公开(公告)号：US20240103314A1

公开(公告)日：2024-03-28

申请号：US18239318

申请日：2023-08-29

Applicant: Sharp Display Technology Corporation

Inventor： Ryosuke SAIGUSA ,  Akira SAKAI ,  Yuichi KAWAHIRA ,  Masahiro HASEGAWA

IPC: G02F1/1335 ,  G02F1/13 ,  G02F1/1333

CPC classification number: G02F1/133531 ,  G02F1/1309 ,  G02F1/133308

Abstract: Provided is a display device in which warping of a display panel is sufficiently reduced or prevented. The display device includes: a display panel; and a polarizer, the polarizer being provided with at least one notch that extends inward from an outer edge of the polarizer.

公开(公告)号：US20250130458A1

公开(公告)日：2025-04-24

申请号：US18897132

申请日：2024-09-26

Applicant: Sharp Display Technology Corporation

Inventor： Jianeng XU ,  Yuichi KAWAHIRA ,  Masahiro HASEGAWA ,  Ryosuke SAIGUSA ,  Akira SAKAI

IPC: G02F1/1335

Abstract: The optical element includes: a first polarizer; a first retardation layer; a second retardation layer; and a second polarizer. First anisotropic molecules near the first polarizer are greater in tilt angle than first anisotropic molecules near an interface with the second retardation layer, with the tilt angles of the first anisotropic molecules continuously changing in a thickness direction. Second anisotropic molecules near the second polarizer are greater in tilt angle than second anisotropic molecules near an interface with the first retardation layer, with the tilt angles of the second anisotropic molecules continuously changing in a thickness direction. Transmission axes of the first and second polarizers are parallel. Slow axes of the first and second retardation layers are parallel. The transmission axis of the first polarizer is parallel to or orthogonal to the slow axes of the first and second retardation layers.

公开(公告)号：US20230314868A1

公开(公告)日：2023-10-05

申请号：US18127549

申请日：2023-03-28

Applicant: Sharp Display Technology Corporation

Inventor： Akira SAKAI ,  Ryosuke SAIGUSA ,  Yuichi KAWAHIRA ,  Masahiro HASEGAWA ,  Kiyoshi MINOURA

IPC: G02F1/1335

CPC classification number: G02F1/133528

Abstract: Provided is a liquid crystal display device in which reflection and light leakage from oblique directions are reduced or prevented. The liquid crystal display device includes, sequentially in the following order from a back surface side: a first polarizer; a liquid crystal panel; a second polarizer; a first retardation layer; and a third polarizer, wherein light transmitted in an oblique direction between the second polarizer and the third polarizer is elliptically polarized light.

公开(公告)号：US20250076553A1

公开(公告)日：2025-03-06

申请号：US18770711

申请日：2024-07-12

Applicant: Sharp Display Technology Corporation

Inventor： Ryosuke SAIGUSA ,  Akira SAKAI ,  Yuichi KAWAHIRA

IPC: G02B5/30

Abstract: Provided is an optical element that can achieve favorable optical characteristics. The optical element of the present invention includes, in the following order: a first alignment film; a first optically anisotropic layer containing a first anisotropic molecules; a second alignment film; and a second optically anisotropic layer containing a second anisotropic molecules.

公开(公告)号：US20230375873A1

公开(公告)日：2023-11-23

申请号：US18195848

申请日：2023-05-10

Applicant: Sharp Display Technology Corporation

Inventor： Yuichi KAWAHIRA ,  Masahiro HASEGAWA ,  Ryosuke SAIGUSA ,  Akira SAKAI

IPC: G02F1/1335 ,  G02F1/13363

CPC classification number: G02F1/133531 ,  G02F1/13363 ,  G02F1/133607

Abstract: Provided is a liquid crystal display device sequentially including: a first polarizer; a liquid crystal panel; a second polarizer; a biaxial retarder; a third polarizer; and a backlight including a light source and a prism sheet disposed closer to the viewing surface side than the light source is. The prism sheet includes prisms arranged in multiple columns on a surface close to the viewing surface side. The liquid crystal display has a light diffusion property curve having no side lobe or having a side lobe satisfying a ratio of a local maximum luminance to a local minimum luminance of 1.35 or less, the light diffusion property curve being obtained by plotting a luminance in a white display state in a direction perpendicular to ridge lines of the prisms against a polar angle.

公开(公告)号：US20240241300A1

公开(公告)日：2024-07-18

申请号：US18525939

申请日：2023-12-01

Applicant: Sharp Display Technology Corporation

Inventor： Ryosuke SAIGUSA ,  Yuichi KAWAHIRA ,  Akira SAKAI

IPC: G02B5/30 ,  G02F1/13363

CPC classification number: G02B5/3016 ,  G02F1/133636

Abstract: Provided are an optical element that has a high diffraction efficiency and can be produced through a simple procedure, a method of producing the optical element, and a mask set for use in production of the optical element. The optical element of the present invention includes an optically anisotropic layer containing anisotropic molecules. The optically anisotropic layer includes a first region that is a region where the anisotropic molecules are not twist-aligned in a film thickness direction of the optically anisotropic layer, and a second region that is a region where the anisotropic molecules are twist-aligned in the film thickness direction of the optically anisotropic layer.

