公开(公告)号：US10754065B2

公开(公告)日：2020-08-25

申请号：US15294055

申请日：2016-10-14

Applicant: NITTO DENKO CORPORATION ,  Mitsubishi Chemical Corporation

Inventor： Shingo Namiki ,  Yuuichi Hirami ,  Hisatoshi Uehara ,  Hiroyuki Hayashi ,  Takashi Shimizu ,  Hiroshi Sumimura ,  Nao Murakami

IPC: G02B1/08 ,  G02B5/30 ,  H01L51/52 ,  C08G63/64

Abstract: An object of the present invention is to provide a retardation film excellent in various properties such as optical properties, heat resistance, mechanical properties, and reliability. The present invention relates to a retardation film containing a thermoplastic resin and composed of a single layer, in which the retardation film has a value of wavelength dispersion that is a ratio of retardations at a wavelength of 450 nm and at a wavelength of 550 nm being 0.75 or more and 0.92 or less; a birefringence at a wavelength of 550 nm and the wavelength dispersion satisfy a relationship of Δn≥0.0140×(R450/R550)−0.0082; and a photoelastic coefficient is 25×10−12 Pa−1 or less.

公开(公告)号：US09950461B2

公开(公告)日：2018-04-24

申请号：US14892808

申请日：2014-03-12

Applicant: NITTO DENKO CORPORATION

Inventor： Takashi Shimizu ,  Satoshi Hirata ,  Seiji Kondo ,  Nao Murakami

IPC: B29C55/04 ,  G02B5/30 ,  B29D11/00 ,  B29C55/16 ,  G02B1/04 ,  B29K29/00 ,  B29K69/00 ,  B29K105/00

CPC classification number: B29C55/045 ,  B29C55/04 ,  B29C55/16 ,  B29C55/165 ,  B29D11/00644 ,  B29K2029/14 ,  B29K2069/00 ,  B29K2105/256 ,  B29K2995/0034 ,  G02B1/04 ,  G02B5/3041 ,  G02B5/3083

Abstract: Provided is a method capable of producing a retardation film suppressed in biaxiality, having a small Nz coefficient, and having a slow axis in an oblique direction with high production efficiency. The production method for a retardation film of the present invention includes: holding left and right side edge portions of a film to be stretched with left and right variable pitch-type clips configured to have clip pitches changing in a longitudinal direction, respectively; preheating the film; reducing, under a state in which a position at which the clip pitch of the clips on one side out of the left and right clips starts to reduce and a position at which the clip pitch of the clips on another side starts to reduce are set to different positions in the longitudinal direction, the clip pitch of each of the clips to a predetermined pitch to subject the film to oblique stretching; and releasing the clips holding the film.

公开(公告)号：US09796146B2

公开(公告)日：2017-10-24

申请号：US14780673

申请日：2014-03-12

Applicant: NITTO DENKO CORPORATION

Inventor： Takashi Shimizu ,  Satoshi Hirata ,  Seiji Kondo ,  Nao Murakami

IPC: B29D11/00 ,  B29C55/04 ,  B29C55/16 ,  G02B5/30 ,  B29K69/00 ,  B29L11/00 ,  B29C55/20

CPC classification number: B29D11/00644 ,  B29C55/045 ,  B29C55/16 ,  B29C55/20 ,  B29K2069/00 ,  B29L2011/0066 ,  G02B5/30 ,  G02B5/3083

Abstract: The present invention provides a method capable of producing a retardation film having an elongated shape, having high uniaxiality and a high in-plane alignment property, and having a slow axis in an oblique direction with high production efficiency. The production method for a retardation film of the present invention includes: holding left and right end portions of a film with left and right variable pitch-type clips configured to have clip pitches changing in a longitudinal direction, respectively; preheating the film; increasing the clip pitch of the clips on one side and reducing the clip pitch of the clips on another side, while extending a distance between the left and right clips, to obliquely stretch the film; maintaining or reducing the clip pitch of the clips on the one side and increasing the clip pitch of the clips on the another side so that the clip pitches of the left and right clips are equal to each other, while extending the distance between the left and right clips, to obliquely stretch the film; and releasing the film from being held with the clips.

