Hitachi Develops HD LCD Panel By Using Amorphous Si TFTs

Sept 28, 2011 18:19 Shinya Saeki, Nikkei Electronics

Hitachi Displays Ltd developed a high-definition (720 x 1,280-pixel) LCD panel by using amorphous silicon (Si) TFTs as driver elements.

The screen size and resolution of the panel are 4.5 inches and 329ppi, respectively. It is targeted at smartphones.

In February 2011, Hitachi Displays developed a 4.5-inch LCD panel with a pixel count of 720 x 1,280 by using low-temperature polycrystalline Si TFTs as driver elements (See related article). In response to the active demand for smartphones, the company developed an LCD panel having the same resolution by using amorphous Si TFTs.

This time, Hitachi Displays combined a technology that increases the aperture ratio of pixel and a backlight technology that enables to efficiently use light. As a result, even when amorphous Si TFTs are used as driver elements to improve resolution, brightness does not decrease much, the company said.

The display mode of the panel is based on the IPS method. It has a 70% color gamut on NTSC standards. Its view angle is 160° in both the vertical and horizontal directions. The brightness and contrast ratio of the panel are 500cd/m² and 1,000:1, respectively.

Hitachi Displays will exhibit the panel at FPD International 2011, which will take place from Oct 26 to 28, 2011, in Yokohama, Japan.

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