[Relationship between projection screen gain and viewing angle, distance and brightness] Projection screen technology introduction

The relationship between projection screen gain and viewing angle, distance and brightness
1. The relationship between gain and viewing angle
Generally speaking, the gain of the projection screen and the viewing angle are a pair of contradictions. Under certain conditions, the higher the gain, the smaller the viewing angle. Conversely, the larger the viewing angle, the lower the gain. Therefore, increasing the viewing angle when the gain is constant or increasing the gain when the viewing angle is the same is a problem that the projection screen Ru0026D experts continue to research, experiment, and need to solve.
2. The relationship between distance and brightness (illuminance × area u003d brightness)
The closer it is to the light source, the brighter it is, and the farther it is, the darker it is. This is a basic common sense that everyone knows. In the same way, in the field of projection display, the same projector and the same screen have different brightness from different screens on the same screen. In other words, the same projector and screen must be filled with screens of different sizes, and the brightness of the screen will be different because of the distance.

But the same projector and picture on screens with different gains are completely different. Experts test: use the same brand, the same model, the same factory time of the projector and the same test screen to hit a normal screen with a gain of 2 and a Metron metal soft screen with a gain of 4. The brightness of the two screens is different due to different gains. Completely different, the screen brightness with high gain is also high.
Experts continue to test: move the projector that hits the metal screen backwards to keep it away from the screen. When the brightness of the two screens is the same, they find that the distance between the two projectors is almost doubled, and the projection screen is on the screen. The area on the screen is four times different. In other words: the brightness of the same projector and picture on a 72-inch screen with a gain of 2 is almost equal to the brightness of a 150-inch metal soft screen with a gain of 4.
But the 150-inch screen can hold the audience and its large screen is by no means comparable to the 72-inch screen. At the same time, the larger the screen size, the greater the number of viewers who can watch the undistorted picture.
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Three, conclusion
1) In view of the current mainstream projectors whose brightness is above 2000 lumens, when selecting the screen, the small size should consider the large viewing angle, and the large size should consider the high gain.
2) When the illuminance (lumens) of the projector and the brightness of the screen (the desired picture effect) have been determined, a high-gain large-size screen should be selected as much as possible, so that it is more economical and more in line with the pursuit of the projector . And blindly pursuing a large angle of view is meaningless except to appreciate distorted images.