Stereoscopic visual display system with active wavelength multiplexing

Patent metadata

Field	Value
Publication number	US-2016124234-A1
Application number	US-201514927422-A
Country	US
Kind code	A1
Filing date	Oct 29, 2015
Priority date	Oct 31, 2014
Publication date	May 5, 2016
Grant date	—

Abstract

Visual display systems are described having means for generating stereoscopic images, a device for visual display of said stereoscopic images having a projector and a semitransparent screen; and a pair of stereoscopic spectacles. The projector according to the invention has an imager and an interference filter, the spectral transmission of which has at least one transmission band of determined width centred around a wavelength, said wavelength being dependent on the incidence of the light on said interference filter. The projector has means allowing the angular position of the filter to be varied between two determined positions so as to transmit, according to the position, either a first spectral band or a second spectral band. The pair of stereoscopic spectacles has a first lens transmitting the first spectral band and blocking the second spectral band and a second lens providing the opposite function.

First claim

1 . A visual display system comprising means for generating stereoscopic images of a predetermined object, a visual display device for said stereoscopic images comprising a projector for stereoscopic images and a semitransparent screen; and a pair of stereoscopic spectacles, said projector comprising an imager, wherein:
the projector comprises:
an interference filter arranged in front of the imager, the spectral transmission of which has at least one transmission band of determined width centred around a wavelength, said wavelength being dependent on the incidence of the light on said interference filter, and;
controllable rotation means allowing the angular position of the interference filter to be varied between two determined positions so as to transmit, for the first position, a first spectral band and, for the second position, a second spectral band;
the pair of stereoscopic spectacles comprising a first lens transmitting the first spectral band and blocking the second spectral band and the second lens transmitting the second spectral band and blocking the first spectral band.

2 . The visual display system according to claim 1 , wherein the projector comprises:
an interference filter, the spectral transmission of which has three transmission bands of determined width centred around three wavelengths, said wavelengths being dependent on the incidence of the light on said interference filter; and means allowing the angular position of the filter to be varied between two determined positions so as to transmit, for the first position, three first spectral bands and, for the second position, three second spectral bands; the pair of stereoscopic spectacles comprising a first lens transmitting the three first spectral bands and blocking the three second spectral bands and a second lens transmitting the three second spectral bands and blocking the three first spectral bands.

3 . The visual display system according to claim 1 , wherein the determined angular positions of the interference filter are programmable according to the constraints of set-up of the visual display system.

4 . The visual display system according to claim 1 , wherein the pair of spectacles comprises means of filtering that is common to the two lenses so that a wavelength situated in the area of overlap of said means of filtering that is common to the two lenses is filtered by the first lens and by the second lens.

5 . The visual display system according to claim 1 , wherein the system comprises detection means for the relative position of the pair of spectacles in relation to the position of the semitransparent screen and means for computing the stereoscopic images so that the position of the stereoscopic image of the object is fixed in a predetermined reference frame and independent of the position of the stereoscopic spectacles.

6 . The visual display system according to claim 5 , wherein the projector comprises a servocontrol system so that the determined angular positions of the interference filter are dependent on the relative position of the pair of spectacles in relation to the position of the semitransparent screen.

7 . The visual display system according to claim 1 , wherein the distance of the predetermined object from the user is between a few centimetres and optical infinity.

8 . The visual display system according to claim 1 , wherein the visual display system is an aircraft cockpit system.

Assignees

• Thales Sa

Inventors

• Coni Philippe
• Grossetete Matthieu
• Gueguen Aude

Classifications

• G02B5/28 Primary

  Interference filters · CPC title

• G02B30/23 Primary

  using wavelength separation, e.g. using anaglyph techniques · CPC title

• G02B30/24

  involving temporal multiplexing, e.g. using sequentially activated left and right shutters · CPC title

• H04N13/363

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

• G02B27/0101

  characterised by optical features (G02B27/0172 takes precedence) · CPC title