EP0012140B1 - Gasentladungsanzeigeeinrichtungen - Google Patents

Gasentladungsanzeigeeinrichtungen Download PDF

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Publication number
EP0012140B1
EP0012140B1 EP19780300830 EP78300830A EP0012140B1 EP 0012140 B1 EP0012140 B1 EP 0012140B1 EP 19780300830 EP19780300830 EP 19780300830 EP 78300830 A EP78300830 A EP 78300830A EP 0012140 B1 EP0012140 B1 EP 0012140B1
Authority
EP
European Patent Office
Prior art keywords
spacers
dielectric
conductor
array
conductors
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.)
Expired
Application number
EP19780300830
Other languages
English (en)
French (fr)
Other versions
EP0012140A1 (de
Inventor
Charles Hampton Perry
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Priority to EP19780300830 priority Critical patent/EP0012140B1/de
Priority to DE7878300830T priority patent/DE2861964D1/de
Publication of EP0012140A1 publication Critical patent/EP0012140A1/de
Application granted granted Critical
Publication of EP0012140B1 publication Critical patent/EP0012140B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
    • H01J11/10—AC-PDPs with at least one main electrode being out of contact with the plasma
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
    • H01J11/20—Constructional details
    • H01J11/34—Vessels, containers or parts thereof, e.g. substrates
    • H01J11/36—Spacers, barriers, ribs, partitions or the like
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2211/00—Plasma display panels with alternate current induction of the discharge, e.g. AC-PDPs
    • H01J2211/20—Constructional details
    • H01J2211/34—Vessels, containers or parts thereof, e.g. substrates
    • H01J2211/36—Spacers, barriers, ribs, partitions or the like
    • H01J2211/361—Spacers, barriers, ribs, partitions or the like characterized by the shape
    • H01J2211/363—Cross section of the spacers

Definitions

  • This invention relates to gaseous discharge display devices, hereinafter referred to as gas panels.
  • a further technique uses metallic spacers which are located on one of the glass plates prior to the deposition of the conventional dielectric coating; see U.S. Patent 4,091,305.
  • Such a technique makes it extremely difficult to provide a uniform dielectric coating over the entire surface of the panel so that the dielectric surface in the spacer areas is not perfectly flat and is mechanically weak, and unstable point contact may result.
  • differences in dielectric thickness in respect of individual cells resulting from such arrangements require variations in the electrical parameters of control signals used to control the device, and eliminate or severely restrict the panel margin.
  • a gaseous discharge display device comprising a pair of glass plates each having an array of parallel conductors formed thereon overlaid with a dielectric layer, the plates being sealed together at their edges in superimposed spaced parallel relationship with the conductor arrays being disposed substantially orthogonally to one another to define a plurality of discharge gaps, each formed at the cross-point of a conductor of one array with a conductor of the other array, and metal spacers disposed between the dielectric layers for maintaining the discharge gaps precisely spaced over the area of the display device, characterised in that the spacers are in the form of rods having a trapezoidal cross-section with the non-parallel edges thereof converging in a direction away from the front plate of the device.
  • gaseous discharge display device (or gas panel) there shown corresponds generally to that described in U.S. Patent 3,837,724, and the fabrication steps are generally similar except in so far as they relate to details of the spacers as described below.
  • a plurality of parallel vertical lines includes groups of eight vertical lines such as that designated V 3 , and groups of nine horizontal lines such as those designated Hr, and H 7 .
  • the horizontal lines are formed on the front plate of the device (upper plate in fig. 2), while the vertical lines V 3 are formed on the back plate of the panel.
  • Each intersection of a group of horizontal lines and a group of vertical lines defines an 8 x 9 dot matrix for generating alpha-numeric each of the characters being generated within a 7 x 9 submatrix so as to leave a single column space between characters.
  • Fig. 2 is a sectional view of the gas panel.
  • the bottom or back glass plate 21 has metallic conductors 23 formed thereon (corresponding to the vertical conductors such as V 3 ) and is overcoated with a layer of dielectric 25. While not strictly necessary, the dielectric layer 25 may be overcoated with a layer of refractory secondary emissive material 27 such as MgO.
  • the upper or front plate 31 has conductors 33 formed thereon (corresponding to the horizontal conductors such as H 5 or H 7 ), the conductors 33 being disposed substantially orthogonal to conductors 23, and the plate 31 is also overcoated with a dielectric layer 35. Bonded to the dielectric layer 35 are metallic spacers 9, both the layer 35 and spacers 9 being overcoated with a further layer 37 of the . refractory secondary emissive material to protect the dielectric surface and facilitate low voltage operation.
  • FIG. 1 The plan view shown in Fig. 1 portrays an idealized situation, since the spacers 9 are, shown located only between rows of characters which, in most practical applications, would not provide the best distribution of spacers. father, the spacing members are designed for, positioning between any pair of adjacent drive lines, preferably between horizontal drive lines, and this permits a freedom of placement of spacers over the display surface to provide optimum load bearing characteristics. As described in the previously mentioned U.S.
  • the horizontal and vertical conductors are chrome-copper-chrome conductors, and in the present embodiment preferably have a resolution of about 28 lines per cm (70 lines per inch) in each direction with 0.076 mm (3 mil) wide conductors spaced on 0.355 mm (14 mil) centres, giving a separation of 0.279 mm (11 mils) between adjacent conductors.
  • the spacers 9 of this embodiment are 0.127 mm (5 mils) wide at their base, 0.1 mm (4 mils) thick and 6.35 mm (250 mils) long, and are positioned centre to centre in both vertical and horizontal directions with respect to adjacent spacers about 5 cm (2 inches).
  • the spacers 9 should be separated from the adjacent conductors 33 by 0.05 mm (2 mils) to avoid an adverse effect on the electrical characteristics on adjacent conductors, particularly the panel margin or the difference between V s max and V s min where V . represents the sustain signal.
  • the spacers 9 must be positioned to an accuracy of ⁇ 0.025 mm ( ⁇ 1 mil) to avoid such problems.
  • one of the problems associated with metal spacers relates to their visibility, which is caused primarily by reflection from the surface of the spacers such that the spacers are readily visible to viewers positioned at only a slight angle relative to the normal to the display surface.
  • One way to reduce reflection from metal spacers is to oxidize the surface of the spacers to reduce the reflectivity.
  • the spacers 9 in the present case are composed of a nickel-iron alloy having approximately equal percentages by weight of the two component elements, and the spacers are oxidised prior to assembly of the panel.
  • An additional advantage of the oxide coating is that the spacers 9 are further protected from the plasma during operation.
  • the spacers 9 are secured to the dielectric 35, prior to assembly of the lower plate 21, by conventional thermal compression or ultrasonic bonding techniques depending on the bonding medium.
  • a drop of solder glass approximately 0.127 mm (5 mils) in diameter and 0.025 mm (1 mil) thick is applied to the surface of the spacer to be bonded to the dielectric.
  • the spacer is then positioned on the dielectric surface 35 under appropriate loading such as 15 grams and sufficient heat is applied to effect a glass-solder bond. Load and heat are chosen to optimize the strength of the bond and the reliability of the overall process.
  • the oxidized surface of the spacer improves the adhesion between the solder glass and the spacer, and also improves the adhesion of the MgO layer 37 which is applied by evaporation over the dielectric 35 and the spacers 9 to provide a refractory surface which protects the device from sputtering of the dielectric or the spacers and simultaneously by virtue of its secondary emission characteristics permits lower operating voltages.
  • the use of magnesium oxide for both purposes is well known.
  • the nickel-iron alloy was developed so that its coefficient of thermal expansion would match that of the plate glass on which it is mounted.
  • the essential feature of the spacers 9 relates to their shape.
  • the metallic spacers 9 are in rod form and have a cross-section which corresponds to an inverted trapezoid as shown in Fig. 3, the base or widest part of the trapezoid being disposed facing the front or upper plate 31.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Gas-Filled Discharge Tubes (AREA)

