WO2008139046A1 - Electronically renewable image pixels - Google Patents

Electronically renewable image pixels Download PDF

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Publication number
WO2008139046A1
WO2008139046A1 PCT/FR2008/000184 FR2008000184W WO2008139046A1 WO 2008139046 A1 WO2008139046 A1 WO 2008139046A1 FR 2008000184 W FR2008000184 W FR 2008000184W WO 2008139046 A1 WO2008139046 A1 WO 2008139046A1
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WO
WIPO (PCT)
Prior art keywords
sub
pixels
droplets
pixel
gel
Prior art date
Application number
PCT/FR2008/000184
Other languages
French (fr)
Inventor
Jean-Pierre Lazzari
Jean-Marc Lazzari
Original Assignee
Jean-Pierre Lazzari
Jean-Marc Lazzari
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Publication date
Application filed by Jean-Pierre Lazzari, Jean-Marc Lazzari filed Critical Jean-Pierre Lazzari
Publication of WO2008139046A1 publication Critical patent/WO2008139046A1/en

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/302—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements characterised by the form or geometrical disposition of the individual elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L1/00—Repeatedly-usable boards or tablets for writing or drawing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/08—Signs, boards or panels, illuminated from behind the insignia using both translucent and non-translucent layers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F7/00—Signs, name or number plates, letters, numerals, or symbols; Panels or boards
    • G09F7/02—Signs, plates, panels or boards using readily-detachable elements bearing or forming symbols
    • G09F7/12—Signs, plates, panels or boards using readily-detachable elements bearing or forming symbols the elements being secured or adapted to be secured by self-adhesion, moisture, suction, slow-drying adhesive or the like
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/37—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being movable elements

