Mr Williamson said the devices would be delivered to schools.
He also pledged to publish a remote education framework to support schools and colleges with delivering lessons during the latest national lockdown.
It comes as research says children from poorer families are likely to struggle more with remote learning.
The Department for Education said its data showed that over 700,000 devices had been delivered to schools in England so far during the pandemic - 100,000 of which were delivered last week.
