![]() ![]() For such ‘silver screens,’ manufacturers frequently publish an “extinction rate” or “extinction ratio” which is a measure of the ability of a given screen material to retain the polarization of the projected light. This generally means that you must use a ‘Silver Screen’ material made specifically for use with such passive 3D projection systems. Screens for use with Passive Polarized 3D Projection Systemsįor screens intended for use with passive polarized 3D projection systems (i.e., that rely on polarization to separate the right from the left images), the screen must retain close to 100% of the polarization otherwise visible 3D cross-talk or ghosting will occur. Only projection screens that retain very near to 100% of the polarization are suitable for use with such passive 3D projection systems. This is the technique is used by RealD for 3D presentations in commercial digital cinemas. left images (i.e., right hand circular vs. The other polarization approach is to use circular polarization with an opposite direction for the polarization orientation used the right vs. This technique is frequently seen for 3D presentations in digital IMAX theaters. left images is offset by 90 degrees (e.g., vertical vs. The light may either be linear polarized, where the polarization orientation for the right vs. This is because such 3D projection systems use polarized light, with different orientations, to separate the left and right images and the viewer must wear polarized 3D eyeglasses (sometime called passive 3D glasses since they contain no electronics). With passive 3D projection systems that rely on polarized light (as being discussed in this current series of blogs), retaining the polarization of the projected light is absolutely essential. Retention of Polarized Light – This characteristic of projection screens is only important for 3D projection and even then it only applies for screens used with 3D projection systems that project polarized light. ![]() Below is an update from some of the material presented in earlier blogs. Projection Screens for Passive Polarized 3Dīack in August 2011, I posted a two part series of blogs on “Screens for 3D Projection.” Later I posted some information on new “silver screen” materials from Da-Lite and Stewart. For this blog I will recap some of the information presented in my earlier blogs (from last year) on projection screens intended for use with passive polarized 3D projection systems and also discuss the potential role for video processing. The six previous blogs in this series have covered all of the functional elements shown in the above functional diagram, except for the projection screen.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |