Backlight unit and liquid crystal display including the same

Patent metadata

Field	Value
Publication number	US-2016109635-A1
Application number	US-201514669464-A
Country	US
Kind code	A1
Filing date	Mar 26, 2015
Priority date	Oct 16, 2014
Publication date	Apr 21, 2016
Grant date	—

Abstract

A backlight unit including a light guide plate (LGP), a light source module disposed adjacent to an incident surface of the LGP and configured to irradiate light to the incident surface, and a light control member disposed between the light source module and the incident surface, in which the light control member includes a reflection preventing layer disposed adjacent to the light source module and configured to prevent reflection of light, a base substrate disposed on the reflection preventing layer and configured to scatter or diffuse light transmitted through the reflection preventing layer, and a light adjusting filter disposed on the base substrate and configured to filter light including a first wavelength among light provided by the light source module.

First claim

What is claimed is:

1 . A backlight unit, comprising:
a light guide plate (LGP); a light source module disposed adjacent to an incident surface of the LGP and configured to irradiate light to the incident surface; and a light control member disposed between the light source module and the incident surface, wherein the light control member comprises: a reflection preventing layer disposed adjacent to the light source module and configured to prevent reflection of light; a base substrate disposed on the reflection preventing layer and configured to scatter or diffuse light transmitted through the reflection preventing layer; and a light adjusting filter disposed on the base substrate and configured to filter light comprising a first wavelength among light provided by the light source module.

2 . The backlight unit of claim 1 , wherein the light control member comprises:
a reflection preventing layer disposed adjacent to the light source module; a base substrate disposed adjacent to the LGP; and a light adjusting filter disposed between the reflection preventing layer and the base substrate.

3 . The backlight unit of claim 1 , wherein the light control member further comprises an adhesive layer contacting the light source module and the incident surface of the LGP.

4 . The backlight unit of claim 1 , wherein the reflection preventing layer comprises a reflectivity in a range of 0.1% to 1%.

5 . The backlight unit of claim 1 , wherein the base substrate further comprises diffuser beads.

6 . The backlight unit of claim 1 , wherein the base substrate comprises layers having different refractive indices from each other and disposed on the reflection preventing layer.

7 . The backlight unit of claim 1 , wherein:
the base substrate comprises layers having different refractive indices from each other; and the layers are disposed on the reflection preventing layer such that the refractive indices of the layers gradually increase in a direction from the light source module towards the LGP.

8 . The backlight unit of claim 7 , wherein a first layer of the layers disposed adjacent to the LGP comprises a refractive index substantially equal to a refractive index of the LGP or different from the refractive index of the LGP by less than 0.1.

9 . The backlight unit of claim 1 , wherein the base substrate comprises glass, quartz, polymethyl methacrylate (PMMA), or polycarbonate (PC).

10 . The backlight unit of claim 1 , wherein the light adjusting filter is configured to minimize transmittance of light comprising the first wavelength.

11 . The backlight unit of claim 1 , wherein the light adjusting filter comprises a reflective mirror configured to reflect the first wavelength or an absorption filter configured to absorb the first wavelength.

12 . The backlight unit of claim 1 , wherein the light adjusting filter is configured to absorb or reflect light having the first wavelength in a range of 470 nm to 510 nm.

13 . The backlight unit of claim 1 , wherein the light adjusting filter is configured to absorb or reflect light having the first wavelength in a range of 560 nm to 610 nm.

14 . The backlight unit of claim 1 , further comprising:
a lower housing comprising a bottom plate, sidewalls protruding upward from the bottom plate, and a top plate partially protruding from the sidewalls to be parallel to the bottom plate; and a reflective sheet disposed between the LGP and the lower housing, wherein: the bottom plate of the lower housing comprises a space for housing the LGP, the light control member, and the light source module; and wherein the light source module comprises a printed circuit board (PCB) and light source packages.

15 . The backlight unit of claim 14 , wherein the light control member is disposed on the PCB.

16 . The backlight unit of claim 14 , wherein the light control member is disposed on the lower housing.

17 . The backlight unit of claim 14 , wherein the PCB comprises:
a mounting surface on which the light source packages are disposed; and a resting surface opposite to the mounting surface and disposed on a sidewall or the bottom plate of the lower housing.

18 . A backlight unit, comprising:
a light source module comprising a front surface configured to radiate light; a light guide plate (LGP) comprising an incident surface upon which the light radiated from the front surface of the light source module is configured to be incident; and a light control member disposed between the front surface of the light source module and the incident surface of the LGP, wherein the light control member contacts the front surface of the light source module and the incident surface of the LGP.

19 . The backlight unit of clam 18 , wherein:
the light control member comprises a reflection preventing layer, a base substrate, and a light adjusting filter; the reflection preventing layer contacts the front surface of the light source module; and the light adjusting filter or the base substrate contacts the incident surface of the LGP.

20 . A liquid crystal display (LCD), comprising:
a backlight unit comprising a light guide plate (LGP), a light source module disposed adjacent to an incident surface of the LGP and configured to irradiate light to the incident surface, and a light control member disposed between the light source module and the incident surface; and a liquid crystal panel disposed on the LGP, wherein the light control member comprises: a reflection preventing layer disposed adjacent to the light source module and configured to prevent reflection of light; a base substrate disposed on the reflection preventing layer and configured to scatter or diffuse light transmitted through the reflection preventing layer; and a light adjusting filter disposed on the base substrate and configured to filter light comprising a first wavelength among light provided by the light source module.

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Sang Hyuk
• Kim Jung Kyun
• Byun Sang Chul
• Son Young Hye

Classifications

• G02B6/0083

  Details of electrical connections of light sources to drivers, circuit boards, or the like · CPC title

• G02F1/133504

  Diffusing, scattering, diffracting elements (associated to illuminating devices G02F1/133606) · CPC title

• G02F1/133509

  Filters, e.g. light shielding masks · CPC title

• G02B6/0026 Primary

  Wavelength selective element, sheet or layer, e.g. filter or grating · CPC title

• G02B6/0031

  Reflecting element, sheet or layer · CPC title