Patents by Inventor Masatoshi Tomonaga
Masatoshi Tomonaga 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: 8668801Abstract: A method for producing a laminated optical film that allows three-dimensional images to be reproduced, which is preferably used in a large image display apparatus. One embodiment of the method includes laminating a polarizing plate and a ?/4 plate and forming a ?/2 layer partially on the ?/4 plate. The polarizing plate and the ?/4 plate are laminated such that an angle between an absorption axis of a polarizer of the polarizing plate and a slow axis of the ?/4 plate is substantially 45°, and the ?/2 layer is formed such that an angle between the absorption axis of the polarizer and a slow axis of the ?/2 layer is substantially 45°.Type: GrantFiled: January 7, 2011Date of Patent: March 11, 2014Assignee: Nitto Denko CorporationInventors: Ikuo Kawamoto, Masatoshi Tomonaga, Yuuji Saiki
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Patent number: 8587756Abstract: A laminated optical film according to an embodiment of the present invention includes a polarizer; a first optical compensation layer which has a refractive index ellipsoid showing a relationship of nx>ny>nz; and a second optical compensation layer which has a refractive index ellipsoid showing a relationship of nz>nx>ny, wherein the polarizer and the first optical compensation layer are placed so that an absorption axis of the polarizer is parallel to or perpendicular to a slow axis of the first optical compensation layer, and the polarizer and the second optical compensation layer are placed so that an absorption axis of the polarizer is parallel to or perpendicular to a slow axis of the second optical compensation layer.Type: GrantFiled: March 27, 2009Date of Patent: November 19, 2013Assignee: Nitto Denko CorporationInventors: Misaki Sabae, Masatoshi Tomonaga, Naoki Koishi, Masato Bitou
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Patent number: 8421965Abstract: The present invention provides a color liquid crystal panel in an e-mode of an IPS mode, which has a multi-gap structure, and in which a contrast in an oblique direction is enhanced.Type: GrantFiled: May 19, 2008Date of Patent: April 16, 2013Assignee: Nitto Denko CorporationInventors: Shouhei Maezawa, Masatoshi Tomonaga, Hiroyuki Takemoto
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Patent number: 8363187Abstract: The present invention provides a color liquid crystal panel in an o-mode of an IPS mode, which has a multi-gap structure, and in which a contrast in an oblique direction is enhanced. A first polarizer 1 is provided on a color filter 6 side of a liquid crystal cell 10 and a second polarizer 8 is provided on a liquid crystal layer 5 side of the liquid crystal cell 10. Further, a retardation film 2 is provided between the second polarizer 8 and the liquid crystal cell 10. The liquid crystal cell 10 has a configuration in which the color filter 6 is laminated on a glass substrate 3, and a liquid crystal layer 5 is interposed between the color filter 6 and a glass substrate 7. Regarding the thickness of the liquid crystal layer 5, a thickness dB of a region in contact with the blue color filter 6B is smallest, and a thickness dG of a region in contact with the green color filter 6G and a thickness dR of a region in contact with the red color filter 6R increase in this order.Type: GrantFiled: May 19, 2008Date of Patent: January 29, 2013Assignee: Nitto Denko CorporationInventors: Shouhei Maezawa, Masatoshi Tomonaga, Hiroyuki Takemoto
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Patent number: 8274627Abstract: The invention provides a liquid crystal panel and a liquid crystal display device, which has suppressed light leakage at an angle of 45 degrees to an absorption axis of a polarizing plate, a low black-state brightness in an oblique direction and an improved contrast.Type: GrantFiled: November 18, 2008Date of Patent: September 25, 2012Assignee: Nitto Denko CorporationInventors: Masatoshi Tomonaga, Hiroyuki Takemoto
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Publication number: 20110222262Abstract: A main object of the present invention is to provide a method of producing a laminated optical film that allows three-dimensional images to be reproduced, which is preferably used, particularly, in a large image display apparatus. A method of producing a laminated optical film according to an embodiment of the present invention includes laminating a polarizing plate and a ?/4 plate and forming a ?/2 layer partially on the ?/4 plate. The polarizing plate and the ?/4 plate are laminated so that an angle between an absorption axis of a polarizer of the polarizing plate and a slow axis of the ?/4 plate is substantially 45°, and the ?/2 layer is formed so that an angle between the absorption axis of the polarizer and a slow axis of the ?/2 layer is substantially 45°.Type: ApplicationFiled: January 7, 2011Publication date: September 15, 2011Applicant: NITTO DENKO CORPORATIONInventors: Ikuo Kawamoto, Masatoshi Tomonaga, Yuuji Saiki
