EP0905670A1 - Vereinfachung einer Mikrospitzen-Anzeige mit einer Rücksetzungselektrode - Google Patents

Vereinfachung einer Mikrospitzen-Anzeige mit einer Rücksetzungselektrode Download PDF

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Publication number
EP0905670A1
EP0905670A1 EP98410111A EP98410111A EP0905670A1 EP 0905670 A1 EP0905670 A1 EP 0905670A1 EP 98410111 A EP98410111 A EP 98410111A EP 98410111 A EP98410111 A EP 98410111A EP 0905670 A1 EP0905670 A1 EP 0905670A1
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EP
European Patent Office
Prior art keywords
cathode
grid
lines
line
potential
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98410111A
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English (en)
French (fr)
Inventor
Bernard Bancal
Jean-François Peyre
Philippe Peyron
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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Pixtech SA
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Filing date
Publication date
Application filed by Pixtech SA filed Critical Pixtech SA
Publication of EP0905670A1 publication Critical patent/EP0905670A1/de
Withdrawn legal-status Critical Current

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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

Definitions

  • the present invention relates to the field of screens microtip viewing dishes.
  • Figure 1 shows schematically the structure of a flat screen with microtips of the type to which the invention relates.
  • 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 of which a glass substrate 6 generally constitutes the surface screen.
  • Cathode conductors are arranged in columns on a glass substrate 10.
  • the microtips 2 are produced on a resistive layer 11 deposited, for example, on the conductors cathode and are conventionally arranged inside meshes defined by the cathode conductors.
  • Figure 1 partially represents the interior of a mesh, the conductors cathode do not appear in this figure.
  • Cathode 1 is associated with grid 3 which is organized in lines. The intersection of a row in grid 3 and a column in the cathode 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.
  • the anode 5 is, for example, provided with alternating strips of elements phosphors 7, each corresponding to a color (blue, Red Green). The bands are separated from each other by a insulator 8.
  • the phosphor elements 7 are deposited on electrodes 9, consisting of corresponding strips of a layer transparent conductor such as indium tin oxide (ITO).
  • ITO indium tin oxide
  • the sets of blue, red, green bands are alternately polarized with respect to cathode 1 so that the electrons extracted from microtips 2 of a pixel of the cathode / grid are alternately directed towards the phosphor elements 7 opposite each of the colors.
  • the anode In the case of a monochrome screen (not shown), the anode consists of a plan of phosphors of the same color or of two sets alternating bands of phosphor elements of the same color.
  • the present invention relates more particularly to the cathode / grid of such a screen.
  • Figures 2A to 2D illustrate an example of structure conventional cathode / microtip screen grid, Figures 2B and 2D being respectively enlargements of parts Figures 2A to 2C.
  • Multiple microtips 2, for example sixteen, are arranged in each mesh 12 defined by the cathode conductors 13 ( Figure 2B).
  • the intersection of a line 14 of grid 3 and a column 15 of cathode 1 corresponds here, for example, at sixty-four meshes 12 of a pixel of cathode ( Figure 2A).
  • Cathode 1 generally consists of layers successively deposited on the glass substrate 10.
  • the figures 2C and 2D partially represent a sectional view according to the line A-A 'in Figure 2B.
  • a conductive layer is deposited on the substrate 10. This layer is etched in a pattern of columns 15, each column having meshes 12 surrounded cathode conductors 13.
  • a resistive layer 11 is then deposited on these cathode conductors 13. This resistive layer is intended to protect each microtip 2 against an excess of current when starting a microtip 2.
  • Such a resistive layer 11 homogenizes the electronic emission of the microtips 2 of a pixel of cathode 1 and thus increases its lifespan.
  • the resistive layer is deposited, either on the conductive layer constituting the cathode conductors, either under this layer conductive as described in the document EP-A-0 696 045.
  • An insulating layer 16 is deposited on the layer resistive it to isolate the cathode conductors 13 from the grid 3 ( Figure 2D), formed in a conductive layer. Of holes 4 and wells 17 are respectively made in the layers 3 and 16 to receive the microtips 2.
  • the resistive layer 11 must, most often, be engraved, in columns corresponding to the columns (15, Figure 2A) of the cathode. Such an engraving requires a separate mask from that used for making cathode conductors, the resistive layer not being meshed.
  • FIG. 3 illustrates schematically and in perspective, an example of conventional addressing of a microtip screen.
  • An image is displayed for a period of time image (for example, 20 ms for a frequency of 50 hertz) in suitably polarizing the anode 5, the cathode 1 and the grid 3 by means of an electronic control circuit (partially shown for the grid control).
  • the plane phosphor elements of the anode Being a monochrome screen anode 5, the plane phosphor elements of the anode is permanently polarized at a potential Va making it possible to attract the electrons emitted by the microtips 2.
  • This potential is chosen taking into account, in particular, the distance between the cathode / grid and the anode and is, for example, of the order of 400 volts.
  • the bands of phosphors of the anode are sequentially polarized by a set of bands of the same color during a frame time corresponding to a third of the reduced image time times required for switching.
