Making a projector from DLP TV

[@beforebefore]

That mirror with the electric actuator is pixel-shifting. It shifts the entire image by 1 pixel width to double the native DLP resolution... that model only has 960x1080 resolution, so when its shifted 1 pixel Left/Right, you have 1920x1080. Each frame of video is split into 2 fields, which the projector displays in sequence. This was common in the early generation of DLP TV's before they had full HD DLP chips.

[@pierogiengineering]

Oh wow, kinda hard for me to understand how moving the screen a little bit improves its quality, even with the two fields, but a cool solution either way. Thanks for explaining.

[@beforebefore]

@@pierogiengineering The original picture is divided into 2 half-resolution images, side-by-side. Then they're projected just the same way... one at a time in sequence, very fast so your eyes blend them into a single 1920x1080 image. This is actually how ALL current 4k home theater projectors work, but they actually shift a 1080p image 1/2 pixel in 4 different positions... right 1/2 pixel ; then down&right 1/2 pixel; then back left, then back up. 4 times 1920x1080 is 3840x2160.... 4k image, but with 1920x1080 DLP chips. In reality it's not "true" 3840x2160 because every pixel is overlapped by 1/2 a pixel in every direction... so you can not actually display all pixels independently... but will the mfrs tell you that? Not on your life. The only TRUE 4k projectors are well over $5k, and I believe there are only 3 that are marketed as home theater.

[@pierogiengineering]

@@beforebefore damn, that’s actually really interesting. I kinda get it now. They make use of your eyes’ weaknesses to have them perceive a higher resolution, smart bastards. Thanks for explaining

[@innacrisis6991]

@@beforebefore wow, you have an incredible depth of knowledge about this. Thanks for the explanation!

[@glashoppah]

Persistence of vision is a strength, rather than a weakness, of your vision.

[@glashoppah]

The coolest thing about those huge projectors is that gigantic Fresnel lens. You can focus a whole lot of sunlight with that thing.

[@Hawk7886]

Hell yeah, you can melt rock with those things

[@KopyKat81]

Young Frankenstein of Electronics. A compliment btw. :)

[@pierogiengineering]

I like that👌

[@irishguy200007]

Nice bathroom mirror.

[@inhisnameislay3401]

Very cool brother I feel your pain. I'm at the stage where I just removed the front lens (reminds me of a lighthouse lens) and have played around with a few of the many lenses I have to try and shrink the projection. Thanks for the video. Should at least help speed along my personal trial and error that is soon to come. You learn anything further? Ideas? I was thinking about a hanging monitor using the Giant (70 inches I think) fresnel lens hanging in 3d space that can be turned . It could be cool having a giant monitor with our that big bulky body of that television (which I already threw away. Thank you for the awesome work.

[@jakobmmn6075]

fckn love this channel. My type of humor, full of nonsense but too entertaining. Keep it up1

[@imsiege]

this is sick you're very talented man

[@pierogiengineering]

Thanks man!

[@Scyth3934]

Holy crap where did you even find that TV

[@glashoppah]

Hahah love the mirror turned into an audio transducer.

[@reecebeck971]

If you were wondering how the dmd mirrors work watch this video by applied science, he explains it well. As for the electromagnet on the back, my guess is for moving the electromagnet around for adjustment.

[@pierogiengineering]

I’ll check it out, thanks

[@TicToc7734]

I was wondering how long it would take you to realize you just needed to move it closer to the wall.

[@marcel1372]

so many free mirrors

[@irishguy200007]

As long as it doesn't open a porthole into the future.

[@tjmbv8680]

Hay what model is this tv? I want to get one to piss my parents off, they already hate my 46” Sony.

[@pierogiengineering]

I got no idea, but they do have a 85" version from the same line

[@tjmbv8680]

@@pierogiengineering XD guess it’s time for me to start researching.

[@loudnoises8197]

mitsubishi

[@iansinnovations1393]

That TV is as big as Bill

[@pierogiengineering]

HA! Absolutely, I still think Bill would manage to eat it.

[@haroldvalin7110]

I'm really glad to see you're still in engineering. Keep taking things apart and building

[@pierogiengineering]

A passion is a passion

[@haroldvalin7110]

@@pierogiengineering which is very good. Just make sure you stay safe

[@lightingkid2010]

crt tvs dont use projectors, they use a gas filled tube with an electron gun.

[@kriswingert1662]

Tube is a vacuum, to start. NO gas in it. The mask is phosphor coated for the color to the aperture grill. 32kv applied and magnetically controlled to control the scan rate and position. You got tube and electron gun correct, that's it.

[@lightingkid2010]

@@kriswingert1662 oh i thought there was argon or something in it, some color crts might have mercury.

[@djonez85]

There are CRT projectors and instead of digital micro-mirrors they use small CRT-screens to produce the image.

[@lightingkid2010]

@@djonez85 i know

[@ChrisWilson-rf8cs]

3:17 LMAO