DIY Video Projector - Page 12

vdi_nenna · 7th October 2001, 03:10 AM

Nice to hear from you guys!

I can't remember if the tiltles looked bad. There was a screen door effect however.

I worked for 8 hours today to finish my projector. I'll be done tomorrow.

)

The best deal I caould find in a hi rez screen was what you suggested- video panel.

I'll post good or bad tomorrow!

Later!

Vince

dwalls32 · 7th October 2001, 03:20 AM

Vince, I know you have said what you were using at first, but you did end up with the Sharp overhead lcd panel guts?

vdi_nenna · 7th October 2001, 03:36 PM

Yes, the guts are a Sharp 8.4" color LCD. The driver board is huge! It's in an "L" shape, like half a frame. I'm going to have to leave the driver board outside the box; later to figure out how to contain it.

So far, I mounted the LCD holder. Next I'm going to make a holder for the aspheric lense.

I'm making this box modular, so I can move components from slot to slot.

Unfortunatley, my ISP is no longer in the website buisness. The web people, homestead.com, are not providing free web space (I'm not paying for it). It end Nov. 1st.
So getting pictures out will be difficult, if they don't let me post.

But, I signed up for Yahoo Geocities, but there is nothing there yet. I can FTP files up to my new site, but it will be a mess.

More later.

Vince

[Edited by vdi_nenna on 10-07-2001 at 09:39 AM]

vdi_nenna · 8th October 2001, 03:37 AM

It didn't work. I couldn't get it to project correctly for some reason. It was dim too. The new setup didn't work out like I'd hoped.

The LEDs seem bright enough when the LCD panel isn't in-line with the optics.

I'm very disappointed right now. But, I'm not going to give up just yet. I'm going to get some more info on optics and see if I can do this w/ calculations, instead of experimenting w/ trial and error.

Sorry.

Vince

dwalls32 · 8th October 2001, 05:10 AM

Was not being bright enough the only problem you had?

tim0 · 8th October 2001, 09:55 AM

Hi,

sorry that it didn't work out Vince.

I'll buy a used projector now in the 500$ price range. That's 640x480. I have a choice between one with 8" TFT and 400W halogen light, and 3" TFT and gas light with 700 hours on it. The latter model has better contrast too, 200:1 vs. 100:1 for the halogen model.

The halogen projector is cheaper and would be easier to convert to LEDs (it's bigger and has a useable power supply).

What do you think? Is the better contrast (b/w) worth paying almost double?

I found some info on LEDs vs. Halogen lights, and how to convert the brightness ratings:

http://www.caves.org.uk/led/

This might explain why the light in your projector was too dim, compared to a halogen light. Somewhere in the text it says that you need approximately the same wattage with LEDs as with normal bulbs. (each LED: 70mW) I don't think that's true however. LEDs seem to be more efficient after all.
Still, reality rears it's ugly head. We might need more LEDs than we want to pay for.

Best,
Timo

vdi_nenna · 8th October 2001, 02:30 PM

The whole projection lense system was off.

Faidzir, do you have any suggestions??

Fiat1 · 8th October 2001, 03:05 PM

Hello I have been reading this thread since some of the first, I have not posted however becuase I could not get it to work before. I have always thought about making my own video projector and when I read this I was very interested. I worked out the cost in Australian $$$ and it would be much to expensive, I rembered that my school had a Sharp Video Projection panel so I enquired and they sold it dirt cheap. It is a top of the range Sharp brand with every feature possible including a remote contol with a mouse that allows you to plug the panel into a computer so you can do wireless video presenations. LED's will not work Vince, I have my projector running with a 250watt halogen globe and I use it in a room that is nearly pitch black and in dark scenes it is still laking brightness, the instruction manuel recomends 575watts but that is for fairl bright room, I just use mine in a room with the cuirtains closed. I am sorry to disapoint you but LED's are just much to weak. If someone can program a PIC controler that can produce an on off signal able to drive an electromagnet, it would need to oprate at the rate a television does, both horizontal and vertical I then have the answer to all our problems, using technology from 1929 with moder technology and we have a high quality video projector able to work with LED's.

Paul

faidzir · 8th October 2001, 03:11 PM

may be u can get some info from this people.??

http://dutch.phys.strath.ac.uk/David_Cairns/about.htm

vdi_nenna · 8th October 2001, 03:29 PM

Fiat1, I don't complete doubt what you're saying. It look pretty grim last night. But, you might want to take a look at Faidzir's link.

I'm doing something wrong, and I don't know what it is. The light is very white and bright. I'm just not applying it properly. This link myght have some good insight.

Switching to halogan is no big problem either. It's just a few more parts. I'd rather not have he heat, but if I have to, I'll use it.

