Polyimide Patents (Class 428/1.26)
  • Patent number: 10379390
    Abstract: Disclosed is a flexible substrate, which relates to the technical field of display. The flexible substrate includes a first film and a second film arranged from bottom to top in sequence. The second film is arranged to counteract birefringence effect generated by the first film so as to eliminate phase retardation of the flexible substrate. Thus, display effect can be improved, and impacts on a substrate due to increasing of film thickness can also be avoided. Besides, thickness of the flexible substrate can be determined according to actual needs.
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: August 13, 2019
    Assignee: SHENZHEN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD.
    Inventor: Minghui Li
  • Patent number: 10074504
    Abstract: A liquid crystal display device that includes an array substrate, an opposite substrate and a liquid crystal display layer is described. The array substrate includes a pixel electrode and a lower alignment layer. The pixel electrode has a plurality of slit portions extending in different directions. The lower alignment layer includes a reactive mesogen (RM) diamine is formed on the pixel electrode to induce an alignment direction of the liquid crystal molecules. An upper alignment layer is formed on a common electrode of the opposite substrate. The RM is cured at surfaces of the lower and upper alignment layers in response to ultraviolet (UV) light, so that liquid crystal molecules have a pretilt angle. Therefore, the aperture ratio and the response time may be improved, and afterimages may be decreased, so that display quality may be improved.
    Type: Grant
    Filed: January 13, 2015
    Date of Patent: September 11, 2018
    Assignee: Samsung Display Co., Ltd.
    Inventors: Keun-Chan Oh, Jae-Jin Lyu, Ji-Won Sohn, Seon-Ah Cho
  • Patent number: 10061160
    Abstract: A liquid crystal display device is provided. An exemplary embodiment of the present invention provides a liquid crystal display device including: a first substrate; a thin film transistor disposed on the first substrate; a first electrode connected to the thin film transistor; and a first alignment layer disposed on the first electrode. The first alignment layer includes: a copolymer formed from at least one compound of cyclobutane dianhydride (CBDA) and a cyclobutane dianhydride derivative, and a first diaminean including alkylene group (—CkH2k?, k being a natural number); and a cross-linking agent including an alkylene group (—CnH2n?, n being a natural number), wherein the copolymer includes polyimide.
    Type: Grant
    Filed: June 16, 2015
    Date of Patent: August 28, 2018
    Assignee: Samsung Display Co., Ltd.
    Inventors: Suk Hoon Kang, Jun Woo Lee, Jin-Soo Jung, Baek Kyun Jeon, Jong Hwan Jeon
  • Patent number: 10054820
    Abstract: A photoalignment agent includes: a copolymer obtained from at least one of cyclobutane dianhydride (CBDA) and a cyclobutane dianhydride derivative, and a diamine; and a cross-linking agent including an alkylene group —CnH2n—, n being a natural number.
    Type: Grant
    Filed: May 28, 2015
    Date of Patent: August 21, 2018
    Assignee: Samsung Display Co., Ltd.
    Inventors: Suk Hoon Kang, Jun Woo Lee, Jin-Soo Jung, Jong Hwan Jeon, Baek Kyun Jeon
  • Patent number: 10042209
    Abstract: This invention relates to an optical anisotropic film wherein liquid crystals of a liquid crystal layer can be more effectively aligned using a photo-alignment layer, and superior stability of liquid crystal alignment and high interaction between the liquid crystal layer and the photo-alignment layer can be exhibited, and to an optical device including the optical anisotropic film. The optical anisotropic film includes a substrate having P (polarity) of 0.01 to 0.35 as defined by a predetermined equation; a photo-alignment layer formed on the substrate and including a photo-alignment polymer in which at least a portion of a photo-reactive group is optically aligned, with P (polarity) of 0.02 to 0.28; and a liquid crystal layer formed on the photo-alignment layer.
    Type: Grant
    Filed: August 21, 2013
    Date of Patent: August 7, 2018
    Assignee: LG CHEM, LTD.
    Inventors: Sung Kyoung Lee, Dong Woo Yoo, Sung-Ho Chun, Dai Seung Choi
  • Patent number: 9952467
    Abstract: A liquid crystal display is provided. A photo-alignment layer thereof includes a polyimide and a crosslinker including an alkylene group (—CnH2n—, where n is a natural number) and a plurality of crosslinking end groups, wherein the plurality of crosslinking end groups include at least two types of end groups or end group derivatives, each type having a different available functional group.
    Type: Grant
    Filed: January 26, 2016
    Date of Patent: April 24, 2018
    Assignee: Samsung Display Co., Ltd.
    Inventors: Jin-Soo Jung, Suk Hoon Kang, Jong Hwan Jeon, In Ok Kim, Jun Woo Lee, Baek Kyun Jeon
  • Patent number: 9952364
    Abstract: Disclosed therein are an optical film and a display device comprising the same, where the optical film comprises a first optically anisotropic layer including a liquid crystal compound and a second optically anisotropic layer including a photoreactive polymer, thereby securing improved photoreaction rate and excellent liquid crystal alignment.
