EP3903302A1 - Dispositif optoélectronique comprenant une diode électroluminescente dont le faisceau émis présente une incidence variable sur différents convertisseurs de couleur selon une séquence prédéterminée - Google Patents
Dispositif optoélectronique comprenant une diode électroluminescente dont le faisceau émis présente une incidence variable sur différents convertisseurs de couleur selon une séquence prédéterminéeInfo
- Publication number
- EP3903302A1 EP3903302A1 EP19848987.4A EP19848987A EP3903302A1 EP 3903302 A1 EP3903302 A1 EP 3903302A1 EP 19848987 A EP19848987 A EP 19848987A EP 3903302 A1 EP3903302 A1 EP 3903302A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- conversion
- light beam
- pad
- optoelectronic device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
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- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
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- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 description 1
- 239000002223 garnet Substances 0.000 description 1
- 230000035784 germination Effects 0.000 description 1
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- 229910052738 indium Inorganic materials 0.000 description 1
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- SIXIBASSFIFHDK-UHFFFAOYSA-N indium(3+);trisulfide Chemical compound [S-2].[S-2].[S-2].[In+3].[In+3] SIXIBASSFIFHDK-UHFFFAOYSA-N 0.000 description 1
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- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
- F21V9/45—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity by adjustment of photoluminescent elements
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/007—Use of pixel shift techniques, e.g. by mechanical shift of the physical pixels or by optical shift of the perceived pixels
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2003—Display of colours
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
- H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/15—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission
- H01L27/153—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars
- H01L27/156—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars two-dimensional arrays
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
- H01L33/504—Elements with two or more wavelength conversion materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0235—Field-sequential colour display
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
- G09G3/002—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background to project the image of a two-dimensional display, such as an array of light emitting or modulating elements or a CRT
Definitions
- TITLE Optoelectronic device comprising a light-emitting diode whose emitted beam has a variable incidence on different color converters according to a predetermined sequence
- the present invention relates to an optoelectronic device comprising a plurality of pixels, each pixel being capable of emitting light beams of different colors.
- the invention also relates to a method for controlling an optoelectronic device.
- the invention finds an application in particular in display screens or image projection systems.
- optical device is understood here to mean a device suitable for converting an electrical signal into electromagnetic radiation to be emitted, in particular light.
- LED Light-Emitting Diode
- each light-emitting diode comprises an active material exploiting or not quantum wells, a semiconductor portion doped according to a first type of doping to play the role of P doped junction and a semiconductor portion doped according to a second type of doping to play the N-doped junction role
- Each light-emitting diode can be formed on the basis of three-dimensional or planar semiconductor elements, having micrometric or even nanometric dimensions.
- optoelectronic devices comprising a matrix of light-emitting diodes distributed over a certain emission surface through which is transmitted directly or after conversion the light radiation coming from light-emitting diodes.
- Such optoelectronic devices can in particular be used in the constitution of display screens or image projection systems, where the matrix of light-emitting diodes in fact defines a matrix of light pixels where each pixel traditionally comprises at least one sub-pixel to generate each color, each sub-pixel itself containing at least one light-emitting diode .
- a sub-pixel can for example contain up to 100,000 light-emitting diodes.
- Another difficulty is to achieve that the light radiation emitted by the wired light-emitting diodes of a given sub-pixel does not mix with the light radiation emitted by the light-emitting diodes of an adjacent sub-pixel in order to improve the contrasts.
- this problem proves increasingly difficult to solve given the increasing miniaturization of light emitting diodes.
- Another difficulty stems from the fact that the light emitted by a wired three-dimensional diode is not directional in the sense that the light beams composing this light are not emitted substantially in the same direction. This results in a significant loss of radiation by emission in unwanted directions, thus causing a fall in light extraction.
- One known solution consists in forming light confinement walls capable of blocking the transmission of the light radiation emitted by at least one given light-emitting diode to at least one adjacent light-emitting diode.
- each sub-pixel comprises a light conversion module delimiting a plurality of conversion pads capable of emitting at the output of light rays of different colors respectively. It can typically be provided for the presence of at least one phosphor at the level of at least one of these conversion pads. Each conversion pad is intended to receive light from at least one light-emitting diode associated therewith.
- these manufacturing techniques are not satisfactory in view of the current demand for miniaturization.
- the present invention aims to provide an optoelectronic device, where each pixel has a multicolored light emission, responding to all or part of the problems presented above.
- one goal is to provide a solution that meets at least one of the following objectives:
- an optoelectronic device comprising a plurality of pixels, each pixel being capable of emitting light beams of different colors and comprising:
- a unique illumination mechanism comprising at least one light-emitting diode capable of emitting an initial light beam
- a light conversion module comprising a plurality of conversion pads including at least one primary conversion pad capable of emitting a first light radiation corresponding to a first color from the initial light beam and at least one secondary conversion pad able to emit a second light radiation corresponding to a second color from the initial light beam,
- a light adjustment system configured to act on at least one element chosen from a relative position between the illumination mechanism and the light conversion module and the initial light beam, the action of the light adjustment system being adapted so that the primary conversion pad and the secondary conversion pad respectively emit the first light radiation and the second light radiation from the initial light beam simultaneously or alternately in a predetermined sequence.
- the light adjustment system comprises an optical system arranged between the illumination mechanism and the light conversion module, the optical system acting on the initial light beam so as to transform it optically.
- the optical system comprises at least one optical lens arranged between the illumination mechanism and at least one conversion pad chosen from the primary conversion pad and the secondary conversion pad.
