EP0911858A1 - Elimination de l'effet de moiré d'un écran plat de visualisation - Google Patents
Elimination de l'effet de moiré d'un écran plat de visualisation Download PDFInfo
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- EP0911858A1 EP0911858A1 EP98410123A EP98410123A EP0911858A1 EP 0911858 A1 EP0911858 A1 EP 0911858A1 EP 98410123 A EP98410123 A EP 98410123A EP 98410123 A EP98410123 A EP 98410123A EP 0911858 A1 EP0911858 A1 EP 0911858A1
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- European Patent Office
- Prior art keywords
- cathode
- network
- grid
- anode
- organized
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J31/00—Cathode ray tubes; Electron beam tubes
- H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
- H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
- H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
- H01J31/123—Flat display tubes
- H01J31/125—Flat display tubes provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digital selection
- H01J31/127—Flat display tubes provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digital selection using large area or array sources, i.e. essentially a source for each pixel group
Definitions
- the present invention relates to the field of screens viewing dishes. It applies more particularly to flat screens of the type comprising a microtip cathode of electronic bombardment of an anode carrying phosphor elements.
- Figure 1 shows the functional structure of a classic microtip flat screen in which the surface of the screen consists of a glass plate carrying the anode cathodoluminescent.
- Such a microtip screen essentially consists a cathode 1 with microtips 2 and a grid 3 provided with holes 4 corresponding to the locations of the microtips 2.
- the cathode 1 is placed opposite a cathodoluminescent anode 5 including a glass substrate 6 constitutes the screen surface.
- Cathode 1 is organized in columns and is made up, on a substrate 10, for example made of glass, of conductors cathode organized in meshes from a conductive layer.
- the microtips 2 are produced on a resistive layer 11 deposited on the cathode conductors and are arranged inside meshes defined by these cathode conductors.
- the Figure 1 partially showing the interior of a mesh, the cathode conductors do not appear in this figure.
- the cathode 1 is associated with grid 3 which is organized in rows, an insulating layer (not shown) being interposed between the cathode conductors and the grid 3. The intersection a row of grids 3 and a cathode column 1 defines a pixel.
- This device uses the electric field created between the cathode 1 and grid 3 so that electrons are extracted from microtips 2 to phosphor elements 7 of the anode 5 crossing an empty space 12.
- the anode 5 is provided with alternating bands phosphor elements 7, each corresponding to a color (blue, red, green). The bands are separated from each other by an insulator 8.
- the phosphor elements 7 are deposited on electrodes, consisting of corresponding bands 9 of a transparent conductive layer such as indium oxide and tin (ITO).
- Blue, red, green stripe sets are alternately polarized with respect to cathode 1 for that the electrons extracted from the microtips 2 of a pixel of the cathode / grid is alternately directed towards the elements phosphors 7 opposite each of the colors.
- the elements luminophores can also be organized into individualized tablets by pixels and polarized by sets of pads of same color by means of the bands 9, so that the elements phosphors are still broadly organized in bands.
- the anode consists of a plane of elements phosphors or two sets of alternating bands of elements phosphors of the same color.
- the invention relates more particularly to screens in which the anode consists of several sets of strips of phosphor elements, or pellets of phosphor elements. Reference is made below to color screens. However, the invention also applies to monochrome screens whose phosphor elements are organized in bands and at screens whose anode consists of a plane of phosphor elements of the same color.
- a screen intended to be looked at from the anode which will be designated subsequently "to anode transparent ", or associated with a filter, anode side, for example an electromagnetic radiation filter or a filter restricting the viewing angle.
- a filter is generally consisting of a network of elongated and parallel opaque patterns, or two perpendicular networks of elongated opaque patterns and parallel.
- the addition of such a filter to a flat anode screen transparent introduces a phenomenon called "moiré" which harms the display quality.
- the moire effect corresponds to a distortion (variation of luminance and chrominance) of the image in depending on the screen region or the viewing angle.
- the moiré phenomenon is due the presence, between the light emitting surface (the anode) in network and the viewing area (the filter area), one or more opaque networks whose directions are not perpendicular to the anode strips.
