CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to JP Patent Application No. 2016-187615, filed Sep. 26, 2016, the entire content of which is incorporated herein in its entirety by reference.

TECHNICAL FIELD

The present invention relates to a display element, and in particular relates to an image display device element, a reflective element, and a filter element.

BACKGROUND

In the technical field of image display devices, image display devices that display images using structural colors have been already known. Image display devices of this type include, for example, an image display device described in JP Patent Publication No. 2006-099070 A. Electromagnetic waves are classified into various classifications according to wavelengths and are referred to as radio waves, light, X rays, and gamma rays in descending order of wavelength.

BRIEF SUMMARY

JP Patent Publication No. 2006-099070 A describes an image display device in which a plurality of image display device elements, by which structural colors are developed, are arranged in a planar manner.

When, in an image display device in which a plurality of image display device elements are arranged in a planar manner, elements each of which can emit only light having any one of red, green, and blue colors are used, the amount of the light emission is reduced to one third in principle. For this reason, there is a problem in the above-described image display device in that the display screen cannot be brightened sufficiently.

The present invention is made in consideration of the above-described problem, and an object of the present invention is to provide a display element, particularly an image display device element, a reflective element, and a filter element, by which a display screen can be brightened by displaying red, green, blue, and composite colors thereof using a single light-emitting portion. Note that a reflective element and a filter element are the same elements except being different only in names depending on use purposes. The same applies to a notch filter and a band-pass filter.

