公开(公告)号：US11982896B2

公开(公告)日：2024-05-14

申请号：US18106913

申请日：2023-02-07

Applicant: SHARP KABUSHIKI KAISHA

Inventor： Akira Sakai ,  Yuichi Kawahira ,  Masahiro Hasegawa ,  Kiyoshi Minoura

IPC: G02F1/1335 ,  G02B5/30 ,  G02F1/13363

CPC classification number: G02F1/133528 ,  G02B5/3083 ,  G02F1/133504 ,  G02F1/133531 ,  G02F1/13363

Abstract: Provided is a liquid crystal display device and a polarizing plate capable of improving the contrast ratio in the front direction. The polarizing plate includes a pair of polarizers including a first polarizer and a second polarizer whose transmission axes are parallel to each other; a retarder between the paired polarizers; and a diffusion layer in at least one of a region between the paired polarizers or a region on a side without the retarder of the first polarizer.

公开(公告)号：US11307337B2

公开(公告)日：2022-04-19

申请号：US16499238

申请日：2018-03-23

Applicant: SHARP KABUSHIKI KAISHA

Inventor： Akira Sakai ,  Masahiro Hasegawa ,  Atsushi Ban ,  Koji Murata ,  Yuichi Kawahira ,  Kiyoshi Minoura ,  Takako Koide ,  Kozo Nakamura

IPC: G02B5/30 ,  G02F1/1335 ,  G06F3/041 ,  H01L27/32 ,  H01L51/52

Abstract: The present invention provides: (I) a display device including a display panel, a retardation layer, and a polarizer which are stacked in the stated order from a back surface side to a viewing surface side and integrated without an adhesive layer; and (II) a method for producing a display device including: forming a first alignment film on a display panel, applying a solution containing first polymerizable liquid crystal to the first alignment film, and curing the first polymerizable liquid crystal to produce a retardation layer; and forming a second alignment film on the retardation layer, applying a solution containing second polymerizable liquid crystal and a dichroic material to the second alignment film, and curing the second polymerizable liquid crystal to produce a polarizer.

公开(公告)号：US11131891B2

公开(公告)日：2021-09-28

申请号：US16630115

申请日：2018-07-06

Applicant: SHARP KABUSHIKI KAISHA

Inventor： Akira Sakai ,  Yuichi Kawahira ,  Koji Murata ,  Masahiro Hasegawa ,  Takako Koide ,  Kozo Nakamura ,  Kiyoshi Minoura

IPC: G02F1/1343 ,  G02F1/13363 ,  G02F1/1335 ,  G02F1/1337

Abstract: The present invention provides a liquid crystal display device of a transverse electric field mode that may inhibit internal reflection and realize proper black display to which coloring does not occur. The present invention provides a liquid crystal display device including a first linear polarizer, a first λ/4 retardation layer, a first substrate, a second λ/4 retardation layer configured with a different material from the first λ/4 retardation layer, a liquid crystal layer that contains liquid crystals which are horizontally aligned in a case where no voltage is applied, plural electrode pairs that generate a transverse electric field in the liquid crystal layer by a voltage being applied, a second substrate, a second linear polarizer, and a backlight. In a case where a color of light emitted from the backlight is expressed by using chromaticity coordinates (x, y) of an XYZ color system, both of x and y are 0.32 or greater. The plural electrode pairs include a red electrode pair arranged in a red sub-pixel, a green electrode pair arranged in a green sub-pixel, and a blue electrode pair arranged in a blue sub-pixel. A white display applied voltage of the blue electrode pair is different from the white display applied voltage of the red electrode pair and the white display applied voltage of the green electrode pair.

