EP0976122B1 - Matrix display addressing device - Google Patents

Description

The present invention relates to a device for addressing a matrix screen such as a screen of the LCD or plasma type.

The display surfaces of such screens generally comprise a plurality of sub-pixels P (i, j) representing one of the primary colors R, G or B and addressed through a crossed network of N horizontal lines and M vertical columns. , each sub-pixel receiving through a switch which connects it to the adjacent column, during the addressing phase (line time), a sampled video signal.

The spatial resolution of such screens depends on the number and mode of combinations of addressable sub-pixels used to make displayable pixels whose successive sequences constitute the lines and video columns of the image to be displayed.

The figure 1 illustrates a known mode of subpixel combination, called L mode, used to address an orthogonal screen and consisting of making a displayable pixel by combining three subpixels R, V and B on the same line. In this case, the horizontal resolution, denoted Hr, is equal to M / 3, and is reduced with respect to the vertical resolution, denoted Hv, whose value is equal to N. Indeed, the construction of a VGA screen of 480 lines and 640 columns using the combination mode L, requires a number of columns M equal to 640 * 3 = 1920, and a number of lines N equal to 480. In addition, in order to respect the format of the image, this Combination mode requires a high number of subpixels which significantly increases the cost of the screen.

In addition, since matrix screens can only be addressed in progressive mode, the mode of combination described in figure 1 requires the use of an algorithm to adapt the screen to a source of interlaced images.

The Figures 2 and 3 respectively illustrate a first variant and a second variant of a second known mode of subpixel combination, called Delta mode, used to address a DELTA type screen. Like the L mode, a displayable pixel is obtained by combining three sub-pixels R, V and B located on the same horizontal line. However, in the first variant of the Delta mode, shown in figure 2 two successive lines are offset horizontally with respect to each other by half a sub-pixel, whereas in the second variant, represented at figure 3 two sucessive lines are horizontally offset from each other by one subpixel and a half. As a result, in the first case, a column of displayable pixels has a width equal to three and a half times the width of a subpixel while in the second case, a column of displayable pixels has a width equal to four times and half that of a sub-pixel. In the first case, the horizontal resolution is reduced by three and a half times the vertical resolution, while in the second case the horizontal resolution is reduced by four and a half times the vertical resolution. .
It is also described in the patent US 4,985,698 a device for addressing a matrix screen constituted by a storage stage comprising two line memories, this stage being placed between an input multiplexer and an output multiplexer. Both memories operate in a known manner called "ping-pong".
The object of the invention is to provide a device for addressing a matrix screen to improve the horizontal resolution without degrading the vertical resolution.

The device according to the invention comprises a storage stage 70 and 198 receiving, via a demultiplexing stage 220, a plurality of digital data sequences representing the luminance video signals previously digitized and delivering said luminance video signals to a multiplexing stage 230 for selecting a sequence digital data corresponding to a given combination of sub-pixels of the image to be displayed using, according to said given combination, the digital data previously stored in said storage stage 70 and 198.

Thus, the device according to the invention allows to select a combination of sub-pixels to obtain a better compromise between the vertical resolution and the horizontal resolution regardless of the type of screen used.

• la figure 1 illustre partiellement un premier mode de combinaison des sous-pixels R, V et B d'un écran matriciel du type orthogonal, utilisé dans l'art antérieur ;
• les figures 2 et 3 illustrent une application du mode de combinaison de sous-pixels de la figure 1 à un écran du type Delta ;
• la figure 4 illustre partiellement un premier mode de combinaison des sous-pixels R, V et B d'un écran matriciel réalisé par un dispositif d'adressage conforme à l'invention appliqué à un écran du type orthogonal ;
• la figure 5 illustre partiellement une première variante du mode de combinaison des sous-pixels R, V et B illustré à la figure 4 ;
• la figure 6 illustre une deuxième variante du mode de combinaison des sous-pixels R, V et B illustré à la figure 4 ;
• les figures 7a et 7b illustrent partiellement une troisième et une quatrième variante du mode de combinaison des sous-pixels R, V et B illustré à la figure 4 appliqué à un écran matriciel du type Delta ;
• la figure 8 illustre partiellement un deuxième mode de combinaison des sous-pixels R, V et B réalisé par un dispositif d'adressage conforme à l'invention appliqué à un écran matriciel du type orthogonal ;
• la figure 9 illustre partiellement une cinquième variante du mode de combinaison des sous-pixels R, V et B illustré à la figure 4 appliqué à un écran matriciel du type Delta ;
• la figure 10 représente partiellement un premier mode de réalisation d'un dispositif d'adressage conforme à l'invention ;
• la figure 11 représente partiellement un deuxième mode de réalisation d'un dispositif d'adressage conforme à l'invention ;
• les figures 12 à 14 représentent des schémas explicatifs du fonctionnement du dispositif d'adressage de la figure 10 ;
• les figures 15 et 16 représentent des schémas explicatifs du fonctionnement du dispositif d'adressage de la figure 11.