    Type: Grant
    Filed: August 6, 2013
    Date of Patent: April 24, 2018
    Assignee: LG CHEM, LTD.
    Inventors: Kyung Chang Seo, Sung-Ho Chun, Dai Seung Choi, Mi Ra Hong, Dong Woo Yoo
  • Patent number: 9904113
    Abstract: An alignment composition is presented that includes an alignment polymer and a reactive mesogen. The alignment polymer includes a polyimide backbone and a vertical alignment side chain combined with the polyimide backbone. The reactive mesogen may be represented by the formula M5-M1-M2-M3-M4 in which M1 represents a divalent organic group including an aromatic ring group, M2 represents M3 represents a single bond, —O—, —O—(CH2)a—O—, or —(CH2)a—O—, wherein “a” represents an integer of 1 to 20, M4 represents an alkenyl group or an alkynyl group having a carbon number of 2 to 20 an alkenylcarbonyl group having a carbon number of 3 to 20, an alkenylcarbonyloxy group having a carbon number of 3 to 20, a an oxotetrahydrofuryl group having —(C?CH2)— substituted for at least one —CH2—, or an epoxy group. M5 represents -M2-M3-M4 or -M3-M4.
    Type: Grant
    Filed: July 29, 2015
    Date of Patent: February 27, 2018
    Assignee: Samsung Display Co., Ltd.
    Inventors: Ho Lim, Tae-Hoon Kim, Sung-Yi Kim, Tae-Min Kim
  • Patent number: 9758622
    Abstract: A photoalignment agent includes a polyimide and a capping terminal connected to a main chain end terminal of the polyimide. The capping terminal includes an alkylene group (—CmH2m—, m is a natural number) and a core stereo unit in a dendrimer format. A liquid crystal display includes a first substrate, a thin film transistor disposed on the first substrate, a first electrode connected to the thin film transistor, and a first alignment layer disposed on the first electrode. The first alignment layer includes a polyimide and a capping terminal connected to a main chain end terminal of the polyimide. The capping terminal includes an alkylene group (—CmH2m-, m is a natural number) and a core stereo unit in a dendrimer format.
    Type: Grant
    Filed: August 21, 2015
    Date of Patent: September 12, 2017
    Assignee: Samsung Display Co., Ltd.
    Inventors: Jong Hwan Jeon, Suk Hoon Kang, Jin-Soo Jung, In Ok Kim, Jun Woo Lee, Baek Kyun Jeon
  • Patent number: 9644147
    Abstract: A liquid crystal alignment agent capable of forming a liquid crystal alignment film having good ultraviolet reliability, the liquid crystal alignment film, and a liquid crystal display element having the same are provided. The liquid crystal alignment agent includes a polymer (A) and a solvent (B). The polymer (A) is obtained by reacting a mixture. The mixture includes a tetracarboxylic dianhydride component (a) and a component (b). The component (b) includes a diamine compound (b-1) represented by formula (1), a diamine compound (b-2) represented by formula (2), and a compound (b-3), wherein the compound (b-3) is at least one selected from the group consisting of a structure represented by formula (3-1) and a structure represented by formula (3-2).
    Type: Grant
    Filed: July 24, 2015
    Date of Patent: May 9, 2017
    Assignee: Chi Mei Corporation
    Inventor: Shin-Rong Chiou
  • Patent number: 9459494
    Abstract: 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: Grant
    Filed: September 26, 2013
    Date of Patent: October 4, 2016
    Assignee: NISSAN CHEMICAL INDUSTRIES, LTD.
    Inventors: Kimiaki Tsutsui, Takahiro Sakai, Kohei Goto
  • Patent number: 9388287
    Abstract: The present invention provides a polyimide film having a good transparency and also an excellent thermal resistance so that it is useful in a transparent conductive film, TFT substrate, a flexible printing circuit substrate, and the like.
    Type: Grant
    Filed: March 30, 2011
    Date of Patent: July 12, 2016
    Assignee: KOLON INDUSTRIES, INC.
    Inventors: Young Han Jeong, Hyo Jun Park
  • Patent number: 9261737
    Abstract: A liquid crystal display including: a first substrate; a second substrate facing the first substrate; a liquid crystal layer including a liquid crystal disposed between the first substrate and the second substrate; a thin film transistor disposed on the first substrate; a first electrode connected to the thin film transistor; a second electrode overlapping the first electrode with an insulating layer interposed therebetween; and a first alignment layer disposed on the first electrode. The first alignment layer includes a photo-alignment layer, and the liquid crystal has negative dielectric anisotropy.
    Type: Grant
    Filed: July 17, 2014
    Date of Patent: February 16, 2016
    Assignee: Samsung Display Co., Ltd.
    Inventors: Tae Ho Kim, Mi Suk Kim, So Youn Park, Daisuke Inoue
  • Patent number: 9164025
    Abstract: A method for image sticking inspection of a light-transmissive device is disclosed. The light-transmissive device is responsive to application of a voltage to electrodes thereof to adjust light transmission characteristics. The method includes: providing light for passage through the light-transmissive device; applying a first alternating current (AC) voltage to the electrodes; applying a direct current voltage to the electrodes; and applying a second AC voltage to the electrodes, and measuring intensity of the light passing through the light-transmissive device during application of the second AC voltage.