Definitions

  • the present invention aims at new electronically renewable image pixels. It finds applications including advertising screens, preferably large, installed for example in public places.
  • the invention more particularly relates to pixels comprising 256 gray levels, which make up electronically renewable images.
  • the pixels are composed of three sub pixels in the three basic colors.
  • the sub-pixels may be, according to the French patent application No. 06/08723, more or less covered with droplets of gels.
  • the number of these gel droplets is between zero, and 256, when the surface of the sub-pixel is completely covered.
  • the 256 droplets are deposited in the form of a matrix of 16 x 16 droplets, the sub-pixel then having a square shape.
  • the object of the present invention is to overcome these disadvantages by proposing new pixels consisting of sub pixels, in the three fundamental colors, having the same number of gray levels, that is to say 256 levels per sub-pixel, made with a minimum of gel droplets, allowing the use of inkjet heads of low performance, in terms of droplet flow, and in terms of resolution.
  • the subject of the invention is pixels, composed of three sub-pixels, each having a fundamental color. Subpixel colors are achieved by inkjet deposition techniques, or printing techniques used in printing. The surface of the sub-pixels is more or less covered with droplets of a recyclable gel, opaque, monochrome, which does not dry, said gel having a black color.
  • the gel is deposited by inkjet techniques.
  • the 256 gray levels are obtained according to the invention, by j uxtaposition of gel droplets, the surface of which covers either half of the surface of the sub-pixel, or the quarter, the eighth, the sixteenth, etc. .. up to 1/256 th of the surface of the sub-pixel. More precisely, if the surface of the subpixel is kx256, the droplets used to cover its surface will have a surface equal to kxl28, kx64, kx32, kx16, kx8, kx4, kx2, kx1.
  • kxO uncoated surface
  • kx256 totally covered surface
  • the droplets of different surfaces are obtained from ejection nozzles known to those skilled in the art, having a suitable diameter, adapted at the desired surface, or from nozzles having a given diameter, but with a variable gel expulsion energy.
  • This "type nozzles particular uses the piezoelectric effect to eject the gel droplets.
  • An optimized pixel shape according to the invention makes it possible to reduce the number of droplet diameter types, by depositing the same droplet several times. For example, according to the previous example, instead of depositing a droplet forming a surface of kxl28, it is possible to deposit two surface droplets of kx64, or four surface droplets kx32. It is then appropriate that the shape of the sub-pixel is adapted, so that its surface can be completely covered by 4 droplets forming the surface of kx64, or eight droplets forming a surface of kx32. In any case, the features and advantages of the invention will appear better after the description which follows, given for explanatory purposes and in no way limiting. This description refers to the accompanying drawings, in which:
  • FIG. 1 shows a pixel composed of these three sub-pixels, according to the prior art.
  • FIG. 2 shows a sub-pixel whose rectangular shape has been optimized to receive four kx64 surface droplets.
  • Figure 3 shows the same sub-pixel covered with 6 kx64 surface droplets -
  • Figure 4 shows the same sub-pixel whose perimeter includes a black frame
  • FIG. 5 shows the same sub-pixel coated by way of example of droplets with a total surface area of ⁇ xl94.
  • Figure 1 shows the image of a pixel according to the prior art.
  • the pixel is composed of three sub pixels (100), (101), (102).
  • the three sub-pixels have a square shape of identical surface.
  • Each sub-pixel is covered by a fundamental color, so that all three sub-pixels, ie the pixel, appear white.
  • the sub-pixels have a size such that at the distance where they are seen by the observer, the eye of the latter does not see them separately, but sees a white spot, composed of three sub pixels in three fundamental colors.
  • the sub-pixels are square.
  • the gray levels of the image constituted by the set of pixels is a function of the surface of the droplets deposited on the surface of the sub-pixels.
  • the sub-pixel can receive a maximum of 256 black gel droplets. If it receives 256 black droplets, all its surface will be covered, and it will appear black to the observer.
  • the sub-pixel according to the prior art requires surface droplet sizes equal to 1/16 of the sub-pixel side.
  • the size of the sub-pixel is of the order of 180 ⁇ m x 180 ⁇ m, that is to say that the gel droplet must have a diameter of the order of 11.2 ⁇ m, or according to the man of art, 2260 dpi (dot per inch) in English language.
  • This is an important resolution, which significantly increases the price of inkjet heads.
  • the flow of these heads must be important, so that the scanning speed, to cover the entire surface of the screen, is not too slow, a large number of droplets to be deposited.
  • the invention provides for the use of gel droplets of given diameter, the juxtaposition of which, starting from at most 8 defined diameters, makes it possible to perform all of the 256 gray levels, as previously described. .
  • FIG. 2 shows the sub-pixel (100) according to the invention, beside which is the sub-pixel (101), not shown in the figure.
  • the surface of the sub-pixel (100). is identical to that of the same sub-pixel of Figure 1, which in the given example had a surface of 32400 ⁇ m 2 .
  • the shape of as' pixel of Figure 2 is rectangular.
  • the length of the sub-pixel (100) is equal to 4 times its width, because it can contain 4 droplets of 90 ⁇ m tangent to each other, as shown in Figure 2.
  • the length of the sub-pixel (100) is 360 ⁇ m, and its width 90 ⁇ m, equal to the diameter of the droplet kx 64.
  • FIG. 1 shows the sub-pixel (100) according to the invention, beside which is the sub-pixel (101), not shown in the figure.
  • the surface of the sub-pixel (100). is identical to that of the same sub-pixel of Figure 1, which in the given example had a surface of 32400 ⁇ m 2 .
  • FIG. 2 shows the juxtaposition of the four gel droplets (200) of 90 ⁇ m diameter.
  • these 4 droplets (200) we can cover the surfaces kx256, kxl92, kxl28, kx64 with one ink jet head t ery low resolution (282 dpi), producing kx64 surface droplets. Nevertheless, it can be seen that the entire surface of the sub-pixel (100) is not covered because of the circular shape of the droplets (200). The surfaces (201) are not covered.
  • FIG. 3 ' shows that without changing the ink jet head, the uncovered surfaces (201) can be minimized by depositing 6 droplets (200) instead of 4 droplets.
  • the uncovered cumulative surfaces (201) represent about 10% of the area of the uncoated subpixel.
  • Figure 4 shows a black frame (400) around each sub-pixel (100) to hide the surfaces (201).
  • Fig. 5 shows an example of a sub-pixel (100) having the black frame (400) covered with 6 droplets (20,0). The entire surface is covered, showing a black background of excellent quality.
  • FIG. 6 shows a sub-pixel according to the preceding example, of a surface covered with kxl94, composed of 3 gel droplets (200) with a 90 ⁇ m diameter, covering half of the surface of the sub-pixel, ie kxl28, plus a droplet additional 90 ⁇ m, covering a surface of kx64, and finally a droplet (600) covering a surface of kx2, in total, a covered area of kxl94.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Ink Jet (AREA)

Abstract

The invention relates to electronically renewable image pixels formed by three sub-pixels (100) in the three primary colours, in which the surface area of said sub-pixels (100) kx256 is completely or partially covered in order to obtain 256 grey levels per sub-pixel (100), using droplets (200, 600) of a recyclable, dark, opaque gel, which are deposited using ink jet techniques, juxtaposing droplets of gel having a surface area kx128, kx64, kx32, kx1β, kx8, kx4, kx2, kx1. The invention is suitable for large image displays.

