Mountain_NZ:
Wow, Interesting setup! I too, am slightly confused however. This is my best guess as to your setup(essentialy):
---LED---------------TUBES------------PRISM----(servo etc)----LENS
=========|--------------------|---|||||||||||||||
(red leds)--->>>>>>>>>>>>>>-||||||||||||||
=========|--------------------|---|||||||||||||||
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,|||||||||||||||>>>-|++++++++|
=========|--------------------|---|||||||||||||||>>>-|}}}}}}}}}|>>
(blue leds)-->>>>>>>>>>>>>>-||||||||||||||>>>--| }}}}}}}}| >>
=========|--------------------|---|||||||||||||||>>>-|}}}}}}}}}|>>
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''|||||||||||||||>>>-|++++++++|
=========|--------------------|---|||||||||||||||
(green leds)>>>>>>>>>>>>>>-||||||||||||||
=========|--------------------|---|||||||||||||||
And The red, green, and blue leds are driven off the color circuitry of the TV.
And i Must ask--Are you an engineer? Any more details you feel like adding would be really appreciated (especially by those less skilled than you obviously are.) Sounds like an awesome setup, i think you probably have ALL of our minds going right about now.
Wow, Interesting setup! I too, am slightly confused however. This is my best guess as to your setup(essentialy):
---LED---------------TUBES------------PRISM----(servo etc)----LENS
=========|--------------------|---|||||||||||||||
(red leds)--->>>>>>>>>>>>>>-||||||||||||||
=========|--------------------|---|||||||||||||||
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,|||||||||||||||>>>-|++++++++|
=========|--------------------|---|||||||||||||||>>>-|}}}}}}}}}|>>
(blue leds)-->>>>>>>>>>>>>>-||||||||||||||>>>--| }}}}}}}}| >>
=========|--------------------|---|||||||||||||||>>>-|}}}}}}}}}|>>
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''|||||||||||||||>>>-|++++++++|
=========|--------------------|---|||||||||||||||
(green leds)>>>>>>>>>>>>>>-||||||||||||||
=========|--------------------|---|||||||||||||||
And The red, green, and blue leds are driven off the color circuitry of the TV.
And i Must ask--Are you an engineer? Any more details you feel like adding would be really appreciated (especially by those less skilled than you obviously are.) Sounds like an awesome setup, i think you probably have ALL of our minds going right about now.
Myren:
I saw a post on AVSFORUMS that, correct me if i am wrong, was written by you, concerning using 4 sheets of Plas-tex (polywall) as a screen, mounted vertically. I was planning on using three panels in my setup. My plan is to hang the middle panel securely on the wall (or backer), and apply a thin bead of silcone caulk to the sides. Each remaining panel would then be slid into place, and squeezed tight to the next. With a soft cloth, i would wipe away excess caulk. There are a few things to consider before trying: the color of the caulk should be tested prior to use, to match the panel. I have seen several slight color variations between manufacturers. Then the color should be stable over time, which is why i am thinking silicone. It is used in exposed areas of bathrooms sometimes, and i believe certain ones claim the color will not change. Plus it is flexible and durable.
If you find any better solutions, i would enjoy hearing about them. I should soon be building my screen, so i am looking now.
I saw a post on AVSFORUMS that, correct me if i am wrong, was written by you, concerning using 4 sheets of Plas-tex (polywall) as a screen, mounted vertically. I was planning on using three panels in my setup. My plan is to hang the middle panel securely on the wall (or backer), and apply a thin bead of silcone caulk to the sides. Each remaining panel would then be slid into place, and squeezed tight to the next. With a soft cloth, i would wipe away excess caulk. There are a few things to consider before trying: the color of the caulk should be tested prior to use, to match the panel. I have seen several slight color variations between manufacturers. Then the color should be stable over time, which is why i am thinking silicone. It is used in exposed areas of bathrooms sometimes, and i believe certain ones claim the color will not change. Plus it is flexible and durable.
If you find any better solutions, i would enjoy hearing about them. I should soon be building my screen, so i am looking now.
Mountain-NZ
You can find the Laser projector site by selecting threads last 75 days.
