Abstract
AbstractWe describe a backlight system using a newly developed Multi‐Layered Light‐guide (MLL). MLL can perform as a backlight without additional optical sheets such as prism sheets or diffusers. It was developed as a multi‐layer sheet featuring different refractive indexes on different layers. A prototype was built, and the principles were confirmed in comparison with the theory. with a thickness of 0.514 mm, the built prototype is the thinnest backlight in the world, using only MLL without additional optical sheets.
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