- the optical lens is configured to be traversed by the initial light beam and emit, by optical transformation of the initial light beam, a light beam transformed at least in part made directional with respect to the initial light beam and reaching at least one conversion pad chosen from the primary conversion pad and the secondary conversion pad.
- the light adjustment system comprises a lens displacement mechanism capable of ensuring a displacement of the optical lens according to a displacement sequence adapted so that the transformed light beam is incident on the primary conversion pad and on the secondary conversion pad of simultaneously or alternately according to an alternating incidence ensuring said predetermined sequence for the emission of the first and second light rays.
- the lens movement mechanism includes piezoelectric actuators and / or microactuators such as piezoelectric materials and / or electroactive polymers and / or shape memory alloys and / or magnetic actuators.
- the light adjustment system comprises transformation elements to vary an optical configuration of the optical lens influencing the manner of transforming the initial light beam and of emitting the transformed light beam, according to a sequence of variation of optical configuration adapted so that the transformed light beam is incident on the primary conversion pad and on the secondary conversion pad simultaneously or alternately according to an alternating incidence ensuring said predetermined sequence for the emission of the first and second light radiation.
- the transformation elements for varying an optical configuration of the optical lens, include piezoelectric elements in the optical lens and / or micro-actuators such as piezoelectric materials and / or electroactive polymers and / or shape memory alloys and / or magnetic actuators and / or actuable liquid crystals which the optical lens incorporates.
- the primary conversion pad and the secondary conversion pad are generally arranged in a first plane, the optical lens is generally arranged in a second plane and the illumination mechanisms of the plurality of pixels are generally distributed in a third plane, the first plane, the second plane and the third plane being substantially parallel to each other.
- the light adjustment system comprises a movement mechanism of the light conversion module acting on the light conversion module to ensure movement of the primary conversion pad and / or the secondary conversion pad according to a displacement sequence adapted so that the beam initial light or the transformed light beam is incident on the primary conversion pad and on the secondary conversion pad simultaneously or alternately according to an alternating incidence ensuring said predetermined sequence for the emission of the first and second light radiation.
- the light conversion module movement mechanism comprises piezoelectric actuators and / or microactuators such as piezoelectric materials and / or electroactive polymers and / or shape memory alloys and / or magnetic actuators .
- the light adjustment system comprises an illumination mechanism displacement mechanism capable of ensuring displacement of the illumination mechanism according to a displacement sequence adapted so that the initial light beam or the transformed light beam is incident on the conversion pad primary and on the secondary conversion pad simultaneously or alternately according to an alternating incidence ensuring said predetermined sequence for the emission of the first and second light radiation.
- the illumination mechanism displacement mechanism includes piezoelectric actuators and / or microactuators such as piezoelectric materials and / or electroactive polymers and / or shape memory alloys and / or magnetic actuators .
- the initial light beam or the transformed light beam is configured to be capable of being incident simultaneously on a part of the primary conversion pad and on a part of the secondary conversion pad.
- the light adjustment system requires that the predetermined sequence for the emission of the first and second light radiations has a frequency f for the alternation of emission of the pixel conversion pads, expressed in Hz, such that f324 * n where n is the number of pixel conversion pads.
- the light conversion module comprises at least one luminophore at the level of at least one conversion pad chosen from the primary conversion pad and the secondary conversion pad.
- the invention also relates to the implementation of a method for controlling an optoelectronic device comprising a plurality of pixels where each pixel is capable of emitting light beams of different colors and comprises: a unique illumination mechanism comprising at at least one light-emitting diode capable of emitting an initial light beam (121),
- a light conversion module comprising a plurality of conversion pads including at least one primary conversion pad capable of emitting a first light radiation corresponding to a first color from the initial light beam and at least one secondary conversion pad capable of emitting a second light radiation corresponding to a second color from the initial light beam, the method comprising a main phase comprising the following steps:
- each pixel comprises, configured to act on at least one element chosen from a relative position between the illumination mechanism and the light conversion module and the initial light beam, the activation of the light adjustment system being adapted so that the initial light beam can reach the secondary conversion pad;
- steps a) and c) being carried out simultaneously or alternately according to a predetermined sequence.
- the time period between two successive main phases is less than 0.042 s.
- FIG. 1 represents a schematic cross section of an embodiment of an optoelectronic device according to the invention containing an illumination mechanism and two separate conversion pads emitting in different colors;
- FIG. 2 shows a schematic cross section of an embodiment of an optoelectronic device according to the invention containing an illumination mechanism and three separate conversion pads emitting in different colors;
- FIG. 3 shows a schematic cross section of an embodiment of an optoelectronic device according to the invention containing an illumination mechanism, and two separate conversion pads emitting in different colors, and an optical lens;
- FIG. 4 represents, in schematic cross-section, two different configurations occupied by another embodiment of an optoelectronic device according to the invention containing a mechanism for moving the illumination mechanism, an illumination mechanism and two separate conversion pads emitting in different colors, the two configurations representing the situations before and after the actuation of the movement mechanism of the illumination mechanism;
- FIG. 5 shows, in schematic cross-section, two different configurations occupied by another embodiment of an optoelectronic device according to the invention containing a mechanism for moving the light conversion module, an illumination mechanism and two separate conversion pads emitting in different colors, the two configurations representing the situations before and after the actuation of the movement mechanism of the light conversion module;
- FIG. 6 shows, in schematic cross-section, three different configurations occupied by another embodiment of an optoelectronic device according to the invention containing an optical lens and an element for varying an optical configuration of the optical lens, the three configurations appearing different actuations of the element which varies the optical configuration of the optical lens;
- Fig. 7 shows, in schematic cross-section, two different configurations occupied by another embodiment of an optoelectronic device according to the invention containing a mechanism for moving the light conversion module, an illumination mechanism, two conversion pads emitting with two different colors and an optical lens, the two configurations corresponding to the positions occupied by the two conversion pads before and after actuation of the movement mechanism of the light conversion module.