Description

PIXELS D' IMAGES RENOUVELABLES ELECTRONIQUEMENT P IXELS OF ELECTRONICALLY RENEWABLE IMAGES
DESCRIPTIF Domaine d'application de l'invention:DESCRIPTION OF THE FIELD OF THE INVENTION
La présente invention a pour but de nouveaux pixels d'images renouvelables électroniquement. Elle trouve des applications notamment dans les écrans publicitaires, de préférence de grande taille, installés par exemple dans les lieux publics. L'invention concerne plus particulièrement les pixels comprenant 256 niveaux de gris, qui composent les images renouvelables électroniquement.The present invention aims at new electronically renewable image pixels. It finds applications including advertising screens, preferably large, installed for example in public places. The invention more particularly relates to pixels comprising 256 gray levels, which make up electronically renewable images.
Etat de l'art antérieur:State of the prior art:
II existe de nombreux afficheurs publicitaires, qui déroulent des images imprimées sur un support souple. Ces afficheurs offrent une qualité d'image très supérieure aux affiches papier, collées sur un support vertical. En effet, la transparence du substrat polyester, permet soit de rétro éclairer les images ce qui produit un rendu visuel de haute qualité, soit de les éclairer frontalement . De plus, plusieurs images sont présentées en alternance. Malgré les qualités indéniables de ces afficheurs, ils présentent néanmoins de nombreux inconvénients. Lorsque l'on veut changer une image, il faut qu'un technicien de maintenance se déplace, et change les rouleaux de l'afficheur. En amont de cette opération, une logistique importante est nécessaire : impression des images, stockage et distribution des rouleaux, recyclage des rouleaux anciens, qui augmentent considérablement le . coût de fonctionnement de ces afficheurs. Comme cette logistique est lourde et complexe, ce type d'afficheur ne permet pas d'afficher des images relatives à un événement qui vient de se produire. Cet affichage événementiel, est impossible avec ces dispositifs. C'est ainsi que des solutions ont été proposées, afin d'éviter ces problèmes. Il a été proposé d'imprimer une image, directement sur le substrat déroulant, à l'intérieur même de l'afficheur, en utilisant les techniques de jet d'encre. Afin de pouvoir renouveler les images, l'encre ne sèche pas, sur son support, puis après exposition de l'image, le support est nettoyé de son encre, qui est éliminée. Ces solutions sont décrites notamment dans les brevets Japonais JP6046225, JP2003337548. Si les dispositifs décrits par ces brevets présentent certains avantages par rapport aux dispositifs déroulants classiques, à image permanente, ils consomment énormément d'encre. La récupération de l'encre, mélange les couleurs, ce qui fait que l'encre récupérée, ne peut pas être réutilisée. L'encre récupérée est donc stockée dans un réservoir poubelle. Mais la quantité d'encre, fonction du nombre d'images, et de la taille de ces images, peut atteindre plusieurs litres par jour. Il n'est pas possible de stocker des quantités d'encre aussi importantes. Ce problème est si difficile, que le brevet JP2002251150 décrit même un dispositif de décomposition de l'encre par des rayons ultraviolets, afin d'éliminer l'encre au fur et à mesure du nettoyage du substrat. Afin d'éviter ces inconvénients, il a été proposé de déposer par les techniques de jet d'encre, une gel opaque, monochrome, sur une surface recouverte de sous pixels aux trois couleurs fondamentales. Les sous pixels sont plus ou moins recouverts par le gel monochrome et opaque, formant ainsi les niveaux de gris de l'image. Le gel est récupérable et recyclable. L'image obtenue est de grande qualité. La demande de brevet français N° 06/08723 du 5 octobre 2006 décrit un tel dispositif. Ce dispositif offre de nombreux avantages par rapports aux précédents, par le fait que le gel opaque monochrome est récupéré et recyclé, ce qui permet de réduire les coûts de maintenance de ces dispositifs. Les pixels, sont composés de trois sous pixels aux trois couleurs fondamentales. Afin d'offrir une grande palette de couleurs, les sous pixels peuvent être, selon la demande de brevet français N° 06/08723, plus ou moins recouverts de gouttelettes de gels. Le nombre de ces gouttelettes de gel est compris entre zéro, et 256, lorsque la surface du sous pixel est totalement recouverte. Les 256 gouttelettes, sont déposées sous forme d'une matrice de 16 x 16 gouttelettes, le sous pixel ayant alors une forme carrée. Bien qu' intéressants à certains égards, les sous pixels décrits dans la demande de brevet français N° 06/08723, nécessitent des têtes d'impression à haut débit, et à haute définition. La présente invention, a pour but de remédier à ces inconvénients, en proposant de nouveaux pixels