Hello Everyone,
I plan on building my projector, so I wanted to ask a few questions that I have been wondering about. I am going to use an LCD monitor and build my own enclosure. The enclosure will not have any mirrors, it will just be: reflector-->bulb-->condenser(maybe)-->1st fresnel-->LCD-->2nd fresnel-->triplet lens. Now...I was wondering how to position the lcd itself. I have noticed that when you take apart the monitor, it has the cables connected to the bottom (is this correct?) So, would I position the light behind the LCD, where the backlight used to be? (more than likely yes). And should the LCD be turned upside down or right side up? (should the bottom of the LCD be on the top or should the bottom be at the bottom, as it normally would be in the monitor itself). Also, for those of you who answer, could you tell me what my projected image will be when finally projected? (i.e. reversed, upside down), and offer solutions to get the image projected the correct way. I just want to make sure before I put this thing together, and have to take it back apart.
Thanks,
Spinnaker
I plan on building my projector, so I wanted to ask a few questions that I have been wondering about. I am going to use an LCD monitor and build my own enclosure. The enclosure will not have any mirrors, it will just be: reflector-->bulb-->condenser(maybe)-->1st fresnel-->LCD-->2nd fresnel-->triplet lens. Now...I was wondering how to position the lcd itself. I have noticed that when you take apart the monitor, it has the cables connected to the bottom (is this correct?) So, would I position the light behind the LCD, where the backlight used to be? (more than likely yes). And should the LCD be turned upside down or right side up? (should the bottom of the LCD be on the top or should the bottom be at the bottom, as it normally would be in the monitor itself). Also, for those of you who answer, could you tell me what my projected image will be when finally projected? (i.e. reversed, upside down), and offer solutions to get the image projected the correct way. I just want to make sure before I put this thing together, and have to take it back apart.
Thanks,
Spinnaker
Spinnaker if you are gonna go front projection and not use any mirrors you will have to flip and rotate the lcd .
your cables will most likely be on the top of the lcd when its in the monitor housing you will need to flip the lcd so the cables are on the bottom and project the light thru the front of the lcd to get the correct orientation on the screen
and use a condensor lens it will make the image brighter with out a doubt
i myself am about to make the same encloser with no mirrors if you use a mirror thats not a first surface mirror "wich are so ******* expensive " it will do nothing but degrade the image quality so i just say NO to mirrors
i havent tryed this method yet but i was told you could project thru either side of the lcd i will find out for sure real soon i will have a new construction thread starting soon i have to the opening of football season to complete this projector for a friend
and i will post the whole thing as soon as im done
your cables will most likely be on the top of the lcd when its in the monitor housing you will need to flip the lcd so the cables are on the bottom and project the light thru the front of the lcd to get the correct orientation on the screen
and use a condensor lens it will make the image brighter with out a doubt
i myself am about to make the same encloser with no mirrors if you use a mirror thats not a first surface mirror "wich are so ******* expensive " it will do nothing but degrade the image quality so i just say NO to mirrors
i havent tryed this method yet but i was told you could project thru either side of the lcd i will find out for sure real soon i will have a new construction thread starting soon i have to the opening of football season to complete this projector for a friend
and i will post the whole thing as soon as im done
cruser
i think you used mirror to re-project the light and image
isn't it better to re-project only the light with very thick mirror 2 millimeters?
bye
i think you used mirror to re-project the light and image
isn't it better to re-project only the light with very thick mirror 2 millimeters?
bye
I think it's safer to use LCD's the way they are planned to work, light source where the back light is. That's because of the polarizers and other filters. If you want to flip the LCD to mirror the image then just flips the bare LCD between the polarizing and other films there are ...
Btw. not all FS mirrors are that expensive, see here . Some are odd sizes, they are quite small, but you can use them close to the projection lens (just like in OHP's).
Btw. not all FS mirrors are that expensive, see here . Some are odd sizes, they are quite small, but you can use them close to the projection lens (just like in OHP's).
Mhelin have you used any of these first surface mirrors from the website you put a link to with your beamer? How good is you picture? What size is your first surface mirror?
custom first surface mirrors
This guy makes custom first surface mirrors. They are pretty cheap too. Check it out Does anyone know of any reasons why these mirrors wouldnt serve our purpose?
This guy makes custom first surface mirrors. They are pretty cheap too. Check it out Does anyone know of any reasons why these mirrors wouldnt serve our purpose?
m00p, good link... I havent seen that before. Yes if they are what he says they are it would work out great. I'd like to see more specs on them... and it does still seems a little to ghetto for my taste. I was happy to pay the extra 25 bucks and buy mine from Edmund.
Let me know how they work out if anyone orders one.
Let me know how they work out if anyone orders one.
dracul said:
Yes I use Anchor's FS mirror (the odd sized one). Picture is good, I think you will loose ~ 5% of the light when using a FS mirror. I haven't compared with and without mirror picture quality. Just watched Two Towers last night, I haven't adjusted the color balance properly yet. I'd like to see more green, more vivid colors. Maybe it's possible only with the CRT and DLP projectors. I know there are details in DIY projector designs that could be used to improve contrast and color like painting the box black inside (have anyone done it, and how much has it improved picture?).
Yes, thanks for the link. What size mirror should I get? Would the optimum size be the same size as my lcd monitor?
the thickness of the mirror helps as far as heat is concerned. A thin mirror will heat up and crack over time. So go with 6mm. Should be the same price.
The size mirror depends on how far away from the LCD (or top fresnel if your splitting them) you want it. You can use graph paper to get an exact size.
The size mirror depends on how far away from the LCD (or top fresnel if your splitting them) you want it. You can use graph paper to get an exact size.
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