Image quality improving film and preparation method thereof, display panel and display device

• US 10,571,731 B2
• Filed: 04/20/2017
• Issued: 02/25/2020
• Est. Priority Date: 04/21/2016
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Kashima, Miki
• Primary Examiner(s): Crockett, Ryan
• Application Number:
  US15/576,618
• Publication Number:
  US 20180164633A1
• Time in Patent Office: 1,041 Days
• Field of Search: None
• CPC Class Codes: G02F 1/133365 Cells in which the active layer comprises a liquid crystalline polymer
• CPC Class Codes: G02F 1/133388 with constructional differences between the display region and the peripheral region
• CPC Class Codes: G02F 1/1334 based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
• CPC Class Codes: G02F 1/133504 Diffusing, scattering, diffracting elements associated to illuminating devices G02F1/133606
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/137 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
• CPC Class Codes: G02F 1/13756 the liquid crystal selectively assuming a light-scattering state G02F1/1334, G02F1/13718 take precedence
• CPC Class Codes: G02F 2202/023 curable
• CPC Class Codes: G02F 2202/043 pleochroic

Abstract

Disclosed is an image quality improving film and a preparation method thereof, a display panel and a display device. The image quality improving film includes a scattering layer for covering a pixel region of a display layer to scatter a light coming from the display layer. By attaching the image quality improving film to image-displaying side of the display layer in the display panel and covering the pixel region of the display layer with the scattering layer, the scattering layer of the image quality improving film can scatter a light coming from the display layer, thereby increasing the viewing angle of the display panel.

Claims

1. An image quality improving film to be attached to image-displaying side of a display layer in a display panel, wherein, the image quality improving film comprises:

a first substrate;

a second substrate; and

a scattering layer, disposed between the first substrate and the second substrate, for covering a pixel region of a display layer to scatter a light coming from the display layer,

wherein, the image quality improving film further comprises a liquid crystal polymer wall, a first transparent conductive layer and a second transparent conductive layer, wherein the liquid crystal polymer wall is positioned between the first substrate and the second substrate and outside the scattering layer, wherein an inner lateral face of the liquid crystal polymer wall is attached to an outer lateral face of the scattering layer, and the liquid crystal polymer wall is switchable between a transparent state and an opaque state;

the first transparent conductive layer is positioned between the liquid crystal polymer wall and the first substrate, and the second transparent conductive layer is positioned between the liquid crystal polymer wall and the second substrate.

2. The image quality improving film according to claim 1, wherein, the material of the liquid crystal polymer wall is a polymer of a dichroic dye, a liquid crystal, a polymerizable monomer and a photo-initiator.

3. The image quality improving film according to claim 2, wherein, the liquid crystal is a nematic liquid crystal.

4. The image quality improving film according to claim 2, wherein, the polymerizable monomer is an acrylic monomer.

5. The image quality improving film according to claim 1, wherein, the liquid crystal polymer wall is positioned around the scattering layer, or the liquid crystal polymer wall is positioned outside two opposite lateral sides of the scattering layer.

6. The image quality improving film according to claim 1, wherein, the material of the scattering layer is a polymer of a liquid crystal, a polymerizable monomer and a photo-initiator.

7. A display panel comprising the image quality improving film according to claim 1, wherein the image quality improving film is attached to image-displaying side of a display layer in the display panel, and the scattering layer of the image quality improving film covers a pixel region of the display layer.

8. A display device, wherein, the display device comprises the display panel according to claim 7.

9. A preparation method of an image quality improving film to be attached to image-displaying side of a display layer in a display panel, wherein, the preparation method of an image quality improving film comprises the following step:

forming a scattering layer for covering a pixel region of a display to scatter a light coming from the display layer, on a first substrate; and

fixing a second substrate onto the scattering layer,

wherein, before fixing the second substrate onto the scattering layer, the preparation method of an image quality improving film further comprises;

forming a first transparent conductive layer on the first substrate, the first transparent conductive layer being positioned outside the scattering layer, and an inner lateral face of the first transparent conductive layer being attached to an outer lateral face of the scattering layer;

forming a second transparent conductive layer on the second substrate, the second transparent conductive layer having the same pattern as that of the first transparent conductive layer, and an orthographic projection on the first substrate of the second transparent conductive layer coinciding with that of the first transparent conductive layer; and

forming a liquid crystal polymer wall on the second transparent conductive layer, the liquid crystal polymer wall covering the second transparent conductive layer.

10. The preparation method of an image quality improving film according to claim 9, wherein, said forming a scattering layer on a first substrate comprises:

mixing a liquid crystal, a polymerizable monomer and a photo-initiator for preparing the scattering layer in the following mass percentages;

the liquid crystal;

70%-80% by mass, the polymerizable monomer;

19%-29.5% by mass, and the photo-initiator;

0.3%-1% by mass of the polymerizable monomer;

applying the mixed materials for preparing the scattering layer onto the first substrate, and polymerizing and curing the materials to form the scattering layer.

11. The preparation method of an image quality improving film according to claim 10, wherein, said polymerizing and curing the materials to form the scattering layer is performed by irradiating with UV light.

12. The preparation method of an image quality improving film according to claim 9, wherein, said forming a liquid crystal polymer wall on the second transparent conductive layer comprises:

mixing a dichroic dye, a liquid crystal, a polymerizable monomer and a photo-initiator for preparing the liquid crystal polymer wall in the following mass percentages;

the dichroic dye;

0.5%-1% by mass, the liquid crystal;

70%-80% by mass, the polymerizable monomer;

19%-29.5% by mass, and the photo-initiator;

0.3%-1% by mass of the polymerizable monomer;

applying the mixed materials for preparing the liquid crystal polymer wall onto the second transparent conductive layer, and polymerizing and curing the materials to form the liquid crystal polymer wall.

13. The preparation method of an image quality improving film according to claim 12, wherein, said polymerizing and curing the materials to form the liquid crystal polymer wall is performed by irradiating with UV light.

14. The preparation method of an image quality improving film according to claim 9, wherein, the first transparent conductive layer being positioned outside the scattering layer comprises:

the first transparent conductive layer being positioned around the scattering layer, or the first transparent conductive layer is positioned outside two opposite lateral sides of the scattering layer.