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Toshiba develops world's first 4-inch TFT LCD with VGA resolution

8 March, 1999

Tokyo--Toshiba Corporation today announced the world's first 4-inch low temperature polysilicon TFT LCD to realize VGA resolution (640 x 480 pixels). The new TFT LCD offers a highly durable, slim, light display with low power consumption. It will be demonstrated at the Display Search Conference in USA on March 10 and 11. Worldwide marketing starts today.

Low temperature polysilicon TFT LCD use crystallized silicon that allows electrons to flow between transistors at a much faster rate than the amorphous (non-crystallized) silicon used in standard TFT LCDs. The improved performance allows external LCD TAB drivers to be formed within the display itself, achieving a much reduced overall panel size. The number of components for LCD module is cut by 40% and the number of connections between TAB driver and electrode on the panel cut by 95%, a simpler design that fosters greater reliability. Resolution is also enhanced, and 4" VGA panel offers photo image quality to the end-user.

High durability and low weight and power consumption are essential for personal digital assistants which is enjoying brisk growth in demand. Low temperature polysilicon TFT LCDs will support lighter, more versatile products offering better displays.

Toshiba has already announced 8.4-inch and 10.4-inch low temperature polysilicon TFT LCD for use in portable computers. With its new 4-inch model the company can now meet a wider range of demands.


Basic Specifications
Number of pixels640 x 480 (VGA)
Pixel pitch0.126 x 0.126 mm (200ppi)
Display size4-inch diagonal
Number of colors256k-colors
Power consumption350mW
Response timeon+off:40ms
Contrast ratio250:1
Dimensional outline94(W) x 70(H) x 1.8(D)mm

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