EP3765307B1 - Dokument und verfahren zur erzeugung eines farbbildes - Google Patents

Dokument und verfahren zur erzeugung eines farbbildes Download PDF

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Publication number
EP3765307B1
EP3765307B1 EP19717539.1A EP19717539A EP3765307B1 EP 3765307 B1 EP3765307 B1 EP 3765307B1 EP 19717539 A EP19717539 A EP 19717539A EP 3765307 B1 EP3765307 B1 EP 3765307B1
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EP
European Patent Office
Prior art keywords
pixels
sub
pixel
lens
lenses
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EP19717539.1A
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English (en)
French (fr)
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EP3765307A1 (de
Inventor
Benoît BERTHE
Coralie VANDROUX
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Idemia France SAS
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Idemia France SAS
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/324—Reliefs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/351—Translucent or partly translucent parts, e.g. windows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/41—Marking using electromagnetic radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/43—Marking by removal of material
    • B42D25/435—Marking by removal of material using electromagnetic radiation, e.g. laser
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/43—Marking by removal of material
    • B42D25/44—Marking by removal of material using mechanical means, e.g. engraving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers

Definitions

  • the invention relates to the field of color image formation and more particularly relates to a document capable of generating a personalized color image and a method of generating a color image.
  • the invention finds particular applications in the formation of identity images in identity documents such as official documents: identity cards, credit cards, passports, driving licenses, secure entry badges, etc.
  • the color imaging techniques used today do not always provide satisfactory visual rendering quality. Problems arise in particular when the imaging techniques used are limited in their ability to saturate certain colors. In other words, the color gamut (ability to reproduce a range of colors) of known color imaging techniques is sometimes limited.
  • an identity image When, for example, an identity image is created on a document, it is generally composed of a face surrounded by a light, or even white, area, constituting the image background. It is not always possible to obtain sufficiently saturated colors on the face area or on the background, so that this same face placed on a monochrome background for example, and not sufficiently light, presents a satisfactory contrast between this face and the background fully satisfactory for the observer.
  • the document FR 3 030 851 A1 discloses a security device and a method for manufacturing such a security device comprising a first color pattern visible along an associated vision axis ⁇ and at least one second color pattern visible along an associated vision axis ⁇ , comprising the following steps: assembling an image layer capable of forming at least one color pattern by laser engraving, above a support, - laser engraving in the image layer of the first color pattern, along its associated vision axis, such that it can be seen through a lenticular network, - for each of said at least one second color pattern, laser engraving in the image layer, of said at least one second color pattern, along its associated vision axis, such that it can be seen through a lenticular network.
  • the document EP 2 727742 A1 discloses a secure element for securing documents, the secure element comprising a lenticular image for representing two or more target images without change in scale.
  • the document GB 2 553 104 describes the formation of multiple images using masks and lens arrays.
  • the invention aims in particular to remedy the drawbacks and inadequacies of the state of the art mentioned above.
  • the present invention relates to a document capable of generating an image color, as defined in claim 1.
  • the invention advantageously makes it possible, thanks to the lenses, to create shades of colors so as to form a color image by the interaction between the lens array and the set of pixels.
  • the color image is therefore formed by the combination of the lens array and the set of pixels located opposite.
  • the set of pixels constitutes only a blank arrangement of color pixels insofar as this set is devoid of the information characterizing the color image.
  • the lens array which is configured, according to the chosen arrangement of sub-pixels, to personalize the visual appearance of the pixels and thus generate, by juxtaposition of the visual appearances of the pixels, the final color image.
  • the lenses shape, positioning, etc.
  • it is possible to configure the lenses so as to select certain colors among the different colors present in the set of pixels.
  • the invention makes it possible in particular to generate a highly saturated color zone in the desired color or even desaturated in the particular case where the targeted subpixel is white.
  • the invention thus makes it possible to form monochrome image areas of good quality, while ensuring a high level of complexity guaranteeing the security of the image against fraud.
  • the invention makes it possible, for example, to produce a highly saturated or desaturated image background in a given color, such as white for example.
  • each pixel of said set of pixels forms an identical pattern of color sub-pixels.
