An Investigation of Characterizing Screen Printing Conditions for Producing Electroluminescent Halftone Display


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Xiaoying Rong, C. Michael Shedd, Nathan Ostrout


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Electroluminescent (EL) displays printed with graphic printing device serves the new demand on lighting and attention grasping marketing. With the developments in materials and electronics technology, printing with electroluminescent inks has been explored by the traditional graphic printing industry in combining graphics and functional materials for producing effective marketing tools. The ability of printing on flexible substrates opens up more opportunities for using electroluminescent materials in building flexible lamps, signage, active packaging, and much more. Electroluminescent lighting is used for backlighting in many display applications. For displaying color images, a transparent image is lit up by placing EL light on the back of the transparent color image. This research investigated screen printing process for producing halftone monochrome EL displays. Printing conditions and qualities, such as mesh counts, ink film thickness, and luminance level of EL lighting were discussed. Halftone displays with different tone values were produced with different printing conditions. The results showed that it is possible to produce monochrome halftone EL displays by patterning the phosphor layer. The luminance of the display was found to be highly related to the characteristics of dielectric layer and electrodes.

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