Claims (2)

1. Gasentladungsanzeigevorrichtung enthaltend: Ein Paar Glasplatten (21, 31) mit jeweils hierauf angebrachtem, parallele Leitungszüge (23, 33) aufweisendem Leiterbild, das von einer dielektrischen Schicht (25 bzw. 35) bedeckt ist, wobei die Platten (21, 31), parallel in gewissem Abstand zueinander übereinanderliegend, an ihren Rändern zusammengelötet sind und die Leiterbilder (23, 33) im wesentlichen orthogonal zueinander angeordnet sind, um eine Anzahl von jeweils an einen Kreuzungspunkt eines Leitungszuges des einen Leiterbildes mit einem Leitungszug des anderen Leiterbildes gebildeten Gasentladungsstrecken zu definieren, und zwischen den dielektrischen Schichten (25, 35) angeordneten Metall-Abstandshalter (9), um über der gesamten Fläche der Anzeigevorrichtung genaue Abstände für die Gasentladungsstrecken einzuhalten dadurch gekennzeichnet, daß die Abstandshalter (9) in Form von Stäbchen mit trapezförmigem Längsschnitt vorliegen, dessen nicht parallele Kanten in von der Frontplatte (31) der Vorrichtung fortweisender Richtung aufeinander zulaufen.
2. Anordnung wie in Anspruch 1 beansprucht, bei welcher die Abstandshalteroberfläche oxidiert ist.
EP19780300830 1978-12-15 1978-12-15 Gasentladungsanzeigeeinrichtungen Expired EP0012140B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19780300830 EP0012140B1 (de) 1978-12-15 1978-12-15 Gasentladungsanzeigeeinrichtungen
DE7878300830T DE2861964D1 (en) 1978-12-15 1978-12-15 Gaseous discharge display devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19780300830 EP0012140B1 (de) 1978-12-15 1978-12-15 Gasentladungsanzeigeeinrichtungen

Publications (2)

Publication Number Publication Date
EP0012140A1 EP0012140A1 (de) 1980-06-25
EP0012140B1 true EP0012140B1 (de) 1982-07-21

Family

ID=8186029

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19780300830 Expired EP0012140B1 (de) 1978-12-15 1978-12-15 Gasentladungsanzeigeeinrichtungen

Country Status (2)

Country Link
EP (1) EP0012140B1 (de)
DE (1) DE2861964D1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE8403066L (sv) * 1983-06-16 1984-12-17 American Telephone & Telegraph Forbettringar hos eller med avseende pa skermanordningar
US5264758A (en) * 1989-10-18 1993-11-23 Noritake Co., Limited Plasma display panel and method of producing the same

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798483A (en) * 1970-05-20 1974-03-19 F Walters Gaseous discharge display device with a layer of electrically resistant material
GB1326384A (en) * 1970-05-20 1973-08-08 Ferranti Ltd Visual display devices
US3935500A (en) * 1974-12-09 1976-01-27 Texas Instruments Incorporated Flat CRT system
US3998510A (en) * 1974-12-23 1976-12-21 Owens-Illinois, Inc. Method of using invisible spacers for electro-optical display device manufacture
GB1509487A (en) * 1976-01-08 1978-05-04 Ibm Gas panel display devices

Also Published As

Publication number Publication date
DE2861964D1 (en) 1982-09-09
EP0012140A1 (de) 1980-06-25

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