EP0806790A1 - Mikrospitzen-Farbbildschirm mit zwei Gittern - Google Patents

Mikrospitzen-Farbbildschirm mit zwei Gittern Download PDF

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Publication number
EP0806790A1
EP0806790A1 EP97410051A EP97410051A EP0806790A1 EP 0806790 A1 EP0806790 A1 EP 0806790A1 EP 97410051 A EP97410051 A EP 97410051A EP 97410051 A EP97410051 A EP 97410051A EP 0806790 A1 EP0806790 A1 EP 0806790A1
Authority
EP
European Patent Office
Prior art keywords
grid
slots
potential
cathode
strips
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.)
Granted
Application number
EP97410051A
Other languages
English (en)
French (fr)
Other versions
EP0806790B1 (de
Inventor
Jean-Luc Grand-Clement
Bernard Bancal
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 EP0806790A1 publication Critical patent/EP0806790A1/de
Application granted granted Critical
Publication of EP0806790B1 publication Critical patent/EP0806790B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 microtip display flat screens.
  • the cathode is made up of a very large number of microtips connected in columns, each of which can be addressed individually.
  • the ends of these microtips open into openings in an insulated grid.
  • This grid is divided into rows orthogonal to the columns, individually addressable.
  • An anode is located opposite the cathode / grid assembly and is separated from it by an empty space.
  • a group of three red, green and blue bands is approximately the width of a cathode column. All the bands of phosphors of the same color are interconnected so that it is possible to selectively address all the red bands, all the green bands or all the blue bands.
  • a complete image addressing cycle (a frame) comprises the step of addressing all the anode bands of the same kind, for example all the red bands and, while these red bands are at high voltage, to address each of the grid gnaws sequentially. During each polarization of a row of grid, all the cathode columns are addressed to potentials chosen to obtain a desired luminescence of each of the red pixels. The operation is then repeated for the green bands and the blue bands and one thus obtains a line by line and color by color addressing (sub-frame by sub-frame) of a complete frame.
  • This addressing mode requires switching of the potentials on the anodes.
  • the anode potential is generally a high potential for the energy of the electrons sent by the cathodes to cause sufficient illumination of the phosphors.
  • anode potentials of the order of 150 volts are indicated.
  • conventionally potentials of the order of 600 to 1000 volts are used and we would like to be able to use even higher potentials.
  • the need to switch the high anode potentials is a drawback.
  • An object of the present invention is to provide a new flat color microtip screen structure and a new method of addressing this screen such that it avoids switching high potentials.
  • the present invention provides a color microtip flat screen comprising a microtip cathode divided into independently addressable columns; a first pixel selection grid divided into independently addressable rows; a second color selection grid comprising a plurality of groups of slots extending in the direction of the columns, each group of three slots, corresponding to a column of the cathode, slots of the same rank from each group being connected to the same terminal; and an anode comprising groups of three parallel strips in a column of luminescent material of three chosen colors, a group of three strips corresponding to a column of the cathode, each strip corresponding to one of said slots, all the strips of luminescent material being brought into operation at the same potential.
  • the second grid is formed by cutting a thin metal sheet to form said slots and stiffening spacers, one strip out of three being delimited by the facing edges of said cut metal sheet , the other two strips out of three being formed by the facing edges of conductive layers deposited on an insulating layer itself formed on said sheet.
  • the above screen control method comprises the steps of bringing the anodes to a high anode potential, bringing the metallizations of the slots of the second grid corresponding to a first color to a validation potential and the other metallizations corresponding to the other two colors at a blocking potential, sequentially bring all the rows of the first grid to an addressing potential, when addressing each row of the first grid, polarize the cathode columns to a potential chosen for obtain a desired luminescence of the pixels of the selected color of said row, repeat the operation for the other two colors, and repeat all of the operations for the following frames.
  • An advantage of the present invention is that it leads to switching only the potentials of a cathode, of a first grid and of a second grid, which are all potentials of small values compared to that of the anode. As a result, the switching times can be shorter and the switching components simpler.
  • the cathode and lower grid assembly of a screen according to the present invention is identical to conventional embodiments such as that described in the aforementioned US patent.
  • This assembly is produced on an insulating substrate 1, for example a glass plate.
  • Microtips 2 are formed on columns of cathode conductors K1, K2, K3 ... Rows of gate conductors L1, L2, L3 ... are formed on an insulating layer covering the cathode conductors.
  • the ends of the microtips opening out substantially at the level of the upper parts of the grid openings.
  • this representation is very schematic and many known variants can be used, in particular, means for forming a resistor between each microtip and the associated cathode conductor.
  • the anode is similar to conventional anodes. Opposite each cathode column K, three strips of luminescent material R, G, B are arranged, also extending along columns. A difference compared to the state of the art is that these various bands, instead of being interconnected by bands of the same nature (the red bands, the green bands, the blue bands) are all brought to the same anode potential. during screen operation. For this, all the phosphor strips can for example be formed on the same layer conductive 6 formed on a substrate 7. In general, the layer 6 and the substrate 7 will be made of transparent materials, for example respectively a conductive layer of indium tin oxide (ITO) and a glass plate.
