EP0844643A1 - Flaches Bildschirm mit seitlicher Ablenkung - Google Patents

Flaches Bildschirm mit seitlicher Ablenkung Download PDF

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Publication number
EP0844643A1
EP0844643A1 EP97410134A EP97410134A EP0844643A1 EP 0844643 A1 EP0844643 A1 EP 0844643A1 EP 97410134 A EP97410134 A EP 97410134A EP 97410134 A EP97410134 A EP 97410134A EP 0844643 A1 EP0844643 A1 EP 0844643A1
Authority
EP
European Patent Office
Prior art keywords
cathode
grid
emissive
anode
elements
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Withdrawn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
EP97410134A
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English (en)
French (fr)
Inventor
Axel Jäger
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.)
Pixtech SA
Original Assignee
Pixtech SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pixtech SA filed Critical Pixtech SA
Publication of EP0844643A1 publication Critical patent/EP0844643A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J3/00—Details of electron-optical or ion-optical arrangements or of ion traps common to two or more basic types of discharge tubes or lamps
    • H01J3/02—Electron guns
    • H01J3/021—Electron guns using a field emission, photo emission, or secondary emission electron source
    • H01J3/022—Electron guns using a field emission, photo emission, or secondary emission electron source with microengineered cathode, e.g. Spindt-type
    • 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 flat screens of display, and more particularly so-called cathodoluminescence screens, whose anode carries luminescent elements likely to be excited by electronic bombardment.
  • This electron bombardment can come from microtips, from layers with low extraction potential or from a thermionic source.
  • Figure 1 partially and schematically the structure of a classic color microtip flat screen type called "switched anode”.
  • 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.
  • the cathode is generally organized in columns and consists, on a glass substrate 10, 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 to inside the meshes defined by the cathode conductors.
  • Figure 1 partially shows the interior of a mesh and cathode conductors do not appear in this figure.
  • the cathode 1 is associated with the grid 3 organized in lines. The intersection of a row in the grid and a column in the cathode defines a pixel.
  • This device uses the electric field created between the cathode 1 and grid 3 so that electrons are extracted microtips 2. These electrons are then attracted by phosphor elements 7 of anode 5 if these are suitably polarized.
  • Anode 5 is provided with alternating strips of elements phosphors 7r, 7g, 7b each corresponding to a color (Red, Green, Blue).
  • the bands are parallel to the columns of the cathode and are separated from each other by an insulator 8.
  • the phosphor elements 7 are deposited on electrodes 9, consisting of corresponding strips of a conductive layer transparent such as indium tin oxide (ITO).
  • the assemblies red, green, blue bands are, in this example, alternately polarized with respect to cathode 1, so that electrons extracts of microtips 2 from a pixel of the cathode / grid are alternately directed towards the phosphor elements 7 corresponding to each of the colors.
  • each column of cathode 1 is subdivided in three sub-columns arranged, respectively, at plumb with the bands of phosphor elements of each color. These sub-columns are addressed sequentially to bombard the phosphor elements associated with each of the colors. Each pixel is divided into three sub-pixels defined by intersections respective grid lines with each of the sub-columns of the cathode.
  • these phosphor elements are, if necessary, deposited according to a pattern defining the pixels with, for each color, a region of phosphor elements of the corresponding color defining the sub-pixel next to the cathode sub-column corresponding.
  • the present invention aims to overcome this drawback by making the emissive power of the microtips substantially constant.
  • the present invention also aims to provide a flat screen with microtip display observable from cathode side.
  • the present invention provides a flat display screen comprising a cathode associated with an electron extraction grid emitted by at least a cathode region, and an anode provided with elements phosphors placed opposite the cathode / grid, the cathode being devoid of emissive region in the areas located plumb with the phosphor elements, these zones comprising a conductive layer polarizable independently of the regions emissive.
  • the screen includes a deflection grid of the electrons emitted by each emissive region of the cathode to at least one region phosphor elements.
  • the conductive layer is polarized at a potential at most equal to a minimal potential for polarization of the emissive regions.
  • the cathode and the extraction grid are supported by a transparent plate constituting the display face of the screen, the conductive layer being made of a transparent material deposited directly on said plate.
  • each emissive region of the cathode is associated with a region phosphor elements, the deflection grid being polarized at a potential lower than a minimum potential for polarization of emissive regions.
  • each emissive region of the cathode is associated with at least two regions of phosphor elements, the polarization potential of the deflection grid being a function of the region of elements phosphors to be excited while being less than a potential minimum polarization of the emissive regions.
  • all regions of phosphor elements of the anode are polarized simultaneously.
  • the anode consists of at least two sets of alternating bands phosphor elements, each set of bands being individually polarized.
  • the cathode is organized in columns, the extraction grid being organized in lines and each intersection of a line of the extraction grid with a cathode column defining an emissive region.
  • the emissive regions are made up of microtips.
  • the present invention originates from an interpretation phenomena that cause the above problems in classic screens.
  • the inventors consider that these problems are due, in particular, to a deposit on the microtips of the cathode of pollutants resulting from ions emitted by the anode.