- FIG. 8 represents, in schematic cross-section, three different configurations occupied by another embodiment of an optoelectronic device according to the invention containing an optical lens and a lens movement mechanism, the three configurations corresponding to different positions occupied by the lens by actuation of the lens moving mechanism;
- FIG. 9 shows, in a top view, three different configurations occupied by another embodiment of an optoelectronic device according to the invention containing two conversion pads emitting in different colors illuminated simultaneously and alternately by an initial light beam;
- FIG. 10 shows, in a top view, six different configurations occupied by an optoelectronic device according to the invention containing three conversion pads emitting in three different colors illuminated simultaneously and alternately by an initial light beam.
- the invention relates firstly to an optoelectronic device 10 comprising a plurality of pixels 11 where each pixel 11 is capable of emitting light beams characterized by different colors.
- each of FIGS. 1 to 10 represents only a single pixel 11 of the optoelectronic device 10. This in no way excludes the fact that the optoelectronic device 10 comprises a plurality of pixels 11, typically distributed in the manner of a matrix in two dimensions, in order to meet the needs in applications of the display screen or image projection system type.
- Each pixel 11 comprises a light conversion module 600 delimiting comprising several conversion pads, themselves capable of emitting light beams of different colors, including at least one primary conversion pad 11a and a secondary conversion pad 11b.
- the pixel 11 can also include at least one tertiary conversion pad 11c in addition to the primary and secondary conversion pads 11a, 11b.
- the number of primary conversion pads 11a, secondary conversion pads 11b or even tertiary conversion pads 11c is not limited in itself within each pixel 11.
- Each pixel 11 comprises a single illumination mechanism 222 for sequentially illuminating in time different conversion pads that the pixel 11 comprises.
- the illumination mechanism 222 essentially comprises at least one light-emitting diode 111.
- the mechanism illumination 222 may also include means for collimating light such as for example reflective or opaque walls situated on either side of said at least one light-emitting diode 111 and capable of concentrating or at least partially making the beam directional light emitted by the illumination mechanism 222 towards the conversion pads 11a, 11b, 11c.
- the illumination mechanism 222 is thus able to emit an initial light beam 121, in particular from the light beam emitted by said at least one light-emitting diode 111.
- This initial light beam 121 is then, directly or indirectly, made incident on a rear face of the various conversion pads 11a, 11b or even 11c of the pixel 11 in the simultaneous or alternating manner mentioned above.
- each pixel 11 therefore also includes the light conversion module 600 delimiting comprising the primary conversion pads 11a and secondary 11b, or even the tertiary conversion pad 11c.
- the primary conversion pad 11a is capable of emitting a first light radiation 124a corresponding to a first color from the initial light beam 121.
- the secondary conversion pad 11b is capable of emitting a second light radiation 124b corresponding to a second color from of the initial light beam 121.
- the tertiary conversion pad 11c is capable of emitting a third light radiation corresponding to a third color to starting from the initial light beam 121.
- the first, second and third colors are different from each other, so that the pixel 11 can perform the functions conventionally expected of a pixel dedicated to the light display.
- Each pixel 11 also includes a light adjustment system configured to act on the relative position of the light conversion module 600 and of the illumination mechanism 222 and / or on the initial light beam 121.
- the action of the light adjustment system is adapted so that the primary conversion pad 11a and the secondary conversion pad 11b respectively emit the first light radiation 124a and the second light radiation 124b from the initial light beam 121 simultaneously or alternated according to a predetermined sequence, the predetermined sequence being, in a nonlimiting example, repeated periodically.
- the action of the light adjustment system is adapted so that the primary conversion pad 11a, the secondary conversion pad 11b and the tertiary conversion pad 11c emit the first light radiation 124a, the second light radiation 124b and the third light radiation from the initial light beam 121 simultaneously or alternately according to a predetermined sequence.
- This predetermined sequence can, in a nonlimiting example, be repeated periodically to for example generate a color mixing effect and thus obtain an average color resulting from the sum of the colors generated at each alternation of the sequence and the generation time of each. of said colors.
- the light adjustment system and its constituent elements are for example electromagnetically and / or mechanically controlled by one or more control modules (not shown) in order to display, via the pixel matrix 11, one or more images.
- a method for controlling the optoelectronic device will moreover be described below, which can be interpreted as a method for displaying an image by piloting the optoelectronic device.
- each light-emitting diode 111 comprises semiconductor elements including a first portion doped according to a first type of doping taken from an N or P doping, a second portion forming an active part may include confinement means, and a third portion doped according to a second type of doping taken from an N or P doping.
- this active part can comprise a single quantum well.
- These semiconductor elements can be arranged, preferably in the present optoelectronic device 10, in a three-dimensional manner according to micrometric or nanometric dimensions.
- each light-emitting diode 111 typically comprises a wired, conical, frustoconical or pyramidal semiconductor element, for example a microfil or a nanowire.
- the embodiments can also be implemented for planar light-emitting diodes 111, that is to say light-emitting diodes 111 formed from a stack of planar semiconductor layers.
- each light-emitting diode 111 is connected to a first lower electrode (not shown and which may be a germination layer), formed in a substrate, continuous or not.
