Classifications

• • G—PHYSICS
  • G02—OPTICS
  • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
  • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
  • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
  • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
  • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
  • G02F1/1333—Constructional arrangements; Manufacturing methods
• • G—PHYSICS
  • G02—OPTICS
  • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
  • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
  • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
  • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
  • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
  • G02F1/1333—Constructional arrangements; Manufacturing methods
  • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
  • G02F1/133553—Reflecting elements
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
  • H10F19/00—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
  • H10F19/30—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules comprising thin-film photovoltaic cells
  • H10F19/31—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules comprising thin-film photovoltaic cells having multiple laterally adjacent thin-film photovoltaic cells deposited on the same substrate
  • H10F19/37—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules comprising thin-film photovoltaic cells having multiple laterally adjacent thin-film photovoltaic cells deposited on the same substrate comprising means for obtaining partial light transmission through the integrated devices, or the assemblies of multiple devices, e.g. partially transparent thin-film photovoltaic modules for windows
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
  • H10F19/00—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
  • H10F19/80—Encapsulations or containers for integrated devices, or assemblies of multiple devices, having photovoltaic cells
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
  • H10F55/00—Radiation-sensitive semiconductor devices covered by groups H10F10/00, H10F19/00 or H10F30/00 being structurally associated with electric light sources and electrically or optically coupled thereto
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
  • H10F77/00—Constructional details of devices covered by this subclass
• • G—PHYSICS
  • G02—OPTICS
  • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
  • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
  • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
  • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
  • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
  • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
  • G02F1/13324—Circuits comprising solar cells
• • G—PHYSICS
  • G02—OPTICS
  • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
  • G02F2203/00—Function characteristic
  • G02F2203/02—Function characteristic reflective
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E10/00—Energy generation through renewable energy sources
  • Y02E10/50—Photovoltaic [PV] energy

Definitions

• the present invention relates to devices provided with photovoltaic elements intended to be placed in front of an image, and in which the dimensions and the arrangements of the photovoltaic elements are chosen so as to minimize the visual degradation of the image by the photovoltaic elements.
• Photovoltaic surfaces are used to produce electricity from the ambient light which allows to supply energy, at least partially, certain devices used in our daily life. In order to preserve the aesthetics of our environment, it is desirable to make these photovoltaic surfaces colorful to avoid the black appearance of conventional photovoltaic panels, or to make them as transparent as possible to reveal the environment of photovoltaic surfaces, but not the photovoltaic surfaces themselves.
• Some techniques are already known for rendering a photovoltaic surface transparent without causing visual distortion of the image which is placed behind it, such as arranging the photovoltaic elements in very thin parallel strips whose width is smaller than the separating power of the eye, effectively making photovoltaic elements invisible to the naked eye.
• the production of electrical energy is proportional to the surface of photovoltaic elements, there is every interest in multiplying the number of thin photovoltaic bands, the consequence being to block the incident light which illuminates the image if it is a passive image, or to block the light emitted by the image if it is a landscape or an electronic image or a backlit image.
• the image loses brightness in proportion to the surface of the photovoltaic elements interposed between the observer and the image, therefore proportionally to the number of thin strips that are used.
• a compromise is therefore always sought between a maximum of photovoltaic strips to produce a maximum of electricity and a minimum of photovoltaic bands to reduce only marginally the brightness of the image.
• the width of the bands and the distance between them are chosen according to the distance of the observer so that his eye does not perceive the existence of these bands. This will be the case if these values are lower than the separating power of the eye, an angle of 0.017 degree. Thus for a vision at 20 cm this angle is equivalent to a distance between the bands that must be less than 60 micrometers.
• the additional lenticular network modifies the optical path of the light emitted by the backlight, so that the light bypasses the photovoltaic areas, so that through the lenticular array, no Moiré phenomenon can occur.
• This solution has a price, namely the integration of a lenticular network in such a fine structure.
• the problem that the present patent application seeks to solve is to avoid the Moiré phenomena that appear during a random positioning of an opaque photovoltaic array, on a pixel array, and this in the absence of a lenticular network to redirect light.
• Document US 2010/245731 A1 also discloses an array of photovoltaic cells which is covered by a network of color filters.
