LIGHT EXTRACTING DIFFUSIVE HOLOGRAM FOR DISPLAY ILLUMINATION

摘要

This disclosure provides systems, methods and apparatus for illumination, such as for illuminating displays, including reflective displays. An illumination device may include a light-extracting, diffusive holographic medium. The holographic medium may be a holographic film and may be disposed on the surface of a light guide, and includes a hologram that both extracts light out of the light guide and diffuses this extracted light for propagation towards the display elements of the display. The hologram can extract light by redirecting light, which is propagating within the light guide, so that the light propagates out of the light. The diffusion occurs upon the light being redirected, as the hologram redirects the light towards the light guide in a controlled range of angles.

主权项

1. A display system, comprising:
an array of reflective display elements; and a front light disposed forward of the array of reflective display elements, the front light comprising:
a light guide; anda hologram, the hologram configured to:
redirect light propagating within the light guide out of the light guide and towards the array of reflective display elements; anddiffuse the redirected light upon being redirected towards the array of reflective display elements.