EP0454551A1 - Method for displaying images on a dot matrix colour screen - Google Patents

Method for displaying images on a dot matrix colour screen Download PDF

Info

Publication number
EP0454551A1
EP0454551A1 EP91401050A EP91401050A EP0454551A1 EP 0454551 A1 EP0454551 A1 EP 0454551A1 EP 91401050 A EP91401050 A EP 91401050A EP 91401050 A EP91401050 A EP 91401050A EP 0454551 A1 EP0454551 A1 EP 0454551A1
Authority
EP
European Patent Office
Prior art keywords
pixels
dots
green
screen
color
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.)
Granted
Application number
EP91401050A
Other languages
German (de)
French (fr)
Other versions
EP0454551B1 (en
Inventor
Jean-Marie Soubrier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales Avionics SAS
Original Assignee
Thales Avionics SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Thales Avionics SAS filed Critical Thales Avionics SAS
Publication of EP0454551A1 publication Critical patent/EP0454551A1/en
Application granted granted Critical
Publication of EP0454551B1 publication Critical patent/EP0454551B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/20—Function-generator circuits, e.g. circle generators line or curve smoothing circuits

Definitions

  • the present invention relates to a display method on a dot matrix color screen and in particular on such screens used for viewing measurements.
  • the object of the present invention is to avoid or at least reduce these drawbacks.
  • FIG. 1 is the simplified diagram of a color display device, on a color dot matrix screen, 1, of images defined by a graphic microcomputer 2 which stores in a random access video memory, 3 , called VRAM memory (initials of the English words Video Random Access Memory), instructions for plotting items of information.
  • the video memory 3 comprises a random access memory, a shift register of the parallel-series type and a scanning circuit which makes it possible to automatically and cyclically transfer the lines from the random access memory to the shift register.
  • the shift register of the memory 3 provides, line by line, the information to be displayed on the screen.
  • pilot stage 4 (driver in Anglo-Saxon literature) composed of a series-parallel register followed by a locking register (latch in Anglo-Saxon literature), which has as many outputs as there are dots per screen line.
  • Screen 1 is associated with a line counter 5 which has as many outputs as screen 1 has lines; this counter authorizes the taking into account, in the lines of the screen for which they are intended, of information as and when they arrive in the pilot stage 4.
  • screen 1 is a screen of 480 x 480 elementary dots or dots, grouped in image elements or pixels formed by four dots in square, respectively white, green, red and blue when they are on, that is to say when information reaches them.
  • pilot stage while the line on which they are located is validated by the line counter 5.
  • Figure 2 shows how different colors are obtained from a pixel: each pixel is made of four dots, W, G, R, B, arranged in a square, each dot has a dot in the matrix, and the three dots G , R, B respectively comprise a green filter, a red filter and a blue filter arranged at the front of the screen with respect to the points; these three filters are in the form of squares of identical dimensions, joined together to form three-quarters of another square, the fourth quarter of which, which therefore does not have a filter, is directly above the point relating to the dot W.
  • the screen When the screen is lit from behind with white light, and the four dots are passing for the light of the rear lighting, the screen delivers, directly above these dots of respectively green, red and blue lights and at the level of the fourth dot, W, which is not associated with a filter, a white light and the light spot relative to the pixel is substantially a square. But there is a mixture of colors if more than one dot is passing in the pixel considered; this is how, when the four dots are passing, the central part, delimited in FIG. 2 by a circle in dashed lines, as well as the whole part not covered by a filter, is white while the parts covered by 'a filter and located outside the circle are the color of the filters.
  • an entire surface which can be reduced to a line, is made up of pixels, all the dots of which pass, there is an iridescence phenomenon on the edges of this surface.
  • the luminance level with the dots G, R , B is four times weaker than below the dot, W, which is not associated with a filter.
  • Figures 3a, 3b, 3c show how can be obtained, according to the known art, on screen 1, the image of a white line segment representative, for example, of a stopwatch needle; this segment rotates around a point, clockwise, and Figures 3a, 3b, 3c are three successive representations in time of this segment.
  • These three figures consist exclusively of pixels, the four dots of which pass through for light; each of these pixels of the line segment is therefore symbolized by a hatched square which, as has been seen with the aid of FIG. 2, represents the light spot relating to a pixel of which all the dots are passing.
  • FIGS. 3 show how, by thickening the line, compared to Figures 3a, 3b, 3c, it is known to reduce the effect of stair treads; but the phenomenon of iridescence remains.
  • This thickening process consists in surrounding the pixels which formed the substantially monochrome straight line segments of FIGS. 3 by pixels providing exactly the same lighting as those of the surrounded pixels, that is to say white lighting obtained with the four dots. passers-by.
  • the squares of the pixels, which were already lit in the case of FIGS. 3 have been hatched in FIGS. 4, and this will also be the case in FIGS. 5; these hatches are identical to those of FIGS. 3.
  • the pixels which have been added on the periphery of the segments according to FIGS. 3 have their squares which are hatched in a different direction.
  • the pixels where only the dot W, that is to say the dot not associated with a filter, is passing have been represented by squares four times smaller than the squares of the pixels where all the dots are passers-by.
  • FIG. 6 shows the squares of three neighboring pixels, P0, P1, P2 each having their four passing dots; this is what happens in Figures 4 when a pixel of a segment according to Figures 3 has been surrounded by pixels to thicken the segment.
  • FIG. 7 shows the squares of three neighboring pixels P0, P1, P2, of which the central pixel, PO, has its four passing dots and of which the other two pixels, P1, P2, only have the dot W which is passing; this is what happens in Figures 5 when a pixel of a snake according to Figures 3 has been surrounded by pixels where only the dot W was passing.
  • the very bright white central pixel is located between two less bright white pixels; so there was indeed a shade of gray.
  • an image produced by passing only a single dot in the pixels which surround a monochrome surface requires the microcomputer 2 of FIG. 1 less additional calculations than when there are two, three or four dots to make passers-by around the area under consideration.
  • the monochrome surface is made of pixels where only a dot with a filter is passing; these cases should be avoided in order to being able to surround the surface considered by pixels at least approximately of the same color but less bright.
  • FIG. 8 represents, in a line produced in this way, a pixel, where the dots G and W are passing, surrounded by two pixels where only the dot G is passing; thus the luminance is of level five times higher for the central pixel, since, as it was seen previously, the dot W has a luminance level four times higher than that of the dots G, R and B.
  • FIG. 9 represents a first pixel which is part of the central line with its passing dots G and R and two pixels arranged on either side of the central line, around the first pixel, with only their dot G passing; thus the luminance of the central line is twice as high as that of its surroundings.
  • the invention is not limited to the examples described with the aid of the figures which relate to lines; for larger monochromatic surfaces all the pixels of the surface will be controlled like the pixels of the central lines mentioned above, while the pixels of the periphery of this surface will be controlled like the pixels surrounding the pixels of a central line.
  • the invention relates, in general, to any method which consists, in viewing a monochrome area on a color dot matrix screen, in choosing a color which it is possible to obtain, at least approximately, from a first and second depending on the dowries making up the screen pixels, and with a luminance level per pixel higher in the case of the first way than that in the case of the second way; the method then consists in obtaining the color according to the first way with the pixels of the zone considered and in obtaining the color according to the second way with the pixels surrounding the zone considered.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

