EP0738420A1 - Method and installation for assembling a flat display - Google Patents
Method and installation for assembling a flat displayInfo
- Publication number
- EP0738420A1 EP0738420A1 EP95901474A EP95901474A EP0738420A1 EP 0738420 A1 EP0738420 A1 EP 0738420A1 EP 95901474 A EP95901474 A EP 95901474A EP 95901474 A EP95901474 A EP 95901474A EP 0738420 A1 EP0738420 A1 EP 0738420A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plates
- plate
- assembly method
- anode
- screen
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
- H01J9/26—Sealing together parts of vessels
- H01J9/261—Sealing together parts of vessels the vessel being for a flat panel display
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/46—Machines having sequentially arranged operating stations
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2209/00—Apparatus and processes for manufacture of discharge tubes
- H01J2209/38—Control of maintenance of pressure in the vessel
- H01J2209/389—Degassing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2329/00—Electron emission display panels, e.g. field emission display panels
Definitions
- the present invention relates to a flat display screen. It applies more particularly to the assembly of the two plates respectively constituting the bottom and the surface of the screen, and between which is formed an internal space isolated from the outside.
- a flat screen consists of two generally rectangular external plates, for example made of glass. One plate constitutes the surface of the screen while the other constitutes the bottom of the screen generally provided with emission means. These two plates are assembled by means of a sealing joint, being spaced from each other.
- FED field effect screen
- VFD fluorescent vacuum display
- a vacuum is created in the space separating the two glass plates, while for a plasma screen, this space is filled with low pressure gas.
- FIG. 1 shows schematically and in section the conventional structure of a portion of a microtip screen and Figure 2 illustrates schematically and in section a conventional method of assembling a microtip screen.
- a microtip screen is essentially made up of a cathode plate 1 placed opposite an anode plate 2.
- This device uses the electric field created between the cathode 3 and the grid 5 so that electrons are extracted from the microtips 7 towards phosphor elements 8 suitably polarized from the anode plate 2 by crossing an empty space 11.
- the cathode / grid and the anode are produced separately on the two substrates 3 and 10 to form the cathode 1 and anode 2 plates, then these plates are assembled by means of a peripheral sealing joint 12 (FIG. 2).
- a empty space 11 is provided between the two plates 1 and 2 to allow the circulation of electrons from the cathode to the anode.
- a similar treatment is applied to the anode plate 2, but here in an oxygen-rich atmosphere.
- the purpose of this treatment is to cause evaporation of the residual organic components remaining in the lumino ⁇ phore elements 8 on the anode after having served as promoters used in the various methods of depositing the phosphors or constituting contaminants resulting from the treatment stages. later.
- a pumping tube 13 is then placed on the free face of the cathode plate 1.
- This tube is for example made of glass and is sealed by one of its open ends in line with a hole made in the plate 1 to establish a communication with space 11.
- This tube 13 will be used in particular subsequently to connect a pipe 14 intended to create a vacuum in space 11.
- the tube 13 is placed in a corner of the plate 1 outside of its useful surface .
- a sealing joint 12 is deposited, for example a bead of fusible glass.
- the two plates 1 and 2 are then assembled by pressing them one against the other and by subjecting the assembly to a temperature allowing the softening of the cord 12. This temperature is for example 450 ° C. This sealing is done
- the structure obtained is subjected, via the tube 13 and the pipe 14 to a hot pumping which has the role of causing a degassing of the space 11.
- This step is carried out under a temperature of the order of 360 ° C and lasts about fifteen hours. This degassing is necessary due to the gases generated during the heat sealing of the plates 1 and 2.
- the anode 2 is then debugged by exciting the microtips 7 of the cathode 1 and by pumping the gases emitted by the phosphor elements 8 of the anode by means of the tube 13. This debugging lasts approximately twenty hours.
- the tube 13 is then closed at its free end after having introduced therein an element for trapping impurities, or degasser, commonly called a getter (not shown).
- a getter an element for trapping impurities, or degasser, commonly called a getter (not shown).