  • ITO indium tin oxide
  • the screen according to the present invention comprises a second grid provided with slots extending in the direction of the columns whose width dimensions correspond substantially to those of the strips of anode phosphors and respectively designated by the references A1R, A1G, A1B; A2R, A2G, A2B; A3R, A3G, A3B ...
  • each slot corresponds to a band of phosphor and we will speak below, for the sake of simplicity of "red slot”, “green slot”, “blue slot”.
  • this second grid was formed of an insulating material and that the internal edges of each of the slots were coated with a lateral metallization M1R, M1G, M1B; M2R, M2G, M2B; M3R, M3G, M3B ...
  • the lateral metallizations corresponding to slots associated with the same color are connected to the same terminal (not shown), that is to say that the metallizations M1R, M2R, M3R ... are connected to the same terminal as well as the metallizations M1G, M2G, M3G ... and M1B, M2B, M3B ...
  • spacers 9 have also been shown for the second grid. These spacers, which serve to ensure the mechanical strength of the grid, have no functional role and are not necessarily arranged in the regular manner shown.
  • isolation and spacing means are provided between the second grid and the upper face of the first grid, and between the second grid and the lower face of the anode. Many embodiments can be imagined by those skilled in the art for the production of these isolation means and these spacers.
  • the addressing mode of this device will be substantially the same as that described in the aforementioned American patent. except that, instead of switching the strips of anode phosphors, the lateral metallizations of the slots of the second grid are switched.
  • the advantage of the present invention emerges from an analysis of typical values of the potentials to be applied to the various electrodes of the screen.
  • red pixels corresponding to row L2 of the first grid This row L2 will be placed at a potential of the order of 80 volts, the other rows L1, L3 ... being grounded.
  • the columns K1, K2, K3 ... will be at potentials of the order of 0 to 30 volts depending on the desired brightness of the pixels considered.
  • the metallizations MR (M1R, M2R, M3R %) of the red slits of the second grid will be placed at a potential of +10 V compared to the mass to let pass the electrons emitted by the subjacent points towards the red phosphors .
  • the MG and MB metallizations of the green and blue slits will be placed at a potential of -10 V relative to the mass to block the electrons which would normally be directed through them towards the green and blue phosphors.
  • this second grid has not only a shutter function but also a focusing function. We are therefore assured that, when the "red slots" of the second grid are validated, only red phosphors will be bombarded. This focusing effect will be optimized by adjusting the color selection potential applied to the slots of the second grid.
  • Another advantage of the present invention is that, since there is no longer any need to switch the anode, it can be placed at a very high potential, for example several thousand of volts so that the energy of the electrons will be much higher and will produce better illumination of the phosphors.
  • these phosphors can then be coated on the side of their internal face with a thin conductive layer, for example a thin layer of aluminum which, in known manner, provides numerous advantages, in particular for avoiding parasitic lighting phenomena. .
  • an additional advantage of the present invention is that it makes it possible to use cathode and first grid systems identical to those already manufactured in the prior art and therefore requires only one modification (a simplification) of the anode structure and the realization of an additional grid.
  • isolation structures and spacers to be placed between the additional grid and the plates.
  • anode on the one hand and cathode / grid on the other.
  • These isolation and spacing systems may consist of spacing balls or perforated spacing plates.
  • FIG. 2 represents an exemplary embodiment according to the present invention of a second grid.
  • This grid is formed from a metal sheet 10 stamped to define the slots AR, AG, AB (only portions of the slots A2R, A2G, A2B, A3R, A3G are shown) and stiffening spacers 9.
  • the slots AG are directly delimited by facing edges of the metal sheet 10.
  • the slots AR and AB are defined by the facing edges of conductive layers 11 formed on an insulating layer 12 deposited on the metal sheet. The deposition and delimitation of these insulating and conductive layers can be carried out in a conventional manner. It is clear that all the metallizations of the AG slots have the same potential (that of the metal foil). Similarly, the metallizations of each of the slots AB and the metallizations of each of the slots AR will be brought to the same potential.
  • one of the three electrodes of the second grid is made of the material of a metal sheet makes it particularly simple to interconnect the two other groups of metallizations of this grid which could, for example, be connected by metallized and insulated strips arranged at opposite ends of the metallizations of the slots.
  • Another advantage of producing the second grid from a stamped conductive plate is that such a conductive plate can be very thin while having good mechanical strength. Its thickness may for example be of the order of 1 to 5 tenths of a millimeter and the metal which constitutes it will be for example aluminum, copper, stainless steel, nickel, an aluminum alloy.
  • a grid according to the present invention could be used with a screen whose diagonal dimension is of the order of a meter, the dimensions of a pixel being of the order of a millimeter.
  • the grid pitch will then be of the order of 0.15 mm, the distance between groups of three slots being of the order of 0.25 mm.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
EP97410051A 1996-05-06 1997-05-02 Mikrospitzen-Farbbildschirm mit zwei Gittern Expired - Lifetime EP0806790B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9605934A FR2748348B1 (fr) 1996-05-06 1996-05-06 Ecran couleur a micropointes a double grille
FR9605934 1996-05-06