- a first lower electrode not shown and which may be a germination layer
- a person skilled in the art can for example refer to patent application FR-A1-3053530 for the supply of such a substrate containing the adapted lower electrodes.
- the cross section of the light emitting diodes 111 can have different shapes such as, for example, an oval, circular or polygonal shape (for example square, rectangular, triangular, hexagonal).
- the active layer of light-emitting diodes 111 is the layer from which the majority of the radiation delivered by light-emitting diode 111 is emitted. It may include means for confining the carriers of electric charge, such as quantum wells. It is, for example, made up of alternating layers of GaN and InGaN. The GaN layers can be doped. Alternatively, the active layer consists of a single layer of InGaN.
- the light-emitting diodes 111 can be obtained by any technique skilled in the art, for example: a chemical vapor deposition known as "CVD” (corresponding to the acronym of the English term “Chemical Layer Deposition” ), an atomic layer deposition known as “ALD” (corresponding to the acronym of the English term “Atomic Layer Deposition”), or a physical vapor deposition known as “PVD” (corresponding to the acronym of the English term “Physical Vapor Deposition” saxon) or by epitaxy (for example according to the so-called “MBE” technique corresponding to the acronym of the English term “Molecular Beam Epitaxy” or according to the so-called “MOVPE” technique corresponding to the acronym of Anglo-Saxon term “Metal Organic Vapor Phase Epitaxy”) or according to technique of Epitaxy in Vapor Phase with Hydrides.
- CVD chemical vapor deposition
- ALD atomic layer deposition
- PVD physical vapor deposition
- epitaxy for example according to the so
- the light-emitting diodes 111 can be, at least in part, formed from group IV semiconductor materials such as silicon or germanium or else mainly comprising a compound III-V, for example compounds III-N .
- group III include gallium, indium or aluminum.
- III-N compounds are GaN, AIN, InGaN or AlInGaN.
- Other elements of group V can also be used, for example, phosphorus, arsenic or antimony.
- the elements in compound III-V can be combined with different molar fractions.
- the light-emitting diodes 111 can equally be formed from semiconductor materials mainly comprising an II-VI compound.
- the dopant can be chosen, in the case of a compound III-V, from the group comprising a P type dopant from group II, for example magnesium, zinc, cadmium or mercury, a P type dopant from group IV for example carbon, or an N type dopant of group IV, for example silicon, germanium, selenium, sulfur, terbium or tin.
- a P type dopant from group II for example magnesium, zinc, cadmium or mercury
- P type dopant from group IV for example carbon
- an N type dopant of group IV for example silicon, germanium, selenium, sulfur, terbium or tin.
- the emission mechanism 222 can also include at least one optical lens (not shown and distinct from the optical lens 122 described below) for collimating and / or focusing and / or making as direct as possible the light radiation directly emanating from the light-emitting diodes. 111.
- the illumination mechanism 222 generates an initial light beam 121, for example resulting from the interaction of the elements mentioned above.
- the optoelectronic device 10 comprises an optical system arranged between the illumination mechanism 222 and the light conversion module 600.
- this system optical which has the role of optically transforming the initial light beam 121 in order to emit a transformed light beam 123 there may comprise at least one optical lens 122.
- the initial light beam 121 thus generated by the illumination mechanism 222 then reaches (directly in the absence of the optical system or indirectly in the case of the possible interposition of the optical system) the light conversion module 600 delimiting comprising the various conversion pads 11a, 11b or even 11c.
- the primary conversion pad 11a is capable of emitting, at an output face, the first light radiation 124a corresponding to the first color from the initial light beam 121.
- the light conversion module 600 can by example contain color converters such as phosphors at the level delimiting the primary conversion pad lia.
- the color converters emit in their turn on the front face a first light radiation 124a of a preferentially different wavelength determined by their intrinsic nature.
- the secondary conversion pads 11b and the tertiary conversion pads 11c by adapting the color converters contained in the light conversion module 600 to the level of the secondary conversion pads 11b and tertiary 11c.
- the light conversion module 600 does not contain a color converter and / or is transparent to the initial light beam 121 or to the transformed light beam 123 possibly transformed by the optical system described below.
- each photoluminescent pad is designed so as to absorb at least part of the light, for example of blue color, emanating from the mechanism of illumination 222 and to emit in response a light of different color, for example green or red.
- photoluminescent pads are usually arranged in a photosensitive binder matrix suitable, for example made of silicone.
- the photoluminescent pads can be formed from an aluminate, a silicate, a nitride, a fluoride or sulfide.
- the average size of such photoluminescent studs is between 1 pm and 20 pm, preferably between 1 pm and 10 pm, even more preferably between 1 pm and 8 pm.
- the photoluminescent studs comprise an aluminate, in particular an aluminum and yttrium garnet, for example according to the formula Y 3 Al 5 0i 2 : Ce (also known by the formula YAG: Ce or YAG: Ce3 +), (Y, Gd) 3 AI 5 0i: Ce, Tb 3 AI 5 0i 2 , (Y, Tb) 3 AI 5 0i 2 , Lu 3 AI 5 0i 2 : Ce and Y 3 (AI, Ga) 5 0i 2 .
- this aluminate also comprises elements chosen from elements comprising rare earths, alkaline earths and transition metals such as cerium, samarium, gadolinium, silicon, barium, terbium, strontium , chromium, praseodymium and gallium.
- Nitrides absorbing and emitting light in the desired wavelength ranges can also be used, for example materials of the type CaAISiN 3 : Eu, (Ca, Sr) AISiN 3 : Eu, Ca 2 Si 5 Ns: Eu or (Ca, Sr) If 5 Ns: Eu.