- the role of this getter is to absorb the pollution likely to appear during the subsequent operation of the screen.
- the pollution which the getter must absorb are essentially linked to the degassing of the fusible glass bead 12, and to the pollution of the microtips 7 of the cathode 1 during the debugging of the anode 2 which leads to a residual degassing which even continues after tube 13 is closed.
- a drawback of this process is that the thermal and degassing treatments which the screen undergoes do not make it possible to remove all the contaminating elements.
- the layers of the screen will thus continue to degas during the operation of the screen.
- the grains of the phosphor elements 8 of the anode 2 contain on the surface organic elements (in particular carbonates) which are not eliminated during the heat treatment process of the anode in an oxygen-rich atmosphere.
- the gases organic substances present in their natural state in the air for example carbon dioxide CO2, methane CH4, and carbon monoxide CO
- the contamination of the microtips 7 of the cathode 1 is essentially caused by the fact that the organic elements of the anode 2 which are not eliminated by the heat treatment, are on the other hand ionized by the electronic bombardment carried out during the step of debugging.
- the free carbons and carbonates are not removed by hot pumping by means of the tube 13 (steaming under vacuum).
- the invention aims to overcome these drawbacks by proposing a method of assembling a flat display screen which makes it possible to remove contaminants, in particular organic contaminants, and thus to increase the life of the 'screen.
- the invention also relates to an assembly method which makes it possible to avoid the use of a pumping tube and thus reduces the overall bulk of the screen.
- the present invention provides a method of assembling two parallel plates respectively constituting the bottom and the surface of a flat display screen of the type comprising a step for degassing the plates and a step for debugging under vacuum, and including the following steps: - subjecting a first plate to a debugging by means electronic bombardment,
- each plate is separately subjected to a degassing heat treatment before the plates are assembled together, the first plate being subjected to burn-in after its heat treatment.
- the plates respectively support the cathode / grid assembly and the anode of a microtip screen.
- the debugging of the anode is carried out by means of a source of electronic bombardment distinct from the cathode to which it must be permanently assembled.
- the electronic bombardment source consists of an electron gun.
- the electron bombardment source consists of a cathode dedicated to electronic emission microdots, placed at a distance from the anode substantially greater than the distance which separates the anode from the cathode. of an assembled screen, the anode-cathode voltage applied during the debugging step being substantially greater than that of operation of the screen.
- the sealing joint consists of two foils fixed on the internal faces of the plates having an overhang over the entire periphery of the plates, the overhang constituting a zone of sou ⁇ hard foils between them after pressing the plates against each other, each foil being welded to one of the pla - ques prior to the thermal degassing stage of the plates.
- each foil is brazed onto a plate after depositing a metal layer on the internal periphery of the plate.
- the sealing joint consists of a rigid frame interposed between the two plates and coated on its faces opposite the plates, with a layer of metal fusible at low temperature, the seal. ment being effected by inductive heating fusing the layer of fusible metal with the material of the plates.
- the sealing joint consists of a frame of ductile metal interposed between the plates.
- the sealing joint consists of a rigid frame, of dimension somewhat smaller than the dimension of the plates and interposed between the plates, and of a layer of vacuum grease housed in the volume delimited by the free face of the frame and the overhangs of the plates relative to the frame.
- the vacuum grease layer is isolated from the outside of the screen by means of a sealing gel.
- the thick ⁇ sor of the seal is selected to correspond, after sealing, to the thickness of the space between plates defined by spacers distributed over at least one of the plates.
- the invention also relates to an installation for assembling two parallel plates respectively constituting the bottom and the surface of a flat display screen, comprising:
- Figures 1 and 2 which have been described above are intended to describe the state of the art and the problem posed;
- Figure 3 shows schematically a settled ⁇ for carrying out the method according to the invention;
- Figure 4 partially shows in section the structure of a sealing joint of a microtip screen according to a first embodiment of the invention;
- FIG. 5 partially represents and in section the structure of a sealing joint of a microtip screen according to a second embodiment of the invention;
- FIG. 6 represents partially and in section the structure of a sealing joint of a flat screen with micro ⁇ tips according to a third embodiment of the invention.
