Optical member, display device, and light emitting device having the same

Patent metadata

Field	Value
Publication number	US-9733413-B2
Application number	US-201214241751-A
Country	US
Kind code	B2
Filing date	Jul 4, 2012
Priority date	Aug 31, 2011
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

Disclosed are an optical member and a display device. The display device includes a light source; a light conversion layer to convert a wavelength of light emitted from the light source; and a display panel into which the light is incident from the light conversion layer, wherein the light conversion layer includes a plurality of concave surfaces.

First claim

The invention claimed is:

1. A display device comprising:
a display panel;
a light guide plate having an upper surface facing the display panel, a bottom surface and side surfaces;
a light source including a plurality of light emitting diodes and being disposed laterally to the light guide plate to emit light into at least one side surface of the light guide plate;
a reflective sheet disposed below the light guide plate to reflect the light upward as the light is output downward from the bottom surface of the light guide plate;
a light conversion layer interposed between the light guide plate and the display panel and including a host and a plurality of quantum dots in the host to convert a wavelength of the light guided by the light guide plate upwards toward the display panel;
a lower substrate having an upper surface supporting the light conversion layer, a bottom surface, and side surfaces, the lower substrate having a concavo-convex pattern formed on the upper surface and including convex parts and concave parts between the convex parts and including polyethyleneterephthalate (PET); and
an upper substrate having a flat upper surface, a flat bottom surface, and side surfaces and including PET,
wherein the light conversion layer includes a concavo-convex surface corresponding to the concavo-convex pattern of the lower substrate to have a concave surface and a convex surface.

2. The display device of claim 1 , wherein the convex parts have an embossing shape.

3. The display device of claim 1 , wherein the convex parts have a diameter in a range of about 1 μm to about 1 mm.

4. The display device of claim 1 , wherein thicknesses of the light conversion layer covering the convex parts and the concave parts are different from each other.

5. The display device of claim 1 , wherein the flat bottom surface of the upper substrate directly contacts the light conversion layer.

6. The display device of claim 1 , wherein the convex parts of the lower substrate directly contact the light conversion layer.

7. The display device of claim 1 , wherein the light conversion layer extends continuously over the convex parts and the concave parts of the lower substrate.

8. The display device of claim 1 , wherein each of the concavo-convex pattern includes an inclined surface inclined with respect to a bottom surface of the lower substrate.

9. The display device of claim 1 , further comprising:
at least one prism sheet disposed on the upper surface of the light guide plate.

10. The display device of claim 1 , wherein the wavelength of light is converted over a length of the concavo-convex surface including the concave surface and the convex surface, and
wherein the convex parts of the lower substrate have a diameter in a range of about 1 μm to about 1 mm.

11. The display device of claim 1 , further comprising:
at least one oxide layer disposed on the upper substrate.

Assignees

• Park Soung Kyu
• Lg Innotek Co Ltd

Inventors

• Park Soung Kyu

Classifications

• G02B6/0053 Primary

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

• G02B6/0058

  varying in density, size, shape or depth along the light guide · CPC title

• G02F1/133606

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

• F21K9/64

  using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer · CPC title

• G02B6/005

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