Other features and advantages of the invention will emerge from the description which follows, taken by way of non-limiting example, with reference to the appended figures in which:

• the figure 1 partially illustrates a first mode of combining the R, G and B sub-pixels of an orthogonal type matrix screen used in the prior art;
• the Figures 2 and 3 illustrate an application of the subpixel combination mode of the figure 1 a Delta type screen;
• the figure 4 partially illustrates a first combination mode of the sub-pixels R, G and B of a matrix screen produced by an addressing device according to the invention applied to a screen of the orthogonal type;
• the figure 5 partially illustrates a first variant of the combination mode of the sub-pixels R, V and B illustrated in FIG. figure 4 ;
• the figure 6 illustrates a second variant of the combination mode of the sub-pixels R, V and B illustrated in FIG. figure 4 ;
• the figures 7a and 7b partially illustrate a third and a fourth variant of the combination mode of sub-pixels R, V and B shown in figure 4 applied to a matrix screen of the Delta type;
• the figure 8 partially illustrates a second combination mode of the subpixels R, V and B made by an addressing device according to the invention applied to an orthogonal type matrix screen;
• the figure 9 partially illustrates a fifth variant of the combination mode of the sub-pixels R, V and B illustrated in FIG. figure 4 applied to a matrix screen of the Delta type;
• the figure 10 partially represents a first embodiment of an addressing device according to the invention;
• the figure 11 partially represents a second embodiment of an addressing device according to the invention;
• the Figures 12 to 14 represent diagrams explaining the operation of the addressing device of the figure 10 ;
• the figures 15 and 16 represent diagrams explaining the operation of the addressing device of the figure 11 .

The figure 10 schematically illustrates a device for addressing a matrix screen whose surface comprises a plurality of sub-pixels R, V and B each receiving a luminance video signal. These pixels are distributed over the surface of the screen in a network of N physical lines and M physical columns at the intersections of which are arranged switches such as TFT (Thin Film Transistors in English) in the case of LCD screens. These switches make it possible to connect, during the addressing phase, the pixels addressed to the physical columns.

According to the invention, the addressing device comprises a storage stage 70 and 198 receiving, via a demultiplexing stage 220, a plurality of digital data sequences representing the luminance video signals previously digitized and delivering said luminance video signals to a multiplexing stage 230 for selecting a sequence of digital data corresponding to a given combination of subpixels among the plurality of digital data sequences previously stored in said storage stage 70 and 198.

According to a first embodiment of the addressing device according to the invention, the storage stage 70 comprises a first memory 80 dedicated to the storage of the digital data resulting from the sampling of the signals sent to the sub-pixels R, a second memory 82 dedicated to the storage of the digital data resulting from the sampling of the signals sent to the sub-pixels V and a third memory 84 dedicated to storing the digital data resulting from the sampling of the signals sent to the sub-pixels B. In this mode of embodiment, the storage stage 70 is connected, on the one hand, to a writing control means 72, digital data in the memories 80, 82 and 84 and, on the other hand, to a reading control means 74 of said data from the memories 80, 82 and 84, said write control means 72 and read 74 are connected to a first synchronization means 76 write phases and p reading hashes.
According to this embodiment, each of the memories 80, 82 and 84 comprises two distinct zones, ie a first zone 102 in which the digital data relating to the subpixels R, G and B of a given video line are written during a phase. given writing, and a second zone 104 from which are read, during said write phase, the digital data relating to the sub-pixels R, G and B of a video line written during the previous write phase.

According to a second embodiment of the addressing device according to the invention, the storage stage 198 comprises two parallel branches, ie a first branch in which is arranged a block 200 comprising at least three FIFO cells, or a first stack 202, a second stack 204 and a third stack 206 for respectively holding the video data relating to the sub-pixels R, G and B located on one of the physical lines constituting an even video line, and a second branch in which is arranged a block 210 also comprising at least three FIFO cells, namely a fourth stack 212, a fifth stack 214 and a sixth stack 216 intended respectively to hold the video data relating to the sub-pixels R, V and B located on one of the physical lines constituting an odd video line.

In this embodiment, the demultiplexing stage 220, on the one hand, the data relating to the sub-pixels R, V and B belonging to the odd video columns to the block 200 so as to write said data, during a phase for writing a video line of duration D, respectively in the first stack 202, the second stack 204 and the third stack 206, and on the other hand, the data relating to the sub-pixels R, V and B belonging to the columns video pairs to the block 210, so as to write said data, during the write phase, respectively in the fourth stack 212, the fifth stack 214 and the sixth stack 21 6.

According to this second embodiment, a second synchronization means 240 is connected, on the one hand, to the demultiplexing stage 220 and delivers to this stage 220 a first periodic signal OW of frequency F controlling the writing of the relative video data. with sub-pixels R, V and B located on a odd video column respectively in the first stack 202, in the second stack 204 and in the third stack 206, and a second periodic signal EW of frequency F controlling the writing of the video data relating to the sub-pixels R, G and B located on a video column pair respectively in the fourth stack 212, in the fifth stack 214 and in the sixth stack 216. This second synchronization means 240 is connected on the other hand, to the multiplexing stage 230, and delivers to this stage 230 a third periodic signal RD of frequency 2 * F controlling the reading of the video data relating to the sub-pixels of an even (odd) video line selected by the multiplexing stage 230.

The multiplexing stage 230 selects at a frequency 1 / D, starting from a date coinciding with half the duration D, a sequence of data representing the sub-pixels belonging to a video line to be displayed previously stored in the memory. one of the cells 202, 204, 206, 212, 214 or 216.

The figure 12 illustrates an exemplary addressing of a Delta type screen, partially shown, by means of a device according to the invention. The successive pixels PXk (k = 1, 2, 3, etc.) of the video lines 35, 37 and 64 are designated according to their respective spatial positions, indicated by the index k. Each pixel is constituted by the combination of three sub-pixels Rk, Vk and Bk. The signals SIG1, SIG2, SIG3 represent the samples of the luminance signals sent respectively to the subpixels Rk, Vk and Rk, situated on the same video column. Thus the sub-pixels of the physical line Li respectively receive three sequences SIG1, SIG2, SIG3 respectively comprising the samples R1, R3, R5, ..., V1, V3, V5, ..., and B2, B4, B6, ..., while the sub-pixels of the physical line Li + 1 respectively receive three sequences SIG1, SIG2, SIG3 respectively comprising the samples R2, R4, R6, ..., V2, V4, V6, ..., and B3, B5, B7.

