Light directing film

Patent metadata

Field	Value
Publication number	US-9366875-B2
Application number	US-201514729029-A
Country	US
Kind code	B2
Filing date	Jun 2, 2015
Priority date	Jun 9, 2005
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

The present invention discloses a light directing film comprising a first structured major surface, a second major surface opposite to the first structured major surface and a reference plane between the first structured major surface and the second major surface, wherein the reference plane is substantially perpendicular to the thickness direction of the light directing film, wherein the first structured major surface comprises a first prism element and a second prism element extending substantially in a first direction, wherein a first ridge of the first prism element has a first height relative to the reference plane and a second ridge of the second prism element has a second height relative to the reference plane, wherein the first height of the first ridge of the first prism element varies along the first direction. Preferably, the maximum of the first height is larger than the maximum of the second height.

First claim

What is claimed is:

1. A light directing film comprising a first structured major surface, a second major surface opposite to the first structured major surface and a reference plane between the first structured major surface and the second major surface, wherein the reference plane is substantially perpendicular to the thickness direction of the light directing film, wherein the first structured major surface comprises a first prism element and a second prism element extending substantially in a first direction, wherein a first ridge of the first prism element has a first height relative to the reference plane and a second ridge of the second prism element has a second height relative to the reference plane, wherein the first height of the first ridge of the first prism element varies along the first direction and the second height of the second ridge of the second prism element varies along the first direction, wherein the maximum of the first height is larger than the maximum of the second height and the minimum of the first height is less than the maximum of the second height.

2. The light directing film according to claim 1 , wherein a first portion of the first prism element having the minimum of the first height has a first bottom width and a second portion of the first prism element having the maximum of the first height has a second bottom width, wherein the second bottom width is larger than the first bottom width.

3. The light directing film according to claim 1 , wherein a first portion of the first prism element having the minimum of the first height has a first cross-sectional shape and a second portion of the first prism element having the maximum of the first height has a second cross-sectional shape, wherein each edge of the second cross-sectional shape is respectively enlarged from a corresponding edge of the first cross-sectional shape by a ratio larger than 1.

4. A light directing film comprising a first structured major surface, a second major surface opposite to the first structured major surface and a reference plane between the first structured major surface and the second major surface, wherein the reference plane is substantially perpendicular to the thickness direction of the light directing film, wherein the first structured major surface comprises a first prism element and a second prism element extending substantially in a first direction, wherein a first ridge of the first prism element has a first height relative to the reference plane and a second ridge of the second prism element has a second height relative to the reference plane, wherein the first ridge of the first prism element comprises a first peak point and a first valley point, and the second ridge of the second prism element comprises a second peak point, wherein the second height of the second peak point is smaller than the first height of the first peak point and larger than the first height of the first valley point.

5. The light directing film according to claim 4 , wherein the first prism element and the second prism element are disposed along a second direction substantially perpendicular to the first direction.

6. The light directing film according to claim 5 , wherein the first prism element is adjacent to the second prism element.

7. The light directing film according to claim 5 , wherein the first peak point and the first valley point are located in a first portion of the first ridge of the first prism element, and the second peak point is located in a second portion of the second ridge of the second prism element, wherein the first portion and the second portion are disposed along a second direction substantially perpendicular to the first direction.

8. The light directing film according to claim 4 , wherein the first prism element and the second prism element are disposed along a second direction substantially perpendicular to the first direction, and the first prism element is adjacent to the second prism element, wherein the first peak point and the first valley point are located in a first portion of the first ridge of the first prism element, and the second peak point is located in a second portion of the second ridge of the second prism element, wherein the first portion and the second portion are disposed along the second direction.

9. A light directing film comprising a first structured major surface, a second major surface opposite to the first structured major surface and a reference plane between the first structured major surface and the second major surface, wherein the reference plane is substantially perpendicular to the thickness direction of the light directing film, wherein the first structured major surface comprises a first prism and a second prism extending substantially in a first direction, wherein a first ridge of the first prism has a first height relative to the reference plane and a second ridge of the second prism has a second height relative to the reference plane, wherein the first ridge of the first prism comprises a first portion comprising a first elevating portion and a first non-elevating portion adjoining the first elevating portion along the first direction, and the second ridge of the second prism comprises a second portion comprising a second elevating portion, wherein the maximum of the first height of the first elevating portion is larger than the maximum of the second height of the second elevating portion, and the minimum of the first height of the first non-elevating portion is less than the maximum of the second height of the second elevating portion.

10. The light directing film according to claim 9 , wherein the first prism and the second prism are disposed along a second direction substantially perpendicular to the first direction.

11. The light directing film according to claim 10 , wherein the first prism is adjacent to the second prism.

12. The light directing film according to claim 10 , wherein the first portion and the second portion are disposed along a second direction substantially perpendicular to the first direction.

13. The light directing film according to claim 9 , wherein the first prism and the second prism are disposed along a second direction substantially perpendicular to the first direction, the first prism is adjacent to the second prism and the first portion and the second portion are disposed along the second direction.

14. The light directing film according to claim 13 , wherein the first height of the first non-elevating portion has a constant value.

15. The light directing film according to claim 13 , wherein the first height of the first elevating portion has a constant value.

16. A light directing film comprising a first structured major surface, a second major surface opposite to the first structured major surface and a reference plane between the first structured major surface and the second major surface, wherein the reference plane is substantially perpendicular to the thickness direction of the light directing film, wherein the first structured major surface comprises a first prism element and a second prism element, wherein each of the first prism element and the second prism element extends substantially in a first direction, and the first prism element and the second prism element are disposed along a second direction substantially perpendicular to the first direction, wherein a first ridge of the first prism element has a first height relative to the reference plane and a second ridge of the second prism element has a second height relative to the reference plane, wherein the first height of the first ridge of the first prism element varies a

Assignees

• Ubright Optronics Corp

Inventors

• Wang Kong-Hua
• Yang Ching-An
• Pan Han-Tsung

Classifications

• G02B5/0278

  used in transmission · CPC title

• G02B5/0231 Primary

  the surface having microprismatic or micropyramidal shape (macroscopic prism arrays G02B5/045) · CPC title

• G02B5/045

  Prism arrays · CPC title

• G02B6/0053

  Prismatic sheet or layer; Brightness enhancement element, sheet or layer · CPC title

• G02F1/133606

  including a specially adapted diffusing, scattering or light controlling members · CPC title