Patents by Inventor Naoki Koishi
Naoki Koishi 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).
-
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
-
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
-
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
-
Patent number: 7588807Abstract: A retardation film which hardly causes shift or unevenness in retardation values and which has a refractive index profile of nx>nz>ny (that is, 0<Rth[590]/Re[590]<1) is provided. A retardation film according to an embodiment of the present invention comprises a stretched polymer film containing a styrene-based resin and a polycarbonate-based resin, which satisfies the following expressions (1) and (2): 100 nm?Re[590]?350 nm??(1) 0.2?Rth[590]/Re[590]?0.Type: GrantFiled: August 24, 2005Date of Patent: September 15, 2009Assignee: Nitto Denko CorporationInventors: Masaki Hayashi, Naoki Koishi, Masahiro Hata, Shuuji Yano
-
Patent number: 7463320Abstract: A liquid crystal panel according to an embodiment of the present invention includes: a liquid crystal cell; a first polarizer arranged on one side of the liquid crystal cell; a second polarizer arranged on another side of the liquid crystal cell; a negative biaxial optical element and a positive C plate arranged between the liquid crystal cell and the first polarizer; and an isotropic optical element arranged between the liquid crystal cell and the second polarizer. Here, the negative biaxial optical element is arranged between the first polarizer and the positive C plate.Type: GrantFiled: November 3, 2005Date of Patent: December 9, 2008Assignee: Nitto Denko CorporationInventors: Kentarou Kobayashi, Shuuji Yano, Naoki Koishi
-
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
-
Patent number: 7408603Abstract: A liquid crystal panel according to an embodiment of the present invention includes: a liquid crystal cell; a first polarizer arranged on one side of the liquid crystal cell; a second polarizer arranged on another side of the liquid crystal cell; a positive A plate and a positive C plate arranged between the liquid crystal cell and the first polarizer; and an isotropic optical element arranged between the liquid crystal cell and the second polarizer, wherein the positive A plate is arranged between the first polarizer and the positive C plate.Type: GrantFiled: December 2, 2005Date of Patent: August 5, 2008Assignee: Nitto Denko CorporationInventors: Mie Nakata, Shuuji Yano, Naoki Koishi, Kentarou Kobayashi
-
Patent number: 7361390Abstract: A liquid crystal panel having improved contrast ratio in an oblique direction and good display evenness without causing shift or unevenness in retardation values due to shrinkage stress of a polarizer or heat of backlight is provided. A liquid crystal panel according to an embodiment of the present invention includes: a liquid crystal cell; a polarizer arranged on both sides of the liquid crystal cell; a first optical element arranged between one polarizer and the liquid crystal cell; and a second optical element arranged between the other polarizer and the liquid crystal cell, wherein: the first optical element comprises a retardation film containing a norbornene-based resin and satisfying the following expressions (1) and (2); and the second optical element has substantially optical isotropy: 240 nm?Re[590]?350 nm??(1) 0.20?Rth[590]/Re[590]?0.80.Type: GrantFiled: September 19, 2005Date of Patent: April 22, 2008Assignee: Nitto Denko CorporationInventors: Kenji Yoda, Shuuji Yano, Naoki Koishi, Masaki Hayashi
-
Patent number: 7264852Abstract: A liquid crystal panel having improved contrast ratio in an oblique direction and good display evenness without causing shift or unevenness in retardation values due to shrinkage stress of a polarizer or heat of backlight is provided. A liquid crystal panel according to an embodiment of the present invention includes: a liquid crystal cell; a polarizer arranged on both sides of the liquid crystal cell; a first optical element arranged between one polarizer and the liquid crystal cell; and a second optical element arranged between the other polarizer and the liquid crystal cell, wherein: the first optical element comprises a retardation film containing a styrene-based resin and a polycarbonate-based resin and satisfying the following expressions (1) and (2); and the second optical element has substantially optical isotropy: 240 nm?Re[590]?350 nm??(1) 0.20?Rth[590]/Re[590]?0.80.Type: GrantFiled: October 19, 2005Date of Patent: September 4, 2007Assignee: Nitto Denko CorporationInventors: Naoki Koishi, Shuuji Yano, Kenji Yoda, Masaki Hayashi