The figure 14 illustrates the phase during which the writing of the data relating to the sub-pixels R, V and B of a video line LV is performed, and secondly, the reading of the data relating to the sub-pixels. pixels R, V and B of the previous video line LV-1, then the next phase, during which is performed, on the one hand, the writing of the data relating to the sub-pixels R, G and B of a line LV + 1 video, and secondly, reading the data relating to the sub-pixels R, G and B of the video line LV written during the previous phase.

As has been previously explained, the writing of said video line LV and the reading of said video line LV-1 are done simultaneously and are synchronized by the first synchronization means 76 which sends to the write control means 72 and the means 74, a signal W / R, shown in FIG. figure 14 , allowing, on the one hand, to progressively write the video data relating to the sub-pixels R, G or B, and on the other hand, to read said data corresponding to the respective spatial positions of each of the sub-pixels R , V and B on the screen.

The write phase of the LV line is illustrated by the lines RSTW, WAB, WDA, and W / R while the reading phase of the line LV-1 is illustrated by the lines RSTR, RVAB, RVRDA, BDA, BRDA .

The line RSTW represents an initialization signal of the write phase, the line WAB represents the successive addresses in the memories 80, 82, 84 in which the digital data representing the samples Rk, Vk and Bk will be stored successively. The line WDA represents said digital data transported respectively by data buses 86, 88, 90. The line W / R represents the synchronization signal of the successive write and read phases sent by the first synchronization means 76. RSTR represents a signal initialization of the reading phase. The line RVAB represents the successive addresses in the memories 80, 82 and 84 in which are already stored the digital data representing the samples Rk, Vk. The line RVRDA represents the data Rk, Vk read respectively on data buses 94 and 96. The line BAB represents the successive addresses in the memories 80, 82 and 84 in which are already stored the digital data representing the samples Bk, the line BRDA the Bk data read on bus 92.

The data Rk, Vk and Bk represented on the line WDA are written progressively, while the data RVRDA and BRDA, previously written, are read correlatively to their respective positions on the surface of the screen.

The figure 1 5 partially illustrates a stack 202 and a stack 210 and the figure 16 illustrates the phase during which, on the one hand, the writing of the data relating to the subpixels R, G and B of a video line LV, and on the other hand, the phase during which the reading data relating to the sub-pixels R, G and B of said video line LV previously written in the cells 202 and 210, then the phase, during which is performed, on the one hand, the writing of the data relating to the sub -pixels R, V and B of the video line LV + 1, and secondly, the phase during which the data relating to the sub-pixels R, G and B of said video line LV + 1 are read, previously written in the cells 202 and 210. The synchronization of said write and read phases is performed by means of a second synchronization means 240 providing, on the one hand, to the demultiplexing stage 220 a first signal OW period of frequency F controlling the writing of the video data relating to the sub-pixels R, V and B situated on an odd video column respectively in the cells 202, 204 and 206, and a second periodic signal EW of frequency F controlling the writing of the video data relating to the subpixels R, G and B located on a video column pair respectively in the piles 212, 214 and 216, and on the other hand, at the multiplexing stage 230 a third periodic signal RD of frequency 2 * F controlling the reading of the video data relating to the sub-pixels of an even (odd) video column selected by the multiplexing stage 230.

On the figure 16 the line IE represents an initialization signal of the write phase, the line OW represents the control signal of the writing of the video data relating to the subpixels R, G and B located on an odd video column, the EW line represents the control signal of the writing of the video data relating to the subpixels R, G and B located on an even video column, the line WDA represents the digital data to be written in the cells 202 and 210, the line IL represents an initialization signal of the read phase, the line RDA represents the data read, the line OEE represents a selection signal of the data relating to the subpixels R, V and B located on an odd video column, the line EOE represents a signal for selecting the data relating to the subpixels R, V and B situated on an even video column. As can be seen on the lines OW, the writing in the stack 202 of the video data relating to the sub-pixels R, G and B located on an odd video column is synchronized on each rising edge of the signal OW. Likewise, the writing, in the stack 210, of the video data relating to the subpixels R, V and B situated on an even video column is synchronized on each rising edge of the signal EW. The RD signal for reading the digital data has a frequency twice that of the OW and EW signals. Therefore, in order to synchronize, with the frequency of a video line, the total duration of the reading phases of the data relating to the subpixels R, G and B located on an odd video column and those relating to the sub-pixels R, V and B located on an even video column, said read phases start when the batteries 202 and 212 are half full. So in the example of the figure 16 , the odd data are read at each rising edge of the signal RD from a time coinciding with the writing, of the 321 nth data, located in this example at half of the stack 202, and when the OEE signal has a logic level High. In parallel, the even data are read at each rising edge of the signal RD at a time coinciding with the writing, in the stack 212, of the 321 nd data when the signal EOE has a high logic level.
The Figures 4 to 9 illustrate a combination of sub-pixels in which two physical lines Li and Li + 1 are used to form a video line of the image to be displayed, and said image is decomposed into an odd field 9, 11, 13, 15, 17, 19 and 20 comprising odd video lines 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47 and 49, and an even frame 40, 42, 44, 46, 48, 50 and 52 comprising paired video lines 54, 56, 58, 60, 62, 64, 65, 66, 67 and 68, said odd and even fields being shifted, relative to one another, physical line, so as to allow interleaving of the odd video lines with the even video lines.

