Display device having quantum dot

Patent metadata

Field	Value
Publication number	US-10495805-B2
Application number	US-201715407619-A
Country	US
Kind code	B2
Filing date	Jan 17, 2017
Priority date	Jul 14, 2016
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

Disclosed is a quantum dot display device including a light emitting unit configured to generate a light; and a color conversion unit configured to convert the light generated from the light emitting unit to a color light. The color conversion unit includes a quantum dot portion configured to convert the light to the color light; a bridge portion configured to provide a color conversion path of the light passing the quantum dot portion and to vertically guide the light; and a prism portion configured to guide the light passing the bridge portion to an outside. The above configuration may enhance the light efficiency by providing a sufficient color conversion path of light.

First claim

What is claimed is:

1. A quantum dot display device comprising:
a light emitting unit configured to generate a light; and
a color conversion unit configured to convert the light generated from the light emitting unit to a color light,
wherein the color conversion unit comprises:
a quantum dot portion configured to convert the light to the color light;
a bridge portion configured to provide a color conversion path of the light passing the quantum dot portion and to vertically guide the light; and
a prism portion configured to guide the light passing the bridge portion to an outside,
wherein the bridge portion comprises a sheet in which a plurality of bridge areas for vertically guiding the light corresponding to an angle of total reflection and a plurality of air gaps for providing the color conversion path of the light are alternately disposed in parallel with each other and stacked on the quantum dot portion,
wherein the plurality of bridge areas have a wall extending in the vertical direction so as to be adjacent to the air gaps and extending vertically between the quantum dot portion and the prism portion,
wherein the light passing through the wall is refracted in the vertical direction,
wherein if a height of a bridge area of the plurality of bridge areas is H, a width of the bridge area has a value of H×tan 50°, and
wherein a width of an air gap of the plurality of air gaps has a length corresponding to eight to ten folds relative to a width of the bridge area.

2. The quantum dot display device of claim 1 , wherein the light emitting unit comprises:
a light source configured to generate the light;
a guide layer provided to face the light source and configured to guide the light to the color conversion unit; and
a reflective layer provided to face the color conversion unit based on the guide layer, and configured to reflect the light toward the color conversion unit.

3. The quantum dot display device of claim 2 , wherein the light source comprises a light emitting diode (LED).

4. The quantum dot display device of claim 1 , wherein the quantum dot portion comprises:
a quantum dot layer configured to include a plurality of quantum dots for converting the light to the color light; and
a single pair of barrier layers stacked on a top and a bottom of the quantum dot layer based on a heading direction of the light, and configured to protect the quantum dot layer.

5. The quantum dot display device of claim 1 , wherein the prism portion comprises a prism sheet in a shape of an unevenness or a pyramid having a slope, and stacked on the bridge portion.

6. The quantum dot display device of claim 1 , wherein the quantum dot portion, the bridge portion, and the prism portion are formed as a module through mutual coupling.

7. A quantum dot display device comprising:
a light emitting unit configured to generate a light; and
a color conversion unit configured to convert the light generated from the light emitting unit to a color light,
wherein the color conversion unit comprises:
a quantum dot layer configured to include a plurality of quantum dots for converting the light to a plurality of color lights;
a bridge layer in which a plurality of bridge areas for vertically guiding the light passing the quantum dot layer and a plurality of air gaps for providing a color conversion path of the light are alternately disposed, and stacked on the quantum dot layer to couple therewith; and
a prism layer stacked on the bridge layer to guide the light to an outside and to couple therewith,
wherein the plurality or bridge areas have a wall extending in the vertical direction so as to be adjacent to the air gaps and extending vertically between the quantum dot layer and the prism layer,
wherein the light passing through the wall is refracted in the vertical direction,
wherein if a height of a bridge area of the plurality of bridge areas is H, a width of the bridge area has a value of H×tan 50°, and
wherein a width of an air gap of the plurality of air gaps has a length corresponding to eight to ten folds relative to a width of a bridge area of the plurality of bridge areas.

8. The quantum dot display device of claim 7 , wherein the light emitting unit comprises:
a light source comprising a light emitting diode (LED), and configured to generate the light;
a guide layer provided to face the light source and configured to guide the light to the color conversion unit; and
a reflective layer provided to face the color conversion unit based on the guide layer, and configured to reflect the light toward the color conversion unit.

9. The quantum dot display device of claim 7 , wherein a single pair of barrier layers are stacked on a top and a bottom of the quantum dot layer based on a heading direction of the light, and configured to protect the quantum dot layer.

Assignees

• Univ Yonsei Iacf

Inventors

• Kim Young Joo
• Kim Se Eun
• Lee Jae Yong
• Shin Min Ho
• Kim Hyo Jun

Classifications

• G02B6/0229 Primary

  characterised by nanostructures, i.e. structures of size less than 100 nm, e.g. quantum dots · CPC title

• G02B6/0053

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

• G02B6/005 Primary

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

• G02B5/223

  containing organic substances, e.g. dyes, inks or pigments · CPC title

• G02B6/0065

  Manufacturing aspects; Material aspects · CPC title