US 2003/0169386 A1 · Light guide plate and display device

Abstract

A display device includes a light guide plate. A light incident on the light guide plate from a linear light source is reflected by a reflecting surface of each of prisms and emitted from a lower surface of the light guide plate. The emitted light is irradiated onto a liquid crystal panel, reflected by a reflecting layer provided within the liquid crystal panel and advances toward a front direction of a screen. Herein, the light guide plate has on its lower surface as an emission surface a number of minute protrusions each having a shape of triangle in vertical cross-section in a manner that the protrusions cover with no space therebetween a whole effective area of the lower surface, and thereby to obtain an antireflection effect.

Claims8

Dependent claims

A light guide plate having a surface, comprising:

a plurality of protrusions which are formed on said surface with a pitch shorter than a wavelength of a light, each having a cross-section shape that a width is made gradually narrower, wherein a space between bases of adjacent protrusions is uniform.

Dependencies are inferred from the claim text.

Facts

Application

10/379,791Filed 6 Mar 2003

Priority

JP 2002-609436 Mar 2002

Published

11 Sep 2003

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

G02B 6/0055
Provided by one optical element, or plurality thereof, placed on the light output side of the light guide: reflecting element, sheet or layer
G02B 5/08
Optical elements other than lenses: mirrors
G02B 6/0036
Provided on the surface of the light guide or in the bulk of it: 2-D arrangement of prisms, protrusions, indentations or roughened surfaces
G02B 6/0038
Provided on the surface of the light guide or in the bulk of it: linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves,…

Light guide plate and display device

Life of this patent

Light guide plate and display device

Life of this patent

Abstract

Claims8