63‐1: Integrated ultra‐thin direct‐lit LCD backlight using glass components

Abstract

In this paper we present the results of development of a backlight in which a single glass plate serves as both a light guide and a core of the printed circuit delivering current to the mini‐LED light sources. The backlight integrates a patterned glass diffuser (PGD) and a glass printed circuit board (GCB). The integrated backlight has the advantages of exceptional thinness, reduced component count and weight, very low thermal expansion, fixed registration, and improved heat dissipation, making it uniquely suitable for portable displays such as those in tablet or laptop computers. An early prototype had a total thickness of 2.5 mm and demonstrated luminance uniformity better than 98.5%. In the future versions, we project that the thickness can be further reduced to 1.5 mm, while keeping all the advantages of direct‐lit backlights including high luminance and local dimming capability.