EP0844642A1 - Flaches Bildschirm mit fokussierenden Gittern - Google Patents

Flaches Bildschirm mit fokussierenden Gittern Download PDF

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Publication number
EP0844642A1
EP0844642A1 EP97410133A EP97410133A EP0844642A1 EP 0844642 A1 EP0844642 A1 EP 0844642A1 EP 97410133 A EP97410133 A EP 97410133A EP 97410133 A EP97410133 A EP 97410133A EP 0844642 A1 EP0844642 A1 EP 0844642A1
Authority
EP
European Patent Office
Prior art keywords
grid
additional
grids
color
orifices
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Withdrawn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
EP97410133A
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English (en)
French (fr)
Inventor
Jean-Luc Grand-Clément
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 EP0844642A1 publication Critical patent/EP0844642A1/de
Withdrawn legal-status Critical Current

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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 a flat display screen color, and more specifically "to cathodoluminescence ", whose anode carries luminescent elements likely to be excited by electronic bombardment.
  • This electronic bombardment can come from microtips, from layers with low extraction potential or from a thermionic source.
  • Figure 1 shows, very schematically, the structure classic color microtip flat screen of the so-called type "with 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 / grid is placed opposite a cathodoluminescent anode 5 from which it is separated by a vacuum space 12 and of which a glass substrate 6 constitutes the screen surface.
  • Cathode 1 is organized in columns and is made up, on a glass substrate 10, cathode conductors organized in mesh from a conductive layer.
  • the microtips 2 are made on a resistive layer 11 deposited on the cathode conductors and are arranged inside meshes defined by the cathode conductors.
  • Figure 1 partially represents the interior of a mesh and the conductors cathode do not appear in this figure.
  • Cathode 1 is associated with grid 3 organized in lines. The intersection a row of grid 3 and a column of cathode 1 defines a pixel.
  • Anode 5 is generally provided with alternating bands phosphor elements 7r, 7g, 7b each corresponding to a color (Red, Green, Blue).
  • the bands are parallel to the cathode columns 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 layer transparent conductor such as indium tin oxide (ITO).
  • ITO indium tin oxide
  • the sets of red, green, blue bands are alternately polarized with respect to cathode 1, so that electrons extracted from microtips 2 of a pixel by the field electric created between cathode 1 and grid 3 are alternately attracted by the phosphor elements 7 of each of the colors.
  • anode-cathode voltage and therefore the distance anode-cathode defined by space 12.
  • non-switched anode screens of which the anode is made up phosphor elements of different colors, all polarized simultaneously with the same potential.
  • this type of screen the selection of the color of the phosphor element to be excited is obtained, cathode side, by subdividing each column of the cathode into three sub-columns respectively associated with each of the colors.
  • the second stray light problem subsists. This phenomenon is even more critical here because the electrons also bombard phosphor elements from another color.
  • the present invention aims to overcome the drawbacks classic screens by offering a color flat screen of unswitched anode display capable of withstanding high inter-electrode voltage (of the order of 2 to 10 keV) without harming the definition of the screen.
  • the present invention also aims to provide such a high-voltage inter-electrode flat screen that does not require to switch the cathode conductors according to the color to display.
  • the present invention provides a flat color display screen with a cathode associated with an electron extraction grid; a anode provided with at least two types of phosphor elements, all polarized at the same potential; and at least two additional grids superimposed, reported on the extraction grid, isolated from each other and from the extraction grid, and provided with coaxial orifices defining associated sub-pixels each color, each additional grid being associated one color and having holes, smaller diameter than the coaxial orifices of the other additional grids, to activate the sub-pixels of the corresponding color.
  • each additional grid has two sets of different diameters, the diameter of the smaller holes diameter of each additional grid being less than diameter of the larger diameter orifices of the other grids additional.
  • each additional grid consists of a metal sheet perforated.
  • this screen includes means for individually polarizing the additional grids.
  • the present invention also provides a method of control of a flat color display screen consisting of sequentially polarize each additional grid to a respective activation potential of the color sub-pixels corresponding, the other additional grids being brought to respective inhibitory potentials of the sub-pixels of the corresponding colors.
  • the respective activation potentials of the additional grids are positive or zero, their respective inhibition potentials being less than a minimum potential for polarization of the cathode.
  • the activation potential of each additional grid is chosen according to the diameter of its smallest holes diameter.
