EP0392918B1 - Elektrolumineszenzanzeigebildschirm mit Speicher und mit besonderer Elektrodenkonfiguration - Google Patents

Elektrolumineszenzanzeigebildschirm mit Speicher und mit besonderer Elektrodenkonfiguration Download PDF

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Publication number
EP0392918B1
EP0392918B1 EP90400980A EP90400980A EP0392918B1 EP 0392918 B1 EP0392918 B1 EP 0392918B1 EP 90400980 A EP90400980 A EP 90400980A EP 90400980 A EP90400980 A EP 90400980A EP 0392918 B1 EP0392918 B1 EP 0392918B1
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Prior art keywords
electrodes
sub
electrode
blocks
nonconductor
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French (fr)
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EP0392918A1 (de
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Pascal Thioulouse
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Orange SA
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France Telecom SA
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    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
    • G09G2360/147—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen the originated light output being determined for each pixel
    • G09G2360/148—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen the originated light output being determined for each pixel the light being detected by light detection means within each pixel

Definitions

  • the subject of the present invention is an electroluminescent display screen with memory effect of the flat screen type which can be used in the field of optoelectronics for displaying complex images or for displaying alphanumeric characters.
  • a display screen is said to have a memory effect if its electro-optical characteristic (luminance-voltage curve) has hysteresis.
  • the device can thus have two stable states: off or on.
  • a memory effect display to display a still image, it suffices to apply simultaneously and continuously to the entire screen a so-called maintenance voltage.
  • the latter can be a sinusoidal signal or in the form of slots for example, but above all, the form and frequency of this maintenance signal can be chosen independently of the complexity of the screen, in particular the number of lines of dots. display. There is therefore in principle no limit to the complexity of a memory effect display screen.
  • bistable plasma screens with alternating excitation of 1200x1200 image points (pixels).
  • ACTFEL thin-film electroluminescence display with capacitive coupling
  • PC-El memory effect a memory effect of extrinsic type which is called PC-El memory effect, the principle of which is as follows.
  • the photoconductive material When the device is in the off state, the photoconductive material is not very conductive and retains a significant part of the voltage V applied to the assembly. If one increases V to a value Von such that the voltage present at the terminals of the electroluminescent structure exceeds the electroluminescence threshold, the PC-El device switches to the on state. The photoconductive material is then illuminated by the electroluminescent structure and goes into the conductive state. The voltage across its terminals drops and this results in an increase in the voltage available for the electroluminescent structure. To switch off a PC-El device, it suffices to decrease the total voltage V to a value Voff lower than Von: this gives a luminance-voltage characteristic comprising a hysteresis.
  • This structure is shown diagrammatically in section in FIG. 1. It comprises a glass substrate 10 on which are deposited a transparent electrode 12, a first dielectric layer 14, an electroluminescent layer El 16, a second dielectric layer 18, a photoconductive layer PC 20 and finally a reflective electrode 22.
  • the layers PC and El are layers thin, whose thickness is of the order of a micrometer.
  • the electrodes 12 and 22 are connected to an alternating voltage source 24.
  • electrodes 12 are used, as shown in FIG. 2, in top view, made up of strips or groups of conductive strips parallel to each other and electrodes 24 also made up of strips or groups of parallel conductive strips between them, the electrodes 12 being perpendicular to the electrodes 24.
  • the electrodes 12 and 24 indifferently play the role of row electrodes or column electrodes and are connected to control circuits 23 and 25.
  • Such a structure is simple to produce because it does not require additional etching steps. Furthermore, the current-voltage behavior of the thin layer photoconductor in the dark is highly non-linear and reproducible. The beneficial consequences are that the electrical ignition of the device is always easy, that the hysteresis depends only slightly on the excitation frequency and that the reproducibility of the hysteresis margin from one manufacturing to another is guaranteed. .
  • the present invention essentially applies to this new structure.
  • the conductivity of the intrinsic photoconductive material PC can be reduced from 10 ⁇ 6 to 10 ⁇ 13 ( ⁇ .cm) ⁇ 1.
  • the intrinsic photoconductive layer, denoted i, then becomes as resistive as the other layers of the PC-El structure.
  • the photoconductive layer PC is generally composed of a stack of n+-i-n+ layers.
  • the two layers n+ also based on hydrogenated amorphous silicon, are obtained by doping with phosphorus (addition of phosphine during the deposition) and have the role of allowing a quasi-ohmic electronic injection in the intrinsic layer.
