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Display panel substrate assembly and an apparatus and method for forming a display panel substrate assembly

  • US 9,889,461 B2
  • Filed: 09/09/2011
  • Issued: 02/13/2018
  • Est. Priority Date: 09/13/2010
  • Status: Expired due to Fees
First Claim
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1. An apparatus for forming a display panel substrate assembly, the substrate assembly comprising a first substrate and a second substrate, at least one of the first substrate and the second substrate being optically clear, the apparatus comprising:

  • a printing device for applying a non-sag adhesive composition comprising a thixotropic material onto a surface of the first substrate, the non-sag adhesive composition being characterized in that it has a viscosity of between about 5 and about 20 Pa·

    s at 25°

    C. and at a shear rate of 1 to 10 sec

    1
    and a viscosity of at least 700 Pa·

    s at 25°

    C. and at a shear rate of 0.01 sec

    1
    , the non-sag adhesive composition further being of a type which is optically clear after curing, wherein the printing device comprises a stencil comprising one or more ribs extending in a printing area from a first side of the stencil to a second side of the stencil, wherein each rib comprises first end at the first side, a second end at the second side, an apex located between the first and second ends, and a side having a tapered portion and wherein each rib tapers from the first end at the first side or the second end at the second side of the stencil towards the apex of the rib between the first side and the second side such that a width of the rib is thinnest at the apex;

    a chamber for the non-sag adhesive composition to be brought into contact with a surface of the second substrate therein at a pressure less than or equal to 5000 pascals; and

    a curing device for curing the non-sag adhesive composition to yield an adhesive layer.

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