Image display device capable of three-dimensionally displaying an item or user interface and a method for operating the same

An image display device for displaying a 3-dimensional (3D) image, the image display device comprising:

• a display unit configured to display a high-level User Interface (UI) image including at least one low-level item;
• a user input unit configured to receive, from a remote controller, a user selection signal for selecting one of the at least one low-level item;
• a broadcast signal reception unit configured to receive a broadcast signal corresponding to the selected low-level item;
• and
• a control unit configured to generate a low-level UI image corresponding to the selected low-level item,
• wherein the control unit generates the high-level UI image and the low-level UI image as 3D images having different senses of depth, and the display unit displays the high-level UI image and the low-level UI image together,
• wherein the selected low-level item is highlighted for discriminating between the selected low-level item and any other low-level items,
• wherein a depth of the low-level UI image is greater than a depth of the high-level UI image,
• wherein the low-level image includes an exit item indicating a termination of the display of the low-level image,
• wherein the control unit includes:
• an on-screen display (OSD) generator configured to extract a thumbnail image corresponding to the broadcast signal and to generate and output an OSD signal including the extracted thumbnail image;
• and
• a formatter configured to convert the OSD signal into the 3D image, and
• wherein the displayed low-level UI image further includes the thumbnail image,
• wherein:
• the high-level UI image and the low-level UI image include multiview images each including a left-eye image and a right-eye image,
• the control unit changes disparity between the left-eye image and the right-eye image for the high-level UI image and disparity between the left-eye image and the right-eye image for the low-level UI image according to the senses of depth set to the high-level UI image and the low-level UI image, and
• the control unit sets the disparity between the left-eye image and the right-eye image for the low-level UI image to be greater than the disparity between the left-eye image and the right-eye image for the high-level UI image.