Compatible 3D video display using commercial television broadcast standards and equipment

• US 4,740,836 A
• Filed: 06/25/1986
• Issued: 04/26/1988
• Est. Priority Date: 12/05/1983
• Status: Expired due to Fees

• Current Assignee: Dwin R. Craig
• Original Assignee: Dwin R. Craig
• Inventors: Craig, Dwin R.
• Primary Examiner(s): Britton, Howard W.
• Application Number:
  US06/878,224
• Time in Patent Office: 671 Days
• Field of Search: 358/3, 358/88, 358/92, 358/91, 350/132, 350/139, 350/286, 351/175, 364/522
• US Class Current: 348/49
• CPC Class Codes: H04N 13/339 using spatial multiplexing H04N13/337 takes precedence

Abstract

A video display operating at standard commercial television broadcast sweep rates, line spacing and/or pixel density. An over and under split screen presentation of a stereoscopic pair of images permits three dimensional viewing by audiences of any size using simple optical deviation elements mounted in a pair of spectacles. Besides being compatible with broadcast standards, the display is compatible with the format already used in producing 3D motion picture films permitting unaltered broadcast of such films and/or direct transfer to video tape with existing equipment. The recorded video can then be viewed by said optical deviation elements. The final display, when viewed stereoscopically, exhibits an aspect ratio of more than twice the width to height which is about the same as motion picture screens and well suited for display of sporting events regularly broadcast on television. The said display is compatible with normal viewing without the steroscopic impression, by the unaided eyes and seen in full color with normal clarity and definition.

Claims

1. Apparatus for generating a stereoscopic video split field display comprising 4 mirrors forming a pair of reflecting periscopes oriented at 90 degrees with respect to each other situated in front of a conventional video camera operating at scanning rates compatible with accepted commercial broadcast standards, wherein the upper and lower halves of said display comprise a pair of stereoscopic images suitable for viewing through optical path deviating means.

2. Apparatus for viewing the display of claim 1 wherein said optical path deviating means provide continuously variable deviation angles of the optical path connecting one of said images with only one eye of the observer.

3. Apparatus as in claim 1 where said optical path deviating means include a pair of plano-cylinder refracting elements with mating curved surfaces in sliding contact with each other.

4. Apparatus as in claim 1 wherein said periscopes are arranged so that the upper image is the left eye view and the lower image is the right eye view of the stereoscopic pair.

5. Apparatus as in claim 1 wherein the reflecting elements of said periscopes are rotateable to control the angle between the entering and emerging optical paths of each periscope.

6. Apparatus as in claim 3 where said refracting elements are composed of materials having different optical dispersion properites in order to reduce color fringling of the deviated image.

7. Apparatus as in claim 3 where said mating curved surfaces are separated by a viscous fluid whose refractive index substantially equals that of the adjacent solid elements.

8. Apparatus for viewing a split field stereoscopic display where the two fields are differentially polarized at the display and the viewing apparatus comprises a pair of conventional polarizing sunglasses supporting an attachment in front of one eye, said attachment comprising an optical path deviating means and a half wave retardation plate which rotates the plane of the incoming polarized light through an angle of 90 degrees.