The structure of these screens leads to phenomena which disturb viewing, such as more particularly disturbing staircases with fine lines rotating around one of their ends. In order to avoid this and according to the invention, the colour of a monochrome area is chosen in such a way that it is possible to give the pixels (P1, P2) surrounding the area at least a colour close to that of the pixels (P0) of the area, but with lower luminance. Application, in particular, to the visual display of measurements. <IMAGE>

Description

La présente invention concerne un procédé de visualisation sur écran couleur à matrice de points et en particulier sur de tels écrans utilisés pour la visualisation de mesures.The present invention relates to a display method on a dot matrix color screen and in particular on such screens used for viewing measurements.

Sur un tel écran il est connu d'utiliser des teintes de gris (grey shadows dans la littérature anglo-saxonne) pour éviter des phénomènes de déformation du trait, du genre marche d'escalier, et des phénomènes de clignotement ; ces phénomènes ont tendance à apparaître autour des zones monochromes, étant entendu que toute image en couleur, sur un écran, est décomposable en un nombre fini de zones monochromes. En épaississant les traits monochromes et en commandant les teintes de gris des pixels de l'écran correspondant à cet épaississement, par exemple, par variation de largeur d'impulsions, il est en effet possible d'éviter ces phénomènes ; mais cela augmente sérieusement les calculs pour l'élaboration d'une image, cela nuit à la finesse des traits de l'image et cela ne permet pas d'éliminer le phénomène d'irisation sur les bords.On such a screen it is known to use shades of gray (gray shadows in Anglo-Saxon literature) to avoid phenomena of deformation of the line, of the kind of stair step, and flashing phenomena; these phenomena tend to appear around the monochrome areas, it being understood that any color image, on a screen, is decomposable into a finite number of monochrome areas. By thickening the monochrome lines and controlling the gray tones of the pixels of the screen corresponding to this thickening, for example, by variation of pulse width, it is indeed possible to avoid these phenomena; but this seriously increases the calculations for the development of an image, it harms the fineness of the lines of the image and it does not eliminate the phenomenon of iridescence on the edges.

La présente invention a pour but d'éviter ou, pour le moins, de réduire ces inconvénients.The object of the present invention is to avoid or at least reduce these drawbacks.

Ceci est obtenu en choisissant les couleurs des zones monochromes de telle sorte qu'il soit possible de donner aux pixels entourant ces zones au moins une couleur voisine de celle des pixels de la zone monochrome considérée mais avec une luminance inférieure.This is obtained by choosing the colors of the monochrome zones so that it is possible to give the pixels surrounding these zones at least one color close to that of the pixels of the monochrome zone considered but with a lower luminance.

