PC giant Hewlett-Packard (HP) would start selling its WebOS 3.0-based tablet PC, TouchPad in April with shipments to start delivery by the end of March, Digitimes reported citing sources from HP's upstream component partners.

HP internally is aiming to ship 45-48 million notebooks and tablet PCs combined in 2011, the sources added.

In 2011, HP is expected to ship TouchPad series product in a range of 4-5 million units.

Sources also noted that HP might have great difficulties to regain its pace in the tablet PC market in the future if it fails to challenge Apple's iPad. The primary reason cited for this is HP's adoption of panel that supports 1024 by 768 with aspect ratio of 4:3 for its tablet PC, different from most of Android's 16:10 design.