  • the display is done line by line, polarizing sequentially the lines L of the grid 3 during a "time of line "during which each column K of cathode 1 is carried at a potential Vk which is a function of the brightness of the pixel at display along the current line (for example, Lj). Polarization columns K of cathode 1 changes with each new line.
  • a "line time” (for example 40 ⁇ s) corresponds to the duration of a frame divided by the number of lines L of the grid 3.
  • the current line Lj is brought to a potential + Vg (by example, 40 volts) while the other lines Lj-1, Lj + 1 are at a potential -Vg (for example, -40 volts) during this time of line.
  • the lines of grid 3 addressed sequentially are individually controlled by an amplifier 20, generally essentially consisting of two MOS transistors P and N connected in series between two supply lines at potentials + Vg and -Vg.
  • the midpoint of serial association of transistors P and N is connected to the grid line to which the amplifier 20 is associated and the MOS transistors, respectively P-channel and N-channel receive signals on their gates control (not shown) adapted to successively polarize lines with high potential + Vg, all unaddressed lines being brought to low potential -Vg. It is indeed necessary to reduce the unaddressed lines to the potential -Vg so as to avoid that a previously addressed line has sufficient potential allowing the extraction of electrons.
  • a disadvantage of conventional screens is that amplifiers 20 must be made in CMOS technology, this which increases the cost of the control circuit.
  • CMOS technology is far from negligible compared to the size and overall cost of the ordered.
  • this solution requires the addition an additional cathode column, and this column should, in practice, be located outside the active area of the screen, that is to say the display area, which increases the size of the screen.
  • this column should, in practice, be located outside the active area of the screen, that is to say the display area, which increases the size of the screen.
  • the additional electrode is placed at one end of the grid lines leads that the lowering of the potential of the line that has just been addressed the longer the grid lines are. This is why this document plans to add a second reset column at the other end of the screen. That further increases the size of the screen surface without constitute an optimal solution.
  • provide reset columns distributed among display columns cathode is an unsuitable solution.
  • the present invention aims to propose a new solution to simplify the structure of sequential addressing amplifiers of the scan lines of a flat display with microtips.
  • the present invention aims, in particular, to propose a solution that does not require electronic transmission.
  • the present invention also aims to provide a solution which does not lead to an increase in the surface of the screen, nor to a decrease in the resolution of a conventional screen.
  • the present invention also aims to provide a solution which does not require modification of the anode of a classic screen.
  • the present invention aims also that the simplification of amplifier structure of sequential addressing of the lines is accompanied by a simplification of the method for producing the screen cathode.
  • the present invention provides a flat display screen, comprising a cathode with electronic emission microdots associated with an extraction grid of microdots, the cathode / grid comprising grid or cathode conductive lines suitable for be addressed sequentially, and cathode columns or grid respectively perpendicular to said lines and proper to be addressed individually and simultaneously during line addressing, the screen further comprising an electrode recall capable of being biased at a recall potential corresponding to a potential for absence of electron extraction, each grid or cathode line being connected, via at least one resistive element, to the return electrode.
  • the return electrode consists of conductive lines, inserted between two neighboring lines of the grid or cathode, and interconnected to the return potential.
  • said grid or cathode lines and the electrode lines recall are made in the same conductive layer engraved, each line of the return electrode being spaced from two lines adjacent to the grid or the cathode.
  • a resistive layer is present on or under said layer conductive.
  • each line of the grid is associated with a control amplifier one output stage of which exclusively comprises a transistor P channel MOS, sandwiched between a high addressing potential and the line, the return electrode being polarized at a low potential.
  • each conductive line of the return electrode is dimensioned to form a resistive element between a grid line neighbor and the potential for recall.
  • each line of the cathode is addressable by an amplifier control of which one output stage exclusively comprises a transistor N-channel MOS, sandwiched between a low addressing potential and the line, the return electrode being polarized at a high potential.
  • the microtips are deposited on said resistive layer forming a resistive element between each cathode line and the electrode reminder.
  • the return electrode consists of conductors, interposed between the grid columns and separated from the conductive layer in which the lines of the cathode are formed, by the resistive layer.
  • the reminder electrode is polarized between the addressing periods of two successive lines, and is left floating for addressing lines.
  • a feature of the present invention is bring each scan line that has just been addressed to a potential corresponding to a potential for no electronic emission, by means of an ohmic contact of this line of scanning with a return electrode polarized at this potential.
  • a screen according to the present invention consists of a microtip cathode associated with a grid, the cathode / grid being placed opposite an anode cathodoluminescent provided with phosphor elements.
