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Topic: Rear Projection from Indoor to Outdiir via Smartglass
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Joined: Oct 30, 2015
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Hello to all. As we are very skeptical about this application during daytime, I am seeking advice and tips from anyone that has witnessed or installed something similar.
Our customer has asked us to propose, for his retail facility, a rear projection solution from indoor that will be seen outdoor from far away via smartglass/film - when "on" transparent, when "off" opaque and used for projection.We have received a suggestion from the Panasonic dealer to use a PT-RS11 with Ultra Short Throw lens (sore layout disctates Short Throw configuration). This projector has 10000 FHD lumens on an area of 3.3 W x 2.5 H meter display area which provides 112 lumens per square foor (4000 per sq.meter). Budget aside , is this doable. I realize using this projector it would be very expensive. If it is doable during daytime - then under what conditions
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Joined: Nov 17, 2012
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I don't know much about smartglass but I don't think what you or your client are proposing is possible. Once you turn the smartglass "off", then you will not be able see the image on the other side, or at best very dim and blurry. I think for better results it would be better to go with a LED display of that size.
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Joined: Mar 28, 2005
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I'm not sure what smartglass film is, and the characteristics of it is. You would want to discuss with them exactly what the translucency is of the film, how much light is passes, and if it is suitable for rear projection along with whether it is truly compatible with short throw projectors.

Generally speaking, outdoor illumination, during the daytime, is TERRIBLE with projection. Projectors aren't designed for daylight outdoor use. LED signs, as mentioned above, are better for this purpose, and that is what they are designed to do.

If this was entirely indoors, then there are solutions, but I wouldn't expect a short throw, rear projection, daylight compatible solution to exist.
AV Integrated - Theater, whole house audio, and technology consultation during the build and installation process in the Washington, DC metropolitan area.
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Joined: Oct 30, 2015
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Quote (AV_Integrated on Nov 6, 2015 12:31 PM):
I'm not sure what smartglass film is, and the characteristics of it is. You would want to discuss with them exactly what the translucency is of the film, how much light is passes, and if it is suitable for rear projection along with whether it is truly compatible with short throw projectors.

Generally speaking, outdoor illumination, during the daytime, is TERRIBLE with projection. Projectors aren't designed for daylight outdoor use. LED signs, as mentioned above, are better for this purpose, and that is what they are designed to do.

If this was entirely indoors, then there are solutions, but I woldn't expec a short throw, rear projection, daylight compatible solution to exist.

OK Thanks but if only projected during nighttime may this be an option/ If so under what conditions?/
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Projecting after dark is fine.

Rear projection glass/films need to allow light to pass through the material, while diffusing the light enough to produce a vibrant image that is viewable from all angles. Generally speaking, rear projection softens an image, but still provides a very viewable image.

Image size really will help determine projector brightness. So, I'm not sure about the size you are looking to work with.

The diffusion is a huge issue because a short throw projection setup with rear projection requires that the image properly diffuse, and not all rear projection materials do a good job with ultra short throw.

I know very little about rear projection on materials which can change their opacity, so I would typically talk to a manufacturer and find out what the capabilities of their material is. Some may work very well, but some may not.

It may be extremely expensive to do this the way desired, but for after dark viewing with the ability to switch from transparent to opaque on the fly, it may be one of the cheapest ways to deliver a large image for after dark viewing.
AV Integrated - Theater, whole house audio, and technology consultation during the build and installation process in the Washington, DC metropolitan area.
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