See-through Overhead LCD

**jdusablon** · 02-13-2005, 03:15 AM

Got a hold of an lcd for use with overhead projectors in schools/University. When the fresnil lens is removed, it works great. My plan is to use it like a sun visor. Any one have any experience with these devices?

**egeekial** · 02-13-2005, 03:22 AM

I have no idea what you're talking about... do you have any pictures/links/whatnot?

**Vchat20** · 02-13-2005, 03:28 AM

we had something close to this a while back. my algebra teacher had this for use with the TI graphing calculators.

egeekial, basically its an lcd screen, but its see through rather than opaque.

**egeekial** · 02-13-2005, 03:30 AM

Ohhh... I see. Yeah, a bunch of my teachers have had those TI projector thingies.

**Don 944 LA** · 02-13-2005, 02:11 PM

good for also making a homemade projector maybe...
why pay $2000 for video projector

**Vchat20** · 02-13-2005, 10:14 PM

yeah. that'd be nice. good 80" high def flatscreen

**mushin** · 02-13-2005, 11:53 PM

Originally Posted by Vchat20

egeekial, basically its an lcd screen, but its see through rather than opaque.

All LCD screens are like that

.

I've seen at least one guy on the web who took the LCD from a laptop with a broken backlight and attached it on top of a property-dispo overhead projector, to make a dirt cheap LCD projector. Looked noisy, but definately slick.

**NiN^_^NiN** · 02-14-2005, 12:31 AM

Mushin is right

All LCD screens are made like this.

The white that your seeing is the back part of the LCD to direct the Light evenly through the LCD it also a reflection type material depending on the LCD

People have used these for cheap Home video projectors but the problems with thoese projectors is they are usually 640 x 480 res with 256 Colours

There are better one's but most people don't like the way it looks when projected as most of the old displays had bad refress rates.

I'm not sure how you could use this in the car tho....

**jdusablon** · 02-15-2005, 03:49 PM

I have in mind to use the thing like a sunvisor. I think it would be interesting to be able to flip the unit down and select songs while still being able to see the road. I don't know how safe this would be, but testing for this would obviously be done while stationary. Like an HUD (heads up display) for planes, etc.

My reason for using it? (or trying to...) It is just lying around and works. Also, it runs on 12V dc already. I thought for sure someone would have tried this!

The only problem with this scenario is using it at night, since there is no backlight.

**hotponyshoes** · 02-16-2005, 04:37 PM

what about putting it on top of the dash flat down with the backlight attached into the cars head lights. this should then reflect on the windshield just like a jet fighter?