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how far behind screen should rear projector

by:XY Screens     2023-10-19

How Far Behind Screen Should Rear Projector Be Placed?


Rear projectors have gained a lot of popularity in recent years due to their immersive display capabilities. However, one crucial aspect that often gets overlooked is the placement of the projector. In this article, we will discuss the ideal distance for placing a rear projector behind the screen and explore the factors that influence this positioning.

Understanding Rear Projection:

Before delving into the recommended distance, it is essential to understand the concept of rear projection. Unlike traditional projectors that are placed in front of a screen, rear projectors are positioned behind a semi-translucent screen. The projector beams the image onto the screen, which then reflects the content back to the viewers. This setup allows for a more controlled and aesthetically pleasing viewing experience.

Five Factors Affecting Rear Projection Placement:

1. Screen Type and Gain:

The type of screen you choose for your rear projection setup plays a crucial role in determining the ideal distance between the projector and the screen. Screens with higher gain, which refers to the reflective capacity of the screen surface, are designed to reflect more light. These screens typically require the projector to be placed further away to avoid hotspotting or hot spots in the display. Conversely, screens with lower gain may permit the projector to be positioned closer to the screen.

2. Projector Brightness:

Projector brightness is another essential factor to consider when positioning a rear projector. The brightness output of the projector affects the image quality and the distance required between the projector and the screen. Higher brightness projectors can be positioned further behind the screen without sacrificing image clarity. However, if you have a less powerful projector, it is advisable to place it closer to the screen to maintain optimum image brightness and detail.

3. Viewing Angle:

The viewing angle is a crucial aspect to consider for a rear projection setup. Ideally, the projector should be positioned in a way that allows for maximum viewing angle coverage. Placing the projector too far behind the screen can limit the viewing angle and result in diminished image quality for viewers seated at wider angles. Strike a balance between projector positioning and viewing angle to ensure an immersive experience for everyone in the room.

4. Ambient Light Conditions:

Ambient light conditions within the room can significantly impact the placement of a rear projector. If the room has excessive ambient light, placing the projector closer to the screen can help combat the light interference and maintain image quality. Conversely, in a dark room, you may have more flexibility in placing the projector further behind the screen. Consider the light conditions of your viewing space and adjust the projector's position accordingly to optimize image display.

5. Screen Size and Throw Ratio:

Another determining factor for rear projector placement is the screen size and the projector's throw ratio. The throw ratio is the calculation of the distance from the projector to the screen compared to the screen width. Different projectors have different throw ratios, meaning that the required distance behind the screen will vary depending on the specific projector model. Always consult the manufacturer's specifications or user manual to determine the appropriate throw ratio and screen size for your setup.


The ideal distance for placing a rear projector behind the screen depends on various factors, including screen type and gain, projector brightness, viewing angle, ambient light conditions, screen size, and throw ratio. By considering these factors, you can ensure optimal image quality and a satisfying viewing experience. Remember to consult the manufacturer's guidelines and experiment with different positions to find the perfect balance between screen distance and visual excellence for your rear projection setup.

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