- An essential characteristic of the method according to the invention is to authorize a burn-in of the anode by means of a source of electronic bombardment distinct from the cathode which will be definitively associated with it, while avoiding re-venting the anode. between its debugging and its assembly with a cathode.
- FIG. 3 schematically illustrates an embodiment of the method according to the invention. This figure shows the structure of the equipment that can be used for the treatments to be applied to an anode plate until it is assembled with a cathode plate.
- an anode plate 2 is introduced into an entry airlock 21 of a tunnel oven 22.
- this introduction is carried out, preferably by vacuum ⁇ progressive by means of several porch.
- airlock 21 the
- the anode plate 2 After having undergone the heat treatment under vacuum or under oxygen plasma to remove part of the organic pollutants from the phosphor elements, the anode plate 2 is transferred to an electronic bombardment station 25. This transfer takes place under vacuum or under inert atmosphere to prevent organic compounds naturally present in the air from polluting the phosphors.
- An advantage of such electronic bombardment is that it allows optimum efficiency of the anode burn-in by allowing the anode to be placed at a significant distance (of the order of a few tens of centimeters) from the bombardment source.
- the energy of the electrons emitted can be much greater, which allows a much faster burn-in (for example of the order of an hour) and significantly more effective.
- the distance between the anode and the source of electronic bombardment also makes it possible to better eliminate, by aspiration, the compounds (free carbon or other) resulting from the burn-in without causing excessive pollution on the bombardment source.
- the plate 2 always passes under vacuum or under an inert atmosphere to a sealing station 26.
- a cathode plate 1 / microtip grid having separately undergone the heat treatments under vacuum degassing and evaporation of the glue of the spacers is introduced into the sealing station 26.
- the plate 1 is introduced into the sealing station 26, just like the plate 2, without having been returned to the air after its heat treatments.
- the heat treatments undergone by the cathode / grid plate 1 can be carried out in a tunnel oven (not shown) similar to the tunnel oven 22 for treating the anode 2.
- the sealing station 26 can be merged with the burn-in station 25.
- the sealing station 26 is provided with a press (not shown,.
- the assembly is carried out under vacuum so as not to polish the anode after it has been burnt.
- the invention provides a new method of cold sealing the two plates 1 and 2 between them.
- FIGS. 4 to 6 Different embodiments of the sealing of the plates 1 and 2 are illustrated in FIGS. 4 to 6. For reasons of clarity, the details constituting the cathode / grid 1 and anode 2 assembly have not been shown on these figures. only symbolically in the form of layers 31 and 32.
- FIG. 4 illustrates a first embodiment of the seal for sealing the plates 1 and 2 respectively of the anode and the cathode.
- This sealing is carried out by means of a rigid peripheral frame 41.
- This frame 41 is for example metallic and is coated on its two faces intended to be in contact with the plates 1 and 2, with layers 42, 43 of low-fuse metal. temperature.
- the thickness of the rigid frame (for example 0.2 mm) corresponds substantially to the height of the entre ⁇ toises (not shown) distributed over the grid.
- the thickness of the layers 42, 43 is for example of the order of 2 to 5 ⁇ m.
- the assembled screen is returned to the atmosphere. Remission to the atmosphere is pref ⁇ No. gradually performed by means of several lock so as not to pollute the vacuum of the sealing station 26.
- a peripheral belt or clips 44 to avoid any possible sliding of the plates 1 and 2 on the frame 41.
- This anti-sliding function can here be filled with the fusible metal layers 42, 43, their crushing under the effect of the press creating overhangs 45 constituting stops.
- the compounds liable to constitute possible pollutants for the anode 2 or the cathode 1 are eliminated during the heat treatment stages which the plates 1 and 2 undergo, under vacuum or under oxygen plasma.
