| 摘要 |
PROBLEM TO BE SOLVED: To easily make an image display device lightweight and thin and to attain high picture quality by arranging ultraviolet luminescent elements and phosphors absorbing ultraviolet light and emitting visible light in sequence on a transparent substrate, and utilizing the ultraviolet luminescent elements as an excitation energy source for the phosphors. SOLUTION: Multiple first electrodes 3 arranged nearly in parallel to each other, an ultraviolet luminescent film 4, multiple second electrodes 5 arranged nearly in parallel to each other and nearly perpendicularly to the first electrodes 3, and phosphors 6 are laminated in this order on a transparent substrate 2. The first electrode 3 and the ultraviolet luminescent film 4 form an ultraviolet luminous EL element 7. The controller of this image display device controls the electric field applied between the first electrodes 3 and the second electrodes 5. When the electric field is applied between the first electrodes 3 and the second electrodes 5, the ultraviolet luminous EL elements 7 emit ultraviolet light with the wavelength 400 nm or below. The phosphors 6 wavelength-convert the ultraviolet light into visible light and emit it in the incidence direction of the ultraviolet light. |
