Autostereoscopic projection device

Patent metadata

Field	Value
Publication number	US-9479765-B2
Application number	US-201514675930-A
Country	US
Kind code	B2
Filing date	Apr 1, 2015
Priority date	Nov 10, 2014
Publication date	Oct 25, 2016
Grant date	Oct 25, 2016

Abstract

An autostereoscopic projection device includes an illuminating module, a light modulator, an optical module, and a lens module. The illuminating module is for providing light beams having different deflection angles in sequence. The light modulator is for modulating the light beams into compound images in sequence. The optical module is for guiding the light beams provided by the illuminating module to the light modulator, and guiding the compound images to the lens module. The lens module includes a beam splitting prism group, a first spatial filter, a second spatial filter, and a lens. The optical module is disposed at the incident surface of the beam splitting prism group. The first and second spatial filters are disposed at the first and second relay surfaces of beam splitting prism group for filtering the compound images to first and second images in sequence. The second images are different from the first images.

First claim

What is claimed is:

1. An autostereoscopic projection device, comprising:
an illuminating module for providing a plurality of light beams in sequence, wherein the light beams have different deflection angles;
a light modulator for modulating the light beams into a plurality of compound images in sequence;
an optical module for guiding the light beams provided by the illuminating module to the light modulator; and
a lens module, wherein the optical module is further for guiding the compound images to the lens module, and the lens module comprises:
a beam splitting prism group having an incident surface, a light-emitting surface, a first relay surface, and a second relay surface, and comprising a double-sided reflector disposed between the first relay surface and the second relay surface, wherein the optical module is disposed at the incident surface;
a first spatial filter disposed at the first relay surface for filtering the compound images to a plurality of first images in sequence;
a second spatial filter disposed at the second relay surface for filtering the compound images to a plurality of second images in sequence, wherein the second images are different from the first images; and
a lens disposed at the light-emitting surface.

2. The autostereoscopic projection device of claim 1 , wherein the beam splitting prism group further comprises:
a first right angle prism having the incident surface and the light-emitting surface;
a second right angle prism having the first relay surface; and
a third right angle prism having the second relay surface, wherein the double-sided reflector is disposed between the second right angle prism and the third right angle prism.

3. The autostereoscopic projection device of claim 1 , wherein the compound image comprises a plurality of pixel images arranged in an array manner, the first spatial filter only reflects odd columns of the pixel images, and the second spatial filter only reflects even columns of the pixel images.

4. The autostereoscopic projection device of claim 3 , wherein the first spatial filter comprises:
a transparent plate; and
a reflective layer disposed on the transparent plate, wherein the reflective layer corresponds to the odd columns of the pixel images.

5. The autostereoscopic projection device of claim 3 , wherein the first spatial filter comprises:
a reflective plate; and
a light-absorbing layer disposed on the reflective plate, the light-absorbing layer corresponds to the even columns of the pixel images.

6. The autostereoscopic projection device of claim 1 , wherein the lens module further comprises:
a first relay lens group disposed between the beam splitting prism group and the first spatial filter; and
a second relay lens group disposed between the beam splitting prism group and the second spatial filter.

7. The autostereoscopic projection device of claim 6 , wherein both of the first relay lens group and the second relay lens group are off-axially disposed from the optical axis of the compound images.

8. The autostereoscopic projection device of claim 1 , wherein the lens module further comprises:
an entrance lens group disposed between the beam splitting lens group and the optical module.

9. The autostereoscopic projection device of claim 1 , wherein the optical module comprises a total internal reflection prism group.

10. The autostereoscopic projection device of claim 1 , wherein the optical module comprises:
a light source for providing the light beams; and
a light-deflecting device for deflecting the light beams to different angles in sequence.

Assignees

• Delta Electronics Inc

Inventors

• Huang June-Jei

Classifications

• G03B21/008

  using micromirror devices · CPC title

• G02B30/40

  giving the observer of a single two-dimensional [2D] image a perception of depth · CPC title

• G03B21/28

  Reflectors in projection beam {(in illumination beam G03B21/2066)} · CPC title

• H04N13/363

  using image projection screens (volumetric display H04N13/388) · CPC title

• G03B35/16

  by sequential viewing · CPC title