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Double-sided electroluminescent device

  • US 5,786,664 A
  • Filed: 03/27/1995
  • Issued: 07/28/1998
  • Est. Priority Date: 03/27/1995
  • Status: Expired due to Fees
First Claim
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1. A double-sided electroluminescent device emitting light from both sides thereof and having a laminated structure in symmetry with respect to a central plane and a central point at a cross of the central plane and a vertical axis of device, said device comprising a pair of transparent substrates, a pair of transparent electrode layers formed respectively on the substrates, a pair of transparent insulating layers formed respectively on the electrode layers, each of the insulating layers having a step near an edge of the respective electrode layer, a pair of conductive bus bars formed respectively on the electrode layers against the steps of the insulating layers, a central phosphor layer mixed with a binder material disposed between both of the insulating layers and the bus bars and positioned on the central plane, and a transparent insulating frame surrounding and sealing peripheral edges of the central phosphor layer, the bus bars and the insulating layers, said transparent insulating frame separating the two electrode layers at their edge areas.

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