    Type: Grant
    Filed: April 8, 2013
    Date of Patent: October 20, 2015
    Assignee: Daxin Materials Corp.
    Inventors: Min-Ruei Tasi, Li-Hsin Chang, Chih-Chun Hsu, Kuan-Ming Lin
  • Patent number: 9097939
    Abstract: A liquid crystal display device includes: a pair of substrates at least one of which is transparent; a liquid crystal layer disposed between the pair of substrates; an electrode group formed on at least one substrate of the pair of substrates, for applying an electric field to the liquid crystal layer; a plurality of active elements connected to the electrode group; and a liquid crystal alignment film disposed on at least one substrate of the pair of substrates, in which the liquid crystal alignment film, which is formed by a photo-alignment process, contains polyimide formed using tetracarboxylic acid dianhydride and/or diamine each having a specific chemical structure.
    Type: Grant
    Filed: October 30, 2014
    Date of Patent: August 4, 2015
    Assignees: JAPAN DISPLAY INC., PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD.
    Inventors: Shoichi Uchino, Noboru Kunimatsu, Hidehiro Sonoda, Chikae Matsui, Yuko Matsumoto, Masaki Matsumori, Yasushi Tomioka, Jun Tanaka
  • Patent number: 9052549
    Abstract: A liquid crystal display including: a first substrate and a second substrate facing each other; an alignment layer disposed on one of the first substrate and the second substrate and including a vertical photo-alignment material which includes a first vertical functional group and a photo-reactive group, and a major alignment material which does not include the photo-reactive group; and a liquid crystal layer disposed between the first substrate and the second substrate, wherein a ratio of a molar concentration of the vertical photo-alignment material to the molar concentration of the major alignment material increases in a direction towards a surface of the alignment layer adjacent to the liquid crystal layer.
    Type: Grant
    Filed: January 27, 2012
    Date of Patent: June 9, 2015
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Jun-Woo Lee, Jong-Sung Bae, Hoi-Lim Kim, Baek-Kyun Jeon, Suk-Hoon Kang, Jin-Soo Jung, Soo-Ryun Cho, Hyun Ku Ahn, Joo Seok Yeom, Kyoung Tae Kim, Gyo-Jic Shin, Eun Ju Kim
  • Patent number: 9028926
    Abstract: An IPS type liquid crystal display device superior in mass productivity and improved in image quality with a higher contrast ratio by decreasing the occurrence of defective display due to the disorder of the initial liquid crystal alignment by the liquid orientation control film and realizing stable alignment of liquid crystals comprises: a pair of substrates, at least one which is transparent; a liquid crystal layer disposed between the pair of substrates; a group of electrodes formed on at least one of the pair of substrates to apply an electric field to the liquid crystal layer; plural active elements connected to the group of electrodes; and an orientation control film disposed on at least one of the pair of substrates, wherein said orientation control film is made of a photosensitive polyimide and a polyamide acid ester and is given orientation control ability by being irradiated with substantially linearly polarized light.
    Type: Grant
    Filed: October 23, 2013
    Date of Patent: May 12, 2015
    Assignees: Japan Display Inc., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Masaki Matsumori, Yasushi Tomioka, Noboru Kunimatsu
  • Patent number: 9023440
    Abstract: The invention provides a liquid crystal alignment film, a method for preparing the same and a liquid crystal display device comprising the same. The alignment film comprises a polyimide obtained by reacting a compound as shown in Formula 2 or Formula 3 with an aromatic diamine as shown in Formula 1, wherein the R1, R2, R3, R4, R5, R6, R7, R1?, R2?, R3?, R4?, R5?, R6?, R7?, or R8? is H, an alkyl, an aralkyl or a haloalkyl, and the Ar is an aryl. The liquid crystal alignment film has a tactic spatial configuration, decreases the ?-? attractive interaction between the polyimide backbones, allows the directional and homogenous alignment of the liquid crystal molecules on the surface of the polyimide, and thereby increases the contrast of the liquid crystal display.
    Type: Grant
    Filed: September 7, 2012
    Date of Patent: May 5, 2015
    Assignee: Beijing Boe Optoelectronics Technology Co., Ltd.
    Inventors: Ang Xiao, Haibo Zhu, Sunghun Song, Wei Li, Zhiyong Liu
  • Publication number: 20150064366
    Abstract: The long residual image characteristic of a conventional photo-orientation film material is insufficient. A liquid crystal display device comprises substrates, a liquid crystal layer, an electrode group to apply an electric field to the liquid crystal layer, and orientation control films placed between the substrates and the liquid crystal layer. Each of the orientation control films comprises a polyimide and a polyimide precursor, as materials of the polyimide and the polyimide precursor, at least one kind of first diamines, at least one kind of second diamines, and a cyclobutane tetracarboxylic dianhydride derivative are contained, and an orientation restraining force is granted by the irradiation of nearly linearly polarized light.
