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Strontium aluminosilicate glass substrates for flat panel display devices

  • US 4,666,868 A
  • Filed: 09/29/1986
  • Issued: 05/19/1987
  • Est. Priority Date: 10/23/1985
  • Status: Expired due to Fees
First Claim
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1. In a flat panel display device containing a flat, transparent substrate for growing large crystal polysilicon semiconductor films thereon, the improvement wherein said substrate is a strontium aluminosilicate glass capable of being melted at temperatures no higher than 1800°

  • C. and which exhibits an annealing point of at least 850°

    C., a linear coefficient of thermal expansion over the temperature range of 25°

    -300°

    C. of about 30-40×

    10-7

    C., a liquidus temperature not exceeding about 1400°

    C., and a liquidus viscosity of at least 1×

    105 poises, said glass being essentially free from alkali metal oxides and consisting essentially, expressed in terms of mole percent on the oxide basis, of about- 12% SrO9-12% Al2 O377-82% SiO2.

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