Fujitsu’s Display Innovations
Fujitsu’s secret recipe
Packed with innovative technology and new display concepts, ALiS (Alternate Lighting of Surfaces Method) and eALiS (Extended Alternate Lighting of Surfaces Method) consistently set the standard for plasma displays.
ALiS – Fujitsu’s First Display Innovation
When it was launched onto the plasma marketplace in 1999, ALiS (Alternate Lighting of Surfaces Method) was specifically designed to make high resolution and high brightness plasma displays cost-effective.
Conventional plasma panels have a strip of electrodes for each horizontal line of plasma cells. ALiS panels make a difference by sharing an electrode strip between two lines of cells. These lines switch on and off rapidly, thousands of times per second. At any given instant only half the panel's pixels are turned on. This means there is less screen "real estate" taken up by electrode strips (seen as black grid lines on conventional plasma screens), there's a greater phosphor area to be illuminated and the aperture ratio is increased by 55 percent. As a result, ALiS panels provide an exceptionally clear, bright image. Another spin-off benefit is that the pixel lighting duty is reduced by 50%, improving phosphor lifetime and reducing the power required to match the output of conventional plasma drive systems by half.
eALiS – Fujitsu’s New Progressive Display Technology
eALiS extends Fujitsu’s proprietary ALIS (Alternate Lighting of Surfaces Method) plasma drive system to include progressive display technology and is specifically designed for large screen plasma displays. As with ALiS, instead of two discrete electrodes assigned to each scan line, a common electrode is shared between adjacent scan lines, reducing electrode density. Unlike ALiS, which uses continuous vertical channels of phosphor material to eliminate the horizontal non-picture gaps between lines, eALiS adopts a grid system to enclose individual cells. This ensures that the cells respond more accurately to the image input. A common horizontal electrode is used to reduce the size of the rib wall and ensure that the grid cannot be seen behind the picture. Odd lines and even lines are addressed alternately, but with eALiS all lines are now displayed at once in a progressive rather than interlaced fashion, giving a more precise and smoother overall image.
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