- the two plates 1 and 2 pressed one against the other in the sealing station 26 the parts of the foils 51 and 52 projecting from the surface of the plates 1 and 2 are welded 53 to one another, for example by fusion in a laser.
- the foils are thus sealed at the periphery and the inter-electrode space 11 is isolated from the exterior.
- the resetting of the screen can be carried out as has been explained in relation to FIG. 4.
- FIG. 6 illustrates a third embodiment of the sealing joint according to the invention.
- a frame 61 made of a rigid material which does not degass under vacuum is interposed between the plates 1 and 2 set back from their periphery.
- This frame 61 is for example made of foil of stainless steel or glass.
- the frame 61 is put in place before pressing the plates 1 and 2 one on the other. Once plates 1 and 2 are pressed against the frame
- vacuum grease 62 is deposited in the volume delimited by the free face of the frame 61 and the overhangs of the plates 1 and 2 relative to the frame 61.
- This vacuum grease 62 is chosen to be sufficiently fluid to avoid any micro-leakage possible in line with the frame 61.
- the vacuum grease 62 is more preferably chosen to be compatible with the vacuum and to be stable in contact with air. In the case where the vacuum grease is not stable in contact with air, the application of a sealing gel 63, consisting for example of a silicone-based adhesive, will allow the grease to be isolated. air vacuum 62.
- an insulation layer 64 is interposed between the frame 61 and the areas of the plates 1 and 2 with which it is in contact.
- the role of this insulation layer is always to electrically isolate the frame 61 from the electrical connection tracks of the conductors 4, 5 and 9, respectively of the cathode, grid and anode.
- the relative pressure dif ⁇ ference between the gap inter ⁇ electrodes of the screen and outside the screen keeps the plates 1 and 2 pressed against the frame 61, thereby sealing between the space inter-electrodes 11 and the outside.
- a fourth embodiment (not shown) of the sealing joint according to the invention consists of a peripheral joint made of a ductile metal, such as annealed copper or silver. This seal is interposed between the plates 1 and 2 and is then crushed by means of the press constituting the sealing station 26. Preferably, layers of insulation are interposed between the seal and the plates to isolate the connection tracks. the cathode, grid and anode conductors, the sealing joint.
- the assembled screen is returned to the atmosphere in the manner described in relation to FIG. 4.
- the difference in relative pressure, between l 'empty space between electrodes of the screen and the outside of the screen, main ⁇ holds the seal crushed, which ensures sealing between the space between electrodes and outside.
- the implementation of the invention makes it possible to considerably lengthen the life of the screens by practically eliminating any degassing of the anode during the operation of the screen. It also makes it possible to increase the brightness of the screen by eliminating any pollution of the cathode by organic compounds, the latter having been eliminated prior to the assembly of the plates.
- the method according to the invention eliminates the need for a pumping tube to create a vacuum and allow degassing of the inter-electrode space, which considerably reduces the overall dimensions of the screen. Eliminating the risk of subsequent degassing also makes it possible, if desired, to eliminate the need for a getter.
- the assembly method according to the invention is much faster than conventional methods.
- the choice between a transfer under vacuum or under an inert atmosphere of the plates between the different stations of the installation depends on its equipment, provided that the non-return to air of the plates between the different stations is respected. If, for example, a manual transfer or handling of the plates must be carried out, it is preferable to use a transfer under an inert atmosphere to allow manipulation in a glove box.