- a moiré phenomenon can be observed as soon as an opaque network having a non-perpendicular direction to the direction of the light emitting elements is between the emissive network and the display surface, for example, if the opaque network has a parallel direction to the direction of the light emitting elements but presents a no different. So even if the filter includes only one network parallel to the anode bands, a phenomenon of moiré appears if the pitch is different, which is common in practice, in particular, for a color screen where the width of a pixel corresponds generally three parallel strips of the anode while the step of the opaque patterns of the filter is independent of the screen.
- FIG. 2 schematically illustrates an example screen with microtips called “transparent cathode", that is to say intended to be watched from the cathode.
- the cathode 1 is produced on a substrate 10, here a transparent glass substrate, of conductors 13 organized in columns.
- a resistive layer 11 is added on the conductors 13 and the microtips 2 are deposited on this resistive layer.
- the conductors 13 are, most often, mesh and, alternatively, these conductors are deposited on the resistive layer 11, a group of microtips 2 being deposited at the center of each mesh (not shown) defined by a conductor 13.
- FIGS. 1 and 2 For reasons of clarity, only a few microtips have been represented in FIGS. 1 and 2. It will however be noted that there are several thousand microtips per pixel screen.
- Grid 3 consisting of an organized conductive layer in rows perpendicular to the cathode columns, is deposited on an insulating layer 14 attached to the cathode 1, the grid 3 being provided with holes 4 at the locations of the microtips.
- the anode 5 is formed on a substrate 6, for example in glass, and consists of phosphor elements 7 deposited on a conductive polarization layer 9 organized in strips parallel to columns 13. Being a screen visible from the cathode, a reflective layer (not shown) is interposed between the phosphor elements 7 and the layer 9 or between substrate 6 and layer 9, to return the light to the cathode. If necessary, this reflection function is provided by the conductive layer 9 itself.
- a problem which arises in a screen with a transparent cathode is that the conductive tracks of the grid 3 and of the cathode 1 are capable of creating obstacles to the passage of light l to the eye O of the user, even placed in front of the observed region.
- the document FR-A-2 682 211 describes a solution which consists in organizing the anode in the form of parallel strips of phosphor elements parallel to the grid rows, and to make sure that the cathode is devoid of microtips plumb with the strips phosphor elements, the conductive grid layer being also open directly above these bands.
- the drivers of cathode are not meshed but are here made in a layer transparent conductive, and only this conductive layer is present on the path of the light below the bands phosphor elements of the anode.
- Another solution to improve the transparency of the cathode consists in etching the resistive layer, the grid and the cathode conductors to have maximum opening directly above the strips of phosphor elements to minimize the opaque surface on the cathode side. If such a solution improves the brightness of the screen, it does not remove the appearance of the moiré phenomenon due to opaque networks perpendiculars maintained in the cathode / grid structure, involving a parallel network with the bands of phosphor elements.
- US Patent 5,578,225 provides, to resolve this problem, a cathode and a grid completely transparent to with the exception of microtips.
- the removal of any opaque network effectively suppresses the appearance of the phenomenon moiré to the extent that any variation in transparency is eliminated local.
- this solution is, in practice, unsuitable. Indeed, such a solution does not make it possible to provide a resistive layer for homogenization of electronic emission.
- the ITO commonly used as a conductive material transparent is not sufficiently resistive for the realization of such a layer.
- ITO has a square resistance of around 20 ohms, while the resistive layer of a screen classic is usually formed from a material having a square resistance of the order of 1 M ⁇ . The use of ITO for resistive layer would significantly increase the distance access to the tips by this resistive layer.
- the problems related to the moiré phenomenon that have been described above in relation to the grids of the grid and the cathode can also, in a screen with a transparent cathode, come from filters as in a screen visible from the anode, or additional grids constituting a screen with double or triple grid.
- the present invention aims to overcome the drawbacks of the classic screens above.
- An object of the present invention is to provide a new solution to avoid the appearance of a phenomenon of moiré in a screen whose anode is globally organized in strips, whether for a screen whose display surface is constituted by the anode and which is equipped with a filter, or for a transparent cathode screen.