Publications (2)

Publication Number Publication Date
EP0806790A1 true EP0806790A1 (de) 1997-11-12
EP0806790B1 EP0806790B1 (de) 2003-02-19

Family

ID=9492082

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97410051A Expired - Lifetime EP0806790B1 (de) 1996-05-06 1997-05-02 Mikrospitzen-Farbbildschirm mit zwei Gittern

Country Status (5)

Country Link
US (1) US6034658A (de)
EP (1) EP0806790B1 (de)
JP (1) JPH1055771A (de)
DE (1) DE69719110T2 (de)
FR (1) FR2748348B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0854493A1 (de) * 1997-01-16 1998-07-22 International Business Machines Corporation Kathode für eine Bildanzeigevorrichtung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100463190B1 (ko) 2002-06-12 2004-12-23 삼성에스디아이 주식회사 금속 메쉬 일체형 스페이서 구조체 및 이 구조체를 갖는평판 표시 소자

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63150837A (ja) * 1986-12-16 1988-06-23 Canon Inc 電子放出装置
EP0404022A2 (de) * 1989-06-19 1990-12-27 Matsushita Electric Industrial Co., Ltd. Flache Bildwiedergabevorrichtung und Verfahren zur Herstellung derselben
WO1993021650A1 (en) * 1992-04-10 1993-10-28 Silicon Video Corporation Self supporting flat video display
JPH06139918A (ja) * 1992-10-23 1994-05-20 Shimadzu Corp 電子放出素子
EP0660368A1 (de) * 1993-12-22 1995-06-28 Gec-Marconi Limited Feldemissionselektronenvorrichtung
WO1995020821A1 (en) * 1994-01-31 1995-08-03 Silicon Video Corporation Field emitter with focusing ridges

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69026353T2 (de) * 1989-12-19 1996-11-14 Matsushita Electric Ind Co Ltd Feldemissionsvorrichtung und Verfahren zur Herstellung derselben
US5150067A (en) * 1990-04-16 1992-09-22 Mcmillan Michael R Electromagnetic pulse generator using an electron beam produced with an electron multiplier
DE69323485T2 (de) * 1992-11-06 1999-07-22 Mitsubishi Denki K.K., Tokio/Tokyo Bildwiedergabeanordnung
US5650690A (en) * 1994-11-21 1997-07-22 Candescent Technologies, Inc. Backplate of field emission device with self aligned focus structure and spacer wall locators
FR2732159B1 (fr) * 1995-03-22 1997-06-13 Pixtech Sa Ecran plat de visualisation a double grille
US5760858A (en) * 1995-04-21 1998-06-02 Texas Instruments Incorporated Field emission device panel backlight for liquid crystal displays

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63150837A (ja) * 1986-12-16 1988-06-23 Canon Inc 電子放出装置
EP0404022A2 (de) * 1989-06-19 1990-12-27 Matsushita Electric Industrial Co., Ltd. Flache Bildwiedergabevorrichtung und Verfahren zur Herstellung derselben
WO1993021650A1 (en) * 1992-04-10 1993-10-28 Silicon Video Corporation Self supporting flat video display
JPH06139918A (ja) * 1992-10-23 1994-05-20 Shimadzu Corp 電子放出素子
EP0660368A1 (de) * 1993-12-22 1995-06-28 Gec-Marconi Limited Feldemissionselektronenvorrichtung
WO1995020821A1 (en) * 1994-01-31 1995-08-03 Silicon Video Corporation Field emitter with focusing ridges

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 412 (E - 676) 31 October 1988 (1988-10-31) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 434 (E - 1592) 12 August 1994 (1994-08-12) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0854493A1 (de) * 1997-01-16 1998-07-22 International Business Machines Corporation Kathode für eine Bildanzeigevorrichtung
US5889372A (en) * 1997-01-16 1999-03-30 International Business Machines Corporation Device cathode with extractor grid for display

Also Published As

Publication number Publication date
JPH1055771A (ja) 1998-02-24
DE69719110D1 (de) 2003-03-27
FR2748348B1 (fr) 1998-07-24
DE69719110T2 (de) 2003-10-09
EP0806790B1 (de) 2003-02-19
FR2748348A1 (fr) 1997-11-07
US6034658A (en) 2000-03-07

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