    Type: Application
    Filed: September 4, 2014
    Publication date: March 5, 2015
    Inventors: Masaki MATSUMORI, Yasushi TOMIOKA, Noboru KUNIMATSU
  • Patent number: 8968596
    Abstract: The present invention provides a liquid crystal reactive monomer on a polyimide surface of an alignment film and a liquid crystal panel. The liquid crystal reactive monomer has a hard core and is contained in a liquid crystal composition. The liquid crystal reactive monomer is represented by the formula (I) or the formula (II), and the molecular weight thereof is greater than or equal to 300. The solubility of the liquid crystal RMs is significantly improved in a liquid crystal matrix while the returning force of liquid crystal molecules is increased, so as to solve the image sticking issue, increase the polymerization capacity of the liquid crystal molecules, raise the curing speed of the curing reaction between the liquid crystal RMs and the polyimide surface and shorten the curing time, so that the purpose of energy saving and carbon reduction can be achieved.
    Type: Grant
    Filed: June 6, 2012
    Date of Patent: March 3, 2015
    Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd.
    Inventor: Chung-Ching Hsieh
  • Patent number: 8969486
    Abstract: Disclosed are a liquid crystal alignment agent, a liquid crystal alignment film manufactured using the same, and a liquid crystal display including the liquid crystal alignment film. The liquid crystal alignment agent includes a polymer comprising a polyamic acid including a repeating unit represented by Chemical Formula 1, polyimide including a repeating unit represented by Chemical Formula 2, or a combination thereof: wherein Y1 and Y2 are each independently a divalent organic group derived from diamine, wherein the diamine includes photodiamine represented by Chemical Formula 3 and functional diamine represented by Chemical Formula 5: and wherein the other substituents are the same as defined in the detailed description.
    Type: Grant
    Filed: August 22, 2012
    Date of Patent: March 3, 2015
    Assignee: Cheil Industries Inc.
    Inventors: Jae-Deuk Yang, Yong-Sik Yoo, Guk-Pyo Jo
  • Patent number: 8962107
    Abstract: A liquid crystal display device that includes an array substrate, an opposite substrate and a liquid crystal display layer is described. The array substrate includes a pixel electrode and a lower alignment layer. The pixel electrode has a plurality of slit portions extending in different directions. The lower alignment layer includes a reactive mesogen (RM) diamine is formed on the pixel electrode to induce an alignment direction of the liquid crystal molecules. An upper alignment layer is formed on a common electrode of the opposite substrate. The RM is cured at surfaces of the lower and upper alignment layers in response to ultraviolet (UV) light, so that liquid crystal molecules have a pretilt angle. Therefore, the aperture ratio and the response time may be improved, and afterimages may be decreased, so that display quality may be improved.
    Type: Grant
    Filed: January 7, 2010
    Date of Patent: February 24, 2015
    Assignee: Samsung Display Co., Ltd.
    Inventors: Keun-Chan Oh, Jae-Jin Lyu, Ji-Won Sohn, Seon-Ah Cho
  • Publication number: 20140375939
    Abstract: The present invention relates a technique of liquid crystal display, especially to an alignment film applied to a substrate of a liquid crystal display. The alignment film includes a plurality of alignment molecules formed by polymerizing monomers having at least a photosensitive group, and has formula e as wherein the component A and/or the component B in formula e comprise(s) terphenyl. The present invention further provides a method of fabricating the alignment film and a liquid crystal display using the same. Due to the photosensitive group of the monomers, the plurality of alignment molecules can be formed with an appropriated rate, and the alignment film formed thereby has homogeneity. Therefore, the optic quality and overall performance of the liquid crystal display are enhanced.
    Type: Application
    Filed: June 28, 2013
    Publication date: December 25, 2014
    Applicant: Shenzhen China Star Optoelectronics Technology Co., Ltd.
    Inventors: Xinhui Zhong, Kuan-cheng Lee
  • Publication number: 20140375940
    Abstract: The present invention relates a technique of liquid crystal display, especially to an alignment film applied to a substrate of a liquid crystal display. The alignment film includes a plurality of alignment molecules including polyamic acid and/or polyimide and a plurality of photo-sensitive molecules including terphenyl and/or substituted terphenyl, wherein a mass ratio of the plurality of alignment molecules to the plurality of photo-sensitive molecules is 3˜7%:0.0002˜2%. The present invention further provides a method of fabricating the alignment film and a liquid crystal display using the same. Due to the photosensitive group of the monomers, the plurality of alignment molecules can be formed with an appropriated rate, and the alignment film formed thereby has homogeneity. Therefore, the optic quality and overall performance of the liquid crystal display are enhanced.
    Type: Application
    Filed: June 28, 2013
    Publication date: December 25, 2014
    Applicant: Shenzhen China Star Optoelectronics Technology Co., Ltd.