  • the most negative potential corresponds to the microtips which are, for example, molybdenum (Mo).
  • Mo molybdenum
  • the electronic bombardment phosphor elements leads to an ionic release at the surface of these phosphor elements. These ions are emitted perpendicularly on the surface of the anode and pollute the microtips which are located directly above the phosphor elements bombed.
  • the present invention proposes to shift the microtips relative to the plumb (the perpendicular) of the regions of phosphor elements which they have to bomb.
  • Figure 2 shows a first embodiment a microtip display flat screen according to the present invention. This embodiment applies, more particularly, to a screen in which all the phosphor elements are polarized simultaneously.
  • the anode 5 of the screen is produced on the internal face of a plate 6, for example made of glass.
  • regions, for example bands parallel, phosphor elements corresponding to each of the colors are deposited on a conductive polarization layer, for example, an ITO layer 9 spanning the entire internal surface of the plate 6 corresponding to the useful area of the screen.
  • a cathode 1 ' is, as previously, produced on a plate 10, for example made of glass.
  • the cathode 1 ' is organized in columns and is, for example, consisting of organized cathode conductors (not shown) in mesh from a conductive layer.
  • Microtips 2 are made on a resistive layer 11 deposited on these cathode conductors and are arranged inside the meshes defined by the cathode conductors.
  • This column includes three sub-columns, respectively 12r, 12g and 12b, associated with each of the colors. According to the present invention, each sub-column 12r, 12g or 12b is offset by vertical to the column of phosphors, respectively 7r, 7g or 7b, corresponding while being parallel to it.
  • Cathode 1 ' is associated with an extraction grid 3 electrons, organized in lines.
  • the grid 3 is not only provided with holes 4 corresponding to the locations microtips 2, but also a hole 13 more large diameter at each intersection of a grid line with a strip 7 of phosphor elements of the anode.
  • This hole 13 is intended for the passage of the ions emitted by the phosphor elements of the anode so that they are, according to the invention, collected by a conductive layer 14 deposited between each sub-column of the cathode 1 '.
  • Layer 14 is polarized to a potential at most equal to the most negative potential of microtip polarization (for example 0 volts).
  • Layer 14 is therefore polarizable independently of the microtip polarization conductors, organized in sub-columns 12r, 12g, 12b. Layer 14 is role of preventing a positive charge area from developing between two sub-columns of cathode 1 ', which would risk to cause the formation of electric arcs.
  • a pixel of a screen as shown in Figure 2 consists of three sub-pixels respectively associated with each of colors. Each sub-pixel is defined by the intersection a row of the extraction grid 3 with a sub-column 12r, 12g or 12b of cathode 1 'and a strip, respectively 7r, 7g or 7b, from the 5 'anode.
  • a feature of the present invention is that the cathode 1 'is associated with an additional grid 15 attached over the entire surface of the screen and provided with corresponding holes 16 at the locations of each sub-pixel on the screen.
  • the role of the grid 15 is to laterally repel the electrons emitted by the microtips 2 from a sub-pixel to the strip of phosphor elements of this sub-pixel.
  • Grid 15 is brought to a potential negative chosen, in particular, depending on the amplitude of the desired deviation, i.e. relative positions of cathode sub-columns in relation to the strips of elements anode phosphors.
  • Grid 15 is attached to the assembly cathode / grid being isolated from the extraction grid 3.
  • the lines of grid 3 are provided with a hole 13 plumb with each intersection of a grid line 3 with a strip of phosphor elements the 5 'anode.
  • the grid 15 can, alternatively, be made up of bands parallel to the cathode sub-columns 1 ', a strip of the deflection grid being associated with each sub-column being opposite to this sub-column in relation to the plumb of the strip of elements corresponding phosphors.
  • a grid 15 forming a mesh with an opening 16 to the right of each sub-pixel.
  • the height of the grid 15 is a function, in particular, the inter-electrode distance and the amplitude of the desired deviation for the electrons.
  • the grid 15 has a height of around 50 to 200 ⁇ m while the combined thickness of constituent layers of cathode 1 'and grid 3 deposited on plate 10 represents only on the order of 1 to 5 ⁇ m.
  • the embodiment shown in Figure 2 also applies to a monochrome screen.
  • advantage is taken of the fact that the ions (dotted lines in Figure 2) emitted by the phosphor elements of the anode are more difficult to deflect than the electrons (solid lines in Figure 2) emitted by the microtips 2. So the ions are basically collected by the bands conductive 14.
  • An advantage of the present invention is that by removing a source of pollution of microtips 2, it improves considerably longer screen life.
  • Another advantage of the present invention is that it improves the quality of an unswitched anode screen by avoiding parasitic illumination of phosphor elements corresponding to pixels or to sub-pixels neighboring a pixel considered.
  • the zones (bands) of the deflection grid 15 which are parallel to the bands of phosphor elements prevent electrons intended for a given band of phosphor elements of bombard a neighboring band of phosphors by repelling these electrons to the band for which they are intended.
  • the invention further improves the quality of the screen, in particular high-voltage inter-electrode, providing a focusing effect of electrons towards pixels or sub-pixels for which they are intended.
  • the first embodiment shown in Figure 2 also applies to the case where the bands of elements anode phosphors are alternately polarized color by color (screen with switched anode).
  • deflection grid 15 can be omitted as long as the electrons are attracted to the band of polarized phosphors closest which corresponds to that associated with the sub-column addressed from the cathode, the other two bands framing on both sides the strip of polarized phosphors being at zero potential.
