公开(公告)号：US20240160052A1

公开(公告)日：2024-05-16

申请号：US18379427

申请日：2023-10-12

Applicant: Sharp Display Technology Corporation

Inventor： Koji MURATA ,  Junichi MASUDA ,  Shugo YAGI ,  Akira HIRAI ,  Hiroshi TSUCHIYA ,  Takashi SATOH ,  Akira SAKAI ,  Kiyoshi MINOURA

IPC: G02F1/13 ,  G02F1/1335 ,  G02F1/1347

CPC classification number: G02F1/1323 ,  G02F1/133528 ,  G02F1/1347

Abstract: A viewing angle-controlling liquid crystal panel sequentially includes a first polarizing plate; a first liquid crystal panel; a second polarizing plate; a second liquid crystal panel; and a third polarizing plate, wherein an azimuthal angle φP1 of the absorption axis of the first polarizing plate, an azimuthal angle φ1 of a director of liquid crystal molecules near the first substrate and an azimuthal angle φ2 of a director of liquid crystal molecules near the second substrate in the first liquid crystal panel, an azimuthal angle φP2 of the absorption axis of the second polarizing plate, an azimuthal angle φ3 of a director of liquid crystal molecules near the third substrate and an azimuthal angle φ4 of a director of liquid crystal molecules near the fourth substrate in the second liquid crystal panel, and an azimuthal angle φP3 of the absorption axis of the third polarizing plate satisfy specific formulas.

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.

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：US20230229048A1

公开(公告)日：2023-07-20

申请号：US18096485

申请日：2023-01-12

Applicant: Sharp Display Technology Corporation

Inventor： Akira SAKAI ,  Masahiro HASEGAWA

IPC: G02F1/137 ,  G02B30/26

CPC classification number: G02F1/137 ,  G02B30/26 ,  G02F1/13363

Abstract: Provided is an optical element including: a first liquid crystal cell; and a second liquid crystal cell, with no polarizing plate between the first and second liquid crystal cells. The first liquid crystal cell includes a first liquid crystal layer containing first liquid crystal molecules, and a first electrode pair which applies voltage to the first liquid crystal layer. The second liquid crystal cell includes a second liquid crystal layer containing second liquid crystal molecules, and a second electrode pair which applies voltage to the second liquid crystal layer. With no voltage applied to the first and second liquid crystal layers, an alignment direction of the first liquid crystal molecules near the second liquid crystal cell in the first liquid crystal layer is parallel to an alignment direction of the second liquid crystal molecules near the first liquid crystal cell in the second liquid crystal layer in a plan view.

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：US20240210721A1

公开(公告)日：2024-06-27

申请号：US18521019

申请日：2023-11-28

Applicant: Sharp Display Technology Corporation

Inventor： Takahiro SASAKI ,  Hiromi MATSUMOTO ,  Takashi SATOH ,  Akira SAKAI

IPC: G02B30/25 ,  G02F1/1335 ,  G02F1/1339

CPC classification number: G02B30/25 ,  G02F1/133512 ,  G02F1/1339

Abstract: Provided are an active retarder for 3D image display with an improved balance of display quality between the left and right eyes and with sufficiently reduced crosstalk, and a display device using the same. The active retarder for 3D image display, the active retarder including: an optical laminate that includes: a pair of substrates; a pair of electrodes disposed between the pair of substrates; a liquid crystal layer formed from a liquid crystal material containing liquid crystal molecules; columnar spacers; and light-blocking components each shielding the corresponding columnar spacer from light limitedly.

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.