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Patent number: 7929086Abstract: A laminated film includes a polarizing plate, a retardation film, and a first pressure-sensitive adhesive layer provided in this order, wherein the polarizing plate includes a polarizer, a first protective layer placed on a side of the polarizer where the retardation film is provided, and a second protective layer placed on another side of the polarizer which is opposite to the side where the retardation film is provided, the retardation film is a stretched film comprising a norbornene resin, the first pressure-sensitive adhesive layer includes a pressure-sensitive adhesive that may be produced by crosslinking a composition comprising a (meth)acrylate (co)polymer and a crosslinking agent comprising a peroxide as a main component. The laminated film has both good adhesion to a liquid crystal cell and easy peelability, and may improve the uniformity in a screen of liquid crystal display.Type: GrantFiled: September 14, 2006Date of Patent: April 19, 2011Assignee: Nitto-Denko CorporationInventors: Yuusuke Toyama, Masayuki Satake, Kenji Yoda, Masatoshi Tomonaga, Shuuji Yano
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Patent number: 7852441Abstract: A liquid crystal panel of the present invention comprises at least: a liquid crystal cell comprising a liquid crystal layer containing a liquid crystal molecule that is oriented in homogeneous alignment with no electric field applied thereto; a first polarizer placed on one side of the liquid crystal cell; a first optical element placed between the liquid crystal cell and the first polarizer; and a second polarizer placed on the other side of the liquid crystal cell, wherein the first optical element is substantially optically isotropic, the liquid crystal cell has an initial alignment direction that is substantially parallel to the direction of an absorption axis of the first polarizer, and the absorption axis of the first polarizer is substantially perpendicular to an absorption axis of the second polarizer. The liquid crystal panel shows less discoloration of images even when the screen is viewed from oblique directions.Type: GrantFiled: June 22, 2006Date of Patent: December 14, 2010Assignee: Nitto Denko CorporationInventors: Shuuji Yano, Kenji Yoda, Kentarou Kobayashi, Masatoshi Tomonaga
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Publication number: 20100309414Abstract: The invention provides a liquid crystal panel and a liquid crystal display device, which has suppressed light leakage at an angle of 45 degrees to an absorption axis of a polarizing plate, a low black-state brightness in an oblique direction and an improved contrast.Type: ApplicationFiled: November 18, 2008Publication date: December 9, 2010Applicant: NITTO DENKO CORPORATIONInventors: Masatoshi Tomonaga, Hiroyuki Takemoto
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Patent number: 7812902Abstract: There is provided a liquid crystal panel and a liquid crystal display apparatus in which light leakage occurring from a peripheral portion of a screen is small, and which has excellent display uniformity in a high humidity environment. A liquid crystal panel according to an embodiment of the present invention includes: a liquid crystal cell; a first polarizing plate placed on a viewer side of the liquid crystal cell; and a second polarizing plate placed on an opposite side of the viewer side of the liquid crystal cell, wherein a dimensional change ratio (C1) of the first polarizing plate is larger than a dimensional change ratio (C2) of the second polarizing plate.Type: GrantFiled: March 20, 2007Date of Patent: October 12, 2010Assignee: Nitto Denko CorporationInventors: Yoshiyuki Kiya, Shuuji Yano, Kenji Yoda, Kentarou Kobayashi, Masatoshi Tomonaga, Shouhei Maezawa, Yusuke Toyama
