I keep reading posts about the "Velux Treatment" performed on Samsung DLP's. Many have marveled at the end result but nary a single measurement has been posted to support any claims of picture improvement.

I am curious about what this "treatment" involves as Velux is the trade name of a manufacture of various window products including including skylights and sun tunnels and not a specific treatment or product. Most importantly what physical properties are being effected by the process that actually improve the picture? The only one that seems possible would be ansi contrast as it appears to be the weakest performance characteristic of this line of tv's.

I'd like to see some verifable numbers to support the claim that this mod actually can "improve" the picture on a Samsung DLP. sInce this mod is being performed by ISF calibrators there should be no issue sharing some before and after measurements

It's only going to work if the interior is grey or something other than flat black. Why a manufacture would NOT have a interior surface that could reflect light be anything other than flat black is beyond me in the first place.

It's only going to work if the interior is grey or something other than flat black. Why a manufacture would NOT have a interior surface that could reflect light be anything other than flat black is beyond me in the first place.
Greetings,
I had my Samsung hl-p5674 lined in Velux by Eliab @ www.avical.com last fall. The interior of the cabinet was in fact the same gray color as the outside casing.
My original intent was to utilize Eliab's custom foam panels to reduce interior reflections, but due to the internal size and layout of my set they did not fit. Instead, Eliab did a customized velux installation.
Velux is a trade name for the type self adhesive blackout material that he used in the installation. I did notice an appreciable difference in black level but unless someone were to tell me how to calculate contrast ratios I'm not sure I could quantify the results.
YMMV,
b.

Yes internally lining the cabinet of an RPTV with duvetyne or similar improves ANSI CR performance.

Why a manufacture would NOT have a interior surface that could reflect light be anything other than flat black is beyond me in the first place.

The answer is simple (and obvious): $$$$$$$$$$$$$$$$$$$$$$$$$$$$$ !!!

NOTHING is absolute black, everything reflects SOME light. Duvotyne just reflects A LOT less light than the typical black paint manufacturers use in their sets.

It's only going to work if the interior is grey or something other than flat black. Why a manufacture would NOT have a interior surface that could reflect light be anything other than flat black is beyond me in the first place.

Even if the interior is black, it likely reflects significant light. The reason that manufacturers build sets that have internal reflections is the same as why they use things like mylar mirrors that are horrendous...like the previous poster said, $$$. Some sets can be significantly improved with light absorbing materials like duvetyne, but it would be nice to see some numbers. Another factor that makes this problem much worse is excessive overscan. This likely makes more difference in many sets.

Let me add another wrinkle to the internal reflection thing: Adding better internal light absorbing will also help daylight operation. Believe it or not, the light from outside the set comes in the screen and bounces around inside and washes out blacks from inside.

Hard numbers could be produced using the checkerboard contrast pattern. Adding the impact of external room light might be a little more difficult as one would need to control the intensity of that light and one might be unsure if the measurement device was seeing light only from the display, or if some extraneous light was sneaking in to the sensors from the room.

Very good point, Dave. As a service tech I see this all the time working inside sets. In fact, too much light on a screen can cause errors in auto convergence operation. At least that is what the vendors say. I never had the problem but never tried using it in such conditions...

I keep reading posts about the "Velux Treatment" performed on Samsung DLP's. Many have marveled at the end result but nary a single measurement has been posted to support any claims of picture improvement.

I am curious about what this "treatment" involves as Velux is the trade name of a manufacture of various window products including including skylights and sun tunnels and not a specific treatment or product. Most importantly what physical properties are being effected by the process that actually improve the picture? The only one that seems possible would be ansi contrast as it appears to be the weakest performance characteristic of this line of tv's.

I'd like to see some verifable numbers to support the claim that this mod actually can "improve" the picture on a Samsung DLP. sInce this mod is being performed by ISF calibrators there should be no issue sharing some before and after measurements
My business partner David Abrams and I experimented on my old Samsung HL-R5078W DLP display as it was gray and we felt the internal reflections could probably be lessened. We began with Duvetyne and later moved to Velux which is a material that's actually darker, more light absorbing and therefore less reflective than Duvetyne. It is essentially the same material that Stuart Filmscreen uses to line the bezel of their screens.

Using the 4x4 checkerboard pattern on my Accupel generator at video levels and 1080i via the DVI output (using a Gefen HDMI adaptor) and a Minolta LS-100 light meter, we were able to quantify a CR improvement of about 8%. I then advanced the technique further by designing custom panels that "snapped" into the set thus eliminating any dead space. I will provide a picture of this later today as it's on my other laptop. ;)

I've not tried this technique on the newer HL-S displays however.

Eliab

Hello all,

Here's the pic of my custom Velux/Foamcore board panels that I had mentioned in the previous post. While these worked for the HL-R series, I haven't yet tried them in the HL-S series as they would require different size panels. I'm also no longer providing this service. The material can be purchased here (http://www.mcmaster.com/) . The part number is 88015K26. They refer to the fabric as "VELVET FABRIC, .030" THICK, 45" WIDE, ADHESIVE BACKED."

http://i11.photobucket.com/albums/a173/Eliab/V-panels.jpg

Eliab

Hello all,

Here's the pic of my custom Velux/Foamcore board panels that I had mentioned in the previous post. While these worked for the HL-R series, I haven't yet tried them in the HL-S series as they would require different size panels. I'm also no longer providing this service. The material can be purchased here (http://www.mcmaster.com/) . The part number is 88015K26. They refer to the fabric as "VELVET FABRIC, .030" THICK, 45" WIDE, ADHESIVE BACKED."

Eliab

You don't offer it anymore? After I saw this thread, I was gonna let you try in on my HLS next week... :eek:

My Sony XBR2 (RP) just got the velux treatment along with an ISF calibration from Chad B. It was worth every penny. My thanks to Eliab for the links.