Samsung Electronics debuted the world's thinnest tablet PC at the Cellular Telecommunications Industry Association show which kicked off in Orlando, Florida on Tuesday.

The new Galaxy Tab 8.9 measures 22.6 cm long and 8.6 mm thick and weighs 470 g. Apple's iPad 2 released early this month is 3 cm longer, 0.2 mm thicker and 131 g heavier.

Samsung Electronics' Galaxy Tab 10.1 (left) and LG Electronics' Optimus Pad

Samsung also showcased a thinner version of the 10.1-inch Galaxy Tab first unveiled in February. Its thickness has been reduced by 2.3 mm to 8.6 mm in only a month.

LG Electronics rolled out its first tablet PC, the Optimus Pad, at the show. It features an 8.9-inch screen and a 1GHz dual-core processor. Running on the Honeycomb version of Google's Android OS, it also includes two cameras that support 3D filming and can be directly connected to a compatible TV. At 12.8 mm, it is thicker than the iPad 2 and the Galaxy Tab 8.9.