Flat Panel Displays - alternatives to AMLCDs Message Board

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Technology Stocks : Flat Panel Displays - alternatives to AMLCDs

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To: Trey McAtee who wrote (351)	9/11/1997 4:42:00 AM
From: Toby	of 473

To weigh in once again, EL is a general term describing the conversion of electric current into light. Light emitting diodes electroluminesce, although by a different mechanism than TFEL phosphors. The OLED people also call their field organic EL, which I think was the source of your confusion. The structure of a display like I-K's is similar to LCDs except the lamp, polarizer and LC parts are replaced by an organic LED layer. Therein lies the supposed advantage since the first two sap efficiency and the latter is slow. Their vertical structure is glass with ITO row anode lines and a patterned array of color converters (capable of converting blue light to red, or green). Color converters are more than 50% efficient and are an improvement therefore over color filters which toss out 75% of white light to obtain a primary color. This piece is then blanket coated with several organic layers which form a p-n junction which luminesces in the blue and capped by a metal cathode column lines to complete the passive matrix. The whole device is encapsulated. The blue LED light is either extracted through a blue filter to clean it up, or through red or green color converters, depending on which sub-pixel it is. The whole process is extremely low cost and can be done with shadow masks. Present day OEL materials have shown lifetimes of 60,000 hours at 100 Cd/m2, but I-K hasn't shown their material set to be this durable yet. 20,000 hours would be plenty though. To get to active matrix, the contacts would be replaced by Si/glass transistors driving ITO contact pads (like LCD) below and a common cathode metallization/mirror on top. TDK has announced such a monochrome product. OLEDs will represent the low end of the display market since they are so cheap. How far into the high end they can eat up remains to be seen. Look for monochrome dot matrix products in 1998 and VGA full color displays in 1999.

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