| 摘要 |
An image display apparatus (100), which has a high contrast and can suppress the contrast variation and the effect of unwanted reflections regardless of the environment, comprises a luminescent layer (104); an excitation source (103) which excites the luminescent layer; a front layer (101) which obtains display light by transmitting light generated by the luminescent layer excited by the excitation source; and a periodic structure (105) which is provided between the front layer and the luminescent layer and has a periodic refractive index distribution in a surface parallel to the front layer, wherein the periodic structure satisfies a relation of a following expression and the periodic interval of the periodic structure is 1 µm or greater and 3 µm or less. 1 < N sub ‰¤ N eff Where N eff denotes an effective refractive index of the periodic structure and N sub denotes a refractive index of a medium constituting the front layer. |
