Patents by Inventor Hironori Yaginuma
Hironori Yaginuma 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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Publication number: 20230128331Abstract: A peeking prevention system has: a display device having, on a front surface of a display screen, a first polarization layer that has a first absorption axis parallel to a first direction; and a room partition that partitions a space in which a display is provided by the display device from a surrounding space, the room partition having a translucent part that makes it possible to see into the space, the translucent part including a transparent substrate and a second polarization layer that is positioned on the space side of the transparent substrate and that has a second absorption axis parallel to a second direction, wherein: the system furthermore has a phase contrast film that is positioned on the front surface of the first polarization layer; the phase contrast layer has a delay axis parallel to a third direction; and transparency is reduced when the display screen is viewed.Type: ApplicationFiled: March 26, 2021Publication date: April 27, 2023Applicant: NITTO DENKO CORPORATIONInventors: Hiroyuki Takemoto, Hironori Yaginuma, Masahiro Yaegashi
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Publication number: 20210260851Abstract: There is provided an optical laminate that can suppress the deterioration of the optical characteristics of a retardation layer. An optical laminate according to an embodiment of the present invention includes: a UV-absorbing adhesion layer; a protective layer; a polarizer; and a retardation layer. The retardation layer contains a liquid crystal compound. The UV-absorbing adhesion layer and the polarizer are arranged on a viewer side with respect to the retardation layer, and the UV-absorbing adhesion layer contains a base polymer, a UV absorber, and a dye compound whose absorption spectrum has a maximum absorption wavelength present in a wavelength region of from 380 nm to 430 nm.Type: ApplicationFiled: May 20, 2019Publication date: August 26, 2021Applicant: NITTO DENKO CORPORATIONInventors: Hiroshi Tomohisa, Hirofumi Katami, Hironori Yaginuma
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Patent number: 11018326Abstract: There is provided a polarizing plate with optical compensation layers that is excellent in antireflection characteristic: in an oblique direction while maintaining an excellent antireflection characteristic in a front direction, and that has a neutral hue in the oblique direction. A polarizing plate with optical compensation layers according to the present invention is used for an organic EL panel The polarizing plate with optical compensation layers according to an embodiment of the present invention includes in the following order: a polarizer; a first optical compensation layer; and a second optical compensation layer. The first optical compensation layer shows a refractive index characteristic of nx>nz>ny and has an Re (550) of from 230 nm to 310 nm. The second optical compensation layer shows a refractive index characteristic of nx>nz>ny and satisfies a relationship of Re (450)<Re (550).Type: GrantFiled: March 6, 2017Date of Patent: May 25, 2021Assignee: NITTO DENKO CORPORATIONInventors: Toshiyuki Iida, Hironori Yaginuma
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Patent number: 10989853Abstract: There is provided a polarizing plate with optical compensation layers having the following features: the polarizing plate is excellent in antireflection characteristic in an oblique direction while maintaining an excellent antireflection characteristic in a front direction; the polarizing plate can achieve such excellent antireflection characteristics over a wide wavelength band; and the polarizing plate has a neutral hue in the oblique direction. A polarizing plate with optical compensation layers according to the present invention is used for an organic EL panel. The polarizing plate with optical compensation layers includes: a polarizer; a first optical compensation layer; a second optical compensation layer; and a third optical compensation layer. Each of the first optical compensation layer, the second optical compensation layer, and the third optical compensation layer shows a refractive index characteristic of nx>nz>ny.Type: GrantFiled: February 10, 2017Date of Patent: April 27, 2021Assignee: NITTO DENKO CORPORATIONInventors: Toshiyuki Iida, Hironori Yaginuma
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Publication number: 20210109271Abstract: An image display apparatus is disclosed including a display cell, a first retardation layer, a second retardation layer, and a polarizer. Re(550) of a laminate of the first retardation layer and the second retardation layer is from 120 nm to 142 nm, or from 151 nm to 160 nm, and when an initial value of a front reflection hue value “a” in a non-lit state is represented by a0, a value of “a” after the image display apparatus is left in an environment set to 65° C. and an RH of 90% for 250 hours is represented by a1, an initial value of a front reflection hue value “b” is represented by b0, and a value of “b” after the image display apparatus is left in an environment set to 65° C. and an RH of 90% for 250 hours is represented by b1, a0×a1>0 and b0×b1>0 are satisfied.Type: ApplicationFiled: January 4, 2018Publication date: April 15, 2021Applicant: NITTO DENKO CORPORATIONInventors: Hiroshi Tomohisa, Hironori Yaginuma, Ryoji Kinoshita
