Amazon Kindle Layout

 The original Kindle had an off-white plastic casing and an asymmetric, beveled shape, like a closed three-ring binder. It had a rubberized back that makes it easier for users to hold the device. It was 7.5 inches (19 centimeters) long and 5.3 inches (13.5 centimeters) wide, only 0.7 inches (1.8 centimeters) thick and weighed a mere 10.3 ounces.

Since then, Amazon has released many generations and several versions of its popular e-reader. The 10th-generation Kindle, released in 2019, is 6.3 inches long, 4.3 inches wide, and 0.34 inches thick (160 millimeters by 113 millimeters by 8.7 millimeters). It weighs 6.1 ounces (174 grams). The largest model in the lineup, the Kindle Oasis, is 6.3 inches wide by 5.6 inches wide by 0.1 to 0.3 inches thick, (149 millimeters by 141 millimeters by 3.4 to 8.4 millimeters), depending on how much memory is installed. It weighs about 6.6 ounces or 188 grams, again depending on the Kindle's configuration. It costs $250 for the ad-supported version and about $20 more for the version without ads. The software is the same in both and the ads are fairly unobtrusive.

The Paperwhite 3G was released in October 2012, and the Paperwhite itself is in its 10th generation as of 2021 (it was released in 2019). It measures 6.6 inches long by 4.6 inches wide by 0.3 inches thick (167 millimeters by 113 millimeters by 8.2 millimeters). It weighs 6.4 ounces or 182 grams for the WiFi-only model and 6.8 ounces (191 grams) for the cellular-enabled model. It sells for $130 for the ad-supported version, $20 more for the version without ads.

The central feature on all the Kindle models with the exception of the Kindle Fire tablets is the electronic paper screen. The Kindle and Kindle Paperwhite have 6-inch (15-centimeter) screens and the Kindle Oasis has a 7-inch (18-centimeter) screen. The Paperwhite gets its name from its display, which is whiter than the base Kindle display. The lighter screen gives more contrast with the text, making it easier to read than the light gray color of the Kindle's screen. The Oasis also has more contrast than the base Kindle.

There is a Kindle Kids Edition, but it is technologically identical to the regular Kindle. Their screen resolution is 167 pixels per inch (ppi). The Paperwhite and Oasis have almost twice that, with 300 ppi.

All Kindle screens can display images in 16 levels of gray using electronic ink technology. Unlike LCD screens, the Kindle e-reader's screens aren't backlit.

The crispness of the electronic ink screens makes them much easier to read in direct sunlight than devices with color LCD screens. The earliest Kindles required you to use a flashlight if you wanted to read in the dark, but now all of Amazon's e-readers have front-lit screens. A thin sheet of nano-imprinted flattened fiber optic cable distributes the light uniformly over the entire screen, giving the illusion that it is backlit. But since the light is directed toward the screen and not toward your eyes, the Kindle retains its electronic ink advantage of being easy to read. Despite the addition of light, which is usually a big power drain, Kindles keep battery usage at a minimum by using low-powered LEDs as the light source. The basic Kindle uses four LED lights, the Paperwhite has five, and the Oasis has 25.

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