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Publication number: 20100231832Abstract: The present invention provides a color liquid crystal panel in an e-mode of an IPS mode, which has a multi-gap structure, and in which a contrast in an oblique direction is enhanced. A first polarizer 1 is provided on a color filter 6 side of a liquid crystal cell 10 and a second polarizer 8 is provided on a liquid crystal layer 5 side of the liquid crystal cell 10. Further, a retardation film 2 is provided between the first polarizer 1 and the liquid crystal cell 10. The liquid crystal cell 10 has a configuration in which the color filter 6 is laminated on a glass substrate 3, and a liquid crystal layer 5 is interposed between the color filter 6 and a glass substrate 7. Regarding the thickness of the liquid crystal layer 5, a thickness dB of a region in contact with the blue color filter 6B is smallest, and a thickness dG of a region in contact with the green color filter 6G and a thickness dR of a region in contact with the red color filter 6R increase in this order.Type: ApplicationFiled: May 19, 2008Publication date: September 16, 2010Applicant: NITTO DENKO CORPORATIONInventors: Shouhei Maezawa, Masatoshi Tomonaga, Hiroyuki Takemoto
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Patent number: 7782429Abstract: Provided are a liquid crystal panel capable of constituting a liquid crystal display apparatus in which a contrast and a display color are unlikely to change depending upon a viewing angle and an azimuth, and a liquid crystal display apparatus using the liquid crystal panel.Type: GrantFiled: January 31, 2007Date of Patent: August 24, 2010Assignee: Nitto Denko CorporationInventors: Masatoshi Tomonaga, Naoto Ooe, Kenji Yoda, Shuuji Yano
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Publication number: 20100182550Abstract: The present invention provides a color liquid crystal panel in an o-mode of an IPS mode, which has a multi-gap structure, and in which a contrast in an oblique direction is enhanced. A first polarizer 1 is provided on a color filter 6 side of a liquid crystal cell 10 and a second polarizer 8 is provided on a liquid crystal layer 5 side of the liquid crystal cell 10. Further, a retardation film 2 is provided between the second polarizer 8 and the liquid crystal cell 10. The liquid crystal cell 10 has a configuration in which the color filter 6 is laminated on a glass substrate 3, and a liquid crystal layer 5 is interposed between the color filter 6 and a glass substrate 7. Regarding the thickness of the liquid crystal layer 5, a thickness dB of a region in contact with the blue color filter 6B is smallest, and a thickness dG of a region in contact with the green color filter 6G and a thickness dR of a region in contact with the red color filter 6R increase in this order.Type: ApplicationFiled: May 19, 2008Publication date: July 22, 2010Applicant: NITTO DENKO CORPORATIONInventors: Shouhei Maezawa, Masatoshi Tomonaga, Hiroyuki Takemoto
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Publication number: 20100157205Abstract: There is provided a liquid crystal panel and a liquid crystal display apparatus in which light leakage occurring from a peripheral portion of a screen is small, and which has excellent display uniformity in a high humidity environment. A liquid crystal panel according to an embodiment of the present invention includes: a liquid crystal cell; a first polarizing plate placed on a viewer side of the liquid crystal cell; and a second polarizing plate placed on an opposite side of the viewer side of the liquid crystal cell, wherein a dimensional change ratio (C1) of the first polarizing plate is larger than a dimensional change ratio (C2) of the second polarizing plate.Type: ApplicationFiled: March 20, 2007Publication date: June 24, 2010Applicant: NITTO DENKO CORPORATIONInventors: Yoshiyuki Kiya, Shuuji Yano, Kenji Yoda, Kentarou Kobayashi, Masatoshi Tomonaga, Shouhei Maezawa, Yusuke Toyama
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Publication number: 20090279030Abstract: A laminated film includes a polarizing plate, a retardation film, and a first pressure-sensitive adhesive layer provided in this order, wherein the polarizing plate includes a polarizer, a first protective layer placed on a side of the polarizer where the retardation film is provided, and a second protective layer placed on another side of the polarizer which is opposite to the side where the retardation film is provided, the retardation film is a stretched film comprising a norbornene resin, the first pressure-sensitive adhesive layer includes a pressure-sensitive adhesive that may be produced by crosslinking a composition comprising a (meth)acrylate (co)polymer and a crosslinking agent comprising a peroxide as a main component. The laminated film has both good adhesion to a liquid crystal cell and easy peelability, and may improve the uniformity in a screen of liquid crystal display.Type: ApplicationFiled: September 14, 2006Publication date: November 12, 2009Applicant: NITTO DENKO CORPORATIONInventors: Yuusuke Toyama, Masayuki Satake, Kenji Yoda, Masatoshi Tomonaga, Shuuji Yano
