Patents by Inventor Dong-Chang Choi
Dong-Chang Choi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10642150Abstract: The present invention relates to a photomask and a method for manufacturing a column spacer for a color filter using the same, and according to one aspect of the present invention, a photomask is provided, which comprises a central region having a first transmittance, a first perimeter region surrounding the central region and having a second transmittance lower than the first transmittance, and a second perimeter region surrounding the first perimeter region and having the first transmittance.Type: GrantFiled: March 31, 2017Date of Patent: May 5, 2020Assignee: LG CHEM, LTD.Inventors: Dae Han Seo, Dong Chang Choi, Kwang Han Park, Sang Choll Han, Jae Jin Kim, Eun Joo Choi, Min Soo Song
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Publication number: 20170285459Abstract: The present invention relates to a photomask and a method for manufacturing a column spacer for a color filter using the same, and according to one aspect of the present invention, a photomask is provided, which comprises a central region having a first transmittance, a first perimeter region surrounding the central region and having a second transmittance lower than the first transmittance, and a second perimeter region surrounding the first perimeter region and having the first transmittance.Type: ApplicationFiled: March 31, 2017Publication date: October 5, 2017Applicant: LG CHEM, LTD.Inventors: Dae Han SEO, Dong Chang Choi, Kwang Han Park, Sang Choll Han, Jae Jin Kim, Eun Joo Choi, Min Soo Song
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Patent number: 8822132Abstract: A colored dispersion according to the present invention comprises a resin including monomers of Formulas 1 to 4, as a binder resin. Accordingly, a photoresist composition for a black matrix of a high light shielding property, which has the dispersion stability of the colored dispersion according to the present invention, could be provided, and a black matrix of high sensibility having an uniform process characteristic while maintaining a high light-shielding property could be produced.Type: GrantFiled: November 10, 2008Date of Patent: September 2, 2014Assignee: LG Chem, Ltd.Inventors: Dong-Chang Choi, Kyung-Soo Choi, Ho-Chan Ji, Geun-Young Cha, Min-Young Lim, Sung-Hyun Kim, Han-Soo Kim, Yoon-Hee Heo, Ji-Heum Yoo
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Patent number: 8822127Abstract: A photosensitive resin composition for a black matrix and a black matrix formed with the same are provided. The photosensitive resin composition for a black matrix includes a solvent consisting of 5-30 weight % of a first solvent having a boiling point of 110-159° C., 55-90 weight % of a second solvent having a boiling point of 160-200° C., and 3-15 weight % of a third solvent having a boiling point of 201-280° C., and the first solvent, the second solvent, and the third solvent are an aliphatic compound and use at least one solvent composition selected from a group consisting of alkyl ester, alkyl ketone, alkyl ether, and alkyl alcohol, and thus a uniform thin film having no surface defect can be obtained, and the photosensitive resin composition has an excellent process property while securing a high light shielding property and thus a black matrix pattern having a few defect can be obtained, and is thus useful for a liquid crystal display.Type: GrantFiled: September 28, 2009Date of Patent: September 2, 2014Assignee: LG Chem, Ltd.Inventors: Dong Chang Choi, Kyung Soo Choi, Ho Chan Ji, Geun Young Cha, Sung-Hyun Kim
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Patent number: 8597861Abstract: The present invention relates to a method for manufacturing a color filter and a color filter manufactured by using the same. More particularly, the present invention pertains to a method for manufacturing a color filter, which includes performing plasma treatment of a black matrix (BM) pattern formed on a substrate to increase a difference in ink repellency of the black matrix pattern and a pixel unit, and a color filter manufactured by using the same. When the production method of the present invention is used, it is possible to provide the color filter in which color mixing does not occur in a pixel unit or between pixel units during discharging of ink by using an inkjet printing process, discoloration due to unfilling does not occur, a surface is uniform, and there is an insignificant step in the pixel unit or between the pixel units.Type: GrantFiled: March 6, 2008Date of Patent: December 3, 2013Assignee: LG Chem, Ltd.Inventors: Dae-Hyun Kim, Dong-Chang Choi, Kyung-Soo Choi, Ho-Chan Ji, Hyun-Sik Kim, Geun-Young Cha, Sung-Hyun Kim, Jae-Joon Kim, Min-A Yu, Mi-Ae Kim, Mi-Kyoung Kim
