A MULTI-COLOUR ELECTROLUMINESCENT MATRIX DISPLAY PANEL.
Final rept. Apr-Nov 66,
CANADIAN WESTINGHOUSE CO LTD HAMILTON (ONTARIO) RESEARCH AND DEVELOPMENT LABS
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A study was made to develop and demonstrate the techniques necessary to produce a Multi-Colour Electroluminescent EL and Matrix Display. The techniques were to be compatible with the production of larger arrays 1,000,000 elements. The concept considered to have the best chance of success involved the use of three colour triplets of EL material arranged in matrix form. A triplet would consist of EL materials emitting the primary colours of red, blue and green each in one of three discrete areas within the triplet. Green and blue phosphors were used for the green and blue primaries however, the red primary was produced by a green phosphor with a red fluorescent overlay. By activating the EL areas singly or in combination it is possible to produce six colours plus white. Silk screening techniques are readily applicable for the deposition of discrete areas of EL material. A block outline was used around the EL areas for contrast improvement. Good success was attained in electrical accessing of the electrodes for the individual EL areas. A glass cover with small holes etched through it was edgesealed to the EL substrate and conductive silver was introduced into the etched holes to form the electrical connections. Colour balancing was accomplished using an integrating sphere. The objectives of 50 fL white brightness and 1000 hours half life were not compatible. However, a panel emitting 8 fl white could be expected to reach its half life in 1000 hours.