- Another object of the present invention is to provide a transparent cathode screen which eliminates the risk of occurrence of the moiré phenomenon without harming the homogenization of electronic emission of microdots from the cathode.
- the invention aims, in particular, to preserve the use of a layer resistive cathode side.
- the present invention originates from a new approach of the inventors to solve the moiré problem. According to this approach, we don't try to avoid local variations transparency within the same pixel as in documents US-A-5,578,225 and FR-A-2,682,211, but to ensure that these local variations in transparency are not noticeable by the observer, whatever his angle of observation.
- the approach proposed by the present invention consists to make sure that the transparency of an elementary pattern of a opaque network, generally aligned with a light emission network and crossed by the light rays, either, in the direction of this alignment, regular over the entire pattern.
- motif elementary denotes a pattern of a size corresponding to the threshold of visual perception of the observer.
- the elementary pattern will therefore be consisting of a pixel. However, it may also be of a group of a few pixels.
- the present invention provides a flat display screen including an emission source light organized into a first network of bands overall parallels in a first direction, and at least a second opaque network, inserted between the light emission source and a viewing area, and organized in a second direction generally non-perpendicular to the first, at least one of said networks having, along an axis parallel to the overall direction of the first network and whatever the position of this axis in a perpendicular direction, a proportion transparent surface constant for an elementary pattern.
- the flat screen includes a cathodoluminescent anode organized in strips of phosphor elements, and a microtip cathode electronic emission, generally organized in parallel columns and associated with a grid organized globally in rows perpendicular to the cathode columns, the cathode or the grid constituting said second opaque network.
- the grid or respectively the cathode, constitutes a third opaque network, of generally parallel lines, organized in a direction perpendicular to the direction of the second network.
- each cathode line, or grid respectively, constituting of the second network includes a succession of portions active straight and staggered, connected by sections obliques.
- each line of the third network includes a straight section in its overall direction, connecting active portions specific to cooperate with the active portions of the second network.
- the grid rows are generally parallel to the strips anode.
- cathode columns are generally parallel to the strips anode.
- each cathode column is provided with active plumb portions every other row of grids.
- the first light emission network comprises bands in zigzag, the dimensions of a corresponding elementary pattern, at less in a first direction, to a higher integer multiple or equal to 1 of the distance between the ends of the rafters defined by the bands of the first network.
- the anode consists of at least two sets of alternating strips, and the convex ends, respectively concave, of rafters formed by the bands of a set are aligned, in the overall direction of the bands, with the concave ends, respectively convex, chevrons of a neighboring band belonging to the same set.
- FIG. 3 represents a first embodiment of a transparent cathode according to the present invention. This embodiment is intended for a flat screen in which the strips of phosphor elements of the anode (symbolized by columns A i , A i + 1 ) are parallel to the general direction of the cathode conductors.
- FIG. 3 is a partial top view of the cathode 1 associated with the grid 3.
- Cathode 1 is generally organized in columns and consists of conductors 13 on a glass substrate, the microtips (not shown) are made on a layer resistive whose pattern is identical to that of the columns of cathode.
- the conductors 13 are organized in meshes from a conductive layer and the microtips are arranged inside the meshes defined by these conductors cathode.
- the mesh of the conductors of cathode has not been shown for clarity and we will designate thereafter, by conductor 13, all of the meshes defining a column.
- Cathode 1 is associated with grid 3 which is itself globally organized in conductive rows 17 perpendicular to the cathode columns.
- An insulating layer (not shown) is conventionally interposed between the conductors of cathode and grid rows.
- the conductive layer, in which rows 17 are defined, and the insulating layer comprises holes 4 plumb with each microtip of the cathode.
- the conductive materials used to form the cathode conductors 13 and the rows 17 of the grid are opaque materials.
- we use, to make the resistive layer for example, the same material opaque than that used in a screen with transparent anode (figure 1).
- the pattern of the conductors 13 is not straight, while remaining generally parallel to the bands A i and A i + 1 of the anode.