  • the pixel array is configured such that the subpixels are uniformly distributed on or in the substrate.
  • each pixel of said set of pixels is configured such that each subpixel has a unique color in said pixel.
  • the invention proposes to manufacture personalized color images that are highly secure and that have good image quality.
  • the invention implements a device capable of generating a color image, comprising: a set of pixels printed on or in a substrate, each pixel forming a pattern comprising an arrangement of sub-pixels of at least two different colors; and a lens array arranged opposite the set of pixels so as to generate the color image by focusing or diverging incident light through the lenses onto at least some of the subpixels.
  • each lens can be positioned (or configured), relative to an associated pixel located opposite, to focus or diverge the incident light on at least one of the sub-pixels of said associated pixel so as to modify the contribution of the respective color of at least one sub-pixel of the associated pixel, in a region of the color image corresponding to said pixel, relative to the respective color contribution of each other sub-pixel of said associated pixel.
  • each lens array makes it possible to create shades of color, so as to form a unique color image, specific to each array and distinct from the pattern of pixels.
  • the invention also relates to a corresponding method for manufacturing (or generating) a color image.
  • FIG. 1 schematically represents a device 2 according to an exemplary embodiment of the invention.
  • the device 2 is a document comprising an identity image 6 formed in or on a device body (or substrate) 4.
  • the document 2 takes the form of a card although other embodiments are possible.
  • FIG 2 is a sectional view schematically representing the color image 6 formed in the document 2 shown in figure 1 , according to a particular embodiment. More particularly, the document 2 comprises a substrate 12 in or on which is arranged an array (or arrangement) of LN lenses.
  • the substrate 12 is transparent here in order to allow at least partial passage of incident light through the lenses LN so as to reach the color pixels 20.
  • the pixels 20, and more particularly their sub-pixels 22, comprise in this example a reflective surface 23 located under the sub-pixels to reflect (at least partially) the incident light received through the array of lenses LN.
  • This reflective surface is for example a white surface.
  • the lens array LN is arranged opposite the set of pixels 20 so as to generate the color image 6 ( figure 1 ) by focusing or diverging incident light through the LN lenses onto at least a portion of the subpixels 22.
  • the lenses may be configured in different ways and, in particular, may be convergent and/or divergent depending on the specific case.
  • the LN lenses are convergent to converge the incident light onto at least one of the subpixels 22 of the associated pixels 20 located opposite each other.
  • each lens LN is positioned, relative to a pixel 20 located opposite, called an “associated” pixel, to focus or diverge the incident light onto at least one of the sub-pixels 22 of the associated pixel 20 so as to modify the contribution of the respective colors of the sub-pixels 22 of the associated pixel 20, in a region of the corresponding color image 6 (i.e. generated through this lens LN), relative to the pattern formed intrinsically by the associated pixel 20 independently of said lens LN.
  • the LN lenses are configured to converge or diverge the incident light on certain subpixels 22 so as to make the image appear (reveal).
  • the LN lenses thus make it possible to create shades of color so as to form a color image 6 by the optical interaction between the LN lens array and the set of pixels 20.
  • the color image 6 is therefore formed by the combination of the LN lens array and the set of pixels 20 located opposite.
  • the set of pixels 20 constitutes only a blank arrangement of color pixels insofar as this set is devoid of the information characterizing the color image 6.
  • It is the LN lens array which is configured, according to the chosen arrangement of sub-pixels 22, to personalize the visual appearance of the pixels 20 and thus generate, by juxtaposition of the visual appearances of the pixels, the final color image 6.
  • LN lenses shape, positioning, etc.
  • opacifying elements black or dark, for example
  • certain sub-pixels 22 it is possible to further add opacifying elements (black or dark, for example) opposite certain sub-pixels 22 in order to create gray levels of the resulting color image 6, and thus generate contrast in the color image after the alignment of the lenses on the appropriate sub-pixels has selected an appropriate tint.
  • the LN lenses arranged opposite the set of pixels 20 may have various shapes, dimensions and configurations (magnifying power, convergent or divergent, etc.). Depending on the specific case, the LN lenses may for example be spheroidal or cylindrical, for example.
