[opendtv] Re: HDMI from STBs
- From: "Donald Koeleman" <donald.koeleman@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 4 Jan 2006 21:18:36 +0100
Thanks Jeroen,
I guess this must be the one. It didn't say at the cover, but it does say in
the full table of contents for what is now a back issue (jan/feb is out and
downloadable).
http://www.theperfectvision.com/back_issues_65.html
90 Sony HCS-W80 ChromaVue Projection Screen
A black projection screen? That's right! Sony's radical new screen
technology lets you watch a front projector in broad daylight. Gary Meson
brings you the scoop on this groundbreaking product.
DNP has also been marketing a simillar screen (gain 2.0, contrast 20:1), and
just announced an electrically driven version one or two weeks ago.
www.supernovascreen.com. Watch the brief video demo.
Hotspots may be an issue.
Polarized screens will only work with lcd projectors, not with dlp's (does
LCoS use full light or just half?).
What I personally have always disliked about RPTV and lcd monitors is the
fact that they have a foil screensurface, now even the high-end plasma's
have started to replace glass by filmsheeting;-(.
Donald
----- Original Message -----
From: "Jeroen Stessen" <jeroen.stessen@xxxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Wednesday, January 04, 2006 5:18 PM
Subject: [opendtv] Re: HDMI from STBs
Hi,
Donald Koeleman:
> Bert, what is that magical black projection screen article about,
> that's listed in the tvp contents on their website?
I don't know which one you are referring to, but I know of a front
projection screen that Sony is marketing, which is spectrum
selective to reflect mostly the wavelengths that are emitted by
the projector lamp. Thus it has high reflectivity for the image,
and lower reflectivity for the ambient light. One colleague of mine
thinks that it works only marginally. Another option is to use a
polarized screen, making use of the fact that the light from an LCD
projector is already polarized but ambient light is not.
Rear projection screens are more easy to make black: they use a
lenticular screen to spread the light horizontally, and thus the
light comes out of narrow slits. Then the space between the slits
can be painted black (from the front) with a black matrix. Thus
the transmittivity from the rear is high, and the reflectivity
from the front is low. I think that you can always do tricks like
this if the desired (image) light comes from one point (the lens)
and the undesired (ambient) light comes from all directions.
Greetings,
-- Jeroen
+-------------------------------+------------------------------------------+
| From: Jeroen H. Stessen | E-mail: Jeroen.Stessen@xxxxxxxxxxx |
| Building: SFJ-5.22 Eindhoven | Deptmt.: Philips Applied Technologies |
| Phone: ++31.40.2732739 | Visiting & mail address: Glaslaan 2 |
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| Skype: callto:jeroen.stessen | Website: http://www.apptech.philips.com/
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