constitués de sous pixels, aux trois couleurs fondamentales, présentant le même nombre de niveaux de gris, c'est-à-dire 256 niveaux par sous pixel, réalisés avec un minimum de gouttelettes de gel, permettant l'utilisation de têtes à jet d'encre de faible performance, en terme de débit de gouttelettes, et en terme de résolution. De façon plus précise, l'invention a pour objet des pixels, composés de trois sous pixels, chacun ayant une couleur fondamentale. Les couleurs des sous pixels, sont réalisées par les techniques de dépôt par jet d'encre, ou les techniques d'impressions utilisées en imprimerie. La surface des sous pixels est plus ou moins recouverte de gouttelettes d'un gel recyclable, opaque, monochrome, qui ne sèche pas, le dit gel ayant une couleur noire. Le gel est déposé par les techniques de jet d'encre. Les 256 niveaux de gris, sont obtenus selon l'invention, par la juxtaposition de gouttelettes de gel, dont la surface, couvre, soit la moitié de la surface du sous pixel, soit le quart, soit le huitième, le seizième, etc.. jusqu'au 1/256 ième de la surface du sous pixel. Plus précisément, si la surface du sous pixel est kx256, les gouttelettes utilisées pour couvrir sa surface, auront une- surface égale à kxl28, kx64, kx32, kxl6, kx8, kx4, kx2, kxl . Selon l'invention, par la juxtaposition de certaines des huit surfaces définies précédemment, il est possible d'obtenir toutes les surfaces comprises entre une surface non recouverte, (kxO) et une surface totalement recouverte (kx256). A titre d'exemple, supposons que l'on veuille recouvrir de gel, une surface égale à kxl94. Pour ce faire, on déposera une gouttelette de surface kxl28, plus une gouttelette de surface kx64, plus une gouttelette de surface kx2, soit au total : kxl28 + kx64 +kx2 = kxl94. Seulement 3 gouttelettes de taille kxl28, kx64 et kx2 , auront été utilisées pour obtenir la surface recherchée, au lieu de 194 gouttelettes de petite taille, ayant une surface identique, selon l'art antérieur.There are many advertising displays, which unroll images printed on a flexible medium. These displays offer an image quality far superior to paper posters, glued on a vertical support. Indeed, the transparency of the polyester substrate, allows to either backlight the images which produces a high-quality visual rendering, or to illuminate them frontally. In addition, several images are presented alternately. Despite the undeniable qualities of these displays, they nevertheless have many disadvantages. When you want to change an image, it is necessary for a maintenance technician to move, and change the rollers of the display. Upstream of this operation, an important logistics is necessary: printing of images, storage and distribution of rolls, recycling of old rolls, which considerably increase the. operating cost of these displays. As this logistics is heavy and complex, this type of display does not display images relating to an event that has just occurred. This event display is impossible with these devices. Thus, solutions have been proposed to avoid these problems. It has been proposed to print an image, directly on the scrolling substrate, inside the display itself, using inkjet techniques. In order to renew the images, the ink does not dry, on its support, and after exposure of the image, the support is cleaned of its ink, which is eliminated. These solutions are described in particular in Japanese Patent JP6046225, JP2003337548. If the devices described by these patents have certain advantages over conventional drop-in devices, permanent image, they consume a lot of ink. The recovery of the ink, mixes the colors, so that the ink recovered, can not be reused. The recovered ink is therefore stored in a trash tank. But the amount of ink, depending on the number of images, and the size of these images, can reach several liters per day. It is not possible to store such large amounts of ink. This problem is so difficult that patent JP2002251150 even describes a device for decomposing the ink with ultraviolet rays in order to eliminate the ink as the substrate is cleaned. In order to avoid these drawbacks, it has been proposed to deposit, by inkjet techniques, an opaque, monochrome gel on a surface covered with sub pixels in the three basic colors. The sub-pixels are more or less covered by the gel monochrome and opaque, thus forming the gray levels of the image. The gel is recoverable and recyclable. The image obtained is of high quality. French patent application No. 06/08723 of October 5, 2006 describes such a device. This device offers many advantages over the previous ones, in that the monochrome opaque gel is recovered and recycled, which reduces the maintenance costs of these devices. The pixels are composed of three sub pixels in the three basic colors. In order to offer a wide