  • each pixel of the set of pixels 20 may form an identical pattern of colored sub-pixels 22.
  • the set of pixels consists of a single pattern of sub-pixels which is repeated one after the other. plurality of times. This arrangement of subpixels is called "virgin" in the sense that it does not intrinsically form (i.e. without the addition of the LN lenses and/or the opacifying elements) the color image 6.
  • each pixel 20 has an identical pattern of sub-pixels 22 in the same orientation across the set of pixels 20. It is thus possible to distribute the color sub-pixels identically in the set of pixels (as illustrated for example in Figure 3A ), which makes lens formation easier since the same frame of reference (or arrangement) is used in each pixel.
  • each pixel 20 has an identical pattern of sub-pixels 22, variations in the orientation of this pattern being however made between certain pixels relative to each other, across the set of pixels 20.
  • the same pattern of colored sub-pixels 22 is then found in all the pixels 20 of said set but following at least two different orientations (for example by applying rotations of 90° and/or 180° on the same pattern which is repeated across the set of pixels 20).
  • Figure 3C thus illustrates an example in which the same pattern of color subpixels 22a-22d is found in two different orientations (180° rotation) in the set of pixels 20.
  • This variant thus makes it possible to form a blank set of color subpixels offering the flexibility necessary to generate any image through the LN lenses, while making it possible to incorporate the same pattern in variable orientations to form, for example, a signature or a secure element, specific to each color image, which is difficult to reproduce and easily detectable in the event of fraud.
  • the pixel array 20 may be configured such that the subpixels are uniformly distributed on or in the substrate 12.
  • the pixel array may form a regular or periodic arrangement of pixels 22, forming identical or non-identical subpixel patterns as the case may be.
  • the set of pixels 20 can form a pixel matrix, consisting of rows and columns of sub-pixels 22. These rows and columns can be rectilinear and possibly orthogonal to each other.
  • each pixel 20 forms a pattern composing an arrangement of sub-pixels 22 of at least two different colors, the probability density of the presence of each sub-pixel color being constant in the pixels. 20 of the pixel arrangement.
  • the surface proportion of each color is identical in each pixel 20 of the set of pixels.
  • each pixel 20 can thus have an identical pattern of color subpixels 22 in the same orientation across the pixel arrangement 20 or, possibly, in an orientation that varies in the pixel arrangement 20 (according to random variations or according to regular or other variations).
  • a random arrangement of the pixels 20 is possible. It is in particular possible to organize the distribution of the sub-pixels 22 randomly but in such a way that the probability density of the presence of each sub-pixel color is constant in the pixels 20 of the set of pixels. In this case, it is necessary that, in a given area of the pixel arrangement 20, it is possible to select using the lenses LN the desired color or colors even if the corresponding sub-pixels are not exactly at their supposed theoretical coordinates.
  • each pixel 20 of the set of pixels is configured such that each of the sub-pixels 22 has a unique color in said pixel 20.
  • a pixel 20 can thus be composed of a plurality of sub-pixels 22, all of a distinct color.
  • each pixel 20 comprises subpixels 22 in the primary colors red/green/blue (RGB), with optional white, or in the primary colors yellow/magenta/cyan, with optional white.
  • RGB red/green/blue
  • a white area may optionally be provided in the pixel arrangement 22 between the rows and columns of subpixels 22 to avoid color overlap.
  • FIG. 3A is a top view showing a set of pixels 20 according to a particular embodiment.
  • the tiling forms a matrix of rows and columns of pixels, orthogonal to each other.
  • Each pixel 20, of square shape forms a pattern composed of 4 sub-pixels 22, denoted 22a to 22d, also of square shape.
  • the sub-pixels 22 all have a single color in the pixel 20 considered.
  • the pixels 20 are uniformly distributed so that the same pattern of sub-pixels 22 is periodically repeated in a region of the substrate 12.
  • FIG. 3B is a top view showing another example of a regular tiling in which each pixel 20 is composed of 3 sub-pixels 22, denoted 22a to 22c, each of a distinct color.