• this document provides (paragraph [0050] and claim 1) that the photovoltaic cells transmit their respective colors much better, which means that their material is semi-transparent for certain visible wavelengths. This document therefore does not present a solution in the case where the photovoltaic zones are opaque, which favors the appearance of Moiré phenomena due to the random masking of the pixels by the opaque photovoltaic zones.
• pixels including color screen pixels, are generally composed of three fundamental colors, Red, Green, Blue, (RGB), whose brightness is individually controlled to give the desired color.
• RGB Red, Green, Blue
• this brightness is controlled by the rotation of a polarizing filter.
• the fact of randomly placing a network of opaque photovoltaic bands in front of the pixels then causes a decrease in the brightness of some colors and not others, which results in a degradation of the color of the image.
• photovoltaic bands are often arranged in regular networks, that is to say that the distance between two adjacent bands is always identical and repetitive, but there is no strict relationship or wedging between the network photovoltaic bands and the array of pixels, their relative arrangement being random. As a result, some bands overlap inter-pixels and others do not, and this in a random manner, which causes alternations of image areas whose brightness is different. An optical Moire phenomenon then appears, which varies according to the angle of observation.
• the main purpose of the invention is to overcome the aforementioned drawbacks related to the state of the art.
• the invention is particularly intended to densify the surface of the photovoltaic elements positioned in front of an image, while limiting the degradation of the transparency and / or quality of the image that generally results.
• the invention consists in positioning and dimensioning, in a specific manner, opaque functional elements, in particular of the photovoltaic type, and placing them in front of an image, in such a way that these position and dimension characteristics have for effect of reduce the loss of transparency and / or the visual degradation of said image when viewed through said functional elements.
• the functional elements opaque to visible light are photovoltaic elements, it being understood that the invention extends in the case where these functional elements can be photovoltaic, or have a another function (for example an electromagnetic antenna function), or a combination of a photovoltaic function and another function.
• photovoltaic elements is defined here as surfaces, preferably having repetitive geometrical patterns, capable of transforming part of the light they receive into electricity. These photovoltaic elements may consist of any known material having this property of converting light energy into electrical energy, which is the case, for example, for crystalline, amorphous or organic silicon. These photovoltaic elements are also interconnected, and connected to external components ensuring the collection and use of electrical energy produced by electrical connections known to those skilled in the art and not described here. These photovoltaic elements may have various shapes, but to facilitate their realization by industrial means, they preferably have the form of parallel strips of small width.
• Photovoltaic strips are a preferred variant among the geometric shapes of the photovoltaic elements, the generic form of these elements being arbitrary and will be designated by the terminology of "photovoltaic zone”.
• Pixels are here included in the term colored pixels having areas of several colors, for example RGB, as well as monochrome pixels.
• the pixels may also, depending on their production technology, be backlit or electroluminescent (this is the case in particular of the so-called emissive screen pixels), or printed (this is the case in particular for printed image pixels), or again the reflective screen pixels. It may also be pixels composed of colored or monochrome crystals placed on or integrated with reflecting surfaces such as mirrors, such as crystals of the type "cholesteric liquid crystal" in English terminology, also called crystals ChLCD.
• the invention relates to a functional device, in particular of photovoltaic type, comprising in superposition a functional surface, in particular photovoltaic, semi-transparent and an image carrier, said functional surface or semi-photovoltaic transparent -transparent being composed of a set of transparency zones revealing an image and a set of opaque functional or photovoltaic zones arranged in a first regular pattern, the image being composed of pixels arranged according to a second regular pattern and of which some are covered in whole or in part by a photovoltaic zone or more generally a functional zone, characterized in that said functional or photovoltaic zones are dimensioned and are arranged relative to the pixels so that those image pixels which are covered by these areas are all covered with sensib overlay identical in position and surface.
• this design of functional elements, particularly photovoltaic optimized in terms of size and positioning, the partial overlap of a pixel always produces the same optical effect, from one covered pixel to another, which makes it possible to avoid especially the effects of Moiré.
• the invention provides in an advantageous embodiment that said first regular pattern of the photovoltaic areas is arranged according to a first constant step between areas consecutive photovoltaic, and in that said second regular pattern of pixels is arranged in a second constant pitch. But this measure alone is not enough to ensure a constant overlap of the pixels arranged in part under a photovoltaic element, since a progressive shift of the pixel arrays and networks of photovoltaic elements would occur if the two steps in question are not not closely related.
• the invention provides that said first step, that of the photovoltaic zones, is either equal to the pitch of the pixels, or constitutes a sub-multiple of this step.
