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  • Sony to Commercialize Reflective Color TFT-LCDs in 1999
  • July 13, 1998 (TOKYO) -- Sony Corp. developed reflective, color polycrystalline silicon thin film transistor-liquid crystal displays (TFT-LCDs) that operate at low temperatures, and it exhibited them at a private technical show.
    The reflective panels are a 8.6-in. model with 1,024 x 384 pixels and a 4-in. model with 320 x 240 pixels. Each model has a contrast ratio of 17:1 and reflectance of 30 percent, both of which rank high among reflective LCDs, according to the company.

    Use of reflective LCD technology enables the development of thinner and lighter displays because they do not need back lights and they consume less energy.

    Sony will commercialize the LCD technology for use in portable and outdoor-use devices, such as camcorders, digital cameras, personal digital assistants (PDAs) and handheld personal computers as early as next spring.

    CMOS driver circuits using low-temperature polycrystalline silicon are integrated on its glass substrate. A digital to analog converter, which also is implemented on the glass substrate, allows direct input of digital signals.

    Also, Sony is developing smaller low-temperature polycrystalline silicon TFT-LCD panels suitable for use in digital cameras.

    The company will commercialize a front-light-adapter panel that has a light source to brighten the reflective LCD screen. This adapter will be used in the darkness, when daylight or artificial lighting is too dim to allow sufficient reflection, Sony said.

    (Hi-Tech News Center)

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    Updated: Sat Jul 11 21:13:07 1998