Display apparatus

Patent metadata

Field	Value
Publication number	US-2016103267-A1
Application number	US-201514747468-A
Country	US
Kind code	A1
Filing date	Jun 23, 2015
Priority date	Oct 14, 2014
Publication date	Apr 14, 2016
Grant date	—

Abstract

A display apparatus includes a display panel and a backlight unit. The backlight unit includes a light source emitting a first color light, a light guide member, quantum dots, and a dichroic filter preventing the first color light from being leaked.

First claim

What is claimed is:

1 . A display apparatus comprising:
a display panel; and a backlight unit disposed under the display panel to provide a display light to the display panel, the backlight unit comprising: a light source emitting a first color light; a light guide member comprising a light output surface, an opposite surface facing the light output surface, a light incident surface connecting the light output surface and the opposite surface and facing the light source, and a connection surface connecting the light output surface, the opposite surface, and the light incident surface to guide the first color light incident through the light incident surface to the display panel; a quantum dot sheet disposed on the light guide member to convert the first color light emitting from the light output surface to the display light; and a first dichroic filter facing the connection surface to prevent the first color light incident to the light guide member from being leaked.

2 . The display apparatus of claim 1 , wherein the quantum dot sheet comprises:
first quantum dots each having a size to absorb the first color light and emit a second color light; and second quantum dots each having a size to absorb the first color light and emit a third color light.

3 . The display apparatus of claim 2 , wherein the display light is a white light in which the first, second, and third color lights are mixed with each other.

4 . The display apparatus of claim 2 , wherein the first color light is a blue light, the second color light is a red light, and the third color light is a green light.

5 . The display apparatus of claim 2 , wherein the first dichroic filter reflects the first color light and transmits the second and third color lights.

6 . The display apparatus of claim 1 , further comprising a second dichroic filter facing the opposite surface.

7 . The display apparatus of claim 1 , further comprising a third dichroic filter disposed at at least an edge of the quantum dot sheet.

8 . The display apparatus of claim 1 , wherein the quantum dot sheet covers at least a portion of the light output surface.

9 . A display apparatus comprising:
a display panel; and a backlight unit disposed under the display panel to provide a display light to the display panel, the backlight unit comprising: a light source emitting a first color light; a light guide member comprising a light output surface, an opposite surface facing the light output surface, a light incident surface connecting the light output surface and the opposite surface and facing the light source, and a connection surface connecting the light output surface, the opposite surface, and the light incident surface; a quantum dot tube disposed between the light source and the light guide member to convert the first color light to the display light; and a first dichroic filter disposed on the quantum dot tube to prevent the first color light from being leaked.

10 . The display apparatus of claim 9 , wherein the quantum dot tube comprises:
a glass tube; and a plurality of quantum dots injected into the glass tube, some of the quantum dots absorb the first color light to emit a second color light, and the others of the quantum dots absorb the first color light to emit a third color light.

11 . The display apparatus of claim 10 , wherein the first color light is a blue light, the second color light is a red light, and the third color light is a green light.

12 . The display apparatus of claim 10 , wherein the glass tube extends in one direction and has a ring shape when viewed from a cross-sectional view substantially perpendicular to the direction in which the glass tube extends.

13 . The display apparatus of claim 12 , wherein the glass tube comprises:
a first portion facing the light source, to which the first color light is incident; a second portion facing the light incident surface, from which the display light emits; a third portion connecting an upper portion of the first portion and an upper portion of the second portion; and a fourth portion connecting a lower portion of the first portion and a lower portion of the second portion.

14 . The display apparatus of claim 13 , wherein the first dichroic filter is disposed on an upper surface of the third portion.

15 . The display apparatus of claim 13 , further comprising a second dichroic filter disposed on a lower surface of the fourth portion.

Assignees

• Samsung Display Co Ltd

Inventors

• An Jae Sul
• Kim Donghoon

Classifications

• G02B6/0023 Primary

  provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source · CPC title

• G02F1/133524

  Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides · CPC title

• G02B6/005

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

• G02F1/133615 Primary

  Edge-illuminating devices, i.e. illuminating from the side · CPC title

• G02B6/0026

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