  • the activation potential of each additional grid is chosen according to the distance between this grid additional extraction grid.
  • the respective inhibition potentials of the additional grids are the same.
  • the polarization potential of the phosphor elements of the anode is between 2 and 10 keV.
  • FIG. 2 is a sectional view of an embodiment of a microtip screen according to the present invention.
  • this screen includes a cathode 1 to microtips 2 and an extraction grid 3 provided with holes 4 corresponding to the locations of the microtips 2.
  • a mesh of cathode conductors organized in columns is carried out on a glass substrate 10.
  • the microtips 2 rest on a layer resistive formed on and between the cathode conductors and are arranged inside the meshes defined by the conductors cathode.
  • the resistive layer and the conductors of cathode of a column have been designated globally by the reference 13.
  • Grid 3 is, as before, organized in lines. The intersection of a line in grid 3 and a column 13 of cathode 1 defines a pixel.
  • the cathode / grid is associated with a 5 'anode made up of regions (for example, parallel strips alternating as in FIG. 1) of phosphor elements 7r, 7g and 7b deposited on a common electrode 9 consisting of a plane a transparent conductive layer such as oxide indium and tin (ITO). Layer 9 is deposited on a glass substrate 6 constituting the surface of the screen. So, all the phosphor elements 7 are simultaneously polarized by compared to cathode 1.
  • a 5 'anode made up of regions (for example, parallel strips alternating as in FIG. 1) of phosphor elements 7r, 7g and 7b deposited on a common electrode 9 consisting of a plane a transparent conductive layer such as oxide indium and tin (ITO). Layer 9 is deposited on a glass substrate 6 constituting the surface of the screen. So, all the phosphor elements 7 are simultaneously polarized by compared to cathode 1.
  • a characteristic of a screen according to the present invention is that it includes, on the cathode side, a grid structure additional 14 focusing electrons emitted by microtips to regions of phosphor elements 7 similarly color.
  • the structure 14 is, in this embodiment, consisting of three focusing grids 15, 16 and 17, respectively associated with each of the colors. We will speak below of “red”, “green” and “blue” grids. Grids 15, 16 and 17 are reported on the extraction grid 3 and are separated the from each other and from the grid 3 by an insulator 18.
  • Each screen pixel (defined by the intersection of a row of grid 3 with a column 13 of cathode 1) is subdivided into three sub-pixels, respectively Pr, Pg and Pb, defined by three coaxial orifices made in the grids 15, 16 and 17.
  • Each sub-pixel of the cathode / grids Pr, Pg, Pb is next to a region of phosphor elements, respectively 7r, 7g or 7b corresponding to the sub-pixel of the color considered, anode side 5 '.
  • phosphor elements respectively 7r, 7g or 7b corresponding to the sub-pixel of the color considered, anode side 5 '.
  • microtips are, in practice, among the number of several thousand per pixel of screen.
  • each "red” grid 15, “green” 16 or “blue” 17 has holes, respectively 19, 21 or 23, activation or inhibition of color sub-pixels corresponding.
  • the holes 19, 21 or 23 of each grid 15, 16 or 17 are of reduced diameter compared to the orifices coaxial, respectively 22 and 24, 20 and 24, or 20 and 22, two other grids.
  • the role of orifices 19, 21 and 23 in diameter reduced is to allow, depending on the polarization of the grids 15, 16 and 17, either to block or to focus the electrons emitted by the microtips 2 opposite the orifices 19, 21 and 23 depending on the color to be displayed.
  • the grids 15, 16 and 17 comprise, each, two series of orifices, respectively 19 and 20, 21 and 22, or 23 and 24, of different diameters.
  • FIGS. 3A to 3C illustrate the operation of a screen according to the invention.
  • Figures 3A, 3B and 3C show schematically an example of polarization of additional grids 15, 16 and 17 of a screen according to the invention, respectively, for each of the three colors.
  • the details of the cathode 1 and the extraction grid 3 have not been reproduced in FIGS. 3A to 3C.
  • the display is made by sub-frames associated with each color.
  • the rows of grid 3 are sequentially polarized at a potential of the order of 80 volts, while the columns 13 of the cathode 1 are brought to respective potentials between a maximum emission potential and a potential for no emissions (for example, respectively 0 and 30 volts).
  • the 5 ′ anode is polarized at a high potential (for example, of the order of 2 to 10 keV).
  • the "red" grid 15 is polarized at a potential positive activation (for example, +30 volts), while the "green” 16 and “blue” 17 grids are polarized to a potential more negative inhibition than the minimum polarization potential columns 13 of cathode 1 (for example, -30 volts).
  • the electrons emitted opposite the orifices 19, along the grid line 3 polarized are focused by the grid "red” 15 to bombard phosphor elements 7r of the sub-pixels correspondents.
  • the electrons emitted opposite orifices 21 and 23 are blocked by the negative potential of polarization of the "green” 16 and "blue” 17 grids and are then collected by the extraction grid 3 at a potential of 80 volts.