- each cathode conductor has rectilinear active portions 20, 21, staggered in the general direction of the column. Portions 20, 21 are connected to each other by sections 22 of direction oblique which are, for example and according to this embodiment, contained in the width of straight sections 23 constituting rows 17.
- Each row 17 comprises a straight section 23 perpendicular to the overall direction of the conductors 13 of cathode and comprises, on either side of its section 23, active portions 24 perpendicular, of a corresponding size substantially half of a portion 20, 21 of a conductor cathode 13.
- a given row therefore comprises two portions 24 in staggered directly above each cathode conductor it cross.
- the microtips are formed at the level portions 20 and 21.
- a pixel 25 comprises half of a portion 20 and half a portion 21 of cathode conductor, offset one by relative to each other in the overall alignment of the driver 13. These two half-portions are associated with the same row 17 of grid. Thus, in Figure 3, four pixels 25 are shown.
- the opaque zones are constituted either by the presence of a section 23 of a row of grids, either by the presence of a portion 20, 21 of a cathode conductor.
- An elementary pattern within the meaning of the present invention here consists of a pixel 25.
- the transparency of a pixel is constant from one end of the pixel to the other in the direction of the rows 17, that is to say that each pixel comprises, along an axis parallel to the overall alignment of the cathode conductors 13, the same proportion of opaque surface and transparent surface, whatever the position of this axis in the perpendicular direction (i.e. in the direction of rows 17).
- each pixel includes opaque rectilinear and non-perpendicular surfaces to the anode bands, these are at a scale imperceptible to the observer.
- each strip A i , A i + 1 of the anode may consist of three parallel strips of phosphor elements of different colors in the case of a color screen, or of two parallel strips spaced apart from phosphor elements of same color in the case of a monochrome screen.
- a pixel 25 as represented in FIG. 3 in fact corresponds to a sub-pixel of a given color, a screen pixel then being defined by three sub-pixels each corresponding to a color (red, green Blue).
- FIG. 4 shows a second embodiment of a transparent cathode according to the present invention.
- the columns 13 of conductors of cathode are generally parallel to the strips of elements anode phosphors.
- each column 13 of cathode comprises a succession of active portions 20, 21 rectilinear and staggered, connected by oblique sections 22.
- the grid is organized in rows 17 and each row has a straight section 23, perpendicular to the strips anode, to connect active portions 24 directly above the portions 20, 21 of the cathode.
- each row 17 of the grid is associated with portions 20 (or 21) straight and whole cathode conductors 13.
- a row 17 data includes active portions 24 directly above the portions 20 (or 21) of the conductors 13 that it crosses, the portions 24 of the same row 17 therefore being aligned two by two perpendicularly in section 23.
- the connecting sections 22 of cathode conductors 13 are not plumb with the straight sections 23 of the rows 17 grid.
- a pixel 25 ' defined by the intersection of a row 17 of the grid with a cathode conductor 13 comprises two portions 20 (or 21) aligned.
- an elementary pattern of the invention is constituted by two successive pixels 25 'of a same cathode conductor 13.
- the ratio between transparent surface and opaque surface along a axis parallel to the overall direction of the cathode conductors is constant whatever the position of this axis in the direction of grid rows 17.
- the smallest pattern respecting the regularity of the report transparency according to the invention is the pixel, but that this regularity is respected for reasons of a size of multiple pixels and regardless of this size.
- the smallest reason respecting the regularity of the transparency report according to the invention is a group of two pixels in the direction of cathode columns, but this regularity is respected for any zone comprising a multiple of this elementary pattern.
- Figures 5 and 6 show, respectively, a third and a fourth embodiment of a transparent cathode according to the present invention.
- rows 17 ′ of grid 3 which have an overall direction parallel to the strips A i , A i + 1 of the anode.
- the pattern in succession of rectilinear active portions 20 ′, 21 ′, in staggered rows is applied to the rows 17 ′ of grid and the pattern comprising rectilinear connecting sections 23 ′ and active perpendicular portions 24 ′ is applied to the conductors 13 'of cathode.
- FIG. 5 represents an embodiment in which, as in FIG. 3, an elementary pattern consists of a pixel 25 of the screen.
