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Friday, January 05, 2007

A double sided LCD

Samsung has developed a true double sided LCD display panel so that different images can be displayed on each side of the screen.
This is aimed at cell phones, so that just one screen can be used in a clamshell design, shaving vital millimetres off the thickness and cutting down the cost of the components by cutting out a screen and its backlight.
The screen will be shown at CES next week and will start production in the first half of the year.
This is possible by using Samsung's new double-gate, thin-film transistor (TFT) architecture with 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. It also uses a proprietary Amorphous Silicon Gate (ASG) technology which accommodates the increased number of TFT gates without increasing the size of the driver integrated circuits.
The new display also requires only one backlight, as one side of the panel operates in a transmissive mode, while the other operates in a reflective mode. By using a unique reflective design that traps the light from the opposing screen's transmissive mode, the reflective mode does not solely rely on external light sources such as the sun.
The new double-sided LCD is 2.6mm thick and 2.22" 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.

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