PROJECTION SCREEN (OPTIONS) Russian patent published in 2008 - IPC G03B21/56 

FIELD: physics.

SUBSTANCE: projection screen contains successively placed layers as follows: transparent layer composed of microlens array, light-reflecting layer, basis, i.e. light-absorbing layer, which is sandwiched between said transparent layer and light-reflecting layer, and array of transparent windows in said light-absorbing layer that are positioned opposite to microlenses and filled with diffusion medium. Radius of microlenses, R_L, meets the following condition: r₀ ^s〉R_L〉r₀ ^а, where r₀ ^а is the coherence radius of ambient light, and r₀ ^s is the coherence radius of projected light. Microlenses are made capable to focus more coherent projected light to said windows in the form of spots with sizes equal to that of windows, and less coherent ambient light is focused to said light-absorbing layer and windows in the form of spots with sizes much bigger than that of windows. The light-absorbing layer is made capable to absorb major portion of the ambient light, while transparent windows are made capable to pass the projected light and minor portion of the ambient light to the reflecting coating, which is made capable to reflect the projected light back to windows.

EFFECT: new type of projection screen.

11 cl, 5 dwg