures in a nitrogen-filled vacuum reactor; and than charging mixed gas of fluorine gas and nitrogen in the vacuum reactor to conduct the fluoridation on the surface of the side-chain type polyimide direct action membrane. The polyimide liquid crystal direct action membrane with a fluorine-contained surface not only fills the gap and avoids the general problems of a polyimide liquid crystal direct action membrane with a fluorine-contained body, but also has low cost, wide range of the pretilt angle and wide application scope.