- the light-absorbing and emitting fluorides are for example the materials of formula K 2 MF 6 : Mn (where M can be Si, Ge, Sn or Ti).
- the light-absorbing and emitting sulfides are for example the materials of formula CaS: Eu, SrCa: Eu, (Sr, Ca) S: Eu and SrGa 2 S 4 : Eu.
- the light absorbing and emitting silicates are for example the materials of formula (Sr, Ba) 2 Si0 4 : Eu, Sr 2 Si0 4 : Eu, Ba 2 Si0 4 : Eu, Ca 2 Si0 4 : Eu, Ca 3 SiOs : Eu and Sr 3 SiOs: Eu.
- the photoluminescent studs comprise nanometric-sized crystals and are formed in a semiconductor material.
- the photoluminescent pads are then semiconductor nanocrystals whose average size is between 0.5 nm and 1000 nm, preferably from 0.5 nm to 500 nm, even more preferably from 1 nm to 100 nm, in particular from 2 nm to 30 nm. For dimensions less than 50 nm, the photoconversion properties of semiconductor nanocrystals essentially depend on quantum confinement phenomena. The semiconductor nanocrystals then correspond to quantum dots.
- the semiconductor material of each semiconductor nanocrystal is chosen from the group comprising cadmium selenide (CdSe), indium phosphide (InP), cadmium sulfide (CdS), zinc sulfide (ZnS ), zinc selenide (ZnSe), cadmium telluride (CdTe), zinc telluride (ZnTe), cadmium oxide (CdO), zinc and cadmium oxide (ZnCdO), zinc and cadmium (CdZnS), zinc and cadmium selenide (CdZnSe), silver and indium sulphide (AglnS 2 ), perovskites of the PbScX 3 type, where X is a halogen atom, in particular iodine (I), bromine (Br) or chlorine (Cl), and a mixture of at least two of these compounds.
- X is a halogen atom, in particular iodine (I),
- the dimensions of the semiconductor nanocrystals are chosen as a function of the wavelength sought for the radiation emitted by the semiconductor nanocrystals.
- cadmium selenide nanocrystals whose average size is around 3.6 nm are suitable for converting blue light to red light and cadmium selenide nanocrystals whose average size is around 1.3 nm are suitable for converting blue light into green light.
- the primary conversion pad 11a and the secondary conversion pad 11b can emit the first light radiation 124a and the second light radiation 124b from the initial light beam 121 simultaneously and possibly statically over time. This advantageously saves energy.
- the predetermined sequence which is optionally repeated periodically, can include the following subsequences:
- the first period of time during which the subsequence i) is implemented, the second period of time during which the subsequence ii) is implemented implemented, the possible third period of time during which the sub-sequence iii) is implemented and the possible period of time during which the sub-sequence iv) is implemented can be identical to each other or different others.
- the predetermined sequence which can be repeated periodically may optionally further comprise a sub-sequence corresponding to a stopping of the light emission by the illumination mechanism 222 for a certain period of time between the sub-sequence i) and the sub- sequence ii) and / or between the sub-sequence ii) and the sub-sequence iii) and / or between the sub-sequence iii) and the sub-sequence iv).
- FIG. 1 illustrates an embodiment in which the pixel 11 respectively comprises a primary conversion pad 11a and a secondary conversion pad 11b, the assembly occupying a configuration, given solely by way of example, which consists in illuminating the pad primary conversion 11a, by direct incidence on its rear face, by the initial light beam 121 emanating from the illumination mechanism 222.
- FIG. 2 illustrates another embodiment where the pixel 11 respectively comprises a primary conversion pad 11a, a secondary conversion pad 11b and a tertiary conversion pad 11c (which remains optional), the assembly occupying a configuration, given only by way of example, which consists of an illumination of the secondary conversion pad 11b, by direct incidence on its rear face, by the initial light beam 121 emanating from the illumination mechanism 222.
- Opaque walls can be formed between the conversion pads 11a, 11b, 11c so as to prevent the first, second and optionally third radiations 124a, 124b from interfering with each other.
- each pixel 11 acts mechanically on the light conversion module 600, at the level of the zones which delimit the conversion pads 11a, 11b or even 11c or more preferably on a support on which would be fixed the conversion pads, then allowing them to move in solidarity.
- the mechanical action can be practiced by deformation or, more advantageously, by displacement.
- the light adjustment system that each pixel 11 comprises can include a mechanism for movement of the light conversion module 300 acting on the light conversion module 600 to ensure movement of the primary conversion block 11a and / or the secondary conversion block 11b, or even also of the tertiary conversion block 11c when the light conversion module 600 of pixel 11 delimits one in addition to the conversion pads 11a, 11b.
- This displacement is then practiced according to a displacement sequence adapted so that the initial light beam 121 or the transformed light beam 123 described below is, sequentially, incident on the primary conversion pad 11a and on the secondary conversion pad 11b , or even on the tertiary conversion pad 11c, according to an alternating incidence ensuring said predetermined sequence for the emission of the first light radiation 124a emitted by the primary conversion pad 11a and the second light radiation 124b emitted by the secondary conversion pad 11b, or even the third light radiation emitted by the tertiary conversion pad 11c.
- the light conversion module displacement mechanism 300 provides for a displacement of the conversion pads of pixel 11 according to an overall movement during which they remain fixed with respect to each other within the same pixel 11, or alternatively according to a movement selective where part of the conversion pads of pixel 11 move relative to the remaining conversion pads of the same pixel 11.
