Stereoscopic three dimensional large screen liquid crystal display

• US 4,647,966 A
• Filed: 11/22/1985
• Issued: 03/03/1987
• Est. Priority Date: 11/22/1985
• Status: Expired due to Fees

• Current Assignee: the united states of america as represented by the secretary of the navy
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Phillips, Thomas E., Marez, John
• Primary Examiner(s): Britton, Howard W.
• Assistant Examiner(s): Kostak, Victor R.
• Application Number:
  US06/801,021
• Time in Patent Office: 466 Days
• Field of Search: 358/88, 358/92, 358/3, 358/231, 358/237, 358/242, 358/60, 350/342, 350/351, 350/331 R, 350/374, 350/401, 350/402, 350/407, 350/132, 350/394, 353/7, 353/8, 346/17, 382/42
• US Class Current: 348/58
• CPC Class Codes: H04N 13/243 using three or more 2D image sensors
• CPC Class Codes: H04N 13/337 using polarisation multiplexing

Abstract

A three dimensional large screen liquid crystal projection display utilizeswo liquid crystal light valves in tandem to produce polarization-type stereoscopic images in a large screen display format. Each light valve, driven separately by video input derived either from live scenes or computer generated data, presents one view of a stereoscopic image pair. Using one projection lamp, one projection lens, and a polarizing beamsplitter cube, the two images are optically combined and projected simultaneously onto a non-depolarizing screen. The particular optical geometry used results in orthogonal linear polarizations for the two images, so they can be viewed stereoscopically using polaroid glasses with appropriately oriented polarizing axes.

Claims

1. An apparatus for displaying three-dimensional projected images on a distant screen comprising:

first means for receiving a first sequency of light beams and for selectively changing the polarization orientation of linearly polarized light incident thereon in response to said first sequence of light beams;

second means for receiving a second sequence of light beams and for selectively changing the polarization orientation of linearly polarized light incident thereon in response to said second sequence of light beams;

first writing means, operably connected to said first means fore receiving, for selectively generating said first sequence of light beams;

second writing means, operably connected to said second means for receiving, for selectively generating said second sequence of light beams; and

means disposed for projecting a high intensity light beam onto said first and second means for receiving;

said first and second means for receiving and said means disposed for projecting being positioned with respect to each other such that light reflected from said first means for receiving does not impinge upon said second means for receiving and such that light reflected from said second means for receiving does not impinge upon said first means for receiving.

2. The apparatus of claim 1 wherein said means disposed for projecting comprises:

one and only one bipolar prism; and

a high intensity light source disposed to irradiate said bipolar prism.

3. The apparatus of claim 1 wherein said first and second writing means comprise first and second cathode ray tubes optically coupled to said first and second means for receiving, respectively.

4. The apparatus of claim 3 wherein:

said first and second means for receiving comprise first and second liquid crystal light valves.

5. The apparatus of claim 4 further comprising:

first and second cathode ray tube electronics drive modules respectively connected to said first and second cathode ray tubes.