Double-sided electroluminescent device
First Claim
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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Abstract
A double-sided electroluminescent device emits light from its both sides and has a symmetrically laminated structure. The materials of the insulating layers and the binder of the phosphor layer are the same. The insulating layers and transparent insulating frame form a sealing box to encapsulate the phosphor layer. The bus bars are disposed oppositely in symmetry with respective to the symmetrical plane and a vertical axis of the device. The refractive index of the out most reinforcement layer is higher than that of the substrates.
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Citations
17 Claims
- 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.
- 14. A double-sided electroluminescent device emitting light from both sides thereof and having a laminated structure in symmetry with respect to a central plane, 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 insulating frame separating the two electrode layers at their edge areas, wherein said transparent insulating layers and said binder of the phosphor layers are made of the same material.
Specification