- the movement mechanism of light conversion module 300 provides for a displacement of the conversion pads of pixel 11 as well as adjacent pixel conversion pads, collectively.
- the movement mechanism of the light conversion module 300 comprises piezoelectric actuators and / or microactuators such as piezoelectric materials and / or electroactive polymers and / or alloys with shape memory and / or magnetic actuators.
- the primary conversion pad 11a and the secondary conversion pad 11b are generally arranged in a first plane PI and the illumination mechanism 222 is arranged in a plane P3.
- the planes PI and P3 are generally parallel.
- the light conversion module displacement mechanism 300 it suffices to provide for the light conversion module displacement mechanism 300 to cause the light conversion module 600 to move generally parallel to the plane PI so that the conversion pads 11a, 11b, 11c are illuminated by the initial light beam 121 or the light beam transformed 123 sequentially, this incidence sequence of the light beam 121 or 123 being directly dependent on the movement sequence imposed on the light conversion module 600 by the movement mechanism of the light conversion module 300 in the plane PI.
- the initial light beam 121 or the transformed beam 123 can also, for example, simultaneously illuminate, and in one example statically over time, only part of the one of the conversion pads 11a, 11b, 11c of the pixel and a part of at least one other of the conversion pads 11a, 11b, 11c of the same pixel 11.
- These arrangements can be obtained by adapting the surface of incidence of the beam initial light 121 or of the transformed light beam 123, in particular by playing on all the optical parameters having an effect on this surface of incidence.
- the illumination by the initial light beam 121 of the conversion pads 11a, 11b can be governed by a predetermined sequence.
- Another example to obtain a mixed color is to implement a displacement of the light conversion module 600 between two phases of the predetermined sequence. It is then advantageously possible to obtain a color which will appear, for the human eye, for example as an average of the colors of the first and second rays 124a, 124b obtained by the sequenced illumination of the primary and secondary conversion pads 11a, 11b .
- the time period between two phases of implementation of the predetermined sequence is less than or equal to l / (24 * n) seconds, where n is the number of pads lighted conversion of pixel 11.
- the light adjustment system requires that the predetermined sequence for the emission of the first light radiation 124a emitted by the primary conversion pad 11a, of the second light radiation 124b emitted by the secondary conversion pad 11b or even the third light radiation emitted by the tertiary conversion pad 11c, has a frequency denoted f for the transmission alternations of the conversion pads of the pixel 11, expressed in Hz, such as f324 * n.
- the illumination mechanism 222 can completely maintain its illumination between two alternations of the predetermined sequence and / or between two successive phases of implementation of the predetermined sequence, so as not to jerk the display and limit the times of transition between power supply and illumination.
- the optical system arranged between the illumination mechanism 222 and the light conversion module 600 can comprise at least one optical lens 122 arranged between the illumination mechanism 222 and at least one conversion pad chosen from the conversion pad primary 11a and the secondary conversion pad 11b, or even the tertiary conversion pad 11c in the case where the light conversion module 600 of the pixel 11 delimits a tertiary conversion pad 11c in addition to the primary and secondary conversion pads 11a.
- the optical lens 122 is configured to be traversed by the initial light beam 121 and emit, by transformation of the initial light beam
- the transformed light beam 123 at least partly rendered directional with respect to the initial light beam 121.
- the transformed light beam 123 is capable of reaching at least one conversion pad chosen from the primary conversion pad 11a and the secondary conversion pad 11b, or even the tertiary conversion pad 11c.
- the optical lens 122 comprises at least one surface of convex shape having an external entry surface capable of being traversed by said initial light beam 121 coming from the illumination mechanism 222.
- the optical lens 122 can for example also contain a second convex exit surface for focusing again or collimating the initial light beam 123 and emitting the transformed beam 123.
- the optical lens 122 has an axis of revolution.
- the optical lens 122 can for example have a convex shape which is overstepped or else have a truncated part along a plane substantially parallel to the plane PI.
- the optical lens 122 is advantageously formed from a material with an optical index of between 1.4 and 2 and more preferably between 1.45 and 1.55.
- the optical lens 122 can for example be formed from borosilicate, glass, silica S1O2, AhO3, sapphire, polymer, thermoformable polymer, photosensitive resin, plastic, or even a liquid. The use of an optical lens
- the 122 advantageously makes it possible to increase the light extraction from the illumination mechanism 222 because, in the absence of an optical lens 122, part of the light emitted by the illumination mechanism 222 does not reach at least one of the pads conversion 11a, 11b, 11c. This also allows an increase in the light intensity emitted by an illumination mechanism 222 comprising one or more light-emitting diodes 11 of wire-like forms. Indeed, thanks to the use of an optical lens 122, it is possible to envisage increasing the diameter of the light-emitting diodes 111 which make up the illumination mechanism 222.
- the light rays coming from the light-emitting diode 111 as directional as possible, the light rays no longer interfere and therefore the density of light-emitting diodes 111 can be high while providing a diameter of the light emitting diodes 111 high if necessary.
- This configuration is also advantageous for precisely controlling the portions of conversion pad reached by the transformed light beam 123.
- the ratio of the areas illuminated of each conversion pad by the transformed light beam 123 in the same pixel 11, and the color as a result are precisely obtained.
- this makes it possible to obtain colors whose saturation is improved. It also reduces crosstalk between pixels and improves contrast.
- the optoelectronic device 10 may include elements, in particular absorbent walls, the implementation of which by the skilled person is easy, making it possible to block stray light rays so that they do not go in the direction of other neighboring pixels.
