公开(公告)号：US12135457B2

公开(公告)日：2024-11-05

申请号：US18430928

申请日：2024-02-02

Applicant: Japan Display Inc. ,  OSAKA UNIVERSITY

Inventor： Koichi Igeta ,  Shinichiro Oka ,  Yasushi Tomioka ,  Junji Kobashi ,  Hiroyuki Yoshida

IPC: G02B6/27 ,  G02F1/13

Abstract: According to one embodiment, a liquid crystal optical element includes an optical waveguide including a first main surface and a second main surface opposed to the first main surface, an alignment film disposed on the second main surface, a liquid crystal layer which overlaps the alignment film, which includes cholesteric liquid crystals, and which reflects at least part of light incident through the optical waveguide toward the optical waveguide, and a transparent first protective layer which overlaps the liquid crystal layer, and which is formed of a water-soluble polymer or a fluorine-based resin.

公开(公告)号：US12153313B2

公开(公告)日：2024-11-26

申请号：US18460784

申请日：2023-09-05

Applicant: Japan Display Inc.

Inventor： Takeo Koito ,  Junji Kobashi

IPC: G02F1/1347 ,  G02F1/13 ,  G02F1/1335 ,  G02F1/13363 ,  G02F1/29

Abstract: The display device includes an image display panel emitting linearly polarized light from a display area, a retardation plate on the image display panel, a variable phase difference element located on the retardation plate and providing phase difference to an incoming light, and a liquid crystal diffraction element on the variable phase difference element. The variable phase difference element is switchable between an on state, an off state, and an intermediate state, and the phase change of the intermediate state is smaller than the phase change of the on state. A first emission direction of a first emitted light in the on state, a second emission direction of a second emitted light in the off state, and a third emission direction of a third emitted light in the intermediate state are different from each other.

公开(公告)号：US11545101B2

公开(公告)日：2023-01-03

申请号：US17828644

申请日：2022-05-31

Applicant: Japan Display Inc.

Inventor： Kazunari Tomizawa ,  Kazuhiko Sako ,  Junji Kobashi ,  Tomoyuki Ishihara

IPC: G09G3/36 ,  G09G3/34

Abstract: According to an aspect, a display device includes: a first liquid crystal panel; a second liquid crystal panel; a light source configured to emit light; and a controller configured to control the first liquid crystal panel and the second liquid crystal panel based on an image signal corresponding to a resolution of the second liquid crystal panel. The first liquid crystal panel includes dimming pixels, and the second liquid crystal panel includes pixels. More than one of the pixels is arranged within a region of each of the dimming pixels. The controller performs blurring processing and determination of dimming gradation values as processing related to operation of the second liquid crystal panel. Each of the dimming gradation values corresponds to a highest gradation value set after the blurring processing among gradation values set for the more than one pixel arranged within the region of each of the dimming pixels.

公开(公告)号：US11579492B2

公开(公告)日：2023-02-14

申请号：US17655676

申请日：2022-03-21

Applicant: Japan Display Inc.

Inventor： Shinichiro Oka ,  Yasushi Tomioka ,  Koichi Igeta ,  Junji Kobashi

IPC: G02F1/1337 ,  G02F1/1335

Abstract: According to one embodiment, a liquid crystal optical element includes a substrate, a plurality of structures, a first liquid crystal layer including a plurality of liquid crystal molecules having alignment directions fixed, and a second liquid crystal layer including a plurality of liquid crystal molecules having alignment directions fixed. In an area overlapping a groove, a first director of the first liquid crystal layer extends along the groove, and a second director of the second liquid crystal layer is uniformly aligned with the first director of the second surface side, on the third surface side, and turns in planar view.

公开(公告)号：US20220392418A1

公开(公告)日：2022-12-08

申请号：US17828644

申请日：2022-05-31

Applicant: Japan Display Inc.

Inventor： Kazunari Tomizawa ,  Kazuhiko Sako ,  Junji Kobashi ,  Tomoyuki Ishihara

IPC: G09G3/36 ,  G09G3/34

Abstract: According to an aspect, a display device includes: a first liquid crystal panel; a second liquid crystal panel; a light source configured to emit light; and a controller configured to control the first liquid crystal panel and the second liquid crystal panel based on an image signal corresponding to a resolution of the second liquid crystal panel. The first liquid crystal panel includes dimming pixels, and the second liquid crystal panel includes pixels. More than one of the pixels is arranged within a region of each of the dimming pixels. The controller performs blurring processing and determination of dimming gradation values as processing related to operation of the second liquid crystal panel. Each of the dimming gradation values corresponds to a highest gradation value set after the blurring processing among gradation values set for the more than one pixel arranged within the region of each of the dimming pixels.

