Two imager projection device

Patent metadata

Field	Value
Publication number	US-10477194-B2
Application number	US-201314395930-A
Country	US
Kind code	B2
Filing date	Apr 16, 2013
Priority date	Apr 25, 2012
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

The present disclosure describes optical elements and optical devices that use the optical elements to allow the output of two imagers to be combined onto a single optical axis. Each of the two imagers can be based on alternate polarization directions, and the disclosed embodiments can enable high contrast 3D projectors without requiring either time or polarization sequencing. The present disclosure further describes projection systems that include the optical devices.

First claim

What is claimed is:

1. An imaging device, comprising:
a first reflective polarizer laminate disposed to intercept an unpolarized input light and reflect a first polarization direction of the unpolarized input light toward a first imager and transmit a second polarization direction of the light, wherein the first reflective polarizer laminate comprises a polymeric multilayer first reflective polarizer aligned to the first polarization direction adjacent a first half-wave retarder and a third reflective polarizer aligned to the first polarization direction adjacent a third half-wave retarder;
a second imager disposed facing the first imager such that the first reflective polarizer laminate is between the first and the second imager; and
a second reflective polarizer laminate disposed to intercept the unpolarized input light and reflect the second polarization direction of the unpolarized input light toward the second imager and transmit the first polarization direction of the light, wherein the second reflective polarizer laminate comprises a polymeric multilayer second reflective polarizer aligned to the first polarization direction adjacent a second half-wave retarder and a fourth reflective polarizer aligned to the first polarization direction adjacent a fourth half-wave retarder;
wherein the first polarization direction of the unpolarized input light reflects from the first imager, is reflected from the second and fourth reflective polarizers, and exits the imaging device as a first imaged second polarization direction light, and the second polarization direction of the unpolarized input light reflects from the second imager, is reflected by the first and third reflective polarizers, and exits the imaging device as a second imaged first polarization direction light.

2. The imaging device of claim 1 , wherein a first portion of the first polarization direction of the unpolarized input light reflects from the first reflective polarizer laminate and passes through the second reflective polarizer laminate before intercepting the first imager, and a remaining portion of the first polarization direction of the unpolarized input light passes through the second reflective polarizer laminate and reflects from the first reflective polarizer laminate before intercepting the first imager.

3. The imaging device of claim 1 , wherein a first portion of the second polarization direction of the unpolarized input light reflects from the second reflective polarizer laminate and passes through the first reflective polarizer laminate before intercepting the second imager, and a remaining portion of the second polarization direction of the unpolarized input light passes through the first reflective polarizer laminate and reflects from the second reflective polarizer laminate before intercepting the second imager.

4. The imaging device of claim 1 , wherein the first and second polarization direction comprise orthogonal polarization directions.

5. The imaging device of claim 4 , wherein the orthogonal polarization directions comprises linear polarization.

6. The imaging device of claim 1 , wherein each of the reflective polarizer laminates are disposed as pellicles or as interior surfaces of an X-cube.

7. The imaging device of claim 1 , wherein images produced by the first imager and the second imager each comprise a portion of a stereoscopic image.

8. The imaging device of claim 1 , wherein the first imager and the second imager comprise a liquid crystal imager, a liquid crystal on silicon (LCOS) imager, a digital micromirror imager, or a combination thereof.

9. The imaging device of claim 8 , wherein the digital micromirror imager further comprises a quarter-wave retarder.

10. The imaging device of claim 1 , wherein the unpolarized input light comprises a time-sequenced color input.

11. The imaging device of claim 1 , wherein the first and second imagers in combination comprise an alternating time-sequenced first stereoscopic image and second stereoscopic image.

Assignees

• 3M Innovative Properties Co

Inventors

• Carls Joseph C
• Schardt Craig R
• Preiss Duane E
• Baldwin Dwight E

Classifications

• G03B35/26

  using polarised or coloured light separating different viewpoint images · CPC title

• G02B27/149

  using crossed beamsplitting surfaces, e.g. cross-dichroic cubes or X-cubes · CPC title

• G03B21/2073

  Polarisers in the lamp house (peculiar to electronic spatial light modulators H04N9/3197) · CPC title

• G03B21/005

  Projectors using an electronic spatial light modulator but not peculiar thereto · CPC title

• H04N13/239

  using two two-dimensional [2D] image sensors having a relative position equal to or related to the interocular distance (H04N13/243 takes precedence) · CPC title