Quantum dot display apparatus and manufacturing method thereof

• US 10,338,428 B2
• Filed: 12/21/2015
• Issued: 07/02/2019
• Est. Priority Date: 09/24/2015
• Status: Active Grant

• Current Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Liu, Guohe
• Primary Examiner(s): Strah, Eli D.
• Application Number:
  US14/917,274
• Publication Number:
  US 20170255056A1
• Time in Patent Office: 1,289 Days
• CPC Class Codes: B32B 2457/202 LCD, i.e. liquid crystal displays
• CPC Class Codes: C09K 2323/00 Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
• CPC Class Codes: C09K 2323/03 Viewing layer characterised by chemical composition
• CPC Class Codes: C09K 2323/035 Ester polymer, e.g. polycarbonate, polyacrylate or polyester
• CPC Class Codes: G02B 5/201 in the form of arrays
• CPC Class Codes: G02B 5/206 comprising particles embedded in a solid matrix
• CPC Class Codes: G02B 5/207 comprising semiconducting materials
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133516 Methods for their manufacture, e.g. printing, electro-deposition or photolithography
• CPC Class Codes: G02F 1/133519 Overcoatings
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133567 on the back side
• CPC Class Codes: G02F 1/133614 using photoluminescence, e.g. phosphors illuminated by UV or blue light
• CPC Class Codes: G02F 1/133617 Illumination with ultraviolet light; Luminescent elements or materials associated to the cell
• CPC Class Codes: G02F 1/133621 providing coloured light G02F1/133617, G02F1/133533 take precedence
• CPC Class Codes: G02F 1/1337 Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
• CPC Class Codes: G02F 2201/50 Protective arrangements
• CPC Class Codes: G02F 2202/10 semiconductor
• CPC Class Codes: G02F 2202/36 Micro- or nanomaterials
• CPC Class Codes: H01L 27/14621 : Colour filter arrangements
• CPC Class Codes: H10K 59/38 : comprising colour filters or colour changing media [CCM]

Abstract

The present disclosure provides a quantum dot display apparatus. By adding quantum dot display technology of the present disclosure can provide sophisticated quantum dot patterns in the color filter layer and have higher resolution, color saturation and color gamut of the display apparatus, the well structure and manufacture is simple. The disclosure also provides a manufacturing method of a quantum dot display apparatus, the methods includes exposure, coating, developing process of the existing color filter to contain the surface modified red and green quantum dot resin composition with more sophisticated patterns, and making high resolution, color saturation and color gamut quantum dot display apparatus, the material preparation and fabrication process of this manufacturing method is simple, less waste of materials, low production cost, suitable for mass production.

Claims

1. A manufacturing method of a quantum dot display apparatus, comprising the following steps:

Step 1;

a lower substrate is provided, and a black matrix is formed on the lower substrate;

Step 2;

a quantum dot resin composition is coated on the lower substrate between the black matrix, pre-baking the lower substrate coated with the quantum dot resin composition to remove an organic solvent in the quantum dot resin composition;

Step 3;

a red photoresist is applied on the quantum dot resin composition and the black matrix, excess red photoresist and excess quantum dot resin composition are removed by prebaking, exposing, and developing processes to bake and form a red sub-pixel region comprising a red photoresist layer and a first quantum dot resin composition layer disposed below the red photoresist layer;

Step 4;

the quantum dot resin composition is further coated between the black matrix on the lower substrate, pre-baking the lower substrate coated with the quantum dot resin composition to remove the organic solvent in the quantum dot resin composition;

Step 5;

a green photoresist is applied on the quantum dot resin composition and the black matrix, excess green photoresist and excess quantum dot resin composition are removed by prebaking, exposing, and developing processes to bake and form a green sub-pixel region comprising a green photoresist layer and a second quantum dot resin composition layer disposed below the green photoresist layer;

Step 6;

a transparent organic photoresist is coated on the lower substrate and the black matrix to form a blue sub-pixel region, thus forming a color filter layer;

Step 7;

a rear polarizing layer is set on the color filter layer, a lower alignment layer is formed on the polarizing layer, to finish the formation of a color filter substrate; and

Step 8;

an array substrate is provided, and the color filter substrate and the array substrate are paired, a liquid crystal is filled to form a liquid crystal layer, a blue light backlight module is disposed in a bottom of the color filter substrate to produce the quantum dot display apparatus;

wherein in the steps 2 and 4, the quantum dot resin composition comprising surface modified red quantum dots, surface modified green quantum dots, alkali-soluble resins, solvents and dispersants;

wherein the material of the surface modified red quantum dots, surface modified green quantum dots comprising one or more than one material selected from the material of the II-VI family of semiconductor nano-materials, III-V family of semiconductor nano-materials, and IV-VI family of semiconductor nano-materials;

the alkali-soluble resin comprising styrene-maleic anhydride copolymer or aromatic acid (meth) acrylate half ester;

the solvent comprising one or more than one material selected from the material of formic acid, acetic acid, chloroform, acetone, butanone, fatty alcohols, ethylene glycol monomethyl ether, ethylene glycol monomethyl ether, ethylene glycol monomethyl ether, ethylene glycol monomethyl ether, diethylene glycol diethyl ether, ethyl acetate, methyl ethyl ketone, methyl isobutyl ketone, ethylene glycol monomethyl ether, γ

-butyrolactone, 3-ether acetate propionate, butyl carbitol, butyl carbitol, acetate, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, cyclohexane, xylene, and isopropyl alcohol; and

the dispersant may be selected from amide-based polymer, modified polyurethane, modified polyacrylate, and silicone surfactant.

2. The manufacturing method of a quantum dot display apparatus according to claim 1, wherein in the steps 2 and 4 the thickness of the first and the second quantum dot resin composition layer is 1 μ

m-200 μ

m and the prebaking temperature is 100°

C. −

150°

C.

3. The manufacturing method of a quantum dot display apparatus according to claim 1, wherein the array substrate comprising:

an upper substrate, an upper alignment layer formed in the upper substrate of the surface faced to the lower substrate, and an upper polarizer layer formed on the upper substrate wherein the upper polarizer layer is provided on the surface faced to the lower substrate, or provided between the upper substrate and the upper alignment layer.