GB842187A - Light amplifier and storage device - Google Patents

Abstract

842,187. Electroluminescent devices. SYLVANIA ELECTRIC PRODUCTS Inc. March 28, 1958 [April 9, 1957], No. 10122/58. Class 39(1). A light amplifying or storage device comprises an electroluminescent layer 23, a matrix including a plurality of discrete transparent pedestals, a layer 33 of photoconductive material disposed on the matrix, electrodes 22, 34 and means on the matrix for limiting the current flow through the photoconductive material to predetermined areas thereof. As shown the limiting means comprises a conductive film 15 covering all but the predetermined areas of the layer 33. The electrodes comprise conductive films 15 on the top and bottom of the matrix, a wire mesh 34 and a conductive film 22 on the remote side of the electroluminescent layer. An opaque webbing 25 may be disposed between the pedestals to prevent optical feedback. The device is made by cutting a first plurality of parallel slots in one surface of a glass blank, cutting a similar plurality of parallel slots in the opposite surface of the blank, the slots on the two surfaces being aligned and leaving glass bridges between the bottom surfaces of the slots, applying the conductive film 15, cutting a plurality of slots narrower than the first centrally through the bridges leaving projections having opposed faces in the slots and applying the photoconductive layer to the blank, the material being in direct contact with the glass of the blank only on the opposed faces of the projections. The photoconductive material is then removed to expose the conductive film on the upper surfaces of the pedestal. The matrix is then glass soldered to the electroluminescent layer. Specifications 731,364, 773,997 and 842,186 are referred to.