We are all most impressed with the description of your projector. The servo mirror assembly you are using for horizontal scan must be of an advanced design, solving problems previously found to be extremely difficult if not impossible. Your projector using LED units being able to give a clearly visible picture during daylight is also a considerable breakthrough. We would be most interested in further particulars. This site is for DIY people who spend much time and effort gaining knowledge, trying different things, interchange of information and presentation of results good or not so good in a concrete form such as pictures or diagrams so interested people can benifit from each others efforts. I am sure many others would much appreciate some further details of your remarkable breakthrough.
You can find the Laser projector site by selecting threads last 75 days.
We are all most impressed with the description of your projector. The servo mirror assembly you are using for horizontal scan must be of an advanced design, solving problems previously found to be extremely difficult if not impossible. Your projector using LED units being able to give a clearly visible picture during daylight is also a considerable breakthrough. We would be most interested in further particulars. This site is for DIY people who spend much time and effort gaining knowledge, trying different things, interchange of information and presentation of results good or not so good in a concrete form such as pictures or diagrams so interested people can benifit from each others efforts. I am sure many others would much appreciate some further details of your remarkable breakthrough.
Mountain_NZ:
Here are my specific questions:
The light from The leds got to the prisim and is then passed to the servo-mirrors. Are these servos how the image is actually produced, IE you need a red pixel at position 34, 200, so the red light is passed to the horizontal and vertical to produce the red at that spot? Or am i missing something?
If that is the case, how do you keep the refresh rates to something reasonable on the eyes?
And how are the servos controlled? Do they require some extra circutry?
Is convergance a problem? It would seem to me that the best setup would have servos for each inividual color, converged at the prisim.
How is the resolution of the projected image, is it equal to the TV resolution? If so, have you considered using a CRT computer monitor?
Here are my specific questions:
The light from The leds got to the prisim and is then passed to the servo-mirrors. Are these servos how the image is actually produced, IE you need a red pixel at position 34, 200, so the red light is passed to the horizontal and vertical to produce the red at that spot? Or am i missing something?
If that is the case, how do you keep the refresh rates to something reasonable on the eyes?
And how are the servos controlled? Do they require some extra circutry?
Is convergance a problem? It would seem to me that the best setup would have servos for each inividual color, converged at the prisim.
How is the resolution of the projected image, is it equal to the TV resolution? If so, have you considered using a CRT computer monitor?
Mountain_NZ:
And here are my questions:
How did you make the xy scanner unit or did you use expensive galvanometers?
Is the horitonzal frequenzy not to high for the scanner unit?
Tokter
And here are my questions:
How did you make the xy scanner unit or did you use expensive galvanometers?
Is the horitonzal frequenzy not to high for the scanner unit?
Tokter
Mountain boy
Yes we're all very impressed and frankly I'm dying to know what you've done. I understand where all the light is coming from, but not how you got the servos to move at anything like a high enough rate to project an image. I reckon you'd need a horizontal refresh rate of above 15kHz for a decent image. How on earth do you get servo motors to refresh at that rate?
As for the mirrored tubes - what are they for? And surely an optical fibre isn't very thick so quite how you get all that light focused in the end I don't know.
Good plan and it's certainly livened up this forum (you have to admit it's become stale to say the least), but get some pics so we know you're not talking bollocks.
Cheers,
Yes we're all very impressed and frankly I'm dying to know what you've done. I understand where all the light is coming from, but not how you got the servos to move at anything like a high enough rate to project an image. I reckon you'd need a horizontal refresh rate of above 15kHz for a decent image. How on earth do you get servo motors to refresh at that rate?
As for the mirrored tubes - what are they for? And surely an optical fibre isn't very thick so quite how you get all that light focused in the end I don't know.
Good plan and it's certainly livened up this forum (you have to admit it's become stale to say the least), but get some pics so we know you're not talking bollocks.
Cheers,
scanner unit
It seems by what i read in the internet that it's only possible to make the horizontal refresh rate with a rotating polygon mirror. Maybe it's possible to use the one from an old laser printer...
