High elastic modulus projection screen substrates
View Patent ↗A stiffening strip at selected edges of a screen may enable the use and mounting of a high-elastic modulus substrate screen material. Such screen materials may be engineered to provide polarization-preserving characteristics, and be applied to or part of the high-elastic modulus substrate. Furthermore, the stiffening strip may enable the use of screen vibration techniques to reduce speckle in display applications that use projection screens, particularly those display applications using illumination sources prone to speckle such as laser-based projection. The screen vibration may be provided by a vibrating device attached to the stiffening strip.
1. A projection screen, comprising:
a high-elastic modulus substrate, wherein the high-elastic modulus substrate comprises a first subsection and a second subsection of the high-elastic modulus substrate joined together;
at least one vibration device proximate to the high-elastic modulus substrate, wherein the at least one vibration device is operable to vibrate the high-elastic modulus substrate while maintaining less than approximately ten percent intensity variation across the screen; and
wherein the projection screen is a gain screen.
2. The projection screen of claim 1 , wherein the at least one vibration device is a transducer.
3. The projection screen of claim 2 , further comprising a mounting strip proximate to at least two edges of the projection screen.
4. The projection screen of claim 3 , wherein the mounting strip further comprises a high-elastic modulus material.
5. The projection screen of claim 4 , wherein the mounting strip and the high elastic-modulus substrate of the screen are the same material.
6. The projection screen of claim 1 , wherein the at least one vibration device is mounted to the mounting strip in at least one location.
7. The projection screen of claim 1 , wherein the vibration generated by the at least one vibration device is sufficient to reduce the speckle contrast to less than approximately 15 percent speckle contrast.