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Projector Use with Lights
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Hi
It's done and people rave and hype about great results. The reality is that PJs and day light is a losing proposition. You can make it work but ... the results are suboptimal in most cases. Of course they make Light rejection screens and their performance are at best acceptable.. YMMV..
At the current price of large screen TVs .. I have to wonder why bother...
peace
It's done and people rave and hype about great results. The reality is that PJs and day light is a losing proposition. You can make it work but ... the results are suboptimal in most cases. Of course they make Light rejection screens and their performance are at best acceptable.. YMMV..
At the current price of large screen TVs .. I have to wonder why bother...
peace
OP
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The technical side of projector use is not compelling.
There are many downsides to reasonably-priced units, and heavy tradeoffs between types of projectors, not to mention types of projector screens.
There are speciality charcoal and gray screens made by Stewart Filmscreens that aim to address these problems, beyond even the usual method of blackening everything else in the room. I'm sure there are more tradeoffs associated with using them instead of the standard white.
There are many downsides to reasonably-priced units, and heavy tradeoffs between types of projectors, not to mention types of projector screens.
Like you say, there are minimums to contrast set by light levels in the room and by the color of the projector screen.You can't project black.
There are speciality charcoal and gray screens made by Stewart Filmscreens that aim to address these problems, beyond even the usual method of blackening everything else in the room. I'm sure there are more tradeoffs associated with using them instead of the standard white.
Yes You can
... or a bit overt the top or under if you will
Else, ALR (Ambient Light Rejecting) screens are your answers. You still can't project black so contrast is limited and there is basically no "black" level ... I am not a fan, but these may suit your purposes.
Good luck in your endeavors
Look at a projector screen in daylight with nothing projected onto it.
That is the blackest "black" you can ever get on that screen in that lighting.
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Have you researched selective wavelength reflection thin film optical filter screens matched to your projector technology?
Just like ASR light and video are governed by measurements.
Just like ASR light and video are governed by measurements.
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You'll still see the blackest black that screen can produce. It'll just be blacker. (or darker grey)
I've not seen one - so have no idea how good they can be.
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Yes, I've researched, but getting specific answers is hard. I'm far more comfortable with audio than video.
One small complaint is that there are close to a dozen brightness units that may or may not easily convert from each other, making comparisons difficult between TVs, projectors and light meters. I used an app called Photo Friend to measure the ambient light in my room and converted using this calculator: https://calculator.academy/lux-to-nits-calculator/ The relevant units I used, depending on what was available, to compare my room measurements to spec sheets and reviewer measurements are ANSI lumens, ISO lumens, lux, nits and foot-lamberts.
For throw calculations I used
www.projectorscreen.com
The brightest combination is an ultra short throw projector mounted regularly, i.e., sitting on a cabinet, with a fresnel ambient light rejection screen, followed by a lenticular ceiling light rejection screen. Both of these will have light gain coefficients over 1.0, so any light reflected will be brighter than the source, which again set the lowest black level higher than it would be in custom built black bear dens where most projectors excel using matte screens, with gains of around 0.5.
There are other consequences. In my specific room I need the projector to be ceiling-mounted. The viewing distance is around 3 meters on-axis, and there are two couches 30-40 degrees off-axis at a similar distance. Fresnel ALR screens require standard mounting and cannot be mounted upside down because their focal point assumes a specific viewer position at the center of the screen, and at around 45 degrees off-axis the light rejection is close to maximum, so the screen will be severely darkened.
Lenticular CLR screens don't have this specific issue, but cannot be mounted upside down, or can be, but not with overhead lights, since they will amplify that as well as the projection at the same time.
So that leaves short throw and long throw projectors. Many of these, even the most expensive, don't have enough brightness.
Anyway, I'm just wondering if anyone has actually pulled this off and is happy with the results.
One small complaint is that there are close to a dozen brightness units that may or may not easily convert from each other, making comparisons difficult between TVs, projectors and light meters. I used an app called Photo Friend to measure the ambient light in my room and converted using this calculator: https://calculator.academy/lux-to-nits-calculator/ The relevant units I used, depending on what was available, to compare my room measurements to spec sheets and reviewer measurements are ANSI lumens, ISO lumens, lux, nits and foot-lamberts.
For throw calculations I used
Projector Calculator | Projector Screen Calculator | Aspect Ratio Calculator | Screen Size Calculator | Distance Calculator - Projector Screen | Projection Screen
With our free projector screen calculator, you can find the perfect screen size for your needs by calculating viewing distance, aspect ratio, and more. Get started today!
www.projectorscreen.com
The brightest combination is an ultra short throw projector mounted regularly, i.e., sitting on a cabinet, with a fresnel ambient light rejection screen, followed by a lenticular ceiling light rejection screen. Both of these will have light gain coefficients over 1.0, so any light reflected will be brighter than the source, which again set the lowest black level higher than it would be in custom built black bear dens where most projectors excel using matte screens, with gains of around 0.5.
There are other consequences. In my specific room I need the projector to be ceiling-mounted. The viewing distance is around 3 meters on-axis, and there are two couches 30-40 degrees off-axis at a similar distance. Fresnel ALR screens require standard mounting and cannot be mounted upside down because their focal point assumes a specific viewer position at the center of the screen, and at around 45 degrees off-axis the light rejection is close to maximum, so the screen will be severely darkened.
Lenticular CLR screens don't have this specific issue, but cannot be mounted upside down, or can be, but not with overhead lights, since they will amplify that as well as the projection at the same time.
So that leaves short throw and long throw projectors. Many of these, even the most expensive, don't have enough brightness.
Anyway, I'm just wondering if anyone has actually pulled this off and is happy with the results.
LG can.
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OP
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$90k USD starting, later discounted snd then discontinued. Each was made to order. Would have been nice (not that I could afford it).LG can.
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It would be perfect for my room, at a sane price. I expect it's been abandoned, but multiple generations later I could have been interested.
