a transparency adjusting apparatus is provided . the transparency adjusting apparatus includes : a first transparent shell ; a heater disposed on the first transparent shell ; and a second transparent shell disposed on the first transparent shell , wherein the first transparent shell and the second transparent shell are sealed to define a sealed space for containing a working fluid therein and the working fluid absorbs heat from the heater and evaporates to condense on the second transparent shell , thereby adjusting the transparency of the second transparent shell .