公开(公告)号：US12147130B2

公开(公告)日：2024-11-19

申请号：US17972904

申请日：2022-10-25

Applicant: Japan Display Inc.

Inventor： Kazunari Tomizawa ,  Tsutomu Harada ,  Junji Kobashi ,  Shinichiro Oka ,  Yosuke Hyodo

IPC: G02F1/1347 ,  G02F1/1335

Abstract: According to one embodiment, in a display device a first panel includes a first polarizing plate, a second polarizing plate, and a first liquid crystal panel interposed between the first polarizing plate and the second polarizing plate, a second panel includes a third polarizing plate, a fourth polarizing plate, and a second liquid crystal panel interposed between the third polarizing plate and the fourth polarizing plat, and a polarizing plate, which is located second from a surface close to an illumination device and a surface closest to an observer, has an extinction ratio that is lower than that of each of the other polarizing plates.

公开(公告)号：US11636816B2

公开(公告)日：2023-04-25

申请号：US17526233

申请日：2021-11-15

Applicant: JAPAN DISPLAY INC.

Inventor： Tomoyuki Ishihara ,  Junji Kobashi

IPC: G09G3/36 ,  G02F1/1347 ,  G09G3/34

Abstract: A display device incudes: a display panel including a plurality of pixels; and a dimming panel that is disposed between the display panel and a light source of light to be emitted to the display panel and includes a plurality of dimming pixels. When one of the pixels produces an output at highest luminance and the other pixels produce an output at lowest luminance to the display panel, the light is transmitted through a predetermined one of the dimming pixels located on an optical axis of the light that is emitted to the one of the pixels and through the other dimming pixels arranged around the predetermined dimming pixel. A degree of transmission of the light through the other dimming pixels decreases as the light is away along one direction from the predetermined dimming pixel, and there are a plurality of directions having different degrees of the decrease.

公开(公告)号：US11536885B2

公开(公告)日：2022-12-27

申请号：US17450479

申请日：2021-10-11

Applicant: Japan Display Inc.

Inventor： Shinichi Komura ,  Junji Kobashi ,  Koichi Okuda ,  Ken Onoda ,  Hiroaki Kijima

IPC: G02B27/01 ,  G02F1/1335 ,  G02F1/13363 ,  G02B5/30 ,  G02B30/34

Abstract: According to one embodiment, a display device includes a display panel configured to emit display light of linearly polarized light, a first semi-transparent element transmitting first circularly polarized light and reflecting second circularly polarized light, a first retardation film, a second semi-transparent element reflecting the first circularly polarized light and transmitting the second circularly polarized light, a second retardation film having a refractive anisotropy in which refractive indexes of directions orthogonal to each other in a plane are substantially equivalent to each other and a refractive index in a normal is different from a refractive index in a plane, and a first element having a lens action of condensing the second circularly polarized light.

公开(公告)号：US12154525B2

公开(公告)日：2024-11-26

申请号：US18507211

申请日：2023-11-13

Applicant: Japan Display Inc.

Inventor： Junji Kobashi

IPC: G09G3/36 ,  G02F1/1334 ,  G09G3/20

Abstract: A display device includes: a display panel including a display region overlapping pixels; a light source device disposed on a lateral side of the display panel; and a drive circuit configured to calculate an output gradation value based on an input gradation value and to output a pixel drive signal corresponding to the output gradation value to a corresponding one of the pixels. The pixels include a first pixel and a second pixel arranged in a first direction from a first side surface toward a second side surface. The second pixel is between the first pixel and the second side surface. When the input gradation value for the first pixel is equal to the input gradation value for the second pixel, the drive circuit is configured to set the output gradation value for the second pixel to be larger than the output gradation value for the first pixel.

公开(公告)号：US12007594B2

公开(公告)日：2024-06-11

申请号：US18465199

申请日：2023-09-12

Applicant: Japan Display Inc.

Inventor： Junji Kobashi

IPC: G02B5/30 ,  G02B5/18 ,  G02F1/1335

CPC classification number: G02B5/3016 ,  G02B5/1814 ,  G02F1/133536 ,  G02F1/133607

Abstract: According to one embodiment, a polarization conversion element includes a first light guide including a first main surface and a side surface, a transmissive first polarization grating opposed to the side surface, and a reflective second polarization grating opposed to the first main surface. The first polarization grating is configured to diffract first circularly polarized light of unpolarized incident light and to diffract second circularly polarized light which rotates in a direction opposite to the first circularly polarized light in a direction different from the first circularly polarized light. The second polarization grating is configured to reflect the first circularly polarized light on the reflective surface.