  • Figure 3 shows a second embodiment a microtip display flat screen according to the present invention. This embodiment applies to a color screen.
  • each column of the 1 "cathode is made similar to a sub-column of the embodiment described in relation to FIG. 2.
  • Side 5 anode, three bands of phosphor elements 7r, 7g and 7b are associated with each column 12 of the cathode 1 ".
  • Each column 12 is, according to this embodiment, intended to bombard alternately (for example, according to a display mode carried out by subframes respectively associated with each color) the bands phosphor elements of each color.
  • a pixel is here defined by the intersection of a line in grid 3 with a column 12 of the cathode 1 "and a group of three neighboring bands anode 5 ".
  • Each conductive strip 14 intended to collect the ions emitted by the phosphor elements of the 5 "anode extends, in width, under the three bands 7r, 7g and 7b associated to the corresponding column 12, being polarizable independently of the columns 12.
  • the holes 13 of the grid extraction 3 and the holes 16 of the deflection grid 15 are adapted to the combined width of the three bands 7r, 7g and 7b.
  • the deflection grid 15 is polarized to a different potential for each of the colors depending on the band 7r, 7g or 7b which must be excited.
  • the polarization potential of the gate 15 is chosen, depending of the color, among three values included, for example, between -50 and -200 volts, the potential associated with the strip of elements nearest phosphors being the least negative potential.
  • the strips of phosphor elements 7r, 7g and 7b are deposited on electrodes, respectively 9r, 9g and 9b, consisting of corresponding strips of a conductive layer, for example of ITO, separated from each other by an insulator 8.
  • the sets of red, green, blue bands are alternately polarized with respect to the 1 "cathode.
  • This embodiment however also applies to an anode in which the bands 7r, 7g and 7b are all polarized simultaneously.
  • the modification of the potential of grid 15 depending on the color determines that of bands 7r, 7g or 7b which receives the electrons.
  • the strips of phosphor elements have different widths depending on their position by relative to the emission area. This difference in width compensates for the difference in focusing effect related to the three grid voltages required for color selection. Since the light output of a luminophore depends on the current density received and therefore for a given current of the width of the phosphor strips, differences in width balance an uneven light output between the three colours.
  • the polarization of the elements phosphors of the anode can, whether in the first or in the second embodiment, be provided by a thin metal layer (18, Figure 2), for example, aluminum, deposited on the entire useful surface of the anode and trapping the strips of phosphor elements.
  • a thin metal layer (18, Figure 2), for example, aluminum, deposited on the entire useful surface of the anode and trapping the strips of phosphor elements.
  • High energy (around 2 at 10 keV) electrons allow them to pass through this layer metallization to excite the phosphors.
  • this thin metal layer is usually not enough waterproof to avoid any ionic evolution of the phosphors and the invention remains useful.
  • the bands 7r, 7g and 7b can be replaced with pads of corresponding size to the size of a sub-pixel.
  • Grid 3 is then, the case if necessary, provided with a hole 13 directly above each pellet phosphor elements.
  • An advantage of the present invention is that it allows to simply create a flat screen with a viewing surface is constituted by the plate 10 carrying the cathode 1 '.
  • an observable screen is obtained.
  • the cathode by depositing the strips 14 of collection of ions directly on plate 10 and making these bands in a transparent material, for example, from ITO.
  • the bands 14 are preferably interconnected to be polarized together.
  • the strips 14 are, for example, formed in the same conductive layer that the bias conductors of microtips.
  • the grid 15 is, for example, attached to a layer insulator resting on the cathode / grid assembly.
  • the grid 15 rests in the holes 13 made in the lines of the grid 3 and in the spaces between the lines of grid 3, on an insulating layer 17 in the thickness of which are made the microtips 2.
  • the grid 3 can also be coated with a insulation layer (not shown) open in line with the holes 16 of the grid 15 which then rests on this insulation layer.
  • the practical realization of cathode 1 ', of the extraction grid 3 and the deflection grid 15 is within the reach of man of the profession using known techniques to respect the insulation requirements between the conductive elements.
  • the ion collection layer 14 can be deposited on an insulation layer (not shown), reported on grid layer 3 and open in areas where grid 3 is provided with holes 4. In this case, the layer of grid 3 does not need to be opened by holes 13.
  • Des microtips 2 can, if necessary, be present under the conductive layer 14 according to the pattern according to which they are deposited, but they are then rendered inoperative by the layer insulation which covers the grid 3.
  • microtips can be masked by the grid 15, outside the holes 16 and thus be rendered inoperative. Only the regions of microdots, not masked, which are free to emit electrons up to the phosphor elements constitute regions emissive within the meaning of the present invention.
  • the present invention is capable of various variants and modifications which will appear to the man of art.
  • the polarization potentials of the elements phosphors, microtips, extraction grid and the deviation grid will be chosen according to desired functional characteristics for the screen.
  • the invention also applies to a two-color screen, the pixels are, on the anode side, made up of regions of elements phosphors of two different colors.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
EP97410134A 1996-11-22 1997-11-21 Flaches Bildschirm mit seitlicher Ablenkung Withdrawn EP0844643A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9614616A FR2756418A1 (fr) 1996-11-22 1996-11-22 Ecran plat de visualisation a deviation laterale
FR9614616 1996-11-22

