The proliferation of portable electronic devices Such as pagers, cellular telephones, personal digital assistants, and hand-held computers has driven designers to search for a new generation of display technology. These portable tools demand somethingmore sophisticated than the simple alphanumeric displays of kitchen appliances yet must be smaller than a full-fledged laptop computer. Although a monochromatic display is adequate for some applications, full color is necessary for many and desirable for most; yet it is not easy to achieve in inexpensive, battery-powered devices. Recently, Shen et al. (1, page 2009) described a novel approach to full-color organic electroluminescent (EL) displays that could satisfy this need and demonstrates dramatically the versatility of thin-film organic optoelectronics.
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