Display device and three dimensional image filter

PURPOSE: A display device and 3D image filter are provided to polarize linear polarization to right and left circular polarization through polarizing natural light emitting from a display panel to the linear polarization by installing a linear polarization layer and a phase difference layer. CONSTITUTION: A display panel(100) is provided to a left eye image and a right eye image. A linear polarization layer(210) is installed in the front side of the display panel. The linear polarization layer polarizes natural light of the display panel to linear polarization. A phase difference layer(220) is installed in the linear polarization layer. The phase difference layer polarizes the linear polarization to left circular polarization and right circular polarization corresponding to the left eye image and the right eye image respectively.