|Video Technology Magazine||November 2003
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Wait, this isn't all of it though because the X and Y resolution is fine for a gray scale image, but what about color?
More information about YUV is available at fourCC.org.
Simply put, 8-VSB is the RF modulation format utilized by the approved by the FCC for the ATSC digital television standard to transmit digital bits over the airways to the home consumer. Since any terrestrial TV system must overcome numerous channel impairments such as ghosts, noise bursts, signal fades, and interference in order to reach the home viewer, the selection of the right RF modulation format is critical.
I have put together a rather extensive site containing many articles,papers and reports from the FCC on the subject. 8VSB.com
Just 0.3 mm thick, the display developed by Chen and team can be flexed without distorting the type and paves the way for electronic newspapers, wearable computer screens and smart identity cards.
"It's the closest thing demonstrated today to electronic paper," says Chen.
The new display is comprised of a thin-film transistor (TFT) array. Within it's layer there are millions of tiny capsules of black and white pigments that respond to electrical charge. A negative voltage on the TFT causes white particles to move to the surface while a positive one moves black particles to the top to create the appearance of print.
Fully developed,this display can be in black and white or color. In the current form you can already display images and read books through the screen. The display is, however, currently too slow for video because of the switching speed of the electronic ink, Changing the ink arrangement takes 250 milliseconds, which is sufficient for electronic paper applications but is too slow for video displays.
The display consists of two components. The front part switches according to electronic signals and the back component is a circuit made of transistors that control each individual pixel that composes the display. Each pixel needs a circuit, made of transistors, behind it to switch it. In order to make the display flexible the transistors have to be made on a very thin and flexible substrate.
"In our case it is a very thin stainless steel foil. You need to put a layer of electronic circuits on that foil," Chen said, adding the size can vary from a business card to a computer screen. The current device is too thick to be folded in half but Chen and his team are working on a thinner a version. The current device can be rolled into a cylinder with a diameter of 4 millimeters without compromising its performance
"Our work demonstrated that you can make high-quality electronic circuits on very thin and flexible substrates," added Chen.