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Philips to Demonstrate PolyLED for TV Applications
May 18, 2004
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Philips Electronics of The Netherlands announced that it will demonstrate its first 13-in PolyLED TV prototype based on polymer OLED (organic light-emitting diode) technology at the Society for Information Display's International Symposium in Seattle, U.S. on May 23-28.

Taking as its reference application a wide-screen 30-in diagonal display with WXGA (1,365 x 768) resolution, Philips says it has produced a prototype 13-in carve-out of this display (resolution 576 x 324) to demonstrate the feasibility of manufacturing large-screen polymer OLED displays using high-accuracy multi-nozzle, multi-head inkjet printers. The company says the excellent image quality of its PolyLED TV prototype illustrates the great potential of this new display technology for TV applications. Philips also said that current predictions say a polymer OLED-based TV could be a reality in the next 5 years.

Polymer OLED display technology is said to offer advantages over current LCD displays such as wide-viewing angle and fast response time, making it ideal for moving video. It also reportedly offers excellent black-level performance and outstanding picture contrast since a polymer OLED display is an emissive display. Philips says this also means that it requires no backlight and, therefore, can be manufactured in exceptionally thin form-factors, enabling displays no thicker than a pane of glass without compromising display characteristics.

To demonstrate the polymer OLED display's ease of manufacturability in larger sizes, Philips Research has developed an inkjet printing process using a four print-head printer equipped with 256 piezo-driven nozzles. Together with the PolyLED material suppliers and print head manufacturer Spectra, Philips says it has developed inks, print heads, and substrate processes that enable the production of large screen OLED displays with high accuracy and reliability. The system uses a printing method in which each sub-pixel (R, G, or B pixel) is built up from multiple droplets fired from different nozzles. The system is reportedly capable of printing displays up to 24 in. Larger displays are possible simply by increasing the size of the printer, Philips says.

In 2002, Philips became the first company to launch polymer-based OLED displays for consumer applications, the company claims. Philips is already using OLED displays in several new products such as its latest 639 mobile phone with "Magic Mirror."

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