    Inventors: Xinhui Zhong, Kuan-cheng Lee
  • Patent number: 8906473
    Abstract: A liquid crystal display device includes: a pair of substrates at least one of which is transparent; a liquid crystal layer disposed between the pair of substrates; an electrode group formed on at least one substrate of the pair of substrates, for applying an electric field to the liquid crystal layer; a plurality of active elements connected to the electrode group; and a liquid crystal alignment film disposed on at least one substrate of the pair of substrates, in which the liquid crystal alignment film, which is formed by a photo-alignment process, contains polyimide formed using tetracarboxylic acid dianhydride and/or diamine each having a specific chemical structure.
    Type: Grant
    Filed: October 20, 2010
    Date of Patent: December 9, 2014
    Assignees: Japan Display Inc., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Shoichi Uchino, Noboru Kunimatsu, Hidehiro Sonoda, Chikae Matsui, Yuko Matsumoto, Masaki Matsumori, Yasushi Tomioka, Jun Tanaka
  • Patent number: 8906474
    Abstract: Disclosed is a liquid crystal display device including: a first substrate and a second substrate, one of which is transparent; a liquid crystal layer disposed between the first substrate and the second substrate; a group of electrodes for applying an electric field to the liquid crystal layer, which is formed on one of the first substrate and the second substrate; a plurality of active elements connected to the group of electrodes; and an alignment film disposed on one of the first substrate and the second substrate, wherein the alignment film contains a polyimide and a precursor of the polyimide, each of which is formed from a diamine and an acid anhydride, and the diamine contains a first diamine having an acidic group and a second diamine having a nitrogen atom-containing functional group other than two amino groups.
    Type: Grant
    Filed: October 6, 2011
    Date of Patent: December 9, 2014
    Assignee: Japan Display Inc.
    Inventors: Masaki Matsumori, Yasuo Imanishi, Yasushi Tomioka, Noboru Kunimatsu
  • Patent number: 8877303
    Abstract: To form an optical alignment film having large anchoring strength and suppress an AC afterimage of a liquid crystal display device, in a liquid crystal display device of an IPS mode. In an alignment film material subjected to optical alignment processing, polyimide which becomes a rigid high molecule and polyimide which becomes a flexible high molecule are mixed and used. The material of the present invention can easily rotate oligomer after irradiating polarized ultraviolet rays and improve a UV-absorbed two-color ratio of an alignment film. Accordingly, an anchoring strength for liquid crystals by the alignment film is large to suppress an AC afterimage.
    Type: Grant
    Filed: May 9, 2012
    Date of Patent: November 4, 2014
    Assignee: Japan Display Inc.
    Inventors: Shoichi Uchino, Noboru Kunimatsu
  • Patent number: 8865273
    Abstract: A photoalignment compound is represented by the following Chemical Formula 1, wherein “x” represents an integer in a range of 1 to 4, each of R1 and R2 represents —(CH2)n—, “n” represents an integer in a range of 1 to 6, at least one of the (—CH2-)s in R1 is replaceable with R3 represents —(CH2)mCH3, “m” represents an integer in a range of 1 to 12, each hydrogen atom of R3 is replaceable with F or Cl, R4 represents an amino group, aniline group, carboxy group, hydroxyl group, cyano group, alkylene group, or functional groups being represented by the following Chemical Formulas 2, 3, 4, or 5, each hydrogen atom of Chemical Formula 1 is replaceable with —O(CH2)kCH3, —(CH2)kCH3, F, or Cl, and “k” represents an integer in a range of 1 to 3, or 0.
    Type: Grant
    Filed: August 7, 2012
    Date of Patent: October 21, 2014
    Assignee: Samsung Display Co., Ltd.
    Inventors: Sung-Chan Jo, Weon-Eik Oii
  • Patent number: 8859715
    Abstract: A polyimide polymer solution, a polyimide polymer, a transparent film, a display device and a solar cell are provided. The polyimide polymer has at least one of a repeating unit of formula (D) and a repeating unit of formula (J) and at least one of a repeating unit of formula (Q) and a repeating unit of formula (T). One of B and B? is cyclo-aliphatic compound, and the other is aromatic compound, a molar mass ratio of the cyclo-aliphatic compound to the aromatic compound is 1˜4, A and A? are identical or different aromatic diamines, and at least one of A and A? is aromatic diamine with ether groups, and A could be the same as or different from A?.
    Type: Grant
    Filed: December 22, 2011
    Date of Patent: October 14, 2014
    Assignee: Industrial Technology Research Institute
    Inventors: Chyi-Ming Leu, Chih-Cheng Lin, Chi-Fu Tseng, Hsueh-Yi Liao
  • Patent number: 8846852
    Abstract: The present invention provides a polyimide film which is both outstandingly transparent and highly heat resistance, and which can be usefully employed as a transparent electrically conductive film, a TFT substrate, a flexible printed circuit substrate, and the like.
    Type: Grant
    Filed: December 30, 2009
    Date of Patent: September 30, 2014
    Assignee: Kolon Industries, Inc.
    Inventors: Young Han Jeong, Han Moon Cho, Hyo Jun Park
  • Publication number: 20140248445
    Abstract: 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: Application
    Filed: May 9, 2014
    Publication date: September 4, 2014
    Applicants: JAPAN DISPLAY INC., PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD.
