Polyimide Patents (Class 428/1.26)
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Patent number: 8057700Abstract: One embodiment of the present invention provides a liquid crystal photo-alignment agent that includes a polyamic acid copolymer including a repeating unit having the following Formula 1 and a repeating unit having the following Formula 2; a polyimide copolymer including a repeating unit having the following Formula 3 and a repeating unit having the following Formula 4; or a combination thereof: wherein the definition of R1 to R8 are the same as in the specification. The liquid crystal photo-alignment agent can have improved liquid crystal alignment properties, electrical characteristics such as voltage holding ratio, pretilt angle, residual DC, and the like, printability, cleaning stability, and spot stability, and is capable of unidirectionally aligning liquid crystals by ultraviolet (UV) exposure.Type: GrantFiled: December 5, 2008Date of Patent: November 15, 2011Assignee: Cheil Industries, Inc.Inventors: Jae-Min Oh, Dong-Seon Uh, Jae-Deuk Yang, Tae-Hyoung Kwak
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Patent number: 8057868Abstract: The present invention provides: a composition for forming a liquid crystal alignment film capable of forming a liquid crystal alignment film excellent in evenness; and a liquid crystal display device. The present invention provides a composition for forming a liquid crystal alignment film, wherein the composition comprises: a material for forming a liquid crystal alignment film; diethylene glycol diethyl ether; diisobutyl ketone; and at least one of ?-butyrolactone and N-methyl-2-pyrrolidone as solvents.Type: GrantFiled: January 7, 2009Date of Patent: November 15, 2011Assignee: Sharp Kabushiki KaishaInventors: Shinichi Terashita, Eiji Satoh, Iori Aoyama, Shouichi Nakata
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Patent number: 8057869Abstract: A plastic film comprising a multi-layer structure obtained by co-casting film formation or sequential-casting film formation of two or more layers of polyarylate having a glass transition temperature of 250° C. or higher and having a chemical structure represented by the following formula: wherein X represents a linking group having a naphthalene or biphenyl structure and A is represented by the following formula: wherein R1 and R2 represent an alkyl group or aryl group, j and k are an integer of from 0 to 4.Type: GrantFiled: March 22, 2006Date of Patent: November 15, 2011Assignee: Fujifilm CorporationInventors: Hirohisa Hokazono, Yasuo Mukunoki
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Patent number: 8053041Abstract: There has been a need for an overcoat film composition that functions as an overcoat film in terms of high transparency and flatness, and that also functions as an aligning film in terms of liquid crystal molecular alignment. There has also been a need to lower the cost of manufacturing a liquid crystal display element. There is provided an overcoat film composition comprising one or more compounds selected from the group of polyester-polyamic acids (A1) obtained using at least a polyhydric hydroxy compound (a1), a diamine (a2), and a compound having two or more acid anhydride groups (a3), and polyester-polyimides (A2) that are imidization products thereof, and a polyamic acid (B).Type: GrantFiled: June 28, 2007Date of Patent: November 8, 2011Assignee: JNC CorporationInventors: Hiroyuki Satou, Takahiro Mori
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Publication number: 20110234955Abstract: An alignment film (100) according to the present invention includes: a first alignment layer (102) containing a first polyimide (p1); and a second alignment layer (104) containing a polymerization product (po) resulting from polymerization of a polyfunctional monomer and a second polyimide (p2). The polyfunctional monomer is represented by general formula (1) P1-A1-(Z1-A2)n-P2 (in general formula (1), P1 and P2 each independently of the other are an acrylate, methacrylate, acrylamide, methacrylamide, vinyl, vinyloxy, or epoxy group; A1 and A2 each independently of the other represent a 1,4-phenylene, 1,4-cyclohexane, 2,5-thiophene, or naphthalene-2,6-diyl group; Z1 is a —COO— group, a —OCO— group, a —O— group, a —CONH— group or a single bond, where n is 0, 1, or 2).Type: ApplicationFiled: June 26, 2009Publication date: September 29, 2011Inventors: Masanobu Mizusaki, Ychei Nakanishi
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Patent number: 8025939Abstract: A liquid crystal display is provided which is capable of reducing the occurrence of defective display due to variations in the initial alignment direction of a liquid crystal alignment control film in a liquid crystal display of an IPS scheme, realizing the stable liquid crystal alignment, providing excellent mass productivity, and having high image quality with a higher contrast ratio. The liquid crystal display has a liquid crystal layer disposed between a pair of substrates, at least one of the substrates being transparent, and an alignment control film formed between the liquid crystal layer and the substrate. At least one of the alignment control films 109 comprises photoreactive polyimide and/or polyamic acid provided with an alignment control ability by irradiation of substantially linearly polarized light.Type: GrantFiled: May 18, 2010Date of Patent: September 27, 2011Assignee: Hitachi Displays, Ltd.Inventors: Yasushi Tomioka, Hidetoshi Abe, Katsumi Kondo