- the light adjustment system that each pixel 11 comprises acts optically on the optical lens 122.
- the optical lens 122 is capable of being dynamically deformed.
- the light adjustment system may include transformation elements 400 capable of varying an optical configuration of the optical lens 122 influencing the manner of transforming the initial light beam 121 and emitting the transformed light beam 123, according to a sequence of variation of optical configuration adapted so that the transformed light beam 123 is, in a sequenced manner, incident on the primary conversion pad 11a and on the secondary conversion pad 11b, or even also on the tertiary conversion pad 11c when the light conversion module 600 of pixel 11 delimits one in addition to the conversion pads 11a, 11b, according to an alternating incidence ensuring said predetermined sequence for the emission of the first light radiation 124a emitted by the primary conversion pad 11a and of the second light radiation 124b emitted by the secondary conversion pad 11b, or even the third light radiation emitted by r the tertiary conversion pad 11c.
- the initial light beam 121 can thus be deflected or focused or undergo collimation by the deformation of the optical lens 122.
- the optical lens 122 can for example be formed in one or more liquids and include electrodes or piezoelectric elements and / or microactuators such as piezoelectric materials and / or electroactive polymers and / or shape memory alloys and / or magnetic actuators. It can also include liquid crystals, capable of being actuated by electrical power in a manner ensuring the deformation of the optical lens 122 as a whole.
- FIG. 6 shows several optical configurations of the optical lens 122, making it possible to describe a predetermined sequence of illumination of the conversion pads 11a, 11b.
- the optical lens 122 in a first optical configuration, has a shape such that the transformed light beam 123 illuminates the secondary conversion pad 11b.
- the optical lens 122 in a second optical configuration, has a shape such that the transformed light beam 123 illuminates the secondary conversion pad 11b in part as well as the primary conversion pad 11a in part.
- the optical lens 122 has a shape such that the transformed light beam 123 only illuminates the primary conversion pad 11a.
- the optical lens 122 can be composed of several lenses, for example arranged parallel to the plane PI.
- the optical lens 122 can be composed of several lenses, for example arranged parallel to the plane PI.
- a first spherical optical lens and a second truncated optical lens it is possible to make the light rays of the initial light beam 121 parallel then to focus them.
- the light adjustment system of the pixel 11 provides for acting optically on the optical system by means of a mechanical action on the optical lens 122.
- the transformation elements 400 capable of varying an optical configuration of the optical lens 122 include a lens displacement mechanism 500 capable of ensuring displacement of the optical lens 122.
- the transformed light beam 123 is incident on the area of the light conversion module 600 delimiting the primary conversion pad 11a.
- the transformed light beam 123 becomes incident both on a part of the area of the light conversion module 600 delimiting the primary conversion pad 11a and on a portion of the area of the light conversion module 600 delimiting the secondary conversion pad 11b, thus causing the emission by the light conversion module 600 of a mixed color corresponding to a mixture of the light radiations 124a and 124b in proportion to their area illuminated by the transformed light beam 123 and possibly their emission times.
- the transformed light beam 123 becomes incident only on the area of the light conversion module 600 delimiting the secondary conversion pad 11b, thus creating a color corresponding to that emitted by the secondary conversion pad 11b, that is to say the second light radiation 124b.
- the sequence of displacement of the optical lens 122 generated by the action of the mechanism of displacement of the lens 500 is thus adapted so that the transformed light beam 123 is, in a sequenced manner, incident on the primary conversion pad 11a and on the pad of secondary conversion 11b, or even on the tertiary conversion pad 11c in the case where the light conversion module 600 of the pixel 11 delimits a tertiary conversion pad 11c in addition to the primary and secondary conversion pads 11a, 11b, according to an alternation of incidence ensuring said predetermined sequence for the emission of the first light radiation 124a emitted by the primary conversion pad 11a and the second light radiation 124b emitted by the secondary conversion pad 11b, or even the third light radiation emitted by the tertiary conversion pad 11c.
- These principles described in association with the particular case of a pixel 11 with two conversion pads 11a, 11b can entirely be adapted and extended to the case of a pixel 11 with three conversion pads 11a, 11b, 11c or more.
- each optical lens 122 moves independently for each pixel.
- the lens movement mechanism 500 includes piezoelectric actuators and / or microactuators such as piezoelectric materials and / or electroactive polymers and / or shape memory alloys and / or magnetic actuators.
- the optical lens 122 is generally arranged in a second plane P2 substantially parallel to the planes PI and P3 which are already substantially parallel to each other.
- the lens movement mechanism 500 causes the optical lens 122 to move generally parallel to the planes PI, P2 so that the conversion pads 11a, 11b, 11c are illuminated by the initial light beam 121 or the beam transformed light 123 sequentially, this incidence sequence of the light beam 121 or 123 being directly dependent on the movement sequence imposed on the optical lens 122 by the lens movement mechanism 500 in the plane P2.
- the light adjustment system that each pixel 11 includes provides for mechanical action on the illumination mechanism 222. If this mechanical action can possibly be obtained by a principle of deformation of all or part of the optoelectronic device 10, it is advantageous to provide a mechanical action on the illumination mechanism 222 by an overall displacement of the latter.
- the light adjustment system of each pixel 11 can comprise a mechanism for displacing the illumination mechanism 200 capable of ensuring a displacement of the illumination mechanism 222.
