Backlight module and display device including the same

Patent metadata

Field	Value
Publication number	US-2017031083-A1
Application number	US-201615291136-A
Country	US
Kind code	A1
Filing date	Oct 12, 2016
Priority date	Jun 9, 2015
Publication date	Feb 2, 2017
Grant date	—

Abstract

A backlight module includes a light source, a light guide plate, and a quantum dot enhancement film. The light guide plate has a light-incident side that faces toward the light source, a surrounding side that is connected to the light-incident side to constitute an outer periphery of the light guide plate, and a microstructure unit that is disposed adjacent to the surrounding side of the light guide plate. The quantum dot enhancement film is stacked on the light guide plate.

First claim

What is claimed is:

1 . A backlight module, comprising:
a light source; a light guide plate having a light-incident side that faces toward said light source, a surrounding side that is connected to said light-incident side to constitute an outer periphery of said light guide plate, and a first microstructure unit that is disposed adjacent to said surrounding side of said light guide plate; and a quantum dot enhancement film stacked on said light guide plate.

2 . The backlight module according to claim 1 , wherein said first microstructure unit is arranged along a direction from said surrounding side toward a center of said light guide plate, so as to define a microstructure-free region surrounded by said first microstructure unit.

3 . The backlight module according to claim 1 , wherein said light guide plate includes a central portion and a lateral portion that surrounds said central portion, and that has said light-incident side and said surrounding side, said first microstructure unit being formed only on said lateral portion without being formed on said central portion.

4 . The backlight module according to claim 1 , wherein said light guide plate further has opposite top and bottom surfaces, one of said top and bottom surfaces faces toward said quantum dot enhancement film, and said first microstructure unit is located on one of said top or bottom surfaces.

5 . The backlight module according to claim 1 , wherein said first microstructure unit includes a plurality of first microstructures having a surface density that is negatively correlated with a distance to said surrounding side of said light guide plate.

6 . The backlight module according to claim 1 , wherein said first microstructure unit includes a plurality of first microstructures, and said first microstructures include a plurality of indentations having depths that decrease as a distance to said surrounding side of said light guide plate increases.

7 . The backlight module according to claim 1 , wherein said first microstructure unit includes a plurality of first microstructures, and said first microstructures include a plurality of protrusions having heights that decrease as a distance to said surrounding side of said light guide plate increases.

8 . The backlight module according to claim 1 , wherein said first microstructure unit includes a plurality of first microstructures, and said first microstructures include a plurality of protrusions having height-over-width ratios that decrease as a distance to said surrounding side of said light guide plate increases.

9 . The backlight module according to claim 1 , wherein said first microstructure unit includes a plurality of first microstructures, and said first microstructures include a plurality of indentations having depth-over-width ratios that decrease as a distance to said surrounding side of said light guide plate increases.

10 . The backlight module according to claim 1 , wherein said quantum dot enhancement film has
a light incident surface facing toward said light guide plate, an optical surface that is opposite to said light incident surface, and a second microstructure unit that is located on said optical surface, that is disposed corresponding in position to said first microstructure unit and that includes a plurality of second microstructures.

11 . The backlight module according to claim 1 , wherein:
said surrounding side of said light guide plate includes a central segment opposite to said light-incident side, and a pair of lateral segments interconnecting said light-incident side and said central segment; and said first microstructure unit includes a plurality of third microstructures adjacent to said central segment.

12 . The backlight module according to claim 11 , wherein said third microstructures are arranged from said central segment of said surrounding side toward said light-incident side.

13 . The backlight module according to claim 11 , wherein said third microstructures are extended along an axis normal to said light-incident side and have lengths that decrease as the distance to a nearest one of said lateral segments of said surrounding side of said light guide plate increases.

14 . The backlight module according to claim 1 , further comprises a casing unit defining a receiving space in which said light source, said light guide plate and said quantum dot enhancement film are disposed, wherein:
said casing unit includes a back plate, and a side frame cooperating with the back plate to define the receiving space; and said side frame has
an extending portion that is connected to and extends from an outer periphery of said back plate, and
a projecting portion that is connected to said extending portion, that is projected inwardly to the receiving space and that has an inner reflective surface.

15 . The backlight module according to claim 14 , wherein said projecting portion of said side frame is made of a light reflective material.

16 . The backlight module according to claim 1 , wherein said first microstructure unit includes a matte surface.

17 . The backlight module according to claim 1 , wherein said first microstructure unit includes a plurality of first microstructures having a V-shaped cross-section and having height-over-width ratios that decrease as a distance to said surrounding side of said light guide plate increases.

18 . The backlight module according to claim 1 , wherein said first microstructure unit is disposed to be covered by said quantum dot enhancement film.

19 . A display device comprising:
said backlight module of claim 1 ; a plurality of optical films that are stacked on said light guide plate; and a liquid crystal panel that is stacked on said optical films opposite to said light guide plate.

Assignees

• Radiant Opto-Electronics (Suzhou) Co Ltd
• Radiant Opto Electronics Corp

Inventors

• Lai Chun-Hau
• Chen Wei-Hsuan

Classifications

• G02B6/005

  provided by one optical element, or plurality thereof, placed on the light output side of the light guide · CPC title

• G02B6/0036 Primary

  2-D arrangement of prisms, protrusions, indentations or roughened surfaces · CPC title

• G02B6/0053 Primary

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

• G02B6/0035

  provided on the surface of the light guide or in the bulk of it · CPC title

• G02B6/0031

  Reflecting element, sheet or layer · CPC title