Wire grid polarizer and manufacturing method thereof, and display device

• US 10,042,099 B2
• Filed: 05/07/2015
• Issued: 08/07/2018
• Est. Priority Date: 12/30/2014
• Status: Expired due to Fees

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Li, Yingyi
• Primary Examiner(s): Tallman, Robert E
• Application Number:
  US14/893,703
• Publication Number:
  US 20160341861A1
• Time in Patent Office: 1,188 Days
• Field of Search: 35948501, 35948503, 35948505
• CPC Class Codes: B29D 11/00644 polarizing
• CPC Class Codes: B29K 2033/04 Polymers of esters
• CPC Class Codes: B29K 2105/0002 monomers or prepolymers
• CPC Class Codes: G02B 5/3058 comprising electrically conductive elements, e.g. wire grids, conductive particles

Abstract

Disclosed are a wire grid polarizer and a manufacturing method thereof, and a display device, which relate to the display technical field. The problem of high production cost in a manufacture process of a wire grid polarizer can be solved. The manufacturing method of the wire grid polarizer includes: coating a first polymer monomer on the surface of the base substrate; subjecting the first polymer monomer corresponding to the first preset position to a curing treatment; forming a pattern of first protrusions with intervals on the surface of the base substrate; coating a mixture of the second polymer monomer and metal particles on the surface of the substrate provided with the first protrusions; subjecting the mixture corresponding to the second preset position to a curing treatment; forming a pattern of wire grid formed of the second protrusions with intervals on the surface of the base substrate; wherein each second protrusion covers at least one surface for polarization of one first protrusion.

Claims

1. A wire grid polarizer, comprising:

a base substrate;

first protrusions disposed on a surface of the base substrate with intervals being provided between the first protrusions, the first protrusions being formed of a first resin material; and

second protrusions disposed on the surface of the base substrate with intervals being provided between the second protrusions, the second protrusions being formed of a second resin material doped with metal particles and forming a pattern of wire grid;

wherein each second protrusion covers an upper surface and a lateral surface of one first protrusion, a bottom end of each second protrusion is in direct contact with the base substrate, and bottom ends of adjacent second protrusions are spaced from each other; and

a width of a top end of each second protrusion along an arrangement direction of the second protrusions is greater than a distance normal to the base substrate from the top end of the second protrusion to the base substrate between adjacent ones of the first protrusions.

2. The wire grid polarizer according to claim 1, wherein the first resin material or the second resin material comprises an acrylic polymer;

and the metal particles are formed of one or more selected from the group consisting of elementary substance iron, elementary substance copper and elementary substance aluminum.

3. The wire grid polarizer according to claim 1, wherein

the second protrusions are arranged at a period of less than or equal to 100 nm.

4. The wire grid polarizer according to claim 1, wherein

each of the second protrusions has a width of less than or equal to 50 nm.

5. The wire grid polarizer according to claim 1, wherein

a sum of a thickness of the first protrusions and a thickness of the second protrusions is 20 nm to 100 nm.

6. The wire grid polarizer according to claim 1, wherein

a material for forming the base substrate comprises at least one selected from the group consisting of glass and quartz, or at least one selected from the group consisting of polyethylene glycol terephthalate and cellulose triacetate.

7. A display device, comprising a wire grid polarizer according to claim 1.

8. A method for manufacturing a wire grid polarizer, wherein

the method comprises:

coating a layer of a first polymer monomer on a surface of a base substrate;

subjecting the layer of the first polymer monomer at a position corresponding to first protrusions to a curing treatment;

forming a pattern of the first protrusions on the surface of the base substrate with intervals being provided between the first protrusions;

coating a layer of a mixture of a second polymer monomer and metal particles on the surface of the substrate provided with the first protrusions;

subjecting the mixture at a position corresponding to second protrusions to a curing treatment; and

forming a pattern of wire grid formed of the second protrusions on the surface of the base substrate with intervals being provided between the second protrusions, so that each second protrusion covers an upper surface and a lateral surface of one first protrusion, a bottom end of each second protrusion is in direct contact with the base substrate, and bottom ends of adjacent second protrusions are spaced from each other; and

a width of a top end of each second protrusion along an arrangement direction of the second protrusions is greater than a distance normal to the base substrate from the top end of the second protrusion to the base substrate between adjacent ones of the first protrusions.