    Inventors: Yasushi TOMIOKA, Hidetoshi ABE, Katsumi KONDO
  • Patent number: 8771809
    Abstract: A photoalignment material includes a photoalignment polymer having a photosensitive portion represented by the following Chemical Formula 1, R1 represents a cyclic compound, each of R2 and R3 represents a single bond, —(CnH2n)—, —(CxH2x)O(CyH2y)—, or —(CaH2a)O(CbH2b)O(CdH2d)—, “n” represents an integer in the range of 1 to 6, each of “x”, “y”, “a”, “b”, and “d” represents 0 or an integer in the range of 1 to 6, x+y is an integer in the range of 1 to 5, and a+b+d is an integer in the range of 1 to 6. Each hydrogen atom is replaceable with —CH3, —CH2—CH3, —OCH3, —OCH2CH3, —OCH2OCH3, F, or Cl, and each hydrogen atom of —CH3, —CH2—CH3, —OCH3, —OCH2CH3, or —OCH2OCH3 is replaceable with F or Cl.
    Type: Grant
    Filed: February 24, 2009
    Date of Patent: July 8, 2014
    Assignee: Samsung Display Co., Ltd.
    Inventors: Fusayuki Takeshita, Jun-Woo Lee
  • Patent number: 8758871
    Abstract: 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: Grant
    Filed: August 17, 2011
    Date of Patent: June 24, 2014
    Assignees: Japan Display Inc., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Yasushi Tomioka, Hidetoshi Abe, Katsumi Kondo
  • Patent number: 8747967
    Abstract: A liquid crystal display according to an exemplary embodiment of the present invention includes a first substrate and a second substrate facing each other, an alignment layer disposed on at least one of the first substrate or the second substrate, the alignment layer including at least one vertical alignment monomer and a photo-alignment layer separated from the at least one vertical alignment monomer, and a liquid crystal layer disposed between the first substrate and the second substrate. The photo-alignment layer includes a main chain and at least one side chain connected to the main chain, and the at least one side chain includes at least one vertical photo-alignment material.
    Type: Grant
    Filed: March 28, 2012
    Date of Patent: June 10, 2014
    Assignee: Samsung Display Co., Ltd.
    Inventors: Suk Hoon Kang, Jun Woo Lee, Baek Kyun Jeon, Kyoung Tae Kim, Soo-Ryun Cho
  • Patent number: 8741398
    Abstract: The present invention provides a liquid crystal panel and an alignment film thereof, and the alignment film is made of a modified polyimide which has conjugated double bond at side chain. Resistance value of the alignment film is less than the resistance value of a liquid crystal material of the liquid crystal panel by properties of the conjugated double bond that can reduce the resistance value of a prior art polyimide. In addition, improving the imidization ratio of a modified polyimide alignment film is important. The present invention is conducted the charged ion from liquid crystal layer to the alignment film by the conjugated double bond of the modified polyimide at the side chain to prevent the increase in the ion density of the liquid crystal in part of this area, and improve the problem of image sticking.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: June 3, 2014
    Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd.
    Inventors: Chung-Ching Hsieh, Cheng-ming He
  • Patent number: 8741397
    Abstract: Disclosed is a liquid crystal display element which is composed of a pair of substrates (1) at least one of which is transparent. The liquid crystal display element comprises, between the pair of substrates, a transparent electrode (2), an aligning agent (3) that contains at least reactive monomers and/or oligomers (5), and a liquid crystal layer. The liquid crystal display element is characterized in that an alignment layer is obtained by polymerizing the reactive monomers or oligomers contained in the aligning agent, and the liquid crystal layer is composed of a liquid crystal composition that contains a compound (4) having at least one benzene ring in each molecule, said benzene ring containing at least one fluorine atom and being disubstituted by halogen atoms.
    Type: Grant
    Filed: October 18, 2010
    Date of Patent: June 3, 2014
    Assignees: JNC Corporation, JNC Petrochemical Corporation
    Inventors: Norikatsu Hattori, Atsuko Fujita
  • Publication number: 20140146275
    Abstract: The present invention provides a reactive monomer of liquid crystal on a polyimide surface of an alignment film and a liquid crystal panel. The molecular weight of the reactive monomer of liquid crystal is ranged between 322 and 500, and the UV wavelength for polymerizing and curing the reactive monomer of liquid crystal and the polyimide surface is greater than or equal to 300 nm. The reactive monomer of liquid crystal can lower the interaction between the reactive monomer of liquid crystal and the PI surface of the alignment film, so as to improve the phenomenon of drop Mura defect occurred during implementing the ODF technology. Meanwhile, because the curing speed of polymerization and curing reaction is relatively raised, it can also carry out a purpose of energy saving and carbon reduction.
    Type: Application
    Filed: August 15, 2011
    Publication date: May 29, 2014
    Applicant: Shenzhen China Star Optoelectronics Technology Co., Ltd.
