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Light emission enhancing dielectric layer for EL panel

  • US 4,613,793 A
  • Filed: 08/06/1984
  • Issued: 09/23/1986
  • Est. Priority Date: 08/06/1984
  • Status: Expired due to Fees
First Claim
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1. An improved structure for a thin-film electroluminescent device comprising:

  • a substrate;

    a plurality of transparent front electrodes deposited on said substrate and extending in one direction;

    a front dielectric layer deposited over said transparent front electrodes;

    a phosphor layer having luminescent centers deposited over said front dielectric layer, said phosphor layer having a given refractive index;

    a light emission enhancing dielectric layer having a refractive index substantially equal to that of the phosphor layer deposited over said phosphor layer;

    a light sink layer deposited over said light emission enhancing dielectric layer;

    a back dielectric layer deposited over said light sink layer; and

    a plurality of back electrodes deposited over said back dielectric layer and extending orthogonally to the direction of said transparent front electrodes;

    said front and back electrodes adapted to having a driving potential applied first in one polarity and then the opposite polarity across intersecting portions thereof during a refresh cycle;

    whereby during a refresh cycle when the back electrode at an intersecting portion is positive in potential the front dielectric layer coacts with the phosphor layer to generate light and when the front electrode at the intersecting portion is positive in potential the light emission enhancing dielectric layer coacts with the phosphor layer to generate light.

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