Abstract: A display system, including: a vehicle windshield; a projector located on the side of a first surface of the windshield and arranged to enable to project an image in the windshield, towards a second surface of the windshield opposite to the first surface, so that the angles of incidence of the rays projected on the second surface are greater than the limiting angle of total reflection of the light on the second surface; and a transmissive diffuser coating an area of the first surface located on the path of the projected rays after at least one reflection on the second surface.

Abstract: The invention relates to a method of producing a phase device operating at at least one wavelength (?) comprising a cell containing a liquid crystal possessing a helical structure, inserted between two alignment layers possessing rubbing axes and means for applying a voltage to said cell, said helical structure exhibits a number of helical turns k, said liquid crystal exhibiting a defined angle of twist ? between the rubbing axes of the two alignment layers, characterized in that it comprises the following steps: —the determination of a compensation angle ? satisfying the following equation: (formula) with: N the integer closest to (formula) the angle of twist ?=2K????n: the birefringence of the liquid crystal; d: the thickness of the liquid crystal cell; ?: the wavelength of the light beam which passes through the liquid crystal cell; the rubbing of one of the faces in a direction of alignment of said liquid crystal molecules, defining the angle of twist: ?=2K???.

Abstract: An HMD-type device for displaying an image in augmented reality, comprising: an assembly of light display pixels arranged on a first surface of a transparent support intended to be positioned on the optical path between a user's eye and a real scene to be observed, this assembly comprising a number N greater than 1 of pixel sub-assemblies, each comprising a sufficient number of pixels to display the entire image; and an optical system arranged on a second surface of the support opposite to the first surface, this system comprising N optical sub-systems, each pixel sub-assembly facing one of the optical sub-systems.

Abstract: The present invention involves a rear projection display screen, including at least one assembly including: a film having a surface facing the back of the screen including ridges defining prisms; and an element of controllable refraction index, coating the ridged surface of said film.

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

Abstract: An optical device comprises a transparent blade the first surface of which is reflective; a first partially reflective and partially transmissive layer covering a second surface of the transparent blade opposite the first surface, and a second layer covering the surface of the first layer opposite the transparent blade, wherein the second layer is made of a material having an optical index which differs from the optical index of the transparent blade by less than 10% and preferably by less than 5%, and the second layer comprises, on the surface thereof opposite the first layer, structures forming a diffraction grating suitable for promoting the extraction of light towards the outside of the transparent blade.

Abstract: The invention relates to a matrix display screen which includes, in sequence: a mounting (50); at least one first metal portion (156); a stack of layers (52, 72, 86, 104) including transistors (TFT1, TFT2); and organic light-emitting diodes (32).

Abstract: An optical pumping and isotropic measurement magnetometer. The magnetometer is all-optical in the sense that resonance between Zeeman sub-levels is induced by modulating the intensity or the frequency of the pump beam. Resonance is detected either using the pump beam itself or an unmodulated probe beam. The pump beam is linearly polarised and its polarisation direction is kept constant relative to the direction of the magnetic field to be measured, so that a measurement independent of the orientation of the field can be made.

Abstract: The invention relates to a head-up display comprising a group of optical sub-systems (261, 262, 263) formed in a single plane and having dimensions that diminish moving away from the main optical axis of the display. The display also comprises sub-screens (241, 242, 243), the positions and dimensions of which are defined according to: the length of the optical path (D), the dimensions of the optical sub-systems, and a maximum authorized length of movement in a plane perpendicular to the optical axis and located at a distance equal to the length of the optical path, such that the information projected by the group of sub-screens can be seen along the entire authorized length of movement.

Abstract: The invention concerns a head-up display, comprising at least one combination of a laser source, a movable mirror, a fixed mirror, a diffuser and an optical sub-system, the movable mirror being positioned to divert the beam originating from the laser source towards the fixed mirror in such a way that the beam from the fixed mirror scans the surface of the diffuser before reaching the optical sub-system.

Abstract: An assembly comprises a vehicle windscreen, and a stack of first and second films at least partially coating a face of the windscreen, the first film being arranged between the windscreen and the second film, wherein: the second film is a screen suitable for displaying an image projected on the face thereof opposite the windscreen; and the first film is a reflector suitable for reflecting light transmitted by the second film towards the windscreen.