    Inventors: Chung-Ching Hsieh, Chengming He
  • Patent number: 8734917
    Abstract: A liquid crystal display device includes: a pair of substrates, at least one of which is transparent; a liquid crystal layer placed between the pair of substrates; an electrode group, formed on at least one of the pair of substrates, for applying an electric field to the liquid crystal layer; and an alignment control film placed on at least one of the pair of substrates, in which the alignment control film is formed of polyimide and a precursor of the polyimide, each of the polyimide and the precursor of the polyimide contains, as a material, a specific cyclobutanetetracarboxylic acid dianhydride derivative and aromatic diamine, and the alignment control film is provided with alignment capability by photo-alignment treatment.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: May 27, 2014
    Assignees: Japan Display Inc., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Masaki Matsumori, Yasushi Tomioka
  • Patent number: 8722158
    Abstract: Disclosed is a liquid crystal photo-alignment agent and a liquid crystal photo-alignment film manufactured using the same. The liquid crystal photo-alignment agent includes an epoxy compound represented by Chemical Formula 1, and a polymer including a polyamic acid, a polyimide, or a mixture thereof.
    Type: Grant
    Filed: June 2, 2011
    Date of Patent: May 13, 2014
    Assignee: Cheil Industries Inc.
    Inventors: Hyo-Ju Seo, Tae-Hyoung Kwak, Dong-Seon Uh, Jae-Deuk Yang
  • Patent number: 8709285
    Abstract: An ionic compound has the formula (I): in which, R1 is selected from the group consisting of hydrogen, a C1-C20 alkyl, and an aromatic group; R2 is selected from the group consisting of a carbonyl and a C1-C10 alkyl; and R3 is selected from the group consisting of an imidazole ring, a C1-C20 alkyl, an acrylic group, and an aromatic group; X? is selected from the group consisting of Cl?, Br?, I?, NO3?, AlCl4?, BF4?, CF3SO3?, (CF3SO3)?, CF3COO?, CH3COO?, and PF6?; and k is an integer 1 or 2. The ionic compound can be added in a pressure-sensitive adhesive of a polarizer of a liquid crystal display panel to avoid the phenomenon of the static electricity residual when the release film is removed from the pressure-sensitive adhesive.
    Type: Grant
    Filed: September 6, 2010
    Date of Patent: April 29, 2014
    Assignee: BenQ Materials Corporation
    Inventors: Cheng-Chung Liao, Min-Chih Lin
  • Patent number: 8709552
    Abstract: The resin composition of the present invention is a resin composition characterized by including (a) a polyimide, a polybenzoxazole, a polyimide precursor or a polybenzoxazole precursor, (b) 1,5-dihydroxynaphthalene, 1,6-dihydroxynaphthalene, 1,7-dihydroxynaphthalene, or 2,3-dihydroxynaphthalene, and (c) a thermal cross-linking agent having a specific structure. By the use of the resin composition of the present invention, it is possible to reduce the transmittance in the visible region of a cured film while maintaining the transmittance of a resin film before curing.
    Type: Grant
    Filed: January 15, 2010
    Date of Patent: April 29, 2014
    Assignee: Toray Industries, Inc.
    Inventors: Kazuto Miyoshi, Mika Koshino, Masao Tomikawa
  • Patent number: 8704977
    Abstract: The invention provides a liquid crystal cell and method thereof. The cell comprises two opposed substrates and a surfactant-free lyotropic chromonic liquid crystals (LCLC) material disposed therebetween. By using an ammonium compound with LCLC or surface treatment on the substrates, the alignment of the LCLC material can be manipulated as a homeotropic bulk alignment; or a hybrid bulk alignment in which the LCLC alignment is changed from homeotropic bulk alignment in the vicinity of one substrate to planar alignment in the vicinity of another substrate. The cell can be used in biosensing, detection and amplification of ligands, optical devices, and photovoltaics etc.
    Type: Grant
    Filed: March 5, 2008
    Date of Patent: April 22, 2014
    Assignee: Kent State University
    Inventors: Oleg D. Lavrentovich, Yuriy A. Nastyshyn, Vassili G. Nazarenko, Roman M. Vasyuta, Oleksandr P. Boiko, Ye Yin, Sergij V. Shiyanovskii
  • Patent number: 8704985
    Abstract: Disclosed are an alignment layer and a liquid crystal display having the same. The alignment layer comprises a polyimide compound having an azo group and exhibiting optical alignment characteristics and a discotic liquid crystal compound exhibiting optical anisotropy. The liquid crystal display comprises first and second substrates facing each other, liquid crystal aligned between the first and second substrates, and an alignment layer formed on at least one surface of the first and second substrates. The alignment layer is adjacent to the liquid crystal and has optical alignment characteristics and optical anisotropy.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: April 22, 2014
    Assignee: Samsung Display Co., Ltd.