• the invention being independent of the nature of the pixels, it can be implemented with any type of pixel and any type of image.
• the image carrier will advantageously be an emissive screen, in particular of the LCD type, the pixels of the image then being composed of zones of colored pixels (R, V, B) or areas of monochrome pixels.
• the image carrier may be constituted by a reflective screen, the pixels of the image then being composed of zones reflecting ambient light.
• the image medium used may be a reflective medium of electronic paper type ("e-paper" in English terminology).
• the photovoltaic device according to the invention will comprise photovoltaic zones constituted by parallel photovoltaic strips of width L 1 delimiting transparency bands of width D x, and the colored or monochrome zones of the pixels of the image will in this case also be arranged in lines separated by non-colored lines parallel to each other, of width Ip and spaced by a distance Dp, and the photovoltaic strips will be parallel to the network of parallel lines formed by the unstained lines .
• the photovoltaic strips can be active only on one side, or be active on two sides, in which case they will convert both the light coming from the outside of the device and the inner light coming from the pixels into electricity.
• the distance (Dx + Lj) between two adjacent photovoltaic strips is equal to or is a sub-multiple of the distance (Dp + Ip) between two consecutive lines of unstained areas of the image.
• the orientation of the photovoltaic strips and bands of pixels of the image, and inter-pixels on the device according to the invention may be arbitrary. Thus, these elements may form horizontal straight lines or vertical or oblique and / or broken.
• the photovoltaic device according to the invention will not be reserved for a particular technology for the production of photovoltaic strips, which may be composed in particular of crystalline silicon, amorphous, organic, and / or a plurality of thin layers.
• the technology and the nature of the pixels will not be limiting factors for the use of the invention, and the pixels of the image will be either emissive, backlit or electroluminescent, or reflective, printed or composed of colored crystals placed on or integrated with mirror surfaces.
• the inter-pixels situated between the pixels or between the colored or monochrome areas of the pixels can have multiple appearances, and will be either transparent, or of uniform color, or white, or black.
• the device according to the invention may be such that the photovoltaic zones or the photovoltaic bands as described above are respectively replaced by, or combined with, zones or functional bands of another type.
• One of the examples of useful functional elements is that in which the photovoltaic zones or bands are replaced by, in whole or in part, electrically conductive zones or bands capable of forming an electromagnetic antenna, or by semiconductor zones or strips.
• the device according to the invention will be rendered communicating electromagnetically, thanks to an antenna integrated in the device but invisible to the naked eye.
• the subject of the invention is also a screen for an electronic device, characterized in that it comprises a photovoltaic device, or more generally a functional device, as described above, this screen being able to be of the reflective type of the ambient light (the photovoltaic zones or strips being then disposed above an image formed by pixels capable of reflecting ambient light), or of light emissive type (the photovoltaic zones or strips then being disposed above an image constituted by by backlit or luminescent pixels.)
• the invention also relates to an electronic device, characterized in that it comprises a device or a screen as described above.
• the description is given as a preferred example in the case where the photovoltaic bands or zones integrated in the device are of photovoltaic type, but as indicated above, the invention extends to the integration of other functional elements into a device, provided that this integration is done according to the same rules of dimensioning and positioning with respect to the pixels of the image, as in the example described in relation to photovoltaic elements.
• FIGS. 1A, 2A and 3A are three known examples of positioning the colored areas of the pixels of an image, relative to one another.
• FIGS. 1B, 2B and 3B respectively illustrate embodiments of the invention in which photovoltaic strips are superimposed on the colored areas of FIGS. 1A, 2A, 3A, when these colored areas of the pixels and these photovoltaic strips are respectively horizontal. oblique, or both horizontal and oblique.
• FIGS. 1C, 2C and 3C illustrate an embodiment of the invention in which the distance between adjacent photovoltaic strips of the three preceding FIGS. 1B, 2B, 3B has been divided by an integer factor, namely the factor five.
• FIG. 4 is a schematic perspective exploded view of a photovoltaic device according to the invention, showing the dimensions and the relative positioning of the pixels of an image and photovoltaic strips superimposed on certain areas of the image.
• Figure 5 is a schematic view similar to Figure 4, showing the effect of a change in the viewing angle on the perception of the image by an observer.
