Plastic-based TFTs allow the end product to be substantially lighter and thinner than products using glass-based TFTs. In addition, glass-based TFTs can be fragile; use of plastic-based TFTs can result in a more rugged end product with less breakage in the electronics due to drops or stress tension. Bi-Stable No power needed to hold an image. Traditional Paper.
But when the bottom electrode creates both positive and negative electric fields, a mixture of black and white pigment is pushed to the surface of the capsule, resulting in a shade of gray that can be darker or lighter depending on how much white and black is on display for that pixel.
Unlike an LCD display, which requires constant power to keep the contents of the display on screen, E-Ink only requires power to change the polarity of electrodes on a per-region basis. This means that your e-reader only uses power when it turns pages, and that's how an e-reader can last for up to one month on a single charge.
E-Ink devices can reduce power consumption even more by only changing the pixels that need to be changed per page turn. In other words, if a particular pixel stays black from one page to the next, nothing needs to be changed and no power needs to be expended.
However, over time, some pixels may become stuck and refuse to change even with a new polarity, and this results in an imprint of text which stays even after the page has been turned. This phenomenon is known as "ghosting" and is usually fixed by a full-page refresh.
That's why every so often the screen flashes completely black, then white, then back to the page. E-Ink's reflective nature makes it perfect for reading in bright light, but because it can't emit any light by itself, it can't be read in the dark. In earlier models, reading in the dark meant using a lamp or some other external light source, just as you would with a regular paper book. Nowadays, upmarket e-readers have a built-in lighting feature which lets you to read in the dark.
Lighting is also useful during the daytime when you need to adjust contrast. Rather than using a backlight, most e-readers actually use LEDs mounted along the inner sides of the display that shine light across a thin layer of translucent plastic. This distributes the light evenly across the surface and makes the entire page legible. Long story short, this means that you can read in the dark without straining your eyes as you would on a light-emitting screen like your smartphone or tablet.
Of course, extra energy is needed to power these built-in lights, so be aware that you will noticeably reduce the overall battery time of the device. Instead of four weeks per charge, you might get around two weeks per charge. E-Ink is the technology that gives your e-reader its fantastic viewing angles, readability in bright sunlight, and incredible battery life. With added lighting built into the device, it even lets you read at night without ruining your eyes. The ink's flexibility would also make it possible to develop roll-up displays for electronic devices.
Another advantage electronic ink has over traditional computer displays is its readability. It looks more like printed text, so it's a lot easier on the eyes. However, both Xerox and E Ink have to improve the resolution of their products for them to be viable in book or other small-print publications. Xerox has already made a display that has a dots per inch dpi resolution, which is more than twice the resolution of an average LCD display. Lucent's printable transistors should allow E Ink to increase the resolution of its products to resemble the resolution of a printed book.
The developers of electronic ink don't expect people to throw all paper out or discard their computer monitors the instant these products hit the market. Instead, electronic ink will initially co-exist with traditional paper and other display technologies.
In the long run, electronic ink may have a multibillion dollar impact on the publishing industry. Sign up for our Newsletter! Mobile Newsletter banner close. Mobile Newsletter chat close. Mobile Newsletter chat dots. Mobile Newsletter chat avatar. Mobile Newsletter chat subscribe. High-Tech Gadgets. How Electronic Ink Works. By: Kevin Bonsor.
Making Electronic Ink " ". Here you can see how E Ink's pigment chips would react to positive and negative charges.
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