- FIG. 6 represents an embodiment in which, as in FIG. 4, an elementary pattern consists of two successive pixels 25 ′ in alignment with the bands A i , A i + 1 of the anode.
- any of the embodiments illustrated by figures 3 to 6 it is also possible to organize the network (grid or cathode) perpendicular to anode strips with a pattern devoid of a straight section of link, that is to say with a pattern substantially taking up the same general appearance as the other network (cathode or grid) parallel to the anode strips.
- FIG. 7 represents an embodiment of a anode 5 according to the present invention. This embodiment is more particularly intended for a screen with transparent anode to avoid overlapping patterns aligned with a filter reported on the anode.
- the cathode / grid is produced in a conventional manner, that is to say that it includes two perpendicular networks defining respectively cathode columns and grid rows (figure 1).
- the strips of phosphor elements 7r, 7g, 7b are organized in a zigzag while being globally in a direction parallel to the grid rows (not shown) or to the cathode columns (not shown).
- the shape in zigzags given to bands 7r, 7g and 7b is such that a pixel 30 of the screen, defined by the intersection of a cathode column with a row of grids, preferably includes the same proportion surface area of phosphor elements of each color.
- the rectilinear portions 31 of the strips 7r, 7g, 7b which are neighbors in the perpendicular direction (horizontal in figure 7) to the direction of the overall alignment (vertical to the Figure 7) bands, are parallel to each other.
- Each band 7r, 7g, 7b define successive and alternating chevrons 32 in the vertical direction (overall direction of the bands), each formed of two joined portions 31, the same portion 31 belonging to two 32 adjoining rafters.
- An elementary pattern (pixel), defined by the cathode / grid, is plumb with a rectangular surface 30 of which a first dimension is an integer multiple greater than or equal to 1 of the difference h between the ends 33, 34 of two successive chevrons in the vertical direction, or the difference e between the ends 33 (or 34) of the rafters two stripes of the same color in the horizontal direction.
- the second dimension of the rectangular surface is preferably such that the proportion between the colors is respected.
- the inclination of the rectilinear portions 31 relative to the direction of alignment overall bands, and the width and pitch of these portions are such that the ends, for example convex (external) 33, chevrons 32 of one color are aligned vertically (direction overall of the bands) with the ends, for example concave (internal) 34, rafters of the next or previous strip of the same color.
- An advantage of such an embodiment is that the second dimension of the elementary pattern can then be of any given value, regardless of direction (vertical or horizontal) of the first dimension respecting the condition described above, the proportion of colors being always respected.
- this filter can be formed, either of a network of lines parallel to the global direction of anode strips, or two networks perpendicular to each other creating lines parallel and perpendicular to the alignment overall anode bands. In both cases, no straight portion band of phosphor elements is not parallel to one direction of the filter.
- the shape given to the anode strips leads to that, whatever or the position of an axis parallel to the global alignment of anode strips, perpendicular to this overall direction, the proportion of phosphor elements along this axis is constant.
- FIG. 7 applies also in the case of a transparent cathode. Indeed, with such an anode form it is possible to use a conventional transparent cathode (FIG. 2) in which the cathode columns and the grid rows constitute two perpendicular networks of opaque lines.
- An advantage of the present invention is that it guarantees regular transparency of each elementary pattern (pixel or group of pixels) across the entire screen area.
- Another advantage of the present invention is that, at the within an elementary pattern, this transparency is regular from one end to the other of the elementary pattern in one direction perpendicular to the overall alignment of the emission source bright. Thus, we suppress any appearance of phenomenon of moire.
- Another advantage of the present invention is that it allows to keep an opaque structure for the realization of grid rows and, in particular, cathode columns.
- the present invention makes it possible to associate the conductors of cathode with a resistive layer for homogenization of the emission electronic by microtips.
- FIG. 8 illustrates a fifth embodiment of a transparent cathode according to the present invention.
- This embodiment is more particularly intended for a screen in which the scanning of the grid rows is carried out by group of two adjacent rows. Such a display mode is generally called "double scanning".