  • layers n+ are substantially more conductive than the intrinsic layers i and the incorporation of carbon into the material of layers n+ (a-Si 1-x C x : H) also makes it possible to considerably reduce their conductivity: typically from 10 ⁇ 2-10 ⁇ 3 to 10 ⁇ 5-10 ⁇ 6 ⁇ 1.cm ⁇ 1. Unfortunately, the layers n+, even carbonaceous, still remain sufficiently conductive to cause the parasitic phenomenon which is described below.
  • the subject of the invention is a memory device of the PC-El type, the structure of which is close to that of FIG. 3 in which the photoconductive layer has any structure (n+-in+ or other) and consists of any photoconductive material in which the lateral or "planar" conductivity is very much higher than that of the other materials of the PC-El structure (typically less than 10 ⁇ 13 ⁇ 1.cm ⁇ 1).
  • the pixel 26 (memory point) is, as shown in plan view in FIG. 4, delimited by the intersection of a lower electrode 12 and an upper electrode 22.
  • the width l EI of this light border is typically from 1 to 50 micrometers.
  • the ignition of the latter is initiated on the edges 30 of the electrode 12 and propagates towards the interior of the pixel as indicated by the arrows Fa.
  • the ignition voltage at the edges 30 of the lower electrode is significantly lower than the intrinsic ignition voltage (that corresponding to an ignition of the interior of the pixel); the difference is typically estimated at 5-10 V.
  • the width of the hysteresis is therefore reduced accordingly. This ignition phenomenon at the edges 30 of the lower electrodes is therefore very harmful for the performance of the screen.
  • planar conduction This conduction is hereinafter called "planar" conduction.
  • FIG. 5 shows the corresponding electrical diagram of the PC-El structure.
  • the dielectric layer 18 is represented by the capacitors C1
  • the set of dielectric and light-emitting layers 14, 16 and 27 is represented by the capacitors C2
  • the photoconductive layer 20 by a resistor R, in the plane of the layer PC.
  • the point N of connection of the capacitors C1 and C2 constitutes the node of the structure PC-El.
  • FIG. 6 diagrammatically shown in FIG. 6 is the variation of the potential Vn of the "node" of the PC-El structure of a pixel as a function of the distance d S from the edge 34 of the upper electrode 22 and on FIG. 7, the variations of the potential V n as a function of the distance d I from the edge 30 of the lower electrode 12.
  • the potential V EI of the lower electrode 12 has also been symbolized, the potential V ES of the upper electrode 22 and the potential V0 corresponding to the limit value of the potential without side effect.
  • the "planar" conductivity in the PC layer causes, in the region outside the pixel and near the edges 34 of the upper electrode 22, an excitation of the layers located under the PC layer (C2) giving rise to lateral conduction from the inside to the outside of the pixel.
  • the lateral conduction causes, as shown in FIG. 6, a drop in the voltage across the terminals of C2 in the pixel when one approaches the edge 30 of the upper electrode.
  • the arrows I on the upper part of Figure 6 indicate the direction of current flow, from the inside to the outside of the pixel.
  • w the pulsation of the voltage applied to the pixel.
  • R 3.109ohms per square
  • w 2 ⁇ kHz
  • C1 50nF / cm2
  • the capacitor C2 contains the electroluminescent layer 16. Also, there is emission of light in the zones of the layer El for which V n exceeds a threshold value Vs. It is seen from FIG. 6, that in a zone 32 (FIG. 4) near edge 30 and with a width l ES proportional to ⁇ ES , there is no light emission.
  • a "planar" conduction also occurs in the PC layer but in the opposite direction as indicated by the arrow J on the upper part of FIG. 7; conduction occurs from the outside to the inside of the pixel for the same polarity of the applied voltage, which corresponds to a discharge of the dielectric layer 18 (capacitor C1) partially excited.
  • this "planar" conduction causes an increase in the potential V n of the node of the PC-El structure at the edge of the pixel with respect to the value V0 inside the pixel. Consequently, the voltage across the capacitor C2 is greater at the edge 30 of the lower electrode of the pixel than inside the pixel.
  • the capacitor C2 contains the emitting layer El 16. Also when the voltage across C2 exceeds a threshold value V s , the light-emitting emission occurs in C2. If one then chooses a voltage applied across the PC-El structure of a value such that V telle is slightly less than V s , the interior of the pixel is in the extinct state because V N is close to V0 and is less than V s , while at the edge 30 of the lower electrode of the pixel, V N can exceed V S. We then observe the lit border 28 (figure 4) of width l EI along the edges 30.
