Patent ID: 7956941

Claim:
A method for reducing speckle in an image produced from a coherent light source, the method comprising: providing a display screen comprising a first substrate, a second substrate, and a liquid crystal layer disposed between the first and second substrates, the liquid crystal layer comprising a plurality of molecules; directing a beam of coherent light at the display screen; applying an electrical signal to the liquid crystal layer to produce an electrical field traversing across the liquid crystal layer from the first substrate to the second substrate, the electrical signal repeatedly transitioning the plurality of molecules between a first state and a second state, the plurality of molecules having a different random orientation in each first state, the plurality of molecules substantially aligned with the electrical field in the second state; and wherein the varied application of the electrical signal results in the plurality of molecules being in the first state a majority of an operational period such that a sequence of randomly oriented first states reduces spatial coherence in an image projected through the liquid crystal layer.