News Release: The former Toshiba Mobile Display

May 29, 2007

Toshiba Matsushita Display Technology Develops a New Series of “Screen Fit” TFT LCDs with Transparent Cover Panel
- Integrated Cover Panel and Transparent Resin Combine to Ensure Impact Resistance and Improved Legibility -

Toshiba Matsushita Display Technology Co., Ltd. (TMD) has developed a new series of thin-film transistor (TFT) liquid crystal displays (LCD) utilizing a "Screen Fit" transparent cover panel. The displays are intended for cellular phone and other mobile applications. A "Screen Fit" cover panel is integrated with the liquid crystal display panel using transparent resin, to ensure impact resistance and improved legibility. TMD will introduce this series starting with a wide-QVGA (240x400) TFT display, and then intends to expand the product line-up to include QVGA (240x320), wide-VGA (800x480) and other mobile displays. TMD plans to start mass production in June 2007 with projected total monthly output of 500,000 units.

With "Screen Fit", a special resin is injected between the cover panel and the polarizing film at the surface of the LCD panel, fusing the two together. The resin assures optical integrity between the two materials since it minimizes interface reflections and hardens without any optical irregularities. During production, the resin is injected in its liquid state between the cover panel and the LCD panel, and as it solidifies, it will minimize any deflection or irregularities between the cover panel and LCD panel, thus reducing mechanical stress in the entire system and contributing to high-performance display characteristics. Also, the resin has minimal optical degradation over the course of time, thus the high-performance display characteristics remain stable, too.

Compared to a conventional LCD design, in which the top polarizer film layer of the display is protected by an acrylic cover panel encasing the hollow space between the cover and the display, the newly developed "Screen Fit" LCD enhances the display optical characteristics by minimizing the reflected light from the inner surface of the cover panel, as well as the reflections from the surface of the LCD panel, to approximately 4 percent each. As a result, the contrast of the display is increased, due to the reduction of external and internal light reflections while the display transmittance is improved by approximately 7 percent, combining to enhance the display’s legibility. Luminance is improved with increased transmittance, thereby decreasing power consumption and benefiting the environment. Furthermore, due to the integration of the cover panel design, durability and reliability is increased, and thickness is reduced, addressing the need found in cellular phones and other mobile devices for thinner profile designs.

Item Specifications of newly developed product
Screen size (Diagonal) 2.8-inch (7.1 cm)
Number of pixels WQVGA: 240 (H) x RGB x 400(V)
Luminance 300 cd/m2
Contrast 600:1
Thickness
(including cover glass)
2.6 mm
Number of colors 260K

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