Quantum rod film

Patent metadata

Field	Value
Publication number	US-9874668-B2
Application number	US-201615007174-A
Country	US
Kind code	B2
Filing date	Jan 26, 2016
Priority date	May 13, 2015
Publication date	Jan 23, 2018
Grant date	Jan 23, 2018

Abstract

A quantum rod film for a backlight unit of a liquid crystal display is disclosed herein. The quantum rod film includes a first barrier layer, a sub-wavelength microstructure on the first barrier layer, and a plurality of quantum rods, wherein the sub-wavelength microstructure includes gratings aligned in a parallel direction, an alignment microstructure disposed in grooves between the gratings in a direction perpendicular to the gratings, and a reflective layer on upper surfaces of the gratings. A plurality of quantum rods are arranged in the alignment microstructure of the sub-wavelength microstructure, and major axes of the quantum rods are aligned in a direction perpendicular to the gratings.

First claim

What is claimed is:

1. A quantum rod film, comprising:
a first barrier layer disposed at a side receiving light incident from a backlight source;
a sub-wavelength microstructure disposed on the first barrier layer, wherein the sub-wave length microstructure comprises gratings aligned in a parallel direction, an alignment microstructure disposed in grooves between the gratings in a direction perpendicular to the gratings, and a reflective layer on upper surfaces of the gratings; and
a plurality of quantum rods arranged in the alignment microstructure of the sub-wavelength microstructure, wherein major axes of the quantum rods are aligned in a direction perpendicular to the gratings.

2. The quantum rod film of claim 1 , wherein each grating of the sub-wavelength microstructure has a width ranging from 70 nm to 75 nm, a depth ranging from 50 nm to 200 nm and a pitch between each grating ranging from 70 nm to 75 nm.

3. The quantum rod film of claim 1 , wherein the alignment microstructure has a width ranging from 5 nm to 20 nm, a depth ranging from 5 nm to 50 nm, and a pitch between each alignment microstructure ranging from 5 nm to 20 nm.

4. The quantum rod film of claim 1 , wherein the quantum rods have a length ranging from 10 nm to 50 nm, and an aspect ratio ranging from 5 to 10.

5. The quantum rod film of claim 1 , wherein the quantum rods comprise quantum rods with same lengths or different lengths.

6. The quantum rod film of claim 1 , wherein a material of the quantum rods is a semiconductor material selected from the group consisting of group III-V, group II-VI, group IV-VI compounds and a combination thereof.

7. The quantum rod film of claim 1 , wherein a material of the first barrier layer is a material selected from the group consisted of polyethylene terephthalate, polymethyl methacrylate, cyclo-olefin polymer, polysiloxanes, fluororesin polymer, or metal oxide-containing organic/inorganic composite film.

8. The quantum rod film of claim 1 , wherein the reflective layer of the sub-wavelength microstructure is a metallic layer.

9. The quantum rod film of claim 1 , further comprising a second barrier disposed on the sub-wavelength microstructure.

10. The quantum rod film of claim 9 , wherein a material of the second barrier is a material selected from the group consisted of polyethylene terephthalate, polymethyl methacrylate, cyclo-olefin polymer, polysiloxanes, fluororesin polymer, or metal oxide-containing organic/inorganic composite film.

Assignees

• Benq Materials Corp

Inventors

• Wu Jian-Hung
• Chao Shih-Wei

Classifications

• G02F2202/36

  Micro- or nanomaterials · CPC title

• G02F2201/30

  grating · CPC title

• G02F1/13362

  providing polarized light, e.g. by converting a polarisation component into another one · CPC title

• G02F1/133609

  including means for improving the color mixing, e.g. white · CPC title

• G02B5/1819

  Plural gratings positioned on the same surface, e.g. array of gratings (plural diffractive elements positioned sequentially along the optical path G02B27/4272) · CPC title