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Publication number: 20110164213Abstract: An alignment film (100) according to the present invention contains polyimide (102) and a polyvinyl compound (104), the polyvinyl compound (104) containing a polymerization product of a polyfunctional monomer having a plurality of vinyl groups. Preferably, each of the plurality of vinyl groups of the polyfunctional monomer is a part of a methacrylate group or an acrylate group. Preferably, the polyfunctional monomer has two or more directly-bonded ring structures or one or more condensed ring structures between the plurality of vinyl groups. Preferably, both of the polyimide (102) and the polyvinyl compound (104) are present on the surface and in the interior.Type: ApplicationFiled: August 28, 2009Publication date: July 7, 2011Inventors: Yohei Nakanishi, Masanobu Mizusaki
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Patent number: 7968670Abstract: Disclosed is a polyimide resin, which is colorless and transparent and has superior properties, including mechanical properties and heat stability, and thus is usable in various fields, including semiconductor insulating films, TFT-LCD insulating films, transparent electrode films, passivation films, liquid crystal alignment layers, optical communication materials, protective films for solar cells, and flexible display substrates. Also, a liquid crystal alignment layer and a polyimide film using the polyimide resin are provided.Type: GrantFiled: December 13, 2007Date of Patent: June 28, 2011Assignee: Kolon Industries, Inc.Inventors: Hak Gee Jung, Sang Wook Park, Hyo Jun Park
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Publication number: 20110149220Abstract: An alignment layer according to an exemplary embodiment of the present invention includes a polyimide, wherein the polyimide is derived from a composition including a dianhydride-based compound, and a compound represented by a Chemical Formula 1: wherein, in the above Chemical Formula 1, X1 and X2 are independently F, Cl, or CN, and R1 is a substituted or non-substituted C1-C12 alkyl group, a substituted or non-substituted C1-C12 alkoxy group, a substituted or non-substituted C1-C12 halogen-containing alkyl group, a substituted or non-substituted C1-C12 halogen-containing alkoxy group, or a combination thereof.Type: ApplicationFiled: June 17, 2010Publication date: June 23, 2011Applicant: Samsung Electronics Co., Ltd.Inventors: Ho-Yun BYUN, Jeong-Uk Heo, Ji-Yoon Jung, Na-Young Shin
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Patent number: 7944532Abstract: A liquid crystal display device includes a pair of substrates, a liquid crystal between substrates and alignment layers disposed on the inner surface sides of the substrates. The alignment layer is made from a material including polyamic acid containing a diamine component and polyimide containing a diamine component different from the diamine component of the polyamic acid. The alignment layer is subjected to alignment treatment by irradiation of light. UV light can be irradiated in the oblique direction onto the alignment layer through a mask having openings. A reflecting plate can be arranged between a UV light source and the mask. Also, bank structures having a thickness from 0.1 to 0.15 ?m can be provided on the alignment layer of the TFT substrate.Type: GrantFiled: July 19, 2010Date of Patent: May 17, 2011Assignee: Sharp Kabushiki KaishaInventors: Hideo Chida, Hidefumi Yoshida, Yasutoshi Tasaka
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Patent number: 7914863Abstract: A liquid crystal alignment solution is provided. The liquid crystal alignment solution includes a first polyimide-polyamide acid and a second polyimide-polyamide acid. The first polyimide-polyamide acid is represented by formula (A), and the second polyimide-polyamide acid is represented by formula (B), in which T1, T2, T3 and T4 are each independently a tetravalent residue of a tetracarboxylic acid dianhydride; D1, D2, D3 and D4 are each independently a divalent residue of a diamine; and m, n, p and q are each independently an positive integer, wherein m/(m+n)?0.5 and p/(p+q)?0.5.Type: GrantFiled: January 21, 2009Date of Patent: March 29, 2011Assignee: Daxin Material CorporationInventors: Ming-Chih Lai, Wen-Chung Chu, Chin-Wen Chang, Min-Ruei Tsai
