I'm about to go pick up a dinosaur of a tv I just bought.
It's a sony vpp-400 single LCD projector, in a SU-409 cabinet designed for said projector. It's also got a trinitron vtu-400 video tuner.
One of the big furniture units that folds and closes.
It's front projection, the projector folds out from the front, and the screen protector (kinda like a secretarys desk) rolls up in the front.
The projector points toward the viewer, reflects off a mirror (really great condition FS).... and back onto the CURVED 40" silver screen.
The light isnt dead yet, but it's dying(plenty of room to retrofit a light, the case is huge)... I don't even wanna think about the resolution of the lcd 😉 but it would be incredibly easy to exchange with an updated screen.
It's also got a really nice glass lens, in great shape.
hence my question....
Since the lens is designed to be used to project an image onto a curved screen if I used the projector with a flat surface the edges would be out of focus, correct?
Also, the screen is very fickle when it comes to viewing angle... is it because of the lens, or because of the screen? or a combination of both?
Any input appreciated.
It's a sony vpp-400 single LCD projector, in a SU-409 cabinet designed for said projector. It's also got a trinitron vtu-400 video tuner.
One of the big furniture units that folds and closes.
It's front projection, the projector folds out from the front, and the screen protector (kinda like a secretarys desk) rolls up in the front.
The projector points toward the viewer, reflects off a mirror (really great condition FS).... and back onto the CURVED 40" silver screen.
The light isnt dead yet, but it's dying(plenty of room to retrofit a light, the case is huge)... I don't even wanna think about the resolution of the lcd 😉 but it would be incredibly easy to exchange with an updated screen.
It's also got a really nice glass lens, in great shape.
hence my question....
Since the lens is designed to be used to project an image onto a curved screen if I used the projector with a flat surface the edges would be out of focus, correct?
Also, the screen is very fickle when it comes to viewing angle... is it because of the lens, or because of the screen? or a combination of both?
Any input appreciated.
Also... any sources on large affordable concave screens?
This may be my window into stereoscopic. 🙂
This may be my window into stereoscopic. 🙂
You can use any projection lens to project onto a curved screen.
Curved screens are designed to focus as much of the projected light on screen towards the viewer. (Movie theaters are like this if you look close). Since it's a small screen you dont have much of a viewing area which is why if you sit off center the screen will look darker then a flat screen, but if you sit dead center the image will appear very bright.
You can use a curved screen... but it should be the size of the seating area. If you dont have the room or cant get a screen that size you'd be better off with a flat screen.
The silver color of the screen is also designed to reflect more of the light back towards the viewer. So if it's a low light projector you'd be better off with a flat silver screen.
Movie theater screens have been silver in color since the first theaters went up and is still the best color for overall brightness which is where the phrase 'the silverscreen' came from.
- JCB
www.diybuildergroup.com
Curved screens are designed to focus as much of the projected light on screen towards the viewer. (Movie theaters are like this if you look close). Since it's a small screen you dont have much of a viewing area which is why if you sit off center the screen will look darker then a flat screen, but if you sit dead center the image will appear very bright.
You can use a curved screen... but it should be the size of the seating area. If you dont have the room or cant get a screen that size you'd be better off with a flat screen.
The silver color of the screen is also designed to reflect more of the light back towards the viewer. So if it's a low light projector you'd be better off with a flat silver screen.
Movie theater screens have been silver in color since the first theaters went up and is still the best color for overall brightness which is where the phrase 'the silverscreen' came from.
- JCB
www.diybuildergroup.com
Posable,
It's possible that you may be able to hot rod this TV by getting a modern small LCD of higher resolution and modding the light engine with a brite DIY bulb. The curved screen actually was to enhance the projected image and should work fine with any new LCD. The lens may be of very good quality and should work in conjunction with the curved screen. But you could drive the LCD with your computer if you wanted to for higher resolution.
Hezz
It's possible that you may be able to hot rod this TV by getting a modern small LCD of higher resolution and modding the light engine with a brite DIY bulb. The curved screen actually was to enhance the projected image and should work fine with any new LCD. The lens may be of very good quality and should work in conjunction with the curved screen. But you could drive the LCD with your computer if you wanted to for higher resolution.
Hezz
This thing is a monstrosity.
I didnt feel like packing everything up the stairs, so I stripped all the goodies out of the cabinet.
The projector is as big as a microwave.
I havent popped it open yet, but I took the lens off, and I can see what appears to be an old *** lcd behind there.
THere are no other inputs on the back of the projector except a controller cord that goes to the reciever.
So, you can't use the projector without the reciever. And it only has coax, and uhf in. 🙂
I hooked some rabbit ears up to it and actually got a decent picture.
Don't think I'll be able to use it for anything, but I did salvage a few decent items that may get put to use or sold.
- A hard plastic 40" silver screen with no blemishes.
- Page size first surface mirror, immaculate
- 1:2.3, 225 mm sony lens, immaculate
I gotta say, at least it was stored well.
Anybody need any of these? 🙂
I didnt feel like packing everything up the stairs, so I stripped all the goodies out of the cabinet.
The projector is as big as a microwave.
I havent popped it open yet, but I took the lens off, and I can see what appears to be an old *** lcd behind there.
THere are no other inputs on the back of the projector except a controller cord that goes to the reciever.
So, you can't use the projector without the reciever. And it only has coax, and uhf in. 🙂
I hooked some rabbit ears up to it and actually got a decent picture.