As can be seen on each of Figures 4 to 8 the physical lines Li used to constitute the video lines 54, 56, 58, 64, 65 and 67 are also used to constitute the physical lines Li + 1 of the odd video lines 21, 25, 29, 35, 39 and 43 respectively. This allows interleaving of said even video lines and said odd video lines.

According to a first example of application of the addressing device according to the invention illustrated by the Figures 4 to 7b and 9 , the multiplexing stage 220 selects the digital signal sequences relating to two contiguous sub-pixels located on the physical line Li (respectively Li + 1) and to a sub-pixel located on the physical line Li + 1 (respectively Li) , then the digital signal sequences relating to a sub-pixel located on the line Li (respectively Li + 1) and two sub-pixels located on the line Li + 1 (respectively Li) to address pixel of a video line of the image to display.

According to a second example of application of the addressing device according to the invention illustrated by the figure 8 , the multiplexing stage 220 selects the digital signal sequences relating to a first sub-pixel located on the physical line Li and the digital signal sequences relating to a second sub-pixel adjacent to the first sub-pixel, and located on the physical line Li + 1 to address a pixel of the video line 43 and 45 (respectively 67).

This combination mode is particularly suitable for uses that do not require a good colorimetry but rather require a good fineness of detail, insofar as on the one hand, it makes it possible to triple the horizontal resolution with respect to the modes of combination of the prior art described above, and secondly, it causes spectrum folds known as English colored aliasing producing an iridescence of the details of the displayed image.

The sampling of the video signals sent to the combined sub-pixels is carried out either simultaneously or in spatial mode, that is to say at different times corresponding to the respective positions of said sub-pixels on the surface of the screen.

• les signaux vidéo envoyés aux sous-pixels p(i,j) et p(i + 1, j) représentant respectivement les couleurs primaires R et V pour constituer les premiers pixels affichables de la ligne vidéo impaire 43 et 45, puis les signaux vidéo envoyés aux sous-pixels p(i,j + 1) et p(i + 1,j + 1) représentant respectivement les couleurs primaires V et B pour constituer les deuxièmes pixels affichables desdites lignes vidéo impaires 43 et 45, et pour deux lignes physiques Li et Li + 1 données située sur la trame paire 50, on échantillonne :
  • les signaux vidéo envoyés aux sous-pixels p(i,j) et p(i + 1 ,j) représentant respectivement les couleurs primaires V et R pour constituer le premier pixel affichable de la ligne vidéo paire 67, puis les signaux vidéo envoyés aux sous-pixels p(i, j + 1) et p(i + 1 ,j + 1) représentant respectivement les couleurs primaires B et V pour constituer le deuxième pixel affichable de ladite ligne vidéo paire 67.

Thus, by designating by i and j the relative positions of the sub-pixels respectively on the rows and on the physical columns of the matrix screen, for j periodically varying from 1 to M, and for two physical lines Li and Li + 1 data located on the odd field 19, in a first example of addressing, we sample:

• the video signals sent to the subpixels p (i, j) and p (i + 1, j) respectively representing the primary colors R and V to constitute the first displayable pixels of the odd video line 43 and 45, and then the video signals sent to the subpixels p (i, j + 1) and p (i + 1, j + 1) respectively representing the primary colors V and B to form the second displayable pixels of the said odd video lines 43 and 45, and for two lines physical Li and Li + 1 data located on the even frame 50, is sampled:
  • the video signals sent to the sub-pixels p (i, j) and p (i + 1, j) respectively representing the primary colors V and R to constitute the first displayable pixel of the video line pair 67, and then the video signals sent to the subpixels p (i, j + 1) and p (i + 1, j + 1) respectively representing the primary colors B and V to constitute the second displayable pixel of said even video line 67.

• les signaux vidéo envoyés aux sous-pixels p(i,j), p(i, j + 1) et p(i + 1, j) représentant respectivement les couleurs primaires R, V et B pour constituer le premier pixel affichable de la ligne vidéo impaire 21 et 23, puis les signaux vidéo envoyés aux sous-pixels p(i,j + 2), p(i + 1,j + 1) et p(i + 1,j + 2) représentant respectivement les couleurs primaires B, R et V pour constituer le pixel suivant de ladite ligne vidéo impaire 21 et 23, et pour deux lignes physiques Li et Li + 1 données situées sur la trame paire 40, on échantillonne :
  • les signaux vidéo envoyés aux sous-pixels p(i,j), p(i + 1, j) et p(i + 1 ,j + 1) représentant respectivement les couleurs primaires B, R et V pour constituer le premier pixel affichable de la ligne vidéo paire 54, puis les signaux vidéo envoyés aux sous-pixels p(i,j + 1), p(i,j + 2) et p(i + 1,j + 2) représentant respectivement les couleurs primaires R, V et B pour constituer le pixel suivant de ladite ligne vidéo paire 54.

In a second example of addressing, applied to a screen of the orthogonal type, illustrated by the figure 4 , for j periodically varying from 1 to M in steps of 3, and for two physical lines Li and Li + 1 given on the odd field 9, we sample:

• the video signals sent to the sub-pixels p (i, j), p (i, j + 1) and p (i + 1, j) respectively representing the primary colors R, V and B to constitute the first displayable pixel of the odd video line 21 and 23, then the video signals sent to the sub-pixels p (i, j + 2), p (i + 1, j + 1) and p (i + 1, j + 2) respectively representing the colors B, R and V primary to constitute the next pixel of said odd video line 21 and 23, and for two physical lines Li and Li + 1 data located on the even frame 40, is sampled:
  • the video signals sent to the sub-pixels p (i, j), p (i + 1, j) and p (i + 1, j + 1) respectively representing the primary colors B, R and V to constitute the first displayable pixel of the video line pair 54, then the video signals sent to the sub-pixels p (i, j + 1), p (i, j + 2) and p (i + 1, j + 2) respectively representing the primary colors R , V and B to constitute the next pixel of said paired video line 54.