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Patent number: 7901745Abstract: 3,4-Dicarboxy-1,2,3,4-tetrahydro-6-t-butyl-1-naphthalene-succinic dianhydride is provided. The tetracarboxylic dianhydride is represented by Formula 1, which is described in the specification. Further provided is a liquid crystal aligning agent comprising a polyimide prepared using the tetracarboxylic dianhydride and a solvent. Further provided is a liquid crystal alignment layer formed using the liquid crystal aligning agent. The liquid crystal alignment layer exhibits excellent electro-optical properties and good processability in terms of printability.Type: GrantFiled: June 2, 2009Date of Patent: March 8, 2011Assignee: Cheil Industries Inc.Inventors: Jae Min Oh, Tae Hyoung Kwak, Ji Young Jeong
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Publication number: 20110051050Abstract: The present invention relates to a composition for liquid crystal alignment layer, a preparation method of liquid crystal alignment layer using the same, and an optical film comprising the liquid crystal alignment layer. More particularly, the composition for liquid crystal alignment layer according to the present invention includes crosslinkable functional monomers as well as a photoreactive polymer, thereby improving thermal stability and durability of the liquid crystal alignment layer that is prepared by using the composition for liquid crystal alignment layer. In addition, when the liquid crystal alignment layer is used to produce an optical film, adhesive strength between substrate and liquid crystal alignment layer and between liquid crystal alignment layer and liquid crystal film can be improved.Type: ApplicationFiled: January 19, 2009Publication date: March 3, 2011Applicant: LG CHEM, LTD.Inventors: Du-Hyun Shin, Hyuk Yoon, Moon-Soo Park, Je-Hyuk Yoo, Sung-Ho Chun, Heon Kim, Dai-Seung Choi, Dong-Woo Yoo
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Patent number: 7838092Abstract: A gas barrier film comprising a gas barrier laminate on a substrate film, in which the gas barrier laminate comprises at least one three-layer unit consisting of a silicon oxynitride layer, a silicon oxide layer, and a silicon oxynitride layer disposed in this order.Type: GrantFiled: July 11, 2006Date of Patent: November 23, 2010Assignee: Fujifilm CorporationInventors: Hiroshi Iwanaga, Seiya Sakurai
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Patent number: 7815982Abstract: A gas barrier film comprising a gas barrier laminate on a substrate film, in which the gas barrier laminate comprises at least one three-layer unit consisting of a silicon nitride layer, a silicon carbide compound layer, and a silicon nitride layer disposed in this order being adjacent with each other.Type: GrantFiled: April 11, 2006Date of Patent: October 19, 2010Assignee: Fujifilm CorporationInventor: Hiroshi Iwanaga
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Patent number: 7815983Abstract: A gas-barrier film comprising a gas-barrier laminate on a substrate film, wherein the gas-barrier laminate comprises at least one three-layer unit consisting of a silicon oxinitride layer, an organic interlayer and a silicon oxinitride layer disposed in this order being adjacent with each other. The film has excellent transparency, gas-barrier performance and bending resistance.Type: GrantFiled: March 26, 2007Date of Patent: October 19, 2010Assignee: Fujifilm CorporationInventor: Hiroshi Iwanaga
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Patent number: 7815981Abstract: A gas barrier film comprising a gas barrier laminate on a substrate film, wherein the gas barrier laminate comprises at least one three-layer unit consisting of a silicon nitride layer, a silicon oxynitride layer adjacent to the silicon nitride layer, and a silicon nitride layer adjacent to the silicon oxynitride layer. The gas barrier film has excellent transparency and gas barrier property.Type: GrantFiled: March 21, 2006Date of Patent: October 19, 2010Assignee: FUJIFILM CorporationInventors: Hiroshi Iwanaga, Seiya Sakurai
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Publication number: 20100255221Abstract: Disclosed is a polyimide film, which is colorless and transparent, with superior mechanical properties and high thermal stability.Type: ApplicationFiled: August 27, 2008Publication date: October 7, 2010Applicant: KOLON INDUSTRIES, INC.Inventors: Hak Gee Jung, Hyo Jun Park, Sang Min Song, Chung Seock Kang
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Publication number: 20100255222Abstract: A display element that includes substrates each having a thin film layer formed by applying a thin film layer composition thereon by an ink-jet method, in which, in the formation of the thin film layers, streaky display unevenness does not develop along a direction in which an ink-jet head discharges the composition having the shape of dots aligned on straight lines from the nozzles. In the liquid crystal display element 1 including an array substrate 5 including an alignment film 8, and a color filter substrate 3 including an alignment film 7, the substrates 5 and 3 being used in a pair, the dots on the alignment films 7 and 8 are aligned such that an interval between the straight lines on the alignment film 8 is displaced by half an interval from an interval between the straight lines on the alignment film 7.Type: ApplicationFiled: August 20, 2008Publication date: October 7, 2010Applicant: Sharp Kabushiki KaishaInventors: Shinichi Hirato, Iichiro Inoue, Ryoh Ueda, Hiroyuki Hakoi, Koichi Miyachi