- the cathode columns are subdivided into two parallel sub-columns 13 i , 13 p . It can be considered that, for each column, a first sub-column 13 i addresses odd order pixels controlled by rows 17 i of odd order and a second sub-column 13 p addresses even order pixels controlled by a row 17 p of even order.
- the cathode columns have an overall direction parallel to the overall direction of the anode strips (not shown).
- the bands of phosphor elements are preferably straight.
- rows 17 i and 17 p of the grid are close to that given to rows 17 of FIG. 3.
- the groups of two active portions 24 on either side of the rectilinear section 23 are spaced from one another. in the direction of the sections 23 with a sufficient distance to allow the passage of a connecting section 35 of a conductor 13 i , 13 p of cathode associated with the row of grid of opposite row.
- Each cathode sub-column 13 i , 13 p successively comprises groups of two portions 20, 21 active and rectilinear in the direction of the column which are, as in the embodiment of FIG. 3, staggered one by compared to each other.
- the portions 20 and 21 of the same group comprise microtips and are connected to each other by an oblique section 22.
- Each group of two portions 20, 21 staggered by a sub-column 13 i , 13 p is connected to the group of portions 20, 21 along a section 35 consisting of two rectilinear parts also in staggered rows, but devoid of microtips.
- a pixel 25 of the screen contains a group of two portions 20 and 21 associated.
- An elementary pattern corresponds, in this mode of realization, at a pixel 25 of the screen. Note that a pixel can match more than two sub-columns.
- the display is performed by simultaneously addressing two neighboring grid rows and by applying, to each cathode sub-column, a fixing potential the brightness setpoint of the pixel defined by the intersection of the active portions of this sub-column with the grid row corresponding.
- a display mode is generally chosen when you want to extend the duration of lighting of each pixel. Indeed, this duration can, here, be double compared to a classic screen.
- the present invention is capable of various variants and modifications which will appear to the man of art.
- the non-rectilinear shapes given to cathode columns or grid rows, or strips anode may be modified provided they comply, for an elementary pattern, the same ratio between opaque surface and transparent surface in the overall direction of this electrode.
- the embodiments exposed in relation with a color screen transpose to a monochrome screen whose the anode consists of a plane of phosphor elements (except of the embodiment illustrated in FIG. 7), or of two alternating sets of bands of phosphors of the same color.
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Abstract
Description
Claims (10)
- Écran plat de visualisation comprenant :une source d'émission lumineuse (5) organisée en un premier réseau de bandes globalement parallèles (7) dans une première direction ; etau moins un deuxième réseau opaque (1, 3), intercalé entre la source d'émission lumineuse et une surface de visualisation (6, 10), et organisé dans une deuxième direction globalement non-perpendiculaire à la première,
- Écran plat selon la revendication 1, comprenant une anode cathodoluminescente (5) organisée en bandes (7, 7r, 7g, 7b) d'éléments luminophores, et une cathode (1) à micropointes (2) d'émission électronique, organisée globalement en colonnes parallèles (13, 13i, 13p) et associée à une grille (3) organisée globalement en rangées (17, 17i, 17p) perpendiculaires aux colonnes de cathode, caractérisé en ce que la cathode ou la grille constitue ledit deuxième réseau opaque.
- Écran plat selon la revendication 2, caractérisé en ce que la grille (3), ou respectivement la cathode (1), constitue un troisième réseau opaque, de lignes (17, 17i, 17p ; 13') globalement parallèles, organisé dans une direction perpendiculaire à la direction du deuxième réseau (1 ; 3).
- Écran plat selon la revendication 3, caractérisé en ce que chaque ligne (13, 13i, 13p ; 17') de cathode, ou respectivement de grille, constitutive du deuxième réseau comprend une succession de portions actives (20, 21 ; 20', 21') rectilignes et en quinconce, reliées par des tronçons (22 ; 22') obliques.
- Écran plat selon la revendication 4, caractérisé en ce que chaque ligne (17, 17i, 17p ; 13') du troisième réseau (3 ; 1) comprend un tronçon rectiligne (23 ; 23') dans sa direction globale, reliant des portions actives (24 ; 24') propres à coopérer avec les portions actives (20, 21 ; 20', 21') du deuxième réseau (1 ; 3).
