17 replies to this topic

[scotia]

Is it okay to install the projector screen in front of a window without blind? Can the screen itself be a good blind for the window?

[bbar]

No, very bad

[scotia]

Thanks for the info. Looks like I need to install a blind first.

[bbar]

Yep and would be better to use something that can let no light through as light does pass through screen and will affect the pq.

[yorac]

As a minimum you would at least have a blockout curtain over the window.............

[:)]

At work we had tint professor come cover over a window with block out film. Works fine with a screen infront.

[bbar]

:), on 06 May 2013 - 12:26 PM, said:

At work we had tint professor come cover over a window with block out film. Works fine with a screen infront.

Can also get a piece of foam rubber from Clark rubber and use as an insert. Then full light blockage

[Highjinx]

I'm going a bit against the flow here......if the screen does not transmit light from the back to front and the screen covers the full window......there should be no reason it won't work, specially at night.

During the day...the light that filters around the perimeter could act like bias lighting(as long as it is not too much light), closing the eyes iris increasing percieved black levels.....as long as this light does not bounce off the walls and get back to the screen...if it does, add a block out roller blind with U channel guides LHS/RHS with pelmet.

[davep]

I'd be a bit concerned about UV degradation of the screen if full sun is hitting it throughout the day.  Similar situation here, but I installed a heavy vinyl over the window, floor to ceiling (which although a few mm thick, still lets a slight bit of light through during the day).  I did used to have the blockout tint, but after the windows throughout the house were replaced with new ones, I didnt want to have the tint on the new window.

[Quark]

bbar, on 06 May 2013 - 12:30 PM, said:

Can also get a piece of foam rubber from Clark rubber and use as an insert. Then full light blockage

This is my dirty little secret for stopping light leakage at the bottom of the curtains covering a 5m window.

[bbar]

Quark, on 06 May 2013 - 04:37 PM, said:

This is my dirty little secret for stopping light leakage at the bottom of the curtains covering a 5m window.

Lol, yep,  but it is no longer your secret!

[oztheatre]

davep, on 06 May 2013 - 03:15 PM, said:

I'd be a bit concerned about UV degradation of the screen if full sun is hitting it throughout the day.  Similar situation here, but I installed a heavy vinyl over the window, floor to ceiling (which although a few mm thick, still lets a slight bit of light through during the day).  I did used to have the blockout tint, but after the windows throughout the house were replaced with new ones, I didnt want to have the tint on the new window.

Yes absolutely. Daily sun on many things can cause bad fading. With vinyls they can turn yellow and after long periods completey crumble. If the back of the screen was black for example, and the area in behind the screen didnt get much air, it would make the vinyl very very warm.

The cheapest option, if the screen is going over the window completely is just a piece of 3 pass blockout pinned to the frame of the window.

[JWB]

I have a pull down screen in front of a bay window that has roll down blinds that let a little sunlight in at the edges.  The screen itself provides enough blockout to display a good picture.  Granted the picture may not be as good as watching at night but it's still a pretty good compromise for a living room setup.

[beejay76]

Projection screens can come with an optional opaque backing for such applications...but better to stop the light getting into the room in the first place via use of shutters, curtains, or both (I use both).

[bbar]

beejay76, on 07 May 2013 - 12:28 AM, said:

Projection screens can come with an optional opaque backing for such applications...but better to stop the light getting into the room in the first place via use of shutters, curtains, or both (I use both).

that would be cool though not mainstream.

I have read on other forums that one should even paint the wall behind a screen matte black even if rest of wall is another colour to minimise light bouncing back off the wall back through the screen as it reduces PQ.  Probably does but one of those that it probably reduces <1%.  so true yes, but noticeable who knows.

[oztheatre]

beejay76, on 07 May 2013 - 12:28 AM, said:

Projection screens can come with an optional opaque backing for such applications...but better to stop the light getting into the room in the first place via use of shutters, curtains, or both (I use both).

They're not made with a backing for that reason. The reason is to stop light from the projector traveling thru the screen, onto the wall, back onto the screen and washing it out.
Nothing whatsoever to do with covering windows.. though some may use that reason as a selling point.

[Highjinx]

Here is something on bias lighting....seen it done with projection also.

http://biaslighting.blogspot.com.au/  Pro's

http://www.avsforum....rojection-setup  Con's

Q:
however, would either of you recommend bias lighting for a FP setup?

A:
Not typically required or recommended, but some unusual setups may benefit from it when conditions include elements already described in the thread.

[mmu16]

bbar, on 07 May 2013 - 07:36 AM, said:

that would be cool though not mainstream.

I have read on other forums that one should even paint the wall behind a screen matte black even if rest of wall is another colour to minimise light bouncing back off the wall back through the screen as it reduces PQ.  Probably does but one of those that it probably reduces <1%.  so true yes, but noticeable who knows.

I did this and i can vouch for its effectiveness.