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Publication number: 20090257012Abstract: A laminated optical film according to an embodiment of the present invention includes a polarizer; a first optical compensation layer which has a refractive index ellipsoid showing a relationship of nx>ny>nz; and a second optical compensation layer which has a refractive index ellipsoid showing a relationship of nz>nx>ny, wherein the polarizer and the first optical compensation layer are placed so that an absorption axis of the polarizer is parallel to or perpendicular to a slow axis of the first optical compensation layer, and the polarizer and the second optical compensation layer are placed so that an absorption axis of the polarizer is parallel to or perpendicular to a slow axis of the second optical compensation layer.Type: ApplicationFiled: March 27, 2009Publication date: October 15, 2009Applicant: NITTO DENKO CORPORATIONInventors: Misaki SABAE, Masatoshi TOMONAGA, Naoki KOISHI, Masato BITOU
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Patent number: 7602462Abstract: It is the object of the present invention to provide a polarizing element capable of increasing a contrast ratio in an oblique direction and reducing a color shift in an oblique direction of a liquid crystal display apparatus. A polarizing element according to the present invention includes a polarizer, a negative C plate, a positive A plate, and a positive C plate each arranged on one side of the polarizer. The positive A plate is arranged between the polarizer and the positive C plate such that a slow axis of the positive A plate is substantially perpendicular to an absorption axis of the polarizer. The positive C plate has RthPC[590] of ?60 nm or less.Type: GrantFiled: February 15, 2006Date of Patent: October 13, 2009Assignee: Nitto Denko CorporationInventors: Naoki Koishi, Shuuji Yano, Kenji Yoda, Kentarou Kobayashi, Masatoshi Tomonaga, Naoto Ooe
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Publication number: 20090207349Abstract: A liquid crystal panel of the present invention comprises a liquid crystal cell, a first polarizing plate arranged on one of both sides of the liquid crystal cell, and a second polarizing plate arranged on the other side of the liquid crystal cell, wherein the liquid crystal cell comprises red, green and blue color filters, and a liquid crystal layer. The liquid crystal layer has a multigap structure satisfying the following relationship: dR?dG>dB. The first polarizing plate comprises a first polarizer and a first protective layer arranged on the liquid crystal cell side of the first polarizer, and in the first protective layer, the index ellipsoid thereof satisfies the following relationship: nx>ny?nz. In a liquid crystal display having the liquid crystal panel, the color shift thereof can be made smaller in oblique directions and display characteristics can be excellent.Type: ApplicationFiled: October 16, 2007Publication date: August 20, 2009Applicant: NITTO DENKO CORPORATIONInventors: Hiroyuki Yoshimi, Tadayuki Kameyama, Masatoshi Tomonaga, Masaki Hayashi
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Publication number: 20090002606Abstract: Provided are a liquid crystal panel capable of constituting a liquid crystal display apparatus in which a contrast and a display color are unlikely to change depending upon a viewing angle and an azimuth, and a liquid crystal display apparatus using the liquid crystal panel.Type: ApplicationFiled: January 31, 2007Publication date: January 1, 2009Applicant: NITTO DENKO CORPORATIONInventors: Masatoshi Tomonaga, Naoto Ooe, Kenji Yoda, Shuuji Yano
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Publication number: 20080284948Abstract: It is the object of the present invention to provide a polarizing element capable of increasing a contrast ratio in an oblique direction and reducing a color shift in an oblique direction of a liquid crystal display apparatus. A polarizing element according to the present invention includes a polarizer, a negative C plate, a positive A plate, and a positive C plate each arranged on one side of the polarizer. The positive A plate is arranged between the polarizer and the positive C plate such that a slow axis of the positive A plate is substantially perpendicular to an absorption axis of the polarizer. The positive C plate has RthPC[590] of ?60 nm or less.Type: ApplicationFiled: February 15, 2006Publication date: November 20, 2008Applicant: Nitto Denko CorporationInventors: Naoki Koishi, Shuuji Yano, Kenji Yoda, Kentarou Kobayashi, Masatoshi Tomonaga, Naoto Ooe