Digital (or electronic) holography and its application to 3-D display is one of the formidable problems of evolving areas of high technology that has been receiving great attention in recent years. Indeed, the "Holy Grail" for 3-D display is the realization of life-size interactive 3-D displays. Obviously, we are not there yet, but advances in 3-D display allow us to make important steps towards the Holy Grail. The theme of this book is to organize a collection of key chapters that covers digital holography and 3-D display techniques so as to provide the reader with the state-of-the-art developments in these important areas around the world.