Selon l'invention il est proposé un procédé de visualisation d'images sur écran couleur à matrice de points présentant des pixels identiques, composés de dots c'est-à-dire de points de la matrice dont certains sont associés à des filtres de couleur et dont les ouvertures sont à commandes indépendantes les unes des autres, caractérisé en ce qu'il consiste, pour visualiser une zone monochrome sur l'écran, à choisir une couleur qu'il soit possible d'obtenir, au moins approximativement, en commandant d'une première et d'une seconde manière les dots des pixels avec, pour un même signal d'ouverture des dots, une luminance par pixel supérieure dans le cas de la première manière à celui dans le cas de la seconde manière, à commander selon la première manière l'ouverture des dots des pixels situés dans la zone considérée et selon la seconde manière l'ouverture des dots des pixels entourant la zone considérée.According to the invention there is proposed a method for viewing images on a color screen with a matrix of points having identical pixels, composed of dots, that is to say points of the matrix, some of which are associated with color filters. and whose openings are independently controlled from each other, characterized in that it consists, in order to visualize a monochrome area on the screen, in choosing a color which it is possible to obtain, at least approximately, by ordering in a first and a second way the dots of the pixels with, for the same signal of aperture of the dots, a luminance per pixel higher in the case of the first way than that in the case of the second way, to be controlled in the first way the opening of the dots of the pixels located in the area considered and in the second way the opening of the dots of the pixels surrounding the area considered.

La présente invention sera mieux comprise et d'autres caractéristiques apparaîtront à l'aide de la description ci- après et des figures s'y rapportant qui représentent :

  • la figure 1, le schéma d'un dispositif de visualisation sur écran, utilisable aussi bien selon l'invention que selon l'art connu,
  • la figure 2 une vue agrandie d'un pixel de l'écran selon la figure 1,
  • les figures 3a, 3b, 3c des tracés, selon l'art antérieur et sans teinte de gris, d'une ligne tournante de couleur blanche sur un écran à matrice de points,
  • les figures 4a, 4b, 4c des tracés de la même ligne que sur les figures 3a, 3b, 3c, mais avec épaississement du trait selon l'art antérieur,
  • les figures 5a, 5b, 5c des tracés de la même ligne que sur les figures 2 et 4 mais avec teinte de gris selon l'invention,
  • les figures 6 et 7, des vues agrandies de parties de l'écran selon les figures 4 et 5,
  • les figures 8 et 9, des vues agrandies correspondant aux tracés selon les figures 5a, 5b, 5c mais avec un trait de couleur, respectivement vert et vert-rouge.
The present invention will be better understood and other characteristics will appear from the following description and the figures relating thereto which represent:
  • FIG. 1, the diagram of a display device on screen, usable both according to the invention and according to known art,
  • FIG. 2 an enlarged view of a pixel of the screen according to FIG. 1,
  • FIGS. 3a, 3b, 3c of the lines, according to the prior art and without gray tint, of a rotating line of white color on a dot matrix screen,
  • FIGS. 4a, 4b, 4c plots of the same line as in FIGS. 3a, 3b, 3c, but with thickening of the line according to the prior art,
  • FIGS. 5a, 5b, 5c of the plots of the same line as in FIGS. 2 and 4 but with a shade of gray according to the invention,
  • FIGS. 6 and 7, enlarged views of parts of the screen according to FIGS. 4 and 5,
  • Figures 8 and 9, enlarged views corresponding to the traces according to Figures 5a, 5b, 5c but with a color line, respectively green and green-red.

La figure 1 est le schéma simplifié d'un dispositif d'affichage en couleurs, sur un écran couleur à matrice de points, 1, d'images définies par un micro-ordinateur graphique 2 qui stocke dans une mémoire vidéo à accès aléatoire, 3, appelée mémoire VRAM (initiales des mots anglais Video Random Access Memory), des instructions de tracé d'éléments d'information. La mémoire vidéo 3 comporte une mémoire à accès aléatoire, un registre à décalage de type parallèle-série et un circuit de balayage qui permet de transférer automatiquement et cycliquement les lignes de la mémoire à accès aratoire dans le registre à décalage. Le registre à décalage de la mémoire 3 fournit, ligne par ligne, les informations à visualiser sur l'écran. Ces informations sont reçues par un étage pilote 4 (driver dans la littérature anglo-saxonne) composé d'un registre série-parallèle suivi d'un registre à verrouillage (latch dans la littérature anglo-saxonne), qui comporte autant de sorties que de points par ligne de l'écran. A l'écran 1 est associé un compteur de lignes 5 qui comporte autant de sorties que l'écran 1 a de lignes ; ce compteur autorise la prise en compte, dans les lignes de l'écran auxquelles elles sont destinés, des informations au fur et à mesure de leur arrivée dans l'étage pilote 4. Dans l'exemple décrit l'écran 1 est un écran de 480 x 480 points élémentaires ou dots, regroupés en éléments d'image ou pixels formés de quatre dots en carré, respectivement blanc, vert, rouge et bleu quand ils sont allumés c'est-à- dire quand une information leur parvient de l'étage pilote alors que la ligne sur laquelle ils se trouvent est validée par le compteur de lignes 5.FIG. 1 is the simplified diagram of a color display device, on a color dot matrix screen, 1, of images defined by a graphic microcomputer 2 which stores in a random access video memory, 3 , called VRAM memory (initials of the English words Video Random Access Memory), instructions for plotting items of information. The video memory 3 comprises a random access memory, a shift register of the parallel-series type and a scanning circuit which makes it possible to automatically and cyclically transfer the lines from the random access memory to the shift register. The shift register of the memory 3 provides, line by line, the information to be displayed on the screen. This information is received by a pilot stage 4 (driver in Anglo-Saxon literature) composed of a series-parallel register followed by a locking register (latch in Anglo-Saxon literature), which has as many outputs as there are dots per screen line. Screen 1 is associated with a line counter 5 which has as many outputs as screen 1 has lines; this counter authorizes the taking into account, in the lines of the screen for which they are intended, of information as and when they arrive in the pilot stage 4. In the example described, screen 1 is a screen of 480 x 480 elementary dots or dots, grouped in image elements or pixels formed by four dots in square, respectively white, green, red and blue when they are on, that is to say when information reaches them. pilot stage while the line on which they are located is validated by the line counter 5.

