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Tuesday, May 20, 2008
NEC LCD Technologies Enable Design of Non-rectangular TFT LCD Modules

NEC LCD Technologies today announced the successful development of a manufacturing technology that enables more flexible design of thin-film transistor (TFT) liquid crystal display (LCD) panels.

The prototype design, a "heart-shaped," low-temperature poly-silicon (LTPS) color TFT LCD module formed using two half-circular arcs and two straight lines, has a display width of 4.0 centimeters (cm), height of 3.6 cm and pixel pitch of 174 micrometers (146 pixels per inch). A presentation about the new technology, titled "A Non-Rectangular Heart-Shaped SOG-LCD," will be given at the Society for Information Display (SID) Symposium on Friday, May 23, 2008, from 9:00 a.m. to 10:20 a.m. in Petree Hall at the Los Angeles Convention Center.

The new technology enables optimal arrangement of gate and data lines in the pixel array and minimizes the overlaps between gate and data driver circuitry, when the module is non-rectangular in shape. By applying its proprietary value-integrated TFT (VIT) technology and integrating the driver circuits into the module along the perimeter of the LCD glass, NEC LCD Technologies has simplified the interconnection scheme and reduced the area needed to contain the wiring and interconnections between external circuits, thereby yielding a bezel as slim as 2.0 millimeters (mm) .

Traditional display modules are rectangular in shape, since it is the simplest, most efficient and versatile shape for accommodating the pixel arrays. Recently LCD suppliers have started to introduce fairly simple non-rectangular LCD shapes, including circles, ellipses and rectangles with trimmed corners. The shapes have been fairly simple because the more complex the shape, the more difficult it is to accommodate the wiring patterns, resulting in thicker bezels and greater consumption of power. Displays with non-rectangular shapes are generally targeted to replace mechanical instrument gauges-such as the speedometers and tachometers found in cars-and other applications that require simple shapes.

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