    Inventor: Ki-Chul Shin
  • Patent number: 8691350
    Abstract: An object of the present invention is to provide a liquid crystal display device in which a risk of generation of a image sticking is reduced. A liquid crystal display device (100) of the present invention includes a pair of glass substrates (11) and (21), a liquid crystal layer (30) provided between the pair of glass substrates (11) and (21), an alignment layer (23) provided between the liquid crystal layer (30) and at least one of the pair of glass substrates (11) and (21), and an alignment sustaining layer (24) for defining a direction in which liquid crystal molecules constituting the liquid crystal layer (30) are inclined, the alignment sustaining layer (24) being provided between the alignment layer (23) and the liquid crystal layer (30), the alignment layer (23) and the alignment sustaining layer (24) being covalently bound to each other.
    Type: Grant
    Filed: April 28, 2010
    Date of Patent: April 8, 2014
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masanobu Mizusaki, Youhei Nakanishi
  • Patent number: 8692970
    Abstract: Disclosed is a manufacturing method of a liquid crystal display device which is a manufacturing method of a liquid crystal display device including a liquid crystal alignment film to which an alignment regulating force is imparted by a photo-alignment treatment, including: a film forming step of forming a film containing a polymer whose main chain is cleaved by irradiation with light; a photo-alignment step of imparting an alignment regulating force to the film formed in the film forming step by irradiation of the film with light in an atmosphere of a temperature lower than 100° C.; and a removing step of removing a low-molecular weight component generated by cleaving the main chain of the polymer through the light irradiation after the light irradiation. Also disclosed is a liquid crystal display device manufactured by the manufacturing method.
    Type: Grant
    Filed: November 10, 2010
    Date of Patent: April 8, 2014
    Assignees: Japan Display Inc., Panasonic Liquid Crystal Display Co., Ltd.
    Inventors: Shoichi Uchino, Noboru Kunimatsu, Hidehiro Sonoda, Chikae Matsui, Yuko Matsumoto, Tomio Yaguchi, Toshiki Kaneko, Jun Tanaka
  • Patent number: 8679595
    Abstract: A liquid crystal display device (100) according to the present invention includes: an active matrix substrate (220) having a pixel electrode (224); a counter substrate (240) having a counter electrode (244); a vertical-alignment type liquid crystal layer (260); and alignment sustaining layers (210, 230) provided between the active matrix substrate (220) and the liquid crystal layer (260) and between the counter substrate (240) and the liquid crystal layer (260). The alignment sustaining layers (210, 230) contain a polymerization product (poa) resulting from polymerization of a polyfunctional monomer. At least one of the active matrix substrate and the counter substrate further includes an alignment film (110, 120) located on the liquid crystal layer side, the alignment film (110, 120) containing polyimide (pi) and a polymerization product (pob) resulting from polymerization of a polyfunctional monomer.
    Type: Grant
    Filed: June 25, 2009
    Date of Patent: March 25, 2014
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masanobu Mizusaki, Yohei Nakanishi
  • Patent number: 8681300
    Abstract: 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: Grant
    Filed: March 7, 2013
    Date of Patent: March 25, 2014
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Hideo Chida, Hidefumi Yoshida, Yasutoshi Tasaka
  • Patent number: 8679596
    Abstract: The present invention provides a liquid crystal display device including a first substrate and a second substrate that are arranged to face each other while sandwiching liquid crystal, wherein: a first electrode and plural second electrodes are formed at a pixel area on the first substrate on the liquid crystal side; an alignment layer is provided which includes a first alignment layer formed on the first substrate on the liquid crystal side to cover the second electrodes and a second alignment layer formed on the first alignment layer on the liquid crystal side; the resistance of the second alignment layer is lower than that of the first alignment layer; and the transmittance of the second alignment layer is lower than that of the first alignment layer.
    Type: Grant
    Filed: February 13, 2013
    Date of Patent: March 25, 2014
    Assignee: Japan Display Inc.
    Inventors: Masato Ito, Masato Sakurai, Takeshi Sato
  • Patent number: 8673177
    Abstract: A liquid crystal alignment agent includes a polymer and an organic solvent for dissolving the polymer. The polymer is obtained by subjecting a diamine composition and a tetracarboxylic dianhydride compound to a polymerization reaction. The diamine composition includes a first diamine compound, a second diamine compound, and a third diamine compound as defined in the specification. A liquid crystal alignment film formed from the liquid crystal alignment agent and a liquid crystal display element including the liquid crystal alignment film are also disclosed.
    Type: Grant
    Filed: September 21, 2011
    Date of Patent: March 18, 2014
    Assignee: Chi Mei Corporation
    Inventor: Tsung-Pei Tsai
  • Publication number: 20140072730
    Abstract: Disclosed therein are a photoalignment polyimide copolymer making it easier to form a liquid crystal alignment layer with excellences in alignment properties, thermal and structural stabilities, and adhesiveness to a substrate, and a liquid crystal alignment layer using the same. The photoalignment polyimide copolymer includes all the three types of repeating units each having a defined structure.
    Type: Application
    Filed: August 26, 2013
    Publication date: March 13, 2014
    Applicant: LG Chem, Ltd.
    Inventors: Seung-Yeon HWANG, Sung-Ho CHUN, Dong-Woo YOO, Hyeong-Bin JANG