Patent ID: 8902223

Claim:
A device for displaying a three-dimensional image, comprising: a display unit to alternately display a left image and a right image on an entire screen; a polarizing unit disposed on a front surface of the display unit to change a polarizing direction of incident light by a horizontal line unit, the polarizing unit including a plurality of horizontal line polarizing modules for changing the polarizing direction of incident light; and a polarizing control unit to control the polarizing direction of a horizontal line of the polarizing unit to be synchronized with a refresh time of the horizontal line of the display unit corresponding to the horizontal line and changed, wherein the polarizing control unit is configured to: receive a vertical synchronizing signal and a horizontal synchronizing signal with respect to the display unit; determine a frame scan start time point from the vertical synchronizing signal; determine a horizontal line scan time point with respect to each horizontal line from the horizontal synchronizing signal; identify a horizontal line which is image-scanned or to be image-scanned based on the determined frame scan start time point and the determined horizontal line scan time point; predict a time point when a specific horizontal synchronizing signal is to be changed using information related to a specific period at which the horizontal synchronizing signal is generated and the frame scan start time point; and control the polarizing direction of the horizontal line polarizing modules of the polarizing unit corresponding to the identified horizontal line to be changed at the predicted time point.