  • the sub-pixels 22 are here hexagonal in shape.
  • FIG. 3C is a top view showing another example of a regular tiling in which each pixel 20 is composed of 4 sub-pixels 22, denoted 22a to 22d, each of a distinct color.
  • the sub-pixels 22 are here triangular in shape.
  • each pixel 20 is composed of 4 sub-pixels 22, denoted 22a to 22d, each of a distinct color.
  • the sub-pixels 22 are here rectangular in shape and are arranged in a line, that is to say arranged parallel to each other in order to form rectilinear columns of sub-pixels.
  • the device 2 comprises in this example a substrate 12 in which is arranged a set of pixels 20, each pixel comprising a plurality of sub-pixels 22.
  • a lens array here denoted LN1
  • LN1 is arranged opposite the set of pixels 20 of sort to generate the color image 6 ( figure 1 ) by focusing incident light 30 on certain sub-pixels 22.
  • the substrate 12 comprises in this example a transparent upper layer 12a arranged on a white lower layer 12b.
  • the set of pixels 20 is printed on the upper face of the lower layer 12b or on the lower face of the upper layer 12a, so as to be at the interface between the layers 12a and 12b, inside the substrate 12.
  • the set of pixels 20 is printed on the upper face of the substrate 12.
  • CO2 laser radiation can be used to create the surface deformations necessary to form the LN lens array.
  • each lens LN ( figure 2 ) is positioned relative to the associated pixel 20 independently of the positioning of the other lenses LN of the lens array. This positioning is for example carried out using a camera capable of identifying, for each lens, the adapted position with respect to the associated pixel 20.
  • At least one lens LN, called the first lens, of the lens array is a converging lens configured to focus the incident light received on at least two sub-pixels 42 of the associated pixel 40 ( Figures 9-12 ) so as to cause a hybrid color CL1, CL2 resulting from a combination of the colors of said at least two sub-pixels to appear in a corresponding region R1, R2 of the color image 6, wherein said first lens LN is formed so that it has, in its smallest dimension, a smallest maximum dimension of 150 ⁇ m.
  • the generation method then comprises a determination (E6) of respective weights assigned to each of said at least two sub-pixels 42, these weights representing respective contributions of each sub-pixel 42 in the combination of colors producing the hybrid color; the first lens being positioned relative to the associated pixel 40 in accordance with said respective weights assigned to said at least two sub-pixels 42.
  • the process ( figure 17 ) may further comprise a step E5 of forming opaque zones 60 to create gray levels in the final image, as already explained with reference to the figure 15 .
  • each lens of the document of the invention is associated with a single pixel.
  • Image 6 ( figure 1 ) is thus formed by n lens/associated pixel pair(s), n being an integer greater than or equal to 1.

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  • General Health & Medical Sciences (AREA)
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Claims (12)

  1. Dokument (2), das geeignet ist, ein Farbbild (6) zu erzeugen, umfassend:
    - eine Menge von Pixeln (20), die auf oder in ein Substrat (2) gedruckt sind, wobei jedes Pixel ein Motiv bildet, das eine Anordnung von Subpixeln (22) in mindestens zwei verschiedenen Farben beinhaltet, wobei jedes Pixel (20) der Menge von Pixeln so ausgestaltet ist, dass jedes Subpixel eine unterschiedliche Farbe in dem Pixel aufweist; und
    - ein Linsenraster (LN), das gegenüber der Menge von Pixeln so angeordnet ist, dass das Farbbild durch Fokussierung oder Zerstreuung eines durch Linsen (LN) hindurch auf mindestens einen Teil der Subpixel (22) einfallenden Lichts erzeugt wird,
