Commissariat a L'energie Atomique Et Aux Energies Alternatives

Commissariat a L'energie Atomique

Teem Photonics, Inc.

Centre National De La Recherche Scientifique

Université Grenoble Alpes

Institut Polytechnique De Grenoble

Christophe Martinez

Umberto Rossini

Christophe Kopp

Karen Gilbert

Serge Valette

François Templier

Pierre Ferdinand

Denis Pelenc

Daivid Fowler

Francois Baleras

Alain Fargeix

Bernard Aventurier

Fabien Laulagnet

Basile Meynard

Pascal Boulitreau

Fabian Rainouard

Edouard Oudet

Yann Lee

Device for projecting an image onto an eye, the device comprising a stack comprising light guides, each light guide being coupled to a plurality of diffraction gratings, electrodes, each electrode being associated with a plurality of diffraction gratings of various light guides, each electrode being configured to activate each diffraction grating with which it is associated, a holographic film, the device being characterized in that each light guide extends along a longitudinal axis, in such a way as to form rectilinear segments, two successive rectilinear segments of a given light guide making two different acute angles to the longitudinal axis.

Device for projecting an image into the eye of a user

A Distributed light projection device, including: one or a plurality of waveguides; and above each waveguide, a plurality of extraction cells coupled to distinct portions of the guide, each extraction cell including first and second stacked diffraction gratings.

Distributed light projection device

The invention relates to a videoconferencing system, comprising:

Videoconferencing system allowing a parallax effect associated with the direction of the gaze of a user to be decreased

The invention relates to a system for forming a floating image, including: at least one image projector, a display screen including transparent segments and scattering segments, and a semi-reflective structure placed between the image projector and the display screen, including a face, termed the transmission face, suitable for transmitting light beams coming from the image projector and light beams coming from the scene to be observed, and an opposite face, termed the reflection face, suitable for reflecting light beams coming from the display screen, so as to form a virtual image, termed the floating image, of the image projected onto the display screen.

System for forming a floating image

The invention relates to a method of manufacturing a screen comprising transparent portions and retroreflective portions distributed over all or part of the surface thereof.

Method of manufacturing a screen comprising transparent portions and retroreflective portions

A method of manufacturing a primary mold for the forming of a retroreflective screen, the method including the steps of: a) forming, on the front surface of such a substrate, a layer of a material such that the first substrate is selectively etchable over said layer; and b) forming microrecesses from the rear surface of the first substrate by selective etching of the first substrate over said layer, each microrecess emerging on the rear surface of said layer and having a back parallel to the front surface of the first substrate and first and second lateral walls orthogonal to each other and orthogonal to the back the first and second lateral walls and the back of the microrecess joining at a same point and forming a trihedron.

Method of manufacturing a screen provided with retroreflective microstructures

The invention relates to a screen comprising transparent portions and retroreflective portions distributed over all or part of the surface thereof.

System for displaying an image on a windshield

A retroreflective screen including a first film having a surface including a plurality of microrecesses, each microrecess having a bottom substantially parallel to the mean plane of the screen and first and second lateral walls substantially orthogonal to each other and substantially orthogonal to the bottom, the first and second lateral walls and the bottom of the microrecess joining at a same point and forming a trihedron.

Screen provided with retroreflective microstructures

A light-emitting device including at least a metal layer able to be heated and to propagate surface waves consecutive to the heating of the metal layer, with the metal layer being structured such that it comprises several diffraction patterns able to carry out a diffraction of the surface waves to free-space propagation modes, wherein a synthetic hologram is encoded such that a phase image of a pixel of the hologram is encoded by an offset in the position of one of the diffraction patterns, and a heater of the metal layer.

Light-emitting device with diffractive structures and a synthetic hologram

An image projection device, including: at least one waveguide formed in a substrate; and at least one extraction device including a plurality of extraction cells coupled to different areas of the guide, each cell being capable of being electrically activated to extract light from the guide and project this light along a predetermined projection direction, wherein different extraction cells have projection directions with different orientations.

Image projection device

A method for integrating a synthetic hologram in an image of a scene, including: forming, from a first image of the scene, a first matrix including pixels of two shades according to the gray level of the corresponding pixel of the first image, and a second matrix, image of the gray level difference between the corresponding pixels of the first image and of the first matrix; forming a third matrix based on a second image; forming a fourth matrix having each pixel including a central area with a surface area determined by the corresponding element of the second matrix and off-centered in the pixel according to the corresponding pixel of the third matrix; and performing a lithography of an opaque layer at the surface of a plate according to the pattern defined by the fourth pixel matrix.

Method for integrating a synthetic hologram in a halftone image

The invention relates to a synthetic hologram (A) comprising first elementary cells wherein first openings are respectively defined, said hologram being integrated into a first portion of a binary motif (), said binary motif comprising at least one second portion wherein second elementary cells comprising second openings () are defined, said second openings having an average size equal to the average size of the first openings, with a 5% margin, and a random phase shift.

Method for concealing a synthetic hologram in a binary image

A synthetic hologram of a first image consists of an array of coding cells each comprising light and dark portions. A second visible image is superposed to the synthetic hologram, where the light and dark portions of selected coding cells in the second visible image are inverted and have a phase modified by an offset value relative to other coding cells of the rest of the hologram.

Stacking a visible image and a synthetic hologram

An installation and method for etching at least one wafer coated with an etch-ready, blank photosensitive layer is disclosed. In accordance with an embodiment, the wafer has thickness irregularities, wherein the wafer is arranged to be able to be submitted to irradiation-beam scanning, a sheet transparent to the radiation to which the photosensitive layer is sensitive covers the wafer, and a probe beam intended to reflect on the upper portion of the sheet perpendicularly to the irradiation beam spot on the photosensitive layer is provided.

Growing community of inventors

Grenoble, France

Christophe Martinez