• a transparent surface is covered with parallel photovoltaic strips (FIG. 5), the length of which is L1, the width L1, the thickness Ep and the distance separating two consecutive bands Dx .
• the width of the bands is less than the separating power of the human eye, ie 0.017 degrees, so that an observer, for example, placed 20 cm or more from the transparent surface will not perceive the bands individually but will only perceive a decrease in transparency of said surface if Lj in this example is less than 60 micrometers.
• the surface transparent which is covered with photovoltaic strips becomes semi-transparent to the human eye. This semi-transparent surface will be called a "photovoltaic plate" when it is made in the form of a thin support positioned in front of an image composed of a pixel array.
• the "photovoltaic plate” is positioned on an image where each pixel consists of three color zones Red (1) Green (2) and Blue (3).
• the regular arrangement of each of the pixels relative to each other forms an ordered array of pixels and three sub-arrays of colored areas, each of these sub-networks being composed of all the colored areas of the same color.
• Non-colored spaces are also observed between the colored zones of the same pixel, or between the colored zones of adjacent pixels, these spaces being able to form straight or broken lines, horizontal or vertical or oblique.
• These spaces which are called “non-colored” here, are spaces that do not contain colored or monochrome pixels. They can both be transparent or have a uniform color, often consisting of the color of the image medium, such as white or black. These spaces will subsequently be designated by the generic term inter-pixels.
• Each of the three subarrays of colored areas itself draws lines that can be rectilinear or triangular, horizontal, vertical or oblique.
• the photovoltaic strips are parallel to one another and positioned in front of said colored areas and in front of said non-colored spaces, and according to the invention this covering is such that the overlapping surface and the positioning of the covering of said photovoltaic strips is the same for all the colored areas. (1,2,3) of the image.
• the first consequence will be that the observer will perceive only an overall decrease in the brightness of the image without modification of its color, that is to say without the observation of a dominant color that could have appeared because that it would have been generally less covered by photovoltaic elements than other colors.
• this invention spaces the adjacent photovoltaic strips by a distance Dx such that the pitch Dx + Lj is equal to, or or a sub-multiple of, the distance Dp + Ip which is the pitch which separates the lines formed by the non-colored spaces, these lines being those which are parallel to the photovoltaic strips.
• This characteristic has the second consequence of suppressing the appearance of moire areas when the viewing angle of the device by an observer is changing.
• the modification of the viewing angle of the observer causes the apparent displacement of the photovoltaic strips with respect to the colored areas and with respect to the non-colored areas.
• This apparent displacement is done according to a parallax optical phenomenon that virtually moves the photovoltaic strips perpendicular to their length.
• some photovoltaic strips can cover unstained areas which causes an imbalance between the overlapping surfaces of each colored area and therefore a moiré optical phenomenon.
• the first step Dx + Lj between two consecutive photovoltaic strips is equal to or is a sub-multiple of the second pitch Dp + Ip between two lines of non-colored consecutive areas which are parallel to said photovoltaic bands.
• the pitch Dx + Lj between the photovoltaic strips is at least 5 times smaller than the pitch Dp + Ip between two consecutive lines of non-colored areas that are parallel to said photovoltaic strips.
• the increase in the number of photovoltaic strips that cover each colored zone implies that the width Lj of the strips is reduced by the same amount and that the moire defect which appears when, under certain observation angles, photovoltaic bands are positioned on the unstained areas.
• FIGS. 1A, 2A and 3A are three known examples of positioning the fundamental colored zones (1, 2, 3) of an image with respect to one another.
• a triplet of colors l (Red), 2 (Green), 3 (Blue) defines a pixel which is the basic constituent of the image.
• the set of colored areas (1,2,3) are arranged in an ordered network which can hang in the form: - a rectilinear mesh ( Figure 1A) whose repetitive sequence of colors within the horizontal lines is 1,2,3,1,2,3 ... and each vertical line includes the same series of color.
• the non-colored spaces separating the colored areas (1,2,3) form horizontal lines (1A1) and vertical lines (1A2) - of a crossed mesh ( Figure 2A) whose repetitive sequence inside the lines oblique is 1,3,2,1,3,2 ... and the sequence of horizontal lines is 1,2,3,1,3,1 ...
• the non-colored spaces separating the colored areas (1,2 , 3) form horizontal lines (2A2) and oblique lines (2A1).