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Patent number: 7790248Abstract: An active matrix type liquid crystal display apparatus has a pair of substrates, at least one of the substrates being transparent; a liquid crystal layer arranged between the pair of substrates; and electrode structure for generating an electric field having a dominant component parallel to a surface of the substrate and passing through the liquid crystal layer, the electrode structure being formed on one of the pair of substrates; a pair of alignment layers formed on respective surfaces in contact with the liquid crystal layer of the pair of substrates; and a pair of polarizing plates arranged so as to sandwich the pair of substrates, wherein the glass transition temperature Tg of a boundary surface between said liquid crystal layer and the alignment layer is higher than the nematic-isotropic phase transition temperature T(N?I) of a liquid crystal composite forming the liquid crystal layer.Type: GrantFiled: February 21, 2007Date of Patent: September 7, 2010Assignee: Hitachi, Ltd.Inventors: Yasushi Tomioka, Takao Miwa, Katsumi Kondo, Hisao Yokokura
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Publication number: 20100208183Abstract: A liquid crystal display device and a method for manufacturing the same are disclosed. In an embodiment of the present invention, a liquid crystal display device and a method of manufacturing the liquid crystal display device includes a first substrate that has a first electrode formed thereon, a second substrate that faces the first substrate, a liquid crystal layer that is formed between the first substrate and the second substrate, and a first alignment layer that is formed on the first substrate and is in contact with the liquid crystal layer. Here, the first alignment layer includes a first alignment base layer that is photoaligned, and a first alignment controlling layer that is extended from the inside of the first alignment base layer.Type: ApplicationFiled: September 15, 2009Publication date: August 19, 2010Inventor: Jae-Hoon Kim
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Publication number: 20100165284Abstract: The present invention provides a method of producing an optical laminate that can produce an optical laminate including an applied film containing a lyotropic liquid crystalline compound so that the thickness of the applied film will be approximately uniform. A method of producing an optical laminate having a base material and an applied film, comprising the step of applying a solution containing at least one kind of lyotropic liquid crystalline compound on the base material so as to form the applied film, wherein the concentration of the lyotropic liquid crystalline compound in the solution is lower than the isotropic phase-liquid crystal phase transition concentration. For example, the concentration of the lyotropic liquid crystalline compound in the solution is from (CIN?18)% by mass to (CIN?1)% by mass, where CIN represents the isotropic phase-liquid crystal phase transition concentration.Type: ApplicationFiled: February 4, 2008Publication date: July 1, 2010Applicant: NITTO DENKO CORPORATIONInventors: Yasuko Iwakawa, Shusaku Nakano, Shoichi Matsuda
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Patent number: 7742138Abstract: It is an object to provide a liquid crystal display which reduces unsatisfactory display caused by distorted initial alignment direction in a liquid crystal alignment layer for IPS type displays, realizes stable liquid crystal alignment, is high in mass-productivity, and produces high-quality images of increased contrast ratio. The liquid crystal display contains alignment layers 109 placed between a pair of substrates 101 and 102, at least one of which is transparent, liquid crystal layer 110? sealed between the alignment layers, common electrode 103 and source electrode 105 for applying an electrical field to the liquid crystal layer, thin-film transistors connected to each of these electrodes, polarizer plate 114 provided on at least one of the substrates, wherein at least one of the alignment layers 109 is composed of a photo-reactive polyimide and/or polyamic acid which can be provided with a liquid crystal alignment capacity by being irradiated with essentially linearly polarized light.Type: GrantFiled: June 7, 2005Date of Patent: June 22, 2010Assignee: Hitachi Displays, Ltd.Inventors: Masaki Matsumori, Yasushi Tomioka, Shigeru Matsuyama
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Publication number: 20100151155Abstract: The liquid crystal alignment agent according to one embodiment of the present invention includes a soluble polyimide polymer of Formula 1 and a solvent. The soluble polyimide polymer has a number average molecular weight of about 10,000 to 500,000 g/mol, and a polydispersity of about 1.2 to about 1.75. The liquid crystal alignment agent can have good printability on a substrate, and thereby can provide a liquid crystal alignment film that can have excellent film uniformity, even though its predrying temperature is varied.Type: ApplicationFiled: February 25, 2010Publication date: June 17, 2010Applicant: CHEIL INDUSTRIES INC.Inventors: Tae-Hyoung KWAK, Jae-Min OH, Won-Seok DONG, Sun-Nyo YU