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Patent number: 10914881Abstract: There is provided a polarizing plate with optical compensation layers having the following features: the polarizing plate is excellent in antireflection characteristic in an oblique direction while maintaining an excellent antireflection characteristic in a front direction; the polarizing plate can achieve such excellent antireflection characteristics over a wide wavelength band; and the polarizing plate has a neutral hue in the oblique direction. A polarizing plate with optical compensation layers according to the present invention is used for an organic EL panel. The polarizing plate with optical compensation layers includes: a polarizer; a first optical compensation layer; a second optical compensation layer; a third optical compensation layer; and a fourth optical compensation layer. Each of the first optical compensation layer, the second optical compensation layer, the third optical compensation layer, and the fourth optical compensation layer shows a refractive index characteristic of nx>nz>ny.Type: GrantFiled: February 8, 2017Date of Patent: February 9, 2021Assignee: NITTO DENKO CORPORATIONInventors: Toshiyuki Iida, Hironori Yaginuma
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Patent number: 10634836Abstract: There is provided a circularly polarizing plate for an organic EL display apparatus that is excellent in productivity, is prevented from warping, and can achieve an excellent tint. An elongated circularly polarizing plate for an organic EL display apparatus according to an embodiment of the present invention includes in the following order: an elongated polarizer having an absorption axis in a longitudinal direction thereof; an elongated first retardation layer functioning as a ?/2 plate; and an elongated second retardation layer functioning as a ?/4 plate. An angle formed between the absorption axis of the elongated polarizer and a slow axis of the elongated first retardation layer is front 15° to 30°; and the absorption axis of the elongated polarizer and a slow axis of the elongated second retardation layer are substantially perpendicular to each other.Type: GrantFiled: April 28, 2015Date of Patent: April 28, 2020Assignee: NITTO DENKO CORPORATIONInventors: Kentarou Takeda, Hironori Yaginuma, Kazuki Uwada, Tadashi Kojima, Nao Murakami
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Publication number: 20190331838Abstract: There is provided an optical laminate that can improve viewability by suppressing a hue change in accordance with the angle of polarized sunglasses. An optical laminate of the present invention includes: a first retardation layer; a second retardation layer; a polarizer; and a third retardation layer. The first retardation layer, the second retardation layer, the polarizer, and the third retardation layer is laminated from a viewer side in the stated order.Type: ApplicationFiled: November 29, 2017Publication date: October 31, 2019Applicant: NITTO DENKO CORPORATIONInventors: Yoshimi Konno, Hironori Yaginuma, Akinori Izaki, Yoshitsugu Kitamura
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Publication number: 20190101678Abstract: There is provided a polarizing plate with optical compensation layers having the following features: the polarising plate is excellent in antireflection characteristic in an oblique direction while maintaining an excellent antireflection characteristic in a front direction; the polarizing plate can achieve such excellent antireflection characteristics over a wide wavelength band; and the polarizing plate has a neutral hue in the oblique direction. A polarizing plate with optical compensation layers according to the present invention is used for an organic EL panel. The polarizing plate with optical compensation layers includes: a polarizer; a first optical compensation layer; a second optical compensation layer; and a third optical compensation layer. Each of the first optical compensation layer, the second optical compensation layer, and the third optical compensation layer shows a refractive index characteristic of nx>nz>ny.Type: ApplicationFiled: February 10, 2017Publication date: April 4, 2019Applicant: NITTO DENKO CORPORATIONInventors: Toshiyuki Iida, Hironori Yaginuma
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Publication number: 20190103589Abstract: There is provided a polarizing plate with optical compensation layers that is excellent in antireflection characteristic: in an oblique direction while maintaining an excellent antireflection characteristic in a front direction, and that has a neutral hue in the oblique direction. A polarizing plate with optical compensation layers according to the present invention is used for an organic EL panel The polarizing plate with optical compensation layers according to an embodiment of the present invention includes in the following order: a polarizer; a first optical compensation layer; and a second optical compensation layer. The first optical compensation layer shows a refractive index characteristic of nx>nz>ny and has an Re (550) of from 230 nm to 310 nm. The second optical compensation layer shows a refractive index characteristic of nx>nz>ny and satisfies a relationship of Re (450)<Re (550).Type: ApplicationFiled: March 6, 2017Publication date: April 4, 2019Applicant: NITTO DENKO CORPORATIONInventors: Toshiyuki Iida, Hironori Yaginuma
