I got one question maybe someone can answer for me.
Size of the LCD is not important, resolution is. From what I've read so far, if one uses a panel the recommended MINIMUM is 640x480, and because all smalles than 5 inch LCDs with high resolution are really expensive, people end up either getting a 7 inch LCD projection panel (For starters) or dismantling an LCD monitor.
What I'm thinking is this:
You need higher resolutions to be able to project bigger images and still have a good quality right? Example: a pocket TV may look good in its original 2 inch screen, but projecting that on 100 inces would make pixels the size of golf balls (If not tennis balls).
What's my point? Question (I don't know the answer obviously): Wouldn't it be possible to get a decent image using a dismantled pocket TV (Lot cheaper than an LCD monitor), but projecting it in say 30 or 40 inches diagonally? Since the image is not so big, maybe that makes up for the low (320 maybe) resolution?
Size of the LCD is not important, resolution is. From what I've read so far, if one uses a panel the recommended MINIMUM is 640x480, and because all smalles than 5 inch LCDs with high resolution are really expensive, people end up either getting a 7 inch LCD projection panel (For starters) or dismantling an LCD monitor.
What I'm thinking is this:
You need higher resolutions to be able to project bigger images and still have a good quality right? Example: a pocket TV may look good in its original 2 inch screen, but projecting that on 100 inces would make pixels the size of golf balls (If not tennis balls).
What's my point? Question (I don't know the answer obviously): Wouldn't it be possible to get a decent image using a dismantled pocket TV (Lot cheaper than an LCD monitor), but projecting it in say 30 or 40 inches diagonally? Since the image is not so big, maybe that makes up for the low (320 maybe) resolution?
jcbklyny said:
Any idea of approximately what would be the maximum size with a decent image (For watching TV and DVDs) achievable with a Pocket TV LCD?
That would depend on the panel resolution, contrast and your personal preference. Just remember, the smaller the better. You might get away with a 3x5 screen if your lucky and have some room to sit at least 10 feet from the screen. Which isnt very far at all when you see it.
Problem with measurment units
Hmmm, I asume that 3x5 is in feet, right? I'm not used to the american system, but I think thats almost 1x1.5 meters, which would be in the neighborhood of a 36 inch TV? If it is similar to having aa 36 inch TV it would be worth a try as it is possible to get a decent pocket TV for under US$80...
Has anyone done this so far?
Thanks again for your kind help!
jcbklyny said:
Hmmm, I asume that 3x5 is in feet, right? I'm not used to the american system, but I think thats almost 1x1.5 meters, which would be in the neighborhood of a 36 inch TV? If it is similar to having aa 36 inch TV it would be worth a try as it is possible to get a decent pocket TV for under US$80...
Has anyone done this so far?
Thanks again for your kind help!
I was going to try and put a mini tv in my b&w projector but thought it would not be partical...i would say try it but don't put a lot of money in it. you can always sell what you bought.....Bob
rozojc
Before you get all fired up about using a 2" display for your projector check it out very carefully. Most of the ones I've seen are 200 line displays or less so you would still have the big pixel problem. Some of them are 125 line displays so be careful and look before you leep, OK. Try looking at the display with a normal magnifing glass and then deside if thats what you want to project.
later BZ
Before you get all fired up about using a 2" display for your projector check it out very carefully. Most of the ones I've seen are 200 line displays or less so you would still have the big pixel problem. Some of them are 125 line displays so be careful and look before you leep, OK. Try looking at the display with a normal magnifing glass and then deside if thats what you want to project.
later BZ
You'd be much better off getting a low end projection panel. I'd reccomend an NView Spectra. While it's not the greatest panel, and the color depth is kinda low, it sure beats a 2" LCD. I got mine for $45, same as most little LCD screens. Then just plop it on an OHP and you have a very nice looking image. I've projected mine up to 110" and it looks fine.
Portability
Where could I find one of those ? (I didn't find that one on Ebay).
Another thing I have not yet understood so far: if a panel works by just placing it on top of an OHP, is it possible to build a custom housing for it, using very good lights (Halogen or metal halyde) WITHOUT having to dismantle the backlight? (I am thinking that if the light of the OHP can pass through it, it then would be possible to use a panel and build a custom housing for it, as I would like to make a portable unit)
Ehuwiko said:
Where could I find one of those ? (I didn't find that one on Ebay).
Another thing I have not yet understood so far: if a panel works by just placing it on top of an OHP, is it possible to build a custom housing for it, using very good lights (Halogen or metal halyde) WITHOUT having to dismantle the backlight? (I am thinking that if the light of the OHP can pass through it, it then would be possible to use a panel and build a custom housing for it, as I would like to make a portable unit)
Projection panels don't have backlights, they're made for this purpose. No LCD screen can project an image with a backlight on it, the backlight must be removed. Many people have made custom housing for their projector. There's several other NView panels on there right now. The Spectra C is another popular choice. Just keep an eye out and you can get a good deal.
If you do decide to go the small panel route, the best looking small LCDs I've seen are the 5" sony PSOne monitors, although I don't know if they are stripable.
If you do decide to go the small panel route, the best looking small LCDs I've seen are the 5" sony PSOne monitors, although I don't know if they are stripable.
Ehuwiko said:
So, I could get a projection panel and instead of using an OHP (Which would take away my desire of making a portable unit) I could try to build a custom housing and not have to worry about having to stip anything? That would be perfect! Another q:
What type of lense is recommended, could I for example simply use a 100mm convex plano with 400mm focal length and place it in a barrel so I can focus, or should I get a surplas lense for example the one in: http://www.surplusshed.com/pages/item/l1812.html
Thanks!
A triplet lens from an overhead projector would be best. You can get them at www.diylabs.org, or sometimes other people are selling them.
Ehuwiko said:
Besides a triplet lense from an OHP, what other lenses would make an acceptable result? I personally have tried those 100 inch TV plans on the Internet with a plano convex and a meniscus, and got really decent results. Would it be possible to use one of those and have a custom focusing system?
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