Abstract: The invention relates to a bidirectional wireless communication device which is based on the use of light, including emitting modules, each emitting amplitude- and/or phase-modulated light; and a receiving module made up of: a photodetector illuminated by said modulated light and generating a modulated electrical signal in response to said modulated light; and a processing module for processing the signal generated by said photodetector.

Abstract: Problem addressed: how to decrease the loss of visual quality in an image that appears when this image is placed behind a semitransparent photovoltaic sheet or film. Solution: on the one hand, increase the luminosity of the image by depositing a white-coloured or metallic or reflective layer on the side of the photovoltaic cells that is turned towards the image; and on the other hand, by modifying the luminosity, the contrast, and the colour saturation of the image.

Abstract: The invention relates to a bidirectional wireless communication device which is based on the use of light, including emitting modules, each emitting amplitude- and/or phase-modulated light; and a receiving module made up of: a photodetector illuminated by said modulated light and generating a modulated electrical signal in response to said modulated light; and a processing module for processing the signal generated by said photodetector. The receiving module includes an electronic means positioned between the photodetector and the signal-processing module and capable of matching the impedance of the photodetector to maximize the signal-to-noise ratio of the electrical signal by minimizing distortions of said electronic signal associated with incorrect impedance matching at the output of the photodetector, while maximizing the level of the modulated electrical signal and the throughput of transmitted data.

Abstract: Problem addressed: how to decrease the loss of visual quality in an image that appears when this image is placed behind a semitransparent photovoltaic sheet or film. Solution: on the one hand, increase the luminosity of the image by depositing a white-colored or metallic or reflective layer on the side of the photovoltaic cells that is turned towards the image; and on the other hand, by modifying the luminosity, the contrast, and the color saturation of the image.

Abstract: A coded-light communication device is described, in which the communication has an initial signal-to-noise ratio, which varies according to the lighting conditions. The device comprises at least one photodetector-type light receiver comprising an anode and a cathode and having an initial shunt resistance. The receiver is capable of being simultaneously exposed to a coded light source carrying a signal and a non-coded light source. The anode and cathode are short-circuited by at least one short-circuit resistance arranged inside the photodetector, having a value selected so that the new value of the shunt resistance of the photodetector resulting from the connection of the initial shunt resistance and the short-circuit resistance gives the communication device a new resultant signal-to-noise ratio which remains substantially independent of the intensity of the non-coded light.

Abstract: The invention relates to thin-film photovoltaic modules which are made semi-transparent by laser ablation or by lithography processes. The transparency areas form a network of repetitive patterns such as a network of circular or hexagonal holes. The electrical insulation lines and the electrical interconnection lines between the cells are positioned at random either in the transparency areas or in the non-transparency areas, and demonstrate visual effects which reduce the homogeneous quality of the photovoltaic module. In order to make them invisible to the naked eye, the electrical insulation lines are positioned in transparency areas arranged in straight bands having high transparency density, and the electrical interconnection lines are positioned in transparency areas arranged in straight bands having low transparency density.

Abstract: The invention relates to a wireless communication device which uses light, comprising at least: a light source emitting a modulated light signal; a photovoltaic module capable of receiving said modulated light signal; and an analog-to-digital converter electrically connected to the output terminals of said photovoltaic module, making it possible to convert the analog signal output by the photovoltaic module into a digital signal; characterised in that it also comprises a means for polarising said photovoltaic module making it possible to generate a polarisation voltage applied to the terminals of said photovoltaic module, and a management module capable of optimising said polarisation voltage into a threshold voltage corresponding to an improved signal-to-noise ratio and communication bandwidth.

Abstract: The invention relates to a bidirectional wireless communication device which is based on the use of light, including emitting modules, each emitting amplitude- and/or phase-modulated light; and a receiving module made up of: a photodetector illuminated by said modulated light and generating a modulated electrical signal in response to said modulated light; and a processing module for processing the signal generated by said photodetector. The receiving module includes an electronic means positioned between the photodetector and the signal-processing module and capable of matching the impedance of the photodetector to maximise the signal-to-noise ratio of the electrical signal by minimising distortions of said electronic signal associated with incorrect impedance matching at the output of the photodetector, while maximising the level of the modulated electrical signal and the throughput of transmitted data.

Abstract: A display device provided with a polarising photovoltaic module includes (a) a plurality of polarisers; (b) a plurality of pixels which emit or transmit light referred to as image light; (c) a plurality of photovoltaic active zones and a plurality of openings, two adjacent photovoltaic active zones forming an opening and said photovoltaic active zones being arranged between the pixels and the polarisers; wherein said polarisers are semi-reflective and are made up of one or more surfaces selected among planar surfaces, which are concave or convex, and have parabolic, conical, pyramidal, tetrahedral, semi-cylindrical or cylindrical-parabolic shapes, said polarisers being arranged so as to concentrate, by reflection, a first linear polarised component of the ambient light onto said photovoltaic active zones, as well as to transmit, through the polarising photovoltaic module, a second linear polarised component of the ambient light or of the image light.

