Patent ID: 7764253

Claim:
A display device, comprising: an image display device arranged to display an image; and a display switching device arranged to electrically switch between (i) an image to be seen in a single image display mode and (ii) an image to be seen in a multiple image display mode, wherein in the single image display mode, the display switching device allows an image displayed by the image display device to be seen from any direction, in the multiple image display mode, the display switching device (a) allows an image displayed by the image display device to be seen from a direction directly in front or approximately directly in front of the display device and (b) allows an image obtained by superimposing, on an image displayed by the image display device, a switching image formed by the display switching device to be seen from an oblique direction, the switching image including a transmission region and a non-transmission region, the transmission region having a proportion smaller than 50% of an entire display screen, and the switching image has the same appearance no matter which oblique direction the switching image is viewed from.