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Publication number: 20100143612Abstract: A polymerizable liquid crystal composition is provided that can exhibit a uniform homogeneous alignment by coating the composition on a supporting substrate having been subjected to an alignment treatment. The polymerizable liquid crystal composition contains a mixture of polymerizable compounds containing a compound selected from a group of compounds represented by the formula (1-1) as a component A and a compound selected from a group of compounds represented by the formula (2-1) as a component B as essential components, and optionally containing a compound selected from a group of compounds represented by the formulae (3-1) to (3-3) as a component C and/or a compound selected from a group of compounds represented by the formula (4-1) as a component D, and contains at least one nonionic surfactant as a component E. Examples of each of the components are shown below, in which T represents triptycen-1,4-diyl.Type: ApplicationFiled: December 10, 2009Publication date: June 10, 2010Inventor: Yoshiharu Hirai
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Publication number: 20100136264Abstract: Disclosed are a liquid crystal alignment agent, and a liquid crystal alignment film and a liquid crystal display (LCD) including the same. The liquid crystal alignment agent includes a polymer of polyamic acid, a polyimide, or a combination thereof, and an epoxy compound represented by the following Chemical Formula 1. In the above Chemical Formula 1, each substituent is the same as defined in the specification.Type: ApplicationFiled: August 19, 2009Publication date: June 3, 2010Applicant: CHEIL INDUSTRIES INC.Inventors: Bum-Jin LEE, Won-Seok DONG, Mi-Ra IM, Dong-Seon UH
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Patent number: 7718234Abstract: A liquid crystal display is provided which is capable of reducing the occurrence of defective display due to variations in the initial alignment direction of a liquid crystal alignment control film in a liquid crystal display of an IPS scheme, realizing the stable liquid crystal alignment, providing excellent mass productivity, and having high image quality with a higher contrast ratio. The liquid crystal display has a liquid crystal layer disposed between a pair of substrates, at least one of the substrates being transparent, and an alignment control film formed between the liquid crystal layer and the substrate. At least one of the alignment control films comprises photoreactive polyimide and/or polyamic acid provided with an alignment control ability by irradiation of substantially linearly polarized light.Type: GrantFiled: December 8, 2003Date of Patent: May 18, 2010Assignee: Hitachi Displays, Ltd.Inventors: Yasushi Tomioka, Hidetoshi Abe, Katsumi Kondo
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Patent number: 7714096Abstract: It is provided for a resin composition including (A) at least one polyamic acid having the structure represented by the following formula (1): wherein R1 is independently an alkyl group having 1 to 3 carbon atoms or a cyano group; a is independently an integer of 0 to 4; R is a tetravalent organic group; n is an integer of 1 to 4; and m is an integer of 1 to 100,000, and (E) an organic solvent.Type: GrantFiled: March 28, 2008Date of Patent: May 11, 2010Assignees: Tokyo Institute of Technology, JSR CorporationInventors: Mitsuru Ueda, Shinji Ando, Jin-gang Liu, Yuzi Shibasaki, Yasuhiro Nakamura, Shuichi Sugawara, Miwa Ariyuki, Yuichi Eriyama, Keisuke Kuriyama, Hideaki Takase
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Publication number: 20100091229Abstract: Compositions, devices, and methods are provided for a switchable alignment layer coated on a substrate for a liquid crystal device comprising an attachment layer and an adjustable side-chain, where an electric field is capable of changing orientation of the adjustable side-chain between a first state and a second state.Type: ApplicationFiled: October 14, 2008Publication date: April 15, 2010Inventors: Qin Liu, Stephen C. Kitson, Jeffrey T. Mabeck, Charles G. Dupuy
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Patent number: 7691325Abstract: A method of manufacturing a vapor-sensing device, including placing an aqueous dispersion of colloidal spheres on a substrate, drying the aqueous dispersion of colloidal spheres to obtain a colloidal crystal, filling the voids among the colloidal crystal with a vapor-expandable matrix composition, curing the vapor-expandable matrix composition, and peeling away any excess vapor-expandable matrix material from the surface of the film, so that the colloidal crystal is exposed.Type: GrantFiled: October 19, 2006Date of Patent: April 6, 2010Assignee: Xerox CorporationInventors: Naveen Chopra, Peter M. Kazmaier
