Hi. This video is a continuation from the previous one where I tore down this dumpster-dive TV and how to play around with it, turn it into a light panel and measuring some stuff and things like that. So if you haven't seen that video, click here and check it out before watching this one and we can get these clips off around the side here and we can get this plastic bezel off to access the LEDs and the layers in here. Now if you haven't seen these films before, there's actually a lot of Technology which goes into these.

You can see there's four separate layers here. On the bottom, we have a diffuser sheet. It's like really thick. that's like a thick polycarbonate.

There's nothing too special about that diffusion played. It is like got a roughed-up surface and stuff like that. But then we get onto these films and these are absolutely fascinating and I'll link in some data sheets for these. They're made by our 3m and other companies and what they are is what they're called is prism films or our brightness enhancement films.

And they're actually little prisms in there. Like there's millions of them and they reflect the light, diffracted all sorts of things so it gives you an even surface and you'll notice that these are different types. So I'm not sure which ones what, but they've obviously determined that they've got a main diffuser plate and then they've got three different types of brightness enhancement or prism films here doing various stuff and and they really are very cool Technology: They're not just plastic, there's little prisms in there actually. this first layer here is definitely a prism film.

Look if you have a look at my finger through there, it's really interesting. The properties are going to change so that that really looks like it's definitely doing the prism type effect. If you have a look through maybe you'll see multiple it look I have I got more than five more than four fingers there? Maybe Anyway, it like it read diffraction, reflects the light and does all sorts of stuff. These so that's definitely a prison film and then this second sheet here not as interesting but it looks like some sort of prism film as well and this top one is doing something different again and that's more opaque.

But they've determined that they need all four layers like that through lots of science, lots of trial and error and you know getting the best uniform approach and based on the number of the leads they need actually behind this sort of stuff. and these are used on both the direct LED backlight one which is the type we'll see here and also the the edge lit ones which I've done a video tearing down an edge light LCD screen before and I'll link that one in. Now for the big reveal. where's the LEDs Where's Wally Well they're not edged.

look at this. Wow, isn't that awesome. There's a close-up of the lens and they've actually got an interesting concave type arrangement in there. I'll show you another view at the moment.

you might be able to see that, but yeah, they're really anchored in this. If we look under the hood, there we go. they're just surface mounted onto the PCBs there. So they've got various PCB strips going all the way up.

They're pretty easy. They've got a real interesting concave lens on that. Look at it. Fascinating.

Now of course, at this point you might be thinking, well, what is the best use for these things if we've got a big PCB strip along here? Well, you take these out and you can use these for bench lighting. or for you know, like under bench lighting for your lab or your kitchen or a vanity mirror or whatever. I think they're much more useful than just the panel itself. I'm interested to see what sort of pattern we get out from these individual our concave lenses in here.

So I think that's a better use for this is just to rip it all apart and get these cool. let's trips out. Let's go. We've got these little plastic retaining clips in here.

You just squeeze those and push them through and then the paper backing you'll just come off. or you could just rip it. Bingo. Room like, clean and check it out whether it is split in the middle.

So two, four, five, and four. so they're not exactly even. But we've got one, two, three, four, five strips of five, leads each and five strips of four leads each. And if we have a look at the wiring here, here's our two pairs coming in.

One pair goes - here goes along there loops back and then bingo. It's got a loop there. so it basically terminates this one. so that's going to full strips and the other one has loops up here or back around and ends over here.

So this one has three strips and this one handles two. Now one of the main problems about these is - getting them out to reuse is that they are stuck. They are stuck down. But if we give it a jiggle, that one came up, that one's that one's up.

That one swore. But then again, I don't like doing the lens. I Don't know how the lenses stuck onto the board, but anyway, you've got to be careful. This may be start prying it up, but mmm gotta be careful.

But if you just wanted to keep it as a light panel, then of course you wouldn't have to do any of this. It's only if you want to try and get the strips out of them, you can actually get a screwdriver in there and start to leave for these puppies up. But yeah, you got to be very careful and you'll find if you want to get these up. Cuz this double-sided tapes really annoying.

I've got my hot air gun. It's only set to a hundred, but yeah, you can get in there. It does soften the glue fairly easily and these lifts up. Then they actually start to come up fairly easily.

But yeah, what is it? 902 6e tape? Whatever that is. Kaity 902 Six C double-sided tape. Anyway, Bit a hot air or get it up melts the glue and you'll notice that there's no copper on the back. It's not an aluminium bored or anything like that, so they're not using that as they're not using the back panel as a heatsink.

and they don't have thermally conductive adhesive in there, so they're just relying on the copper. You might be able to see the the copper strips in there either side. just to dissipate the heat from the lead in the copper strips, get a good view of the lens there. Yeah, Wow Look, it almost goes right down to the die Wow So that's it.

