Showcase and method of driving the same

A showcase comprising:

• a lower plate having a square plate form and having a control board disposed therein;
• a transparent display panel configured to stand up at the front over the lower plate;
• a pair of transparent members configured to stand up on two facing sides over the lower plate;
• a back cover configured to be open or shut at the back over the lower plate;
• and
• an upper plate configured to face the lower plate, to cover an internal space confined by the transparent display panel, the pair of transparent members and the back cover and to have a lighting device electrically connected to the control board,
• wherein the control board may operate to turn on the lighting device in response to an operation signal of the transparent display panel, calculate an average intensity of illumination of an image displayed on the transparent display panel, calculate a difference between the calculated average intensity of illumination and a reference value, and control intensity of illumination of the lighting device based on the difference.