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Patent number: 7687118Abstract: A diamine compound is proposed as well as polymers, copolymers, polyamic acids, polyamic acid esters, or polyimides based on such compound. The compound is represented by one of the general formulae (Ia) and (Ib). It could be shown that such structures, in particular for a specific choice of the residue B, provide, if e.g. used as orientation layers, a photostable, vertically aligning material with an improved VHR.Type: GrantFiled: October 5, 2005Date of Patent: March 30, 2010Assignee: Rolic AGInventors: Zoubair Mohammed Cherkaoui, Thomas Bachels, Guy Marck, Olivier Müller, Andreas Schuster, Hubert Seiberle
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Publication number: 20100060834Abstract: The present invention relates to a novel polyimide copolymer, a method of preparing the polyimide copolymer, a liquid crystal aligning layer including the polyimide copolymer, a method of producing the liquid crystal aligning layer, and a liquid crystal display including the liquid crystal aligning layer. The liquid crystal aligning layer that includes the polyimide copolymer according to the present invention is advantageous in that when ultraviolet rays are radiated on movable chains of the polyamic acid copolymer to perform alignment before a polyimide copolymer is imidized and heat treatment is then performed to conduct imidization, thermal stability is excellent, residual images are not formed, and alignment of liquid crystals is excellent.Type: ApplicationFiled: January 7, 2008Publication date: March 11, 2010Inventors: Xing-Zhong Fang, Kyung-Jun Kim, Byung-Hyun Lee, Jung-Ho Jo, Dong-Hyun Oh, Wan-Hee Goh, Sang-Kook Kim, Hye-Ran Seong, Hye-Won Jeong, Yun-Jeong Lee
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Publication number: 20100034989Abstract: An alignment substrate includes a substrate and an alignment layer. The substrate includes a plurality of unit pixel areas. Each of the unit pixel areas includes a plurality of sub-pixel areas arranged in a matrix configuration. The alignment layer is on the substrate and has polymer chains protruding from a surface of the alignment layer. The alignment layer has a plurality of alignment vectors in which the polymer chains are pretilted according to the sub-pixel areas. The alignment vectors corresponding to adjacent sub-pixel areas point in different directions from each other.Type: ApplicationFiled: August 5, 2009Publication date: February 11, 2010Applicant: Samsung Electronics CO., LTD.Inventors: Nak-Cho CHOI, Hyun-Ku AHN, Bong-Sung SEO, Young-Gu KIM, Min-Sik JUNG, Tae-Sung JUNG, Byoung-Hun SUNG, Sung-Yi KIM
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Patent number: 7659360Abstract: A polyimide resin is produced by the reaction of a compound selected from 1,2,4,5-cyclohexanetetracarboxylic acid, dianhydride thereof and reactive derivatives thereof and a compound selected from diamines and diisocyanates each containing at least one phenylene group and at least one isopropylidene group. The polyimide resin is colorless and exhibits a high heat resistance, a high transparency and a low water absorption.Type: GrantFiled: December 19, 2005Date of Patent: February 9, 2010Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Takashi Makinoshima, Shuta Kihara
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Patent number: 7625611Abstract: The present invention to a composition for liquid crystal aligning comprising an oligoimide or oligoamic acid, which comprises a thermocurable or photocurable functional group on at least one end of the oligoimide or oligoamic acid backbone, a liquid crystal aligning layer prepared from the same, and a liquid crystal display comprising the same. The composition for liquid crystal aligning according to the present can minimize the generation of the decomposed by-products, which had been generated upon the use of polyimides, by using an oligoimide or oligoamic acid on at least one end of the backbone, instead of the conventional polyimides and has an excellent effect of improvement in alignment property, thermal stability, and image sticking.Type: GrantFiled: January 4, 2007Date of Patent: December 1, 2009Assignee: LG Chem. Ltd.Inventors: Kyung-Jun Kim, Yun-Jeong Lee, Sang-Kook Kim, Hye-Ran Seong, Dong-Hyun Oh, Jung-Ho Jo
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Patent number: 7615260Abstract: An active-matrix liquid crystal display device includes a pair of substrates, a liquid crystal layer disposed between the pair of substrates, a group of electrodes for applying to the liquid crystal layer an electric field substantially parallel to the substrate plane and a plural number of active elements being formed on one of the pair of substrates, and an alignment layer disposed between the liquid crystal layer and at least one of the pair of substrates. The alignment layer is made from polyamic acid obtained by reacting a diamine with an acid anhydride, and the acid anhydride is at least one member selected from the group consisting of 1,2,3,4-cyclopentanetetracarboxylic acid dianhydride, 1,2,3,4-butanetetracarboxylic acid dianhydride, and 1,2,3,4-cyclobutanetetracarboxylic acid dianhydride.Type: GrantFiled: June 24, 2004Date of Patent: November 10, 2009Assignee: Hitachi, Ltd.Inventors: Makoto Yoneya, Kishiro Iwasaki, Yasushi Tomioka, Hisao Yokokura, Katsumi Kondo, Yoshiharu Nagae
