DIY Rear Projection TV - Page 6

ace3000_1 · 27th January 2004, 06:01 PM

is that the model?

http://www.lilliput.cn/show.asp?thingsid=30

rmccoll · 27th January 2004, 08:07 PM

yes that is the model

acidworkzfx · 28th January 2004, 02:42 PM

I was just wondering, you said use an opaque shower curtain. would this need to be a clear curtain with the foggy effect or a white opaque shower curtain? I noticed also if I hold a piece of paper up to my projector I get a nice pic (coming through the paper) Is this how a shower curtain would work?
Thanks
Andrew

rmccoll · 28th January 2004, 03:18 PM

It is a clear shower curtain with a foggy effect you can them at wal-mart for 2.50. When first get it iron the wrinkles out of it, don't iron curtain put a piece of cloth over it then iron.

dbc105 · 28th January 2004, 04:41 PM

ace, thanks for the reply. sounds a lot like the layout of the bad RPTV I removed the back from last week to have a look at the screen. it uses a mirror to reflect the image on the screen. the screen has small vertical ridges on the outside and it is smooth on the inside. you can not see through it though. it is made of a plastic also. I guess that these ridges help with the viewing angle. when you look at new RPTV screens, they are smooth on the outside and seem to have a clear cover in front of the screen. we need a tv repair guy in this thread that has worked on one of these new HD RPTV.

rmccoll, can you post more details or drawings of your design? is the picture dark around the edges or is this just with the photo of the screen? what size is your screen?

thanks,
David

rmccoll · 28th January 2004, 05:50 PM

I have broken this projector but here are the details.The TV is 62 inches tall, 36 inches wide and 30 inches in depth. My screen is only 40" which is not really big. The base where the projector is was the first part I build, then I build the screen which is a piece of plexi-glass followed by the opaque shower curtain put into a frame. My mirror is 18X24 it sits at a 45 degree angle, the top of the mirror is 24 in. away from the screen and 30 in. away at the bottom. After I got that build, I messed around with the projector to get the picture to show right.

At a distance the image shows great but as you come closer to it the area around the image does become darker because I didn't have a fresnel lense to focus the light dircetly at you.

My new projector I'm build will be smaller, brighter and have a slightly larger screen(42in.).

dbc105 · 29th January 2004, 10:55 AM

thanks rmccoll. if you can post a few pics of the one you are building now it would be a big help. the projector setup is of big interest seeing how this is RPTV and not projected on a screen. 40" - 42" is not a bad size in a smaller room. my den is about 20' wall to wall but where the recliners are and where the screen would be out from the wall will onl be about 15'. if I projected a big screen on the wall I would get neck cramps turning my head trying to watch it. I am thinking 50" - 55" wide for 4:3 or maybe 60" wide if 16:9. I am saving some project money to work with so for now I am getting educated. guys on this forum such as ace and yourself are a big help! many thanks. when I get started with my project I will post progress here.
David

rmccoll · 29th January 2004, 08:39 PM

Here is my new design. The projector will project the image onto a mirror or a white sheet of paper. If I use a sheet of paper the image will show up on the paper and be magnified by a large plano-convex lense or a fresnel. I believe this setup will project the image into the fresnel or lense straighten it out so it project straight at the screen, this will allow me to make my screen without a fresnel to straighten the image out. I don't know if this idea will work but I will post result when I get to it.

rmccoll · 29th January 2004, 08:41 PM

here is the design

dbc105 · 30th January 2004, 10:47 AM

that is pretty close to what I have in mind but with the projector mounted at an angle right under the screen. I made a drawing of it but how do I insert it into a message? one advantage to your design has is that it allows for a taller screen. will the paper work in place of a mirror?

ace, when I get those seeds I'll send you a few. heck, I'll send everybody a few! LOL!

