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：US20240345434A1

公开(公告)日：2024-10-17

申请号：US18595844

申请日：2024-03-05

Applicant: Sharp Display Technology Corporation

Inventor： Yuichi KAWAHIRA ,  Masahiro Hasegawa ,  Ryosuke Saigusa ,  Jianeng Xu ,  Akira Sakai

IPC: G02F1/1335

CPC classification number: G02F1/133519 ,  G02F1/133512

Abstract: A color filter includes a frame portion in which the reflectance of light incident from the transparent substrate side is less than the reflectance of light incident from the overcoat layer side and an opening portion in which the reflectance of light incident from the transparent substrate side is greater than the reflectance of light incident from the overcoat layer side. The color filter satisfies nbc×dbc

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：US20230333427A1

公开(公告)日：2023-10-19

申请号：US18134517

申请日：2023-04-13

Applicant: Sharp Display Technology Corporation

Inventor： Akira HIRAI ,  Yuichi KAWAHIRA ,  Akira SAKAI

IPC: G02F1/1335 ,  G02F1/1368

CPC classification number: G02F1/133531 ,  G02F1/1368

Abstract: A liquid crystal display device includes a first polarizing plate, a first substrate including a thin-film transistor, a liquid crystal layer containing liquid crystal molecules, a second substrate, a second polarizing plate, and a backlight. The first polarizing plate, the first substrate, the liquid crystal layer, the second substrate, the second polarizing plate, and the backlight are arranged in this order. The first substrate has a display area and a frame area placed on an outer edge of the display region. The liquid crystal display device has an ink layer between the frame area of the first substrate and the first polarizing plate. The liquid crystal display device has an internal reflectance ratio y of 0.2 to 0.3. The internal reflectance ratio y is expressed by Formula (1-1).

公开(公告)号：US20220276537A1

公开(公告)日：2022-09-01

申请号：US17671913

申请日：2022-02-15

Applicant: Sharp Display Technology Corporation

Inventor： Yuichi KAWAHIRA ,  Takako KOIDE ,  Masahiro HASEGAWA ,  Akira SAKAI

IPC: G02F1/13363 ,  G02F1/1335

Abstract: The liquid crystal display device includes: a first polarizer having a first transmission axis; a liquid crystal panel; a second polarizer having a second transmission axis; a biaxial retarder having a slow axis parallel to the second transmission axis; a third polarizer having a third transmission axis parallel to the second transmission axis; and a backlight, a back side polarizer portion that includes the second polarizer, the biaxial retarder, and the third polarizer satisfying the following formula (1): ΔYI2=YI2′− YI2

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.

公开(公告)号：US20230367156A1

公开(公告)日：2023-11-16

申请号：US18195917

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 ,  G06F1/16

CPC classification number: G02F1/133528 ,  G02F1/13363 ,  G06F1/163 ,  G02F2413/01 ,  G02F2413/02 ,  G02F2413/08 ,  G02F2413/12 ,  G02F2413/06

Abstract: Provided is a liquid crystal display device having high luminance and high CR in a front direction and especially useful as a head-mounted liquid crystal display device, for example. The liquid crystal display device includes: a liquid crystal panel; an optical element; and a backlight, arranged in this order from a viewing surface side. The optical element includes a first polarizer, a retardation layer, and a second polarizer. The first polarizer, the retardation layer, and the second polarizer are arranged in this order from the viewing surface side. The first polarizer and the second polarizer are reflection polarizers. A reflection axis of the first polarizer and a reflection axis of the second polarizer are parallel to each other. In oblique directions at azimuths of 0°, 45°, and 90° at a polar angle of 60°, a polarization state of light incident on the first polarizer is elliptical polarization.

公开(公告)号：US20230077158A1

公开(公告)日：2023-03-09

申请号：US17893313

申请日：2022-08-23

Applicant: Sharp Display Technology Corporation

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

IPC: G02F1/1335 ,  G02F1/13363

Abstract: An optical element includes, sequentially from a viewing surface side toward a back surface side: a viewing-surface-side polarizer; a retarder; and a back-surface-side polarizer, a transmission axis of the viewing-surface-side polarizer and a transmission axis of the back-surface-side polarizer being parallel to each other, the optical element having an average angle θ between an angle θ1 and an angle θ2 of greater than 0° and smaller than 90°, wherein the angle θ1 represents an angle formed by an optical axis of the retarder on a surface close to the back surface with the surface close to the back surface; and the angle θ2 represents an angle formed by an optical axis of the retarder on a surface close to the viewing surface with the surface close to the viewing surface.