La figure 2 montre comment sont obtenues différentes couleurs à partir d'un pixel : chaque pixel est fait de quatre dots, W, G, R, B, disposés en carré, chaque dot comporte un point de la matrice, et les trois dots G, R, B comportent respectivement un filtre vert, un filtre rouge et un filtre bleu disposés à l'avant de l'écran par rapport aux points ; ces trois filtres se présentent sous la forme de carrés de dimensions identiques, accolés pour former les trois quarts d'un autre carré dont le quatrième quart, quine comporte donc pas de filtre, se trouve à l'aplomb du point relatif au dot W. Lorsque l'écran est éclairé, par derrière, à l'aide d'une lumière blanche, et que les quatre dots sont passants pour la lumière de l'éclairage arrière, l'écran délivre, à l'aplomb de ces dots des lumières respectivement vertes, rouges et bleues et au niveau du quatrième dot, W, qui n'est pas associé à un filtre, une lumière blanche et la tache lumineuse relative au pixel est sensiblement un carré. Mais il se produit un mélange de couleurs si plus d'un dot est passant dans le pixel considéré ; c'est ainsi que, lorsque les quatre dots sont passants, la partie centrale, délimitée sur la figure 2 par un cercle en traits interrompus, de même que toute la partie non recouverte d'un filtre, est blanche tandis que les parties recouvertes d'un filtre et situées en dehors du cercle sont de la couleur des filtres. Ainsi, quand toute une surface, qui peut se réduire à une ligne, est constituée de pixels dont tous les dots sont passants, il se produit un phénomène d'irisation sur les bords de cette surface.Figure 2 shows how different colors are obtained from a pixel: each pixel is made of four dots, W, G, R, B, arranged in a square, each dot has a dot in the matrix, and the three dots G , R, B respectively comprise a green filter, a red filter and a blue filter arranged at the front of the screen with respect to the points; these three filters are in the form of squares of identical dimensions, joined together to form three-quarters of another square, the fourth quarter of which, which therefore does not have a filter, is directly above the point relating to the dot W. When the screen is lit from behind with white light, and the four dots are passing for the light of the rear lighting, the screen delivers, directly above these dots of respectively green, red and blue lights and at the level of the fourth dot, W, which is not associated with a filter, a white light and the light spot relative to the pixel is substantially a square. But there is a mixture of colors if more than one dot is passing in the pixel considered; this is how, when the four dots are passing, the central part, delimited in FIG. 2 by a circle in dashed lines, as well as the whole part not covered by a filter, is white while the parts covered by 'a filter and located outside the circle are the color of the filters. Thus, when an entire surface, which can be reduced to a line, is made up of pixels, all the dots of which pass, there is an iridescence phenomenon on the edges of this surface.

Au sujet des quatre dots d'un même pixel il est à noter que, en raison des filtres, pour un même éclairage de l'écran et un même signal d'ouverture des dots, la luminance à l'aplomb des dots G, R, B est quatre fois plus faible qu'à l'aplomb du dot, W, qui n'est pas associé à un filtre.Regarding the four dots of the same pixel, it should be noted that, due to the filters, for the same screen lighting and the same dots aperture signal, the luminance level with the dots G, R , B is four times weaker than below the dot, W, which is not associated with a filter.