Abstract: A rear-projection display device comprises a mobile light source supplying a light beam of at least one wavelength, a holographic mirror reflecting only said at least one wavelength, an absorbent screen and a transmissive diffuser, the absorbent screen being placed on the rear face of the holographic mirror, the elements being arranged such that the beam from the light source is reflected on the holographic mirror in order to sweep the surface of the transmissive diffuser.

Abstract: The invention relates to a transmissive diffuser screen comprising a transparent support (50), a first face of the support being covered with a first diffusive micro-structure (52) and a second face of the support being covered with an optical focusing structure (54) of which the primary focal point is disposed at a lighting source (36) of the screen and of which the surface is covered with a second diffusive micro-structure (56).

Abstract: The invention relates to a method for manufacturing a multilayer strucute on a first substrate, the method including: using the first substrate made of a first material having a Young's modulus Ev and a thickness ev, and using a second substrate covered by the multilayer structure, the second substrate being made of a second material having a Young's modulus Es that is different from the Young's modulus Ev and a thickness es, the thicknesses es and ev complying, plus or minus 10%, with the relation (I); molecularly bonding the first substrate and the multilayer structure together; and removing the second substrate.

Abstract: The present invention involves a rear projection display screen, including: a transmissive diffuser; a liquid crystal layer arranged on the rear surface side of the diffuser; and on the side of a first surface of said layer, first and second alternated parallel conductive strips regularly distributed across the entire surface of the screen, the first strips being interconnected, and the second strips being interconnected without being connected to the first strips.

Abstract: The invention relates to a head-up display comprising a group of sub-screens (241, 242, . . . 245) the positions and dimensions of which are defined according to the length of the optical path (D) and the maximum authorized range of movement (B1) in a plane that is perpendicular to the optical path and located at a distance equal to the length of the optical path, such that information projected by the group of sub-screens is seen over the entire authorized movement range.

Abstract: Active matrix liquid crystal displays, mainly applicable to screens with small dimensions, fabricated for example starting from silicon substrates, are especially applicable to display operation in color sequential mode. The pixel comprises a pixel electrode controlled by a control transistor and counter-electrodes situated on the same side of the liquid crystal as the pixel electrode and parallel to the pixel electrode; the liquid crystal is composed of molecules having a natural rest orientation in the absence of a voltage between the pixel electrode and the counter-electrodes and a different orientation in the presence of an electric field created between the pixel electrode and the counter-electrodes. Erase electrodes are situated on either side of the pixel in a transverse direction with respect to the counter-electrodes and are designed to produce, during an erase phase, an erase electric field tending to return the molecules of the liquid crystal to their rest orientation.

Abstract: The invention relates to a method for manufacturing a multilayer structure on a first substrate made of a material having a first Young's modulus. The method includes: providing a second substrate covered with the multilayer structure, the multilayer structure having a planar surface opposite the second substrate, the second substrate being made of a material having a second Young's modulus; applying first deformations to said surface; molecularly boding the first substrate to said surface, the molecular bonding resulting in the appearance of second deformation in said surface in the absence of the first deformations, the first deformations being opposite the second deformations; and removing the second substrate, the resulting deformations in said surface being less than 5 ppm.

Abstract: A rear projection display screen, including a film having a surface facing the back of the screen including ridges having a triangular cross-section defining prisms, wherein at least a wall of each of said ridges has an inclination such that the angle of incidence, on said wall, of a light ray normal to the display is equal, to within 5 degrees, to the Brewster angle of the surface of separation formed by said wall.

Abstract: The invention relates to a head-up display comprising a group of optical sub-systems (261, 262, 263) formed in a single plane and having dimensions that diminish moving away from the main optical axis of the display. The display also comprises sub-screens (241, 242, 243), the positions and dimensions of which are defined according to: the length of the optical path (D), the dimensions of the optical sub-systems, and a maximum authorised length of movement in a plane perpendicular to the optical axis and located at a distance equal to the length of the optical path, such that the information projected by the group of sub-screens can be seen along the entire authorised length of movement.