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  Composition of glass for plasma display panel and fabrication method thereofUSPTO Application #: 20070298956Title: Composition of glass for plasma display panel and fabrication method thereof Abstract: A glass composition for a plasma display panel (PDP) and its fabrication. method are disclosed. The composition, comprising a ZnO—B2O3 group and alkaline earth metal oxide, is environment-friendly, has a high discharge efficiency and is used as various PDP dielectric materials. The fabrication method allows to compose the low melting point unleaded non-alkali glass composition at a low cost. (end of abstract) Agent: Fleshner & Kim - Chantilly, VA, US Inventors: Tae In Kwon, Byung Gil Ryu, Won Seok Moon, Sung Wook Lee USPTO Applicaton #: 20070298956 - Class: 501049000 (USPTO) Related Patent Categories: Compositions: Ceramic, Ceramic Compositions, Glass Compositions, Compositions Containing Glass Other Than Those Wherein Glass Is A Bonding Agent, Or Glass Batch Forming Compositions, Nonsilicate Oxide Glasses, Boron Containing The Patent Description & Claims data below is from USPTO Patent Application 20070298956. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a Continuation Application of prior U.S. patent application Ser. No. 10/740,502 filed Dec. 22, 2003, which claims priority under 35 U.S.C. .sctn.119 to Korean Application Nos. 53824/2003 filed on Aug. 4, 2003, whose entire disclosures are hereby incorporated by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a plasma display panel (PDP) and, more particularly, to a composition of glass for PDP and its fabrication method. [0004] 2. Description of the Background Art [0005] In general, a plasma display panel (PDP) device receives much attention as a next-generation display device together with a thin film transistor (TFT), a liquid crystal display (LCD), an EL (Electro-Luminescence) device, an FED (Field Emission Display) and the like. [0006] The PDP is a display device using a luminescent phenomenon according to an energy difference made when red, green and blue fluorescent materials are changed from an excited state to a ground state after being excited by 147 nm of ultraviolet rays which are generated as a He+X3 gas or N3+X3 gas is discharged from a discharge cell isolated by a barrier rib. [0007] Thanks to its properties of facilitation in manufacturing from a simple structure, a high luminance, a high light emitting efficiency, a memory function, a high non-linearity, a 160.degree. or more optical angular field and the like, the PDP display device is anticipated to occupy large-scale display device markets. [0008] A structure of the conventional PDP will now be described with reference to FIG. 1. [0009] FIG. 1 is a sectional view showing a structure of a conventional PDP. [0010] As shown in FIG. 1, the conventional PDP includes: a lower insulation layer 20 formed on a lower glass substrate 21; an address electrode 22 formed at a predetermined portion on the lower insulation layer 20; a lower dielectric layer 19 formed on the address electrode 22 and the lower insulation layer 20; an isolation wall 17 defined in a predetermined portion on the lower dielectric layer 19 in order to divide each discharging cell; a black matrix layer 23 formed on the isolation wall 17; a fluorescent layer 18 formed with a predetermined thickness on the side of the black matrix layer 23 and the isolation wall 17 and on the lower dielectric layer 19, and receiving ultraviolet ray and emitting each red, green and blue visible rays; a glass substrate 11; a sustain electrode 12 formed at a predetermined portion on the upper glass substrate 11 in a manner of vertically intersecting the address electrode 22; a bus electrode 12 formed on a predetermined portion on the sustain electrode 12; an upper dielectric layer 14 formed on the bus electrode 13, the sustain electrode 12 and the upper glass substrate 11; and a protection layer (MgO) 15 formed on the second upper dielectric layer 14 in order to protect the upper dielectric layer 14. [0011] The operation of the conventional PDP will now be described. [0012] First, as the upper glass substrate 11 and the lower glass substrate 21 of the conventional PDP, an SLS (Soda-Lime Silicate) glass substrate is used. [0013] The lower insulation layer 20 is positioned on the lower glass substrate 21, the SLS glass substrate, and the address electrode 22 is positioned on the lower insulation layer 20. [0014] The lower dielectric layer 19 positioned on the address electrode 22 and the lower insulation layer 20 blocks visible rays emitted toward the lower glass substrate 21. [0015] In order to increase the luminous efficacy, a dielectric layer having a high reflectance is used as the lower dielectric layer 19. The lower dielectric layer 19, a translucent dielectric layer with a reflectance of 60% or above, minimizes loss of light. [0016] The fluorescent layer 18 is formed by laminating in a sequential order of red, green and blue fluorescent materials. A specific wavelength of visible ray is emitted depending on an intensity of an ultraviolet ray according to plasma generated between the isolation walls 17. [0017] Meanwhile, at a lower surface of the upper glass substrate 11, the SLS glass substrate, there are formed the sustain electrode 12 positioned to vertically intersect the address electrode 22 and the bus electrode 13 positioned on the sustain electrode 12. And upper dielectric layer having an excellent light transmittance is positioned on the bus electrode 13. [0018] The protection layer 15 is positioned on the upper dielectric layer 14 in order to prevent the upper dielectric layer 14 from being damaged due to generation of plasma. Herein, since the upper dielectric layer 14 is directly contacted with the sustain electrode 12 and the bus electrode 13, it must have a high softening temperature in order to avoid a chemical reaction with the sustain electrode 12 and the bus electrode 13. [0019] Thereafter, as the upper plates 11.about.15 and the lower plates 19.about.22 are bonded by a seal material 16, a PDP is completely formed. [0020] Of the formed structures, the isolation wall 17, the lower dielectric layer 19, the upper dielectric layer 14, the seal material 16 are glass compositions containing a large amount of Pb. [0021] In addition, the fabrication process of the isolation wall 17, the lower dielectric layer 19, the upper dielectric layer 14 and the seal material 16 may have a vital influence on a human body. [0022] Moreover, discarding of the glass composition may cause an environmental pollution. Continue reading... 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