Publications (1)

Publication Number Publication Date
EP0844643A1 true EP0844643A1 (de) 1998-05-27

Family

ID=9498139

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Application Number Title Priority Date Filing Date
EP97410134A Withdrawn EP0844643A1 (de) 1996-11-22 1997-11-21 Flaches Bildschirm mit seitlicher Ablenkung

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US (1) US5998923A (de)
EP (1) EP0844643A1 (de)
JP (1) JPH10321166A (de)
FR (1) FR2756418A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6414428B1 (en) 1998-07-07 2002-07-02 Candescent Technologies Corporation Flat-panel display with intensity control to reduce light-centroid shifting
US6225761B1 (en) 1999-09-27 2001-05-01 Motorola, Inc. Field emission display having an offset phosphor and method for the operation thereof
KR100689558B1 (ko) * 2000-12-23 2007-03-09 엘지전자 주식회사 전계방출소자의 전극구조
US6879097B2 (en) * 2001-09-28 2005-04-12 Candescent Technologies Corporation Flat-panel display containing electron-emissive regions of non-uniform spacing or/and multi-part lateral configuration
US7414347B2 (en) * 2004-03-23 2008-08-19 Emerson Electric Co. End cap for segmented stator

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2682211A1 (fr) * 1991-10-03 1993-04-09 Futaba Denshi Kogyo Kk Dispositif d'affichage fluorescent de type plat.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06310061A (ja) * 1993-02-26 1994-11-04 Sony Corp 表示装置
JPH07105831A (ja) * 1993-09-20 1995-04-21 Hewlett Packard Co <Hp> 電子集束及び偏向のための装置と方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2682211A1 (fr) * 1991-10-03 1993-04-09 Futaba Denshi Kogyo Kk Dispositif d'affichage fluorescent de type plat.

Also Published As

Publication number Publication date
JPH10321166A (ja) 1998-12-04
FR2756418A1 (fr) 1998-05-29
US5998923A (en) 1999-12-07

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