公开(公告)号：US11099434B2

公开(公告)日：2021-08-24

申请号：US16780559

申请日：2020-02-03

Applicant: SHARP KABUSHIKI KAISHA

Inventor： Koji Murata ,  Kohzoh Nakamura ,  Kiyoshi Minoura ,  Akira Sakai ,  Yuichi Kawahira

IPC: G02F1/13363 ,  G02F1/1337 ,  G02F1/139 ,  G02F1/1335

Abstract: A liquid crystal display panel performs displaying in the normally white mode. A first and a second polarizer are disposed so that the transmission axes thereof are perpendicular to each other. A liquid crystal layer is in a twisted alignment state in the absence of an applied voltage. A first substrate has a first electrode having a plurality of rectangular openings extending in parallel to each other, and a second electrode facing the first electrode with a dielectric layer interposed therebetween. The openings each independently have a width S of more than 0.6 μm and not more than 1.4 μm, and each pair of adjacent openings independently has a distance L therebetween of not less than 0.3 μm and not more than 0.7 μm. A first and a second horizontal alignment film each have an azimuthal anchoring energy of not more than 1×10−4J/m2.

公开(公告)号：US10725336B2

公开(公告)日：2020-07-28

申请号：US16302632

申请日：2017-05-16

Applicant: SHARP KABUSHIKI KAISHA

Inventor： Yuichi Kawahira ,  Akira Sakai ,  Kozo Nakamura ,  Masahiro Hasegawa ,  Takako Koide ,  Koji Murata ,  Kiyoshi Minoura

IPC: G02F1/1333 ,  G02F1/1335 ,  G02F1/13363 ,  G02F1/1339 ,  G02B5/30 ,  G02F1/1337 ,  G02F1/1343

Abstract: The liquid crystal display panel includes: a first polarizing plate; a first λ/4 plate; a first substrate; a second λ/4 plate; a liquid crystal layer; a second substrate; and a second polarizing plate, wherein the first substrate includes a black matrix but no photo spacer, the second substrate includes a photo spacer overlapping with the black matrix, liquid crystal molecules in the liquid crystal layer homogeneously align with no voltage application, the second λ/4 plate covers no side surface of the photo spacer, and the in-plane slow axis of the first λ/4 plate forms an angle of 45° with the transmission axis of the first polarizing plate and is orthogonal to the in-plane slow axis of the second λ/4 plate.

公开(公告)号：US10678087B2

公开(公告)日：2020-06-09

申请号：US16486726

申请日：2018-02-14

Applicant: SHARP KABUSHIKI KAISHA

Inventor： Akira Sakai ,  Yuichi Kawahira ,  Koji Murata ,  Masahiro Hasegawa ,  Takako Koide ,  Kozo Nakamura ,  Kiyoshi Minoura

IPC: G02F1/1335 ,  G02F1/13363 ,  G02F1/1339

Abstract: A liquid crystal display panel includes a first λ/4 retardation layer, a first substrate, a color filter layer, a liquid crystal layer containing horizontally aligned liquid crystals, and a second λ/4 retardation layer that is formed from a different material from the first λ/4 retardation layer between the first substrate and the color filter layer or between the color filter layer and the liquid crystal layer. The second λ/4 retardation layer has a smaller thickness in a region overlapping the blue color filter than in a region overlapping the green color filter. The first λ/4 retardation layer provides a retardation Rout(λ) to light having a wavelength of λ nm. The second λ/4 retardation layer provides a retardation Rin(λ). The retardation Rout(λ) and the retardation Rin(λ) satisfy the following formula (1) in the region overlapping the blue color filter. −1.0 nm

公开(公告)号：US10670911B2

公开(公告)日：2020-06-02

申请号：US16303016

申请日：2017-05-16

Applicant: SHARP KABUSHIKI KAISHA

Inventor： Yuichi Kawahira ,  Akira Sakai ,  Kozo Nakamura ,  Masahiro Hasegawa ,  Takako Koide ,  Koji Murata ,  Kiyoshi Minoura