range of colors, the sub-pixels may be, according to the French patent application No. 06/08723, more or less covered with droplets of gels. The number of these gel droplets is between zero, and 256, when the surface of the sub-pixel is completely covered. The 256 droplets are deposited in the form of a matrix of 16 x 16 droplets, the sub-pixel then having a square shape. Although interesting in some respects, the sub-pixels described in the French patent application No. 06/08723, require high-speed print heads, and high definition. The object of the present invention is to overcome these disadvantages by proposing new pixels consisting of sub pixels, in the three fundamental colors, having the same number of gray levels, that is to say 256 levels per sub-pixel, made with a minimum of gel droplets, allowing the use of inkjet heads of low performance, in terms of droplet flow, and in terms of resolution. More specifically, the subject of the invention is pixels, composed of three sub-pixels, each having a fundamental color. Subpixel colors are achieved by inkjet deposition techniques, or printing techniques used in printing. The surface of the sub-pixels is more or less covered with droplets of a recyclable gel, opaque, monochrome, which does not dry, said gel having a black color. The gel is deposited by inkjet techniques. The 256 gray levels are obtained according to the invention, by j uxtaposition of gel droplets, the surface of which covers either half of the surface of the sub-pixel, or the quarter, the eighth, the sixteenth, etc. .. up to 1/256 th of the surface of the sub-pixel. More precisely, if the surface of the subpixel is kx256, the droplets used to cover its surface will have a surface equal to kxl28, kx64, kx32, kx16, kx8, kx4, kx2, kx1. According to the invention, by juxtaposing some of the eight surfaces defined above, it is possible to obtain all the surfaces between an uncoated surface (kxO) and a totally covered surface (kx256). For example, suppose we want to cover with gel, an area equal to kxl94. To do this, a surface droplet kxl28, plus a surface droplet kx64, plus a surface droplet kx2, or a total: kxl28 + kx64 + kx2 = kxl94, will be deposited. Only 3 droplets of size kxl28, kx64 and kx2, will have been used to obtain the desired surface, instead of 194 small droplets, having an identical surface, according to the prior art.
Les gouttelettes de différentes surfaces, sont obtenues à partir de buses d'éjection connues de l'homme de l'art, ayant un diamètre adéquat, adapté à la surface recherchée, ou à partir de buses ayant un diamètre donné, mais avec une énergie d'expulsion du gel variable. Ce "type de buses utilise notamment l'effet piézoélectrique pour éjecter les gouttelettes de gel.The droplets of different surfaces, are obtained from ejection nozzles known to those skilled in the art, having a suitable diameter, adapted at the desired surface, or from nozzles having a given diameter, but with a variable gel expulsion energy. This "type nozzles particular uses the piezoelectric effect to eject the gel droplets.
Une forme de pixel optimisée selon l'invention, permet de réduire le nombre de type de diamètre de gouttelettes, en déposant plusieurs fois la même gouttelette. Par exemple, selon l'exemple précédent, au lieu de déposer une gouttelette formant une surface de kxl28, il est possible de déposer deux gouttelettes de surface de kx64, ou quatre gouttelettes de surface kx32. Il convient alors, que la forme du sous pixel soit adaptée, afin que sa surface puisse être totalement recouverte par 4 gouttelettes formant la surface de kx64, ou huit gouttelettes formant une surface de kx32. De toute façon, les caractéristiques et avantages de l' invention, apparaîtront mieux après la description qui suit, donnée à titre explicatif et nullement limitatif. Cette description se réfère aux dessins annexés, sur lesquels :An optimized pixel shape according to the invention makes it possible to reduce the number of droplet diameter types, by depositing the same droplet several times. For example, according to the previous example, instead of depositing a droplet forming a surface of kxl28, it is possible to deposit two surface droplets of kx64, or four surface droplets kx32. It is then appropriate that the shape of the sub-pixel is adapted, so that its surface can be completely covered by 4 droplets forming the surface of kx64, or eight droplets forming a surface of kx32. In any case, the features and advantages of the invention will appear better after the description which follows, given for explanatory purposes and in no way limiting. This description refers to the accompanying drawings, in which:
