Display module and preparation method

Patent metadata

Field	Value
Publication number	US-12153303-B2
Application number	US-202218026233-A
Country	US
Kind code	B2
Filing date	Jun 30, 2022
Priority date	Jun 30, 2022
Publication date	Nov 26, 2024
Grant date	Nov 26, 2024

Abstract

The anti-dazzle component included in the display module includes an anti-dazzle module, a selective reflecting sheet and a first phase-difference film; the selective reflecting sheet is overlaid on a first surface of the display component, and the first phase-difference film is arranged between the anti-dazzle module and the selective reflecting sheet, the anti-dazzle module is configured to pass through a first polarized light or a second polarized light, a polarization vector of the first polarized light is located in a plane formed by an incident light and a corresponding reflected light, and a polarization vector of the second polarized light is perpendicular to the plane; and a polarization direction of a light reflected by the selective reflecting sheet is the same as that of a light passing through the first phase-difference film, and is opposite to that of a light passing through the selective reflecting sheet.

First claim

The invention claimed is:

1. A display module, comprising: a display component and an anti-dazzle component,
wherein the anti-dazzle component comprises: an anti-dazzle module, a selective reflecting sheet and a first phase-difference film;
the selective reflecting sheet is overlaid on a first surface of the display component, and the first phase-difference film is arranged between the anti-dazzle module and the selective reflecting sheet, wherein a first light-filtering sheet is overlaid on the first surface of the display component, the first light-filtering sheet is configured to convert a light emitted by the display component into a linearly-polarized light, the anti-dazzle module is configured to pass through a first polarized light or a second polarized light, a polarization vector of the first polarized light is located in a plane formed by an incident light and a corresponding reflected light thereof, and a polarization vector of the second polarized light is perpendicular to a plane formed by an incident light and a corresponding reflected light thereof; and
a polarization direction of a light reflected by the selective reflecting sheet is the same as that of a light passing through the first phase-difference film, and a polarization direction of a light reflected by the selective reflecting sheet is opposite to that of a light passing through the selective reflecting sheet.

2. The display module according to claim 1 , wherein a second phase-difference film is further arranged between the selective reflecting sheet and the first surface of the display component, and the second phase-difference film is configured to convert a light into a circularly-polarized light.

3. The display module according to claim 1 , wherein the light passing through the selective reflecting sheet is a right-handed circularly-polarized light, and the light reflected by the selective reflecting sheet is a left-handed circularly-polarized light.

4. The display module according to claim 1 , wherein the light passing through the selective reflecting sheet is a left-handed circularly-polarized light, and the light reflected by the selective reflecting sheet is a right-handed circularly-polarized light.

5. The display module according to claim 1 , wherein the anti-dazzle module comprises a first transparent substrate, a second transparent substrate and a liquid-crystal cell, and
the liquid-crystal cell is arranged between the first transparent substrate and the second transparent substrate, and the first phase-difference film is overlaid under the second transparent substrate.

6. The display module according to claim 5 , further comprising a second optical light-filtering sheet, and
the second light-filtering sheet is overlaid on the first transparent substrate, and is configured to convert an ambient light into a linearly-polarized light.

7. The display module according to claim 6 , wherein, in a condition that an electric field is formed between the first transparent substrate and the second transparent substrate, liquid-crystal molecules in the liquid-crystal cell are arranged in a second direction, and the linearly-polarized light transmitted from the second light-filtering sheet passes through the liquid-crystal cell, to form the second polarized light,
in a condition that no electric field presents between the first transparent substrate and the second transparent substrate, the liquid-crystal molecules in the liquid-crystal cell are arranged in a first direction, and the linearly-polarized light transmitted from the second light-filtering sheet passes through the liquid-crystal cell, to form the first polarized light, and
an electric-field direction of the first electric field is from the first transparent substrate to the second transparent substrate, the second direction is the same as the electric-field direction of the electric field, and the second direction and the first direction are perpendicular to each other.

8. The display module according to claim 1 , wherein the selective reflecting sheet comprises a liquid-crystal layer and a polyester resin substrate,
a first surface of the liquid-crystal layer is overlaid on the polyester resin substrate, and a second surface of the liquid-crystal layer contacts the first phase-difference film, and
liquid-crystal molecules in the liquid-crystal layer are a cholesteric liquid crystal, the liquid-crystal molecules are arranged in parallel in the liquid crystal layer, and corresponding liquid-crystal molecules of two adjacent layers are arranged in a helical rotation along a direction, wherein the direction is a normal direction of a plane at which the liquid-crystal layer is located.

9. The display module according to claim 1 , wherein the first phase-difference film is a quarter-wave plate.

10. A preparation method for preparing the selective reflecting sheet and the first phase-difference film comprised in the display module according to claim 1 , wherein the preparation method comprises:
obtaining a substrate, wherein the substrate is a release substrate;
coating a photoalignment agent on the substrate, to form an alignment layer;
coating a polymerizable nematic liquid crystal on the alignment layer, to form the first phase-difference film;
preparing the selective reflecting sheet; and
overlaying the first phase-difference film on a first surface of the selective reflecting sheet.

11. The preparation method according to claim 10 , wherein the display module further comprises a second phase-difference film, configured to convert a light into a circularly-polarized light, and, after the overlaying the first phase-difference film on the first surface of the selective reflecting sheet, the method further comprises:
overlaying the second phase-difference film under a second surface of the selective reflecting sheet, wherein the first surface and the first surface are two opposite surfaces of the selective reflecting sheet.

12. The preparation method according to claim 10 , wherein the preparing the selective reflecting sheet comprises:
obtaining a polyester resin substrate;
blade-coating a liquid-crystal-mixed liquid on the polyester resin substrate at least twice;
drying the polyester resin substrate coated with the liquid-crystal-mixed liquid, to evaporate a solvent in the liquid-crystal-mixed liquid, so as to form a first liquid-crystal film layer on the polyester resin substrate;
placing the polyester resin substrate formed with the first liquid-crystal film layer under an ultraviolet-light lamp for radiation crosslinking, to perform ultraviolet-light curing on the first liquid-crystal film layer, so as to form a second liquid-crystal film layer on the polyester resin substrate;
determining whether the second liquid-crystal film layer meets a full-band coverage of the display component, and
in response to that the second liquid-crystal film layer does not meet the full-band coverage of the display component, continuing blade-coating the liquid-crystal-mixed liquid on the formed second liquid-crystal film layer, to form the first liquid-crystal film layer, and to further form a subsequent second liquid-crystal film layer, until a finally-formed second liquid-crystal film layer meets the full-band coverage of the display component, wherein a finally-formed selective reflecting sheet is a sum of a plurality of the second liquid-crystal film layers.

13. The preparation method according to claim 12 , wherein the solvent in the liquid-crystal-mixed liquid is a cyclopentanone solvent.

14. The preparation method according to claim 12 , wherein the drying the polyester resin substrate coated

Assignees

• Beijing Boe Technology Dev Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Li Wenbo

Classifications

• G02F1/13718

  based on a change of the texture state of a cholesteric liquid crystal · CPC title

• G02F1/133788

  by light irradiation, e.g. linearly polarised light photo-polymerisation · CPC title

• G02F1/133541

  Circular polarisers · CPC title

• G02F1/133638

  Waveplates, i.e. plates with a retardation value of lambda/n · CPC title

• G02F1/1335

  Structural association of cells with optical devices, e.g. polarisers or reflectors · CPC title