It might have an interesting spread on that. Anyway, these are, you know, Lux. They've got LG on them so now we can actually drive one of these strips with a constant current art supply. It got my Keithley to T5 cost a current source here B Can use any LED strip a driver short the end of course because they're in series so you've got to actually loop the thing back and then I've got it set to white ten milliamps and I'll turn our compliance voltage up because they're going to be three three point something odd volts per lead and bingo, we're on with Ten milliamps and there you go.

And the real fascinating thing about these is look. they're basically side emitters 360 degrees side emitters and this is fairly bright if I put my either blinding, but I can look I can put my eyeball right over the top of that and you can see the lead down in here, but it's basically nothing. There's hardly any. let's see a little pinprick of light in there.

Absolutely fascinating, but it's all coming out beside complete side emitters. You might think that they come out the top. they don't That's why that concave lens, that's what the concave lens does is designed to funnel light outside cool. But of course, the problem with side emitters like this is that they're effectively useless for under shelf lighting and stuff like that.

I Was hoping I can get these strips out, put them all in series, and use them to light up my bench, but they're They're not that great if you want the light coming down on your work area. If you want some sort of architectural lighting or something like that, they could be really cool. but in this case, in this particular LG TV I'm not sure if it's the same across all modern our LCD TVs but this one. yeah, it's yeah.

it just goes out the side and hopefully you can see this. I've got constant exposure on the camera. You can see the light on the wall over there like that as they put it on the side and then it really goes to town over saturates the camera. So yep there.

Unfortunately, that's just how these things work and if you have a look, you can see tiny little pinprick. there we go. and then WHAM saturated cool Oh huh? It turns out we might be able to actually get these off fairly easily. get under there what? flippy? Doo Dah and we're in like Flynn You can see that they've actually heat state to these by the looks of them look.

but yeah, that came off, that came off pretty easy and that's just an adhesive strip. So there you go. Yep, we've got a standard surface mount Led there, but it all the magic of course is in the lens and check that out. Hmm, neat huh? Sure, there's a lot of engineering that goes into that, so bingo.

We now have our LED strip and there we go there. Well yeah, that they're actually fairly wide emitters those ones so they could be really good for under bench lighting. You can see a bit of a hotspot thing happening there up close, but take them a fair way back and they're actually quite nice. There you go.

I Just stuck them under the bench there and that that's pretty decent. Apart of course from the color balance and I have color balanced my camera and yeah, it, it does have that bluish tinge to it, so what you're seeing on screen is probably quite accurate so that's a bit of a shine. But apart from that, the the patent is really nice and even I like it and check it out. Even at 1 million, um, these things light up okay and if I change it I can change that to naught point one milliamp I camps and even ten micro amps they're still on.

and at one milliamp they drop in are five point one volts. So yeah, you need a fairly high compliance voltage for the entire stream and that jumps up to five point eight volts of a hundred milliamps. So the most I can do is eighteen with my hundred volt compliance. For DJ Keithley two to five, there ain't nothing you can't fix with enough compliance voltage.

You might have noticed these dark dots right around the outside of this white backing sheet here that reflects the light back up because remember each individual lead just emits from the side like that. so it's got a like bounce off the bottom and up and everything else. So what the what? the function of these would be doing would be stopping the light reflecting off the side because they are curved up like this. so it's in there like that.

so it's curved up to stop reflections back and getting bright patches on the edges like this and you'll notice that there's actually a pattern to the dots. Look, they actually get larger up here. So they've This is like, trust me, this would be scientifically designed to, you know, gradient. It's like a gradient going up and leave.

Dots get larger and larger and larger and the pattern fill. I Don't know why they've gone out like that. Maybe it's some sort of trap or something like that, but yeah, they're definitely doing this pattern to absorb the light and not have it reflect back and get really bright patches around here. It's a lot of engineering has gone into this thing.

Let me tell you, they've spent a lot of years perfecting this. and there you have it. under bench lighting. Beauty from her dumpster diver.

TV So next time you see one of these things on the curbside or in a dumpster or whatever, um, definitely get one and rip the lids out of the thing and have a play around. You can use them for all sorts of purposes. not only a light box or whatever, but dub. Yeah, under bench lighting, architrave, or some other lighting system.

so there's definitely some usable LEDs Inside Modern LCD TVs Either the backlit version like this or the edgelet version either done in a nother video which I'll link in there both have usable LED strips in them and you can use them for all sorts of weird and wonderful purposes. So if you enjoy this video, please give it a big thumbs up. Catch you next time. There's a LED strip all the way along the bottom all the way, so it's only one side of and we can see that on this.

Dave CAD Drawing here we've manufactured whether they're you know, chemical edge Liza retching as well. It actually turns up much better on camera. Looks like it has lots of magic in there. Tie Me Kangaroo! This film is very interesting folks.

Look at this at a really shallow angle like this. It is.