01/20/2022
Rear Projection Tab tensioned projection screens
1.More contract than front projection
2.Better ambient light rejection from viewer
3.Tensioned style makes the screen more flat
4.More bright than front projection
Rear projection screens are classified into optical rear projection screens, diffused screens and soft rear projection screens. These rear projection screens with different imaging principles have overcome many of the shortcomings of front projection methods: the projector is installed in the darkroom behind the screen. , It will not cause imbalance to the decoration, and it also shields the noise generated by the operation of the projector, and is not easily disturbed by ambient light.
It is worth mentioning that the optical rear projection screen, the matt anti-glare surface can effectively absorb the background light, effectively resist the light microphone from the window and artificial lighting equipment, so that the projection effect is not affected by the ambient light has become a reality.
Rear projection soft screen has the advantages of cheap, seamless (size can be customized), convenient transportation and installation (can be folded), no requirement for the focal length of the projector lens, etc. It is usually used in the rental industry.
The installation of rear projection is more complicated, and the front projection is relatively simple
The installation of rear projection is more complicated, because not any projection environment has enough projection distance to achieve the ideal projection effect. The installation process of the rear projection system is more complicated, which includes the design of the wall for installing the screen, and the house structure suitable for handling the rear projection screen; such as the width of the door, the elevator, etc. The installation project also requires professionals to operate, which is a bit more complicated.
The front projection has fewer restrictions on the projection distance. Just like the concept of front projection, it is said that the installation position of the projector used in the front projection system is on the same side of the audience as the screen, so the installation space of the projector of the front projection system is already within the area of the audio-visual space, and there is no need to increase the placement space. The installation and placement of the projector in the front projection system is also relatively simple, just place one projector in front of a screen. Most people know how to design such a system. Design is easy and intuitive.
For rear projection screens, the space where the projector is installed must be completely black. Ensuring that the projector space is completely black is more important than controlling the ambient light. For front projection, the ambient light must be controlled, but it is not completely black. A bright screen does not need to strictly control the ambient light.
The projection distance of rear projection can be smaller than that of front projection. If the projector projects an image directly to the screen, the space required for both front and rear projection is the same. If a reflective system is used in the rear projection system, the space required can be smaller. The most typical example is the thickness of the rear projection TV is only 50 to 60 inches.
The rear projection screen is transparent, the front projection screen is opaque
The front projection screen is white or gray, and is opaque because it reflects light back into the viewer's eye. The rear projection screen is transparent, and there are two options for the rear projection screen, one is a slow reflection screen, the other is an optical screen, and their display effects are different. Optical screens absorb light from the projector and send it evenly to the audience. The light is evenly distributed in the center and corners of the screen. The slow reflection screen is an ordinary transparent plastic sheet or glass layer, but some diffuse reflection materials are added to it. The image displayed by the slow reflection screen is not uniformly sent to the viewer's eyes, but diverges irregularly in all directions, the sun effect is very strong, and the corners are relatively dark.
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