Abstract
The present state of 3-D display technologies is viewed from the point of 3-D video. First, different two categories are tried, and the merit and the demerit of each practical display method are mentioned. Next, new methods which have been recently developed are introduced with the key points. In future, observation of 3-D image should be natural and observers should not be tired. From this point of view, it becomes important the comparison of eye control between the case of real object observation and 3-D display observation. The researches of these progress are mentioned.
