Hitachi, Ltd.

Japan Display Inc.

Other

Hitachi Displays, Ltd.

Panasonic Liquid Crystal Display Co., Ltd.

Stanley Electric Co., Ltd

Wakamoto Pharmaceutical Co., Ltd.

Chugai Seiyaku Kabushiki Kaisha

Taisho Pharmaceutical Co., Ltd.

Hitachi Display Devices, Ltd.

Hitachi Electronic Devices Co., Ltd.

Nippon Zettoc Co., Ltd.

Nobuyuki Suzuki

Kikuo Ono

Makoto Hasegawa

Masafumi Okada

Masuyuki Ohta

Yoshiaki Nakayoshi

Masahiro Tanaka

Masahiro Ishii

Kazuhiro Ogawa

Munenori Motooka

Sukekazu Aratani

Keiichiro Ashizawa

Nobutake Konishi

Makoto Yoneya

Masahiro Yanai

Masahiro Ishi

Kazuhiko Yanagawa

Yasuo Tanaka

Toshio Nakayama

Shoji Shirai

Yasuyuki Mishima

Ryoji Oritsuki

Yasushi Nakano

Takeo Koito

Masayuki Mifune

Takashi Ota

Shunsuke Morishita

Ken Kagabu

Shoichi Wakita

Kazunari Ueda

Seigo Nakaya

Michihide Shibata

Haruhisa Hirata

Hiroyuki Shimokawa

Shinichi Komura

Ikuo Hiyama

Toshiki Kaneko

Tsunenori Yamamoto

Koji Sato

Takashi Adachi

Yoshiro Aoki

Makoto Tsumura

Junichi Hirakata

Akio Takimoto

Yoshiaki Takahashi

Kenichi Onisawa

Hidetaka Okada

Takashi Nakanishi

Fumio Inoue

Koichi Okuda

Masaru Takabatake

Masato Kashimura

Toshifumi Ozaki

Hiroaki Kijima

Masuyuki Ota

Makoto Maeda

Akiyoshi Tobe

Katsumi Hirota

Norifumi Imazeki

Hiroshi Nakamoto

Hirondo Nakatogawa

Hiroyuki Chikama

Hiroyuki Nagano

Masayuki Ohta

Tetsuo Asano

Kenichi Chahara

Takeshi Kuwada

Kotaro Aoki

Takeaki Okamura

Daisuke Nagafuchi

Kouichi Saitou

Misao Yasumuro

Toyotaro Nishihara

Yoshitami Ohashi

Hiroaki Kamiyama

Hidehiro Hanada

Yoshirou Watanabe

Azusa Kato

Hirokuni Osugi

Kentaro Hayashi

Keiichiro Kondo

Kouichi Harasaka

Syoichi Wakita

Yuuichi Harano

Kazuhiko Yamagawa

Yuji Aiba

Azusa Katou

Naomi Kokubo

Yoshiomi Yoshii

Naoki Mitsui

Takaya Hiraishi

A backlight includes: a light guide plate including a front surface and a back surface, the light guide plate including an end face that connects one edge of the front surface and one edge of the back surface, at least part of the end face being inclined at an angle other than a right angle relative to the front surface; and a light source that emits light, the light source being set in an arrangement enabling emission of the light parallel to the front surface towards the at least part of the end face of the light guide plate, wherein the light is incident on and refracted at the at least part of the end face, propagates inside a material of the light guide plate, is reflected off the back surface, and is surface-emitted from the front surface.

Backlight and display device

A lighting device according to the invention includes: a funnel shaped reflector including a first hole in which a light source is disposed, a second hole which emits light, and a reflecting curved surface connecting the first hole with the second hole, a first direction being defined as a direction of a line connecting a center of the first hole with a center of the second hole; a reflection plate, being opposed to the second hole of the funnel shaped reflector, major surface being tilted with a first angle; and a liquid crystal lens including an incident surface and opposing to the reflection plate, a major surface of the incident surface being tilted to the major surface of the reflection plate with a second angle, in which light emitted from the funnel shaped reflector is reflected at the reflection plate, and is emitted from the liquid crystal lens.

Lighting device

The incident surface is the inner surface of a recess including a bottom surface and an inwardly convex inner side. A tangent line on the free-form curve forms a smaller angle with the optical axis at a point closer to the bottom surface and a larger angle with the optical axis at a point farther from the bottom surface. The free-form curve has a curvature that is not constant. The curvature is maximized at a depth of one-third or less of a depth of the recess. The light enters the bottom surface only at a light distribution angle of three degrees. The light enters the inner side at a light distribution angle of more than three degrees. Light incident on the bottom surface exits through the emitting surface. Light incident on the inner side reflects off the outer side and exits through the emitting surface.

A backlight includes: a light source capable of emitting light spreading in first and second directions perpendicular to each other, from an optical axis; a first cylindrical lens that refracts and brings the light closer along the first direction to the optical axis, the first cylindrical lens overlapping with the light source in a third direction perpendicular to the first and second directions; a second cylindrical lens that refracts and brings the light even closer along the first direction to the optical axis, the second cylindrical lens overlapping with the light source and the first cylindrical lens in the third direction; and a reflector that reflects and brings the light closer along the second direction to the optical axis, the reflector being positioned between the first cylindrical lens and the second cylindrical lens in the third direction, the reflector avoiding overlap with the light source.

According to one embodiment, in an illumination device, a second light guide includes a plurality of fourth projecting portions provided in a first area of a fifth main surface opposing a prism sheet, a plurality of fifth projecting portions provided in a second area of a fifth main surface, and a plurality of sixth projecting portions on a sixth main surface opposing the fifth main surface, cross-sectional shapes of the fourth projecting portions and the fifth projecting portions are scalene triangles, and the fourth projecting portions and the fifth projecting portions are arranged in respective positions line-symmetrical position with respect to each other in plan view.

