Light-emitting module

• US 9,739,925 B2
• Filed: 11/13/2014
• Issued: 08/22/2017
• Est. Priority Date: 01/29/2014
• Status: Active Grant

• Current Assignee: E Ink Holdings Incorporated
• Original Assignee: E Ink Holdings Incorporated
• Inventors: Shih, Yao-Tsung, Chang, Mei-Chen
• Primary Examiner(s): PAYNE, SHARON E
• Application Number:
  US14/540,042
• Publication Number:
  US 20150212251A1
• Time in Patent Office: 1,013 Days
• Field of Search: None
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources

Abstract

The present disclosure provides a light-emitting module. The light-emitting module includes a light guide, a plurality of light source and a light-adjusting film. The light-adjusting film has a first light absorption portion, a plurality of second light absorption portions and a plurality of light reflection portions. The second light absorption portions are individually extended from the projection position of the light sources on the first light absorption portion, and may absorb part of the light in front of the light sources; and each of the light reflection portions is between two of the adjacent second light adsorption portions, and may reflect the light shinning thereon.

Claims

1. A light-emitting module, comprising:

a light guide plate having a light-entering surface, a first light-extracting surface and a second light-extracting surface opposite to the first light-extracting surface, wherein the first light-extracting surface has a light-adjusting area;

a plurality of light sources for emitting light toward the light-entering surface of the light guide plate; and

a first light-adjusting film having a first light absorption portion, a plurality of second light absorption portions and a plurality of first light reflection portions, wherein the first light absorption portion is positioned over the light sources, the second light absorption portions and the first light reflection portions are positioned on the light-adjusting area of the first light-extracting surface, the second light absorption portions are protruded from a sidewall of the first light absorption portion, and when viewed from above the light guide plate, at least one of the second light absorptions and at least one of the light sources are arranged in a line substantially perpendicular to the sidewall of the first light absorption portion, and one of the first light reflection portions is located between two neighboring second light absorption portions, so that the second light absorption portions and the first light reflection portions are alternately arranged.

2. The light-emitting module of claim 1, wherein the first light absorption portion and the second light absorption portions are black.

3. The light-emitting module of claim 2, wherein the first light absorption portion and the second light absorption portions have a rough surface.

4. The light-emitting module of claim 1, wherein the first light reflection portions are white.

5. The light-emitting module of claim 4, wherein the first light reflection portions further comprise a reflective layer.

6. The light-emitting module of claim 5, wherein the reflective layer is a metal layer.

7. The light-emitting module of claim 6, wherein the material of the metal layer includes silver, aluminum or tin.

8. The light-emitting module of claim 1, wherein a pattern of the first light reflection portions is in rectangle, trapezoid, triangle, semicircle, semiellipse or a combination thereof.

9. The light-emitting module of claim 1, wherein a distance between two neighboring light sources is in a range of about 1 cm to 2 cm.

10. The light-emitting module of claim 1, wherein the second light absorption portions are extended in a range of about 0.3 cm to 1 cm, from the first light absorption portion.

11. The light-emitting module of claim 1, wherein the light sources are a point light source.

12. The light-emitting module of claim 11, wherein the point light source is a light-emitting diode.

13. The light-emitting module of claim 1, wherein a width of the light sources is in a range of about 3 mm to 6 mm.

14. The light-emitting module of claim 13, wherein a width of the second light absorption portions is greater than the width of the light sources.

15. The light-emitting module of claim 1, wherein the first light absorption portion and the second light absorption portions are formed a comb structure.

16. The light-emitting module of claim 1, further comprising a second light-adjusting film having a third light absorption portion, a plurality of fourth light absorption portions and a plurality of second light reflection portions, wherein the third light absorption portion is positioned under the light sources, the fourth light absorption portions and the second light reflection portions are positioned on a light-adjusting area of the second light-extracting surface, the fourth light absorption portions are extended from the third light absorption portion, and one of the second light reflection portions is located between two neighboring fourth light absorption portions, so that the fourth light absorption portions and the second light reflection portions are alternately arranged.

17. A display device, comprising:

a display unit having a display surface; and

the light-emitting module of claim 1 positioned on the display unit, wherein the second light-extracting surface of the light guide plate of the light-emitting module is toward the display surface of the display unit.

18. The display device of claim 17, wherein the display unit is a reflective display unit.