• les signaux vidéo envoyés aux sous-pixels p(i,j + 1), p(i + 1 ,j) et p(i+1 ,j+1) représentant respectivement les couleurs primaires V, B et R pour constituer le premier pixel affichable de la ligne vidéo impaire 25 et 27, puis les signaux vidéo envoyés aux sous-pixels p(i,j+2), p(i,j + 3) et p(i + 1, j + 2) représentant respectivement les couleurs primaires B, R et V pour constituer le pixel suivant de ladite ligne vidéo impaire 25 et 27, et pour deux lignes physiques Li et Li + 1 données situées sur la trame paire 42, on échantillonne :
  • les signaux vidéo envoyés aux sous-pixels p(i,j), p(i, j + 1) et p(i + 1 ,j + 1) représentant respectivement les couleurs primaires B, R et V pour constituer le premier pixel affichable de la ligne vidéo paire 56, puis les signaux vidéo envoyés aux sous-pixels p(i,j + 2), p(i + 1 ,j + 2) et p(i +1 ,j+3) représentant respectivement les couleurs primaires V, B et R pour constituer le pixel suivant de ladite ligne vidéo paire 56.

In a third example of addressing, applied to a screen of the orthogonal type, illustrated by the figure 5 , for j periodically varying from 1 to M in steps of 3, and for two lines Li and Li + 1 data located on the odd field 11, we sample:

• the video signals sent to the sub-pixels p (i, j + 1), p (i + 1, j) and p (i + 1, j + 1) respectively representing the primary colors V, B and R to constitute the first display pixel of the odd video line 25 and 27, then the video signals sent to the sub-pixels p (i, j + 2), p (i, j + 3) and p (i + 1, j + 2) representing respectively the primary colors B, R and V to constitute the next pixel of said odd video line 25 and 27, and for two physical lines Li and Li + 1 data located on the even frame 42, the following samples are sampled:
  • the video signals sent to the sub-pixels p (i, j), p (i, j + 1) and p (i + 1, j + 1) respectively representing the primary colors B, R and V to constitute the first displayable pixel of the video line pair 56, then the video signals sent to the sub-pixels p (i, j + 2), p (i + 1, j + 2) and p (i +1, j + 3) respectively representing the colors primary V, B and R to constitute the next pixel of said even video line 56.

• les signaux vidéo envoyés aux sous-pixels p(i,j), p(i + 1, j) et p(i + 1 ,j + 1) représentant respectivement les couleurs primaires R, V et B pour constituer le premier pixel affichable de la ligne vidéo impaire 29, puis les signaux vidéo envoyés aux sous-pixels p(i,j + 1), p(i,j + 2) et p(i + 1,j + 2) représentant respectivement les couleurs primaires V, B et R pour constituer le deuxième pixel de ladite ligne vidéo impaire 29, puis les signaux vidéo envoyés aux sous-pixels p(i,j), p(i + 1,j) et p(i + 1,j + 1) représentant respectivement les couleurs primaires B, R et V pour constituer le premier pixel de la ligne vidéo impaire suivante 31, puis les signaux vidéo envoyés aux sous-pixels p(i,j + 1), p(i,j + 2) et p(i + 1 ,j + 2) représentant respectivement les couleurs primaires R, V et B pour constituer le deuxième pixel affichable de la ligne vidéo impaire 31, puis les signaux vidéo envoyés aux sous-pixels p(i,j), p(i + 1 ,j) et p(i + 1,j + 1) représentant respectivement les couleurs primaires V, B et R pour constituer le premier pixel de ladite ligne vidéo impaire 33, puis les signaux vidéo envoyés aux sous-pixels p(i,j + 1), p(1,j + 2) et p(i + 1 ,j + 2) représentant respectivement les couleurs primaires B, R et V pour constituer le deuxième pixel de ladite ligne vidéo impaire 33, et pour six lignes physiques Li et Li + 1, Li + 2, Li + 3, Li + 4, Li + 5 données situées sur la trame paire 44, on échantillonne :
  • les signaux vidéo envoyés aux sous-pixels p(i,j), p(i + 1 ,j) et p(i + 1, j + 1) représentant respectivement les couleurs primaires V, B et R pour constituer le premier pixel affichable de la ligne vidéo paire 58, puis les signaux vidéo envoyés aux sous-pixels p(i, j + 1), p(i, j + 2) et p(i + 1 ,j + 2) représentant respectivement les couleurs primaires B, R et V pour constituer le deuxième pixel de ladite ligne vidéo paire 58, puis les signaux vidéo envoyés aux sous-pixels p(i,j), p(i + 1,j) et p(i + 1,j + 1) représentant respectivement les couleurs primaires R, V et B pour constituer le premier pixel de la ligne vidéo paire suivante 60, puis les signaux vidéo envoyés aux sous-pixels p(i,j + 1), p(i,j + 2) et p(i + 1,j + 2) représentant respectivement les couleurs primaires V, B et R pour constituer le deuxième pixel affichable de la ligne vidéo paire 60, puis les signaux vidéo envoyés aux sous-pixels p(i,j), p(i + 1,j) et p(i + 1,j + 1) représentant respectivement les couleurs primaires B, R et V pour constituer le premier pixel de ladite ligne vidéo paire 62, puis les signaux vidéo envoyés aux sous-pixels p(i,j + 1), p(i,j + 2) et p(i + 1,j + 2) représentant respectivement les couleurs primaires R, V et B pour constituer le deuxième pixel de ladite ligne vidéo paire 62.