It seems by what i read in the internet that it's only possible to make the horizontal refresh rate with a rotating polygon mirror. Maybe it's possible to use the one from an old laser printer...
ok I must have missed something
so the picture is made by the 3 different colored LEDs then you squeeze it into a fiber optic cable? Im really not familer with this design but if you shine it in a fiber optic cable the output wouldnt go very far. I have some fiber optics I got from a bank that closed and was messin with it I shined a red laser in one end and at the other end it was only visable if you shine it on a surface 1 foot away in complete darkness. This was a very bright laser to i can see it in daylight when i point it at a building 300 feet away.
so the picture is made by the 3 different colored LEDs then you squeeze it into a fiber optic cable? Im really not familer with this design but if you shine it in a fiber optic cable the output wouldnt go very far. I have some fiber optics I got from a bank that closed and was messin with it I shined a red laser in one end and at the other end it was only visable if you shine it on a surface 1 foot away in complete darkness. This was a very bright laser to i can see it in daylight when i point it at a building 300 feet away.
hehe, maybe hes just taunting us with impossible ideas just so we spend a week tripping over our thoughts 🙂
Wow
Well mountain_nz, you certainly have sparked some interest! I would be very interested in seeing your results. I've been thinking about the same mechanism for months now. I was thinking about rotating cube mirror on an Athlon CPU fan. Each surface=scan line, and the fan rotates at 5000 rpm which works out to 20Khz. Another motor running at a slower speed could scan from top to bottom. Adding surfaces to the mirrors could increase maximum scan rate, and circuitry could be designed to sync with whatever signal was sent to it.
*MY* question is- do LEDs modulate fast enough to draw out an image? I was looking at using lasers, but I was researching laser projectors and they were using Acouto-optical modulators- which implies that the laser diode cannot modulate quickly enough. But the article I read was about something constructed in the early eighties, so things might have changed.
Excellent work- can't wait to see pictures.
Well mountain_nz, you certainly have sparked some interest! I would be very interested in seeing your results. I've been thinking about the same mechanism for months now. I was thinking about rotating cube mirror on an Athlon CPU fan. Each surface=scan line, and the fan rotates at 5000 rpm which works out to 20Khz. Another motor running at a slower speed could scan from top to bottom. Adding surfaces to the mirrors could increase maximum scan rate, and circuitry could be designed to sync with whatever signal was sent to it.
*MY* question is- do LEDs modulate fast enough to draw out an image? I was looking at using lasers, but I was researching laser projectors and they were using Acouto-optical modulators- which implies that the laser diode cannot modulate quickly enough. But the article I read was about something constructed in the early eighties, so things might have changed.
Excellent work- can't wait to see pictures.
Here is the "laser projector" thread:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=1149
Started by remp! Very interesting read. I wonder how close that is to mountain_nz's design? This could really shake things up if it works out.
Good luck everyone.
-f4
http://www.diyaudio.com/forums/showthread.php?s=&threadid=1149
Started by remp! Very interesting read. I wonder how close that is to mountain_nz's design? This could really shake things up if it works out.
Good luck everyone.
-f4
refraction
I have a problem with refraction.
It's cause projected image on the screen can't get sharp enough, for example: when I projecting black line to the screen, there was blue and red line following on each side of the black line.
All I know it's because of single lens I use, the lens will bend light spectrum with different angle.
To elliminate this, we should use more than one lens with different refraction index (is this what we call doublet, triplet or multi achromat lens?).
The question is, how to choose correct lenses so the final result is sharp projected image. (maybe it will need some calculation, but can't find the formula).
I would like to know, is this problem also happen in OHP lens?
Undream and Fender4, since your setup use single plano-convex lens, did you have the same problem as I had?
Waiting for help.
I have a problem with refraction.
It's cause projected image on the screen can't get sharp enough, for example: when I projecting black line to the screen, there was blue and red line following on each side of the black line.
All I know it's because of single lens I use, the lens will bend light spectrum with different angle.
To elliminate this, we should use more than one lens with different refraction index (is this what we call doublet, triplet or multi achromat lens?).
The question is, how to choose correct lenses so the final result is sharp projected image. (maybe it will need some calculation, but can't find the formula).
I would like to know, is this problem also happen in OHP lens?
