Google Inc said more than 100,000 smartphones running on its Android mobile operating system are now activated daily and its library of applications has grown to 50,000, underscoring rapid adoption of the devices.

The Internet search and advertising leader said on Thursday that searches on its mobile Internet search engine have quintupled in just the past two years.

At its annual developer's conference, Google executives outlined how the Android -- an operating system introduced last year in competition with Apple Inc's and Palm Inc PALM.O> -- is gaining traction in the intensely competitive market.

Later on Thursday, Google, Intel Corp and Sony Corp are expected to announce a joint effort to develop Web-connected televisions for households.

The tie-up may extend Google and Intel's reach beyond the personal computer and into the roughly $70 billion television broadcasting ad market. Sony, whose erstwhile dominance in consumer electronics has been eroded by the likes of Samsung, could beat rivals to a potentially new generation of devices.

The multi-pronged effort will mark the latest attempt to bring the Internet to the living room, a vision that has attracted and challenged virtually every major player in the technology and consumer electronics industry for years, from Apple to Microsoft Corp.

(Reporting by Alexei Oreskovic; editing by Andre Grenon)