How LCD Projectors Work (Part 1 of 2)

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This is part 1 of 2 showing how a typical LCD projector works, using a projector from a used up rear projection TV.
You will see how the optical system works in this part, from the special mirrors used to let some color light through, but reflect others, and the lens systems which produces light uniformity, as well as tinted lenses to help true up some colors.
Part 2 will continue with the image assembly, including the projection lenses, the prizm that combines the three colors of the displays, to the output cast on a wall.

Опубликовано:

6 сен 2024

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Комментарии : 57

@FernandoOleapaintings 13 лет назад

Cool. RGB.... There are some human minds behind this creation!

@electricbrooke 12 лет назад

I remember not long after you posted this video, before I subbed, looking up how these works on Google. Found this video. Not long later, I stumble on your elevator videos, and subscribe. Little do I know at that point, that this video was made by that same elevator enthusiast. This is a VERY fascinating video. ;)

@georgef551 14 лет назад

I was running out of time when I did this, so I would up rushing the color tabs, and forgot to do opposites for the color names (to appear in their correct color). I had an LED flashlight, but the incandescent was brighter, so the color is skewed a bit towards yellow, but it does the job. I'm thinking of doing other things with this piece of the TV, but haven't come up with one yet.

@georgef551 15 лет назад

Multi-language response. Cool! Thanks. Hope you enjoyed it.

@sbeer6er 14 лет назад

I wanna see a slow motion of the array of mirrors.

@georgef551 12 лет назад

@miro9963 No problem. I'm not a fan of those basic explainations as well. I found it interesting how the images are put together, saw nothing like it here, so I recoreded a 2-part video, and posted them.

@georgef551 13 лет назад

@COOKISLANDCHURCHGIRL No tripod then, as this RU-vid thing wasn't normal activity then.

@georgef551 14 лет назад

I thought the same thing (the facinating part), when I took it apart to see what was inside, and how it all worked. Good luck with the colored mirrors! :)

@georgef551 12 лет назад

@KeithWasHere1 Oh, no, I don't have any of that stuff. Just the optics. The boards, bulbs, all long gone. This won't be any use to you then.

@209hii 12 лет назад

exactly! i hate dumbed down explinations. i wanted to know how a lazer works, so i found out how to make a p-n junction and got into physics just to know what right materials to use for it. i wanted to know how a capacitor works, and got into electrical engineering to understand how it stores its electricity. i take it to the max

@georgef551 12 лет назад

@KeithWasHere1 I'm not sure. There's an important piece that got misplaced (corrective lens to eliminate severe pincushioning), and some of it's housing is broke. Nothing a little glue couldn't somewhat fix).

@berndp3426 10 лет назад

The light colors (Light-temperature/Hue/Gamma) can be adjusted on some projectors by actually slightly tilting of the splitter mirrors inividually inside a narrow angle so the resulting light behind the mirrors is of a certain wavelength or optical waveband. This is a preadjust setting however, the user-side color hue is corrected by electronics (intensity parameters of the three channels).

@harisudharsan1 14 лет назад

You are not actually using a white light. Since the light source has a sort of yellow tinge, the clolors are not that vibrant.. and regarding the name of the color on the part 2 video, you should have print the name of the colors in the opposite color.. Probably yellow shoudl be printed in blue (I hope so)... Nice video !!

@georgef551 14 лет назад

@olger05 It's broken down so that the Non-Technical (Geek) will understand it.

@georgef551 13 лет назад

@sankar2596 No tripod then, and I'd rather walk around it, versus scratching up my table getting all sides.

@georgef551 12 лет назад

I'm not too sure about that stuff. I was just curious about the optics when I tore this TV apart, and had to share my findings, since I didn't see any videos for this anywhere.

@georgef551 11 лет назад

That horn is heard in several videos. It makes for good conversation, especially those who don't live around here.

@georgef551 14 лет назад

@sxcHideki It was easier to circle around, so as to not accidentaly scratch the table, or drop the loose parts. The would be bad. :) Have a good one!

@georgef551 12 лет назад

It's not a video for short attention spans. It's rewarding to those that are willing to pay attention for more than a couple minutes, no offense. Society has got to stop catering to this problem. That's why things are utter crap nowadays.

@georgef551 14 лет назад

@sutadebastos It's eaither walk around, or scratch the table. I could pick it up, then have the parts fall out. Not much the winning situation. Look at it this way, you can pig out! :)

@pedrovelez2906 11 лет назад

I'm glad that horn was from the fire station and not something else.

@willba4 12 лет назад

hey, i was jut wondeirng with the bulb inside the projector, if that runs off AC or DC? i'm looking at running my projector off an inverter... and if the projector converts the AC to DC inside the projector there isn't any point paying for one of the expensive pure sine wave inverters...

@georgef551 14 лет назад

No idea here. E-Bay?

@georgef551 15 лет назад

It's a small world....Isn't it?

@georgef551 12 лет назад

Funny thing is, there were no videos showing this stuff at all, and I searched to see if it was true.

@egn83b 12 лет назад

Only thing I can say is yea it work but light source has to be over kill to get a picture which sucks.

@georgef551 12 лет назад

Can't help you with that project. :) I find it interesting how those filters work.

@ch3vy2e0 15 лет назад

muy buena explicacion! very good explanation!

@georgef551 14 лет назад

@SCL0PS Glad you enjoyed it.

@kevkev350 12 лет назад

LCD stands for Liquid Crystal Display I think you mean DLP projector which means Digital Light Projector

@georgef551 14 лет назад

@olger05 No problem.

@TheMax19966 9 лет назад

Awesome video! Always wanted to know how it works.

@209hii 12 лет назад

oh and to explain even further, im here because i wanted to know how to make a touchscreen table, then i wanted to make the projector. and after this im probobly gona go find out how those filtered mirrors are made.. lol

@georgef551 12 лет назад

@KeithWasHere1 This thing is fairly useless now, as the one lens that keeps the geometry is currently "in hiding". I'm not sure about selling it yet, as I might do something with it. Not sure yet. I'll have to see if I can find that important lens first.....

@chessguru900 3 года назад

If my projector displays yellowish image what do I need to change? Just the blue polarizer or a mirror too? And if i replace a polarizer how do I adjust it? Good video nevertheless.

@The7thDefence 10 лет назад

What about replacing the normal lamp with a photography studio flash - in order to project an image very bright (for a millisecond or so) ... would the LCD screens be able to deal with so much light - would the image still have the right contrast etc?

@wsandaruwan 12 лет назад

Good Job...., thanks for the awesome tutorial... :D

@Meekimotosyoutubechannel 7 лет назад

my projector has been taken apart five times.. cleaned everything.. i get a ghosty blue line on left edge, and yellow n blue color bleed. im just assuming the lcds are going bad.. viewsonic pj860

@georgef551 12 лет назад

Wow. That reflective property is weird.

@nilimanawale2812 9 лет назад

This is great video.

@georgef551 12 лет назад

Oh, yeah, it takes a crapload of light to get anything good. A full-bright standard flashlight will make a 40" picture, but almost invisible, and ultra-faint white areas.

@georgef551 12 лет назад

No problem.

@CodyL211 15 лет назад

YOU LIVE IN THE CENTER OF LEOMINSTER! i can tell because of the horn! i live there also!

@georgef551 12 лет назад

@KeithWasHere1 If it allows blue, and reflects red and green, this particular projector won't work. :) (Yellow passes through the first lens, reflects blue.)