[FPDI] Japan Display Develops Low-power-consumption Reflective LCD Panel

Oct 26, 2012
Shinya Saeki, Nikkei Electronics
The high-reflectivity type
The high-reflectivity type
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Japan Display Inc developed a reflective LCD panel whose power consumption is as low as 3mW at the time of displaying a still image.

The panel has a screen size of 7.03 inches and is targeted at mobile devices that require a low power consumption.

Japan Display employed a low-temperature polycrystalline silicon TFT as a driver element. And it formed a memory circuit on each pixel to retain image data to be written in the aim of lowering power consumption. The memory formed on each pixel is SRAM. Moreover, the company realized natural display like paper by optimizing the optical design of the scattering layer.

This time, Japan Display developed two types of the panel. One is a high-reflectivity type, and the other is a high-color-purity type. They both have a contrast ratio of 30:1. The high-reflectivity type has a reflectance of 40%, 5% color gamut on NTSC standards and pixel count of 768 x 1,024 (red, green and blue colors assigned to each pixel).

"We can start volume production if a user requests it," the company said.

On the other hand, the high-color-purity type has a reflectance of 28%, 36% color gamut on NTSC standards and pixel count of 576 x 1,024 (red, green, blue and white colors assigned to each pixel).

Japan Display will exhibit the new panel at FPD International 2012, which will take place from Oct 31 to Nov 2, 2012, in Yokohama, Japan.