Vince

7th October 2001, 03:36 PM	#113
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	Sharp 8.4" color LCD Yes, the guts are a Sharp 8.4" color LCD. The driver board is huge! It's in an "L" shape, like half a frame. I'm going to have to leave the driver board outside the box; later to figure out how to contain it. So far, I mounted the LCD holder. Next I'm going to make a holder for the aspheric lense. I'm making this box modular, so I can move components from slot to slot. Unfortunatley, my ISP is no longer in the website buisness. The web people, homestead.com, are not providing free web space (I'm not paying for it). It end Nov. 1st. So getting pictures out will be difficult, if they don't let me post. But, I signed up for Yahoo Geocities, but there is nothing there yet. I can FTP files up to my new site, but it will be a mess. More later. Vince [Edited by vdi_nenna on 10-07-2001 at 09:39 AM]

8th October 2001, 03:37 AM	#114
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	Failed! It didn't work. I couldn't get it to project correctly for some reason. It was dim too. The new setup didn't work out like I'd hoped. The LEDs seem bright enough when the LCD panel isn't in-line with the optics. I'm very disappointed right now. But, I'm not going to give up just yet. I'm going to get some more info on optics and see if I can do this w/ calculations, instead of experimenting w/ trial and error. Sorry. Vince

8th October 2001, 03:05 PM	#118
Fiat1 diyAudio Member Join Date: Oct 2001	Led's won't work I am sorry! Hello I have been reading this thread since some of the first, I have not posted however becuase I could not get it to work before. I have always thought about making my own video projector and when I read this I was very interested. I worked out the cost in Australian $$$ and it would be much to expensive, I rembered that my school had a Sharp Video Projection panel so I enquired and they sold it dirt cheap. It is a top of the range Sharp brand with every feature possible including a remote contol with a mouse that allows you to plug the panel into a computer so you can do wireless video presenations. LED's will not work Vince, I have my projector running with a 250watt halogen globe and I use it in a room that is nearly pitch black and in dark scenes it is still laking brightness, the instruction manuel recomends 575watts but that is for fairl bright room, I just use mine in a room with the cuirtains closed. I am sorry to disapoint you but LED's are just much to weak. If someone can program a PIC controler that can produce an on off signal able to drive an electromagnet, it would need to oprate at the rate a television does, both horizontal and vertical I then have the answer to all our problems, using technology from 1929 with moder technology and we have a high quality video projector able to work with LED's. Paul

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7th October 2001, 03:10 AM	#111
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	Nice to hear from you guys! I can't remember if the tiltles looked bad. There was a screen door effect however. I worked for 8 hours today to finish my projector. I'll be done tomorrow. ) The best deal I caould find in a hi rez screen was what you suggested- video panel. I'll post good or bad tomorrow! Later! Vince

7th October 2001, 03:20 AM	#112
dwalls32 diyAudio Member Join Date: Oct 2001	Vince, I know you have said what you were using at first, but you did end up with the Sharp overhead lcd panel guts?

8th October 2001, 05:10 AM	#115
dwalls32 diyAudio Member Join Date: Oct 2001	Was not being bright enough the only problem you had?

8th October 2001, 09:55 AM	#116
tim0 diyAudio Member Join Date: Apr 2001 Location: Germany	Hi, sorry that it didn't work out Vince. I'll buy a used projector now in the 500$ price range. That's 640x480. I have a choice between one with 8" TFT and 400W halogen light, and 3" TFT and gas light with 700 hours on it. The latter model has better contrast too, 200:1 vs. 100:1 for the halogen model. The halogen projector is cheaper and would be easier to convert to LEDs (it's bigger and has a useable power supply). What do you think? Is the better contrast (b/w) worth paying almost double? I found some info on LEDs vs. Halogen lights, and how to convert the brightness ratings: http://www.caves.org.uk/led/ This might explain why the light in your projector was too dim, compared to a halogen light. Somewhere in the text it says that you need approximately the same wattage with LEDs as with normal bulbs. (each LED: 70mW) I don't think that's true however. LEDs seem to be more efficient after all. Still, reality rears it's ugly head. We might need more LEDs than we want to pay for. Best, Timo

8th October 2001, 02:30 PM	#117
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	The whole projection lense system was off. Faidzir, do you have any suggestions??

8th October 2001, 03:11 PM	#119
faidzir diyAudio Member Join Date: Oct 2001	may be u can get some info from this people.?? http://dutch.phys.strath.ac.uk/David_Cairns/about.htm

8th October 2001, 03:29 PM	#120
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	Fiat1, I don't complete doubt what you're saying. It look pretty grim last night. But, you might want to take a look at Faidzir's link. I'm doing something wrong, and I don't know what it is. The light is very white and bright. I'm just not applying it properly. This link myght have some good insight. Switching to halogan is no big problem either. It's just a few more parts. I'd rather not have he heat, but if I have to, I'll use it. Vince

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