Hitachi Chemical Company, Ltd.

Teruo Teshima

Yasushi Sugimoto

Masato Taya

Tokutarou Komatsu

Tadashi Okuda

Tetsuya Hoshino

Toshikatsu Shimazaki

Tomo Dobashi

A back light device realizing improvement in hotspots and bright line in the region of light incidence and of darkness arising in between light sources is provided by forming the reflective surface of the reflector as a structured face comprising an iteration of prism elements of trapezoidal section.

Reflector and backlight device

A light guide plate includes: a plate surrounded by two main surfaces and a plurality of end surfaces connecting the main surfaces, one of the end surfaces designated as an entrance surface, one of the main surfaces designated as a reflection surface; a first reflection element provided in a first region of the reflection surface separated from the entrance surface, and configured to reflect a light incident from the entrance surface in a first angle with respect to the reflection surface; and a second reflection element provided in a second region of the reflection surface between the entrance surface and the first region, and configured to reflect the light in a second angle different from the first angle with respect to the reflection surface.

Light guide plate and backlight unit

An optical filmhas a transparent base filmmade of polyethylene terephthalate (PET), a prism made of photo-curing resin such as acryl modified epoxy on an incident surfacethat is one face of the base film, and a hologram similarly made of photo-curing resin on an exit surfaceopposing the incident surface. The prism has grooves or ridges each having a substantially triangular cross section to totally reflect incident light so as to bend the light into a direction perpendicular to the exit surfaceThe hologram anisotropically diffuses light exiting from the exit surface, to improve brightness.

Optical film and surface light source using it

A backlight unit includes: light guide plate surrounded by main surfaces and end surfaces, one end surface facing a light source designated as entrance surface, one main surface designated as emitting surface; first prism sheet provided above the light guide plate, having first prism columns on a top surface and second prism columns on a bottom surface, each first prism column has first ridge line parallel or perpendicular to the entrance surface, each second prism column has second ridge line extending in a different direction from the first ridge line; second prism sheet provided above the first prism sheet, having third prism columns abutting each other on a top surface, each third prism column has third ridge line extending in a direction different from the first and second ridge lines; and reflection sheet facing the light guide plate below the light guide plate.

Backlight unit

A backlight device with improved efficiency in the utilization of light and a liquid crystal display device providing this backlight device are provided, the backlight device comprising at least a light sourcea light guide plateand a reflectorin which the light guide platefurther provides an entry faceinto which light from the light source is incident, a lower facesubstantially perpendicular to the entry faceand that opposes the reflectorand an upper facethat opposes the lower faceand reflective elementsthat are capable of reflecting such that light is emitted from the lower facetoward the reflectorare disposed on the upper faceof the light guide plate.

Growing community of inventors

Chikusei, Japan

Teruo Teshima