A display device (110, 210, 310, 410, 510), comprising: a display panel (120, 220, 320, 420, 520) for displaying a plurality of images at a plurality of viewing zones (VZ1, VZ2, VZ3) in time division; a light source part (132, 232, 332, 432, 532) including a plurality of line light sources (174, 274) each emitting a ray toward a lens array (136, 236, 336, 436, 536); the lens array (136, 236, 336, 436, 536) including a plurality of lenses, the lens array (136, 236, 336, 436, 536) being configured to collimate the rays; a position sensing unit (160, 260, 360, 460, 560) for obtaining a position information about the plurality of viewing zones (VZ1, VZ2, VZ3), the position information relating to information about a target position which a user or one of left and right eyes of a user is disposed in and an image of the display panel (12, 220, 320, 420, 520) is directed to; a ray adjusting part; and a control unit (162, 262, 362, 462, 562) for controlling the display panel (120, 220, 320, 420, 520), the light source part (132, 232, 332, 432, 532), the ray adjusting part and the position sensing unit (160, 260, 360, 460, 560) according to the position information, wherein the control unit (162, 262, 362, 462, 562) is configured for controlling the ray adjusting part for adjusting the direction of the ray based on the position information, characterized in that the lens array (136, 236, 336, 436, 536), the ray adjusting part, and the light source part (132, 232, 332, 432, 532) are included in an edge-type backlight unit and are disposed along a side of a light guide plate (138, 238, 338), the ray adjusting part being disposed between the light source part (132, 232, 332, 432, 532) and the lens array (136, 236, 336, 436, 536), the light guide plate (138, 238, 338) being disposed under the display panel (120, 220, 320, 420, 520) and configured to change a direction of the ray from the lens array (136, 236, 336, 436, 536) toward the display panel (120, 220, 320, 420, 520). a display panel (120, 220, 320, 420, 520) for displaying a plurality of images at a plurality of viewing zones (VZ1, VZ2, VZ3) in time division; a light source part (132, 232, 332, 432, 532) including a plurality of line light sources (174, 274) each emitting a ray toward a lens array (136, 236, 336, 436, 536); the lens array (136, 236, 336, 436, 536) including a plurality of lenses, the lens array (136, 236, 336, 436, 536) being configured to collimate the rays; a position sensing unit (160, 260, 360, 460, 560) for obtaining a position information about the plurality of viewing zones (VZ1, VZ2, VZ3), the position information relating to information about a target position which a user or one of left and right eyes of a user is disposed in and an image of the display panel (12, 220, 320, 420, 520) is directed to; a ray adjusting part; and a control unit (162, 262, 362, 462, 562) for controlling the display panel (120, 220, 320, 420, 520), the light source part (132, 232, 332, 432, 532), the ray adjusting part and the position sensing unit (160, 260, 360, 460, 560) according to the position information, wherein the control unit (162, 262, 362, 462, 562) is configured for controlling the ray adjusting part for adjusting the direction of the ray based on the position information, characterized in that the lens array (136, 236, 336, 436, 536), the ray adjusting part, and the light source part (132, 232, 332, 432, 532) are included in an edge-type backlight unit and are disposed along a side of a light guide plate (138, 238, 338), the ray adjusting part being disposed between the light source part (132, 232, 332, 432, 532) and the lens array (136, 236, 336, 436, 536), the light guide plate (138, 238, 338) being disposed under the display panel (120, 220, 320, 420, 520) and configured to change a direction of the ray from the lens array (136, 236, 336, 436, 536) toward the display panel (120, 220, 320, 420, 520).