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Transparent laminates and optical filters for displays using same

  • US 6,104,530 A
  • Filed: 05/27/1997
  • Issued: 08/15/2000
  • Est. Priority Date: 05/28/1996
  • Status: Expired due to Term
First Claim
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1. An optical filter for plasma displays which blocks electromagnetic waves and near-infrared radiation emerging from the plasma display, said optical filter comprising:

  • a transparent laminate formed by laminating high-refractive-index transparent film layers and metal film layers consisting of silver or a silver-containing alloy on one surface of a transparent substrate in such a way that a repeating unit comprising a combination of one high-refractive-index transparent film layer and one metal film layer in this order is repeatedly laminated from three times to six times, and further laminating at least a high-refractive-index transparent film layer thereon;

    wherein a sheet resistance of an electrically conductive surface of a topmost surface of the transparent laminate is not greater than 3 ohm/sq., and said transparent laminate has a visible light transmittance of not less than 50%, and a light transmittance of not great than 20% at any wavelength between 820 nm and 1000 nm;

    a metal containing electrode electrically connected to the electrically conductive surface; and

    the transparent laminate contains a dye which is near-infrared absorbing dye and/or a toning dye which has an absorption band in the visible region.

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