  • This lit border generally causes a premature ignition of the entire pixel by propagation of the lit state gradually. There is therefore a sometimes significant reduction in the ignition voltage and, consequently, a reduction in the hysteresis margin.
  • the subject of the invention is an electroluminescent display screen with memory effect and with a particular configuration of the electrodes making it possible to remedy the drawbacks given above and in the first place making it possible to avoid premature ignition of all the pixels which are extinguished at the threshold of ignition.
  • the first electrodes are the electrodes located between the light-emitting layer and the observer and constitute, depending on whether the PC-El structure is "inverted" or not, the upper or lower electrodes.
  • the second electrodes are located behind the photoconductive material relative to the observer.
  • the width ratio D / d is in the range from 3 to 300.
  • D varies from 50 to 300 micrometers and d is of the order of the width of the dark border (the ES in the figures 4 and 6) from the edge of the second electrodes for good compensation efficiency for the parasitic phenomenon.
  • the width of the dark border l ES varying from 1 to 50 micrometers and typically worth 10 micrometers, d is chosen from 1 to 100 micrometers and is typically 20 micrometers.
  • each first electrode comprises blocks of dimension L in the second direction, at the display points, electrically connected to each other by at least one conductive access strip of width l with l ⁇ L / 2.
  • the ratio L / l is chosen in the range from 3 to 300.
  • L varies in particular from 50 to 300 micrometers and l varies from 1 to 100 micrometers.
  • l is 20 micrometers; it is of the same order of magnitude as the width l EI of the lit border.
  • the alignment accuracy of the edges of the first and second electrodes at the display points varies between 1 and 20 micrometers which allows good compensation for edge effects.
  • the neutralization of the edge effects of the first electrodes and of the second electrodes is maximum, not for perfect alignment of the edges of the first and second electrodes at the image points. but for the edges of the electrodes of one of the families of electrodes situated inside the edges of the electrodes of the other family of electrodes; for example the edges of the second electrodes are located at the inside of the edges of the first electrodes at a given distance of 1 to 20 micrometers and typically 10 micrometers; conversely, the edges of the first electrodes can be located inside the edges of the second electrodes at the display points.
  • second electrodes made up of parallel sub-electrodes and electrically connected to each other, thus dividing each pixel into a sub-pixel, each sub-electrode then being formed, at the level of the sub-pixels, of pavers of dimension A in the first direction, the pavers of the same sub-electrode being interconnected by at least one conductive access strip of width a, with a ⁇ A / 2, and also using first electrodes consisting of parallel sub-electrodes, electrically connected to each other, each comprising, at the level of each sub-pixel thus formed, blocks of dimension B in the second direction, the blocks of the same sub-electrode being connected together by at least one conductive access strip of width b with b ⁇ B / 2.
  • the second electrodes can be made of transparent material or of opaque material depending on whether one wishes to obtain a display screen that is entirely transparent or not.
  • the conductive blocks and their access strips of the same electrode or of the same sub-electrode are produced simultaneously in the same conductive layer.
  • FIGS. 8 to 11 represent different configurations of electrodes in accordance with the invention and FIG. 12 represents a display screen with "inverted" structure.
  • the display screen according to the invention differs from the screens of the prior art only in the configuration of the electrodes.
  • the display screen comprises a transparent glass substrate 10 covered with ITO electrodes 12 oriented in a first direction x (see FIG. 2) having a thickness of 150 nm.
  • These lower electrodes 12 are covered with a dielectric layer 14 supporting a layer of electroluminescent material 16.
  • the electroluminescent material can consist of one or more layers of different electroluminescent materials.
  • electroluminescent materials which can be used in the invention are in particular those described in the article by Shosaku Tanaka et al. SID-88 DIGEST. 293-296 "Bright-White-Light electroluminescent Device with New Phosphor Thin Films Based on SRS", those cited in the article by Hiroshi Kobayashi "Recent Development of Multi-Color Thin Film Electroluminescence Research” Abstract n ° 1231, p. 1712-1713, Extended Abstracts of Electrochemical Society Meeting, vol. 87-2, October 18-23, 1987 or in the article by Shosaku Tanaka "Color Electroluminescence in Alcalin-Earth Sulfide Thin Films", Journal of Luminescence 40 and 41 (1988), p. 20-23.
