Display device

1. A display device that satisfies the following Formula 1 and that comprises:

a displaying part comprising a region for generating a signal for a right eye, configured to generate the signal for the right eye; a region for generating a signal for a left eye, configured to generate the signal for the left eye; and a first light-penetration-controlling region that is adjacent to the regions for generating the signals for the right eye and the left eye; and

a filtering part comprising a polarization state-controlling region that comprises a region for controlling the polarization state of a signal for a right eye in a position into which the signal for the right eye can enter, and a region for controlling the polarization state of a signal for a left eye in a position into which the signal for the left eye can enter; and a second light-penetration-controlling region that is adjacent to the regions for controlling the polarization states of the signals for the right eye and the left eye:

H 1 +H 2 ≦( P L +P R )/2  [Formula 1]

wherein H 1 and H 2 are the widths of the first and second light-penetration-controlling regions, respectively, and P L and P R are the widths of the regions for controlling the polarization states of the signals for the left eye and the right eye, respectively.

2. The display device of claim 1 , wherein the light transmittances of the first and second light-penetration-controlling regions are in the range from 0% to 20%, respectively.

3. The display device of claim 1 , wherein the displaying part further comprises an image-generating region comprising the regions for generating the signals for the right eye and the left eye, and also comprises a first polarizing plate and a light source that are positioned sequentially from one side of the image-generating region.

4. The display device of claim 1 , wherein the first light-penetration-controlling region comprises chromium, a double layer of chromium and chromium oxide, a resin layer comprising a pigment, carbon black or a graphite.

5. The display device of claim 1 , further comprising a second polarizing plate positioned between the displaying part and the polarization state-controlling region.

6. The display device of claim 1 , wherein the second light-penetration-controlling region is positioned between the regions for controlling the polarization states of the signals for the right eye and the left eye.

7. The display device of claim 5 , wherein the second light-penetration-controlling region is positioned between the second polarizing plate and the polarization state-controlling region and also is positioned so as to be overlapped with at least a part of the region for controlling the polarization state of the signal for the right eye or the left eye.

8. The display device of claim 5 , wherein the second light-penetration-controlling region is positioned so as to come in contact with the second polarizing plate's side which is an opposite side to the second polarizing plate's side coming in contact with the polarization state-controlling region or the displaying part, and also positioned so as to be overlapped with at least a part of the region for controlling the polarization state of the signal for the right eye or the left eye.

9. The display device of claim 5 , wherein the second light-penetration-controlling region is positioned so as to come in contact with the polarization state-controlling region's side which is an opposite side to the polarization state-controlling region's side coming in contact with the second polarizing plate, and also positioned so as to be overlapped with at least a part of the region for controlling the polarization state of the signal for the right eye or the left eye.

10. The display device of claim 1 , wherein the second light-penetration-controlling region comprises a light-blocking ink or a light-absorbing ink.

11. The display device of claim 1 , wherein the second light-penetration-controlling region has a width in a range of more than 0 μm and also not more than 1,000 μm.

12. The display device of claim 1 , wherein the second light-penetration-controlling region has a width that is the same as or is less than that of the first light-penetration-controlling region.

13. The display device of claim 12 , wherein the difference between the widths of the first and second light-penetration-controlling regions is not more than 1,000 μm.

14. The display device of claim 1 , wherein the relative brightness observed from the front side is not less than 60%, the relative brightness being a ratio (I T /I O ) of the brightness (I T ) of the device in which the first and second light-penetration-controlling regions are formed with respect to the brightness (I O ) of the device in which both of the first and second light-penetration-controlling regions are not formed.

15. The display device of claim 1 , wherein the maximum value of the angle θ U satisfying the following Formula 2 and the maximum value of the angle θ L satisfying the following Formula 3 are not less than three degrees:

tan θ U =( H 1 +2 y )/2 T   [Formula 2]

tan θ L =( H 1 +2 H 2 −2 y )/2 T   [Formula 3].

wherein H 1 and H 2 are the widths of the first and second light-penetration-controlling regions, respectively, T represents the distance from the displaying part to the filtering part, and y represents the distance from the point, at which a hypothetical normal of a line bisecting the width of the first light-penetration-controlling region with respect to the surface of the first light-penetration-controlling region comes in contact with the second light-penetration-controlling region, to the point on which the second light-penetration-controlling region is presented.

16. The display device of claim 15 , wherein the distance from the displaying part to the filtering part is 5 mm or less.

17. The display device of claim 15 , wherein the relative brightness observed from the front side is not less than 60%, the relative brightness being a ratio (I T /I O ) of the brightness (I T ) of the device in which the first and second light-penetration-controlling regions are formed with respect to the brightness (I O ) of the device in which both of the first and second light-penetration-controlling regions are not formed.

18. A method for preparing a display device that comprises a displaying part comprising a region for generating a signal for a right eye, configured to generate the signal for the right eye, and a region for generating a signal for a left eye, configured to generate the signal for the left eye; and a filtering part comprising a polarization state-controlling region that comprises a region for controlling the polarization state of a signal for a right eye in a position into which the signal for the right eye can enter and a region for controlling the polarization state of a signal for a left eye in a position into which the signal for the left eye can enter;

wherein the method comprises positioning a first light-penetration-controlling region to be adjacent to the regions for generating the signals for the right eye and the left eye so as for a part of the signal for the right eye or the left eye generated from the region for generating the signal for the right eye or the left eye to enter into the first light-penetration-controlling region in at least one angle falling within the ranges of viewing angle, and positioning a second light-penetration-controlling region to be adjacent to the regions for controlling the polarization states of the signals for the right eye and the left eye so as for the signal for the right eye or the left eye to enter into the second light-penetration-controlling region in at least one angle falling within the ranges of viewing angle before the signal for the right eye or the left eye enters into the region for controlling the polarization state of the signal for the right eye or the left eye, in the process that the signal for the right eye or the left eye penetrates the region for controlling the polarization state of the signal for the right eye or the left eye or after the signal for the right eye or the left eye penetrates the region for controlling the polarization state of the signal for the right eye or the left eye, and

wherein the first and second light-penetration-controlling regions satisfy the following Formula 1:

H 1 +H 2 ≦( P L +P R )/2  [Formula 1]

wherein H 1 and H 2 are the widths of the first and second light-penetration-controlling regions, respectively, and P L and P R are the widths of the regions for controlling the polarization states of the signals for the left eye and the right eye, respectively.