COLOR SEPARATION SYSTEM

• US 20140118663A1
• Filed: 10/30/2013
• Published: 05/01/2014
• Est. Priority Date: 11/01/2012
• Status: Abandoned Application

• Current Assignee: National Tsing Hua University
• Original Assignee: National Tsing Hua University
• Inventors: CHEN, Cheng-Huan, YAO, Po-Hung
• Application Number:
  US14/067,365
• Publication Number:
  US 20140118663A1
• Time in Patent Office: Days
• US Class Current: 349/62
• CPC Class Codes: G02B 6/003 Lens or lenticular sheet or layer
• CPC Class Codes: G02B 6/0038 Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
• CPC Class Codes: G02B 6/0056 for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02F 1/133621 providing coloured light G02F1/133617, G02F1/133533 take precedence

Abstract

The present invention discloses a color separation system, which uses a plurality of arrayed light source modules to generate light beams having different colors and separated spatially, and which uses a light guide module and an optical lens array to project the light beams having different colors to the display panel of an LCD device in an arrayed form, whereby the color separation system is exempted from using an absorption-type color filter, wherefore the light energy utilization rate is greatly increased. Further, the present invention arranges a reflection-type polarization element on the light output side of the optical lens array and arranges a quarter-wave plate on the bottom face of the light guide module to replace the conventional absorption-type polarization element. Thus, the light energy utilization rate is further increased. Therefore, the present invention can save energy effectively.

Claims

1. A color separation system comprising

a plurality of light source modules arranged in array and each including

a plurality of light emitting elements separately generating a plurality of light beams respectively having different central wavelengths and separated spatially;

and

an alignment lens aligning said plurality of light beams;

a light guide module having at least one light incident face, a light exit face and a bottom face opposite to said light exit face, wherein said light incident face is connected with at least one of said light exit face and said bottom face, and wherein said plurality of light beams generated by said plurality of light source modules are emitted to said light incident face, reflected by said bottom face and projected out of said light guide module from said light exit face; and

an optical lens array arranged near said light exit face of said light guide module, diverting said plurality of light beams coming from said light exit face, and projecting said plurality of light beams outward.

2. The color separation system according to claim 1, wherein said plurality of light emitting elements of each said light source module include at least two of a red light emitting diode, a green light emitting diode, a blue light emitting diode and a white light emitting diode.

3. The color separation system according to claim 1, wherein said alignment lens and said light guide module are integrated into a one-piece component.

4. The color separation system according to claim 1, wherein said alignment lens is a biconvex lens, a plane-convex lens, or a Fresnel lens.

5. The color separation system according to claim 1, wherein said bottom face of said light guide module has a microstructure reflecting said plurality of light beams to said light exit face.

6. The color separation system according to claim 1, wherein said light guide module has two said light incident faces opposite to each other, and wherein a plurality of said light source modules is arranged beside each said light incident face, and wherein optical axes of said alignment lenses opposite to each other are coaxial or shifted with a displacement.

7. The color separation system according to claim 1, wherein said optical lens array includes a plurality of cylindrical lenses.

8. The color separation system according to claim 1 further comprising a reflection-type polarization element arranged on a light output side of said optical lens array for polarizing said plurality of light beams.

9. The color separation system according to claim 8, wherein said reflection-type polarization element is a nanowire-containing grating array or an element containing liquid crystal layers.

10. The color separation system according to claim 8 further comprising a quarter-wave plate arranged on said bottom face of said light guide module to convert the vibration phase of a polarity of said light beams reflected by said reflection-type polarization element.

11. The color separation system according to claim 1 further comprising at least one reflective light guide element arranged on two sides of said light source module, parallel to optical axis of said alignment lens, and used to reflect said plurality of light beams to said light incident face.

12. The color separation system according to claim 1 further comprising a first reflection element arranged between said alignment lens and said light incident face of said light guide module and diverting said plurality of light beams emitting to said light incident face.

13. The color separation system according to claim 1 further comprising a second reflection element arranged on said bottom face of said light guide module to reflect said plurality of light beams to said light exit face.

14. The color separation system according to claim 1 further comprising a light absorption element arranged on at least one lateral side of said light guide module and preventing said plurality of light beams from being reflected back to said light guide module.