Projection screen and projection system

A projection screen, comprising:

• a surface layer;
• at least one substrate layer;
• a Fresnel lens layer;
• a reflective layer;
• the surface layer, the at least one substrate layer, the Fresnel lens layer, and the reflective layer being sequentially arranged in a stack manner;
• and
• a plurality of light-transmitting protrusions, the plurality of light-transmitting protrusions being disposed on a surface of the surface layer away from the Fresnel lens layer;
• wherein at least one light-transmitting protrusion of the plurality of light-transmitting protrusions includes:
• a body portion;
• and
• at least one of a gradually narrowing portion or a gradually expanding portion, the gradually narrowing portion or the gradually expanding portion being disposed on a surface of the body portion away from the Fresnel lens layer;
• wherein the at least one substrate layer includes a plurality of substrate layers;
• the surface layer, the plurality of substrate layers, the Fresnel lens layer, and the reflective layer are sequentially stacked;
• the plurality of substrate layers are sequentially stacked;
• and
• in a rolling direction of the projection screen, a thickness of an inner substrate layer is smaller than a thickness of an outer substrate layer.