Les figures 3a, 3b, 3c montrent comment peut être obtenue, selon l'art connu, sur l'écran 1, l'image d'un segment de droite blanche représentatif, par exemple, d'une aiguille de chronomètre ; ce segment tourne autour d'un point, dans le sens des aiguilles d'une montre, et les figures 3a, 3b, 3c sont trois représentations successives dans le temps de ce segment. Ces trois figures sont constituées exclusivement de pixels dont les quatre dots sont passants pour la lumière ; chacun de ces pixels du segment de droite est donc symbolisé par un carré hachuré qui, comme il a été vu à l'aide de la figure 2, représente la tache lumineuse relative à un pixel dont tous les dots sont passants.Figures 3a, 3b, 3c show how can be obtained, according to the known art, on screen 1, the image of a white line segment representative, for example, of a stopwatch needle; this segment rotates around a point, clockwise, and Figures 3a, 3b, 3c are three successive representations in time of this segment. These three figures consist exclusively of pixels, the four dots of which pass through for light; each of these pixels of the line segment is therefore symbolized by a hatched square which, as has been seen with the aid of FIG. 2, represents the light spot relating to a pixel of which all the dots are passing.

Avec des images selon les figures 3a, 3b - et 3c les déformations en marches d'escalier sont importantes de même que le phénomène d'irisation dont il a été question lors de la description de la figure 2.With images according to FIGS. 3a, 3b - and 3c, the deformations in staircase steps are important, as is the phenomenon of iridescence which was discussed during the description of FIG. 2.

Les figures 4a, 4b, 4c montrent comment, en épaississant le trait, par rapport aux figures 3a, 3b, 3c, il est connu de réduire l'effet de marches d'escalier ; mais le phénomène d'irisation subsiste. Ce procédé d'épaississement consiste à entourer les pixels qui formaient les segments de droites sensiblement monochromes des figures 3 par des pixels fournissant exactement le même éclairage que ceux des pixels entourés, c'est-à- dire un éclairage blanc obtenu avec les quatre dots passants. Pour faciliter la compréhension du procédé, les carrés des pixels, qui étaient déjà éclairés dans le cas des figures 3, ont été hachurés sur les figures 4, et ce sera aussi le cas sur les figures 5 ; ces hachures sont identiques à celles des figures 3. Par contre, et bien qu'ils fournissent le même éclairage, les pixels qui ont été ajoutés sur le pourtour des segments selon les figures 3 ont leurs carrés qui sont hachurés dans un sens différent.Figures 4a, 4b, 4c show how, by thickening the line, compared to Figures 3a, 3b, 3c, it is known to reduce the effect of stair treads; but the phenomenon of iridescence remains. This thickening process consists in surrounding the pixels which formed the substantially monochrome straight line segments of FIGS. 3 by pixels providing exactly the same lighting as those of the surrounded pixels, that is to say white lighting obtained with the four dots. passers-by. To make the process easier to understand, the squares of the pixels, which were already lit in the case of FIGS. 3, have been hatched in FIGS. 4, and this will also be the case in FIGS. 5; these hatches are identical to those of FIGS. 3. On the other hand, and although they provide the same lighting, the pixels which have been added on the periphery of the segments according to FIGS. 3 have their squares which are hatched in a different direction.

Il est à noter qu'il est possible de réduire ce phénomène d'irisation au moyen de teintes de gris obtenues par une commande temporelle de l'ouverture à la lumière des dots, par exemple par une commande en dents de scie dont certaines dents sont supprimées ou par une commande par impulsion de largeur réglable ; mais une telle commande temporelle complique sérieusement la réalisation du dispositif de visualisation sur écran et le rend donc plus cher.It should be noted that it is possible to reduce this iridescence phenomenon by means of shades of gray obtained by a temporal control of the opening in the light of the dots, for example by a sawtooth control of which certain teeth are suppressed or by an adjustable width pulse command; but such a time control seriously complicates the production of the screen display device and therefore makes it more expensive.

Les figures 5a, 5b, 5c montrent comment les phénomènes de marches d'escalier mais aussi d'irisation observés avec une visualisation selon les figures 3 peuvent être fortement atténués sans rechercher une teinte de gris par commande temporelle. Pour cela les pixels qui formaient les segments de droites selon les figures 3 sont entourés de pixels où seul le dot W est passant ; il en résulte plusieurs conséquences :

  • l'irisation disparaît et les marches d'escalier sont fortement atténuées
  • une teinte de gris est obtenue autour du segment de droite,
  • la détermination de l'image demande moins de calculs de la part du micro-ordinateur que dans le procédé selon les figures 4 ;
ces deux dernières conséquences seront étudiées à l'aide des figures 6 et 7.FIGS. 5a, 5b, 5c show how the phenomena of stair treads but also of iridescence observed with a display according to FIGS. 3 can be strongly attenuated without seeking a shade of gray by time control. For this, the pixels which formed the line segments according to FIGS. 3 are surrounded by pixels where only the dot W is passing; this has several consequences:
  • the iridescence disappears and the stair treads are greatly reduced
  • a shade of gray is obtained around the line segment,
  • determining the image requires fewer calculations on the part of the microcomputer than in the method according to FIGS. 4;
these last two consequences will be studied using Figures 6 and 7.

Sur les figures 5 les pixels où seul le dot W, c'est-à- dire le dot non associé à un filtre, est passant, ont été représentés par des carrés quatre fois plus petits que les carrés des pixels où tous les dots sont passants.In FIGS. 5, the pixels where only the dot W, that is to say the dot not associated with a filter, is passing, have been represented by squares four times smaller than the squares of the pixels where all the dots are passers-by.

