Private display apparatus

PURPOSE: A security display device is provided to enable a user to watch a security image with general stereoscopic glasses without changing an essential component of the display device or using dedicated glasses equipped with a separate decoding function. CONSTITUTION: An image processing part (120) of a display (100) generates a reversed image by reversing an inputted normal image, outputs the normal image as one image among a left-eye and a right-eye image, and outputs the reversed image as the other image among the left-eye and right-eye images. A display part (130) of the display displays the outputted left-eye and right-eye images. Stereoscopic glasses (200) filter out the reversed image in order to enable a user to watch the normal image among the images displayed on the display part. [Reference numerals] (110) Image signal receiving part; (120) Image processing part; (130) Display part; (140) Optical transmitting and receiving part; (220) Shutter driving part; (221 (225)) Left eye shutter, right eye shutter; (229) Mode setting part; (230) Optical receiving part; (250,350) Control part; (260,360) Battery part; (320) Signal transmitting and receiving part