DIY 2880x1800 projector

http://forum.allinbox.com/aspectgeek/Projetsencours/18/photon3k-projector-2880x1800-sujet_9774_1.htm

364 32 12 years ago

forum.allinbox.com

amadeusw• 12 years ago

This looks spectacular!

I didn't quite get how it works. Is it essentially an LCD panel with an extreme backlight, and a lens to correctly display the picture?

valverde• 12 years ago

Yes. Much like many consumer projectors.

userbinator• 12 years ago

Most of them are actually DLP these days, with LCD-based ones occupying the majority of the ultra-low-end (XGA and below).

WestCoastJustin• 12 years ago

Make sure you check page #2 too [1]. More build pics, bulb encasing design, cooling, and thermal images. These guys are pretty good marketers. I want to attempt this, and I am not even in the market for a projector, I mean you cannot get better than this for a DIY project [2, 3].

[1] http://forum.allinbox.com/aspectgeek/Projetsencours/18/photo...

[2] http://i.imgur.com/PoIY7aR.jpg

[3] http://i.imgur.com/SNvdzcr.jpg

sebastianconcpt• 12 years ago

This things are what makes me come and check Hacker News

Thanks for sharing

LeonM• 12 years ago

If you like these kind of posts, you should definitely visit the Hack-A-Day blog every now and then :)

alan_cx• 12 years ago

Add Instructables.com to that.

In fact, I'd respectfully suggest that HN is not even slightly the best place for this sort of thing.

beloch• 12 years ago

The videophile in me really wanted to see some test patterns. It's relatively easy to get some nice, artificially colorful CG shots to look good in screenshots, but comparatively hard to get uniform focus and illumination with color fidelity that will make human faces look natural. Using such a large LCD panel might make focus easier (and the cabinetry bigger), but I bet getting the illumination anywhere close to uniform is a real PITA!

Animats• 12 years ago

LED off-road auto headlamps, brighter than on-road, are good enough and cheap enough now that those are an illumination option. You can get a few thousand lumens now for a hundred dollars or so. Halogens are a pain; they have a short life, cooling problems, and generate IR which turns into heat at the LCD panel, so you need fan airflow across the panel. This guy has been struggling with halogen cooling and power problems. Halogens are on the way out. Even stage lighting is going LED.

Projectors are getting better, cheaper, and brighter with LED lamps behind them. Here's a 1000-lumen 1080p projector: "http://www.lg.com/us/projectors/lg-PF85U-portable-led-projec.... It's still around $1200, but give it six months.

rasz_pl3• 12 years ago

leds dont really produce nice white, its mostly blue led + yellow phosphor producing bumpy spectrum

ChuckMcM5• 12 years ago

As you point out, the color rendering index of the LED is a function of the phosphors. There are now a number of 'white' LEDs which have better CRI than projector bulbs. It really is only a matter of time before projector bulbs are gone.

stinos• 12 years ago

The LCD he got for $200, is that actually the same as what's in the MacBook? That's not really clear from the first paragraph..

FlyingAvatar• 12 years ago

Yup.

http://www.ebay.com/itm/New-15-LCD-Screen-Display-For-Macboo...

rasz_pl3• 12 years ago

yes, but its not optimal, you can get LP129QE1-SPA1 for third of the price

yehat• 12 years ago

The point is what will drive it? There's a driving board for the 15" Mac retina display.

frik• 12 years ago

Make sure to add some fans, the LCD/TFT panel doesn't like the heat of a high-power halogen/xenon lamp! OP uses several fans too, to cool down the air around the xenon lamp: http://forum.allinbox.com/aspectgeek/Projetsencours/18/photo...

A friend converted an overhead projector (and a 1080p LCD panel) into a DIY projector, some years ago. His panel turned brown and broke because of too high air temperature.

As even the OP has cooling issues - lesson learned: Better use LED with 1000+ Lumen instead of a halogen/xenon lamp.

Zeebrommer• 12 years ago

It seems OP uses the arc lamp for its almost-point-source qualities. Halfway down the first page he simulates a led source, it will create a less sharp focal point.

snippyhollow• 12 years ago

Wow that site still exists! :) I did one when I was 17 (I'm 28 now), I first modelised everything in 1) an optics simulator 2) Solidworks, and then assembled it with a wooden case: http://forum.allinbox.com/aspectgeek/Projetsencours/9/projec...

http://www.google.com/cse?cx=partner-pub-5733989050076975%3A...

terrence_giggy• 12 years ago

This brings up some good (and bad) memories from past hobbies. Back in the day when 1080p was the new rage, I remember getting immersed in one of these DIY projector projects. For anyone looking into it - this was the site to get parts from:

http://diyprojectorkits.com/store/

They built a box 100 times better than I would hoped to have. Plus, I believe I got my lenses from there as well.

DIY 2880x1800 projector

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