In a fifth example of addressing, applied to a screen of the orthogonal type, illustrated by the figure 6 , for j periodically varying from 1 to M in steps of 3, and for six physical lines Li and Li + 1, Li + 2, Li + 3, Li + 4. Li + 5 data located on the odd field 13, we sample :

• the video signals sent to the sub-pixels p (i, j), p (i + 1, j) and p (i + 1, j + 1) respectively representing the primary colors R, V and B to constitute the first displayable pixel of the odd video line 29, then the video signals sent to the sub-pixels p (i, j + 1), p (i, j + 2) and p (i + 1, j + 2) respectively representing the primary colors V , B and R to constitute the second pixel of said odd video line 29, then the video signals sent to the sub-pixels p (i, j), p (i + 1, j) and p (i + 1, j + 1 ) respectively representing the primary colors B, R and V to constitute the first pixel of the next odd video line 31, then the video signals sent to the sub-pixels p (i, j + 1), p (i, j + 2) and p (i + 1, j + 2) respectively representing the primary colors R, V and B to constitute the second displayable pixel of the odd video line 31, then the video signals sent to the sub-pixels p (i, j), p (i + 1, j) and p (i + 1, j + 1) respectively representing the primary colors V, B and R to constitute the first pixel of said odd video line 33, then the video signals sent to the sub-pixels p (i, j + 1), p (1, j + 2) ) and p (i + 1, j + 2) respectively representing the primary colors B, R and V to constitute the second pixel of said odd video line 33, and for six physical lines Li and Li + 1, Li + 2, Li + 3, Li + 4, Li + 5 data located on the even frame 44, we sample:
  • the video signals sent to the sub-pixels p (i, j), p (i + 1, j) and p (i + 1, j + 1) respectively representing the primary colors V, B and R to constitute the first displayable pixel of the video line pair 58, then the video signals sent to the sub-pixels p (i, j + 1), p (i, j + 2) and p (i + 1, j + 2) respectively representing the primary colors B , R and V to constitute the second pixel of said paired video line 58, then the video signals sent to the sub-pixels p (i, j), p (i + 1, j) and p (i + 1, j + 1 ) respectively representing the primary colors R, V and B to form the first pixel of the next pair of video lines 60, and then the video signals sent to the sub-pixels p (i, j + 1), p (i, j + 2) and p (i + 1, j + 2) respectively representing the primary colors V, B and R to constitute the second displayable pixel of the video line 60, then the video signals sent to the sub-pixels p (i, j), p (i + 1, j) and p (i + 1, j + 1) representing respectively t the primary colors B, R and V to constitute the first pixel of said paired video line 62, then the video signals sent to the sub-pixels p (i, j + 1), p (i, j + 2) and p ( i + 1, j + 2) respectively representing the primary colors R, V and B to constitute the second pixel of said paired video line 62.

• les signaux vidéo envoyés aux sous-pixels p(i,j), p(i,j + 1) et p(i + 1,j) représentant respectivement les couleurs primaires R, V et B pour constituer le premier pixel affichable la ligne vidéo impaire 35 et 37, puis les signaux vidéo envoyés aux sous-pixels p(i,j + 2), p(i+1,j+1) et p(i + 1,j + 2) représentant respectivement les couleurs primaires B, R et V pour constituer le pixel suivant de ladite ligne vidéo impaire 35 et 37, et pour deux lignes physiques Li et Li + 1 situées sur la trame paire 46, on échantillonne :
  • les signaux vidéo envoyés aux sous-pixels p(i,j), p(i + 1 ,j) et p(i + 1 ,j + 1) représentant respectivement les couleurs primaires B, R et V pour constituer le premier pixel affichable la ligne vidéo paire 64, puis les signaux vidéo envoyés aux sous-pixels p(i,j + 1), p(i,j + 2) et p(i + 1 ,j + 2) représentant respectivement les couleurs primaires R, V et B pour constituer le pixel suivant de ladite ligne vidéo paire 64.

In a sixth example of addressing, applied to a screen of the Delta type represented in FIG. figure 7a , in which the physical lines Li + 1 are shifted to the right by half a sub-pixel with respect to the physical lines Li, for j periodically varying from 1 to M in steps of 3, and for two lines physical Li and Li + 1 data located on the odd field 15, we sample:

• the video signals sent to the subpixels p (i, j), p (i, j + 1) and p (i + 1, j) respectively representing the primary colors R, V and B to constitute the first pixel that can be displayed on the line odd video 35 and 37, then the video signals sent to the sub-pixels p (i, j + 2), p (i + 1, j + 1) and p (i + 1, j + 2) respectively representing the primary colors B, R and V to constitute the next pixel of said odd video line 35 and 37, and for two physical lines Li and Li + 1 located on the even frame 46, we sample:
  • the video signals sent to the sub-pixels p (i, j), p (i + 1, j) and p (i + 1, j + 1) respectively representing the primary colors B, R and V to constitute the first displayable pixel the video line pair 64, then the video signals sent to the sub-pixels p (i, j + 1), p (i, j + 2) and p (i + 1, j + 2) respectively representing the primary colors R, V and B to constitute the next pixel of said video line pair 64.

