A transparent display panel includes first through (N)-th vertical constant voltage lines (N is a natural number), first through (M)-th horizontal constant voltage line groups (M is a natural number), and a plurality of transparent pixels. The transparent pixels are disposed within a grid defined by the first through (N)-th vertical constant voltage lines and the first through (M)-th horizontal constant voltage line groups. The transparent pixels operate based on constant voltages transferred through the first through (N)-th vertical constant voltage lines and the first through (M)-th horizontal constant voltage line groups. The first through (N)-th vertical constant voltage lines include first vertical constant voltage lines and second vertical constant voltage lines. Each of the first through (M)-th horizontal constant voltage line groups includes a first horizontal constant voltage line and a second horizontal constant voltage line. The constant voltages include a first constant voltage and a second constant voltage.