Combining the elements
By combining the Fresnel lens element with lenticular or other elements, optical rear projection screens with various characteristics can be manufactured. This is why they are called ‘optical screens.’
Typical combinations are:
- Fresnel lens with diffusion. This results in a low gain, wide dispersion screen. Contrast is controlled using tint.
- Fresnel with lenticular. This results in a high gain with differentiated horizontal and vertical light dispersion. Contrast is controlled by using tint.
- Fresnel lens with lenticular and with high contrast layer. This results in a medium gain, high contrast screen with differentiated horizontal and vertical light dispersion.
- Fresnel lens with glass bead. This results in a moderate gain, very high contrast screen with wide and even light dispersion.
In general, optical screens offer significantly better image quality than diffusion screens.
< High contrast glass bead Fresnel screen focal length >