公开(公告)号：US12174483B2

公开(公告)日：2024-12-24

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: G02F1/1335 ,  G02B5/30 ,  G02F1/13363 ,  G02F1/1337

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：US11874549B2

公开(公告)日：2024-01-16

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 ,  G02F2413/02 ,  G02F2413/06

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：US11934069B2

公开(公告)日：2024-03-19

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: G02F1/13363 ,  G02F1/1335

CPC classification number: G02F1/13363 ,  G02F1/133531 ,  G02F1/133536

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.

公开(公告)号：US11841575B2

公开(公告)日：2023-12-12

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 ,  G02F1/1343

CPC classification number: G02F1/133531 ,  G02F1/1368 ,  G02F1/1343 ,  G02F1/133512 ,  G02F1/133514 ,  G02F1/133528

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 substate, a second polarizing plate, and a backlight. The first polarizing plate, the first substate, 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：US11822181B1

公开(公告)日：2023-11-21

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：US12204197B2

公开(公告)日：2025-01-21

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 ,  G02F1/1333

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：US11550187B2

公开(公告)日：2023-01-10

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：US12174482B2

公开(公告)日：2024-12-24

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

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：US11774813B2

公开(公告)日：2023-10-03

申请号：US18078404

申请日：2022-12-09

Applicant: Sharp Display Technology Corporation

Inventor： Yuichi Kawahira ,  Akira Hirai ,  Akira Sakai

IPC: G02F1/1335 ,  G02F1/1362 ,  G02F1/1368 ,  G02F1/1333 ,  G02F1/135 ,  G03F7/039

CPC classification number: G02F1/1351 ,  G02F1/1368 ,  G02F1/133345 ,  G02F1/133519 ,  G02F1/133553 ,  G03F7/039 ,  G02F1/136286

Abstract: Provided are a liquid crystal display device that can increase light use efficiency and reduce external light reflection, and a method of producing the liquid crystal display device. The liquid crystal display device sequentially includes, from a back surface side toward a viewing surface side: a first substrate; a liquid crystal layer; and a second substrate, the liquid crystal display device including sub-pixels each including an optical opening allowing light to pass through, the first substrate sequentially including, from the back surface side toward the viewing surface side: a supporting substrate; a metal layer surrounding the optical openings; and a resist layer being superimposed with the metal layer and being in contact with the metal layer, an end of the resist layer being superimposed with an end of the metal layer and having a taper angle θ of 40° or more.

公开(公告)号：US11988918B1

公开(公告)日：2024-05-21

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.