La figure 6 montre les carrés de trois pixels voisins, P0, P1, P2 ayant chacun leurs quatre dots passants ; c'est ce qui se produit dans les figures 4 quand un pixel d'un segment selon les figures 3 a été entouré de pixels pour épaissir le segment.FIG. 6 shows the squares of three neighboring pixels, P0, P1, P2 each having their four passing dots; this is what happens in Figures 4 when a pixel of a segment according to Figures 3 has been surrounded by pixels to thicken the segment.

La figure 7 montre les carrés de trois pixels voisins P0, P1, P2, dont le pixel central, PO, a ses quatre dots passants et dont les deux autres pixels, P1, P2, n'ont que le dot W qui est passant ; c'est ce qui se produit dans les figures 5 quand un pixel d'un serpent selon les figures 3 a été entouré de pixels où seul le dot W était passant. En attribuant le coefficient 1 à la luminance d'un dot associé à un filtre et, en fonction de ce qui a été dit plus avant, le coefficient 4 à la luminance d'un dot W, la quantité de lumière fournie par les trois pixels selon la figure 6 atteint le niveau 21 tandis qu'elle n'atteint que le niveau 15 dans le cas de la figure 7 : le pixel central blanc très lumineux se trouve entre deux pixels blancs moins lumineux ; il y a donc bien eu obtention d'une teinte de gris. De plus une image réalisée en ne rendant passant qu'un seul dot dans les pixels qui entourent une surface monochrome, demande au micro-ordinateur 2 de la figure 1 moins de calculs supplémentaires que lorsqu'il y a deux, trois ou quatre dots à rendre passants dans l'entourage de la surface considérée. Bien sûr il existe des cas où la surface monochrome est faite de pixels où seul un dot comportant un filtre est passant ; ces cas doivent être évités afin de pouvoir entourer la surface considérée par des pixels au moins approximativement de la même couleur mais moins lumineux.FIG. 7 shows the squares of three neighboring pixels P0, P1, P2, of which the central pixel, PO, has its four passing dots and of which the other two pixels, P1, P2, only have the dot W which is passing; this is what happens in Figures 5 when a pixel of a snake according to Figures 3 has been surrounded by pixels where only the dot W was passing. By assigning the coefficient 1 to the luminance of a dot associated with a filter and, according to what has been said above, the coefficient 4 to the luminance of a dot W, the amount of light provided by the three pixels according to FIG. 6 reaches level 21 while it only reaches level 15 in the case of FIG. 7: the very bright white central pixel is located between two less bright white pixels; so there was indeed a shade of gray. In addition, an image produced by passing only a single dot in the pixels which surround a monochrome surface, requires the microcomputer 2 of FIG. 1 less additional calculations than when there are two, three or four dots to make passers-by around the area under consideration. Of course there are cases where the monochrome surface is made of pixels where only a dot with a filter is passing; these cases should be avoided in order to being able to surround the surface considered by pixels at least approximately of the same color but less bright.

Ainsi une surface monochrome verte ne sera pas obtenue avec des pixels dont seul le dot G, qui comporte un filtre vert, sera passant, mais, par exemple, avec les dots G et W passants pour obtenir un vert lumineux, et le pourtour sera fait de pixels où seul le dot G sera passant ; la figure 8 représente, dans une ligne réalisée de cette manière, un pixel, où les dots G et W sont passants, entouré de deux pixels où seul le dot G est passant ; ainsi la luminance est de niveau cinq fois plus élevé pour le pixel central, étant donné que, comme il a été vu précédemment, le dot W a un niveau de luminance quatre fois supérieur à celui des dots G, R et B. Une autre possibilité pour obtenir du vert, mais cette fois du vert rouge, sera de rendre passants, dans une ligne centrale de pixels, les dots G et R, l'entourage étant alors fait de pixels où seul le dot vert sera passant ; cette possibilité est illustrée par la figure 9 qui représente un premier pixel qui fait partie de la ligne centrale avec ses dots G et R passants et deux pixels disposés de part et d'autre de la ligne centrale, autour du premier pixel, avec seulement leur dot G passant ; ainsi la luminance de la ligne centrale a un niveau deux fois supérieur à celui de son entourage.Thus a green monochrome surface will not be obtained with pixels of which only the dot G, which includes a green filter, will be passing, but, for example, with the dots G and W passing to obtain a bright green, and the periphery will be made pixels where only the dot G will be passing; FIG. 8 represents, in a line produced in this way, a pixel, where the dots G and W are passing, surrounded by two pixels where only the dot G is passing; thus the luminance is of level five times higher for the central pixel, since, as it was seen previously, the dot W has a luminance level four times higher than that of the dots G, R and B. Another possibility to obtain green, but this time red green, will be to make passers-by, in a central line of pixels, the dots G and R, the surrounding being then made of pixels where only the green dot will be passing; this possibility is illustrated by FIG. 9 which represents a first pixel which is part of the central line with its passing dots G and R and two pixels arranged on either side of the central line, around the first pixel, with only their dot G passing; thus the luminance of the central line is twice as high as that of its surroundings.