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27th January 2004, 06:01 PM	#51
ace3000_1 diyAudio Member Join Date: Mar 2003 Location: spain	is that the model? http://www.lilliput.cn/show.asp?thingsid=30

27th January 2004, 08:07 PM	#52
rmccoll diyAudio Member Join Date: Nov 2001 Location: The Carolinas	yes that is the model

28th January 2004, 02:42 PM	#53
acidworkzfx diyAudio Member Join Date: Jan 2004 Location: USA	I was just wondering, you said use an opaque shower curtain. would this need to be a clear curtain with the foggy effect or a white opaque shower curtain? I noticed also if I hold a piece of paper up to my projector I get a nice pic (coming through the paper) Is this how a shower curtain would work? Thanks Andrew

28th January 2004, 03:18 PM	#54
rmccoll diyAudio Member Join Date: Nov 2001 Location: The Carolinas	It is a clear shower curtain with a foggy effect you can them at wal-mart for 2.50. When first get it iron the wrinkles out of it, don't iron curtain put a piece of cloth over it then iron.

28th January 2004, 04:41 PM	#55
dbc105 diyAudio Member Join Date: Jan 2004 Location: Alabama	ace, thanks for the reply. sounds a lot like the layout of the bad RPTV I removed the back from last week to have a look at the screen. it uses a mirror to reflect the image on the screen. the screen has small vertical ridges on the outside and it is smooth on the inside. you can not see through it though. it is made of a plastic also. I guess that these ridges help with the viewing angle. when you look at new RPTV screens, they are smooth on the outside and seem to have a clear cover in front of the screen. we need a tv repair guy in this thread that has worked on one of these new HD RPTV. rmccoll, can you post more details or drawings of your design? is the picture dark around the edges or is this just with the photo of the screen? what size is your screen? thanks, David

28th January 2004, 05:50 PM	#56
rmccoll diyAudio Member Join Date: Nov 2001 Location: The Carolinas	I have broken this projector but here are the details.The TV is 62 inches tall, 36 inches wide and 30 inches in depth. My screen is only 40" which is not really big. The base where the projector is was the first part I build, then I build the screen which is a piece of plexi-glass followed by the opaque shower curtain put into a frame. My mirror is 18X24 it sits at a 45 degree angle, the top of the mirror is 24 in. away from the screen and 30 in. away at the bottom. After I got that build, I messed around with the projector to get the picture to show right. At a distance the image shows great but as you come closer to it the area around the image does become darker because I didn't have a fresnel lense to focus the light dircetly at you. My new projector I'm build will be smaller, brighter and have a slightly larger screen(42in.).

29th January 2004, 10:55 AM	#57
dbc105 diyAudio Member Join Date: Jan 2004 Location: Alabama	thanks rmccoll. if you can post a few pics of the one you are building now it would be a big help. the projector setup is of big interest seeing how this is RPTV and not projected on a screen. 40" - 42" is not a bad size in a smaller room. my den is about 20' wall to wall but where the recliners are and where the screen would be out from the wall will onl be about 15'. if I projected a big screen on the wall I would get neck cramps turning my head trying to watch it. I am thinking 50" - 55" wide for 4:3 or maybe 60" wide if 16:9. I am saving some project money to work with so for now I am getting educated. guys on this forum such as ace and yourself are a big help! many thanks. when I get started with my project I will post progress here. David

29th January 2004, 08:39 PM	#58
rmccoll diyAudio Member Join Date: Nov 2001 Location: The Carolinas	Here is my new design. The projector will project the image onto a mirror or a white sheet of paper. If I use a sheet of paper the image will show up on the paper and be magnified by a large plano-convex lense or a fresnel. I believe this setup will project the image into the fresnel or lense straighten it out so it project straight at the screen, this will allow me to make my screen without a fresnel to straighten the image out. I don't know if this idea will work but I will post result when I get to it.

30th January 2004, 10:47 AM	#60
dbc105 diyAudio Member Join Date: Jan 2004 Location: Alabama	that is pretty close to what I have in mind but with the projector mounted at an angle right under the screen. I made a drawing of it but how do I insert it into a message? one advantage to your design has is that it allows for a taller screen. will the paper work in place of a mirror? ace, when I get those seeds I'll send you a few. heck, I'll send everybody a few! LOL!

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