A stereoscopic image display device displays a stereoscopic image by generating stereoscopic image data based on 3D graphics data. The stereoscopic image display device includes a display unit for displaying an image, a driver, and a controller. The controller receives a synchronization signal, the 3D graphics data, and a user selection parameter for modifying a stereoscopic effect level, and outputs a control signal based on the synchronization signal and a stereoscopic image data signal, which is generated by combining left eye image data and right eye image data generated through performing matrix operations on the 3D graphics data and the user selection parameter, to the driver. The driver drives the display unit based on the control signal and the stereoscopic image data signal to display the stereoscopic image on the display unit. |