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To: Jack Hartmann who wrote (1613)	5/14/2000 10:36:00 PM
From: sbaker23	Read Replies (2) \| Respond to of 1782

Jack-- It's nice to see some one else is interested in the impending OLED earthquake...not a fiberoptic paradigm, but a revolution in flat panel display technology in the making. The Kodak/Sanyo alliance has the clear production lead, but PANL really seems to have the IPR edge...reading between the lines on the Kodak/Sanyo press release, PANL has all their concerns trumped already (I posted this on the Fool board several days ago): eet.com As photolithography technology is not applicable to the small-scale organic materials that the Kodak/Sanyo group uses, shadow-masking technology is used to form the RGB pixels. For the prototype, a 6-inch shadow mask is used to form the pixel layer, said Yoneda. But the 5.5-inch panel is the maximum size that can be produced with current shadow-masking technology. ...."To compete with existing panels in cost, we need a deposition system with high productivity. We are working to prepare such a system." Forrest's recent Science paper describes such a high-throughput, cheap, efficient, high resolution deposition system--the cold-weld technique: A significant limitation to the realization of advanced organic electronic devices is the lack of a simple and low-cost means for patterning of fragile organic thin films..... The cold-weld technique has several advantages over previously reported patterning methods. First, it is potentially cost-effective, since the stamps are reusable after the metal layers are removed by chemical dissolution. Second, this technique offers high throughput, since the entire electrode area of the circuit is patterned in a single step after all the layers are deposited (20). Indeed, because of its capability for very high pattern resolution, this method is especially suited for the fabrication of micro-displays. Third, roll-to-roll fabrication processes that use flexible plastic substrates can employ this technique, using stamps with patterns on the outer surface of a cylinder. Finally, although we demonstrated the fabrication of small molecular weight, vacuum-deposited OLEDs, we believe that this technique is also applicable to polymer devices where in situ shadow-mask methods are not applicable. In summary, we demonstrated micropatterning of organic optoelectronic devices by the process of cold-welding of metal cathodes followed by lift-off from the organic substrate. Patterns were obtained with feature sizes of 12 æm and with submicrometer feature definition. Further, the method was employed to achieve a monochrome passive matrix OLED display with individually addressable pixels. This technique is potentially cost-effective, offers high throughput, and is suited for large-area and roll-to-roll fabrication. Again from the EE Times article: Though the panel can display full color with these efficiencies, if red's efficiency is improved to about 3 cd/A, the color reproduction will match that of CRTs," Yoneda [of Sanyo] said. "Before volume production starts, we want to improve the emitting efficiency of red to further lower the power consumption, though it is already lower than that of LCDs," he said. Forrest et al. describe such a high efficiency red organic LED in their recent Nature article ncbi.nlm.nih.gov:80/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10693799&dopt=Abstract in which (from the abstract) the internal efficiency of fluorescence can be as high as 100%. As an example, we use this approach to nearly quadruple the efficiency of a fluorescent red organic light-emitting device. PANL (aka Forrest's lab, as far as that goes) has access to superior technology already on both counts...but that's far from having a product...this intellectual property rights royalty game is dangerous if you don't have a product...at least QCOM makes its own chipsets still...