  • the layer El 16 is made of ZnS: Mn.
  • the light-emitting layer 16 is preferably covered with a dielectric 27 supporting a photoconductive material 20 in the form of a continuous layer, consisting in particular of a-Si 1-x C x : H with x ranging from 0 to 1 and preferably ranging from 0 to 0.5.
  • This material 20 consists of three n+-in+ stacked layers, the n+ layers being obtained by doping with phosphorus of a-Si 1-x C x : H.
  • the electroluminescent layer and the photoconductive material cover the entire display surface of the screen.
  • the photoconductive material is covered with a dielectric 18 supporting electrodes 22 made of an opaque or reflective material such as aluminum.
  • the electrodes 22 are oriented in the direction y perpendicular to the direction x.
  • the photoconductive layer has a thickness of 1 micrometer, the light-emitting layer 16 a thickness of 0.5 to 2 micrometers and the dielectric layers 14, 27, 18 can be made of one of the materials chosen from Si3N4, SiO2, SiO x N y , Ta2O5 and have a thickness of 20 to 400 nm.
  • the display screen control means are symbolized by blocks 23 and 25 ( Figure 2) and do not differ in any way from those of the prior art.
  • Part A illustrates the arrangement of the electrodes at a display point 26 and part B shows an overview of the configuration of part A.
  • the lower electrodes 12 are in the form of continuous conductive strips having a constant width P and the upper electrodes 22 consist of rectangular conductive blocks 40, of dimension D in the direction x, electrically connected together by a strip d conductive access 42 of width d in the direction x with d ⁇ D / 2.
  • the dark border 32 appears on the entire periphery of the block 40 and the light border 28 only appears in the access strip 42 thus avoiding the premature ignition of the pixel.
  • the access strip 42 has a width d of the same order of magnitude as ES .
  • This width P is chosen to be large enough to promote the compensation effect and to facilitate alignment of the upper electrodes 22 with respect to the lower electrodes.
  • This width defines the required alignment precision, that is to say the distance p separating the edges 44 of the blocks 40 from the edges 34 of the lower electrodes 12.
  • the precision is generally chosen to be of the order of magnitude of d and is typically 20 micrometers, which corresponds to a distance p equal to about 10 micrometers.
  • FIG. 8 An improvement in the configuration of FIG. 8 consists in multiplying the number of access bands to the blocks 40 of the upper electrodes 22. This is shown in FIG. 9. In this figure, each block is equipped with two access bands 42a and 42b parallel to each other. Of course, the number of access bands to each block 40 can be greater.
  • the access strips 42a and 42b of the same block 40 using a conductive bridge 46 located outside the upper electrode strips 12
  • the multiple access strips 42a and 42b are parallel to the direction y while the gateways 46 are oriented in the direction x parallel to the lower electrodes 12.
  • the conductive strips constituting the upper electrodes 12 have a constant width P of 200 micrometers and are separated by 100 micrometers; the blocks 40 constituting the upper electrodes 22 have a dimension D of 200 micrometers and a dimension D ′ of 160 micrometers; the access strips 42, 42a and 42b have a width d of 20 micrometers; the walkways 46 have a width e of 40 micrometers; the blocks 40 of the same electrode 22 are spaced apart from each other by 140 micrometers and the blocks of two consecutive electrodes 22 are spaced apart from 100 micrometers.
  • each pixel 26 it is also possible to divide, at each pixel 26, the upper electrodes 22 in the form of sub-electrodes 48 as described in the document FR-A-2 602 897 filed in the name of the inventor.
  • These sub-electrodes 48 are connected together by conductive links 51 and define sub-pixels 26a. They are parallel and oriented in the y direction.
  • each sub-electrode 48 is made up, at the sub-pixels 26a, of blocks 48a having a dimension A in the direction x, these blocks being electrically connected together by one or more conductive strips 50 of width a, in direction x, with a ⁇ A / 2.
  • a / a is chosen in the range from 3 to 300.
  • the lower electrodes 12 can also be divided into parallel sub-electrodes, electrically connected to each other. These lower electrodes 12 can be in the form of continuous parallel strips 53 of constant width, as shown in FIG. 10A.
  • sub-electrodes 53 consisting, at each sub-pixel which they define with the upper electrodes and as shown in FIG. 10B, blocks 53a of dimension B according to the direction x, electrically connected to each other by access strips 55 of width b in direction y, with b ⁇ B / 2.