公开(公告)号：US10732323B2

公开(公告)日：2020-08-04

申请号：US15294040

申请日：2016-10-14

Applicant: NITTO DENKO CORPORATION ,  Mitsubishi Chemical Corporation

Inventor： Shingo Namiki ,  Yuuichi Hirami ,  Hisatoshi Uehara ,  Hiroyuki Hayashi ,  Takashi Shimizu ,  Hiroshi Sumimura ,  Nao Murakami

IPC: G02B1/08 ,  G02B5/30 ,  C08G63/64 ,  C08J5/18 ,  H01L51/52

Abstract: The retardation film of the present invention contains a resin having positive refractive index anisotropy and containing at least one bonding group of a carbonate bond and an ester bond and one or more structural units selected from the group consisting of a structural unit represented by the general formula (1) and a structural unit represented by the general formula (2), in which the value of wavelength dispersion (R450/R550) as a ratio of retardation R450 at a wavelength of 450 nm to retardation R550 at a wavelength of 550 nm is more than 0.5 and less than 1.0: (in formula (1) and formula (2), definitions of R1 to R9 are the same as in the description).

公开(公告)号：US20190079231A1

公开(公告)日：2019-03-14

申请号：US16072771

申请日：2017-01-31

Applicant: MITSUBISHI CHEMICAL CORPORATION ,  NITTO DENKO CORPORATION

Inventor： Hiroshi Sumimura ,  Takashi Shimizu ,  Shingo Namiki ,  Yuuichi Hirami

IPC: G02B5/30 ,  G02F1/1333 ,  C08G63/64

Abstract: There is provided an optical laminate that has a conductive layer directly formed on a retardation layer, is extremely thin and has an excellent antireflection function, and further, can realize excellent display characteristics even when it is applied to a bent portion of an image display apparatus. An optical laminate according to an embodiment of the present invention includes: a polarizer; a retardation layer; and a conductive layer, which is directly formed on the retardation layer. The retardation layer has an in-plane retardation Re(550) being from 100 nm to 180 nm and satisfying a relationship of Re(450)

公开(公告)号：US10086556B2

公开(公告)日：2018-10-02

申请号：US15120435

申请日：2015-04-07

Applicant: NITTO DENKO CORPORATION

Inventor： Takashi Shimizu ,  Makoto Nakaichi ,  Ryuuichi Kira ,  Satoshi Hirata

IPC: B29C55/04 ,  B29B13/02 ,  G02F1/1335 ,  G02B5/30 ,  G02F1/13363 ,  B29C55/20 ,  B29D11/00 ,  C08J5/18 ,  B29C55/16 ,  B29L11/00

Abstract: Provided is a method capable of producing a retardation film having an elongated shape and having a slow axis in an oblique direction with high production efficiency while precisely controlling the direction of the slow axis and the variation of the direction. The method of producing a retardation film of the present invention includes: holding the left and right end portions of a film with left and right variable pitch-type clips configured to have clip pitches changing in a longitudinal direction, respectively; preheating the film; obliquely stretching the film; and releasing the clips holding the film. The oblique stretching includes making the change ratio of the clip pitch of the clips on one side in the traveling direction thereof and the change ratio of the clip pitch of the clips on the other side in the traveling direction thereof different from each other, and/or making the position at which the clip pitch of the clips on the one side in the traveling direction starts to change and the position at which the clip pitch of the clips on the other side in the traveling direction starts to change different from each other, while extending a distance between the left and right clips. In the present invention, the moving speeds of the clips are braked immediately before the holding step and/or during a time period from the holding step to the oblique stretching step.

