Electronic device with thermally matched light guide plate

摘要

Electronic device backlight structures may be used to provide backlight for a display. The backlight structures may include a light source such as an array of light-emitting diodes. Light from the light source may be coupled into an edge of a light guide plate. The light guide plate may distribute the light laterally across the display. The light guide plate and other display structures may be mounted in an electronic device housing such as a metal housing having metal housing walls. A gap may separate an edge of the light guide plate from the metal housing walls. Mismatch between the coefficients of thermal expansion of the housing and the light guide plate may be minimized to minimize the size of the gap. The light guide plate may be formed from a layer of glass with printed light-scattering structures or from polymer with a filler and molded or printed light-scattering structures.

主权项

1. A display, comprising:
display layers configured to display an image; and a backlight that provides light for the display layers, wherein the backlight includes a light source and a light guide plate that receives the light from the light source, wherein the light guide plate is formed from a polymer and a filler in the polymer, wherein the polymer has a coefficient of thermal expansion, wherein the light guide plate has a coefficient of thermal expansion, wherein the filler is configured to reduce the coefficient of thermal expansion of the light guide plate to less than the coefficient of thermal expansion of the polymer, and wherein the filler reduces the coefficient of thermal expansion of the light guide plate to match a coefficient of thermal expansion of a housing in which the display is mounted.