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Technology Stocks : Flat Panel Displays - alternatives to AMLCDs
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To: bythepark who wrote (411)11/10/1997 11:24:00 AM
From: bob mackey  Read Replies (1) of 473
 
re: Cambridge Display Technology (and other OLED / LEP displays)

Like Jim says, Organic LEDs still aren't ready for high information content usage, but there are some commercial applications right around the corner. Pioneer will have a car stereo out this fall that has an organic light-emitting polymer display. Also as Jim points out, these displays are extraordinarily sensitive to moisture and especially oxygen. In their excited states, the photoactive species in the polymers are very reactive towards oxygen. There has been some progress made at various companies on this front. Another weakness is corrosion of the indium tin oxide transparent electrode. Again, progress is being made through the use of buffer layers.

And finally, as Jim also said...the voltage range of these devices in not conducive to passive arrays. In fact, the only family of new displays that is likely to offer good contrast and speed with a passive matrix is field emission (FEDs). The non-linearity that is inherent in the field emission process allows only the intended pixel to light, while partially biased pixels in the same row or column are completely dark. Look up "Fowler-Nordheim" for more details...

-bob
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