--La figure 1 montre un pixel composé de ces trois sous pixels, selon l'art antérieur. --La figure 2 montre un sous pixel dont la forme rectangulaire à été optimisée pour recevoir quatre gouttelettes de surface kx64. --La figure 3 montre le même sous pixel recouvert de 6 gouttelettes de surface kx64 --La figure 4 montre le même sous pixel dont le périmètre comporte un cadre noirFIG. 1 shows a pixel composed of these three sub-pixels, according to the prior art. FIG. 2 shows a sub-pixel whose rectangular shape has been optimized to receive four kx64 surface droplets. --Figure 3 shows the same sub-pixel covered with 6 kx64 surface droplets - Figure 4 shows the same sub-pixel whose perimeter includes a black frame
--La figure 5 montre le même sous pixel recouvert à titre d'exemple, de gouttelettes de surface totale kxl94. La figure 1 montre l'image d'un pixel selon l'art antérieur. Le pixel est composé de trois sous pixels (100), (101), (102). Les trois sous pixels ont une forme carrée de surface identique. Chaque sous pixel est recouvert par une couleur fondamentale, ce qui fait que l'ensemble de ces trois sous pixels, c'est- à-dire le pixel, apparaît blanc. Les sous pixels, ont une taille telle qu'à la distance où ils sont vus par l'observateur, l'œil de ce dernier ne les voit pas séparément, mais voit une tache blanche, composée des trois sous pixels aux trois couleurs fondamentales. Selon l'art antérieur, les sous pixels sont carrés. Ils peuvent être totalement recouverts ou partiellement recouverts par des gouttelettes de gel opaque, qui ne sèche pas, recyclable, de couleur noire, selon l'invention, ces gouttelettes étant projetées sur la surface des sous pixels par les techniques dites de jet d'encre, connues de l'homme de l'art. Les niveaux de gris de l'image constituée par l'ensemble des pixels, est fonction de la surface des gouttelettes déposées sur la surface des sous pixels. Selon l'art antérieur, pour obtenir 256 niveaux de gris par couleur, le sous pixel pourra recevoir au maximum 256 gouttelettes de gel noir. S'il reçoit 256 gouttelettes noires, toute sa surface sera recouverte, et il apparaîtra noir à l'observateur. Une matrice (103) de 16 x 16 = 256 gouttelettes permet d'obtenir les 256 niveaux de gris, en fonction du nombre de gouttelettes déposées.FIG. 5 shows the same sub-pixel coated by way of example of droplets with a total surface area of λxl94. Figure 1 shows the image of a pixel according to the prior art. The pixel is composed of three sub pixels (100), (101), (102). The three sub-pixels have a square shape of identical surface. Each sub-pixel is covered by a fundamental color, so that all three sub-pixels, ie the pixel, appear white. The sub-pixels have a size such that at the distance where they are seen by the observer, the eye of the latter does not see them separately, but sees a white spot, composed of three sub pixels in three fundamental colors. According to the prior art, the sub-pixels are square. They can be completely covered or partially covered by droplets of opaque gel, which does not dry, recyclable, black in color, according to the invention, these droplets being projected onto the surface of subpixels by so-called inkjet techniques. known to those skilled in the art. The gray levels of the image constituted by the set of pixels, is a function of the surface of the droplets deposited on the surface of the sub-pixels. According to the prior art, to obtain 256 gray levels per color, the sub-pixel can receive a maximum of 256 black gel droplets. If it receives 256 black droplets, all its surface will be covered, and it will appear black to the observer. A matrix (103) of 16 x 16 = 256 droplets makes it possible to obtain the 256 gray levels, as a function of the number of droplets deposited.
Le sous pixel selon l'art antérieur nécessite des tailles de gouttelettes de surface égale au 1/16 du coté du sous pixel. Pour des dimensions d'écran inférieures à 2 mètres, la taille du sous pixel est de l'ordre de 180μm x 180μra, c'est-à-dire que la gouttelette de gel doit avoir un diamètre de l'ordre de ll,2μm, ou selon l'homme de l'art, 2260 dpi (dot per inch) en langage anglo-saxon. Il s'agit d'une résolution importante, ce qui augmente notablement le prix des têtes de jet d'encre. Le débit de ces têtes doit de plus être important, afin que la vitesse de balayage, pour couvrir toute la surface de l'écran, ne soit pas trop lente, un grand nombre de gouttelettes devant être déposées.The sub-pixel according to the prior art requires surface droplet sizes equal to 1/16 of the sub-pixel side. For screen dimensions less than 2 meters, the size of the sub-pixel is of the order of 180 μm x 180 μm, that is to say that the gel droplet must have a diameter of the order of 11.2 μm, or according to the man of art, 2260 dpi (dot per inch) in English language. This is an important resolution, which significantly increases the price of inkjet heads. The flow of these heads must be important, so that the scanning speed, to cover the entire surface of the screen, is not too slow, a large number of droplets to be deposited.
