Patent ID: 8115805

Claim:
A stereoscopic image display device comprising: a display panel for displaying an image by time-dividing the image into a first image and a second image having parallax between them and sequentially displaying the first image and the second image; a barrier that is located in front of the display panel and includes a first image transmission region for transmitting the first image, and a second image transmission region for transmitting the second image; and a barrier driver for controlling opening and shutting of the first image transmission region and the second image transmission region in synchronization with first input video signals and second input video signals, the first input video signals corresponding to the first image and the second input video signals corresponding to the second image, wherein the barrier driver includes: a video signal input unit for buffering an input video signal from an external device, a reference signal generator for extracting all video signals corresponding to one displayed picture from the input video signal as unit video signals and generating a reference signal for operating the barrier based on the unit video signals, the reference signal being in synchronization with a timing for sequentially displaying the first image and the second image, the reference signal generator comprising a low pass filter for filtering low-frequency components of the input video signal to extract the unit video signals, and a barrier driving signal generator for generating a driving signal for controlling opening and shutting of the first image transmission region and a driving signal for controlling opening and shutting of the second image transmission region based on the reference signal.