公开(公告)号：US09627655B2

公开(公告)日：2017-04-18

申请号：US14417243

申请日：2013-07-04

Applicant: NITTO DENKO CORPORATION

Inventor： Hironori Yaginuma ,  Kentarou Takeda ,  Takashi Shimizu ,  Kazuki Uwada ,  Nao Murakami

IPC: H01L51/52 ,  H01L51/56 ,  H01L27/32 ,  G02B5/30 ,  H04M1/02

CPC classification number: H01L51/5293 ,  G02B5/3033 ,  G02B5/3083 ,  H01L27/32 ,  H01L27/3276 ,  H01L51/5281 ,  H01L51/56 ,  H01L2251/55 ,  H04M1/0266

Abstract: 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 θ1 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)

公开(公告)号：US09459389B2

公开(公告)日：2016-10-04

申请号：US14405301

申请日：2013-06-24

Applicant: NITTO DENKO CORPORATION

Inventor： Takashi Shimizu ,  Nao Murakami ,  Kazuki Uwada ,  Tadashi Kojima ,  Hironori Yaginuma

IPC: G02B5/30 ,  H01L51/52

CPC classification number: G02B5/3041 ,  G02B5/3025 ,  G02B5/3033 ,  G02B5/3083 ,  H01L51/5281

Abstract: 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)

Abstract translation: 提供了实现优异的反射色调的偏振片。 根据本发明实施例的偏光板用于有机EL面板中，并且包括偏振器和延迟膜。 延迟膜的面内延迟满足Re（450）

公开(公告)号：US09164213B2

公开(公告)日：2015-10-20

申请号：US14390907

申请日：2013-06-18

Applicant: NITTO DENKO CORPORATION

Inventor： Hironori Yaginuma ,  Takashi Shimizu ,  Kazuki Uwada ,  Nao Murakami ,  Tadashi Kojima ,  Kentarou Takeda

IPC: G02B5/30 ,  H01L51/52 ,  C08G64/06

CPC classification number: G02B5/3083 ,  C08G64/06 ,  G02B1/04 ,  G02B5/3016 ,  G02B5/3025 ,  H01L51/5281 ,  H01L51/5293 ,  C08L69/00

Abstract: 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) 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.

Abstract translation: 提供了具有优异的视角特性并抑制显示特性变化的偏振片。 本发明的偏振片用于有机EL面板，具有偏振片（10），第一延迟层（30）和第二延迟层（40）。 第一延迟层（30）表示nx>ny≥nz的折射率特性，满足Re（450）nx≥ny的折射率特性。 第一延迟层（30）和第二延迟层（40）的层叠体的Re（550）为120nm〜160nm，Rth（550）为40nm〜100nm。

公开(公告)号：US20150168624A1

公开(公告)日：2015-06-18

申请号：US14390907

申请日：2013-06-18

Applicant: NITTO DENKO CORPORATION

Inventor： Hironori Yaginuma ,  Takashi Shimizu ,  Kazuki Uwada ,  Nao Murakami ,  Tadashi Kojima ,  Kentarou Takeda

IPC: G02B5/30 ,  C08G64/06 ,  H01L51/52

CPC classification number: G02B5/3083 ,  C08G64/06 ,  G02B1/04 ,  G02B5/3016 ,  G02B5/3025 ,  H01L51/5281 ,  H01L51/5293 ,  C08L69/00

Abstract: 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) 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.

Abstract translation: 提供了具有优异的视角特性并抑制显示特性变化的偏振片。 本发明的偏振片用于有机EL面板，具有偏振片（10），第一延迟层（30）和第二延迟层（40）。 第一延迟层（30）表示nx>ny≥nz的折射率特性，满足Re（450）nx≥ny的折射率特性。 第一延迟层（30）和第二延迟层（40）的层叠体的Re（550）为120nm〜160nm，Rth（550）为40nm〜100nm。