-
Publication number: 20060246231Abstract: A liquid crystal panel having improved contrast ratio in an oblique direction and good display evenness without causing shift or unevenness in retardation values due to shrinkage stress of a polarizer or heat of backlight is provided. A liquid crystal panel according to an embodiment of the present invention includes: a liquid crystal cell; a polarizer arranged on both sides of the liquid crystal cell; a first optical element arranged between one polarizer and the liquid crystal cell; and a second optical element arranged between the other polarizer and the liquid crystal cell, wherein: the first optical element comprises a retardation film containing a styrene-based resin and a polycarbonate-based resin and satisfying the following expressions (1) and (2); and the second optical element has substantially optical isotropy: 240 nm?Re[590]?350 nm??(1) 0.20?Rth[590]/Re[590]?0.80??(2).Type: ApplicationFiled: October 19, 2005Publication date: November 2, 2006Applicant: NITTO DENKO CORPORATIONInventors: Naoki Koishi, Shuuji Yano, Kenji Yoda, Masaki Hayashi
-
Publication number: 20060119775Abstract: A liquid crystal panel according to an embodiment of the present invention includes: a liquid crystal cell; a first polarizer arranged on one side of the liquid crystal cell; a second polarizer arranged on another side of the liquid crystal cell; a positive A plate and a positive C plate arranged between the liquid crystal cell and the first polarizer; and an isotropic optical element arranged between the liquid crystal cell and the second polarizer, wherein the positive A plate is arranged between the first polarizer and the positive C plate.Type: ApplicationFiled: December 2, 2005Publication date: June 8, 2006Applicant: NITTO DENKO CORPORATIONInventors: Mie Nakata, Shuuji Yano, Naoki Koishi, Kentarou Kobayashi
-
Publication number: 20060114383Abstract: A liquid crystal panel according to an embodiment of the present invention includes: a liquid crystal cell; a first polarizer arranged on one side of the liquid crystal cell; a second polarizer arranged on another side of the liquid crystal cell; a negative biaxial optical element and a positive C plate arranged between the liquid crystal cell and the first polarizer; and an isotropic optical element arranged between the liquid crystal cell and the second polarizer. Here, the negative biaxial optical element is arranged between the first polarizer and the positive C plate.Type: ApplicationFiled: November 3, 2005Publication date: June 1, 2006Applicant: NITTO DENKO CORPORATIONInventors: Kentarou Kobayashi, Shuuji Yano, Naoki Koishi
-
Publication number: 20060066787Abstract: A liquid crystal panel having improved contrast ratio in an oblique direction and good display evenness without causing shift or unevenness in retardation values due to shrinkage stress of a polarizer or heat of backlight is provided. A liquid crystal panel according to an embodiment of the present invention includes: a liquid crystal cell; a polarizer arranged on both sides of the liquid crystal cell; a first optical element arranged between one polarizer and the liquid crystal cell; and a second optical element arranged between the other polarizer and the liquid crystal cell, wherein: the first optical element comprises a retardation film containing a norbornene-based resin and satisfying the following expressions (1) and (2); and the second optical element has substantially optical isotropy: 240nm?Re[590]?350nm??(1) 0.20?Rth[590]/Re[590]?0.80??(2).Type: ApplicationFiled: September 19, 2005Publication date: March 30, 2006Applicant: NITTO DENKO CORPORATIONInventors: Kenji Yoda, Shuuji Yano, Naoki Koishi, Masaki Hayashi
-
Publication number: 20060062934Abstract: A retardation film which hardly causes shift or unevenness in retardation values and which has a refractive index profile of nx>nz>ny (that is, 0<Rth[590]/Re[590]<1) is provided. A retardation film according to an embodiment of the present invention comprises a stretched polymer film containing a styrene-based resin and a polycarbonate-based resin, which satisfies the following expressions (1) and (2): 100 nm?Re[590]?350 nm ??(1) 0.2?Rth[590]/Re[590]?0.Type: ApplicationFiled: August 24, 2005Publication date: March 23, 2006Applicant: NITTO DENKO CORPORATIONInventors: Masaki Hayashi, Naoki Koishi, Masahiro Hata, Shuuji Yano