9. The method for manufacturing the wire grid polarizer according to claim 8, wherein forming of the first protrusions after coating the layer of the first polymer monomer on the surface of the base substrate comprises:

disposing a first mask plate on a surface of the layer of the first polymer monomer, and exposing a position of the layer of the first polymer monomer corresponding to a transparent area of the first mask plate; and

removing the layer of the first polymer monomer corresponding to a shielding area of the first mask plate.

10. The method for manufacturing the wire grid polarizer according to claim 8, wherein forming of the first protrusions after coating the layer of the first polymer monomer on the surface of the base substrate comprises:

stamping a first stamping die into the layer of the first polymer monomer to contact the stamping die with the base substrate;

exposing the first polymer monomer in the first stamping die; and

separating the first stamping die from the first polymer monomer subjected to exposure and the base substrate.

11. The method for manufacturing the wire grid polarizer according to claim 9, wherein forming the second protrusions after coating the layer of the mixture of the second polymer monomer and metal particles on the surface of the substrate provided with the first protrusions comprises:

disposing a second mask plate on a surface of the mixture, and exposing a position of the mixture corresponding to a transparent area of the second mask plate;

wherein a width of the transparent area of the second mask plate is greater than a width of the transparent area of the first mask plate;

or the width of the transparent area of the second mask plate is greater than a width of the groove of the first stamping die; and

removing the mixture corresponding to a shielding area of the second mask plate.

12. The method for manufacturing the wire grid polarizer according to claim 9, wherein forming of the second protrusion after coating the layer of the mixture of the second polymer monomer and metal particles on the surface of the substrate provided with the first protrusions comprises:

stamping a second stamping die into the layer of the mixture to contact the stamping die with the base substrate, wherein a width of the groove of the second stamping die is greater than a width of the transparent area of the first mask plate, or the width of the groove of the second stamping die is greater than a width of the groove of the first stamping die;

exposing the mixture in the second stamping die; and

separating the second stamping die from the mixture subjected to exposure and the base substrate.

13. The method for manufacturing the wire grid polarizer according to claim 12, wherein at least one of the first stamping die and the second stamping die is formed of a transparent material.

14. The method for manufacturing the wire grid polarizer according to claim 8, wherein a material for forming the first polymer monomer or the second polymer monomer comprises an acrylic monomer;

and the metal particles are formed of one or more selected from the group consisting of elementary substance iron, elementary substance copper and elementary substance aluminum.

15. The method for manufacturing the wire grid polarizer according to claim 8, wherein

the second protrusions are arranged at a period of less than or equal to 100 nm.

16. The method for manufacturing the wire grid polarizer according to claim 8, wherein

each of the second protrusions has a width of less than or equal to 50 nm.

17. The method for manufacturing the wire grid polarizer according to claim 8, wherein

a sum of a thickness of the layer of the first polymer monomer and a thickness of the layer of the mixture is 20 nm-100 nm.

18. The method for manufacturing the wire grid polarizer according to claim 8, wherein

a material for forming the base substrate comprises at least one selected from the group consisting of glass and quartz, or at least one selected from the group consisting of polyethylene glycol terephthalate and cellulose triacetate.

19. The method for manufacturing the wire grid polarizer according to claim 8, wherein

a sum of a thickness of the first protrusion and a thickness of the second protrusion is 20 nm to 100 nm.

20. A wire grid polarizer, comprising:

a base substrate;

first protrusions disposed on a surface of the base substrate with intervals being provided between the first protrusions, the first protrusions being formed of a first resin material; and

second protrusions disposed on the surface of the base substrate with intervals being provided between the second protrusions, the second protrusions being formed of a second resin material doped with metal particles and forming a pattern of wire grid;

wherein each of the second protrusions covers at least one surface for polarization of the first protrusions, bottom ends of outer lateral walls of adjacent second protrusions contact the base substrate directly and are spaced from each other, and a height of an outer lateral wall of each second protrusion is greater than a height of an outer lateral wall of each first protrusion; and

a width of a top end of each second protrusion along an arrangement direction of the second protrusions is greater than a distance normal to the base substrate from the top end of the second protrusion to the base substrate between adjacent ones of the first protrusions.