Barnes & Noble introduced two Nook tablets with 7-inch and 9-inch high-resolution displays this morning, targeting entire families with the devices.

The Android devices will ship in the US in late October and be available in stores in early November, with preordering starting today at the bookseller's stores and on the Nook online store, the company said. In the UK, preorders will begin in late October, with availability in late November.

The 7-inch tablet called Nook HD offers resolution of 1440 x 900, offering 243 pixels-per-inch and HD video playback of up to 720p. Positioned as a reading and entertainment tablet, it is available in two colours "Snow" and "Smoke." At 315g and 5 inches wide, it runs a dual-core 1.3GHz processor, and has 1GB of RAM.

Barnes & Noble Nook HD+

The device will retail at £159 for an 8GB model and £189 for the 16GB version, both featuring expandable microSD memory storage.

The NOOK HD+ offers a HD 9-inch display with resolution of 1920 x 1280 and 256 pixels-per-inch for up to 1080p video, according to Barnes & Noble. Weighing 515g the 9-inch tablet has a 1.5GHz dual-core processor with 1GB of RAM. Offered in the colour "Slate," it is priced at £229 for 16GB and £269 for a 32GB version.

Barnes & Noble said that there is big demand from customers for a very light and high quality 9-inch tablet at half the price of the iPad.

More than 50% of tablet owners share their devices with others in their family every day, according to Barnes & Noble. A new Nook Profiles feature allows each user in the family to get access to his own content on the Nook, without peeking into content of other family members.

Barnes & Noble said its forthcoming video service, Nook Video, will be available on the new devices.