Looking for a better solution, the researchers sought lessons from nature. Mimicking themotheye, the new film contains tiny dimples, each 100 nanometres across - about 1,000th the width of a human hair - which cut down reflection.

A self-assembly technique developed by the scientists was used to produce the nanospheres with the required high level of precision.

Co-author Guanjan Tan, another member of the Florida team, said: "Although it is known thatmoth-eye structures can reduce surface reflection, it is relatively difficult to fabricate an anti-reflection film with this nanostructure that is large enough to use on a mobile phone or tablet.

"Because the structures are so small, a high-resolution and high-precision fabrication technique is necessary."

Tests showed that viewed in sunlight, glass covered with the film exhibited a more than four-fold improvement in "contrast ratio" - the different between the brightest white and darkest black.

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Moth eye technology could help you read your smartphone in the sun - Telegraph.co.uk