any "lightboost" function for projectors?
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is there an easy way to enable your projector to function as a lightboost monitor in 3d? with the blank or black screen every other frame rather than both shutter lenses being closed for that frame. is this exactly what the BFI is?
is there an easy way to enable your projector to function as a lightboost monitor in 3d?

with the blank or black screen every other frame rather than both shutter lenses being closed for that frame. is this exactly what the BFI is?

#1
Posted 05/04/2014 12:08 AM   
There's no way to do this and actually no real point assuming you have a DLP projector. What's BFI? You referred to it in your other post about EDID.
There's no way to do this and actually no real point assuming you have a DLP projector. What's BFI? You referred to it in your other post about EDID.

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#2
Posted 05/04/2014 04:38 AM   
why is there no real point? asked in case i was wrong to assume
why is there no real point?

asked in case i was wrong to assume

#3
Posted 05/04/2014 04:57 AM   
Lightboost strobes the backlight on the monitor so both lenses of the glasses never have to be black at the same time. Projectors do not have a backlight, they are a different display technology. So lightboost on a projector is not possible, and doesn't make sense. The closest you could get is turning the image on and off 120 times a second, which would give you no benefit.
Lightboost strobes the backlight on the monitor so both lenses of the glasses never have to be black at the same time.

Projectors do not have a backlight, they are a different display technology.

So lightboost on a projector is not possible, and doesn't make sense. The closest you could get is turning the image on and off 120 times a second, which would give you no benefit.

#4
Posted 05/04/2014 06:58 AM   
Correct me if I'm wrong, isn't part of the point of Lightboost to reduce ghosting? The backlight goes dark while the pixels are changing, and bright when they're finished, so you can't see them when they're in transition (ghosting). With DLP, the pixels change almost instantly (even 2D wouldn't work if they didn't), so there's no worry about ghosting in the first place.
Correct me if I'm wrong, isn't part of the point of Lightboost to reduce ghosting? The backlight goes dark while the pixels are changing, and bright when they're finished, so you can't see them when they're in transition (ghosting). With DLP, the pixels change almost instantly (even 2D wouldn't work if they didn't), so there's no worry about ghosting in the first place.

#5
Posted 05/04/2014 07:04 AM   
That's right, the Lightboost is synchronizing a strobe of the backlight with the right moment for the lenses to be open, so that you get much less ghosting. The ghosting happens on LCD because the technology is fundamentally slow, and leaky. It's very hard to get 120Hz on LCD to work well. DLP works by shining light on micromirrors for reflecting a pixels light to screen, or into a black box in the projector. It's about 100x faster than LCD to switch a pixel, microseconds, so ghosting is not a problem on DLP.
That's right, the Lightboost is synchronizing a strobe of the backlight with the right moment for the lenses to be open, so that you get much less ghosting. The ghosting happens on LCD because the technology is fundamentally slow, and leaky. It's very hard to get 120Hz on LCD to work well.

DLP works by shining light on micromirrors for reflecting a pixels light to screen, or into a black box in the projector. It's about 100x faster than LCD to switch a pixel, microseconds, so ghosting is not a problem on DLP.

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#6
Posted 05/04/2014 12:23 PM   
but isn't the increased brightness of lightboost due to the screen being blank for 1/3 of the frames rather than both lenses being closed for 1/3 ? why can't the projector just mimic this?
but isn't the increased brightness of lightboost due to the screen being blank for 1/3 of the frames rather than both lenses being closed for 1/3 ?

why can't the projector just mimic this?

#7
Posted 05/04/2014 09:22 PM   
Pretty sure the increased brightness is because the glasses are open longer. And they can be open longer because of the way the LED pulsing on/off syncs with the glasses. That whole backlight strobing part is key. You obviously can't do that with a projector lamp. It's the LEDs quick ability to flash on and off (and sync with the glasses) that enables this.
Pretty sure the increased brightness is because the glasses are open longer. And they can be open longer because of the way the LED pulsing on/off syncs with the glasses.