L'invention n'est pas limitée aux exemples décrits à l'aide des figures qui se rapportent à des lignes ; pour des surfaces monochromatiques plus larges tous les pixels de la surface seront commandés comme les pixels des lignes centrales mentionnées ci-avant, tandis que les pixels du pourtour de cette surface, seront commandés comme les pixels entourant les pixels d'une ligne centrale.The invention is not limited to the examples described with the aid of the figures which relate to lines; for larger monochromatic surfaces all the pixels of the surface will be controlled like the pixels of the central lines mentioned above, while the pixels of the periphery of this surface will be controlled like the pixels surrounding the pixels of a central line.

L'invention concerne, d'une façon générale, tout procédé qui consiste, pour visualiser une zone monochrome sur un écran couleur à matrice de points, à choisir une couleur qu'il soit possible d'obtenir, au moins approximativement, d'une première et d'une seconde manière en fonction des dots composant les pixels de l'écran, et avec un niveau de luminance par pixel supérieur dans le cas de la première manière à celui dans le cas de la seconde manière ; le procédé consiste ensuite à obtenir la couleur selon la première manière avec les pixels de la zone considérée et à obtenir la couleur selon la seconde manière avec les pixels entourant la zone considérée.The invention relates, in general, to any method which consists, in viewing a monochrome area on a color dot matrix screen, in choosing a color which it is possible to obtain, at least approximately, from a first and second depending on the dowries making up the screen pixels, and with a luminance level per pixel higher in the case of the first way than that in the case of the second way; the method then consists in obtaining the color according to the first way with the pixels of the zone considered and in obtaining the color according to the second way with the pixels surrounding the zone considered.

Claims (4)

Procédé de visualisation d'images sur écran couleur à matrice de points présentant des pixels identiques, composés de dots (W, G, R, B) c'est-à-dire de points de la matrice dont certains sont associés à des filtres de couleur et dont les ouvertures sont à commandes indépendantes les unes des autres, caractérisé en ce qu'il consiste, pour visualiser une zone monochrome sur l'écran (1), à choisir une couleur qu'il soit possible d'obtenir, au moins approximativement, en commandant d'une première et d'une seconde manière les dots des pixels avec, pour un même signal d'ouverture des dots, une luminance par pixel supérieure dans le cas de la première manière à celui dans le cas de la seconde manière, à commander selon la première manière l'ouverture des dots des pixels situés dans la zone considérée et selon la seconde manière l'ouverture des dots des pixels entourant la zone considérée.Method for viewing images on a color matrix screen of points having identical pixels, composed of dots (W, G, R, B), that is to say points of the matrix, some of which are associated with color and whose openings are independently controlled from each other, characterized in that it consists, in order to visualize a monochrome area on the screen (1), in choosing a color which it is possible to obtain, at least approximately, by controlling in a first and a second way the dots of the pixels with, for the same signal of aperture of the dots, a luminance per pixel higher in the case of the first way than that in the case of the second in this way, in the first way, controlling the opening of the dots of the pixels located in the area considered and in the second way controlling the opening of the dots of the pixels surrounding the area considered. Procédé selon la revendication 1, mis en oeuvre avec un écran (1) dont les pixels sont constitués de quatre dots respectivement blanc (W), vert (G), rouge (R) et bleu (B), caractérisé en ce qu'il consiste, pour obtenir une couleur blanche, à commander l'ouverture de tous les dots des pixels situés dans la zone considérée et à commander la seule ouverture des dots vert (G), rouge (R) et bleu (B) des pixels entourant la zone considérée.Method according to claim 1, implemented with a screen (1) whose pixels consist of four dots respectively white (W), green (G), red (R) and blue (B), characterized in that it consists, in order to obtain a white color, in ordering the opening of all the dots of the pixels located in the zone considered and in ordering only the opening of the green (G), red (R) and blue (B) dots of the pixels surrounding the area considered. Procédé selon la revendication 1 mis en oeuvre avec un écran (1) dont les pixels sont constitués de quatre dots respectivement blanc (W), vert (G), rouge (R) et bleu (B), caractérisé en ce qu'il consiste, pour obtenir une couleur verte, à commander l'ouverture des dots blanc (W) et vert (G) des pixels situés dans la zone considérée et à commander l'ouverture du dot vert (G) des pixels entourant la zone considérée.Method according to claim 1 implemented with a screen (1) whose pixels consist of four dots respectively white (W), green (G), red (R) and blue (B), characterized in that it consists , to obtain a green color, to command the opening of the white (W) and green (G) dots of the pixels located in the zone considered and to command the opening of the green dot (G) of the pixels surrounding the zone considered. Procédé selon la revendication 1, mis en oeuvre avec un écran (1) dont les pixels sont constitués de quatre dots respectivement blanc (W), vert (G), rouge (R) et bleu (B), caractérisé en ce qu'il consiste, pour obtenir une couleur verte, à commander l'ouverture des dots vert ( G ) et rouge ( R ) des pixels situés dans la zone considérée et à commander l'ouverture du dot vert (G) des pixels entourant la sone considérée.Method according to claim 1, implemented with a screen (1) whose pixels consist of four dots respectively white (W), green (G), red (R) and blue (B), characterized in that it consists, in order to obtain a green color, in ordering the opening of the green (G) and red (R) dots of the pixels located in the area considered and in ordering the opening of the green dot (G) of the pixels surrounding the area considered.
EP19910401050 1990-04-24 1991-04-19 Method for displaying images on a dot matrix colour screen Expired - Lifetime EP0454551B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9005190 1990-04-24
FR9005190A FR2661305B1 (en) 1990-04-24 1990-04-24 METHOD FOR VIEWING IMAGES ON A DOT MATRIX COLOR SCREEN.

