Kindle Until recently, pretty much all e-readers used E-Ink displays like the ones in Amazon's Kindle and Barnes & Noble's Nook. However, at CES we've seen a number of concept designs and prototypes that are billed as e-readers but use LCD screens like the ones in typical notebooks. Are these devices truly e-readers?

The whole point of electronic paper-based e-readers is that the display, which doesn't use a backlight, mimics the look of physical paper and is easier on the eyes than a bright, backlit LCD. I saw many LCD 'e-readers' at the show, but none had those same qualities.

Technology companies are as susceptible to trends as teenage girls, and I'd argue that many of the companies making LCD-based e-readers are simply jumping on the bandwagon. Many of these so-called e-readers are no more than tablet PCs or MIDs (mobile internet devices), capable of displaying e-books with e-reader software but not really optimised for that purpose.

It's no different, really, from a mobile phone running Amazon's Kindle app, or any other e-reader software for that matter. The only difference between the two categories is the size of the screen.

CES news

Much of the hype is just that. After all, this is CES - the place where companies go to put forth ideas and gauge the reception from the media and potential customers.

MSI's dual-screen e-reader/netbook

Which brings me around to the MSI 10in dual-screen e-reader concept. The clam-shell prototype device was surprisingly lightweight in my hands, and had a touchscreen that made it easy to navigate around the Windows 7 starter operating system. The screens responded to being reoriented from the vertical position to horizontal; in horizontal mode, the unit has a virtual keyboard with haptic feedback.

The prototype is intriguing, to be sure, but, MSI has no plans to bring it to market, and according to a product manager, the product won't be manufactured until at least 2011. Ditto for the company's other concept display, a half-inch-thick (give or take) tablet 'e-reader' with touchscreen, running Google Android. Both devices ran e-reader software, had LCD screens, and used full operating systems. They were capable of far more than many traditional e-readers, but will they be suitable if what you really want is a device primarily to read novels on your commute?

Entourage eDge Other e-readers, such as the Entourage eDge and the Spring Designs Alex Reader, also include multi-purpose LCD screens. But in addition, they have E-Ink displays of equal or greater size that the manufacturers intend for use as the primary reading display.

While many of the tablet devices and MIDs introduced at CES look promising, none appear ready to replace electronic paper for proper reading. When the sun set in Vegas, they're still just small PCs that let you access electronic books, along with doing a whole lot of other stuff.

See also:

CES: COOL-ER unveils new e-book readers

CES: MSI netbook has two touchscreens

Sales of e-readers to surge in 2010

Barnes & Noble Nook review

Amazon Kindle 2 review

Free Amazon Kindle for iPhone comes to the UK

PC World