1. Field
Methods and apparatuses consistent with exemplary embodiments relate to a 3-dimensional (3D) display device and a method thereof, and more particularly, to a 3D display device which uses a barrier to enable a user to view a 3D image without 3D glasses, and a method thereof.
2. Description of the Related Art
With the development of electronic technologies, various kinds of electronic apparatuses have been developed and distributed. Display apparatuses such as televisions (TVs) are representative of home appliances.
In recent years, 3D display devices, which enable a user to view a 3D image, are increasingly being distributed. The 3D display devices may be divided into a glasses type system and a non-glasses type system according to whether the 3D display device uses 3D glasses.
One example of the glasses type system is a display device which employs a shutter glasses method. In the shutter glasses method, the display device outputs a left-eye image and a right-eye image alternately, and a left shutter glass and a right shutter glass of a 3D glasses apparatus worn by a user are opened and closed alternately in association with the output of the display device, thereby making the user feel a sense of depth.
The non-glasses type system may be referred to as an autostereoscopy system. A 3D display device of the non-glasses type method displays a space-shifted multi-view image, and projects light corresponding to images of different points of view onto a left eye and a right eye of a user using a parallax barrier or a lenticular lens, thereby making the user feel a sense of depth.
As described above, the non-glasses type system has the advantage of enabling users to view a 3D image without glasses.
FIG. 1 is a view to explain an operation of a related-art display device which uses a parallax barrier.
Referring to FIG. 1, a barrier 10 is disposed on an upper portion of a display panel 20. The barrier 10 includes a plurality of vertical line patterns. An odd line (a) and an even line (b) are turned on or off by being driven alternately.
The display panel 20 displays a frame in which a left-eye image (L) and a right-eye image (R) are placed alternately in a vertical column direction, and then displays a frame in which a left-eye image (L) and a right-eye image (R) are placed in reverse order of the previous frame.
The barrier 10 switches driving of the odd line and the even line according to the operation of the display panel 20. Accordingly, the left-eye image is continuously input to the left eye and the right-eye image is continuously input to the right eye, such that the user can feel a sense of depth.
However, since such a non-glasses type system provides a multi-view image, crosstalk in which a left-eye image and a right-eye image are mixed may occur.
In particular, when the user changes his or her location, the right-eye image may be projected onto the user's left eye and the left-eye image may be projected onto the user's right eye according to the movement of the user, and thus, a reverse image in which the left-eye image and the right-eye image are reversed may be generated.
Therefore, there is a demand for a method for displaying a 3D image effectively in a non-glasses type system.