One minute culture : frontal projection vs. rear projection

The role of a projector is to project an image on a screen, this projection can be done in two different ways, in front projection, by reflecting the light or in rear projection, by diffusing the light through the screen. But what differentiates these two projection methods?

Front projection characteristics

Frontal projection is a classic but still effective technique. It provides an immersive visual experience by reflecting the projector's light directly onto the projection surface.

• The light from the projector is reflected on the projection surface
• Projection will be optimal in a dark interior because any external light source harms and affects the projection quality
• There is no need for space behind the screen
• It is not necessary to have a large space

Rear projection characteristics

Rear projection is an ingenious alternative that creates a light path behind the screen and offers unique benefits in terms of contrast, color saturation and stability.

• Projector light passes through the projection surface
• The light path is created from the back of the screen without the possibility of masking the diffusion
• Contrast and color saturation are stable
• The projection quality is very little influenced by ambient light
• A certain image and resolution fidelity is guaranteed
• The projector and equipment takes up space behind the projection screen
• The larger the screen, the more space behind it.

The influence of the environment

To ensure projection quality, the choice of projection type is essential and depends greatly on the viewing environment as well as the available space. For example, image quality does not only depend on ambient light, it also varies depending on the light output of the projector and the gain of the projection surface. In addition, contrasts can sometimes be improved if we can control the lighting in the light path.

What type of projection best suits your needs?

To make the right decision, it is necessary to take into account different elements such as the size of the desired image, the viewing conditions, the availability of space in the room, whether behind or in front of the screen , as well as ambient light. All of these factors impact the quality of projection one will obtain and the appropriate projection method.

If using a dedicated projection room, an inclination towards frontal projection would be more likely. On the other hand, if the projection takes place in a bright room or in broad daylight, rear projection would be preferred. Likewise, rear projection proves to be an ideal solution for presentations, exhibitions, or even conferences. Thus, the presenter moving in front of the screen can interact with what is projected on the screen without obscuring the content.

And then, which screen to choose?

Once the projection method has been decided, it is essential to select the appropriate screen type. Each display is designed to meet specific needs, with some being versatile for any type of environment, while others have special features. Most screens can be customized as needed.

Regarding the choice of projection surface, a wide range of canvases is available, compatible with both front projection and rear projection. Additionally, some canvases even accommodate both projection methods, providing optimal flexibility in choosing the projection configuration.

Publisher: Multivision Screens

January 2024