  • B / b is chosen in the range from 3 to 300.
  • the blocks 48a are housed entirely in the blocks 53a, the distance separating the edges of the blocks 48a from those of the blocks 53a being approximately 10 micrometers. Conversely, it is possibly possible to arrange the blocks 53a inside the blocks 48a.
  • the electrodes lower 12 are made up of rectangular conductive blocks 52 of dimension L in the direction y, at each display point 26, these blocks 52 being electrically connected together by conductive access strips 54 having a width l, with l ⁇ L / 2.
  • the configuration of the access strips 54 to the blocks 52 of the lower electrodes 12 is similar to that of the access strips 42, 42a and 42b of the upper electrodes.
  • these access strips may be two in number, as shown in FIG. 11 and be connected to each other by conductive gateways 56.
  • the electrode configuration shown in FIG. 11 serves to minimize the edge effects of the upper electrodes 22, namely the premature extinction effect, while minimizing the edge effect of the lower electrodes 12, namely the effect early ignition.
  • edges 44 of the blocks 40 of the upper electrodes 22 and the edges 58 of the blocks 52 of the lower electrodes 12 must be aligned as best as possible.
  • the alignment accuracy of edges 44 and 58 varies from 1 to 20 micrometers.
  • edges 44 of the blocks 40 of the upper electrodes are advantageously chosen to be located inside the edges 58 of the blocks 52 of the lower electrodes.
  • the distance t between the edges 44 and 58 is approximately 10 micrometers.
  • l and d of the access strips 54 and 42 respectively are equal to 20 micrometers
  • the dimensions of the blocks 40 and 52 in the direction x are worth respectively 180 and 200 micrometers
  • This screen comprises from bottom to top, a substrate 10a, opaque column electrodes 22a, a first dielectric 18a, the photoconductive layer 20a, a second dielectric 27a, the light-emitting layer 16a, a third dielectric 14a and finally the transparent line electrodes 12a to through which the observation is made.
  • the opaque or reflective electrodes 22a which are in contact with the substrate and not the transparent electrodes 12a.
  • the substrate 10a can therefore be opaque.

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  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
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  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
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Claims (14)

  1. Elektrolumineszenzanzeigebildschirm mit Speicherwirkung, der auf einem isolierenden Substrat (10,10a) umfaßt:
    - eine Familie von ersten transparenten Elektroden (12,12a), die parallel zu einer ersten Richtung (x) orientiert sind,
    - ein erstes Dielektrikum (14,14a), welches die ersten Elektroden bedeckt,
    - eine Elektrolumineszensschicht (16,16a) und ein Photoleitermaterial (20,20a), welches die ganze Anzeigefläche bedeckt und auf dem ersten Dielektrikum aufsitzt, wobei das Photoleitermaterial eine laterale Leitfähigkeit aufweist, die größer ist als diejenige der anderen Materialien (12,12a, 14,14a, 16,16a, 18,18a, 27,27a, 22,22a), die den besagten Schirm bilden,
    - ein zweites Dielektrikum (18), welches das Photoleitermaterial bedeckt,
    - eine Familie von zweiten Elektroden (22), welche auf dem zweiten Dielektrikum angeordnet sind und gemäß einer zweiten Richtung (y) senkrecht zur ersten Richtung orientiert sind, wobei ein Pixel (26) durch die Überschneidung einer ersten Elektrode (12,12a) und einer zweiten Elektrode (22,22a) definiert ist, und
    - Pixelsteuervorrichtungen (23, 25), die mit den beiden Familien von Elektroden verbunden sind,
    dadurch gekennzeichnet, daß auf dem Niveau jedes Pixels (20) die zweiten Elektroden Plättchen (40) umfassen der Dimension D in der ersten Richtung, wobei die Plättchen einer selben zweiten Elektrode elektrisch untereinander mittels mindestens eines Leitungsbandes (42,42a,42b) der Länge d in der ersten Richtung verbunden sind, wobei d<D/2 ist, und die Ränder (44) der zweiten Elektroden (22) im Inneren oder an den Rändern (34, 58) der ersten Elektroden angeordnet sind.
