Optical member and method for manufacturing same, backlight unit using the optical member, and method for manufacturing the backlight unit

Patent metadata

Field	Value
Publication number	US-9447946-B2
Application number	US-201113881119-A
Country	US
Kind code	B2
Filing date	Aug 30, 2011
Priority date	Nov 10, 2010
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

The present invention relates to an optical member, comprising: a light incidence surface; and a light-emitting surface which comprises a patterned portion intended for adjusting the intensity of light and formed at an area corresponding to a light source, and an adhesive portion disposed in an area other than the patterned portion. When the optical member of the present invention is applied to a backlight unit, the patterned portion, which diffuses the light from the light source, is formed in the area corresponding to the light source so as to effectively diffuse the light from the light source into the peripheral area. Also, the optical member and a diffusion plate are stacked via an air layer in the area corresponding to the light source (the area in which the patterned portion is disposed), and the optical member and the diffusion plate closely contact each other without an air layer in the remaining area, such that the intensity of the light transmitted between a light source portion and the peripheral portion may be adjusted with an improvement in the balance of brightness and uniformity.

First claim

The invention claimed is:

1. An optical member comprising:
a light incident side;
a light outgoing side comprising a pattern part in an area corresponding to a light source and an adhesive part in an area aside from that of the pattern part, the pattern part configured to adjust the intensity of a light, the pattern part formed of a non-adhesive ink; and
a spacer formed on the pattern part and having a pillar structure in order to maintain a predetermined distance between the pattern part and a film stacked thereon,
wherein the spacer is formed by overlapping and patterning an ultraviolet curing ink or a phase change ink;
wherein the pattern part includes a diffusion pattern formed on an entire area of the pattern part and a reflective pattern formed over the diffusion pattern,
wherein the diffusion pattern is formed of a non-adhesive ink comprising at least one selected from the group consisting of titanium dioxide, Teflon, polystyrene, and silica, and
wherein the reflective pattern is formed of a non-adhesive ink comprising at least one selected from the group consisting of Al, Cr, Ag, Hg, Pt, and Mo.

2. The optical member of claim 1 , wherein the pattern part is formed through an inkjet method.

3. A backlight unit comprising:
a light source;
the optical member of claim 1 ; and
an optical film stacked on a light outgoing side of the optical member.

4. The backlight unit of claim 3 , wherein an air layer is formed between a pattern part of the optical member and the optical film; and
an adhesive part of the optical member and the optical film contact each other with no air layer.

5. A display device comprising the backlight unit of claim 4 .

6. A method of manufacturing an optical member including operations of:
(a) forming an adhesive part on a light outgoing side of an optical member;
(b) forming a non-adhesive pattern part using a non-adhesive ink to adjust the intensity of light in an area corresponding to a light source in the light outgoing side of the optical member; and
(c) forming a spacer on the pattern part having a pillar structure in order to maintain a predetermined interval between a portion of the pattern part of (b) and a film stacked thereon,
wherein the spacer is formed by overlapping and patterning an ultraviolet curing ink or a phase change ink,
wherein the pattern part includes a diffusion pattern formed on an entire area of the pattern part and a reflective pattern formed over the diffusion pattern,
wherein the diffusion pattern is formed of a non-adhesive ink comprising at least one selected from the group consisting of titanium dioxide, Teflon, polystyrene, and silica, and
wherein the reflective pattern is formed of a non-adhesive ink comprising at least one selected from the group consisting of Al, Cr, Ag, Hg, Pt, and Mo.

7. A method of manufacturing a backlight unit comprising laminating an optical film for diffusion on the optical member manufactured through the method of claim 6 .

Assignees

• Kim Joon-Hyung
• Lg Chemical Ltd

Inventors

• Kim Joon-Hyung

Classifications

• F21V11/00 Primary

  Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 (characterised by cooling arrangements F21V29/502) · CPC title

• G02F1/133606 Primary

  including a specially adapted diffusing, scattering or light controlling members · CPC title

• Y10T156/10

  Methods of surface bonding and/or assembly therefor · CPC title

• G02F1/133611

  including means for improving the brightness uniformity · CPC title

• F21V7/00

  Reflectors for light sources (characterised by cooling arrangements F21V29/505) · CPC title