How LCD Projectors Work (Part 1 of 2)

[miro9963]

thx thats exactly what i wanna know about every peace of electronic , a stupid expanation like this "the light goes thrught the lens and it projects it is" is not enought for me , im from those ppl who like to know every single detail bout something so thx again

[georgef551]

@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.

[kevkev350]

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

[KeithWasHere1]

no they are pass lenses...some will will allow blue but reflect red and green..other will allow green but reflect reg and blue and so on.

[georgef551]

@KeithWasHere1

If it allows blue, and reflects red and green, this particular projector won't work. :)

(Yellow passes through the first lens, reflects blue.)

[KeithWasHere1]

hey what did you do with all those lenses and filters and whatnot? still got them around?

[georgef551]

@KeithWasHere1

Still got the whole unit here.

[KeithWasHere1]

@georgef551 you interested in selling it.? if so how much? 

[georgef551]

@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).

[KeithWasHere1]

@georgef551 thats cool,i just want the lenses and boards and LCD'S..bulbs too if you got them. i mess with LCD and CRT projos alot and am always looking for spare parts...what kind of projo was it?

[georgef551]

@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.

[KeithWasHere1]

@georgef551 not nessiscarily..im doing some R & D on a laser projector and the lenses and dichros would come in real handy...how many are there? and if you were to sell..what kinda price? if you got a model number i can look it up and get more info on it...still got the projection lens?

[georgef551]

@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.....

[KeithWasHere1]

i just got a dell 3100mp off the net the other day for 30 some odd bucks with bulb...plugged it in and the damn DC-DC board fried on me..not more than 2 min out of the box and a big dark cloud of smoke comes out of it....thought i was getting a killer deal...

[georgef551]

@KeithWasHere1

I think it was a "killer" deal, if you get what I mean.

I'd get the police on that guy. :D

[KeithWasHere1]

@KeithWasHere1 eh i think it might of been a few things..like the cord i used i think the ground pin might of been faulty and the juice didnt have anywhere to go or shipping might of knocked the ballast out of whack.. it was a double deal it and a viewsonic pj350 (it and the dell 3100mp and a few other projos are the exact same just rebadged) so two projos with bulbs w/low hours for like 38 with free shipping isnt bad..and the board it burned up only costs like 35 bucks to replace.so no biggie.

[joyofcreate]

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

[georgef551]

@joyofcreate

To an extent. :)

[COOKISLANDCHURCHGIRL]

Video is algud except for you need to practice more with a tripod and framing. Anyways, i found it interesting.

[georgef551]

@COOKISLANDCHURCHGIRL

No tripod then, as this YouTube thing wasn't normal activity then.

[sankar2596]

really bad filiming , getting dizzy alot

[georgef551]

@sankar2596

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

[electrodacus]

First lens is the integrator lens and second is the polariser. The integrator lens helps having a more uniform light projected so the corners are as illuminated as the centre of the image.

Great presentation.

You can watch my modified LED projector video if you want.

[SCL0PS]

Nice break down of the kit.

[georgef551]

@SCL0PS

Glad you enjoyed it.

[sutadebastos]

i got dizzy and threw up watching this clip!

[georgef551]

@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! :)

[sxcHideki]

i like the way you move around in circles to show the thingi, instead of just moving the thingi around, its shows respec for the technology and i like that alot.

take care :3

[georgef551]

@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!

[olger05]

you talk like we are retards and i hate you for it

[georgef551]

@olger05

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

[olger05]

@georgef551 tanks for the responds :)

[georgef551]

@olger05

No problem.

[sbeer6er]

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

[zeradiddle]

Cool! Makes me want to build a simple optical system. Fascinating.

[georgef551]

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! :)

[zeradiddle]

Definitely immensely fascinating. Optical systems are like the coolest thing ever. The colored mirrors (dichroic mirrors/filters)

[zeradiddle]

Sorry, my comment got cut off.

But yes, the dichroic mirrors might be a bit hard to track down, but i have no idea where i could find those tinted aspherical lenses!

[georgef551]

No idea here.

E-Bay?

[harisudharsan1]

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]

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.

[HWGuyEG]

Anyone know where I can buy those individual components?

GlanTaylor cube(I think that's what the RGB composition prism is called), and dichroic filters.

[georgef551]

No clue. Sorry.

[ch3vy2e0]

muy buena explicacion!

very good explanation!

[georgef551]

Multi-language response. Cool!

Thanks. Hope you enjoyed it.

[CodyL211]

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

[georgef551]

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

[saleall]

lol