  • the value of the activation potential of the grid 15, 16 or 17 to focus the electrons depends, in particular, on the distance of this grid from the extraction grid 3, as well as the diameter of its reduced diameter orifices, 19, 21 or 23 respectively.
  • the activation potential of the grid furthest from grid 3 (here, the "red” grid 15) is the most positive and the activation potential of the grid closest to cathode 1 (here, the "blue” grid 17) is the least positive, even zero.
  • the negative inhibition potentials two additional grids, used to block the electrons from sub-pixels not matching the color at display may be different from each other.
  • the orifice of diameter reduced by a sub-pixel given either to a negative potential to block the electrons the choice of a unique negative inhibition potential allows simplify the control of the structure 14 by means of a circuit screen control electronics.
  • the reduced diameter of the openings 19, 21 or 23 of each grid, respectively 15, 16 or 17, is chosen according to the inter-electrode distance (therefore, inter-electrode voltage) to focus the electrons on the regions phosphor elements associated with the corresponding orifices.
  • the orifices 19, 21 and 23 have a shape chosen to optimize focusing and blocking electrons according to their polarization.
  • the edges can be straight, rounded, pointed, or bevelled towards the anode or the cathode.
  • the diameters of the orifices 19, 21 and 23 can be different from each other, provided that these diameters are, respectively, smaller than the diameters of the orifices (22 and 24, 20 and 24, 20 and 22) of the other grids (16 and 17, 15 and 17, 15 and 16) with which they are coaxial.
  • the thickness of the additional grids 15, 16 and 17 is very much greater than the thickness of the constituent layers of cathode 1 associated with extraction grid 3.
  • the overall thickness of the associated cathode 1 at grid 3 is of the order of 1 to 5 ⁇ m, for example 3.5 ⁇ m, and the thickness of each additional grid 15, 16 or 17 is around 50 ⁇ m.
  • An advantage of the present invention is that it allows to produce a high-voltage inter-electrode display screen without the need for switching components high voltage, the selection of the color to be displayed being performed by the structure 14 of additional grids at low voltage.
  • Another advantage of the present invention is that it guarantees optimal focusing of electrons towards the sub-pixels of the corresponding color.
  • the columns 13 of cathode 1 can be subdivided into addressed sub-columns independently of each other. In this case, selecting the color is carried out by means of the cathode sub-columns.
  • the structure 14 of additional grids then has the role of guarantee optimal focusing of electrons and allow a high inter-electrode voltage.
  • Another advantage of the present invention is that allowing the polarization of the anode under a high voltage, we can now use phosphor elements like those used in color television cathode ray tubes including the manufacturing techniques are perfectly mastered.
  • Another advantage of the present invention is that allowing the production of an anode whose phosphor elements are all polarized simultaneously, the alternating bands phosphor elements conventionally used in screens with microtips can be replaced with element pellets phosphors of each color corresponding to each sub-pixel.
  • Figure 4 is a top view of a structure of additional grids according to the present invention intended for be associated with an anode carrying three pellets of elements phosphors of different colors for each pixel.
  • the holes 19 to 23 of the structure 14 are then arranged, for each pixel defined by the intersection of a line 25 of grid 3 and a column 13 of cathode 1, in depending on the arrangement, on the anode side, of the element pellets phosphors (not shown).
  • the sub-pixels of a given pixel are arranged substantially triangular, which helps balance the bulk of each pixel in both directions.
  • the distribution of sub-pixels must remain consistent with the organization in columns or in sub-columns of the cathode.
  • the invention also applies in case the anode is provided with two different types phosphor elements, for example, to a two-color screen, the phosphor elements are distributed by pellets of the size of a sub-pixel or in strips the width of a sub-pixel. In this case, only two additional grids according to the invention are provided.
  • each additional grid 15, 16, 17 consists of a perforated metal sheet isolated on at least one of its faces. These sheets are assembled so as to align their openings then are arranged on the extraction grid of the plate screen cathode. Then an anode plate is mounted on the upper grid with interposition of spacers. Nevertheless many variant embodiments will appear to the man of art.
  • the present invention is capable of various variants and modifications which will appear to the man of art.
  • shape and diameter of the orifices of the additional grids as well as the respective potentials activation and inhibition of additional grids will chosen to optimize the focusing towards the sub-pixels correspondents.
EP97410133A 1996-11-22 1997-11-21 Flaches Bildschirm mit fokussierenden Gittern Withdrawn EP0844642A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9614615A FR2756417A1 (fr) 1996-11-22 1996-11-22 Ecran plat de visualisation a grilles focalisatrices
FR9614615 1996-11-22

