Abstract— A backlight system using a newly developed multi‐layered lightguide (MLL) is described. The MLL can function as a backlight without additional optical sheets such as prism sheets or diffusers. It was developed as a multi‐layered sheet featuring different refractive indexes for different layers. A prototype was built, and the principles were confirmed by comparison with theory. With a thickness of 0.414 mm, the prototype is the thinnest backlight in the world, using only a MLL and a reflector.

We have developed a new stylish TFT‐LCD. We located gatedriver monolithic circuits in the pixel area. As there are no electronic circuits in the frame area, we can realize a narrow border and round corners or a multi‐concave shape, and the frame shape can be easily revised.

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