The projector screen gain

 1. What is the projector screen gain

Gain : It is a number in the reflection characteristics ( brightness of different angles ) projector screen material inherent.
To completely diffuse scattering surface ( ie 180 degrees vertical and horizontal directions are the same reflectance reflective surface ) cast some light on , when the reflection brightness is set to be 1 . Then under the same conditions , in the direction perpendicular to the projector screen projected the same light, the brightness is measured on the same arc center and each point , the brightness and complete diffuse scattering intensity ratio is called the projector screen gain.

2.half the gain of projector screen

It is an important measure of projector screen brightness . Projection Screen center position is in the vertical direction of the projector screen when watching most highlights of the projector screen, the viewer off the projector screen when viewing axis direction , the projector screen brightness is reduced to half the maximum brightness gain is the gain of half time . In addition , the projector screen gain is reduced to half when the viewing angle is called the half- gain angles , half-gain angle is a measure of an important indicator of the projector screen technology. Half gain angle increases , we can watch to the more clear the projector screen contents of the above .

3.the impact of the projector screen gain on the image

No gain projector screen image presented more peaceful faithful , but vulnerable environment and external light. And then there is the gain of the projector screen brings a bright , rich layers , colorful screen , and environment and external light its impact is small. But the viewing angle of the projector screen and the projector screen has a special gain inverse relationship , ie the higher the gain , the smaller the viewing angle . Gain too high ( half-gain angle is too small ) projector screen will cause the intermediate light , dark corners of effects and high brightness portion appears saturated with no sense of hierarchy since the energy is too concentrated, so only one or two lateral seats can watch Ming bright picture . Therefore , depending on the application should be chosen projector screen, the projector screen does not gain the higher the better .