Transparent display device including a light guide plate having light sources at both lateral surfaces and formed with a plurality of concave patterns at the lower surface thereof

摘要

Disclosed is a transparent display device including a light guide plate formed with a plurality of concave patterns at the lower surface thereof to totally reflect polarized light entered in a lateral direction while transmitting natural light entered from a lower direction therethrough; a light source disposed in a lateral direction of the light guide plate to emit visible light including first and second polarized lights; a first polarizing plate disposed at a lateral portion of the light guide plate to transmit either one of the first and second polarized lights through the light guide plate; a liquid crystal panel for driving liquid crystals to change the phase of the polarized light; and a second polarizing plate for controlling an amount of the polarized light according to the changed phase of the polarized light.

主权项

1. A transparent display device, comprising:
a light guide plate with a plurality of concave patterns at the lower surface thereof having an inclined cross-section to totally reflect polarized light entered in both lateral directions while transmitting natural light entered from a lower direction therethrough; a first and a second light source in both lateral directions of the light guide plate to emit visible light including a first and a second polarized light; a first and a second polarizing plate at both lateral surfaces of the light guide plate to transmit either one of the first and second polarized lights through the light guide plate; a liquid crystal panel arranged directly above an upper surface of the light guide plate, wherein no polarizer is located between a first substrate of the liquid crystal panel and the light guide plate, and wherein the liquid crystal panel drives liquid crystals to change the phase of the polarized light; and a third polarizing plate on a second substrate at an upper portion of the liquid crystal panel having a first substrate and the second substrate, the third polarizing plate being arranged to control an amount of the polarized light according to the changed phase of the polarized light.