Afin d'éviter ces problèmes, l'invention prévoit l'utilisation de gouttelettes de gel, de diamètre donné dont la juxtaposition permet à partir au maximum de 8 diamètres définis, de pouvoir réaliser l'ensemble des 256 niveaux de gris, comme décrit précédemment .In order to avoid these problems, the invention provides for the use of gel droplets of given diameter, the juxtaposition of which, starting from at most 8 defined diameters, makes it possible to perform all of the 256 gray levels, as previously described. .
La figure 2 montre le sous pixel (100) selon l'invention, à coté duquel se trouve le sous pixel (101), non représenté sur la figure. La surface du sous pixel (100). est identique à celle du même sous pixel de la figure 1-, qui dans l'exemple donné avait une surface de 32400μm2. Au lieu d'être carrée, la forme du sous ' pixel de la figure 2, est rectangulaire. La longueur du sous pixel (100), est égale à 4 fois sa largeur, car il peut contenir 4 gouttelettes de 90 μm tangentes les une aux autres, comme le montre la figure 2. Dans l'exemple donné, la longueur du sous pixel (100) est de 360μm, et sa largeur de 90μm, égale au diamètre de la gouttelette k x 64 . Dans la surface de ce sous pixel, la figure 2 montre la juxtaposition des 4 gouttelettes de gel (200) de 90μm dé diamètre. Avec ces 4 gouttelettes (200), on peut couvrir les surfaces kx256 , kxl92, kxl28, kx64, avec une seule tête à jet d'encre de très faible résolution (282 dpi), produisant des gouttelettes de surface kx64. Néanmoins, on s'aperçoit que toute la surface du sous pixel (100) n'est pas recouverte, à cause de la forme circulaire des gouttelettes (200) . Les surfaces (201) ne sont pas recouvertes.FIG. 2 shows the sub-pixel (100) according to the invention, beside which is the sub-pixel (101), not shown in the figure. The surface of the sub-pixel (100). is identical to that of the same sub-pixel of Figure 1, which in the given example had a surface of 32400μm 2 . Instead of being square, the shape of as' pixel of Figure 2, is rectangular. The length of the sub-pixel (100) is equal to 4 times its width, because it can contain 4 droplets of 90 μm tangent to each other, as shown in Figure 2. In the example given, the length of the sub-pixel (100) is 360μm, and its width 90μm, equal to the diameter of the droplet kx 64. In the surface of this sub-pixel, FIG. 2 shows the juxtaposition of the four gel droplets (200) of 90 μm diameter. With these 4 droplets (200), we can cover the surfaces kx256, kxl92, kxl28, kx64 with one ink jet head t ery low resolution (282 dpi), producing kx64 surface droplets. Nevertheless, it can be seen that the entire surface of the sub-pixel (100) is not covered because of the circular shape of the droplets (200). The surfaces (201) are not covered.
La figure 3', montre, que sans changer de tête à jet d'encre, on peut minimiser les surfaces (201) non recouvertes, en déposant 6 gouttelettes (200) au lieu de 4 gouttelettes. Les surfaces cumulées non recouvertes (201) représentent environ 10% de la surface du sous pixel non recouverte.FIG. 3 ' shows that without changing the ink jet head, the uncovered surfaces (201) can be minimized by depositing 6 droplets (200) instead of 4 droplets. The uncovered cumulative surfaces (201) represent about 10% of the area of the uncoated subpixel.
La figure 4 montre un cadre noir (400) autour de chaque sous pixel (100) afin de cacher les surfaces (201).Figure 4 shows a black frame (400) around each sub-pixel (100) to hide the surfaces (201).
La figure 5 montre un exemple de sous pixel (100) ayant le cadre noir (400) recouvert de 6 gouttelettes (20,0) . La totalité de la surface est couverte, montrant un fond noir d'excellente qualité.Fig. 5 shows an example of a sub-pixel (100) having the black frame (400) covered with 6 droplets (20,0). The entire surface is covered, showing a black background of excellent quality.
La figure 6 montre un sous pixel selon l'exemple précédent, d'une surface recouverte de kxl94, composée de 3 gouttelettes de gel (200) de diamètre 90μm, couvrant la moitié de la surface du sous pixel, soit kxl28, plus une gouttelette supplémentaire de 90μm, couvrant urie surface de kx64, et enfin une gouttelette (600) couvrant une surface de kx2, soit au total, une surface couverte de kxl94. FIG. 6 shows a sub-pixel according to the preceding example, of a surface covered with kxl94, composed of 3 gel droplets (200) with a 90μm diameter, covering half of the surface of the sub-pixel, ie kxl28, plus a droplet additional 90μm, covering a surface of kx64, and finally a droplet (600) covering a surface of kx2, in total, a covered area of kxl94.

