Inside a cheap LED projector.

  • 🎬 Video
  • ℹ️ Published 6 years ago

One of the show's projectionists brought through a cheap LED projector he had bought to try. He was disappointed at the intensity of the image, and it really isn't that great for anything other than a very dark room or an image of around a metre across (about 3 feet).
The light path is from a well cooled rectangular LED firing into a collimating assembly and then going through a polarising filter, LCD panel and fresnel keystone correction lens before bouncing off a front silvered mirror and exiting the unit via the focusable lens. The construction was pretty good and it gave usable results for a low-key application.

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💬 Comments

Would love to see a comparison video showing the internals of a high end equivalent. Though I rather suspect there would be some logistical challenges in Clive obtaining one? I have to say Clive, your channel content is going from strength to strength lately. This was really very quite interesting!

Author — Mark Blackmore


That's really interesting...I know I have a little "pico projector" I think it was Optoma but not sure but it's about what you described with this one, good enough for something the size of a normal TV but not a lot more. I know one thing I've found with most of these mini LED projectors is they have to "warm up" about 10 minutes before you focus them because the plastic lenses and components seem to change shape slightly and throw off the focus.

Author — Matthew Miller


Bought one of these off eBay a while back. They work great in pitch black, but it takes very little light to wash it out. Nice to see what they look like inside.

Author — Sienile


Sir, Indeed thank you, just subscribed. what makes this channel special is the short, clear, theory+hands on approach. reverse engineering is done here in the best way, please keep posting, God bless you.

Author — hypertuch


That reminds of the first prototype projector, a guy used a standard slide projector, he got hold of a LCD (monochrome at the time) that was about the same size as a slide, and successfully projected an image, he was thinking of stacking 3 lcd's somehow, of different colours, but the focal length of 2 of them would have been out.
I have since searched for it without success, it was i think on Tomorrows World.

Author — Sparky Projects


I have one of these, really for the $75 Canadian I spent, it's pretty decent. I've got it projected to about 100" and yes, it's dim and dark scenes are difficult to make out but it works decent in pitch dark playing retro video games through (Zelda ocarina of time :D )

Author — Chris Dwyer


Hey man, I like to watch you teardowns of these kind of items :) I have same projector as this and was thinking if its possible to change LED to something more brighter? Any ideas? Maybe you can make a video :) There would me so many people to want to watch it :P

Author — Paulius NoName


Hi Clive, hows it going? hope things are good. Just an idea... i wonder if that chip board could run a higher wattage LED. If so do you fancy putting a 50w led into it and see if that improves things? All the best

Author — DiyEcoProjects


You can turn the brightness up on this if you cut out some of the grill by the fins for better air movement, I've also added an additional external fan to help pull the air through. If you turn the brightness up without increasing the airflow you may see some heat issues on the screen after some use. Sometimes just making sure the internal fan and the air intake vent at the back are clear of dust can give extended use before the heat blob shows up on the screen.

Author — Chris Wilson


I had a similar one of these LED projectors. Unfortunately it broke after a year. The image was poor and the dust got into the lenses. It has a 10w LED and the thing what failed wasn't the LED, it was the driver. I now has a £350.00 Acer projector with 2400 lumens and it is much better.

Author — Xenon777


This reminds me of the DIY projectors like 10-15 years ago. Only back then we were using 200-300W Halogen lamps instead of LED's.

Author — Dima Oliynyk


It's 2023 and I got a cheapy one that's half the size, shockingly bright... It's amazing how tiny and cheap they are! It's 1080p and does up to 105" in pitch black conditions, which is insane... Imagine what we'll have by 2030!

Author — DoctorX17


I'd love to see you up the light with some extra led's, that would make for an interesting project.

Author — MobiusHorizons


Wow. Exactly what i wanted to know in a small clean video. Thanks bro.

Author — Ari Prasath J


Not as granular as some of your videos, but still quite enjoyable!
I love crap like this, but mostly when it's someone else's!

Author — Michael Thompson


If this is like the old LumenLabs projector plans, the main purpose of the "polarising filter" just before the LCD is to filter out IR to stop the LCD overheating.

Author — MattOGormanSmith


Hello !

Thanks for your trick for checking the type of metal in the wires ! 👍👍

Author — Eddy Fontaine


I've seen much worse - one that claimed to be an OLED projector but was in fact LED lit DLP, extremely noisy, dim and cost $400! I ended up getting a refund for false advertising as I found the rainbow effect unbearable.

Author — youtubkeeper


That's all very interesting but tell me this: If you break inside a set of bagpipes is there a chip inside that requires them to play "Scotland the Brave" every time you start them up? I'm guessing the expensive models have circuitry that identifies when it's appropriate to play "Amazing Grace".

Author — Herman Von Petri


Cut out original COB & housing and affix 4000k CXB3590 CRI90 with pin heatsink and aftermarket driver in its stead for an upgrade in lumens? Would require a bit of DIY, but would it work as anticipated or would the circular pattern cause corner darkness? Awesome show, fuels the curiosity :)

Author — Chief Running