  • the display an image is performed by sequentially addressing electrodes in rows of the grid or cathode, electrodes in perpendicular columns of the cathode or grid being addressed simultaneously and individually during addressing of each line to fix the respective brightness of the pixels defined by the intersections of the columns with the current row.
  • the brightness of the color component of the corresponding pixel, the anode being, by example, with three sets of alternating bands of elements phosphors of different colors.
  • the scanning electrodes are formed by lines grid conductors.
  • the cathode is then, according to this first aspect, a classic cathode organized in columns whose addressing is also carried out in a conventional manner.
  • each line of the grid is connected, via at least one element resistive, to a so-called reset or return electrode, polarized at a low potential corresponding to a potential at which the grid lines prevent the emission of electrons.
  • FIG. 4 represents, partially and in top view, a first embodiment of a cathode / grid according to the first aspect of the invention.
  • each line of the grid is individually addressable and sequentially, by means of a control amplifier 21.
  • each amplifier 21 consists of a single MOS transistor, here with P channel, connected between a potential top of addressing + Vg and the corresponding line.
  • Each transistor P is, for example, controlled by a two-state signal C, a given line being addressed when the signal C is in a low state, i.e. at a potential sufficiently lower than the potential + Vg to turn on the corresponding transistor P. Unaddressed lines are therefore left to a floating potential from the point of view of the control amplifiers 21 of these lines.
  • each line 14 of the grid is connected, via a section resistive 22, to a conductor 23 polarized at a low potential -Vg.
  • the sections 22 are, for example, made up of a conductor very fine so as to make the contact between each resistive line 14 and conductor 23.
  • each line 14 of the grid is, at the end of addressing, reduced to a sufficiently sufficient potential low to prevent any electronic emission by this line.
  • the dimensioning of the resistive sections 22 depends on the functional characteristics of the screen, and in particular respective values of the addressing potentials.
  • the sections 22 are produced, preferably, at the same time as the construction of lines 14.
  • the sections 22 are preferably made of the same material as lines 14 and electrode 23, from a layer conductive deposited on the insulation layer (16, Figures 2C and 2D) separating the grid from the cathode.
  • the return electrode is, for example, polarized in permanence at potential -Vg.
  • a dissipation appears in the resistive element connecting a line being addressed to the return electrode.
  • provision may be made not to polarize the electrode as a reminder that between two line times. In this case only dissipation that occurs while the return electrode is polarized is related to the recall, towards the low potential, of the line electrode that has just been addressed.
  • sections 22 can be made up of conductors 120 mm long and 12 ⁇ m wide. With a material (e.g. niobium) having resistance square of 4 ⁇ , we obtain a resistance of 40 k ⁇ by section 22. If the potential + Vg is 80 volts, the potential -Vg being the mass and the addressing potentials Vk of the columns being between 0 and 40 volts, the leakage current linked to the section 22 is of the order of 2 mA, which causes dissipation about 160 mW. Of course, the layout of the sections 22 may have various shapes (serpentine, zigzag, etc.) allowing achieve the desired resistance depending on the space available.
  • a material e.g. niobium
  • Figure 5 illustrates, in a partial perspective view cut, a second embodiment of a cathode / grid a microtip screen according to the first aspect of the invention.
  • Cathode 1 produced on a substrate 10, for example glass, consists of 13 conductors organized in columns from a conductive layer.
  • a first resistive layer 11 of homogenization of the electronic emission is interposed between the cathode conductors 13 and the microtips 2 which are deposited on this resistive layer.
  • the structure of the cathode shown in Figure 5 can be similar to that illustrated by Figures 2A to 2C.
  • the layer resistive may be deposited under the cathode conductors, the microtips 2 being preferably deposited on the layer resistive 11, in the center of the mesh defined by the conductors cathode.
  • Cathode 1 is separated from grid 3 by a layer insulator 16 and the grid is formed in a conductive layer 24, engraved according to a pattern of lines 14 perpendicular to the cathode columns.
  • additional conductors 27 are inserted between the lines 14 of the grid. These conductors 27 are interconnected at one of their ends and constitute the return electrode at low potential -Vg (figure 4).
  • Each line 14 of the grid is addressed by an amplifier 21 as shown in FIG. 4.
  • a layer resistive 26 is added to layer 24 in which are lines 14 and 27 constitute each line 14 of the grid 3 is therefore, laterally, in resistive contact with two conductors 27.
  • An advantage of this embodiment compared to embodiment illustrated in Figure 4 is that the resistance of contact between grid lines 14 and lines 27 is homogeneous along lines 14.
  • Figure 6 illustrates a third embodiment of the first aspect of the invention which differs from the embodiment exposed in relation to FIG. 5, by the fact that the resistive layer 26 ′, for organizing resistive contacts between lines 14 of grid 3 and intermediate lines 27 of the return electrode is under the conductive layer 24 '.
  • An advantage of the present invention is that it simplifies the constitution of line control amplifiers without the need to transmit electronics by dedicated microtips, which improves the lifespan of the screen.