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Publication number: 20190101677Abstract: There is provided a polarizing plate with optical compensation layers having the following features: the polarizing plate is excellent in antireflection characteristic in an oblique direction while maintaining an excellent antireflection characteristic in a front direction; the polarizing plate can achieve such excellent antireflection characteristics over a wide wavelength band; and the polarizing plate has a neutral hue in the oblique direction. A polarizing plate with optical compensation layers according to the present invention is used for an organic EL panel. The polarizing plate with optical compensation layers includes: a polarizer; a first optical compensation layer; a second optical compensation layer; a third optical compensation layer; and a fourth optical compensation layer. Each of the first optical compensation layer, the second optical compensation layer, the third optical compensation layer, and the fourth optical compensation layer shows a refractive index characteristic of nx>nz>ny.Type: ApplicationFiled: February 8, 2017Publication date: April 4, 2019Applicant: NITTO DENKO CORPORATIONInventors: Toshiyuki Iida, Hironori Yaginuma
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Patent number: 10036840Abstract: There is provided a circularly polarizing plate capable of realizing a bendable display apparatus in which an excellent reflection hue is obtained and a color change due to bending is suppressed. A circularly polarizing plate according to the present invention is used in a bendable display apparatus. The circularly polarizing plate includes: a polarizer; and a retardation film arranged on one side of the polarizer. In-plane retardations of the retardation film satisfy a relationship of Re(450)<Re(550)<Re(650), and a slow axis direction of the retardation film is adjusted so as to form an angle of from 20° to 70° with respect to a bending direction of the display apparatus.Type: GrantFiled: January 29, 2014Date of Patent: July 31, 2018Assignee: NITTO DENKO CORPORATIONInventors: Kentarou Takeda, Hironori Yaginuma, Hiroshi Sumimura, Nao Murakami
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Patent number: 9627655Abstract: There is provided a display apparatus that can suppress the occurrence of a crack in a circularly polarizing plate in its manufacturing process without reducing designability and mass productivity. A display apparatus according to an embodiment of the present invention includes: a display element; and a circularly polarizing plate placed on a viewer side of the display element. The circularly polarizing plate includes a polarizer and a retardation film. In-plane retardations of the retardation film satisfy a relationship represented by the below-indicated expression (1); and an angle ?1 formed between a slow axis of the retardation film and a direction in which a wiring crimping portion provided along at least one side of a peripheral edge portion of the display element extends satisfies a relationship represented by the below-indicated expression (2): Re(450)<Re(550)??(1) ?1?70°??(2) where Re(450) and Re(550) represent in-plane retardations measured at 23° C.Type: GrantFiled: July 4, 2013Date of Patent: April 18, 2017Assignee: NITTO DENKO CORPORATIONInventors: Hironori Yaginuma, Kentarou Takeda, Takashi Shimizu, Kazuki Uwada, Nao Murakami
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Publication number: 20170052300Abstract: There is provided a circularly polarizing plate for an organic EL display apparatus that is excellent in productivity, is prevented from warping, and can achieve an excellent tint. An elongated circularly polarizing plate for an organic EL display apparatus according to an embodiment of the present invention includes in the following order: an elongated polarizer having an absorption axis in a longitudinal direction thereof; an elongated first retardation layer functioning as a ?/2 plate; and an elongated second retardation layer functioning as a ?/4 plate. An angle formed between the absorption axis of the elongated polarizer and a slow axis of the elongated first retardation layer is front 15° to 30°; and the absorption axis of the elongated polarizer and a slow axis of the elongated second retardation layer are substantially perpendicular to each other.Type: ApplicationFiled: April 28, 2015Publication date: February 23, 2017Applicant: NITTO DENKO CORPORATIONInventors: Kentarou Takeda, Hironori Yaginuma, Kazuki Uwada, Tadashi Kojima, Nao Murakami
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Patent number: 9459389Abstract: There is provided a polarizing plate that achieves an excellent reflection hue. A polarizing plate according to an embodiment of the present invention is used in an organic EL panel, and includes a polarizer and a retardation film. In-plane retardations of the retardation film satisfy a relationship of Re(450)<Re(550); and an angle ? formed between an absorption axis of the polarizer and a slow axis of the retardation film satisfies a relationship of 38°???44° or of 46°???52°.Type: GrantFiled: June 24, 2013Date of Patent: October 4, 2016Assignee: NITTO DENKO CORPORATIONInventors: Takashi Shimizu, Nao Murakami, Kazuki Uwada, Tadashi Kojima, Hironori Yaginuma
