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 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.

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 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 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 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.