Undream and Fender4, since your setup use single plano-convex lens, did you have the same problem as I had?
Waiting for help.
Hi marklar,
thanx for the info...and myren what kind of a screen were you talking about in avsforum ?
Would like to know more..and if anyone is interested the XBO short arc xenon bulb produces
6500K color temp and a CRI of >95 ...but the down side is lifetime of the bulb is short...
ps: mountain-nz , would like to hear fr u as well
kool idea...hope its worth while
thanx for the info...and myren what kind of a screen were you talking about in avsforum ?
Would like to know more..and if anyone is interested the XBO short arc xenon bulb produces
6500K color temp and a CRI of >95 ...but the down side is lifetime of the bulb is short...
ps: mountain-nz , would like to hear fr u as well
kool idea...hope its worth while
hey,
i'm goin to be taking on this project soon here...
but first some questions...
Whats a fresnel lens?
would the lens out of a projection tv work?
Ive seen some projects with a 5" lcd and a a lot smaller lens.. does that still work if the lcd is bigger than the lens?
Thanks Guys....
-Josh
i'm goin to be taking on this project soon here...
but first some questions...
Whats a fresnel lens?
would the lens out of a projection tv work?
Ive seen some projects with a 5" lcd and a a lot smaller lens.. does that still work if the lcd is bigger than the lens?
Thanks Guys....
-Josh
Hi mountain_nz:
What is the main advantage of using laser projector? You mentioned using a 60'X40' screen but don't you think the light output from the led would be to low to achieve an exceptable image?
and what about resolution? What kind of resolution can you expect from a laser projector? UXGA? QXGA?
i have just purchased a 21" UXGA lcd panel for my lcd based pj...pls tell me that i did not waste $2,700...but if the laser projector can produce a better image quality..then count me in..
would love to hear about it?
my estimated budget was $8,000 ...
😎
What is the main advantage of using laser projector? You mentioned using a 60'X40' screen but don't you think the light output from the led would be to low to achieve an exceptable image?
and what about resolution? What kind of resolution can you expect from a laser projector? UXGA? QXGA?
i have just purchased a 21" UXGA lcd panel for my lcd based pj...pls tell me that i did not waste $2,700...but if the laser projector can produce a better image quality..then count me in..
would love to hear about it?
my estimated budget was $8,000 ...
😎
Florescent Lamps
Does anyone have opinions on Florescent lights? I would like to start on this project, but I'm not sure on which lights I want to use for this project.
Thanks!
Does anyone have opinions on Florescent lights? I would like to start on this project, but I'm not sure on which lights I want to use for this project.
Thanks!
floresent baadd
point source good
try metal halide(mh), murcery vapor(mv), or plain halogen lights
watch out on halogen they get hot and can melt the lcd
point source good
try metal halide(mh), murcery vapor(mv), or plain halogen lights
watch out on halogen they get hot and can melt the lcd
i'm sorry i didnt explain why flo lights are bad
the light from the bulb spreads out from many points and striks the lcd @ many different angles bluring the image
the light from the bulb spreads out from many points and striks the lcd @ many different angles bluring the image
I still reckon a point light source is only use if you're using a fresnel. I think if you use a bigger light source with some kind of polarizer you could be fine.
Commercial LCDs don't come with point light sources do they? And they've got the best image of all - if you could get that quality on the wall you would be happy.
I read recently about some company (forget who) managing to create a thin and flexible LCD which is very cheap to make. It is almost as easy as printing onto paper. Look out for giant cheap LCDs in the future.
But this will be years in the future and just how "cheap" they will be remains to be seen. I wouldn't buy one anyway. I bet people who bought plasma screens for upwards of £17k will be pissed off now they're available less than half of that.
Commercial LCDs don't come with point light sources do they? And they've got the best image of all - if you could get that quality on the wall you would be happy.
I read recently about some company (forget who) managing to create a thin and flexible LCD which is very cheap to make. It is almost as easy as printing onto paper. Look out for giant cheap LCDs in the future.
But this will be years in the future and just how "cheap" they will be remains to be seen. I wouldn't buy one anyway. I bet people who bought plasma screens for upwards of £17k will be pissed off now they're available less than half of that.
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