E-ink screens with backlight



We already know two the most important advantages of E-ink screen - energy consumption is very low and there is no inner glow which irritates eyes. It can be seemed that because of backlight of the screen all advantages should disappear. But it is not quite so. Let's descry the history of appearance of the screens with function of backlight.

One of institutes of USA held researches and their results shown that sprouses in many families don't sleep together as at the time when one of them wants to sleep another one wants to read a book. This fact has become a premise to making of E-ink screen with backlight. So the function of backlight was made first, for not very long reading in the darkness and second, for reading with a small level of backlight in rooms with not very good illumination.

TFT and E-ink technology with backlight

It wasn't easy to invent such screen. It's known that displays made by technologies IPS and TFT have transparent screens and matte screen substrate (light guide), which evenly distributes light is lighted with help of fluorescent lamps or LEDs. Screens which are made by E-ink technology are not transparent, so it's useless to light them in such way. In this case, the light source should be situated above the screen and the light should spead almost parallel to screen how it usually happens when the car is lighting the road by headlights. Hence, immediately arises problem of providing the uniformity of lighting of the screen.

Backlight function in Amazon Kindle Paperwhite

An American corporation Amazon was the first who offered a variant of solving this problem in a model Amazon Kindle Paperwhite. The lightning is made by four LEDs. They're situated at the bottom of the e-book and light not the screen but the transparent plate, which covers it. You can not only turn on and off the backlight but also manage it in very big limits.

Backlight function in NOOK Simple Touch with Glowlight

After Amazon, a reader with backlight was made by American company Barnes & Noble (the model NOOK Simple Touch with GlowLight). The backlight is made by 8 LEDs which are situated at the top of the e-book and instead of the transparent plate there is a special light diffusing layer. If you're buying this book - be careful, as you can scratch the layer.

Then, the function of backlight began to appear from many manufacturers and technology of production of them was not different from Kindle or Nook.

Backlight function in SONY PRS-T3


But company Sony has chosen completely different way and it continues producing e-books without backlight. Sony equiped the cover of its' book with a special retractable flashlight, which is powered from battery of reader.

It should be noted that the backlight effect on battery consumption and reduces battery life from several weeks to 10 - 30 hours. Naturally, this mode is not designed for constant use.

View models of electronic books with backlight function can be in the table of parameters, and learn more about the models E-ink screens you can in the article "Screen Types of e-books".


The Poll of E-ink-reader
Should an e-reader have backlight?
Should
Shouldn't
It leaves me indifferent



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What to read?

Yann Martel "Life of Pi". After the tragic sinking of a cargo ship, one solitary lifeboat remains bobbing on the wild, blue Pacific. The only survivors from the wreck are a sixteen-year-old boy named Pi, a hyena, a zebra with a broken leg, a female orang-utan - and a 450-pound Royal Bengal tiger. Since it was first published in 2002, Life of Pi has entered mainstream consciousness and remains one of the most extraordinary works of fiction in recent years.

What to read?

Jean Kwok "Mambo in Chinatown". Twenty-two-year-old Charlie Wong grew up in New York’s Chinatown, the older daughter of a Beijing ballerina and a noodle maker. Though an ABC (American-born Chinese), Charlie’s entire life has been limited to this small area. Now grown, she lives in the same tiny apartment with her widower father and her eleven-year-old sister, and works—miserably—as a dishwasher...

Stephen King "Mr Mercedes". A cat-and-mouse suspense thriller featuring a retired homicide detective who's haunted by the few cases he left open, and by one in particular - the pre-dawn slaughter of eight people among hundreds gathered in line for the opening of a jobs fair when the economy was guttering out. Without warning, a lone driver ploughed through the crowd in a stolen Mercedes. The plot is kicked into gear when Bill Hodges receives a letter in the mail, from a man claiming to be the perpetrator. He taunts Hodges with the notion that he will strike again. Hodges wakes up from his depressed and vacant retirement, hell-bent on preventing that from happening...

To find these books, check out the "e-library".



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