IPC: G02F1/1335 ,  G02F1/13363 ,  G02F1/1337 ,  G02F1/1339 ,  G02F1/1333 ,  G02B5/20 ,  G02B5/30

Abstract: The liquid crystal display panel includes: a first polarizing plate; a first λ/4 plate; a first substrate; a second λ/4 plate; a liquid crystal layer; a second substrate; and a second polarizing plate, wherein the first substrate includes a black matrix, and a photo spacer overlapping with the black matrix, d crystal molecules in the liquid crystal layer homogeneously align with no voltage application, the second λ/4 plate is made of a self-assembling photo alignment material containing a photo functional group capable of causing at least one chemical reaction selected from the group consisting of photodimerization, photoisomerization, and photo-Fries rearrangement, and covers a side surface of the photo spacer, and the in-plane stow axis of the first λ/4 plate forms an angle of 45° with the transmission axis of the first polarizing plate and is orthogonal to the in-plane slow axis of the second λ/4 plate.

公开(公告)号：US20200166800A1

公开(公告)日：2020-05-28

申请号：US16778108

申请日：2020-01-31

Applicant: Sharp Kabushiki Kaisha

Inventor： Nathan James Smith ,  Kiyoshi Minoura ,  Akira Sakai ,  Yuichi Kawahira

IPC: G02F1/1335 ,  H01L27/12 ,  G02F1/13357 ,  G02F1/1337 ,  G02F1/1362 ,  G02F1/135

Abstract: A display device in which ambient light reflections, for example, from IPS or FFS type displays are reduced by a circular polariser (e.g., linear polariser combined with external quarter waveplate) to make the light circular polarized, as it traverses the multiple reflective layers between the polariser and LC layer, and then an internal quarter waveplate converts the light back to linear polarisation before it enters the LC, so the display can operate as normal, while the circular polariser absorbs unwanted reflections of ambient light from within the display.

公开(公告)号：US20190278120A1

公开(公告)日：2019-09-12

申请号：US15918093

申请日：2018-03-12

Applicant: Sharp Kabushiki Kaisha

Inventor： Nathan James Smith ,  Andrew Acreman ,  Hywel Hopkin ,  Kiyoshi Minoura ,  Koji Murata ,  Yuichi Kawahira ,  Akira Sakai ,  Jiyun Yu

IPC: G02F1/13363 ,  G02F1/1335 ,  G02F1/1337 ,  G02F1/1339

Abstract: A liquid crystal device (LCD) is configured for minimizing unwanted internal ambient light reflections. The LCD includes a plurality of layers, the layers comprising from a viewing side: a first linear polariser; an external retarder that is made of a cyclic olefin polymer (COP) material or a cyclic olefin copolymer (COC) material; a colour filter substrate; a colour filter layer; an internal reactive mesogen (RM) retarder alignment layer; an internal reactive mesogen (RM) retarder; a liquid crystal (LC) layer; and a second linear polarizer. The external retarder and the internal RM retarder are configured such that the optical properties (for example light polarization control function) of the external retarder and the internal retarder are matched to negate each other for light passing through the external retarder and the internal RM retarder. The LCD simultaneously maintains high image quality in both high and low ambient lighting conditions.

公开(公告)号：US10180594B2

公开(公告)日：2019-01-15

申请号：US15306791

申请日：2015-04-21

Applicant: Sharp Kabushiki Kaisha

Inventor： Hiroyuki Hakoi ,  Masahiro Hasegawa ,  Akira Sakai ,  Kiyoshi Minoura

IPC: G02F1/1335 ,  G02B5/30 ,  G02B7/00 ,  G09F9/35

Abstract: The present invention provides a mirror display that can suppress warp of a half mirror plate with a reflective polarizer under heat to prevent distortion of a reflected image in a mirror mode. The mirror display of the present invention includes a half mirror plate that includes a first reflective polarizer and a first base material, a display device, and a warp-suppressing member that suppresses shrinking of the first reflective polarizer under heat. The first reflective polarizer and the first base material are integrated, and the display device is disposed on the back surface side of the half mirror plate.