RICOH USES INKJET TO FABRICATE E-PAPER

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RICOH USES INKJET TO FABRICATE E-PAPER

 user 2008-12-08 at 10:30:35 am Views: 37
  • #20519

    http://www.tradingmarkets.com/.site/news/Stock%20News/2064767/
    RICOH USES INKJET METHOD TO FABRICATE FINE-RESOLUTION E-PAPER
    TOKYO, Dec  2008 – Ricoh Co.has developed a process using inkjet printing technology to fabricate an electronic paper that offers fine resolution.

    Display resolution has been a problem with e-paper made using inkjet printing techniques, but Ricoh has prototyped a 3.2-inch e-paper display that is 0.3mm thick, bendable and has a resolution of 160 pixels per inch. That resolution stands on par with e-paper made using semiconductor manufacturing techniques.The advantage of inkjet printing is that e-paper can be made for half the cost of methods that depend on vacuum chambers and other expensive equipment.Ricoh hopes to use its technology to enter the market for e-paper in three to four years with products for e-books and advertising media.

    The e-paper is fabricated on a bendable plastic base. To trace the pattern for the transistors and electrodes, ultraviolet light is shined onto a special resin coated over the plastic base. This resin becomes hydrophilic when exposed to UV rays, so only at those places will silver adhere to form electrodes when a silver solution is inkjet-printed onto the base. The precision placement of the electrodes is what boosts the resolution of the e-paper.Next, the transistors are fashioned from an organic semiconductor material, then microscope capsules containing positive-charged black particles and negative-charged white particles are spread down for the pixels. By controlling voltage to the transistors, each pixel can flip between black and white for text and graphics displays.