Light guide film and backlight unit

Patent metadata

Field	Value
Publication number	US-2019383992-A1
Application number	US-201916544303-A
Country	US
Kind code	A1
Filing date	Aug 19, 2019
Priority date	Feb 22, 2017
Publication date	Dec 19, 2019
Grant date	—

Abstract

A light guide film that is bendable, has a strong resistance to impact, and can perform the adjustment of the brightness per region, and a backlight unit. The light guide film includes a plurality of optical units each of which includes a light guide portion and an emission portion; and a resin portion that is filled between the optical units adjacent to each other, in which the light guide portion guides light incident from a light source to the emission portion, the emission portion emits light guided and incident from the light guide portion from a light emission surface, the plurality of optical units are arranged in a plane direction of the light emission surfaces such that the light emission surfaces of the emission portions are parallel to each other, and the light guide portions and the emission portions are arranged in the plane direction of the light emission surfaces.

First claim

What is claimed is:

1 . A light guide film comprising:
a plurality of optical units each of which includes a light guide portion and an emission portion; and a resin portion that is filled between the optical units adjacent to each other, wherein the light guide portion guides light incident from a light source to the emission portion, the emission portion emits light guided and incident from the light guide portion from a light emission surface, the plurality of optical units are arranged in a plane direction of the light emission surfaces such that the light emission surfaces of the emission portions are parallel to each other, and the light guide portions and the emission portions are arranged in the plane direction of the light emission surfaces.

2 . The light guide film according to claim 1 ,
wherein the emission portion has a light extraction structure for emitting light from the light emission surface.

3 . The light guide film according to claim 1 ,
wherein the emission portion and the light guide portion of each of the optical units are joined to each other.

4 . The light guide film according to claim 3 ,
wherein the emission portion and the light guide portion of each of the optical units are joined to each other at a plurality of positions in a direction parallel to a light advancing direction in the light guide portion, and a distance between junction portions adjacent to each other decreases toward the light advancing direction in the light guide portion.

5 . The light guide film according to claim 3 ,
wherein the light guide portion of each of the optical units has a light extraction structure for emitting light toward the emission portion.

6 . The light guide film according to claim 1 ,
wherein the emission portion and the light guide portion of each of the optical units are distant from each other, and the resin portion is filled between the emission portion and the light guide portion.

7 . The light guide film according to claim 6 ,
wherein the light guide portion has a light extraction structure for emitting light toward the emission portion.

8 . The light guide film according to claim 1 ,
wherein a height of the light guide portion in a direction perpendicular to the light emission surface is 2 mm or less, and a width of the light guide portion in a direction perpendicular to a light advancing direction in the light guide portion is 5 mm or less.

9 . The light guide film according to claim 1 ,
wherein the plurality of optical units are covered with the resin portion.

10 . The light guide film according to claim 9 ,
wherein a thickness of a portion of the resin portion of laminated on the optical unit is 40 μm or more.

11 . The light guide film according to claim 1 ,
wherein a material forming the resin portion has a lower refractive index than a material forming the optical unit.

12 . The light guide film according to claim 1 , further comprising:
a substrate film, wherein the plurality of optical units are arranged on one main surface of the substrate film.

13 . A backlight unit comprising:
the light guide film according to claim 1 ; and a plurality of light sources that emits light toward each of the plurality of light guide portions of the optical units of the light guide film.

14 . The backlight unit according to claim 13 ,
wherein the light source is a light emitting diode or a semiconductor laser.

Assignees

• Fujifilm Corp

Inventors

• Sekiguchi Megumi
• Yamada Naoyoshi

Classifications

• G02B6/0043

  provided on the surface of the light guide · CPC title

• G02B6/0078 Primary

  Side-by-side arrangements, e.g. for large area displays · CPC title

• G02B6/0068

  Arrangements of plural sources, e.g. multi-colour light sources · CPC title

• F21S2/00

  Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction · CPC title

• G02B6/0028 Primary

  Light guide, e.g. taper · CPC title