That whole backlight strobing part is key. You obviously can't do that with a projector lamp. It's the LEDs quick ability to flash on and off (and sync with the glasses) that enables this.

#8
Posted 05/04/2014 10:14 PM   
Paul is correct. Lightboost isn't actually making the image brighter, it's just keeping the shutters open longer so they block less light.
Paul is correct. Lightboost isn't actually making the image brighter, it's just keeping the shutters open longer so they block less light.

#9
Posted 05/05/2014 06:16 AM   
[url]http://nvidia.custhelp.com/app/answers/detail/a_id/3046/~/how-does-3d-lightboost-technology-work%3F[/url]

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#10
Posted 05/05/2014 01:56 PM   
projectors really ought to implement lightboost to keep the lenses open longer. because as far as i'm concerned the 3d content is far too dark, just like 3d vision 1 monitors. it doesn't matter how "bright" the projector is if the lenses are still being closed the same amount of time. the darkness makes me want to switch back to a lightboost monitor. this idea of keeping the lenses open during the same frame that the projector screen is blank or black should be easy/simple enough to implement and sync with the glasses.. making this same change in a monitor is of course more difficult, requiring hardware changes. i will suggest that projector lightboost can be accomplished with software alone and that nvidia should look into creating it to be applied to all 3d vision projectors. this idea should be bounced off the nvidia 3d vision devs if it for some reason has not already
projectors really ought to implement lightboost to keep the lenses open longer. because as far as i'm concerned the 3d content is far too dark, just like 3d vision 1 monitors. it doesn't matter how "bright" the projector is if the lenses are still being closed the same amount of time. the darkness makes me want to switch back to a lightboost monitor. this idea of keeping the lenses open during the same frame that the projector screen is blank or black should be easy/simple enough to implement and sync with the glasses.. making this same change in a monitor is of course more difficult, requiring hardware changes.

i will suggest that projector lightboost can be accomplished with software alone and that nvidia should look into creating it to be applied to all 3d vision projectors. this idea should be bounced off the nvidia 3d vision devs if it for some reason has not already

#11
Posted 05/06/2014 12:04 AM   
For more brightness, make your projected image smaller, or better yet get a high gain screen. At 90", I too felt the image was a little dark when I first got a 3D projector. So I got a 2.6 gain screen, and that made it perfect.
For more brightness, make your projected image smaller, or better yet get a high gain screen. At 90", I too felt the image was a little dark when I first got a 3D projector. So I got a 2.6 gain screen, and that made it perfect.

#12
Posted 05/06/2014 02:59 AM   
is the gain signficant? i ordered a 1.2 gain screen but i havent tried it yet.. will a 2.6 make a noticeable difference? a "high power" screen has a higher gain rating than the glass bead, 2.8. do you do front or rear projection?
is the gain signficant? i ordered a 1.2 gain screen but i havent tried it yet.. will a 2.6 make a noticeable difference?

a "high power" screen has a higher gain rating than the glass bead, 2.8.

do you do front or rear projection?

#13
Posted 05/06/2014 03:51 AM   
I do front projection. Yes, a high gain screen will make a big difference provided your eyes are close to the light path between the projector and screen. My projector sits on a shelf behind/above me, and I figure I get about 2.0 gain from my viewing position. 2.0 gain means it's twice as bright!
I do front projection. Yes, a high gain screen will make a big difference provided your eyes are close to the light path between the projector and screen. My projector sits on a shelf behind/above me, and I figure I get about 2.0 gain from my viewing position. 2.0 gain means it's twice as bright!

#14
Posted 05/06/2014 04:32 AM   
are you able to clean the glass bead screen if it gets dirty? they say rear projection gives increased contrast and brightness, any idea how much better this would be, and for 3d?
are you able to clean the glass bead screen if it gets dirty?

they say rear projection gives increased contrast and brightness, any idea how much better this would be, and for 3d?

#15
Posted 05/06/2014 04:43 AM   
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