POLARIZATION SYSTEM AND THREE DIMENSIONAL IMAGE DISPLAY APPARATUS HAVING THE SAME
A polarization system including a first polarization film, a second polarization film, and a first retardation film disposed between the first and second polarization films. The first polarization film is disposed between a user and a light irradiator and the second polarization film is disposed between the first polarization film and the light irradiator. In addition, the first retardation film retards a phase of the light passing through the first polarization film. Thus, the polarization system allows the user to watch a 3D image without being related to the user's posture. A second retardation film may also be disposed between the first polarization film and the first retardation film.
1 . A polarization system comprising:
a first polarization film configured to be disposed between a viewer and a light irradiator;
a second polarization film configured to be disposed between the first polarization film and the light irradiator; and
a first retardation film configured to be disposed between the first polarization film and the second polarization film and configured to retard a phase of light exiting from the first polarization film.
2 . The polarization system of claim 1 , wherein the first polarization film and the second polarization film are configured to linearly polarize light incident thereto.
3 . The polarization system of claim 2 , wherein a retardation variation produced by the first retardation film is about λ/4 and the first retardation film circularly polarizes the light passing therethrough.
4 . The polarization system of claim 3 , further comprising a second retardation film configured to be disposed between the first retardation film and the first polarization film.
5 . The polarization system of claim 4 , wherein a retardation variation produced by the second retardation film is about λ/4 and the second retardation film linearly polarizes the light passing therethrough to be substantially parallel to a transmission axis of the first polarization film.
6 . The polarization system of claim 1 , wherein a retardation variation produced by the first retardation film is more than λ/4.
7 . The polarization system of claim 6 , wherein the retardation variation (Δ) produced by the first retardation film is represented by the following Equation,
Δ=( n x −n y )× d
where, when a direction substantially parallel to a surface of the first retardation film is referred to as an x-axis and a direction substantially perpendicular to the surface of the first retardation film is referred to as a y-axis, “n x ” denotes a refractive index in an x-axis direction, “n y ” denotes a refractive index in a y-axis direction, and “d” denotes a thickness of the first retardation film.
8 . The polarization system of claim 6 , wherein the first retardation film comprises polyethylene terephthalate.
9 . The polarization system of claim 8 , wherein the first retardation film has a thickness equal to or smaller than 1500 nm.
10 . A 3D image display apparatus comprising:
a display panel configured to display a left-eye image and a right-eye image separately; and
a polarization system configured to be disposed adjacent to a surface of the display panel, on which the left and right images are displayed, to allow a viewer to perceive a 3D image, the polarization system comprising:
a first polarization film configured to be disposed between the viewer and the display panel;
a second polarization film configured to be disposed between the first polarization film and the display panel; and
a first retardation film configured to be disposed between the first polarization film and the second polarization film to retard a light exiting from the first polarization film.
11 . The 3D image display apparatus of claim 10 , wherein the first polarization film and the second polarization film are configured to linearly polarize the light incident thereto.
12 . The 3D image display apparatus of claim 11 , wherein a retardation variation produced by the first retardation film is about λ/4 and the first retardation film is configured to circularly polarize the light passing therethrough.
13 . The 3D image display apparatus of claim 12 , further comprising a second retardation film configured to be disposed between the first retardation film and the second polarization film.
14 . The 3D image display apparatus of claim 13 , wherein a retardation variation produced by the second retardation film is about λ/4 and the second retardation film linearly is configured to polarize the light passing therethrough to be substantially parallel to a transmission axis of the first polarization film.
15 . The 3D image display apparatus of claim 10 , wherein a retardation variation produced by the first retardation film is more than λ/4.
16 . The 3D image display apparatus of claim 15 , wherein the retardation variation (Δ) produced by the first retardation film is represented by the following Equation,
Δ=( n x −n y )× d
where, when a direction substantially parallel to a surface of the first retardation film is referred to as an x-axis and a direction substantially perpendicular to the surface of the first retardation film is referred to a y-axis, “n x ” denotes a refractive index in an x-axis direction, “n y ” denotes a refractive index in a y-axis direction, and “d” denotes a thickness of the first retardation film.
17 . The 3D image display apparatus of claim 15 , wherein the first retardation film comprises polyethylene terephthalate.
18 . The 3D image display apparatus of claim 17 , wherein the first retardation film has a thickness equal to or smaller than 1500 nm.
19 . The polarization system of claim 6 , wherein the first retardation film is configured to elliptically polarize the light passing therethrough.
20 . The 3D image display apparatus of claim 15 , wherein the first retardation film is configured to elliptically polarize the light passing therethrough.
21 . The polarization system of claim 1 , wherein the first retardation film is disposed directly on the second polarization film, and the first polarization film is configured to be spaced apart from the first retardation film.