    wobei jede Linse (LN) relativ zu einem gegenüber liegenden zugeordneten Pixel (20) positioniert ist, um das auf mindestens eines der Subpixel (22) des zugeordneten Pixels einfallende Licht zu fokussieren oder zu zerstreuen, so dass der Beitrag der jeweiligen Farben der Subpixel des zugeordneten Pixels, in einer Region des durch die Linse hindurch erzeugten Farbbilds (6), in Bezug auf das von dem zugeordneten Pixel (20) unabhängig von der Linse (LN) intrinsisch gebildete Motiv verändert wird,
    wobei mindestens eine Linse (LN1, LN2) in dem Linsenraster eine Sammellinse ist, die dazu ausgestaltet ist, das empfangene einfallende Licht so zu fokussieren, dass der Farbbeitrag mindestens eines Subpixels (22) des zugeordneten Pixels (20), in der entsprechenden Region des durch die Linse (LN1, LN2) hindurch erzeugten Farbbilds, in Bezug auf den jeweiligen Farbbeitrag jedes anderen Subpixels (22) des zugeordneten Pixels (20) verstärkt wird, und wobei mindestens eine erste Linse (LN2) des Linsenrasters (LN) eine Sammellinse ist, die dazu ausgestaltet ist, das auf mindestens zwei Subpixeln (22) des zugeordneten Pixels empfangene einfallende Licht so zu fokussieren, dass in einer entsprechenden Region des Farbbilds eine hybride Farbe erscheint, die aus einer Kombination der Farben der mindestens zwei Subpixel (CL1, CL2) resultiert,
    dadurch gekennzeichnet, dass die erste Sammellinse (LN2) relativ zu dem zugeordneten Pixel gemäß jeweiligen Gewichtungen ausgestaltet ist, die jedem der mindestens zwei Subpixel zugeordnet sind, wobei die Gewichtungen jeweilige Beiträge jedes Subpixels in der Kombination der Farben darstellen, welche die hybride Farbe ergeben; und dadurch, dass die erste Linse in ihrer kleinsten Abmessung eine maximale kleinste Abmessung von 150 µm aufweist.
  2. Dokument nach Anspruch 1, wobei jedes Pixel (20) der Menge von Pixeln ein identisches Motiv aus farbigen Subpixeln (22) bildet.
  3. Dokument nach Anspruch 1 oder 2, wobei die Menge von Pixeln (20) so ausgestaltet ist, dass die Subpixel auf oder in dem Substrat gleichmäßig verteilt sind.
  4. Dokument nach einem der Ansprüche 1 bis 3, wobei die Wahrscheinlichkeitsdichte des Vorhandenseins jeder Subpixelfarbe in der Menge von Pixeln konstant ist.
  5. Dokument nach einem der Ansprüche 1 bis 4, wobei das Linsenraster (LN) ausgehend von einer Schicht gebildet wird, die Verformungen an der Oberfläche beinhaltet, die Mikrolinsen definieren, wobei die Schicht das Substrat oder eine mit dem Substrat laminierte Schicht ist.
  6. Dokument nach einem der Ansprüche 1 bis 5, wobei die Subpixel (22) in der Menge von Pixeln eine reflektierende Oberfläche (23) beinhalten, die unter den Subpixeln positioniert ist, um das durch das Linsenraster hindurch einfallende Licht zu reflektieren.
  7. Dokument nach einem der Ansprüche 1 bis 6, wobei mindestens eine Linse des Linsenrasters eine Zerstreuungslinse ist, die dazu ausgestaltet ist, ein von der Linse empfangenes einfallendes Licht so zu zerstreuen, dass der Farbbeitrag mindestens eines Subpixels des zugeordneten Pixels, in der entsprechenden Region des durch die Linse hindurch erzeugten Farbbilds, in Bezug auf den jeweiligen Farbbeitrag jedes anderen Subpixels des zugeordneten Pixels verringert wird.
  8. Dokument nach einem der Ansprüche 1 bis 7, umfassend ferner:
    eine laserbare transparente Schicht (65), die gegenüber der Menge von Pixeln (20) angeordnet ist, wobei die laserbare transparente Schicht mindestens teilweise durch eine Laserstrahlung karbonisiert ist, so dass sie gegenüber Subpixeln lokal undurchsichtig gemachte Regionen umfasst, um Graustufen in dem durch Linsen hindurch erzeugten Farbbild zu ergeben.