Publications (1)

Publication Number Publication Date
EP0844642A1 true EP0844642A1 (de) 1998-05-27

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EP97410133A Withdrawn EP0844642A1 (de) 1996-11-22 1997-11-21 Flaches Bildschirm mit fokussierenden Gittern

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US (1) US6121725A (de)
EP (1) EP0844642A1 (de)
JP (1) JPH10326582A (de)
FR (1) FR2756417A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1057198A1 (de) * 1998-01-30 2000-12-06 SI Diamond Technology, Inc. Feldemissionskathodestrahlröhre mit steuer- und fokussierungselektroden und horizontal- und vertikalablenkungen

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4169496B2 (ja) * 2001-07-05 2008-10-22 松下電器産業株式会社 受像管装置
US6995502B2 (en) * 2002-02-04 2006-02-07 Innosys, Inc. Solid state vacuum devices and method for making the same
US7301549B2 (en) * 2003-10-30 2007-11-27 Hewlett-Packard Development Company, L.P. Generating and displaying spatially offset sub-frames on a diamond grid
TWI295068B (en) * 2005-11-17 2008-03-21 Tatung Co Ltd Field emission display device

Citations (5)

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Publication number Priority date Publication date Assignee Title
EP0404022A2 (de) * 1989-06-19 1990-12-27 Matsushita Electric Industrial Co., Ltd. Flache Bildwiedergabevorrichtung und Verfahren zur Herstellung derselben
EP0545621A1 (de) * 1991-11-29 1993-06-09 Motorola, Inc. Herstellungsverfahren einer Feldemissionsvorrichtung mit integraler elektrostatischer Linsenanordnung
JPH05290767A (ja) * 1992-04-09 1993-11-05 Nippon Steel Corp フラットディスプレイ用発光体の発光色制御装置
EP0614209A1 (de) * 1993-03-01 1994-09-07 Hewlett-Packard Company Flache Bildschirmanordnung
FR2737041A1 (fr) * 1995-07-07 1997-01-24 Nec Corp Canon a electrons pourvu d'une cathode froide a emission de champ

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US5229691A (en) * 1991-02-25 1993-07-20 Panocorp Display Systems Electronic fluorescent display
US5424605A (en) * 1992-04-10 1995-06-13 Silicon Video Corporation Self supporting flat video display

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0404022A2 (de) * 1989-06-19 1990-12-27 Matsushita Electric Industrial Co., Ltd. Flache Bildwiedergabevorrichtung und Verfahren zur Herstellung derselben
EP0545621A1 (de) * 1991-11-29 1993-06-09 Motorola, Inc. Herstellungsverfahren einer Feldemissionsvorrichtung mit integraler elektrostatischer Linsenanordnung
JPH05290767A (ja) * 1992-04-09 1993-11-05 Nippon Steel Corp フラットディスプレイ用発光体の発光色制御装置
EP0614209A1 (de) * 1993-03-01 1994-09-07 Hewlett-Packard Company Flache Bildschirmanordnung
FR2737041A1 (fr) * 1995-07-07 1997-01-24 Nec Corp Canon a electrons pourvu d'une cathode froide a emission de champ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 018, no. 073 (E - 1503) 7 February 1994 (1994-02-07) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1057198A1 (de) * 1998-01-30 2000-12-06 SI Diamond Technology, Inc. Feldemissionskathodestrahlröhre mit steuer- und fokussierungselektroden und horizontal- und vertikalablenkungen
EP1057198A4 (de) * 1998-01-30 2002-01-30 Si Diamond Techn Inc Feldemissionskathodestrahlröhre mit steuer- und fokussierungselektroden und horizontal- und vertikalablenkungen
US6411020B1 (en) 1998-01-30 2002-06-25 Si Diamond Technology, Inc. Flat CRT display
US6441543B1 (en) 1998-01-30 2002-08-27 Si Diamond Technology, Inc. Flat CRT display that includes a focus electrode as well as multiple anode and deflector electrodes
US6635986B2 (en) 1998-01-30 2003-10-21 Si Diamond Technology, Inc. Flat CRT display
US6958576B2 (en) 1998-01-30 2005-10-25 Si Diamond Technology, Inc. Method of operating a flat CRT display

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Publication number Publication date
FR2756417A1 (fr) 1998-05-29
JPH10326582A (ja) 1998-12-08
US6121725A (en) 2000-09-19

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