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Patent number: 8535874Abstract: Provided is a novel fluorene-based polymer having urethane bonds and a method for preparing the fluorene-based polymer. According to the method, a diol compound is condensed with a diisocyanate instead of an acid dianhydride, and then an acid anhydride is reacted with the reaction mixture to introduce desired acid groups into the final polymer. Further provided is a negative-type photosensitive resin composition comprising of the fluorene-based polymer as a binder resin. The composition exhibits improved chemical resistance, good development margin and high sensitivity due to presence of the acid groups despite the low molecular weight of the fluorene-based polymer.Type: GrantFiled: September 26, 2008Date of Patent: September 17, 2013Assignee: LG Chem, Ltd.Inventors: Han Soo Kim, Sung Hyun Kim, Dong Chang Choi, Kyung Soo Choi, Ho Chan Ji, Min Young Lim, Geun Young Cha, Yoon Hee Heo, Ji Heum Yoo, Sun Hwa Kim
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Patent number: 8448692Abstract: A mold and method for gravity casting may integrally cast a turbine housing having a twin scroll unit and a bypass unit and an exhaust manifold having a plurality of exhaust runner units. A turbine housing-side riser may be formed based on the end portion of the twin scroll unit within a first mold and a second mold in the state where the cavity of the turbine housing is formed so that the end portion of the twin scroll unit which is the outlet of the turbine housing is upward disposed.Type: GrantFiled: June 22, 2012Date of Patent: May 28, 2013Assignees: Hyundai Motor Company, Kia Motors Corporation, Samshin Precision Co., Ltd.Inventors: Dong Ho Chu, Dong-chang Choi, Jae-yong Lee
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Publication number: 20120285649Abstract: A mold and method for gravity casting may integrally cast a turbine housing having a twin scroll unit and a bypass unit and an exhaust manifold having a plurality of exhaust runner units. A turbine housing-side riser may be formed based on the end portion of the twin scroll unit within a first mold and a second mold in the state where the cavity of the turbine housing is formed so that the end portion of the twin scroll unit which is the outlet of the turbine housing is upward disposed.Type: ApplicationFiled: June 22, 2012Publication date: November 15, 2012Applicants: Hyundai Motor Company, Samshin Precision Co., Ltd., Kia Motors CorporationInventors: Dong Ho Chu, Dong-chang Choi, Jae-yong Lee
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Patent number: 8267151Abstract: A mold and method for gravity casting may integrally cast a turbine housing having a twin scroll unit and a bypass unit and an exhaust manifold having a plurality of exhaust runner units. A turbine housing-side riser may be formed based on the end portion of the twin scroll unit within a first mold and a second mold in the state where the cavity of the turbine housing is formed so that the end portion of the twin scroll unit which is the outlet of the turbine housing is upward disposed.Type: GrantFiled: September 21, 2011Date of Patent: September 18, 2012Assignees: Hyundai Motor Company, Kia Motors Corporation, Samshin Precision Co., Ltd.Inventors: Dong Ho Chu, Dong-chang Choi, Jae-yong Lee
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Publication number: 20120145350Abstract: A mold and method for gravity casting may integrally cast a turbine housing having a twin scroll unit and a bypass unit and an exhaust manifold having a plurality of exhaust runner units. A turbine housing-side riser may be formed based on the end portion of the twin scroll unit within a first mold and a second mold in the state where the cavity of the turbine housing is formed so that the end portion of the twin scroll unit which is the outlet of the turbine housing is upward disposed.Type: ApplicationFiled: September 21, 2011Publication date: June 14, 2012Applicants: Hyundai Motor Company, Samshin Precision Co., Ltd., Kia Motors CorporationInventors: Dong Ho Chu, Dong-chang Choi, Jae-yong Lee
