A light reflection and diffraction element for enhancing the contrast of an image
display device. In an off state of the element, a portion exhibiting a cyclic structure
for diffracting incident light in a region where reflective members having reflection
surfaces are aligned is reduced by preventing the generation of unrequired diffracted
light. For example, by covering connection regions of the ribbon reflective members
by light shielding masks, incident light is shielded. Preferably, any uneven state
of the reflection surfaces of the ribbon reflective members is controlled, and
a correlation length is made small.