Los Angeles' education board has voted to restrict student screen time in classrooms, making it the first major US school system to do so.

The resolution requires staff to develop screen-time policies based on grade level and bans first-grade and younger students from using devices.

It comes as the district, which serves about half ​a million students, sought to reduce its reliance on tablets and laptops, which was prompted by the Covid-19 pandemic.

Nick Melvoin, a board member who brought forward the resolution, said student devices were a "lifeline" in 2020, but that "years later, it's time that we reset".

"I believe that we have the opportunity to lead the nation, to establish comprehensive, developmentally grounded screen-time limits that puts students before screens," Melvoin said at a meeting on Tuesday.