by Chris Cui
Published Tue, May 16th 2017, 08:08 | Technology
Apple iPad’s most striking feature, its gorgeous 9.7-inch touchscreen display, uses liquid crystal display technology — but with a few unusual twists — to present a vivid image and a wide viewing angle. At the same time, it offers a better picture quality than conventional LCDs.” The lightweight device (1.5 pounds) features a luminous touchscreen and a user interface similar to the iPhone.
So-called twisted nematic LCDs have dominated consumer laptop and phone displays. The viewing angle on these screens is limited, ranging from 110 to 120 degrees. When the screen is viewed outside this optimal range, its colors can look “off” and the overall image is faded or invisible. In IPS LCD screens, the crystal molecules are oriented so their motion is parallel to the panel, instead of perpendicular to it. For viewers, the result is a very wide viewing angle — up to 180 degrees — with brilliant color.
The iPad’s screen, though, doesn’t have a wide aspect ratio, which is unusual in the TV-display world, says research firm DisplaySearch. Instead of a 16:10 or 16:9 aspect ratio, the iPad screen uses a 4:3 ratio. The iPad display has some other interesting features. It is arsenic- and mercury-free and has a fingerprint-resistant oleophobic coating, which Apple had introduced in the iPhone 3G S. The iPad’s 1024 x 768 display resolution, at 132 pixels per inch, has chunkier pixels than the iPhone 3G S, which has a smaller display but a resolution of 163 pixels per inch.
The biggest disappointment for tech enthusiasts is the lack of an OLED screen option in the iPad. That should be no surprise, say DisplaySearch and iSuppli. Display manufacturers just don’t have the fabrication capacity to create large quantities of big OLED displays. Though Apple showed the iPad’s potential as an e-book reader, iSuppli and DisplaySearch remain skeptical about it. LCD screens, even in black-and-white mode, get washed out in bright sunlight. And if users turn on the backlight to improve the contrast, they are likely to draw down the device’s battery. On top of that, reading on an LCD means you’re staring into a light source, which produces more eyestrain than reading words by reflected light, as you do with printed pages or E Ink displays like those used in the Kindle.
The great thing about touchscreen technology is that it's incredibly easy for people to use. Touchscreens can display just as much information (and just as many touch buttons) as people need to complete a particular task and no more, leading people through quite a complex process in a very simple, systematic way. That's why touchscreen technology has proved perfect for public information kiosks, ticket machines at railroad stations, electronic voting machines, self-service grocery checkouts, military computers, and many similar applications where computers with screens and keyboards would be too troublesome to use.
All of us with smartphones (modern cellphones), eBook readers, and tablet computers are now very familiar with touchscreen technology. Back in 2008, Microsoft announced that touch technologies would feature prominently in future versions of the Windows operating system—potentially making computer mice and keyboards obsolete—but almost a decade later, most of us are still locked into our old-style computers and operating systems, and the old ways of using them. Though it could be a while before we're all prodding and poking our desktop computers into action, touchscreen technology is definitely something we'll be seeing more of in future!
The future of touch interfaces really has some cool stuff going on. Recently Apple introduced 3D touch technology to some of its devices. This lets the screen also detect the amount of pressure that your finger or stylus is exerting. Obviously this allows for a whole new way to interact with software.
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