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Publication number: 20110151379Abstract: The present invention relates to a black matrix photosensitive resin composition having high light-shielding and improved adhesion properties and a black matrix for a liquid crystal display including the same. The black matrix photosensitive resin composition comprises an alkali-soluble binder resin, a multi-functional monomer having an ethylenic unsaturated double bond, a photopolymerization initiator, an adhesion accelerator, a solvent, and a colorant comprising black pigments. A Cardo type binder is mixed in an amount of 10 to 90 wt % and an acryl type binder is mixed in an amount of 10 to 90 wt % based on a total weight of the alkali-soluble binder resin including the Cardo type binder and the acryl type binder.Type: ApplicationFiled: December 10, 2010Publication date: June 23, 2011Applicant: LG CHEM, LTD.Inventors: Dong Chang Choi, Kyung Soo Choi, Ho Chan Ji, Geun Young Cha, Sang Chul Lee
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Publication number: 20110101268Abstract: A photosensitive resin composition for a black matrix and a black matrix formed with the same are provided. The photosensitive resin composition for a black matrix includes a solvent consisting of 5-30 weight % of a first solvent having a boiling point of 110-159° C., 55-90 weight % of a second solvent having a boiling point of 160-200° C., and 3-15 weight % of a third solvent having a boiling point of 201-280° C., and the first solvent, the second solvent, and the third solvent are an aliphatic compound and use at least one solvent composition selected from a group consisting of alkyl ester, alkyl ketone, alkyl ether, and alkyl alcohol, and thus a uniform thin film having no surface defect can be obtained, and the photosensitive resin composition has an excellent process property while securing a high light shielding property and thus a black matrix pattern having a few defect can be obtained, and is thus useful for a liquid crystal display.Type: ApplicationFiled: September 28, 2009Publication date: May 5, 2011Applicant: LG CHEM, LTD.Inventors: Dong Chang Choi, Kyung Soo Choi, Ho Chan Ji, Geun Young Cha, Sung-Hyun Kim
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Publication number: 20100201925Abstract: Provided is a novel fluorene-based polymer having urethane bonds and a method for preparing the fluorene-based polymer. According to the method, a diol compound is condensed with a diisocyanate instead of an acid dianhydride, and then an acid anhydride is reacted with the reaction mixture to introduce desired acid groups into the final polymer. Further provided is a negative-type photosensitive resin composition comprising of the fluorene-based polymer as a binder resin. The composition exhibits improved chemical resistance, good development margin and high sensitivity due to presence of the acid groups despite the low molecular weight of the fluorene-based polymer.Type: ApplicationFiled: September 26, 2008Publication date: August 12, 2010Applicant: LG CHEM LTD.Inventors: Han Soo Kim, Sung Hyun Kim, Dong Chang Choi, Kyung Soo Choi, Ho Chan Ji, Min Young Lim, Geun Young Cha, Yoon Hee Heo, Ji Heum Yoo, Sun Hwa Kim
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Publication number: 20100104981Abstract: A colored dispersion according to the present invention comprises a resin including monomers of Formulas 1 to 4, as a binder resin. Accordingly, a photoresist composition for a black matrix of a high light shielding property, which has the dispersion stability of the colored dispersion according to the present invention, could be provided, and a black matrix of high sensibility having an uniform process characteristic while maintaining a high light-shielding property could be produced.Type: ApplicationFiled: November 10, 2008Publication date: April 29, 2010Inventors: Dong Chang Choi, Kyung Soo Choi, Ho Chan Ji, Geun Young Cha, Min Young Lim, Sung Hyun Kim, Han soo Kim, Yoon Hee Heo, Ji Heum Yoo