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Patent number: 7585551Abstract: The invention relates to a polyimide resin polymer which contains at least one repeating unit selected from those of formula (A-1) and formula (A-2) below as polymerization units, wherein P1, P2, Q1, and Q2 are as defined in the specification. The polymer of the invention can be used as an alignment material in liquid crystal displays.Type: GrantFiled: June 29, 2007Date of Patent: September 8, 2009Assignee: Daxin Materials CorporationInventors: Ming-Ruei Tsai, Wen-Chung C Chu, Chang Chia-Wen, Lai Ming-Chih
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Publication number: 20090220707Abstract: To provide a liquid crystal aligning agent useful to obtain a liquid crystal alignment film excellent in liquid crystal alignment properties, alignment controlling power and rubbing resistance, having high voltage retention characteristics and having reduced charge accumulation, and a liquid crystal display device which is less susceptible to display failure, to lowering of contrast or to image persistence. A liquid crystal aligning agent comprising a low resistance polyimide precursor having a volume resistivity of from 1×1010 to 1×1014 ?cm when formed into a film, and a high alignment polyimide precursor or polyimide having a specific structure, and a liquid crystal display device employing this liquid crystal aligning agent.Type: ApplicationFiled: July 15, 2008Publication date: September 3, 2009Applicant: Nissan Chemical Industries LimitedInventors: Kimiaki Tsutsui, Takahiro Sakai, Kohei Goto
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Patent number: 7537812Abstract: To provide a liquid crystal aligning agent which gives a coating film with good uniformity regardless of drying temperature after coating, and a liquid crystal alignment film having good coating film uniformity. A liquid crystal aligning agent comprising at least one polymer selected from a polyamic acid and a soluble polyimide, diethylene glycol diethyl ether, and dipropylene glycol monomethyl ether, and a liquid crystal alignment film obtained by printing this liquid crystal aligning agent by a flexographic printing method.Type: GrantFiled: February 10, 2004Date of Patent: May 26, 2009Assignee: Nissan Chemical Industries, Ltd.Inventors: Mariko Kurosaki, Go Ono, Kio Mizuno
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Publication number: 20090130343Abstract: An LCD device adapted to improve a residual image matter is disclosed. The LCD device includes an alignment layer aligning the liquid crystal. The alignment layer is formed of an optically aligned composition inclusive of an aromatic compound. Also, the alignment layer undergoes a crosslinking process. In accordance therewith, the thermalization of the alignment layer is improved. As a result, the residual image problem of the LCD device can be solved.Type: ApplicationFiled: October 16, 2008Publication date: May 21, 2009Applicant: LG Display Co., Ltd.Inventor: Shin Dong Cheon
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Patent number: 7524541Abstract: To provide a liquid crystal aligning agent useful to obtain a liquid crystal alignment film which exhibits a high voltage retention characteristic even under high temperature conditions and which has a low accumulation charge, and a liquid crystal display device which is less susceptible to lowering of contrast or to image persistence.Type: GrantFiled: August 28, 2003Date of Patent: April 28, 2009Assignee: Nissan Chemical Industries, Ltd.Inventors: Kimiaki Tsutsui, Takahiro Sakai, Kohei Goto
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Patent number: 7498068Abstract: A liquid crystal aligning agent capable of forming a liquid crystal alignment film having favorable electrical characteristics, and excellent in the storage stability and the productivity.Type: GrantFiled: April 27, 2005Date of Patent: March 3, 2009Assignee: Nissan Chemical Industries, Ltd.Inventors: Kimiaki Tsutsui, Kohei Goto, Hirobumi Shida, Masahide Ishizuya
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Patent number: 7491752Abstract: Photoreactive dendrimers comprising a core portion, branching units and terminal groups, wherein at least one terminal group and/or branching unit is a photoreactive group and wherein the photo reactive groups include preferably cinnamates, coumarins, benzylidenephthalimidines, benzylideneacetophenones, diphenylacetylenes stilbazoles, uracyl, quinolinone, maleinimides, or cinnamylidene acetic acid derivatives and are able to undergo photocyclization, in particular [2+2]-photocyclization.Type: GrantFiled: July 15, 2002Date of Patent: February 17, 2009Assignee: Rolic AGInventors: Guy Marck, Hubert Seiberle, Mohammed Ibn-Elhaj