Abstract: Process for manufacturing a photovoltaic module placed on an emissive display device, said photovoltaic module comprising an array containing a plurality of photovoltaic cells and a plurality of transparent zones called “orifices”, and said photovoltaic module comprising an array of optical elements able to focus, by refraction or reflection, the light emitted by the device into the orifices.

Abstract: A display device comprising at least: (a) a plurality of photovoltaic active areas and a plurality of holes, two neighboring photovoltaic active areas forming an opening; (b) one or more artificial light sources; (c) a plurality of light concentrators and reflective opaque disposed between said light sources and said photovoltaic active areas. This device wherein said hubs of light are arranged so that the light emitted from artificial light sources is directed by the light concentrators through the holes.

Abstract: A network of photovoltaic strips positioned in front of an image causes a decrease in the luminosity of said image, which is not uniform for all of the colours and causes an optical moiré phenomenon that is perceived by the observer when they change their viewing angle. In order to rectify said decrease in visual quality of the image, the invention describes a suitable positioning and dimension of the photovoltaic strips in relation to the inter-pixels of the image.

Abstract: The invention relates to a display device including a plurality of pixels forming an image, and an optical plate arranged opposite the image and having transparency areas configured to allow the light from the pixels to at least partially pass therethrough. The optical plate further includes at least one array of functional elements corresponding to an electronic and/or mechanical function. The functional elements are inserted between the transparency areas and arranged such that the light emitted by the pixels is directed so as to pass through the transparency areas without intercepting the arrays of functional elements, so as to render the arrays of functional elements invisible or quasi-invisible to an observer of the display device. The invention can be used in any type of display device in which functions other than display itself must be integrated in a visually discreet manner.

Abstract: An optical device includes (a) a sensor of luminous energy from an external light source; (b) a transparent plate between the external light source and the sensor, having a first, front surface oriented towards the external light source and a second, rear surface oriented towards the sensor, the transparent plate being optically structured on one of the two surfaces thereof by a plurality of straight optical elements that are parallel to one another; and (c) a plurality of image strips separated by transparency strips. The longitudinal axis of the image strips is tilted by an angle (a) other than zero relative to the longitudinal axis of the optical elements of the transparent plate, such that images viewed through the transparent plate appear with a certain relief, while the energy production of the sensor remains substantially constant regardless of the angle of incidence of external light on the device.

Abstract: Process for manufacturing a photovoltaic module placed on an emissive display device, said photovoltaic module comprising an array containing a plurality of photovoltaic cells and a plurality of transparent zones called “orifices”, and said photovoltaic module comprising an array of optical elements able to focus, by refraction or reflection, the light emitted by the device into the orifices.

Abstract: The invention relates to a photovoltaic mono cell that is semi-transparent to light, comprising a plurality of active photovoltaic zones that are separated by transparent zones, said active photovoltaic zones being formed from a stack of thin films arranged on a substrate that is transparent to light, said stack of thin films consisting at least of a transparent electrode, an absorber layer and a metal electrode, said transparent zones being apertures produced at least in the metal electrode and in the absorber layer in order to allow as much light as possible to pass, characterized in that it furthermore comprises an electrically conductive collecting gate arranged either making contact with the front electrode in order to decrease the electrical resistance of the transparent electrode, or making contact with the absorber in order to facilitate collection of the electrical current generated by said mono cell.

Abstract: The invention relates to a device including a solar panel, a transparent plate serving as a light guide, an image consisting of multiple opaque or semitransparent image areas separated by totally transparent areas or micro-holes exposing said solar panel, wherein said image is printed on or directly arranged against said transparent plate, and a light source propagates the light thereof within the body of said transparent plate. Said device is particularly characterized in that said transparent plate comprises optical means arranged so as to redirect most of the light injected by said light source towards the image areas.

Abstract: A printed panel for displaying an image includes at least one printed image formed by a plurality of opaque parallel strips that are evenly spaced from one other and separated by transparent strips; an optical system formed by the juxtaposition of two flat lenses, the flat lenses of the optical system being arranged in parallel to the plurality of opaque and transparent strips of the printed image; and at least one photovoltaic panel having a surface for collecting sunlight that is arranged opposite a rear surface of the optical system.

Abstract: A network of photovoltaic strips positioned in front of an image causes a decrease in the luminosity of said image, which is not uniform for all of the colours and causes an optical moirè phenomenon that is perceived by the observer when they change their viewing angle. In order to rectify said decrease in visual quality of the image, the invention describes a suitable positioning and dimension of the photovoltaic strips in relation to the inter-pixels of the image.