Light guide module having dual reflecting layer wherein light beam being partly absorbed by the first reflecting layer and optical detection device thereof
A light guide module is disclosed in the present invention. The light guide module includes a light guide plate, and an optical reflecting structure disposed on a bottom of the light guide plate. A beam is transmitted into the light guide plate through its side surface. Total internal reflection characters of the light guide plate is interfered by the optical reflecting structure, so that the beam can emit out of the light guide plate through a light emitting surface of the light guide plate. The optical reflecting structure includes a first reflecting layer disposed on the bottom, and a second reflecting layer formed above the first reflecting layer. The beam is absorbed by the first reflecting layer. The beam is reflected out of the light emitting surface via the second reflecting layer, and the second reflecting layer is between the first reflecting layer and the light guide plate.
PixArt Imaging Inc.
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Tien-Chia Hui-Hsuan
Liu Chen