Don't think I'll be able to use it for anything, but I did salvage a few decent items that may get put to use or sold.
- A hard plastic 40" silver screen with no blemishes.
- Page size first surface mirror, immaculate
- 1:2.3, 225 mm sony lens, immaculate
I gotta say, at least it was stored well.
Anybody need any of these? 🙂
Attachments
Hezz.
Yeah, it would be really easy from what I can see to fit a new lcd in there. Pleanty of room for a new light and room to spare.
Still only 40" though... I was thinking about maybe making a game console out of it. Mount my xbox in there... new lcd... could be pretty cool.
Just don't really have any room for it/ :shrug:
This screen is really pretty impressive. I wish I had one about 7 foot diag.
Yeah, it would be really easy from what I can see to fit a new lcd in there. Pleanty of room for a new light and room to spare.
Still only 40" though... I was thinking about maybe making a game console out of it. Mount my xbox in there... new lcd... could be pretty cool.
Just don't really have any room for it/ :shrug:
This screen is really pretty impressive. I wish I had one about 7 foot diag.
Attachments
Posable,
That's definately a CRT projector. The curved screen was either to increase brightness or to make the lens more simple to built. It looks like a good box to build a LCD projector in. It would be bright enough to place back and have a much bigger picture. You could make a curved larger screen if it requires one. A curved screen can relax design requirements on the lens. But it may have been because the thing was so dim they needed a curved screen to increase brightness at a centered seating position.
It might make a good LCD system. It looks to have something like a nine or ten inch screen from the pictures. If you can make a way for the lens to move you can focus it for different distances from the screen. Maybe it already has enough movement?
Hezz
That's definately a CRT projector. The curved screen was either to increase brightness or to make the lens more simple to built. It looks like a good box to build a LCD projector in. It would be bright enough to place back and have a much bigger picture. You could make a curved larger screen if it requires one. A curved screen can relax design requirements on the lens. But it may have been because the thing was so dim they needed a curved screen to increase brightness at a centered seating position.
It might make a good LCD system. It looks to have something like a nine or ten inch screen from the pictures. If you can make a way for the lens to move you can focus it for different distances from the screen. Maybe it already has enough movement?
Hezz
THanks for the input Hezz.
Is this considered a CRT projector as well? I thought the CRT's had the three exposed tubes. r,g,b
this only has one tube right? It doesnt look like any other crt I have seen anyway... never seen one open though...
Shed some light for me.
The lens only has about 1 1/2" of thread on the barrel.
So it's got about that much room to move in the threaded assembly attached to the front of the screen.
Definately not enough play for long throw.
As far as building an lcd projector from the box...
it definately has enough room. 🙂
I think my OHP is less of an eyesore though.
I can already hear my friends coming over and asking why I have the microwave in the livingroom. 😉
Is this considered a CRT projector as well? I thought the CRT's had the three exposed tubes. r,g,b
this only has one tube right? It doesnt look like any other crt I have seen anyway... never seen one open though...
Shed some light for me.
The lens only has about 1 1/2" of thread on the barrel.
So it's got about that much room to move in the threaded assembly attached to the front of the screen.
Definately not enough play for long throw.
As far as building an lcd projector from the box...
it definately has enough room. 🙂
I think my OHP is less of an eyesore though.
I can already hear my friends coming over and asking why I have the microwave in the livingroom. 😉
Posable,
what you have is an early CRT projector which is essentially a small colored television with a lens. Later on they started making CRT projectors with three lenses and three CRT (cathod ray tubes) because they could get the picture brighter and more color saturated.
What I would do is darken the room to completely dark and then move the projector back and see how big you can get the image to focus at. This will give you a rough idea of how large a picture you can create with an LCD mounted in there using only the existing lens mounting system. You may be able to fabricate an adapter to move the lens out a little which will still allow the lens to focus and create a bigger picture. I would scrap everything except the lens and the housing. You will need the room to build the light engine in there. You shoud be able to mount a LCD right were the CRT glass is or a little back. You might be able to mount a LCD back about an inch and with the lens focusing mechanism it will focus a bigger picture. You can experiment with black and white or color tranceperancies created on a ink jet printer and mounted on a cheap piece of clear plastic.
Then yo can figure out if you can use the housing before investing in a LCD. You will also notice that the glass area of the CRT is curved. That may also be the reason for the curved screen. To correct for the fact the the image plan is not flat. I think it is a good cabinet to build a LCD projector in.
Hezz
what you have is an early CRT projector which is essentially a small colored television with a lens. Later on they started making CRT projectors with three lenses and three CRT (cathod ray tubes) because they could get the picture brighter and more color saturated.
What I would do is darken the room to completely dark and then move the projector back and see how big you can get the image to focus at. This will give you a rough idea of how large a picture you can create with an LCD mounted in there using only the existing lens mounting system. You may be able to fabricate an adapter to move the lens out a little which will still allow the lens to focus and create a bigger picture. I would scrap everything except the lens and the housing. You will need the room to build the light engine in there. You shoud be able to mount a LCD right were the CRT glass is or a little back. You might be able to mount a LCD back about an inch and with the lens focusing mechanism it will focus a bigger picture. You can experiment with black and white or color tranceperancies created on a ink jet printer and mounted on a cheap piece of clear plastic.
Then yo can figure out if you can use the housing before investing in a LCD. You will also notice that the glass area of the CRT is curved. That may also be the reason for the curved screen. To correct for the fact the the image plan is not flat. I think it is a good cabinet to build a LCD projector in.
Hezz
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