Source: {"pile_set_name": "USPTO Backgrounds"}

1. Technical Field
The present invention relates to a screen on which an image is projected.
2. Related Art
There has been known a screen having a plurality of lens elements formed on a light-incident surface on which light is incident, each of which reflects the incident light (see JP-A-2006-215162, for example).
The screen described in JP-A-2006-215162 is so configured that a plurality of unit shape portions having the same shape are regularly disposed two-dimensionally on a surface of a substrate sheet and each of the unit shape portions is formed of a semispherical or convex-lens-shaped protruding portion. A reflection surface is formed on the surface of each of the unit shape portions in a section where light is incident from a projector disposed in advance in an intended position. Projection light obliquely projected from a position in front of the screen is diffused and reflected off the reflection surface of each of the unit shape portions, whereby viewers in a wide viewing range can view a projected image.
However, since the unit shape portions on the screen described in JP-A-2006-215162 are regularly arranged two-dimensionally, light fluxes that exit from adjacent unit shape portions travel along substantially the same optical paths and reach a predetermined viewing position, likely causing a moire pattern (interference fringes) and scintillation in a projected image. Such a moire pattern and scintillation tend to degrade the displayed image.