  2. Elektrolumineszenzanzeigebildschirm mit Speicher-wirkung, der auf einem isolierenden Substrat (10,10a) umfaßt:
    - eine Familie von ersten transparenten Elektroden (12,12a), die parallel zu einer ersten Richtung (x) orientiert sind,
    - ein erstes Dielektrikum (14,14a), welches die ersten Elektroden bedeckt,
    - eine Elektrolumineszensschicht (16,16a) und ein Photoleitermaterial (20,20a), welches die ganze Anzeigefläche bedeckt und auf dem ersten Dielektrikum aufsitzt, wobei das Photoleitermaterial eine laterale Leitfähigkeit aufweist, die größer ist als diejenige der anderen Materialien (12,12a, 14,14a, 16,16a, 18,18a, 27,27a, 22,22a), die den besagten Schirm bilden,
    - ein zweites Dielektrikum (18), welches das Photoleitermaterial bedeckt,
    - eine Familie von zweiten Elektroden (22), welche auf dem zweiten Dielektrikum angeordnet sind und in einer zweiten Richtung (y) senkrecht zur ersten Richtung orientiert sind, wobei ein Pixel (26) durch die Überschneidung einer ersten Elektrode (12,12a) und einer zweiten Elektrode (22,22a) definiert ist, und
    - Pixelsteuervorrichtungen (23, 25), die mit den beiden Familien von Elektroden verbunden sind,
    dadurch gekennzeichnet, daß auf der Ebene jedes Pixels (20) die zweiten Elektroden Plättchen (40) umfassen der Dimension D in der ersten Richtung, wobei die Plättchen einer selben zweiten Elektrode elektrisch untereinander mittels mindestens eines Leitungsbandes (42,42a,42b) der Länge d in der ersten Richtung verbunden sind, wobei d<D/2 ist, und wobei die ersten Elektroden Plättchen (52) der Dimension L in der zweiten Richtung (y) umfassen, wobei die Plättchen (52) von jeder ersten Elektrode elektrisch untereinander mittels mindestens eines Leitungsbandes (54) der Länge 1 in der zweiten Richtung verbunden sind, mit 1<L/2, und die Ränder (44) der Elektroden (22) der einen der beiden Elektrodenfamilien im Innern der Ränder (34, 58) der Elektroden der anderen Elektrodenfamilie angeordnet sind.
  3. Elektrolumineszenzanzeigebildschirm nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Verhältnis D/d im Intervall zwischen 3 bis 300 liegt.
  4. Elektrolumineszenzanzeigebildschirm nach Anspruch 2, dadurch gekennzeichnet, daß die Ränder (44) der zweiten Elektroden auf dem Niveau jedes Pixels im Innern der Ränder (34, 58) der ersten Elektroden angeordnet sind.
  5. Elektrolumineszenzanzeigebildschirm nach einem der vorangegangenen Ansprüche 1-4, dadurch gekennzeichnet, daß die Anzahl der Leitungsbänder (42a,42b), welche zwei aufeinanderfolgende Plättchen (40) einer selben zweiten Elektrode miteinander verbinden, mindestens gleich 2 ist.
  6. Elektrolumineszenzanzeigebildschirm nach Anspruch 5, dadurch gekennzeichnet, daß die Leitungsbänder (42a,42b) zu einem selben Plättchen der zweiten Elektroden untereinander durch eine leitende Brücke (46) verbunden sind, die im wesentlichen parallel zu den ersten Elektroden (12) und außerhalb dieser angeordnet ist.
  7. Elektrolumineszenzanzeigebildschirm nach einem der vorangegangenen Ansprüche 2-6, dadurch gekennzeichnet, daß das Verhältnis L/1 im Intervall zwischen 3 - 300 liegt.
  8. Elektrolumineszenzanzeigebildschirm nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß der Abstand (p), welcher die Ränder der ersten und zweiten Elektroden auf dem Niveau der Pixel voneinander trennt, im Bereich zwischen 1 - 20 »m gewählt ist.
  9. Elektrolumineszenzanzeigebildschirm nach einem der vorangegangenen Ansprüche 2-8, dadurch gekennzeichnet, daß die Anzahl der Leitungsbänder (54), welche zwei aufeinenderfolgende Plättchen einer selben ersten Elektrode (12) verbinden, mindestens gleich 2 ist.
  10. Elektrolumineszenzanzeigebildschirm nach Anspruch 9, dadurch gekennzeichnet, daß die Leitungsbänder (54) zu einem selben Plättchen der ersten Elektroden untereinander durch eine leitende Brücke (56) verbunden sind, die parallel zu den zweiten Elektroden (22) und außerhalb dieser angeordnet ist.