- the displacement of the illumination mechanism 200 can make it possible to carry out a sequence adapted so that the initial light beam 121 or the transformed light beam 123 are, simultaneously or alternately, incidents on the primary conversion pad 11a and on the secondary conversion pad 11b, or even on the tertiary conversion pad 11c in the case where the light conversion module 600 of the pixel 11 delimits a tertiary conversion pad 11c in addition to the primary and secondary conversion pads 11a, 11b, according to an alternating incidence ensuring the predetermined sequence for the emission of the first light radiation 124a emitted by the primary conversion pad 11a and the second light radiation 124b emitted by the secondary conversion pad 11b, or even from the third e light radiation emitted by the tertiary conversion pad 11c.
- These principles described in association with the particular case of a pixel 11 with two conversion pads 11a, 11b can entirely be adapted and extended to the case of a pixel 11 with three conversion pads 11a, 11b, 11c or more.
- the illumination mechanism displacement mechanism 200 includes piezoelectric actuators and / or microactuators such as piezoelectric materials and / or electroactive polymers and / or shape memory alloys and / or actuators magnetic.
- the invention also relates to the method for controlling this optoelectronic device 10.
- the light display method of the optoelectronic device 10 comprises a main phase, optionally repeated periodically over time, comprising the following steps:
- Steps a) and c) are carried out simultaneously or alternately according to a predetermined sequence. In the embodiment where steps a) and c) are performed simultaneously, then step b) may not be performed.
- step a on reading all the previous explanations related to the optional existence of the optical system arranged between the illumination mechanism 222 and the light conversion module 600, it is understood that either the initial light beam 121 directly reaches the primary conversion pad 11a to cause the emission of the first light radiation 124a, ie the initial light beam 121 is transformed by the optical system to emit a transformed light beam 123 and it is this transformed light beam 123 which reaches the primary conversion pad 11a to cause the emission of the first light radiation 124a.
- step c) it is understood that either the initial light beam 121 directly reaches the secondary conversion pad 11b to cause the emission of the second light radiation 124b, or the initial light beam 121 is transformed by the optical system for emitting a transformed light beam 123 and it is this transformed light beam 123 which reaches the secondary conversion pad 11b to cause the emission of the second light radiation 124b.
- the time period between two successive main phases is less than 0.042 s. This makes it possible to make the ignition transitions from one conversion pad to another conversion visually invisible to the human eye in the case where the pixel 11 comprises at least three conversion pads emitting in different colors (example in blue, in red and in green).
- the main phase optionally repeated periodically comprises the following steps d) and e):
- step e it is understood that either the initial light beam 121 directly reaches the tertiary conversion pad 11c to cause the emission of the third light radiation, or the initial light beam 121 is transformed by the optical system to emit a transformed light beam 123 and it is this transformed light beam 123 which reaches the tertiary conversion pad 11c to cause the emission of the third light radiation.
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Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1874317A FR3091403B1 (fr) | 2018-12-28 | 2018-12-28 | Dispositif optoélectronique comprenant une diode électroluminescente dont le faisceau émis présente une incidence variable sur différents convertisseurs de couleur selon une séquence prédéterminée |
PCT/FR2019/053288 WO2020136348A1 (fr) | 2018-12-28 | 2019-12-23 | Dispositif optoélectronique comprenant une diode électroluminescente dont le faisceau émis présente une incidence variable sur différents convertisseurs de couleur selon une séquence prédéterminée |
Publications (1)
Publication Number | Publication Date |
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EP3903302A1 true EP3903302A1 (fr) | 2021-11-03 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP19848987.4A Pending EP3903302A1 (fr) | 2018-12-28 | 2019-12-23 | Dispositif optoélectronique comprenant une diode électroluminescente dont le faisceau émis présente une incidence variable sur différents convertisseurs de couleur selon une séquence prédéterminée |
Country Status (4)
Country | Link |
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US (1) | US12013114B2 (fr) |
EP (1) | EP3903302A1 (fr) |
FR (1) | FR3091403B1 (fr) |
WO (1) | WO2020136348A1 (fr) |
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WO2023089565A1 (fr) * | 2021-11-18 | 2023-05-25 | Hyperlume, Inc. | Afficheur à micro-del coencapsulée avec optique et procédé de fabrication |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US9923124B2 (en) * | 2011-01-31 | 2018-03-20 | Mohammad A Mazed | Display device |
US9225972B2 (en) * | 2012-08-10 | 2015-12-29 | Pixtronix, Inc. | Three dimensional (3D) image generation using electromechanical display elements |
US9998717B2 (en) * | 2014-12-24 | 2018-06-12 | Prysm, Inc. | Scanning beam display system |
FR3053530B1 (fr) | 2016-06-30 | 2018-07-27 | Aledia | Dispositif optoelectronique a pixels a contraste et luminance ameliores |
JP6873737B2 (ja) * | 2017-02-23 | 2021-05-19 | 株式会社ジャパンディスプレイ | 表示装置及び照明装置 |
-
2018
- 2018-12-28 FR FR1874317A patent/FR3091403B1/fr active Active
-
2019
- 2019-12-23 WO PCT/FR2019/053288 patent/WO2020136348A1/fr unknown
- 2019-12-23 EP EP19848987.4A patent/EP3903302A1/fr active Pending
- 2019-12-23 US US17/418,482 patent/US12013114B2/en active Active
Also Published As
Publication number | Publication date |
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FR3091403A1 (fr) | 2020-07-03 |
US12013114B2 (en) | 2024-06-18 |
WO2020136348A1 (fr) | 2020-07-02 |
FR3091403B1 (fr) | 2020-12-18 |
US20220074572A1 (en) | 2022-03-10 |
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