A diffuser is disclosed which transmits or reflects incident light into a specific
range of angles. In a preferred embodiment, this light is uniformly scattered throughout
a cone of angles. The diffuser consists of two parts. The first part diffracts
or reflects light into a specific offset angle. The second part, in the preferred
embodiment, uniformly scatters the light through a range of angles, which is centered
on the offset angle. The diffusers have utility in applications such as screens
for wrist watches, computers, calculators, and cell phones.