INFORMATION DISPLAY DEVICE
The problem the present invention addresses is the provision of an information display device that is capable of showing a main image to specific viewers only and showing another image to other viewers. In order to do so, a brightness change unit (121) changes the brightness of a main image and another brightness change unit (122) generates a correction image in accordance with the difference between the main image and a secondary image. A projector (221) projects the main image onto a screen (24) through a polarizing filter (231), and another projector (222) projects the correction image onto the screen (24) through another polarizing filter (232). Specific viewers view the screen (24) using glasses (30) that have polarizing filters (31) exhibiting the same polarization direction as the abovementioned polarizing filter (231), and other viewers view the screen (24) without glasses.