Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J17/00—Gas-filled discharge tubes with solid cathode
  • H01J17/02—Details
  • H01J17/18—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
  • H01J17/183—Seals between parts of vessel

Definitions

• the present invention relates to a Plasma Display Panel(PDP), and particularly to the sealing structure thereof.
• a PDP is most suitable to construct a large screen as a unit device, considering the cost and the space efficiency.
• the adoption of the projection system or the multi-screen system has been contemplated for achieving a large screen in the field of the Cathode Ray Tube or the Liquid Crystal Display.
• the PDP is also suitable to construct the multi-screen system, as it can easily be fabricated in a large unit panel.
• the large area multi- screen system is constructed by stacking a plurality of unit PDPs in a matrix form.
• a conventional display PDP 10 comprises an upper substrate 1 and a lower substrate 2 respectively formed of transparent dielectric material such as glass, cathodes 3 and anodes 4 arranged therebetween in the form of matrix, and barriers 6 for separating cross points thereof to form display cells 5, respectively being the picture element for displaying image.
• Cathodes 3, anodes 4 and barriers 6 are respectively formed on the upper and lower substrates 1, 2.
• two substrates are sealed to form the PDP 10. Sealant is applied on the circumference of any one of the upper or lower substrates by a prescribed breadth inwardly in the cell gap, and is sealed by thermal curing after laying another substrate on the applied substrate.
• the resultant PDP having above described sealing structure accordingly, has the seal 7 which is non-effective portion not displaying an image, of a considerable breadth LI at the circumference thereof.
• the breadth LI of the seal 7 should be formed a considerably large dimension for the sake of the strength or the reliability of sealing.
• a plurality of the above described PDPs 10 are stacked by a matrix to form a multi-screen system, as shown in FIG. 2.
• multiple connecting lines for applying drive or signal voltage for example, connection lines for cathodes 3 of FIG. 1 are extended.
• dielectric layers 9 of considerable thickness should be applied on the connection lines.
• a border having the breadth L2 corresponding to the twice of the sum of the breadth LI of the seal 7 and the thickness of the dielectric layer 9 of two PDPs 10 formed along the peripheral of the effective screen marked in broken line, between two PDPs 10.
• the overall screen which cannot be used for displaying image results in a mosaic type screen divided by border lines respectively having the same thickness as the breadth L2 of the border.
• the breadth L2 of the border is generally referred to as "the display element pitch.”
• a PDP constructed by sealing circumferences of an upper and lower substrates, characterized in that seal is formed by applying a sealant on side ends of two substrates.
• a sealant is pressed by a prescribed pressure after applying.
• a barrier is formed at the outside of the cell gap between two substrates to prevent the penetration of the sealant
• a solid support is embedded at the inside of the seal to prevent the excessive pressing of the seal and the resultant variation of the breadth of the seal.
• FIG. 1 is a sectional view illustrating the seal structure of a conventional PDP
• I iG. 2 is a plan view showing PDPs of FIG. 1 stacked in side by side;
• FIG. 3 is a sectional view indicating the seal structure of a PDP according to the present invention;
• FIG. 4 is a plan view depicting PDPs of FIG. 3 stacked in side by side.
• a PDP 20 comprises an upper substrate 1 and a lower substrate 2, and cathodes 3 and anodes 4 respectively arranged thereon, and display cells 5 formed on each cross points of cathodes 3 and anodes 4 by being partitioned with barriers 6.
• the upper and lower substrates 1, 2 are sealed together after respectively being applied cathodes 3, anodes 4 and barriers 6.
• sealant for sealing the upper and lower substrates 1, 2 together is not applied horizontally between two substrates 1, 2 but applied vertically on side ends of two substrates 1, 2 to form the seal 27. Accordingly, the breadth L3 of the seal 27 is drastically reduced, comparing with that of the conventional seal.
• connection lines extended from cathodes 3, for example, to the side face of the lower substrates 2, can also be embedded in the seal 27, thus gets rid of necessity of additional dielectric layer(numeral 9 of FIG. 2).
• the applied sealant is preferably pressed by a predetermined pressure to form the seal 27 of a predetermined breadth L3.
• a solid support 28 can be embedded in the seal 27.
• the support 28 is preferably a thin plate of dielectric material similar to those of substrates 1, 2 and having a considerable rigidity.
• the support 28 preferably has a breadth same as or larger than that of the cell gap between the upper and lower substrates 1, 2, and is laid vertically on the outside of the junction of two substrates 1, 2.
• the support 28 can be formed in a sheet having the thickness of 0.55mm, and the breadth of 5 ⁇ 7mm.
• barriers 6' is preferably formed at the outside of the cell gap between two substrates 1, 2 to be contacted with the sealant by pressing.
• the breadth L3 thereof can be formed in very small size.
• the breadth L3 of the seal 27 only requires the dimension capable of surrounding connection lines having the diameter of 0.12mm, for example, and the support 28 having the thickness of 0.55mm, thus can be fabricated in very narrow breadth.
• the seal 27 has very small breadth L3 and no additional dielectric layer ( numeral 9 in Fig. 2 ) for embedding connecting lines, thus the breadth L4 of borders can also be formed in very small size.
• the display element pitch is reduced to very narrow pitch, comparing with the size of the overall screen, the multi-screen system can express a natural and high quality image without the division of the screen.
• the PDP 20 according to the present invention not only reduces the area of non-effective screen, by forming the seal 27 on side ends of the upper and lower substrates 1, 2.
• the PDP 20 of the present invention can be used as an independent display device with a high efficiency and space economy, as well as the unit panel of multi-screen system.

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• Gas-Filled Discharge Tubes (AREA)

Applications Claiming Priority (1)

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ID=19375333

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• 1994
  • 1994-11-04 EP EP95900313A patent/EP0738421A1/de not_active Ceased
  • 1994-11-04 JP JP8515206A patent/JPH09507958A/ja active Pending
  • 1994-11-04 WO PCT/KR1994/000156 patent/WO1996014651A1/en not_active Application Discontinuation

Non-Patent Citations (1)

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