PARIS, United States — L'Oreal, the world's biggest cosmetics company wants to see more beauty tech like sensory hair brushes that tell you how to care for your hair, and skin patches that let you know how much sun you are getting.

So it said on Friday it was launching a programme of start-up collaborations in Paris as it ramps up digital investments and seeks out new beauty products like its "smart" hairbrushes.

L'Oreal makes an ever greater slice of sales online and has rolled out services and items for tech-savvy consumers, such as a phone app for virtual make-up tests.

The French group said it was looking to develop more inventions at a site for start-up companies in Paris, where 10 to 12 firms will work on projects with L'Oreal every year.

"The world of beauty has already become very digitalised ... this will allow us go even further than what we do today," L'Oreal chairman and chief executive Jean-Paul Agon said, at a reconverted 1920s railway depot in Paris that now houses a start-up campus.

Known as "Station F" and launched by billionaire businessman Xavier Niel, it will now have a L'Oreal workshop.

Agon did not say how much L'Oreal had invested so far in start-up ventures and online development, but said the group's budget for all things digital was growing fast.

L'Oreal now spends 35 percent of its media budget on digital campaigns and had recruited 1,700 people to work in this area, he said. Five years ago staffing in this section was closer to 150.

L'Oreal derives about 7 percent of its revenues — which totalled €13.4 billion ($15.8 billion) in the first half of the year — from online sales, up from just over 5 percent in 2015. It has not disclosed online growth targets.

The company has already invested in London's Founders Factory, a so-called start-up incubator, last year, and it has its own innovation programme in San Francisco.

Products developed there include an electronic UV skin patch that measures exposure to the sun.

Aside from seeking new technology, such as developments in artificial intelligence or voice recognition software, L'Oreal will also work with start-ups developing new beauty products, be it creams or make-up, the company said.

L'Oreal's push comes as Paris seeks to overtake London as a leading European tech centre for investors and inventors, in a "start-up nation" championed by France's pro-business president Emmanuel Macron.

"We're also happy to be contributing to that project," Agon said. L'Oreal is France's fourth-largest listed company.

By Sarah White; Editors: Dominique Vidalon, Jeremy Gaunt