| 摘要 |
A video display device is provided with a light source, a display element, and an eyepiece optical system (14). The light source has at least one emission peak wavelength and emits light with a wavelength width including one emission peak wavelength. The display element modulates the light emitted from the light source and displays video. The eyepiece optical system (14) comprises a volume phase reflective HOE (23) which diffracts and reflects video light from the display element and leads the light to a viewing pupil. An HOE surface (23a) is divided into a plurality of flat surfaces (for example, a first flat surface (31), a second flat surface (32), and a third flat surface (33)) disposed so as to be recessed on the viewing pupil side, and the plurality of flat surfaces are continuous so as to have a common ridge line at a boundary between the flat surfaces adjacent to each other. |
