Patent ID: 8879025

Claim:
A transparent display device, comprising: a liquid crystal panel; a light source disposed at one side of a lower portion of the liquid crystal panel to emit light; a polarizing plate configured to polarize the light emitted from the light source; a light guide plate disposed at a lower portion of the liquid crystal panel to reflect totally the light polarized in an axis-direction by the first polarizing plate to a lateral surface of the light guide plate to supply the light into the liquid crystal panel, and transmit natural light entered from a lower direction therethrough; and polarizing glasses configured to control an amount of polarized light passing through the light guide plate, wherein the light polarized by the polarizing plate is directly supplied to the liquid crystal panel without a variation of a polarizing state thereof and the polarizing glasses are worn to recognize an image implemented by the liquid crystal panel when a signal is applied to the liquid crystal panel, an un-polarized natural light from a rear side passes the light guide plate to supply directly the un-polarized natural light to the liquid crystal panel to display an objection at a rear side of the liquid crystal panel when the signal is not applied to the liquid crystal panel.