Viewing angle varying film and display device comprising the same

Patent metadata

Field	Value
Publication number	US-12422706-B2
Application number	US-202418799691-A
Country	US
Kind code	B2
Filing date	Aug 9, 2024
Priority date	Oct 24, 2023
Publication date	Sep 23, 2025
Grant date	Sep 23, 2025

Abstract

Provided is a viewing angle varying film. The viewing angle varying film includes a first film, a second film that overlaps the first film and is spaced apart from the first film, a first electrode on the first film, a second electrode on the second film, and a viewing angle varying layer between the first electrode and the second electrode. The viewing angle varying layer includes a plurality of first structures and a plurality of second structures including colored particles and are spaced apart from each other. At least one or more of a height, a width, and a shape of the plurality of first structures and the plurality of second structures is different. Accordingly, various viewing field characteristics may be satisfied.

First claim

What is claimed is:

1. A viewing angle varying film, comprising:
a first film;
a second film that overlaps the first film and is spaced apart from the first film;
a first electrode on the first film;
a second electrode on the second film such that the second electrode is between the second film and the first electrode; and
a viewing angle varying layer between the first electrode and the second electrode, the viewing angle varying layer including a plurality of first structures and a plurality of second structures that are spaced apart from each other and each of the plurality of first structures and each of the plurality of second structures including colored particles,
wherein at least one or more of a height, a width, or a shape of a first structure from the plurality of first structures is respectively different from a height, a width, or a shape of a second structure from the plurality of second structures.

2. The viewing angle varying film according to claim 1 , wherein the plurality of first structures and the plurality of second structures are alternately disposed.

3. The viewing angle varying film according to claim 2 , wherein the first electrode overlaps the plurality of first structures and the plurality of second structures, and the second electrode includes:
a plurality of first sub electrodes that overlap the plurality of first structures without overlapping the plurality of second structures; and
a plurality of second sub electrodes that overlap the plurality of second structures without overlapping the plurality of first structures.

4. The viewing angle varying film according to claim 3 , further comprising:
a plurality of lenses on the second film such that the second film is between the plurality of lenses and the second electrode,
wherein a refractive index of the plurality of lenses is in a range from 1.4 to 1.7, and a center of each of the plurality of lenses is aligned with a space between a corresponding first sub electrode from the plurality of first sub electrodes and a corresponding second sub electrode from the plurality of second sub electrodes that is adjacent to the corresponding first sub electrode.

5. The viewing angle varying film according to claim 1 , wherein the colored particles have a first alignment direction while a voltage is not applied to the first electrode and the second electrode and the colored particles have a second alignment direction that is different from the first alignment direction while the voltage is applied to the first electrode and the second electrode.

6. The viewing angle varying film according to claim 1 , wherein each of the plurality of first structures and each of the plurality of second structures have a rectangular cross-section, a width of each of the plurality of first structures is a same as a width of each of the plurality of second structures, and a length of each of the plurality of first structures is different from a length of each of the plurality of second structures.

7. The viewing angle varying film according to claim 6 , wherein the viewing angle varying layer further comprises:
a plurality of third structures including colored particles, the plurality of third structures spaced apart from the plurality of first structures and the plurality of second structures,
wherein each of the plurality of third structures has a rectangular cross-section, and each of the plurality of third structures has a width that is a same as the width of each of the plurality of first structures and the width of each of the plurality of second structures, and has a height that is different from the height of each of the plurality of first structures and the height of each of the plurality of second structures.

8. The viewing angle varying film according to claim 1 , wherein each of the plurality of first structures and each of the plurality of second structures have a rectangular cross-section, a height of each of the plurality of first structures is a same as a height of each of the plurality of second structures, and a width of each of the plurality of first structures is different from a width of each of the plurality of second structures.

9. The viewing angle varying film according to claim 8 , wherein the viewing angle varying layer further comprises:
a plurality of third structures including colored particles, the plurality of third structures spaced apart from the plurality of first structures and the plurality of second structures,
wherein each of the plurality of third structures has a rectangular cross-section, and a height of each of the plurality of third structures is a same as a height of each of the plurality of first structures and a height of each of the plurality of second structures, and a width of each of the plurality of third structures is different from a width of each of the plurality of first structures and a width of each of the plurality of second structures.

10. The viewing angle varying film according to claim 1 , wherein one of the plurality of first structures and the plurality of second structures has a rectangular cross-section and the other one of the plurality of first structures and the plurality of second structures has a trapezoidal cross-section, and a height of each of the plurality of first structures is a same as a height of each of the plurality of second structures.

11. The viewing angle varying film according to claim 1 , wherein one of the plurality of first structures and the plurality of second structures has a rectangular cross-section and the other one of the plurality of first structures and the plurality of second structures has a trapezoidal cross-section, and a height of the one of the plurality of first structures and the plurality of second structures having the rectangular cross-section is less than a height of the other one structure of the plurality of first structures and the plurality of second structures having the trapezoidal cross-section.

12. The viewing angle varying film according to claim 1 , wherein each of the plurality of first structures and the plurality of second structures have a trapezoidal cross-section,
wherein a first side surface of each of the plurality of first structures is vertical with respect to a bottom surface of each of the plurality of first structures, a first side surface of each of the plurality of second structures is vertical with respect to a bottom surface of each of the plurality of second structures, a second side surface of each of the plurality of first structures is inclined with respect to the bottom surface of each of the plurality of first structures and a second side surface of each of the plurality of second structures is inclined with respect to the bottom surface of each of the plurality of second structures.

13. The viewing angle varying film according to claim 12 , wherein the inclined second side surface of a first structure from the plurality of first structures and the inclined second side surface of a second structure of the plurality of second structures are opposite to each other.

14. The viewing angle varying film according to claim 12 , wherein a shape of the plurality of first structures and a shape of the plurality of second structures are symmetrical to each other.

15. The viewing angle varying film according to claim 12 , wherein the inclined second side surface of a first structure from the plurality of first structures is opposite to the vertical first side surface of a second structure from the plurality of second structures, and the inclined second side surface of the second structure is opposite to the vertical first side surfac

Assignees

• Lg Display Co Ltd

Inventors

• Han Jaejung
• Yoon Hyukjoon
• Lee Semin
• Gwon Seungju

Classifications

• G02F1/133769

  comprising an active, e.g. switchable, alignment layer · CPC title

• G02F1/133524

  Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides · CPC title

• G02F1/133603

  with LEDs · CPC title

• G02F1/133504

  Diffusing, scattering, diffracting elements (associated to illuminating devices G02F1/133606) · CPC title

• G02F1/134363 Primary

  for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS] · CPC title