Transparent display apparatus having screen direction switching function

A transparent display apparatus having a screen direction switching function comprising:

• a transparent display unit comprising glass substrates, each of which is made of a transparent material, and an image output means disposed between the glass substrates in a state of being mounted to inner surfaces of the glass substrates for outputting an image signal;
• a first polarized light source unit disposed at a front of the transparent display unit, the first polarized light source unit being provided at one end thereof with a light emitting diode (LED) lamp, the first polarized light source unit being configured to perform a polarizing function toward the front of the transparent display unit using light emitted from the LED lamp;
• a second polarized light source unit disposed at a rear of the transparent display unit, the second polarized light source unit being provided at one end thereof with a light emitting diode (LED) lamp, the first polarized light source unit being configured to perform a polarizing function toward the rear of the transparent display unit using light emitted from the LED lamp;
• and
• a setting controller for performing control such that the transparent display unit, the first polarized light source unit, and the second polarized light source unit are individually powered on or off, the setting controller being configured to apply control signals to the transparent display unit, the first polarized light source unit, and the second polarized light source unit such that a screen output state in a forward direction or a rearward direction of the transparent display apparatus is set for each mode.