• FIG. 3A a cross mesh (FIG. 3A) whose repetitive sequence inside the oblique lines is a series of colored zones of the same color for example
• FIGS. 1B, 2B, 3B are particular embodiments of the invention in which the photovoltaic strips partly cover the colored areas (1, 2, 3) of the three preceding figures (FIGS. 1A, 2A, 3A).
• the covering is such that the covering surface of all the colored zones (1, 2, 3) by photovoltaic material is identical in size and in position, and that the displacement of said strips perpendicular to their length does not modify this identity. This is made possible by the fact that the distance Dx + Lj which separates the photovoltaic strips is equal to the distance Dp + Ip which separates the lines from the unstained zones which are parallel to said photovoltaic bands.
• FIG. 1B illustrates the case where each photovoltaic strip (1B1, 1B2, 1B3) covers a horizontal line of colored zones (1,2,3,1,2,3 ).
• Figure 2B illustrates the case where each photovoltaic band (2B1,2B2,2B3) is oblique and covers an oblique line of colored areas (1,3,2,1,3,2 ..).
• the pitch Dx + Lj can be divided by an integer without modifying the desired image quality.
• (3B4,3B5,3B6) and (3B1,3B2,3B3) cover both rows of colored areas horizontal (1,2,3,1,2,3 7) and lines of oblique colored zones (1,1,1, ... 2,2,2 ... 3,3,3 ... ).
• FIGS. 1C, 2C, 3C are other particular embodiments of a device according to the invention, in which the pitch of the photovoltaic strips Dxx + Lj is at least five times smaller than the pitch Dp + Ip between the lines of the spaces not colored.
• FIG. 1C illustrates this particular embodiment in the case of a network with rectilinear mesh of colored zones.
• Photovoltaic bands are here horizontal (ICI) but they could also be vertical (not shown).
• FIGS. 2C and 3C illustrate the case of an oblique mesh network in which the photovoltaic strips are oblique (2C1, 3C1) and / or horizontal (3C2).
• a device consists of a rectangular transparent photovoltaic plate 80 x 60 mm and 400 ⁇ thick on which was deposited a network of parallel photovoltaic strips thin layer of amorphous silicon.
• the pitch value for the pixel array and for the photovoltaic array is the same, the positioning of the photovoltaic plate in front of the screen of the mobile phone does not cause any deterioration of the colors of the image, only an overall decrease in its image.
• brightness of 20% corresponding to the percentage of surface coverage of the photovoltaic strips.
• the invention responds well to the goals set by increasing the visual quality of an image when it is positioned behind a network of photovoltaic strips according to the rules of the invention, that is to say by dimensioning and positioning said photovoltaic strips in a specific manner with respect to the pixels and inter-pixels of the image.
• the principle and the dimensioning of the photovoltaic device according to the invention are independent of the type of image displayed, provided that it is structured in pixels in a regular pattern.
• the device according to the invention when the device according to the invention is associated with an image displayed on an electronic screen, it does not depend on the screen or image support technology used, and is equally suitable for emitting screens, for example LCD type, reflective screens, and color or monochrome displays.

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• Physics & Mathematics (AREA)
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• Chemical & Material Sciences (AREA)
• General Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Mathematical Physics (AREA)
• Crystallography & Structural Chemistry (AREA)
• Devices For Indicating Variable Information By Combining Individual Elements (AREA)
• Photovoltaic Devices (AREA)
• Electroluminescent Light Sources (AREA)
• Color Television Image Signal Generators (AREA)
• Combination Of More Than One Step In Electrophotography (AREA)
• Thermal Transfer Or Thermal Recording In General (AREA)
• Liquid Crystal (AREA)
• Health & Medical Sciences (AREA)
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• 2012
  • 2012-12-04 FR FR1203283A patent/FR2999009B1/fr active Active
• 2013
  • 2013-12-02 JP JP2015546073A patent/JP6392237B2/ja active Active
  • 2013-12-02 US US14/649,387 patent/US20150333203A1/en not_active Abandoned
  • 2013-12-02 WO PCT/FR2013/000318 patent/WO2014087059A1/fr not_active Ceased
  • 2013-12-02 EP EP13818251.4A patent/EP2929564A1/de not_active Withdrawn
  • 2013-12-02 CN CN201380072251.4A patent/CN104956258B/zh active Active
• 2016
  • 2016-12-30 US US15/395,514 patent/US20170110617A1/en not_active Abandoned

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