Fresnel projection screen and projection system

A Fresnel projection screen, comprising a transparent layer, a color layer, a diffusion layer and a Fresnel layer arranged in sequence along a light incident direction;

• wherein the transparent layer includes:
• a transparent base;
• and
• a micro-structure layer disposed on a light incident surface of the transparent base and configured to diffusely reflect a portion of light incident thereon and refract another portion of the light;
• wherein
• the micro-structure layer includes a plurality of first micro-structures and a plurality of second micro-structures disposed on a surface of the plurality of first micro-structures;
• a dimension of each first micro-structure is greater than a dimension of each second micro-structure, and the dimension includes at least one of a width, length or thickness of a micro-structure;
• the plurality of first micro-structures and the plurality of second micro-structures are projections;
• and
• a curvature radius of each first micro-structure is within a range from 50 μm to 500 μm and a curvature radius of each second micro-structure is within a range from 10 μm to 100 μm.

A Fresnel projection screen, comprising:

• a Fresnel layer;
• a first micro-structure layer disposed at a light incident side of the Fresnel layer, the first micro-structure layer including a plurality of first micro-structures that are configured to diffusely reflect a portion of light incident thereon and refract another portion of the light;
• a second micro-structure layer disposed on a surface of the first micro-structure layer, the second micro-structure layer including a plurality of second micro-structures that are configured to diffusely reflect a portion of light incident thereon and refract another portion of the light;
• and
• a reflective layer disposed on a side of the Fresnel layer away from the first micro-structure layer;
• wherein the second micro-structure layer is disposed between the first micro-structure layer and the Fresnel layer.