Linear polarizing layer, circular polarizing layer, flexible display apparatus, and preparation methods thereof

Patent metadata

Field	Value
Publication number	US-10505151-B2
Application number	US-201715544934-A
Country	US
Kind code	B2
Filing date	Jan 24, 2017
Priority date	May 30, 2016
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

This invention discloses a linear polarizing layer, a circular polarizing layer, a flexible display apparatus, and preparation methods thereof. The preparation method of a linear polarizing layer according to this invention comprises the steps of: coating a polarizing film precursor material on a flexible base material, wherein the polarizing film precursor material comprises a polarizing material capable of being oriented under a field effect; orientating the polarizing film precursor material in a manner of field induction to allow the direction of orientation thereof to be vertical to the direction of a bending axis of the flexible base material; and curing the polarizing film precursor material to form a linear polarizing layer on the flexible base material.

First claim

What is claimed is:

1. A preparation method of a linear polarizing layer, comprising the steps of:
coating a polarizing film precursor material on a first flexible base material, wherein the polarizing film precursor material comprises a polarizing material capable of being oriented under a field effect;
orientating the polarizing film precursor material by field induction to allow a direction of orientation of the polarizing film precursor material to be vertical to a direction of a bending axis of the first flexible base material when the first flexible base material is bent; and
curing the oriented polarizing film precursor material to form a linear polarizing layer on the first flexible base material.

2. The preparation method of a linear polarizing layer according to claim 1 , wherein the polarizing material comprises a dichroic dye, a dispersion solvent, and a polymerizable active monomer.

3. The preparation method of a linear polarizing layer according to claim 2 , wherein the polymerizable active monomer is oriented and polymerized under field induction to form a polymer chain compound after polymerization, and the direction of the polymer chain segments of the polymer chain compound is vertical to the direction of the bending axis of the first flexible base material, so that the dichroic dye included among the polymer chain compound is oriented in the direction vertical to the bending axis of the first flexible base material.

4. The preparation method of a linear polarizing layer according to claim 2 , wherein the polymerizable active monomer is a vinyl ether cationic monomer.

5. The preparation method of a linear polarizing layer according to claim 2 , wherein the field induction comprises:
electric field induction, wherein an electric field having a direction vertical to the direction of the bending axis of the first flexible base material is applied at the area of the linear polarizing layer; or
magnetic field induction, wherein a magnetic field having a direction vertical to the direction of the bending axis of the first flexible base material is applied at the area of the linear polarizing layer; or
light orientation field induction, wherein a light orientation field having a direction vertical to the direction of the bending axis of the first flexible base material is applied at the area of the linear polarizing layer.

6. The preparation method of a linear polarizing layer according to claim 2 , wherein the dichroic dye comprises anthraquinone dyes or azo dyes.

7. The preparation method of a linear polarizing layer according to claim 6 , wherein the dichroic dye comprises anthraquinone dyes or azo dyes having a light-absorbing group in a long axis direction of a dye molecule in the anthraquinone dyes or the azo dyes.

8. The preparation method of a linear polarizing layer according to claim 2 , wherein the dispersion solvent comprises a small-molecule nematic liquid crystal for dispersing the dichroic dye.

9. The preparation method of a linear polarizing layer according to claim 2 , wherein the content of the dichroic dye is between 0.2% and 20%, the content of the dispersion solvent is between 50% and 80%, and the content of the polymerizable active monomer is between 0.05% and 5%, based on the total weight of the polarizing film precursor material.

10. A linear polarizing layer, which is prepared by the preparation method according to claim 1 .

11. The linear polarizing layer according to claim 10 , wherein the linear polarizing layer has a thickness between 5 μm and 40 μm.

12. A preparation method of a circular polarizing layer, comprising the steps of:
preparing a phase retardation film on a flexible substrate to form a second flexible base material; and
preparing a linear polarizing layer on the second flexible base material according the preparation method of claim 1 to form a circular polarizing layer comprising a phase retardation film and a linear polarizing layer.

13. The preparation method of a circular polarizing layer according to claim 12 , wherein said preparing a phase retardation film on a flexible substrate comprises the steps of:
coating a phase retardation material on a flexible substrate, wherein the phase retardation material comprises a polarizing material capable of being oriented under a field effect;
orientating the phase retardation material by field induction to allow the direction of orientation of the phase retardation material to be vertical to the direction of a bending axis of the flexible substrate; and
curing the oriented phase retardation material to form a phase retardation film on the flexible substrate.

14. The preparation method of a circular polarizing layer according to claim 13 , wherein the manner of field induction, which makes the phase retardation material oriented, is:
electric field induction, wherein an electric field having a direction vertical to the direction of the bending axis of the flexible substrate is applied at the area of the phase retardation film; or
magnetic field induction, wherein a magnetic field having a direction vertical to the direction of the bending axis of the flexible substrate is applied at the area of the phase retardation film; or
light orientation field induction, wherein a light orientation field having a direction vertical to the direction of the bending axis of the flexible substrate is applied at the area of the phase retardation film.

15. The preparation method of a circular polarizing layer according to claim 13 , wherein said curing the oriented phase retardation material comprises the step of curing the oriented phase retardation material in a manner of photocuring or thermocuring.

16. A circular polarizing layer, which is prepared by the preparation method according to claim 12 .

17. The circular polarizing layer according to claim 16 , wherein the circular polarizing layer has a thickness between 10 μm and 60 μm.

18. A preparation method of a flexible display apparatus, comprising the steps of:
forming an organic light-emitting layer on a flexible material and performing thin-film encapsulation to form a flexible substrate; and
preparing a circular polarizing layer on the flexible substrate according to the preparation method of claim 12 .

19. A flexible display apparatus, which is prepared by the preparation method according to claim 18 .

20. The linear polarizing layer according to claim 10 , wherein the field induction includes:
electric field induction, wherein an electric field having a direction vertical to the direction of the bending axis of the first flexible base material is applied at the area of the linear polarizing layer; or
magnetic field induction, wherein a magnetic field having a direction vertical to the direction of the bending axis of the first flexible base material is applied at the area of the linear polarizing layer; or
light orientation field induction, wherein a light orientation field having a direction vertical to the direction of the bending axis of the first flexible base material is applied at the area of the linear polarizing layer.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Wang Tao
• Tsai Pao Ming

Classifications

• G09F9/33

  being semiconductor devices, e.g. diodes · CPC title

• C08K5/30

  Hydrazones; Semicarbazones · CPC title

• G02B5/3016

  involving passive liquid crystal elements (optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528) · CPC title

• G02B5/3083 Primary

  Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001) · CPC title

• C08K5/45

  Heterocyclic compounds having sulfur in the ring · CPC title