公开(公告)号：US20240184162A1

公开(公告)日：2024-06-06

申请号：US18380870

申请日：2023-10-17

Applicant: Sharp Display Technology Corporation

Inventor： Yuichi KAWAHIRA ,  Masahiro HASEGAWA ,  Ryosuke SAIGUSA ,  Jianeng XU ,  Akira SAKAI

IPC: G02B5/30

CPC classification number: G02B5/3033 ,  G02B5/3083 ,  G02F1/133528

Abstract: Provided is an optical element including, sequentially from a viewing surface side toward a back surface side: a first polarizer; a negative C plate; a phase difference layer; and a second polarizer. A transmission axis of the first polarizer is parallel to a transmission axis of the second polarizer. The phase difference layer contains anisotropic molecules. In the phase difference layer, a tilt angle of the anisotropic molecules on a viewing surface side in the phase difference layer and a tilt angle of the anisotropic molecules on a back surface side in the phase difference layer are the same as each other and greater than 0°. A slow axis of the phase difference layer, in a case of lying in a tilt direction of the anisotropic molecules, is parallel to or perpendicular to the transmission axis of the first polarizer.

公开(公告)号：US20230384634A1

公开(公告)日：2023-11-30

申请号：US18199882

申请日：2023-05-19

Applicant: Sharp Display Technology Corporation

Inventor： Ryosuke SAIGUSA ,  Akira SAKAI ,  Yuichi KAWAHIRA ,  Masahiro HASEGAWA

IPC: G02F1/1335 ,  G02F1/13363

CPC classification number: G02F1/133528 ,  G02F1/13363 ,  G02F1/133562 ,  G02F1/133567 ,  G02F2413/06 ,  G02F2413/02

Abstract: Provided are an optical element that can achieve both color difference control and luminance reduction at an oblique viewing angle, and a liquid crystal display device including the optical element and having excellent display quality. The optical element includes: a first polarizer; a first phase difference layer; a second phase difference layer; and a second polarizer, the first polarizer, the first phase difference layer, the second phase difference layer, and the second polarizer being arranged in the stated order, the first phase difference layer satisfying the formula nx>ny≈nz, the second phase difference layer satisfying the formula nz>nx≈ny, the first polarizer and the second polarizer being linear polarizers, transmission axes of the first polarizer and the second polarizer being parallel to each other, a slow axis of the first phase difference layer being orthogonal to a polarization axis of the first polarizer.

公开(公告)号：US20240411073A1

公开(公告)日：2024-12-12

申请号：US18732729

申请日：2024-06-04

Applicant: Sharp Display Technology Corporation

Inventor： Ryosuke SAIGUSA ,  Yuichi KAWAHIRA ,  Akira SAKAI

IPC: G02B5/30

Abstract: Provided are a Pancharatnam-Berry phase optical element with less or no occurrence of disclinations and with excellent optical characteristics, and a method of producing a Pancharatnam-Berry phase optical element which is suitable for production of the Pancharatnam-Berry phase optical element above. The Pancharatnam-Berry phase optical element includes: a photoalignment film; and a liquid crystal layer in contact with the photoalignment film. The liquid crystal layer includes alignment domains with reference alignment azimuths of liquid crystal molecules defined by the photoalignment film, the reference alignment azimuths being different from one another. The alignment domains include first alignment domains and second alignment domains, with each of the second alignment domains being positioned between two of the first alignment domains and in contact with each of the two first alignment domains. A difference in reference alignment azimuth between the first alignment domains is not 90°.

公开(公告)号：US20240184163A1

公开(公告)日：2024-06-06

申请号：US18382267

申请日：2023-10-20

Applicant: Sharp Display Technology Corporation

Inventor： Yuichi KAWAHIRA ,  Masahiro HASEGAWA ,  Ryosuke SAIGUSA ,  Jianeng XU ,  Akira SAKAI

IPC: G02F1/1335 ,  G02F1/13357

CPC classification number: G02F1/133531 ,  G02F1/133605 ,  G02F1/133607 ,  G02F2202/40

Abstract: Provided is an optical element including a phase difference layer. The phase difference layer is a laminate of n first phase difference layers and m second phase difference layers. The n first phase difference layers each contain first anisotropic molecules with tilt angles different between a viewing surface side and a back surface side. The m second phase difference layers each contain second anisotropic molecules with tilt angles different between a viewing surface side and a back surface side. Slow axes of the n first phase difference layers are in a same orientation. Slow axes of the m second phase difference layers are in a same orientation. The slow axes of the n first phase difference layers and the slow axes of the m second phase difference layers are anti-parallel to each other and are parallel to or perpendicular to the transmission axis of the first polarizer.