Samsung unveils double-sided LCD

News

Samsung Electronics announced today that it has created the first LCD panel that can produce independent images on each side of a mobile LCD display.

Samsung's double-sided LCD can show two entirely different pictures or sets of visual data simultaneously on the front and back of the same screen. Other conventional double-sided LCDs can only show a reverse image of the same video data.

This development could replace two display panels with one, thereby reducing overall thickness of mobile products by at least 1mm.

The product makes use of Samsung's new double-gate, thin-film transistor (TFT) architecture. TFT gates are electronic components that convert the necessary voltage at the pixel level, which in turn controls the liquid crystal alignment needed to reproduce on-screen images. Samsung's double-sided LCD has two gates that operate each pixel instead of one, so the screen on the front can display different images than the one on the back.

The double-sided display makes use of Samsung's proprietary Amorphous Silicon Gate (ASG) technology, which accommodates the increased number of TFT gates without increasing the size of the driver integrated circuits. Driver-ICs typically increase in size when more TFT gates are used.

The new Samsung mobile display requires only one backlight instead of two. One side of the panel operates in a transmission mode, while the other operates in a reflective mode. By using a unique reflective design that uses the light trapped in the opposing screen's transmission mode, the reflective mode does not solely rely on external light sources such as the sun.

The double-sided, dual image LCD's efficient use of light to display images in both transmission and reflective modes promotes slimmer, more cost-effective products.

The new double-sided LCD is 2.6mm thick and 56mm wide, with QVGA (240 x 320 pixel) resolution, and has brightness values of 250 nits for the front and 100 nits for the rear display. It will be exhibited at the Consumer Electronics Show, which opens in Las Vegas on January 8.