Rogers Corporation

Michael S Lunt

William P Harper

Jeffrey B Otto

Bruce M Arnio

Douglas H Tracy

Norman L Greenman

Richard C Berry

In an electroluminescent lamp having a phosphor layer disposed between corresponding lamp electrodes adapted to apply an excitation potential to cause the phosphor layer to emit light, a front lamp electrode which, in addition to being light transmissive to radiation from the phosphor layer, consists of a thin layer of light-transmissive binder containing a distribution of discrete particles that are characteristically light-reflective and electrically conductive. The electrode particles provide aggregate diffuse outward reflectance sufficient to serve as a reflector behind an LCD display for ambient light that falls upon the LCD display to illuminate the display under light ambient conditions. Furthermore, the particles in the electrode layer are adapted to contribute to electrical continuity through the layer sufficient to apply excitation to the phosphor layer, and the electrode layer particles have sufficient spaces between them to provide escape-paths for light from the excited phosphor layer to back-illuminate the LCD display under dark ambient conditions. A method of forming the improved electrode, e.g. by shear transfer techniques, is also described. Certain aspects of the invention apply to the function of improved transflective layers, per se.

Backlighting for electro-optical passive displays and transflective

The invention provides electroluminescent lamps that contain light-emitting phosphors and covering layers which have unusual durability, light transmissivity and resistance to moisture using simple screen printing and doctor blade coating techniques. It is discovered that a liquid dispersion of thermoplastic polymer powder particles, e.g. predominantly of polyvinylidene fluoride, simultaneously: (a) can suspend electrical property additives, such as crystalline, hard, dense particles of generally spherical shape, uniformly in desired concentrations (b) while containing a useful concentration of any of a wide range of such particles, can be deposited by high shear transfer to a substrate in accurately controllable thickness and contour; (c) when so deposited can be fused into a continuous uniform film which has low absorptivity, e.g. of moisture and acts as a barrier film; (d) can, as one layer, be fused with other such layers, containing other electrical property additives, to form a monolithic electrical component; and, (e) in general, can meet all requirements for the making of electroluminescent lamps.

Electroluminescent lamp having a polymer phosphor layer formed in

An improved fiber reinforced material for use in the manufacture of gaskets is produced by impregnating a nonwoven fabric with an aqueous dispersion of a rubber and filler. The water is then evaporated out of the impregnated fabric. The final product is formed by curing the rubber under heat and pressure.

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Abbington, CT, United States of America

Michael S Lunt