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Publication number: 20090041955Abstract: 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.Type: ApplicationFiled: February 9, 2007Publication date: February 12, 2009Applicant: Dongjin Semichem Co., Ltd.Inventors: Jin wook Choi, Eung jae Park, Jae cheol Park, Yong bae Kim
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Publication number: 20090029072Abstract: Disclosed is a polyimide resin composition which is composed of an acid dianhydride and a diamine compound and has a long-chain alkyl group in a side chain of the polyimide skeleton. The polyimide resin composition contains an aromatic component so that the weight ratio of the aromatic component relative to the total weight of the polyimide is not more than 20% (excluding 0%).Type: ApplicationFiled: October 18, 2005Publication date: January 29, 2009Inventors: Kenichiro Fujimoto, Hiroyuki Kagawa, Yuki Honda
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Patent number: 7476424Abstract: A liquid crystal display device has no defects caused by a rubbing process. The liquid crystal display device includes a first substrate, a second substrate, a liquid crystal layer injected between the first substrate and the second substrate, and a liquid crystal alignment layer that arranges alkane chains having at least 18 carbon atoms in parallel toward the substrate. The siloxane-based liquid crystalline alignment layer produces a uniform layer that resists defects and delamination.Type: GrantFiled: December 20, 2005Date of Patent: January 13, 2009Assignee: LG Philips LCD Co., Ltd.Inventors: Ho-Young Jeong, Hyeon-Ho Son
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Patent number: 7430033Abstract: A liquid crystal display device includes a pair of substrates, a liquid crystal between substrates and alignment layers disposed on the inner surface sides of the substrates. The alignment layer is made from a material including polyamic acid containing a diamine component and polyimide containing a diamine component different from the diamine component of the polyamic acid. The alignment layer is subjected to alignment treatment by irradiation of light. UV light can be irradiated in the oblique direction onto the alignment layer through a mask having openings. A reflecting plate can be arranged between a UV light source and the mask. Also, bank structures having a thickness from 0.1 to 0.15 ?m can be provided on the alignment layer of the TFT substrate.Type: GrantFiled: June 21, 2007Date of Patent: September 30, 2008Assignee: Sharp Kabushiki KaishaInventors: Hideo Chida, Hidefumi Yoshida, Yasutoshi Tasaka
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Publication number: 20080213510Abstract: A liquid crystal aligning agent suitable for use in the production of a liquid crystal display device is provided. The liquid crystal aligning agent comprises at least one polymer selected from a polyamic acid and a soluble polyimide, an aprotic polar solvent and monoethylene glycol dimethyl ether or dipropylene glycol dimethyl ether. The liquid crystal aligning agent has satisfactory printability. Further provided is a liquid crystal alignment layer formed using the aligning agent. The liquid crystal alignment layer is highly uniform.Type: ApplicationFiled: December 31, 2007Publication date: September 4, 2008Applicant: CHEIL INDUSTRIES INC.Inventors: Tae Hyoung KWAK, Jong Seob KIM, Jae Min OH, Jae Deuk YANG, Jeong Hoon KANG, Won Seok DONG, Ji Young JEONG, Sun Nyo YU
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Patent number: 7396572Abstract: A liquid crystal display includes; a first and a second display panel facing each other, an alignment layer formed on at least one of the first and the second display panels and including a polyamic acid moieties and a polyimide moieties which form a block copolymer, and a liquid crystal layer interposed between the first display panel and the second display panel.Type: GrantFiled: September 14, 2006Date of Patent: July 8, 2008Assignee: Samsung Electronics Co., Ltd.Inventors: Yeon-Cu Kim, Hyang-Shik Kong, Young-Kuil Joo, Young-Geol Song
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Publication number: 20080160222Abstract: The invention relates to an alignment layer with improved adhesion to liquid crystal (LC) films, to a precursor material used for the preparation of such a layer, to a laminate comprising such a layer and at least one LC polymer film, and to the use of the alignment layer and the laminate for optical, electrooptical, decorative or security uses and devices, wherein the alignment layer and the precursor material comprise at least one reactive mesogen in monomeric, oligomeric or polymeric form.Type: ApplicationFiled: July 26, 2004Publication date: July 3, 2008Inventors: Richard Harding, Alison Linda May, Simon Greenfield, Johan Lub, Ciska Doornkamp, Rene Theodorus Wegh