Color filter substrate, manufacturing method thereof, and display device

Patent metadata

Field	Value
Publication number	US-11397347-B2
Application number	US-201916452792-A
Country	US
Kind code	B2
Filing date	Jun 26, 2019
Priority date	Jul 24, 2018
Publication date	Jul 26, 2022
Grant date	Jul 26, 2022

Abstract

A color filter substrate, a manufacturing method thereof and a display device are disclosed. The color filter substrate includes a base substrate and a plurality of filter units located on the base substrate. Each filter unit includes a photonic crystal layer configured to transmit light of one color, and includes a first photonic crystal sub-layer and a second photonic crystal sub-layer that are stacked in a direction perpendicular to the base substrate.

First claim

What is claimed is:

1. A color filter substrate, comprising:
a base substrate, and
a plurality of filter units located on the base substrate, each of the plurality of filter units comprising a photonic crystal layer configured to transmit light of one color and comprising a first photonic crystal sub-layer and a second photonic crystal sub-layer that are stacked in a direction perpendicular to the base substrate,
wherein the plurality of filter units comprise a first filter unit, a second filter unit, and a third filter unit,
the photonic crystal layer of the first filter unit is configured to transmit light of a first color, the photonic crystal layer of the second filter unit is configured to transmit light of a second color, and the photonic crystal layer of the third filter unit is configured to transmit light of a third color;
the first photonic crystal sub-layer and the second photonic crystal sub-layer of the first filter unit are a photonic crystal sub-layer with a photonic band gap at a wavelength band of the light of the third color and a photonic crystal sub-layer with a photonic band gap at a wavelength band of the light of the second color, respectively; the first photonic crystal sub-layer and the second photonic crystal sub-layer of the second filter unit are a photonic crystal sub-layer with a photonic band gap at the wavelength band of the light of the third color and a photonic crystal sub-layer with a photonic band gap at a wavelength band of the light of the first color, respectively; and the first photonic crystal sub-layer and the second photonic crystal sub-layer of the third filter unit are a photonic crystal sub-layer with the photonic band gap at the wavelength band of the light of the first color and the photonic band gap at the wavelength band of the light of the second color, respectively,
wherein at least one selected from the group consisting of the first filter unit, the second filter unit, and the third filter unit further comprises a quantum dot photoluminescence layer located on the photonic crystal layer, the quantum dot photoluminescence layer is configured to be excited to generate light of the same color as light transmitted by the photonic crystal layer located in a region where the quantum dot photoluminescence layer is located,
wherein a color of one selected from the group consisting of the light of the first color, the light of the second color, and the light of the third color is the same as a color of irradiation light irradiated to the color filter substrate.

2. The color filter substrate according to claim 1 , wherein the photonic crystal layer is consisted of the first photonic crystal sub-layer and the second photonic crystal sub-layer.

3. A color filter substrate, comprising:
a base substrate, and
a plurality of filter units located on the base substrate, each of the plurality of filter units comprising a photonic crystal layer configured to transmit light of one color and comprising a first photonic crystal sub-layer and a second photonic crystal sub-layer that are stacked in a direction perpendicular to the base substrate,
wherein the plurality of filter units comprise a first filter unit, a second filter unit, and a third filter unit,
the photonic crystal layer of the first filter unit is configured to transmit light of a first color, the photonic crystal layer of the second filter unit is configured to transmit light of a second color, and the photonic crystal layer of the third filter unit is configured to transmit light of a third color;
the first photonic crystal sub-layer and the second photonic crystal sub-layer of the first filter unit are a photonic crystal sub-layer with a photonic band gap at a wavelength band of the light of the third color and a photonic crystal sub-layer with a photonic band gap at a wavelength band of the light of the second color, respectively; the first photonic crystal sub-layer and the second photonic crystal sub-layer of the second filter unit are a photonic crystal sub-layer with a photonic band gap at the wavelength band of the light of the third color and a photonic crystal sub-layer with a photonic band gap at a wavelength band of the light of the first color, respectively; and the first photonic crystal sub-layer and the second photonic crystal sub-layer of the third filter unit are a photonic crystal sub-layer with the photonic band gap at the wavelength band of the light of the first color and the photonic band gap at the wavelength band of the light of the second color, respectively,
wherein two first photonic crystal sub-layers of adjacent filter units with different photonic band gaps have first side surfaces opposite to each other, each of the first side surfaces has a sawtooth structure, and the two first photonic crystal sub-layers of the adjacent filter units are meshed with each other through the first side surfaces; two second photonic crystal sub-layers of adjacent filter units with different photonic band gaps have second side surfaces opposite to each other, each of the second side surfaces has a sawtooth structure, and the two second photonic crystal sub-layers of the adjacent filter units are meshed with each other through the second side surfaces, and
wherein at an intersection of adjacent filter units, the sawtooth structure of the first side surface of each of the two first photonic crystal sub-layers is overlapped with the sawtooth structure of the second side surface of each of the two second photonic crystal sub-layers so that a stacked portion configured to reflect the light of the first color, the light of the second color, and the light of the third color so as to be served as a black matrix is provided.

4. The color filter substrate according to claim 1 , wherein the light of the first color, the light of the second color, and the light of the third color constitute three primary colors.

5. The color filter substrate according to claim 1 , wherein two of the first photonic crystal sub-layer of the first filter unit, the first photonic crystal sub-layer of the second filter unit, and the first photonic crystal sub-layer of the third filter unit are configured to reflect light of a same color; and the first photonic crystal sub-layer of the first filter unit, the first photonic crystal sub-layer of the second filter unit, and the first photonic crystal sub-layer of the third filter unit are located at a same layer;
two of the second photonic crystal sub-layer of the first filter unit, the second photonic crystal sub-layer of the second filter unit, and the second photonic crystal sub-layer of the third filter unit are configured to reflect light of a same color; and the second photonic crystal sub-layer of the first filter unit, the second photonic crystal sub-layer of the second filter unit, and the second photonic crystal sub-layer of the third filter unit are located at a same layer.

6. The color filter substrate according to claim 1 , wherein two first photonic crystal sub-layers of adjacent filter units with different photonic band gaps have first side surfaces opposite to each other, each of the first side surfaces has a sawtooth structure, and the two first photonic crystal sub-layers of the adjacent filter units are meshed with each other through the first side surfaces; two second photonic crystal sub-layers of adjacent filter units with different photonic band gaps have second side surfaces opposite to each other, each of the second side surfaces has a sawtooth structure, and the two second photonic crystal sub-layers of the adjacent filter units are meshed with each other through the second side surfaces.

7. The color filter substrate according to claim 1 , wherein the photonic crystal sub-layer with the photonic band gap at the wavelength band of the

Assignees

• Beijing Boe Display Tech Co
• Boe Technology Group Co Ltd

Inventors

• Wang Lin
• Song Yongzhi
• Wang Ruirui
• Chen Huabin
• Li Xingliang
• Liu Yang
• Gao Yingqiang

Classifications

• G02B5/20 Primary

  Filters (polarising elements G02B5/30) · CPC title

• G02F2202/36

  Micro- or nanomaterials · CPC title

• G02F1/133516 Primary

  Methods for their manufacture, e.g. printing, electro-deposition or photolithography · CPC title

• G02B1/005

  made of photonic crystals or photonic band gap materials (photonic band-gap structures or photonic lattices in integrated optics G02B6/1225; photonic band-gap structures or photonic lattices in optical fibres G02B6/02295) · CPC title

• G02F2202/32

  Photonic crystals · CPC title