Stanley Electric Co., Ltd

International Business Machines Corporation

Kazushige Ohta

Satoru Konishi

Yoji Oki

Mikio Kurihara

Fumihisa Hanzawa

Koji Kawada

Koichi Hanasaki

Takashi Noma

Takashi Obata

Hidiaki Sasaya

Tatsuo Fukui

Since a backlighting apparatus 1 for liquid crystal display is constituted such that a light guiding plate 2 and a frame 3 are molded together as a single unit provided with a deformation relaxation design, an attaching unit and parts, such as attaching feet and screws, for attaching the light guiding plate 2 to the frame 3 are not required, thereby making it possible to reduce the thickness and size of the backlighting apparatus 1 for liquid crystal display which has been restricted by the sizes of these parts.

Backlighting system for a liquid crystal display including an integrally

A surface light source apparatus is constituted such that an overhang portion overhanging a light source is provided on part of an end surface where the light source of an optical guide plate is arranged in such a manner that it is flush with the front surface of the optical guide plate and that an incident light control unit formed from a resin for diffusing and attenuating light is provided integratedly on at least an overhang portion side out of the overhang portion and the end surface of the optical guide plate, and accordingly light from the light source is transmitted through the overhang portion, radiated in an illumination direction, and diffused and attenuated by the incident light control unit to equalize the amount of light so that it can be used as illumination light. Thereby, the total area of the light emitting portions is increased.

Surface light source apparatus

An improved flat lighting device is provided. The flat lighting device comprises a light transmission member having a luminous surface formed on the front side thereof, a reflection surface on the rear side of said luminous surface, and an incident surface, and further comprises a light source and a reflecting mirror in the vicinity of the side perpendicular to said luminous surface. The thickness of the light transmission member between the luminous surface and the reflection surface is increased wider than that of the incident surface, the lower end of said incident surface is in contact with the reflection surface, said light source and said reflecting mirror are provided closer to the center of the light transmission member inside the end of the luminous surface, said inclined surface is formed by connecting the upper end of the incident surface and the end of the luminous surface, and said inclined surface is provided with a reflection function. According to the invention, the luminous surface can be more luminous owing to reflection by the inclined surface, and the flat lighting device itself can be formed so that the area is approximately equal to the display area of a liquid crystal display for lighting.

Flat lighting device

Growing community of inventors

Hadano, Japan

Kazushige Ohta