  9. Verfahren zur Erzeugung eines Farbbilds (6), umfassend:
    - Drucken (E2) einer Menge von Pixeln (20) auf oder in ein Substrat, wobei jedes Pixel ein Motiv bildet, das eine Anordnung von Subpixeln (22) in mindestens zwei verschiedenen Farben beinhaltet, wobei jedes Pixel (20) der Menge von Pixeln so ausgestaltet ist, dass jedes Subpixel (22) eine unterschiedliche Farbe in dem Pixel aufweist; und
    - Bilden (E4) eines Linsenrasters (LN), das gegenüber der Menge von Pixeln so angeordnet ist, dass das Farbbild durch Fokussierung oder Zerstreuung eines durch Linsen hindurch auf mindestens einen Teil der Subpixel einfallendes Lichts erzeugt wird,
    wobei jede Linse relativ zu einem gegenüberliegenden zugeordneten Pixel positioniert ist, um das auf mindestens eines der Subpixel des zugeordneten Pixels einfallende Licht zu fokussieren oder zu zerstreuen, so dass der Beitrag der jeweiligen Farben der Subpixel des zugeordneten Pixels, in einer Region des durch die Linse hindurch erzeugten Farbbilds, in Bezug auf das von dem zugeordneten Pixel unabhängig von der Linse intrinsisch gebildete Motiv verändert wird,
    wobei mindestens eine erste Linse (LN2) des Linsenrasters eine Sammellinse ist, die dazu ausgestaltet ist, das auf mindestens zwei Subpixeln (22) des zugeordneten Pixels empfangene einfallende Licht so zu fokussieren, dass in einer entsprechenden Region des Farbbilds eine hybride Farbe erscheint, die aus einer Kombination der Farben der mindestens zwei Subpixel (CL1, CL2) resultiert,
    dadurch gekennzeichnet, dass die Sammellinse relativ zu dem zugeordneten Pixel gemäß jeweiligen Gewichtungen ausgestaltet ist, die jedem der mindestens zwei Subpixel zugeordnet sind, wobei die Gewichtungen jeweilige Beiträge jedes Subpixels in der Kombination der Farben darstellen, welche die hybride Farbe ergeben, wobei die erste Linse relativ zu dem zugeordneten Pixel gemäß den jeweiligen Gewichtungen ausgestaltet ist, die den mindestens zwei Subpixeln zugeordnet sind; und
    dadurch, dass die erste Linse in ihrer kleinsten Abmessung eine maximale kleinste Abmessung von 150 µm aufweist.
  10. Verfahren nach Anspruch 9, umfassend:
    - Bereitstellen einer ersten transparenten Schicht; und
    - Projizieren auf die erste transparente Schicht einer ersten Laserstrahlung, so dass durch Verformung an der Oberfläche der ersten transparenten Schicht Linsen gebildet werden.
  11. Verfahren nach Anspruch 9, umfassend:
    - Bereitstellen einer ersten transparenten Schicht; und
    - Ausführen auf der ersten transparenten Schicht einer Projektion von transparentem Material unter Verwendung eines 3D-Druckkopfes, so dass an der Oberfläche der ersten transparenten Schicht Linsen gebildet werden.
  12. Verfahren nach einem der Ansprüche 9 bis 11, wobei, bei dem Schritt des Bildens, jede Linse relativ zu dem gegenüberliegenden zugeordneten Pixel unabhängig von der Positionierung der anderen Linsen des Linsenrasters positioniert ist.
EP19717539.1A 2018-03-16 2019-03-14 Dokument und verfahren zur erzeugung eines farbbildes Active EP3765307B1 (de)

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FR3140012B1 (fr) 2022-09-28 2024-12-20 Idemia France Document de sécurité comprenant une couche opaque d’apparence blanche perforée au-dessus d’une matrice de sous-pixels colorés
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US20210016593A1 (en) 2021-01-21
FR3079052A1 (fr) 2019-09-20
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US11007811B2 (en) 2021-05-18
EP3765307A1 (de) 2021-01-20
AU2019235502B2 (en) 2024-08-15
AU2019235502A1 (en) 2020-10-15
KR102733785B1 (ko) 2024-11-26
JP2021518282A (ja) 2021-08-02

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