Hi everyone, I think Ive read almost every post on here and want see if my plan is correct.  I made a sketchup graphic of the way I think I should build my table, but I haven’t seen many photos of actual working LCD screens.  I don’t want to build a projection setup for 3 reasons.  #1. a projector is too expensive.  #2. I want to keep my MT as small as possible. A 17” or maybe a 19”.  #3. I already have an LCD dismantled for this.  I’m open to another method, DI or LLP if they would be easier/cheaper for a first run.  If you guys would take a look at my model and tell me what you think I would greatly appreciate it.  If anyone wants I can post the Sketchup file so they can manipulate it for better viewing.

seems suitable.

try to test your diffuser. mine was blocking ir so i need to search a different one.
also i had to remove some other layers which where in the lcd at first.

good luck

Hello Mark,

I´m on the way to build a similar one, but I use the DI method.
Have you kept in mind that the lcd screen has the board and connector pins?
I`ve one question about the backlight and the honeycombs...let they pass the Ir-light?
And another thing is maybe when the backlight gets hot...do you need then a cooling system??
in my project i use 2 halogen lights as the backlight and there i will need the cooling system.

greetings Henrik

my testsetup

here you see that i only have the honeycomb and the lcd. no diffuser yet. thus a suboptimal picture

this shows my test setup with 2 selfmade ir “distance"sensors.

i need to replace those cables by longer ones. any ideas? probably solder new adapters but i hope it
does not affect signal quality

I did have to remove the opaque white layer that was behind the backlight.  I have yet to set up the web cam and install the software, so I don’t know about IR transparency yet.  As far as going with a DI set-up I’m a bit concerned about IR “leakage”.  If we are showering the back of the screen with IR and have nothing to block it, won’t that be a problem.  I don’t fully understand the DI method.  I think my brain has gone soft from reading so many posts.  I also thought about using a different light source to illuminte the LCD like you are doing Henrik.  It seems simple to mount some other type of backlight in the cabinet and to use an IR blocking film or filter at the light source to prevent it from ever entering the case, but I haven’t seen anyone else try this yet.  I have a bad habit of re-inventing the wheel on every project I start and was hoping to avoid that on my first screen.  I did keep in mind that I will have circuit boards to deal with but they won’t be an issue.  Woodworking is my first hobby and the cabinet can be made any way that I choose as long as it fits in the existing space I have for it.  FYI, I’m building this screen to turn a stereo cabinet that my grandfather made in the 40’s into a jukebox and am not willing to modify the cabinet itself.  I plan for this to be a drop in component that will look like it was made with the original piece.

The first idea of two halogen lights are near by.
Today i exchanged them to 26 bright led´s because they emit no Ir-light!
in my thred i will pst some screens

greetings henrik

I sugest trying tissue paper that is used for wraping presents for a defuser. It doesn’t block IR and a couple of layers should do the trick.

I personally would leave the ribbon cables the way they are and see if the board could be monted on the inside of the frame out of the way personally. I’ve worked on simmular cables in the past and hated the entire process. Perhaps look into some type of extention cable to attach to the board?

In a few months, I plan on atempting something like this. I found a couple of IR cameras on the internet that were reasonably priced. just do a search for mini spy cameras. Since they are specificly designed for IR imaging, they may provide optimal if you have a PCI card that supports that type of input.

This issue has been discussed many times over in here. nima, me and many others have successfully built LCD FTIR and DI setups, mine is the same exact like this but FTIR. For back light, use the original lights that came with the LCD, they do not emitt ay IR at all. Do not use IR blocking film, fire hazard under this setup…

I’ll find some posts that discuss this in detail and link ‘em up here shortly.

UPDATE:
http://nuigroup.com/forums/viewthread/2258/

http://nuigroup.com/forums/viewthread/2466/ - This post answers your questions clearly