| 主权项 |
1. An optical filter which is used to control a signal for a right eye and a signal for a left eye to have different polarized states from each other,
wherein the signals for the right eye and for the left eye are emitted from a stereoscopic image display device comprising a display part comprising signal generating regions for a right eye and a left eye configured to generate the signals for the right eye and left eye; and a first light transmission control region adjacent to the signal generating regions for the right eye and the left eye, and which comprises a liquid crystal layer having first and second regions adjacent to each other which are capable of dividing incident light into at least two kinds of lights having different polarized states and emitting the divided lights; and a second light transmission control region in the boundary between the first and second regions, wherein the second light transmission control region is formed so that the maximum value of an angle “θU” satisfying Expression 2 and the maximum value of an angle “θL” satisfying Expression 3 are three degrees or more, wherein the stereoscopic image display device to which the optical filter is applied has a relative brightness of 60% or more when observed from front, wherein the relative brightness refer to a ratio of brightness IT of the stereoscopic image display device having the first light transmission control region and the second light transmission control region formed with respect to brightness IO of a stereoscopic image display device having neither the first light transmission control region nor the second light transmission control region:
tan θU=(H1+2y)/2T [Expression 2]tan θL=(H1+2H2−2y)/2T [Expression 3] where H1 is the width of the first light transmission control region of the stereoscopic image display device, H2 is the width of the second light transmission control region of the optical filter, T is the distance from the display part to the optical filter in the device to which the optical filter is applied, and y is the distance from a point at which an imaginary normal line bisecting the first light transmission control region meets the second light transmission control region, to an end point of the second light transmission control region, in a lateral view of the stereoscopic image display device, wherein the optical filter further comprises a base layer, the liquid crystal layer is formed on the base layer, at least a part of the liquid crystal layer is contacted with the base layer, and the second light transmission control region is between the base layer and the liquid crystal layer, or on the liquid crystal layer's surface, opposite to the surface on which the base layer is formed, and wherein H2 is in a range of more than 0 to 1000 μm and H2 is same as or smaller than H1. |
