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
  • H01J9/241—Manufacture or joining of vessels, leading-in conductors or bases the vessel being for a flat panel display
  • H01J9/242—Spacers between faceplate and backplate
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
  • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
  • H01J29/08—Electrodes intimately associated with a screen on or from which an image or pattern is formed, picked-up, converted or stored, e.g. backing-plates for storage tubes or collecting secondary electrons
  • H01J29/085—Anode plates, e.g. for screens of flat panel displays
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
  • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
  • H01J29/467—Control electrodes for flat display tubes, e.g. of the type covered by group H01J31/123
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
  • H01J29/86—Vessels; Containers; Vacuum locks
  • H01J29/864—Spacers between faceplate and backplate of flat panel cathode ray tubes
• • 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
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J2329/00—Electron emission display panels, e.g. field emission display panels
  • H01J2329/86—Vessels
  • H01J2329/8625—Spacing members
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J2329/00—Electron emission display panels, e.g. field emission display panels
  • H01J2329/86—Vessels
  • H01J2329/8625—Spacing members
  • H01J2329/863—Spacing members characterised by the form or structure
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J2329/00—Electron emission display panels, e.g. field emission display panels
  • H01J2329/86—Vessels
  • H01J2329/8625—Spacing members
  • H01J2329/8665—Spacer holding means

Definitions

• the faceplates and backplates for the desired flat, light portable display are typically about 1 mm thick. To avoid seeing the spacer walls at the exterior of the faceplate, the spacer walls should be hidden behind a suitable structure such as a black matrix.
• flat panel displays to date and standard CRT's have high-temperature assembly requirements, including but not limited to plasma addressed liquid crystal (PALC), and the like, where the alignment during assembly consists of external, mechanical alignment of the faceplate and the backplate so that the correspondence of the phosphor pixels and the associated cathode emitters are initially within tolerance.
• PLC plasma addressed liquid crystal
• These external fixturing devices travel with the field emission display through the required high temperature bonding and sealing processes.
• External fixturing devices have difficulties in maintaining a high precision of alignment because of differences in the coefficient of thermal expansion between the field emission display and the fixturing. Resulting misalignment gives a loss of color purity and resolution in the field emission display.
• Another disadvantage of external tooling is the cost of individual fixture tooling for each field emission display during the sealing and thermal processing of the displays.
• the internal structure includes a spacer wall gripper with a receiving trench formed on the interior side of the faceplate, and a locator formed on the interior side of the backplate.
• the spacer wall is mounted in the receiving trench and is retained in the locator.
• the wall gripper has sufficient flexibility to receive the spacer wall in a substantially straightened geometry which is easily maintained throughout the sealing and thermal processing of the display.
• Each receiving trench has a trapezoid geometry which is very effective in gripping the spacer wall.
• the width of the receiving trench is the same width or smaller than a width of the spacer wall.
• Figure 6 is a schematic diagram illustrating the effect of scattering shields and back scattered electrons.
• Figure 7 is a graph of the fraction of current striking another phosphor subpixel verses the height of scattering shields for a typical display operated at 4 kV.
• Figure 13 is a perspective view of the spacer wall positioned in the receiving trench formed in the black matrix.
• Figure 14 is a perspective view of the faceplate interior side with spacer walls positioned in receiving trenches formed in the black matrix.
• Faceplate 12 includes a plurality of phosphor subpixels 32. Electrons defining an electron beam 34 are accelerated from a plurality of field emitters with energies in the range of 1kV to 10kV. Electron beam 34 is focused by focus grid 36 to strike a corresponding phosphor subpixel 32. There is a one-to-one correspondence between a set of field emitters 22, positioned within a section of focus grid 36, to a phosphor subpixel 32. Each phosphor subpixel 32 is surrounded by a plurality of scattering shields 38 which define a subpixel volume 40.
• wall gripper 42 has a receiving trench 46 geometry with a narrower aperture at the point of receiving a spacer wall 20, than the bottom of receiving trench 46.
• the depth of receiving trench 46 can be about 0.002 inches.
• Field emitters emit electrons at off-normal emission angles when a gate electrode is provided with a suitably positive voltage relative to the field emitter voltage. Emitted electrons move towards phosphor pixels. When struck by these electrons, phosphor pixels emit light.

Landscapes

• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
• Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
• Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

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Citations (6)

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• 1995
  • 1995-11-20 DE DE69530373T patent/DE69530373T2/de not_active Expired - Lifetime
  • 1995-11-20 AT AT95940804T patent/ATE237869T1/de not_active IP Right Cessation
  • 1995-11-20 AU AU42435/96A patent/AU4243596A/en not_active Abandoned
  • 1995-11-20 EP EP95940804A patent/EP0740846B1/de not_active Expired - Lifetime
  • 1995-11-20 JP JP51706796A patent/JP3270054B2/ja not_active Expired - Fee Related
  • 1995-11-20 WO PCT/US1995/015226 patent/WO1996016429A2/en active IP Right Grant

Patent Citations (6)

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