  11. Elektrolumineszenzanzeigebildschirm mit Speicher-wirkung, der auf einem isolierenden Substrat (10,10a) umfaßt:
    - eine Familie von ersten transparenten Elektroden (12,12a), die parallel zu einer ersten Richtung (x) orientiert sind,
    - ein erstes Dielektrikum (14,14a), welches die ersten Elektroden bedeckt,
    - eine Elektrolumineszensschicht (16,16a) und ein Photoleitermaterial (20,20a), welches die ganze Anzeigefläche bedeckt und auf dem ersten Dielektrikum aufsitzt, wobei das Photoleitermaterial eine laterale Leitfähigkeit aufweist, die größer ist als diejenige der anderen Materialien (12,12a, 14,14a, 16,16a, 18,18a, 27,27a, 22,22a), die den besagten Schirm bilden,
    - ein zweites Dielektrikum (18), welches das Photoleitermaterial bedeckt,
    - eine Familie von zweiten Elektroden (22), welche auf dem zweiten Dielektrikum angeordnet sind und in einer zweiten Richtung (y) senkrecht zur ersten Richtung orientiert sind, wobei ein Pixel (26) durch die Überschneidung einer ersten Elektrode (12,12a) und einer zweiten Elektrode (22,22a) definiert ist, und
    - Pixelsteuervorrichtungen (23, 25), die mit den beiden Familien von Elektroden verbunden sind, dadurch ge kennzeichnet, daß jede zweite Elektrode (22) auf dem Niveau der Pixel (26) aus ersten parallelen Unterelektroden (48) gebildet ist, welche elektrisch unter einander verbunden sind, wodurch Unterpixel (26) definiert werden, und wobei diese ersten Unterelektroden umfassen Plättchen (48a) umfassen der Dimension A in einer ersten Richtung (x) auf dem Niveau von jedem Unterpixel (26a), wobei die Plättchen einer selben ersten Unterelektrode (48) untereinander mit mindestens eines Leitungsbandes (50) verbunden sind von einer Größe a in der ersten Richtung, wobei a<A/2 ist, und wobei die Ränder dieser ersten Unterelektroden auf dem Niveau der Unterpixel im Innern oder an den Rändern der ersten Elektroden angeordnet sind.
  12. Elektrolumineszenzanzeigebildschirm mit Speicher-wirkung, der auf einem isolierenden Substrat (10,10a) umfaßt:
    - eine Familie von ersten transparenten Elektroden (12,12a), die parallel zu einer ersten Richtung (x) orientiert sind,
    - ein erstes Dielektrikum (14,14a), welches die ersten Elektroden bedeckt,
    - eine Elektrolumineszensschicht (16,16a) und ein Photoleitermaterial (20,20a), welches die ganze Anzeigefläche bedeckt und auf dem ersten Dielektrikum aufsitzt, wobei das Photoleitermaterial eine laterale Leitfähigkeit aufweist, die größer ist als diejenige der anderen Materialien (12,12a, 14,14a, 16,16a, 18,18a, 27,27a, 22,22a), die den besagten Schirm bilden,
    - ein zweites Dielektrikum (18), welches das Photoleitermaterial bedeckt,
    - eine Familie von zweiten Elektroden (22), welche auf dem zweiten Dielektrikum angeordnet sind und in einer zweiten Richtung (y) senkrecht zur ersten Richtung orientiert sind, wobei ein Pixel (26) durch die Überschneidung einer ersten Elektrode (12,12a) und einer zweiten Elektrode (22,22a) definiert ist, und
    - Pixelsteuervorrichtungen (23, 25), die mit den beiden Familien von Elektroden verbunden sind,
    dadurch gekennzeichnet, daß jede zweite Elektrode (22) auf dem Niveau der Pixel (26) aus ersten parallelen Unterelektroden (8) gebildet ist, die elektrisch untereinander verbunden sind, und daß jede erste Elektrode (12) auf dem Niveau der Pixel (26) aus zweiten parallelen Unterelektroden (53) gebildet ist, welche elektrisch untereinander verbunden sind, wobei die ersten und zweiten Unterelektroden an ihrer Überschneidung Unterpixel (26a) definieren, wobei diese ersten Unterelektroden Plättchen (48a) umfassen der Dimension A in der ersten Richtung (x) auf dem Niveau jedes Unterpixels (26a), wobei die Unterpixel einer ersten selben Unterelektrode (48) elektrisch untereinander mittels mindestens eines Leitungsbandes (50) der Größe a gemäß der ersten Richtung verbunden sind, wobei a<A/2 ist, und wobei die zweiten Unterelektroden Plättchen (53a) umfassen der Dimension B in einer zweiten Richtung (y) auf dem Niveau jedes Unterpixels, wobei die Plättchen einer selben Unterelektrode elektrisch untereinander mittels mindestens eines Leitungsbandes (55) der Länge B in der zweiten Richtung verbunden sind, mit b<B/2, wobei die Ränder der Unterelektroden der einen der beiden Unterelektroden-Familien auf dem Niveau jedes Unterpixels (26a) im Inneren der Ränder der Unterelektroden der anderen Unterelektroden-Familie angeordnet sind.
