Thin film electroluminescent display with improved contrast
First Claim
1. In a TFEL device for providing an optical display, a substrate supporting a laminar thin film re including a set of transparent front electrodes and a phosphor layer sandwiched between front and rear insulating layers, the improvement comprising:
- (a) a set of at least semitransparent rear electrodes deposited on said rear insulating layer;
(b) a set of conductive bus bars arranged colinearly and in contact with each electrode in said set of transparent rear electrodes; and
(c) enclosure means sealed against said substrate for defining a cavity enclosing said laminar thin-film structure, said cavity including within it an optically absorbent material disposed behind the rear electrode set for absorbing ambient light to improve the contrast of the optical display.
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Accused Products
Abstract
A TFEL device having improved contrast includes a laminate having a phosphor layer sandwiched between front and rear insulating layers placed upon a substrate supporting a set of front transparent electrodes. The rear set of electrodes are transparent or semitransparent so as not to reflect ambient light toward the viewer. The TFEL laminate is contained within a cavity created by an enclosure secured to the substrate by an adhesive. Darkly dyed filler material is injected into the cavity whose rear inside wall may have a dark coating. The semitransparent electrodes may be made of gold or may be made of transparent indium tin oxide having narrow aluminum bus bars for improved conductivity.
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Citations
13 Claims
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1. In a TFEL device for providing an optical display, a substrate supporting a laminar thin film re including a set of transparent front electrodes and a phosphor layer sandwiched between front and rear insulating layers, the improvement comprising:
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(a) a set of at least semitransparent rear electrodes deposited on said rear insulating layer; (b) a set of conductive bus bars arranged colinearly and in contact with each electrode in said set of transparent rear electrodes; and (c) enclosure means sealed against said substrate for defining a cavity enclosing said laminar thin-film structure, said cavity including within it an optically absorbent material disposed behind the rear electrode set for absorbing ambient light to improve the contrast of the optical display. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification