| 摘要 |
Display backlights arranged in an environment with an optical index n1 such as air. The display backlight includes a transparent plate with an optical index n2 higher than n1, the plane is delimited by two parallel plane surfaces and by a peripheral edge. The display backlight also includes a light source coupled with the peripheral edge such that the rays emitted by the source penetrate into the plate and are propagated inside the plate between the two surfaces mainly by total internal reflections. The display backlight further includes a layer made of a transparent material arranged in optical contact with a plane of the plate, the material of the plane having an optical index n3 higher than n1.
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