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Publication number: 20100085518Abstract: The present invention relates to a photosensitive resin composition for a black matrix, a black matrix produced by the composition and a liquid crystal display including the black matrix. The resin composition for a black matrix comprising a fluorene-based resin polymer as a resin binder has high sensitivity and optical density, and excellent development adherence.Type: ApplicationFiled: February 21, 2008Publication date: April 8, 2010Inventors: Kyung-Soo Choi, Yoon-Hee Heo, Dong-Chang Choi, Ho-Chan Ji, Geun-Young Cha, Dae-Hyun Kim
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Publication number: 20100062377Abstract: The present invention relates to a method for manufacturing a color filter and a color filter manufactured by using the same. More particularly, the present invention pertains to a method for manufacturing a color filter, which includes performing plasma treatment of a black matrix (BM) pattern formed on a substrate to increase a difference in ink repellency of the black matrix pattern and a pixel unit, and a color filter manufactured by using the same. When the production method of the present invention is used, it is possible to provide the color filter in which color mixing does not occur in a pixel unit or between pixel units during discharging of ink by using an inkjet printing process, discoloration due to unfilling does not occur, a surface is uniform, and there is an insignificant step in the pixel unit or between the pixel units.Type: ApplicationFiled: March 6, 2008Publication date: March 11, 2010Applicant: LG CHEM, LTD.Inventors: Dae-Hyun Kim, Dong-Chang Choi, Kyung-Soo Choi, Ho-Chan Ji, Hyun-Sik Kim, Geun-Young Cha, Sung-Hyun Kim, Jae-Joon Kim, Min-A Yu, Mi-Ae Kim, Mi-Kyoung Kim
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Ink composition, color filter manufactured by using the same, and display device comprising the same
Publication number: 20090284698Abstract: The present invention relates to an ink composition, and more particularly, to an ink composition that comprises a) a binder polymer; b) a polymerizable compound that has an ethylenical unsaturation bond; c) a thermal initiator or photo-initiator; d) I) a solvent that has a boiling point of 180° C. or more, II) a solvent that has a hydroxyl group, and III) a solvent that has a boiling point of less than 180° C.; and e) a pigment, a color filter that is manufactured by using the same, and a display device that includes the same. When the ink composition according to the present invention is used in an inkjet method, it is possible to improve a contrast ratio according to excellent dispersion of fine pigment and improve an initial jetting property by using reduction of volatility.Type: ApplicationFiled: May 14, 2009Publication date: November 19, 2009Inventors: Mi-Kyoung Kim, Dae-Hyun Kim, Hyun-Sik Kim, Duk-Sik Ha, Dong-Chang Choi, Han-Soo Kim, Min-A Yu -
Patent number: 7556910Abstract: The present invention relates to a photosensitive composition comprising a triazine-based photoactive compound containing oxime ester. The photosensitive composition according to the present invention has good sensitivity, retention rate, mechanical strength, heat resistance, chemical resistance and developing durability since it contains, as photopolymerization initiator, a compound having an oxime ester group and a triazine group in one molecule and thus effectively absorbs UV radiation. Therefore, the photosensitive composition according to the present invention is advantageous not only in curing of materials for color filters, resin black matrixes, column spacers, overcoats and passivation films of liquid crystal displays, but also in high temperature process characteristics.Type: GrantFiled: November 29, 2006Date of Patent: July 7, 2009Assignee: LF Chem, Ltd.Inventors: Sung Hyun Kim, Kyung Jun Kim, Dong Chang Choi, Jeong Ae Yoon, Hee Kwan Park, Geun Young Cha, Keon Woo Lee, Il Eok Kwon, Dong Kung Oh, Jong Hyun Park, Xiang Li Li, Han Soo Kim, Min Young Lim, Chang Ho Cho
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Patent number: 6797739Abstract: The preset invention relates to a photosensitive composition, and provides a triazine-based compound comprising new functionalized alkylthio groups of which long term storage characteristics at room temperature as well as photochemical activity as a photopolymerization initiator are superior.Type: GrantFiled: September 27, 2002Date of Patent: September 28, 2004Assignee: LG Chemical Co., Ltd.Inventors: Sung-Hyun Kim, Chul-Woo Lee, Jin-Seuk Kim, Jae-Hwan Lee, Dong-Chang Choi, Hyuk-Jin Cha