• les signaux vidéo envoyés aux sous-pixels p(i,j), p(i,j + 1) et p(i + 1 ,j) représentant respectivement les couleurs primaires R, V et B pour constituer le premier pixel affichable la ligne vidéo impaire 39, puis les signaux vidéo envoyés aux sous-pixels p(i,j+2), p(i+1,j+1) et p(i+1,j+2) représentant respectivement les couleurs primaires B, R et V pour constituer le deuxième pixel affichable la ligne vidéo impaire 39, puis les signaux vidéo envoyés aux sous-pixels p(i,j + 1), p(i + 1,j) et p(i + 1,j + 1) représentant respectivement les couleurs primaires V, B et R pour constituer le premier pixel affichable la ligne vidéo impaire 41, puis les signaux vidéo envoyés aux sous-pixels p(i,j + 2), p(i,j + 3) et p(i + 1,j + 2) représentant respectivement les couleurs primaires B, R et V pour constituer le deuxième pixel affichable la ligne vidéo impaire 41, et pour deux lignes physiques Li et Li + 1 situées sur la trame vidéo paire 48, on échantillonne :
  • les signaux vidéo envoyés aux sous-pixels p(i,j), p(i + 1,j) et p(i + 1,j + 1) représentant respectivement les couleurs primaires B, R et V pour constituer le premier pixel affichable la ligne vidéo impaire 65, puis les signaux vidéo envoyés aux sous-pixels p(i,j + 1), p(i,j + 2) et p(i + i,j + 2) représentant respectivement les couleurs primaires R, V et B pour constituer le deuxième pixel affichable la ligne vidéo impaire 65, puis les signaux vidéo envoyés aux sous-pixels p(i,j), p(i,j + 1) et p(i + 1 , j + 1) représentant respectivement les couleurs primaires B, R et V pour constituer le premier pixel affichable la ligne vidéo impaire 66, puis les signaux vidéo envoyés aux sous-pixels p(i,j + 2), p(i + 1 ,j + 2) et p(i + 1 ,j + 3) représentant respectivement les couleurs primaires V, B et R pour constituer le deuxième pixel affichable de la ligne vidéo impaire 66.

In a seventh example of addressing, applied to a screen of the Delta type represented in FIG. figure 7b , for j periodically varying from 1 to M in steps of 3, for two physical lines Li and Li + 1 located on the odd video frame 17, we sample:

• the video signals sent to the subpixels p (i, j), p (i, j + 1) and p (i + 1, j) respectively representing the primary colors R, V and B to constitute the first pixel that can be displayed on the line odd video 39, then the video signals sent to the sub-pixels p (i, j + 2), p (i + 1, j + 1) and p (i + 1, j + 2) respectively representing the primary colors B, R and V to form the second displayable pixel odd video line 39, then the video signals sent to the sub-pixels p (i, j + 1), p (i + 1, j) and p (i + 1, j + 1) respectively representing the primary colors V, B and R to form the first displayable pixel odd video line 41, then the video signals sent to the sub-pixels p (i, j + 2), p (i, j + 3) and p (i + 1, j + 2) respectively representing the primary colors B, R and V to form the second displayable pixel odd video line 41, and for two physical lines Li and Li + 1 located on the video frame 48, is sampled:
  • the video signals sent to the sub-pixels p (i, j), p (i + 1, j) and p (i + 1, j + 1) respectively representing the primary colors B, R and V to constitute the first displayable pixel the odd video line 65, then the video signals sent to the sub-pixels p (i, j + 1), p (i, j + 2) and p (i + i, j + 2) respectively representing the primary colors R, V and B to constitute the second display pixel the odd video line 65, then the video signals sent to the sub-pixels p (i, j), p (i, j + 1) and p (i + 1, j + 1) respectively representing the primary colors B, R and V to constitute the first displayable pixel odd video line 66, then the video signals sent to sub-pixels p (i, j + 2), p (i + 1, j + 2) and p (i + 1, j + 3) respectively representing the primary colors V, B and R to constitute the second displayable pixel of the odd video line 66.

• les signaux vidéo envoyés aux sous-pixels p(i,j), p(i,j + 1) et p(i + 1,j) représentant respectivement les couleurs primaires R, V et B pour constituer le premier pixel affichable la ligne vidéo impaire 47, puis les signaux vidéo envoyés aux sous-pixels p(i + 1, j + 1), p(i + 1,j + 2) et p(i + 2,j + 2) représentant respectivement les couleurs primaires R, V et B pour constituer le deuxième pixel affichable commun à la ligne vidéo impaire 47, puis les signaux vidéo envoyés aux sous-pixels p(i + 2,j), p(i + 2,j + 1) et p(i + 3,j) représentant respectivement les couleurs primaires R, V et B pour constituer le premier pixel affichable la ligne vidéo impaire 49, puis les signaux vidéo envoyés aux sous-pixels p(i + 3, j + 1), p(i + 3,j + 2) et p(i + 4, j + 2) représentant respectivement les couleurs primaires R, V et B pour constituer le deuxième pixel affichable de la lignes vidéo impaire 49, et pour trois lignes physiques Li, Li + 1 et Li + 2 situées sur la trame vidéo paire 52, on échantillonne :
  • les signaux vidéo envoyés aux sous-pixels p(i,j), p(i + 1,j) et p(i + 1,j + 1) représentant respectivement les couleurs primaires B, R et V pour constituer le premier pixel affichable la ligne vidéo paire 68, puis les signaux vidéo envoyés aux sous-pixels p(i + 1, j + 2), p(i + 2, j + 1) et p(i + 2, j + 2) représentant respectivement les couleurs primaires B, R et V pour constituer le deuxième pixel affichable la ligne vidéo impaire 68.