  • the fine conductors 22 ( Figure 4) or intermediate lines 27 ( Figure 5, 6) of the return electrode may be of a bulk low enough to be inserted between each line 14 of the grid without affecting the resolution of the screen.
  • the electrodes sequentially addressed scans consist of conductor lines of the microtip cathode, and the electrodes addressed simultaneously consist of columns grid conductors.
  • FIG. 7 represents, partially and seen from above, an embodiment of a cathode / grid according to this second aspect.
  • FIG. 8 is a partial view, in cut perspective, a cathode / grid according to this embodiment.
  • the scanning line recall electrode is intended to be in resistive contact with the lines of the cathode.
  • a conductive layer 28 is deposited full plate on the substrate 10. This layer 28 is etched according to a definition pattern 15 'cathode lines and intermediate conductors 29 of the return electrode. Although it is not shown in FIGS. 7 and 8, the lines 15 ′ of the cathode are preferably engraved with a mesh pattern (12, Figure 2A, 2B).
  • a resistive layer 11 is deposited full plate on (or under) cathode conductors and intermediate conductors 29.
  • the intermediate conductors 29 interposed between the lines 15 ' are interconnected at one end of the screen and the interconnect line 30 ( Figure 7) is intended to be polarized to a high potential + V1 corresponding to a potential for no emission electronic.
  • Each 15 'line can be addressed individually by means of a control amplifier 32 (FIG. 7), essentially consisting here of an N-channel MOS transistor connected between the end of line 15 'and a low potential -V1 for addressing the line concerned.
  • the N transistors are sequentially controlled by signals C 'with two states, one line being addressed when signal C 'is in a high state (at a potential greater than the potential -V1) making the conductor transistor N.
  • Unaddressed lines are left floating by their respective control amplifiers 32.
  • the return electrode is permanently polarized, or temporarily at the end of each line time.
  • the resistive layer 11, deposited full plate on the lines 15 'and 29, forms a resistive bond between each line 15 'of the cathode and the two intermediate conductors 29 which frame it.
  • the lines are brought back, at the end of addressing and through the resistive layer 11, at the potential + V1 preventing electronic transmission.
  • the microtips 2 are deposited on the resistive layer 11 in the meshes (12, FIGS. 2A, 2B) defined by the conductors (13, FIG. 2B) of lines 15 ', in holes 4 etched in the insulating layer 16 and in a conductive layer 24 in which the grid is produced by being organized in 14 'columns.
  • Columns 14 'of the grid are addressable individually and simultaneously by being each brought to a potential corresponding to the desired brightness for the pixel defined by the intersection of the line 15 'of addressed cathode and of the corresponding column 14 '.
  • the potential -V1 is equal to -40 volts, the potential + V1 corresponding to +40 volts.
  • An advantage of the invention according to this second aspect, where the addressing of the grid and the cathode is reversed with respect to a conventional screen, is that the amplifiers 32 for controlling the lines can be made using MOS transistors only at channel N.
  • Another advantage of providing such reverse addressing is that this saves a resistive layer (26, figure 5 - 26 ′, FIG. 6), and the resistive layer 11 of homogenization is used of electronic emission to achieve resistive contact to the return electrode.
  • the resistive layer 11 is etched according to the pattern of lines 15 'of the cathode. In this case, sections of this resistive layer, perpendicular to the lines 15 ', are maintained to contact the conductors 29.
  • Such an embodiment is, for example, intended for a screen in which the substrate 10 constitutes the surface of the screen.
  • the cathode conductors and the conductors 29 are preferably made on the resistive layer 11 deposited directly on the substrate 10, and the cathode conductors have a structure meshed.
  • the conductors of the return electrode are deposited on the resistive layer 11, between the columns of the grid and parallel to them.
  • the insulating layer (16, figure 8) is etched before the deposition of the conductive grid layer which is etched, in the same step, according to the pattern of the columns 14 'of the grid on the insulating layer 16 and according to the pattern of the conductors (in columns) of the return electrode on the resistive layer 11.
  • Material dimensions and characteristics used to make the resistive elements between the scan lines and the return electrode conductors will be adapted to minimize consumption due to handing over zero scan lines, and for that time to this reset is less than the duration of addressing a line, this time being related to the capacity of the scanning lines.
  • the time required to bring back a line that comes to be addressed to the potential + V1 is around 7 ⁇ s which is perfectly compatible with a line time which is generally around 40 ⁇ s for such a screen.
  • the present invention is capable of various variants and modifications which will appear to the man of art.
  • we can seek to reduce consumption linked to the recall by increasing the space between the lines of sweep and the conductors of the return electrode, and / or etching the resistive layer so as to leave only point recall resistors between lines and conductors of the return electrode.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Cold Cathode And The Manufacture (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
EP98410111A 1997-09-30 1998-09-29 Vereinfachung einer Mikrospitzen-Anzeige mit einer Rücksetzungselektrode Withdrawn EP0905670A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9712392A FR2769114B1 (fr) 1997-09-30 1997-09-30 Simplification de l'adressage d'un ecran a micropointes
FR9712392 1997-09-30

