Light source module using laser as light source

Patent metadata

Field	Value
Publication number	US-2015168637-A1
Application number	US-201414255974-A
Country	US
Kind code	A1
Filing date	Apr 18, 2014
Priority date	Dec 13, 2013
Publication date	Jun 18, 2015
Grant date	—

Abstract

A light source module comprises a plurality of laser light sources, a lens module, a plurality of optical components, and a light guiding plate. The lens module includes a first lens having a rear arced plane and a plurality of second lenses each having a front arced plane, and the second lenses are positioned on the first lens and protruded forwardly from the first lens toward the optical components. The optical components are positioned on light path of light emitted from the laser light sources in sequence and each correspond to one second lens, and the optical components are, except the farthest one from the laser light sources, beamsplitters, respectively and used for reflecting a part of the light emitted from the laser light sources to the second lenses and permitting another part of the light to penetrate therethrough to a next optical component.

First claim

What is claimed is:

1 . A light source module configured for illuminating a planar display comprising:
a plurality of laser light sources; a lens module comprising a first lens and a plurality of second lenses, the second lenses positioned on the first lens and protruded from the first lens; a plurality of optical components positioned on light path of light emitted from the laser light sources in sequence and each corresponding to one second lens, the optical components, except a farthest one from the laser light sources, being beamsplitters respectively, and used for reflecting a part of the light emitted from the laser light sources to the second lenses and permitting another part of the light to penetrate therethrough to a next optical component away from the laser light sources; and a light guiding plate comprising an incidence surface facing the lens module, an outputting surface connecting to and perpendicular to the incidence surface, and a bottom surface opposite the outputting surface and connecting with the incidence surface.

2 . The light source module of claim 1 , wherein the laser light sources are collimated light sources.

3 . The light source module of claim 1 , wherein reflectance/transmittance ratios of the optical components are increased along a direction away from the laser light sources.

4 . The light source module of claim 1 , wherein there are five optical components, the reflectance/transmittance ratios of the five optical components are ⅕, ¼, ⅓, ½ and 1 along the direction away from the laser light sources, and the farthest optical component away from the laser light sources is a totally reflective lens.

5 . The light source module of claim 1 , wherein the first lens comprises a first flat plane and a first arced plane neighboring to the first plane, and the second lenses are positioned on the first flat plane of the first lens, each second lens protruding to and facing a corresponding optical component.

6 . The light source module of claim 5 , wherein the first arced plane is curved along a height direction of the first lens.

7 . The light source module of claim 1 , wherein the bottom surface is a total reflective surface with a plurality of protrusions formed thereon.

8 . The light source module of claim 7 , wherein the protrusions each are formed between two serrated recesses in the bottom surface of the light guiding plate.

9 . The light source module of claim 7 , wherein the protrusions each are formed between two arc-shaped recesses in the bottom surface of the light guiding plate.

10 . The light source module of claim 1 , wherein the laser light sources comprise a red laser source, a green laser source and a blue laser source.

11 . The light source module of claim 10 , wherein the red laser source is oriented parallel to the blue laser source and perpendicular to the green laser source, and the red laser source is positioned between the green laser source and the blue laser source.

12 . The light source module of claim 11 further comprising two filters, wherein one of the two filters is a red light filter and the other filter is a blue light filter.

13 . The light source module of claim 12 , wherein the red light filter is positioned at an intersection of the light emitted from the red laser source and the light from the green laser source, and the blue light filter is positioned at an intersection of the light emitted from the green laser source and the light emitted from the green laser source.

14 . An edge-type backlight module comprising:
a plurality of laser light sources; a lens module comprising a first lens and a plurality of second lenses protruded from the first lens; a plurality of optical components positioned parallel to and spaced from each other and inclined to the lens module, and the optical components being, except a farthest one from the laser light sources, used for reflecting a part of the light emitted from the laser light sources to the second lenses and permitting another part of the light to penetrate therethrough to a next optical component away from the laser light sources, and the farthest optical component being used for totally reflecting the light penetrating through and from the other optical components in front thereof; and a light guiding plate comprising an incidence surface facing the first and second lenses, an outputting surface connecting to and perpendicular to the incidence surface, and a bottom surface opposite the outputting surface and connecting with the incidence surface.

15 . The edge-type backlight module of claim 14 , wherein a reflectance/transmittance ratio of the optical component closer to the laser light sources is smaller than that of a neighbor optical component away from the laser light sources.

16 . The edge-type backlight module of claim 15 , wherein there are five optical components, the reflectance/transmittance ratios of the five optical components are ⅕, ¼, ⅓, ½ and 1 in the direction away from the laser light sources, and the farthest optical component away from the laser light sources is a totally reflective lens.

17 . The edge-type backlight module of claim 14 , wherein the first lens comprises a first flat plane and a first arced plane protruding from the first flat plane to the light guiding plate, and the second lenses are positioned on the first flat plane of the first lens, each second lens facing a corresponding optical component, the first arced plane being curved along a height direction of the first lens, each second lens comprising a second arced plane protruding toward the corresponding optical component, the second arced plane being curved along a width direction of the first lens.

18 . The edge-type backlight module of claim 17 , wherein the first lens extends in a first direction, and the second lenses are protruded from the first lens in a second direction which is perpendicular to the first direction.

19 . The edge-type backlight module of claim 14 , wherein the bottom surface of the light guiding plate is a totally reflective surface with a plurality of protrusions thereon and the protrusions each are formed between two serrated recesses in the bottom surface.

20 . The edge-type backlight module of claim 14 , wherein the bottom surface is a totally reflective surface with a plurality of protrusions thereon and the protrusions each are formed between two arc-shaped recesses in the bottom surface.

Assignees

• Hon Hai Prec Ind Co Ltd

Inventors

• Chen Po-Chou

Classifications

• G02B6/0031

  Reflecting element, sheet or layer · CPC title

• G02B6/003

  Lens or lenticular sheet or layer · CPC title

• G02B6/0026

  Wavelength selective element, sheet or layer, e.g. filter or grating · CPC title

• G02B6/0068 Primary

  Arrangements of plural sources, e.g. multi-colour light sources · CPC title