The IdeaCentre B340 and B345 will come with 21.5-inch, high-definition touch displays. The systems should take full advantage of Windows 8, the first PC OS from Microsoft that makes touch a first-class citizen.

The B340 and B345 will both be priced at US$599 and be available in October, with the release of the new OS. Lenovo is also adding Windows 8 to the IdeaCentre B545, which has a 23-inch touchscreen and has been available since April starting at $699.

With the arrival of Windows 8, Lenovo is now adding touch capabilities to a wider range of all-in-ones. Users will be able to use touch gestures to scroll documents, play games, browse the Web or flip between pictures and movies. Several vendors have announced touchscreen laptops with Windows 8, but the larger screens on the all-in-ones should make them more convenient for touch use.

The new systems have 10-point touch capabilities, meaning up to 10 fingers can be used at the same time on the screen. Chip options include third-generation Intel Core i7 processors code-named Ivy Bridge or Advanced Micro Devices quad-core processors code-named Trinity. Graphics cards are optional; users can select Nvidia GeForce 615 with the B340, or AMD's Radeon HD7470A with the B345 and B545 all-in-ones.

An optional TV tuner card is also available for watching TV.