A stereoscopic image display can include an optical cell and a display panel including pixels defined by first and second short sides extended in a first direction, and first and second long sides extended in a second direction perpendicular to the first direction; and apertures defined by first and second sides parallel to the first long side, and third and fourth sides parallel to each other, in which the third side is inclined with a first predetermined angle between the first short side and the third side, the fourth side is inclined with a second predetermined angle between the first long side and the third side, a ratio of a length of the first short side to a length of the first long side is 1:2, and a ratio of a length of the first side to a length of the first long side is 1:2.