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EP0905670A1 true EP0905670A1 (de) 1999-03-31

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US (1) US6172455B1 (de)
EP (1) EP0905670A1 (de)
JP (1) JPH11191358A (de)
FR (1) FR2769114B1 (de)

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WO2002021493A1 (en) * 2000-09-08 2002-03-14 Motorola, Inc. Field emission display
US6975288B2 (en) 2000-09-22 2005-12-13 Canon Kabushiki Kaisha Method of driving image-forming apparatus and apparatus thereof

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FR2809862B1 (fr) * 2000-05-30 2003-10-17 Pixtech Sa Ecran plat de visualisation a memoire d'adressage
KR20060084501A (ko) * 2005-01-19 2006-07-24 삼성에스디아이 주식회사 전자기장을 이용한 전계방출소자 및 그 구동방법

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FR2733343A1 (fr) * 1995-04-19 1996-10-25 Futaba Denshi Kogyo Kk Procede de commande d'un dispositif d'affichage d'image et son unite

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FR2663462B1 (fr) * 1990-06-13 1992-09-11 Commissariat Energie Atomique Source d'electrons a cathodes emissives a micropointes.
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FR2687841A1 (fr) * 1992-02-21 1993-08-27 Commissariat Energie Atomique Ecran cathodoluminescent comprenant une source matricielle d'electrons.
FR2733343A1 (fr) * 1995-04-19 1996-10-25 Futaba Denshi Kogyo Kk Procede de commande d'un dispositif d'affichage d'image et son unite

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002021493A1 (en) * 2000-09-08 2002-03-14 Motorola, Inc. Field emission display
US6542136B1 (en) 2000-09-08 2003-04-01 Motorola, Inc. Means for reducing crosstalk in a field emission display and structure therefor
US6975288B2 (en) 2000-09-22 2005-12-13 Canon Kabushiki Kaisha Method of driving image-forming apparatus and apparatus thereof

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FR2769114A1 (fr) 1999-04-02
US6172455B1 (en) 2001-01-09
JPH11191358A (ja) 1999-07-13
FR2769114B1 (fr) 1999-12-17

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