Patent ID: 8836889
Filing Date: 2014-09-16
Classification: G02B,G02F

Abstract:
1. A transparent display device, comprising: 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 a first and a second polarized light; 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 to the light guide plate; a liquid crystal panel arranged directly above an upper surface of the light guide plate without any intervening structure between a first substrate of the liquid crystal panel and the light guide plate, wherein the liquid crystal panel drives liquid crystals to change the phase of the polarized light; and a second polarizing plate on a second substrate of the liquid crystal panel, the second polarizing plate being arranged to control an amount of the polarized light according to the changed phase of the polarized light, wherein the natural light is entered from a lower surface of the light guide plate, and at this time the natural light is entered to the liquid crystal panel via a portion between the concave patterns of the light guide plate so that the transparent display device is maintained at a transparent state regardless of whether or not being displayed by the natural light and an object located at a lower portion of the light guide plate is allowed to be viewed by the user at the front side, wherein intervals D wherein the plurality of concave patterns have an oval-shaped structure, and the concave patterns formed in the first region (P