In an eighth example of addressing, applied to a screen of the Delta type shown in FIG. figure 9 , for j periodically varying from 1 to M in steps of 3, for four physical lines Li, Li + 1, Li + 2 and Li + 3 located on the odd video frame 20, we sample:

• the video signals sent to the subpixels p (i, j), p (i, j + 1) and p (i + 1, j) respectively representing the primary colors R, V and B to constitute the first pixel that can be displayed on the line odd video 47, then the video signals sent to the sub-pixels p (i + 1, j + 1), p (i + 1, j + 2) and p (i + 2, j + 2) respectively representing the primary colors R, V and B to constitute the second displayable pixel common to the odd video line 47, then the video signals sent to the sub-pixels p (i + 2, j), p (i + 2, j + 1) and p ( i + 3, j) respectively representing the primary colors R, G and B to constitute the first displayable pixel odd video line 49, then the video signals sent to the sub-pixels p (i + 3, j + 1), p ( i + 3, j + 2) and p (i + 4, j + 2) respectively representing the primary colors R, V and B to constitute the second display pixel of the odd video lines 49, and for three physical lines Li, Li + 1 and Li + 2 located on the video frame 52, the following samples are taken:
  • the video signals sent to the sub-pixels p (i, j), p (i + 1, j) and p (i + 1, j + 1) respectively representing the primary colors B, R and V to constitute the first displayable pixel the video line pair 68, then the video signals sent to the sub-pixels p (i + 1, j + 2), p (i + 2, j + 1) and p (i + 2, j + 2) respectively representing the primary colors B, R and V to form the second displayable pixel odd video line 68.

Thanks to the device according to the invention, the resolution is improved, regardless of the type of screen addressed. In particular, for the screens of the Delta type, the resolution is equal to M * 2/3 and therefore twice the resolution obtained by the addressing modes of these screens by devices of the prior art and the vertical resolution is equal to at N / 2 for strictly vertical lines and at N for diagonal lines.

Claims (6)

1. Device for addressing a matrix screen suitable for displaying images having a plurality of video rows and columns whose constituent pixels are obtained by combining a plurality of subpixels corresponding to primary colors (R, G and B), each receiving a luminance video signal and distributed in a network of N physical rows and M physical columns, the device including between a demultiplexing stage (220)and a multiplexing stage (230) at least a memory stage (70, 198), characterized in that the memory stage (70, 198) is adapted to receive, via a demultiplexing stage (220), and to store a plurality of sequences of digital data, each representing a previously digitised luminance video signal and to deliver the said luminance video signals to a multiplexing stage (230), this one being designed to select a sequence of digital data corresponding to a given combination of subpixels of the image to display, using according to the said data combination, the digital data previously stored in the said memory stage (70, 198).
2. Device according to Claim 1, wherein the memory stage (198) includes two parallel branches, that is to say a first branch in which is arranged a first unit (200) having at least three FIFO cells, that is to say a first cell (202), a second cell (204) and a third cell (206) intended respectively to contain the video data relating to the subpixels corresponding to primary colors (R, G and B) situated on one of the physical rows constituting an even video row, and a second branch in which is arranged a second unit (210) also having at least three FIFO cells, that is to say a fourth cell (212), a fifth cell (214) and a sixth cell (216) intended respectively to contain the video data relating to the subpixels corresponding to primary colors (R, G and B) situated on one of the physical rows constituting an odd video row.
3. Device according to Claim 1, also comprising means (72) of controlling the writing of the digital data to the memories (80, 82, 84) of the memory stage and means (74) of controlling the reading of the said data from said memories (80, 82, 83), said write control means (72) and read control means (74) are connected to a first means (76) of synchronizing the writing and reading phases.
4. Device according to Claim 3, wherein each of said memories (80, 82 and 84) includes two distinct areas, that is to say a first area (102) in which there are written the digital data relating to the subpixels corresponding to the primary colors (R, G and B) of a given video row during a given writing phase, and a second area (104) from which there are read, during the said writing phase, the digital data relating to the subpixels corresponding to the primary colors (R, G and B) of a video row written during the previous writing phase.
5. Device according to Claim 2, wherein the demultiplexing stage (220) is adapted to switch on the one hand the data relating to the subpixels corresponding to the primary colors (R, G and B) belonging to the odd video columns to the first unit (200) so as to write the said data, during a phase of writing a video row of duration D, respectively to the first cell (202), the second cell (204) and the third cell (206), and on the other hand the data relating to the subpixels corresponding to the primary colors (R, G and B) belonging to the even video columns to the second unit (210), so as to write the said data, during the writing phase, respectively to the fourth cell (212), the fifth cell (214) and the sixth cell (216).
6. Device according to Claim 2 or to claim 5, also including a synchronization means (240) connected on the one hand to the demultiplexing stage (220) and delivering to this stage (220) a first periodic signal OW of frequency F controlling the writing of the video data relating to the subpixels corresponding to the primary colors (R, G and B) situated on an odd video column respectively to the first cell (202), the second cell (204) and the third cell (206), and a second periodic signal EW of frequency F controlling the writing of the video data relating to the subpixels corresponding to the primary colors (R, G and B) situated on an even video column respectively to the fourth cell (212), the fifth cell (214) and the sixth cell (216), this synchronization means (240) is connected moreover to the multiplexing stage (230), and delivering to this stage (230) a third periodic signal RD of frequency 2*F controlling the reading of the video data relating to the subpixels of an even (or respectively odd) video row selected by the multiplexing stage (230).

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