公开(公告)号：US20170153383A1

公开(公告)日：2017-06-01

申请号：US15222104

申请日：2016-07-28

Applicant: Young Lighting Technology Inc.

Inventor： CHIEN-HUI LEE ,  CHING-HSIANG LI ,  CHIN-KU LIU ,  JHONG-HAO WU

IPC: F21V8/00

CPC classification number: G02B6/0076 ,  G02B6/00 ,  G02B6/0026 ,  G02B6/0053 ,  G02B6/0055 ,  G02B6/0068 ,  G02F1/1323 ,  G02F2001/133626

Abstract: A backlight module includes a first surface light source assembly, a second surface light source assembly disposed above the first surface light source assembly, a first optical film disposed above the second surface light source assembly and including a plurality of prisms arranged along a first direction, and a light filter element disposed between the first and second surface light source assemblies. Both of the first surface light source assembly and the second surface light source assembly include a light emitting unit and a light guide plate. Each prism has a tip end facing the second surface light source assembly. The light filter element is configured to allow an incident light ray within a predetermined range of incident angle to pass therethrough. The backlight module can be switched between a narrow viewing angle mode and a wide viewing angle mode. Related driving method and display apparatus are also provided.