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Publication number: 20150369981Abstract: There is provided a circularly polarizing plate capable of realizing a bendable display apparatus in which an excellent reflection hue is obtained and a color change due to bending is suppressed. A circularly polarizing plate according to the present invention is used in a bendable display apparatus. The circularly polarizing plate includes: a polarizer; and a retardation film arranged on one side of the polarizer. In-plane retardations of the retardation film satisfy a relationship of Re(450)<Re(550)<Re(650), and a slow axis direction of the retardation film is adjusted so as to form an angle of from 20° to 70° with respect to a bending direction of the display apparatus.Type: ApplicationFiled: January 29, 2014Publication date: December 24, 2015Applicant: NITTO DENKO CORPORATIONInventors: Kentarou Takeda, Hironori Yaginuma, Hiroshi Sumimura, Nao Murakami
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Patent number: 9164213Abstract: Provided is a polarizing plate that has an excellent viewing angle characteristic and suppresses changes in display characteristics. A polarizing plate of the present invention is used in an organic EL panel, and includes a polarizer (10), a first retardation layer (30), and a second retardation layer (40). The first retardation layer (30) shows a refractive index characteristic of nx>ny?nz, satisfies a relationship of Re(450)<Re(550), and has a water absorption rate of 3% or less. The second retardation layer (40) shows a refractive index characteristic of nz>nx?ny. A laminate of the first retardation layer (30) and the second retardation layer (40) has an Re(550) of from 120 nm to 160 nm and an Rth(550) of from 40 nm to 100 nm.Type: GrantFiled: June 18, 2013Date of Patent: October 20, 2015Assignee: NITTO DENKO CORPORATIONInventors: Hironori Yaginuma, Takashi Shimizu, Kazuki Uwada, Nao Murakami, Tadashi Kojima, Kentarou Takeda
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Publication number: 20150249231Abstract: There is provided a display apparatus that can suppress the occurrence of a crack in a circularly polarizing plate in its manufacturing process without reducing designability and mass productivity. A display apparatus according to an embodiment of the present invention includes: a display element; and a circularly polarizing plate placed on a viewer side of the display element. The circularly polarizing plate includes a polarizer and a retardation film. In-plane retardations of the retardation film satisfy a relationship represented by the below-indicated expression (1); and an angle ?1 formed between a slow axis of the retardation film and a direction in which a wiring crimping portion provided along at least one side of a peripheral edge portion of the display element extends satisfies a relationship represented by the below-indicated expression (2): Re(450)<Re(550)??(1) ?1?70°??(2) where Re(450) and Re(550) represent in-plane retardations measured at 23° C.Type: ApplicationFiled: July 4, 2013Publication date: September 3, 2015Applicant: NITTO DENKO CORPORATIONInventors: Hironori Yaginuma, Kentarou Takeda, Takashi Shimizu, Kazuki Uwada, Nao Murakami
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Publication number: 20150168624Abstract: Provided is a polarizing plate that has an excellent viewing angle characteristic and suppresses changes in display characteristics. A polarizing plate of the present invention is used in an organic EL panel, and includes a polarizer (10), a first retardation layer (30), and a second retardation layer (40). The first retardation layer (30) shows a refractive index characteristic of nx>ny?nz, satisfies a relationship of Re(450)<Re(550), and has a water absorption rate of 3% or less. The second retardation layer (40) shows a refractive index characteristic of nz>nx?ny. A laminate of the first retardation layer (30) and the second retardation layer (40) has an Re(550) of from 120 nm to 160 nm and an Rth(550) of from 40 nm to 100 nm.Type: ApplicationFiled: June 18, 2013Publication date: June 18, 2015Applicant: NITTO DENKO CORPORATIONInventors: Hironori Yaginuma, Takashi Shimizu, Kazuki Uwada, Nao Murakami, Tadashi Kojima, Kentarou Takeda
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Publication number: 20150116826Abstract: There is provided a polarizing plate that achieves an excellent reflection hue. A polarizing plate according to an embodiment of the present invention is used in an organic EL panel, and includes a polarizer and a retardation film. In-plane retardations of the retardation film satisfy a relationship of Re(450)<Re(550); and an angle ? formed between an absorption axis of the polarizer and a slow axis of the retardation film satisfies a relationship of 38°???44° or of 46°???52°.Type: ApplicationFiled: June 24, 2013Publication date: April 30, 2015Applicant: NITTO DENKO CORPORATIONInventors: Takashi Shimizu, Nao Murakami, Kazuki Uwada, Tadashi Kojima, Hironori Yaginuma