- Écran plat selon la revendication 5, caractérisé en ce que les rangées (17') de grille sont globalement parallèles aux bandes d'anode.
- Écran plat selon la revendication 5, caractérisé en ce que les colonnes (13 ; 13i, 13p) de cathode sont globalement parallèles aux bandes d'anode.
- Écran plat selon la revendication 7, caractérisé en ce que chaque colonne de cathode (13i, 13p) est pourvue de portions actives (20, 21) à l'aplomb d'une rangée de grille (17i, 17p) sur deux.
- Écran plat selon la revendication 1, caractérisé en ce que le premier réseau d'émission lumineuse comprend des bandes en zigzag (7r, 7g, 7b), les dimensions d'un motif élémentaire (30) correspondant, au moins dans une première direction, à un multiple entier supérieur ou égal à 1 de la distance (e, h) séparant des extrémités (33, 34) de chevrons (32) définis par les bandes du premier réseau.
- Écran plat selon la revendication 9, dans lequel l'anode est constituée d'au moins deux ensembles de bandes alternées, caractérisé en ce que les extrémités convexes (33), respectivement concaves (34), des chevrons (32) formés par les bandes d'un ensemble sont alignées, dans la direction globale des bandes, avec les extrémités concaves (34), respectivement convexes (33), des chevrons d'une bande voisine appartenant au même ensemble.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FR9713592 | 1997-10-24 | ||
FR9713592A FR2770338B1 (fr) | 1997-10-24 | 1997-10-24 | Elimination de l'effet de moire d'un ecran plat de visualisation |
Publications (1)
Publication Number | Publication Date |
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EP0911858A1 true EP0911858A1 (fr) | 1999-04-28 |
Family
ID=9512804
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP98410123A Withdrawn EP0911858A1 (fr) | 1997-10-24 | 1998-10-23 | Elimination de l'effet de moiré d'un écran plat de visualisation |
Country Status (4)
Country | Link |
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US (1) | US6288694B1 (fr) |
EP (1) | EP0911858A1 (fr) |
JP (1) | JPH11219149A (fr) |
FR (1) | FR2770338B1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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FR2800512B1 (fr) * | 1999-10-28 | 2002-03-01 | Pixtech Sa | Ecran plat de visualisation a grille de protection |
US7006056B1 (en) * | 2000-01-06 | 2006-02-28 | International Business Machines Corporation | Three-dimensional display apparatus |
JP2004227978A (ja) * | 2003-01-24 | 2004-08-12 | Pioneer Electronic Corp | 立体画像表示装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996006450A1 (fr) * | 1994-08-24 | 1996-02-29 | Pixtech S.A. | Ecran plat de visualisation a haute tension inter-electrodes |
US5578225A (en) * | 1995-01-19 | 1996-11-26 | Industrial Technology Research Institute | Inversion-type FED method |
US5633650A (en) * | 1991-10-03 | 1997-05-27 | Futaba Denshi Kogyo K.K. | Flat-type fluorescent display device |
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1997
- 1997-10-24 FR FR9713592A patent/FR2770338B1/fr not_active Expired - Fee Related
-
1998
- 1998-10-23 EP EP98410123A patent/EP0911858A1/fr not_active Withdrawn
- 1998-10-23 JP JP10319900A patent/JPH11219149A/ja not_active Withdrawn
- 1998-10-23 US US09/178,141 patent/US6288694B1/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5633650A (en) * | 1991-10-03 | 1997-05-27 | Futaba Denshi Kogyo K.K. | Flat-type fluorescent display device |
WO1996006450A1 (fr) * | 1994-08-24 | 1996-02-29 | Pixtech S.A. | Ecran plat de visualisation a haute tension inter-electrodes |
US5578225A (en) * | 1995-01-19 | 1996-11-26 | Industrial Technology Research Institute | Inversion-type FED method |
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Publication number | Publication date |
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US6288694B1 (en) | 2001-09-11 |
FR2770338B1 (fr) | 2000-01-14 |
JPH11219149A (ja) | 1999-08-10 |
FR2770338A1 (fr) | 1999-04-30 |
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