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Wednesday, December 30, 2009

BIDI makes LCD touchscreen A PASSE past

1. This is definitely going to be some thing new for most of the readers.....the following article makes the present touchscreen a PASSEE by introducing the BIDI.

2. The BiDi Screen is an example of a new type of I/O device that possesses the ability to both capture images and display them. This thin, bidirectional screen extends the latest trend in LCD devices, which has seen the incorporation of photo-diodes into every display pixel. Using a novel optical masking technique developed at the Media Lab, the BiDi Screen can capture lightfield-like quantities, unlocking a wide array of applications from 3-D gesture interaction with CE devices, to seamless video communication.The BiDi Screen uses a sensor layer, separated by a small distance from a normal LCD display. A mask image is displayed on the LCD. When the bare sensor layer views the world through the mask, information about the distance to objects in front of the screen can be captured and decoded by a computer.

3. This allows a typical LCD screen working by interpreting hand gestures, without touching the screen.This allows viewers to control on-screen objects by waving their arms in the air without touching the screen, let alone a mouse or keyboard.Although users can touch the screen to activate controls on the display but as soon as they lift their finger off the screen, the system can interpret their gestures in the 3-D.

4. "This is a level of interaction that nobody's ever been able to do before," New Scientist quoted Ramesh Raskar at the Massachusetts Institute of Technology Media Lab, as saying.The screen - dubbed BiDi, short for bi-directional - allows users to manipulate or interact with objects on the screen in three dimensions.

5. It will also function as a 3D scanner, he adds. "If you spin an object in front of screen, the software will stitch together a 3D image."The new system uses an array of optical sensors that are arranged behind a grid of liquid crystals, similar to those used in LCD displays. They physically control how much light passes from the display's backlight.In the new system a regular grid of hundreds of pixels spread across the screen use their liquid crystals to create a tiny hole that acts as a pinhole camera lens, focusing an image of the scene in front onto a thin translucent film a few centimetres behind the LCD.

6. Those images are detected by a camera inside BiDi, allowing the device to know what is happening before it.

7. Thanks http://infotech.indiatimes.com and http://web.media.mit.edu/~mhirsch/bidi/

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