Mitsubishi Electric Corporation

Rena Nishitani

Kuniko Kojima

Nami Nakano

Shuichi Kagawa

Muneharu Kuwata

Tomohiro Sasagawa

Hiroaki Sugiura

Jun Someya

Kazuhiko Tsutsumi

Eiji Niikura

Akihiro Nagase

Nobutaka Kobayashi

A planar light source deviceincludes a light sourceand a reflection member. The light sourceemits a light beamhaving directivity. The reflection memberhas a box shape including a single bottom-plate part, side-plate partsandconnected to the bottom-plate part, and an opening partfacing the bottom-plate part. The box shape has inner surfaces which are reflection surfaces. The bottom-plate parthas a quadrilateral shape including two facing short sides and two facing long sides. The light beamenters an inside of the box shape of the reflection memberthrough a side of the side-plate partconnected to the short side of the bottom-plate part, travels in a direction of the long side of the bottom-plate partwhile being reflected at the side-plate partsandconnected to the long sides of the bottom-plate part, and is emitted through the opening part. The reflection surfaces of the side-plate partsandconnected to the long sides of the bottom-plate partinclude regions at which the light beamis specularly reflected and regions at which the light beamis diffused and reflected.

Planar light source device and liquid crystal display apparatus

An angular intensity distribution shaping member includes a first surface for receiving a light beam emitted from a light source, the first surface having a length in a width direction that is longer than that in a thickness direction; second surfaces forming a plate-shaped light path on which the light beam incident from the first surface propagates by total reflection, the second surfaces including at least one adjustment surface for spreading a full angle of an angular intensity distribution, in the width direction, of the light beam incident from the first surface so that the full angle becomes wider than that of the angular intensity distribution of the light beam just after emission from the light source; and a third surface through which the light beam exits, the full angle of its angular intensity distribution in the width direction having been widened by the at least one adjustment surface.

Surface light source device and liquid crystal display device

A surface light source device includes a surface light-emitting light-guiding unit; an LED light source disposed at an outside position on a side of a direction of the light incident surface; a plurality of laser light sources disposed at an outside position on a side of a direction of a rear surface of the surface light-emitting light-guiding unit; and a laser-light-ray guiding unit arranged on a side of a rear surface of the surface light-emitting light-guiding unit. The laser-light-ray guiding unit guides the laser light rays emitted from the laser light sources so that the laser light rays enter through a light incident end surface, travel in a direction opposite to a direction in which the LED light source emits the LED light ray, and thereafter are reflected by a light bending part to enter through the light incident surface of the surface light-emitting light-guiding unit.

Surface light source device and liquid crystal display apparatus

A planar light source device includes a first light source for emitting a first light ray having a punctate spatial luminance distribution; a second light source for emitting a second light ray; a first spatial luminance distribution conversion portion for changing the first light ray to a linear spatial luminance distribution; a second spatial luminance distribution conversion portion for changing a spatial luminance distribution of the first and second light rays to a planar spatial luminance distribution; wherein the first light ray is a laser light; the second light ray has a divergence angle larger than the divergence angle of the first light ray when the first light ray is emitted from the first light source; and a slow-axis direction of the first light ray entering the second spatial luminance distribution conversion portion is parallel to an outgoing direction of the planar light.

Backlight device and liquid crystal display apparatus

Growing community of inventors

Tokyo, Japan

Rena Nishitani