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/FR1994/001314 WO1996015542A1 (en) | 1994-11-09 | 1994-11-09 | Method for assembling a flat display |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0738420A1 true EP0738420A1 (en) | 1996-10-23 |
EP0738420B1 EP0738420B1 (en) | 1997-12-17 |
Family
ID=9459823
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95901474A Expired - Lifetime EP0738420B1 (en) | 1994-11-09 | 1994-11-09 | Method and installation for assembling a flat display |
Country Status (5)
Country | Link |
---|---|
US (1) | US5876260A (en) |
EP (1) | EP0738420B1 (en) |
JP (1) | JPH09511613A (en) |
DE (1) | DE69407433T2 (en) |
WO (1) | WO1996015542A1 (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6129603A (en) * | 1997-06-24 | 2000-10-10 | Candescent Technologies Corporation | Low temperature glass frit sealing for thin computer displays |
JP4434481B2 (en) * | 1997-10-01 | 2010-03-17 | コンプリート マルチレイヤ− ソリューションズ リミテッド | Display device |
JP2000315458A (en) * | 1999-04-28 | 2000-11-14 | Toshiba Corp | Method and equipment for manufacturing flat-type image display device |
JP3440906B2 (en) * | 2000-01-07 | 2003-08-25 | 日本電気株式会社 | Apparatus and method for manufacturing plasma display panel |
US6692323B1 (en) * | 2000-01-14 | 2004-02-17 | Micron Technology, Inc. | Structure and method to enhance field emission in field emitter device |
JP3754859B2 (en) * | 2000-02-16 | 2006-03-15 | キヤノン株式会社 | Manufacturing method of image display device |
JP3754883B2 (en) * | 2000-03-23 | 2006-03-15 | キヤノン株式会社 | Manufacturing method of image display device |
WO2002021561A1 (en) * | 2000-09-05 | 2002-03-14 | Motorola, Inc. | Method of manufacturing a field emission device |
JP3634805B2 (en) * | 2001-02-27 | 2005-03-30 | キヤノン株式会社 | Manufacturing method of image forming apparatus |
JP4574081B2 (en) * | 2001-08-09 | 2010-11-04 | キヤノン株式会社 | Manufacturing method of image display device |
US6614168B2 (en) * | 2002-01-11 | 2003-09-02 | Industrial Technology Research Institute | Package method for field emission display |
JP2004146211A (en) * | 2002-10-24 | 2004-05-20 | Noritake Co Ltd | Tabular display device and its sealing method |
JP5068924B2 (en) | 2004-02-20 | 2012-11-07 | 中外炉工業株式会社 | Continuous sealing processing furnace and sealing processing method for glass panel assembly |
CN100459214C (en) * | 2005-12-07 | 2009-02-04 | 陕西科技大学 | Organic electroluminescence displaying apparatus with air eliminative agent |
CN104370473B (en) * | 2013-08-12 | 2016-12-28 | 洛阳兰迪玻璃机器股份有限公司 | Glass plate bombardment depassing unit |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4018490A (en) * | 1975-07-07 | 1977-04-19 | International Business Machines Corporation | Gas discharge display panel fabrication |
JPS5549136A (en) * | 1978-10-05 | 1980-04-09 | Shigeru Obiyama | Continuous working apparatus during pressure reduction |
JPS6171533A (en) * | 1984-09-12 | 1986-04-12 | Futaba Corp | Method of manufacturing display tube |
JP2727224B2 (en) * | 1989-05-15 | 1998-03-11 | キヤノン株式会社 | Method of manufacturing image display device |
US5207607A (en) * | 1990-04-11 | 1993-05-04 | Mitsubishi Denki Kabushiki Kaisha | Plasma display panel and a process for producing the same |
JPH06196094A (en) * | 1992-12-22 | 1994-07-15 | Noritake Co Ltd | Manufacture of vacuum display device |
-
1994
- 1994-11-09 EP EP95901474A patent/EP0738420B1/en not_active Expired - Lifetime
- 1994-11-09 WO PCT/FR1994/001314 patent/WO1996015542A1/en active IP Right Grant
- 1994-11-09 US US08/676,265 patent/US5876260A/en not_active Expired - Fee Related
- 1994-11-09 JP JP8515776A patent/JPH09511613A/en not_active Ceased
- 1994-11-09 DE DE69407433T patent/DE69407433T2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9615542A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE69407433T2 (en) | 1998-06-04 |
DE69407433D1 (en) | 1998-01-29 |
EP0738420B1 (en) | 1997-12-17 |
US5876260A (en) | 1999-03-02 |
WO1996015542A1 (en) | 1996-05-23 |
JPH09511613A (en) | 1997-11-18 |
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