Illumination device

Disclosed is a lighting device including a light guide plate, a plurality of LEDs, a prism sheet disposed on a side toward the upper surface of the light guide plate, and a reflective sheet disposed on a side toward the lower surface of the light guide plate. The plurality of LEDs are arrayed on a side surface corresponding to a first side of the light guide plate in a first direction along the first side. The prism sheet includes a first prism array that is formed on a surface facing the light guide plate. The first prism array includes prisms that are extended in the first direction and arrayed in a second direction perpendicular to the first direction. The upper surface of the light guide plate and the prism sheet sandwich a diffusion sheet therebetween. The diffusion sheet has a haze value between 30% and 65% when measured in compliance with JIS K7361. The prisms on the first prism array have an apex angle between 55 degrees and 66 degrees.

According to one embodiment, an electronic device includes a liquid crystal panel and a camera. The liquid crystal panel includes a display area, an incident light control area, and an emitted light control area. The camera includes a light-entering surface and a light source. The liquid crystal panel is configured to selectively transmit visible light emitted from the light source in the emitted light control area and to selectively transmit visible light from outside in order to cause visible light to enter the camera from the outside in the incident light control area.

Electronic device

The purpose of the present invention is to realize a lighting device of thin, low power consumption and high emitting efficiency. A concrete structure of the inventions is as follows. A lighting device including a first light guide and a second light guide stacked on the first light guide, a reflecting sheet disposed under the first light guide, and a prism sheet disposed on the first light guide, in which a concentric first prism array is formed on the prism sheet, a plurality of first LEDs are disposed along a circumferential direction of a side wall of a first hole of the first light guide, a plurality of second LEDs are disposed along a circumferential direction of a side wall of a second hole of the second light guide, and the plurality of the first LEDs and the plurality of the second LEDs are displaced in azimuth direction.

Lighting device with LED facing a disc shaped light guide

The purpose is to realize a lighting device of thin, small light distribution angle, and less leak light. Further, the purpose is to realize a lighting device which can control light beam accurately with liquid crystal lenses. The structure of the invention is as follows. A lighting device including: a reflector cylinder including a mirror thereinside; and a liquid crystal lens assembly that is disposed at a light emitting surface of the reflector cylinder and includes a plurality of liquid crystal lenses being stacked, in which the liquid crystal lens assembly includes a light shading film which defines a light emitting area of the liquid crystal lens assembly and which is formed in parallel with the light emitting surface of the reflector cylinder.

According to one embodiment, a light emitting device includes a light guide plate with a plurality of first protrusion parts arranged along a first direction and extending along a second direction which crosses the first direction, and a prism sheet, wherein a cross-sectional shape of each of the first protrusion parts along the first direction has an apex angle between 55 degrees and 65 degrees, inclusive, the light guide plate includes a plurality of second protrusion parts which extend along the first direction and are arranged along the second direction, and a cross-sectional shape of each of the second protrusion parts along the second direction has a base angle between 1 degree and 3 degrees, inclusive.

Light emitting device and illumination device

A lighting device, comprises: a first reflector that includes a first hole where a light source is disposed, a second hole that emits light, and a reflection curved surface that connects the first hole and the second hole to each other, and the first reflector emits light to a first direction; a liquid crystal lens disposed to cover the second hole of the first reflector; and a polygonal pyramid including a bottom surface and a plurality of inclined surfaces, and being disposed so that the plurality of inclined surfaces oppose the liquid crystal lens. The plurality of inclined surfaces are reflection surfaces, and on the reflection surfaces, a traveling path of the light traveling to the first direction changes to a second direction. The liquid crystal lens can configure lenses corresponding to the plurality of inclined surfaces.

A lighting device including: a light guide, a reflecting sheet and a first prism sheet, in which a first white LED, a second white LED and a third white LED are disposed in a same interval on a first side surface and on a second side surface, which opposes to the first side surface, a first prism array extending in a first direction and arranged in a second direction is formed on the major surface, a second prism array extending in a second direction and arranged in a first direction is formed on the back surface, the reflecting sheet is disposed under the back surface of the light guide, the first prism sheet is disposed on the major surface of the light guide, and a third prism array, extending in the second direction and arranged in the first direction is formed on the back surface of the first prism sheet.

Lighting device having a light guide with prism array formed thereon and a prism sheet and white LEDs

A lighting device including a first unit and a second unit, the first unit including: a first funnel shaped reflector having a first neck, a first opening, a first reflecting surface and a first light axis, a first LED emitting a first color disposed on the first neck, a first liquid crystal lens disposed at the first opening, a second unit including: a second funnel shaped reflector having a second neck, a second opening, a second reflecting surface and a second light axis, a second LED emitting a second color disposed on the second neck, a second liquid crystal lens disposed at the second opening; a length hof the first funnel shaped reflector is same as a length of the second funnel shaped reflector, and a diameter dof the first opening is same as a diameter of the second opening, and h/dis two or more.

The purpose of the present invention is to realize a lighting device of thin, low power consumption and small light distribution angle. The present invention takes the following structure to realize the above task: A lighting device having an emitting surface and a bottom opposing to the emitting surface including:

The purpose of the present invention is to realize a lighting device of small light distribution angle and less leakage light and further to realize a lighting device in which the light beam is easy to control. The following is an example of the structure to meet the above purpose. A lighting device including: a light guide; LEDs set at a side surface of the light guide; a prism sheet set on a major surface of the light guide, in which a first louver which extends in a first direction and, a second louver which extends in an orthogonal direction to the first direction are superposed on the prism sheet.

Growing community of inventors

Mobara, Japan

Nobuyuki Suzuki