The principle of polarized 3D display is introduced.To deduce the principle of the parallax resulted from polarized 3D display by using Jones matrix

the most accurate retardation value is obtained finally. A kind of compensation film with the negative wavelength dispersion property is applied to the polarized 3D display. In this paper

there are two polarizers and two compensation films composited in the optical system to imitate the parallax pheno-menon made by polarized 3D display. The transmission of the test system can be measured by UV-2450

and the retardation value and the wavelength dispersion property of the compensation film can be measured by the RETS-100. With applying the compensation film with negative wavelength dispersion

the polarized 3D display will produce a better parallax so that there will be less or no demands on the watching pose

which makes more convenient for users as well as the good 3D display performance.