Illuminating device and display

Patent metadata

Field	Value
Publication number	US-9354378-B2
Application number	US-201414458765-A
Country	US
Kind code	B2
Filing date	Aug 13, 2014
Priority date	Feb 14, 2012
Publication date	May 31, 2016
Grant date	May 31, 2016

Abstract

An illuminating device includes a light source which outputs light, a light guide member having an incident surface on which the light from the light source is incident, an output surface through which the light is output from the light guide member, and a light deflection surface on which light deflection elements are formed such that the light is guided toward the output surface, and an isotropic light diffusion member positioned over the output surface of the light guide member. The light guide member has the incident surface extended in an X direction and includes a unit lens formed on the output surface and extended in a Y direction orthogonal to the X direction. A light-deflection element density D representing a number of the light deflection elements per unit area increases as the light deflection elements are positioned farther away from the incident surface.

First claim

The invention claimed is:

1. An illuminating device, comprising:
a light source configured to output light;
a light guide member having an incident surface on which the light from the light source is incident, an output surface through which the light is output from the light guide member, and a light deflection surface on which a plurality of light deflection elements are formed such that the light is guided toward the output surface; and
an isotropic light diffusion member positioned over the output surface of the light guide member,
wherein the light guide member has the incident surface extended in an X direction and includes a unit lens formed on the output surface and extended in a Y direction orthogonal to the X direction,
the light deflection elements are positioned such that a light-deflection element density D representing a number of the light deflection elements per unit area increases as the light deflection elements are positioned farther away from the incident surface,
the light deflection elements are formed in a pattern which is divided into a plurality of regions in the Y direction and are positioned in one of the regions such that a pitch L x in the X direction is substantially constant, and that adjacent light deflection elements in the Y direction are shifted from each other in the X direction by a half of the pitch L x and have a pitch L y in the Y direction which becomes shorter as the light deflection elements are positioned farther away from the incident surface,
G x , G y , β, γ, and θ are defined by following formulae (1), and L x and L y satisfy following formulae (2) in one of the regions which is adjacent to the incident surface:

G
x

=

H
L

⁢

tan
⁡

(

θ
-
β

)

+

a
x

2

G
y

=

H
L

⁢
tan
⁢

⁢
γ

+

a
y

2

β
=

sin

-
1

⁡

(

sin
⁡

(

θ
-
α

)

N
L

)

γ
=

sin

-
1

⁡

(

sin
⁢

⁢
α

N
L

)

θ
=

tan

-
1

⁡

[

10
P

⁢

∫

Assignees

• Toppan Printing Co Ltd

Inventors

• Ookubo Yu
• Nakagome Tomohiro

Classifications

• G02B6/0053

  Prismatic sheet or layer; Brightness enhancement element, sheet or layer · CPC title

• G02B6/0038

  Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide · CPC title

• G02B6/0051

  Diffusing sheet or layer · CPC title

• G02B6/0043 Primary

  provided on the surface of the light guide · CPC title

• G02B6/0061 Primary

  to provide homogeneous light output intensity · CPC title