Publications (2)

Publication Number Publication Date
EP0454551A1 true EP0454551A1 (en) 1991-10-30
EP0454551B1 EP0454551B1 (en) 1995-02-22

Family

ID=9396018

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910401050 Expired - Lifetime EP0454551B1 (en) 1990-04-24 1991-04-19 Method for displaying images on a dot matrix colour screen

Country Status (4)

Country Link
EP (1) EP0454551B1 (en)
JP (1) JPH04226491A (en)
DE (1) DE69107505T2 (en)
FR (1) FR2661305B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022178666A1 (en) * 2021-02-23 2022-09-01 深圳市艾比森光电股份有限公司 Led display screen and display control method therefor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU6512199A (en) * 1998-10-07 2000-04-26 Microsoft Corporation Mapping samples of foreground/background color image data to pixel sub-components

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4800375A (en) * 1986-10-24 1989-01-24 Honeywell Inc. Four color repetitive sequence matrix array for flat panel displays
EP0330361A2 (en) * 1988-02-16 1989-08-30 General Electric Company Color display device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4800375A (en) * 1986-10-24 1989-01-24 Honeywell Inc. Four color repetitive sequence matrix array for flat panel displays
EP0330361A2 (en) * 1988-02-16 1989-08-30 General Electric Company Color display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022178666A1 (en) * 2021-02-23 2022-09-01 深圳市艾比森光电股份有限公司 Led display screen and display control method therefor

Also Published As

Publication number Publication date
DE69107505T2 (en) 1995-07-13
JPH04226491A (en) 1992-08-17
EP0454551B1 (en) 1995-02-22
FR2661305A1 (en) 1991-10-25
DE69107505D1 (en) 1995-03-30
FR2661305B1 (en) 1993-12-24

Similar Documents

Publication Publication Date Title
BE1018662A3 (en) IMAGE DISPLAY DEVICE AND DISPLAY UNIT FOR IMAGE DISPLAY DEVICE.
CA2883724C (en) Display screen, in particular for autostereoscopy
FR2703814A1 (en) Color matrix display.
JPH02146081A (en) Multi-color image display method and apparatus
EP1510799A1 (en) Colour measuring method and device
EP0311500A1 (en) Half-tone display method for a matrix screen
WO2000011643A1 (en) Display system with matrix screen, adapted to low ambient lighting
FR2479622A1 (en) METHOD FOR SMOOTHING CURVES GENERATED BY TELEVISION SCANNING
EP0976122B1 (en) Matrix display addressing device
NL8900637A (en) DISPLAY FOR COLOR RENDERING.
WO1991011075A1 (en) Process and device for the automatic correction of geometry, superposition of colours and uniformity of image for a television camera
EP0349404B1 (en) Gigantic liquid crystal display
EP0454551B1 (en) Method for displaying images on a dot matrix colour screen
JP4878897B2 (en) Image projection method
EP0305287B1 (en) Colour image display system with a matrix screen
EP0993186B1 (en) Method for correcting jitter and flicker effects of video image pixel inlays
EP0472463B1 (en) Method for displaying images on a matrix screen and system for carrying out this method
JP3550347B2 (en) Display method
FR2988890A1 (en) METHOD AND DEVICE FOR REDUCING THE RECIPROCAL INFLUENCE OF IMAGE POINTS OF A GROUP OF IMAGE POINTS
Tsuchida et al. Development of a high-definition and multispectral image capturing system for digital archiving of early modern tapestries of Kyoto Gion Festival
CA3119232A1 (en) Device and method for observing a scene comprising a target
US11222408B1 (en) Method to smooth edge of image
WO2005088986A1 (en) System for the sequential illumination of an imager and a device comprising colour segments which can be used in said system
US7239327B2 (en) Method of processing an image for display and system of same
WO2024105312A1 (en) Method for colorizing an infrared image

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE GB IT

17P Request for examination filed

Effective date: 19920213

17Q First examination report despatched

Effective date: 19940609

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE GB IT

ITF It: translation for a ep patent filed

Owner name: JACOBACCI & PERANI S.P.A.

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19950315

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19950317

Year of fee payment: 5

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19950224

REF Corresponds to:

Ref document number: 69107505

Country of ref document: DE

Date of ref document: 19950330

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19960419

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19960419

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19970101

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050419