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.
111 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