Claims

REVENDICATIONS
1. Pixels d'images renouvelables électroniquement pour écrans publicitaires de grande dimension, composés de trois sous pixels (100, 101, 102) aux trois couleurs fondamentales, la surface des sous pixels kx256~, pouvant être recouverte totalement ou partiellement par des gouttelettes d'un gel opaque recyclable, déposées par les technique de jet d'encre, caractérisés en ce que 256 niveaux de gris par sous pixel, sont obtenus par la juxtaposition de gouttelettes de gel de surface égale à kxl28, kx64, kx32, kxlβ, kx8, kx4, kx2, kxl.1. Pixels of electronically renewable images for large advertising screens, composed of three sub-pixels (100, 101, 102) in the three fundamental colors, the surface of the sub pixels kx256 ~, which can be covered totally or partially by droplets of a recyclable opaque gel deposited by the inkjet technique, characterized in that 256 gray levels per sub-pixel are obtained by the juxtaposition of surface gel droplets equal to kxl28, kx64, kx32, kxlβ, kx8 , kx4, kx2, kxl.
2. Pixels d'images renouvelables électroniquement pour écrans publicitaires de grande dimension, composés de trois sous pixels (100,101,102) selon la revendication 1, caractérisés en ce que les -sous pixels ont une forme rectangulaire, de largeur égale au diamètre de la gouttelettes de surface kx64, et de longueur égale à 4 fois sa largeur.2. Electronically renewable image pixels for large advertising screens, composed of three sub-pixels (100, 101, 102) according to claim 1, characterized in that the sub-pixels have a rectangular shape, of width equal to the diameter of the droplets of kx64 surface, and length equal to 4 times its width.
3. Pixels d'images renouvelables électroniquement pour écrans publicitaires de grande dimension, composés de trois sous pixels (100,101,102) selon la revendication 1, caractérisés en ce que 6 gouttelettes de surface kx64 soient réparties sur la surface d'un sous pixel lorsque celle-ci doit être totalement recouverte.3. Electronically renewable image pixels for large size advertising screens, composed of three sub-pixels (100, 101, 102) according to claim 1, characterized in that 6 surface droplets kx64 are distributed over the surface of a sub-pixel when this it must be completely covered.
4. Pixels d'images renouvelables électroniquement pour écrans publicitaires de grande4. Electronically renewable image pixels for large advertising screens
'dimension, composés de trois sous pixels (100,101,102) selon la revendication 1 caractérisée en ce que le périmètre des sous pixels (101,102,103) comprend un cadre noir (400) qui cache les surfaces (201) non recouvertes par les gouttelettes de gel.dimension, composed of three sub-pixels (100, 101, 102) according to claim 1 characterized in that the perimeter of the sub-pixels (101, 102, 103) comprises a black frame (400) which hides the surfaces (201) not covered by the gel droplets.
5. Image renouvelable électroniquement obtenue par les pixels de l'invention, selon l'une quelconque des revendications 1 à A, caractérisée en ce que le gel opaque, recyclable, déposé par les têtes à jet d'encre, est de couleur noire. 5. Electronically renewable image obtained by the pixels of the invention, according to any one of claims 1 to A, characterized in that the opaque gel, recyclable, deposited by the ink jet heads, is black.
PCT/FR2008/000184 2007-04-27 2008-02-14 Electronically renewable image pixels WO2008139046A1 (en)

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FR0703065A FR2915613A1 (en) 2007-04-27 2007-04-27 PIXELS OF IMAGES RENEWABLE ELECTRONICALLY.
FR0703065 2007-04-27

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0669561A2 (en) * 1994-02-28 1995-08-30 Nec Corporation Method and apparatus for displaying color image
JP2002251150A (en) * 2001-02-26 2002-09-06 Canon Inc Image record display device
US20060158498A1 (en) * 2005-01-19 2006-07-20 Min-Soo Kim Color filter fabricating method using an inkjet process

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0669561A2 (en) * 1994-02-28 1995-08-30 Nec Corporation Method and apparatus for displaying color image
JP2002251150A (en) * 2001-02-26 2002-09-06 Canon Inc Image record display device
US20060158498A1 (en) * 2005-01-19 2006-07-20 Min-Soo Kim Color filter fabricating method using an inkjet process

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