公开(公告)号：US20250130447A1

公开(公告)日：2025-04-24

申请号：US18405521

申请日：2024-01-05

Applicant: Meta Platforms Technologies, LLC

Inventor： Guohua Wei ,  Peter Topalian ,  Min Chul Shin ,  Risheng Cheng ,  Zhujun Shi ,  Zhaoning Yu ,  Jonathan Robert Peterson ,  Zhimin Shi ,  Giuseppe Calafiore ,  Heqing Huang

IPC: G02F1/03 ,  G02B27/01 ,  G02F1/035 ,  G02F1/21

Abstract: In some examples, a device may include a backlight unit configured to illuminate a display. In some examples, a light source may direct light into an active photonic circuit. The active photonic circuit may include optical switches controllable to distribute the light to illuminate display zones. An active photonic circuit may include an arrangement of optical switches configured to allow particular zones to be raster scanned, for example, using light distribution and outcoupling further using a passive photonic circuit. The illumination intensity for each zone may be controlled using the optical switches and/or with variation of the light source intensity. In some examples, the illumination intensity for each zone can be varied based on the displayed content, allowing improved contrast ratios. In some examples, all zones may be illuminated simultaneously with a zonal illumination intensity based on displayed content. Other devices, methods, systems, and computer-readable media are also disclosed.