Spectacles for three-dimensional viewing of digital video content from a projector

Spectacles for three-dimensional viewing of digital video content from a projector, said spectacles comprising:

• a single cell comprising first and second substrates disposed facing each other in order to form a free space;
• a liquid crystal placed in said free space and having a half-wave blade configuration;
• a first rectilinear polariser of polarisation axis P1 adapted to polarise light coming from said projector and disposed on a first external surface of the first substrate of the cell;
• and
• a second rectilinear polariser of polarisation axis P2 is disposed on a second external surface of the second substrate, said polarisation axes P1 and P2 of the first and second polarisers being parallel or perpendicular to each other,
• wherein the liquid crystal comprises first and second distinct zones each situated opposite a vision axis, right and left respectively, the first zone comprising a first director and the second zone comprising a second director, said first and second directors:
• being symmetrical and each forming an angle β with respect to a first direction B1 defined as the bisector of the two polarisation axes P1 and P2 of the first and second polarisers respectively, if said two polarisation axes P1 and P2 of the first and second polarisers are perpendicular to each other,
• or being symmetrical and each forming an angle β with respect to a second direction B2 forming an angle of 45° with respect to a common polarisation axis P of the first and second polarisers, if said two polarisation axes P1 and P2 of the first and second polarisers are parallel to each other,
• or being symmetrical and each forming an angle π/2−β with respect to a third direction B3 perpendicular to the bisector of the two polarisation axes P1 and P2 of the first and second polarisers respectively, if said two polarisation axes P1 and P2 of the first and second polarisers are perpendicular to each other,
• or being symmetrical and each forming an angle π/2−β with respect to a fourth direction B4 forming an angle of −45° with respect to a common polarisation axis P of the first and second polarisers if said two polarisation axes P1 and P2 of the first and second polarisers are parallel to each other.