  13. Elektrolumineszenzanzeigebildschirm nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß ein dielektrisches Medium (27,27a) zwischen den Elektrolumineszenzschichten (16,16a) und dem Photoleitermaterial (20,20a) vorgesehen ist.
  14. Elektrolumineszenzanzeigebildschirm nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß die zweiten Elektroden (22) aus einem reflektierenden Material geformt sind.
EP90400980A 1989-04-12 1990-04-10 Elektrolumineszenzanzeigebildschirm mit Speicher und mit besonderer Elektrodenkonfiguration Expired - Lifetime EP0392918B1 (de)

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FR8904811 1989-04-12
FR8904811A FR2645998B1 (fr) 1989-04-12 1989-04-12 Ecran d'affichage electroluminescent a memoire et a configuration particuliere d'electrodes

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EP0392918B1 true EP0392918B1 (de) 1994-06-29

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FR2671218A1 (fr) * 1990-12-28 1992-07-03 France Etat Dispositif d'affichage electroluminescent a memoire et a plusieurs teintes.
KR100267700B1 (ko) * 1995-12-30 2000-10-16 가시오 가즈오 신호광에 따른 표시조작수행 표시장치 및 구동방법
US6054809A (en) * 1996-08-14 2000-04-25 Add-Vision, Inc. Electroluminescent lamp designs
US6091383A (en) * 1997-04-12 2000-07-18 Lear Automotive Dearborn, Inc. Dimmable ELD with mirror surface
JP2000058270A (ja) * 1998-08-04 2000-02-25 Sony Corp 光学素子および有機ｅｌディスプレイ
JP4292245B2 (ja) * 2001-02-05 2009-07-08 三星モバイルディスプレイ株式會社 発光体、発光素子、及び発光表示装置
US7266778B2 (en) * 2002-10-02 2007-09-04 Hewlett-Packard Development Company, L.P. Freezable projection display
JP4148182B2 (ja) * 2004-05-17 2008-09-10 ソニー株式会社 表示装置
US20090006198A1 (en) * 2007-06-29 2009-01-01 David George Walsh Product displays for retail stores

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US3786307A (en) * 1972-06-23 1974-01-15 Atronics Corp Solid state electroluminescent x-y display panels
US4602189A (en) * 1983-10-13 1986-07-22 Sigmatron Nova, Inc. Light sink layer for a thin-film EL display panel
US4614668A (en) * 1984-07-02 1986-09-30 Cordis Corporation Method of making an electroluminescent display device with islands of light emitting elements
FR2574972B1 (fr) * 1984-12-18 1987-03-27 Thioulouse Pascal Dispositif d'affichage a effet memoire comprenant des couches electroluminescente et photoconductrice superposees
FR2580848B1 (fr) * 1985-04-17 1987-05-15 Menn Roger Ecran matriciel, son procede de fabrication et dispositif d'affichage matriciel a plusieurs nuances de couleurs, commande en tout ou rien, comportant cet ecran
FR2602897B1 (fr) * 1986-08-18 1988-11-10 Thioulouse Pascal Afficheur electroluminescent a photoconducteur a faible taux de remplissage
FR2605777B1 (fr) * 1986-10-23 1989-02-17 France Etat Dispositif d'affichage electroluminescent utilisant du silicium amorphe hydrogene et carbone

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US5053675A (en) 1991-10-01
FR2645998A1 (fr) 1990-10-19
FR2645998B1 (fr) 1991-06-07
JPH02298984A (ja) 1990-12-11
DE69010255D1 (de) 1994-08-04
EP0392918A1 (de) 1990-10-17

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