Display device comprising a screen having a network of three dimensional reflective microstructures

Patent metadata

Field	Value
Publication number	US-9229310-B2
Application number	US-201414567659-A
Country	US
Kind code	B2
Filing date	Dec 11, 2014
Priority date	Dec 11, 2013
Publication date	Jan 5, 2016
Grant date	Jan 5, 2016

Abstract

The general field of the invention is that of display systems including an image projector and an associated display screen, said display system being intended for use by an observer situated at a specified location, said display screen having two transparent and substantially parallel faces, and said display screen having on at least one of its transparent faces a plurality of regularly distributed optical patterns. The image projector according to the invention illuminating the screen at a plurality of angles of incidence determined by the position and size of the display screen, and said angles of incidence being centered on an average angle of incidence, the optical patterns have at least one curved reflective surface orientated so as to reflect the light rays having at least the average angle of incidence in one or more directions corresponding to said specified location of the observer. A plurality of embodiments are described.

First claim

What is claimed is:

1. A display system including an image projector and an associated display screen, the display system being intended for use by an observer situated at a specified location, the display screen having two transparent and substantially parallel faces, and the display screen having on at least one of its transparent faces a plurality of regularly distributed optical patterns, wherein the image projector forms projected images on the display screen at a plurality of angles of incidence determined by a position and a size of the display screen, wherein the angles of incidence are centred on an average angle of incidence, and wherein the optical patterns have at least one curved reflective surface orientated so as to reflect light rays having at least the average angle of incidence in one or more directions corresponding to the specified location of the observer.

2. The display system according to claim 1 , wherein the orientation of each pattern is adapted to the angle of incidence of light which emerges from the image projector and which illuminates the pattern.

3. The display system according to claim 1 , wherein each pattern has a single convex reflective surface.

4. The display system according to claim 1 , wherein each pattern has only a single concave reflective surface.

5. The display system according to claim 1 , wherein each pattern has only two concave reflective surfaces.

6. The display system according to claim 5 , wherein the two concave reflective surfaces are cylindrical and inclined with respect to a plane of the transparent faces, the two surfaces substantially forming a dihedral, an axis of the first cylindrical surface being parallel to the plane of the transparent faces, and an axis of the second cylindrical surface lying in a plane perpendicular to the plane of the transparent faces.

7. The display system according to claim 1 , wherein the patterns are pentaprisms applied to one of the transparent faces, each pentaprism having a flat input face directed towards the image projector, an output face having a curved part directed towards the user, two flat reflective planes and a curved reflective face.

8. The display system according to claim 1 , wherein each pattern has a microlens positioned on a first transparent face of the two transparent faces and a convex micromirror positioned on a second transparent face of the two transparent faces, a focal length of the microlens being substantially equal to an optical thickness of the screen, the micromirror being positioned in a focusing area of the microlens.

Assignees

• Thales Sa

Inventors

• Pelletier Sebastien
• Gueguen Aude
• Grossetete Matthieu
• Bardon Jean-Luc
• Laluque Laurent

Classifications

• G02B2027/013

  comprising a combiner of particular shape, e.g. curvature · CPC title

• G02B27/0101

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

• G02B5/0284

  used in reflection · CPC title

• G02B3/0006

  Arrays (G02B3/02, G02B5/188 take precedence) · CPC title

• G02B2027/0127

  comprising devices increasing the depth of field · CPC title