Is that enough acronyms?

I'm wondering about using the light engine from a Samsung LED DLP set and using it with a DIY front projection lens assembly.

My main concern is that the engine is not bright enough for scaling to larger screen sizes. I think this could be overcome by using a high gain and/or curved screen.

Any thing else I am not thinking about?

The lens in your LED DLP light engine is designed to project the image onto the back mirror in the RP set which then reflects the image to the screen at the correct focal length and with the appropriate distortation so that the image is undistorted when it appears on the screen.
I can not think of any possible way you could use the same light engine for a FP system.

Well, my idea was to replace that lens assembly with something else. I've seen the lens asssembly inside there, it defnitely would not work as is. For my Samsung set, it did appear that it would be fairly simple to replace the lens assembly with something else more appropriate.

I've got an old LT150z gathering dust... Not the best optics in the world but might be fun to experiment with.

The enclosure would wind up being rather large and oddly shaped. Not a problem for me since I will (eventually) have a dedicated projection room, but I am guessing this would not make for an elegant rear-shelf or ceiling mount.

If you can solve the lens issue I think the amount of light generated by the Leds would not be enough for the distance and screen size that you would want.
I suggest that some googling might help to find what new projector technologies are under development.

LG HS101 DLP projector has 100 Lm output and good for 80" screen in bat cave :)


Samsung ASSY ENGINE P-DLP BP96-01729C cost $909 and can produce ~300 Lumen.
Do I need another electronic parts to connect PC through DVI (HDMI)
to BP96-01729C ?

No need cabinet, mirrors, screen, atsc tuners...
Only LED DLP light engine with DVI/HDMI connector.

That's a good question: what else would be needed along with just the light engine?

When a tech was at my place recently, to fix the "halo" issue on my HLT5687, I watched him take everything apart. The light engine sits in a tray assembly, and was connected to the power supply and an assembly of the various input connectors. It was connected to the input assembly by what appeared to be a DVI connector.

What was intriguing, is that the lens assembly was a modular attachment to the light engine itself, as if you could simply install whatever sort of projection lens was desired.

Not sure what logic is in that assembly of input connectors... or to put it another way, what type of signal the light engine is expecting at its input. Would we be so lucky as that it would accept 1080p?

The light output would certainly be on the low end of things, but in a totally light-controlled environment, with a very high gain, curved screen, I think it would be plenty bright. My 56" screen is practically a torch when I watch the set in the dark.

The 50" models can be found for about a grand right now. Do they all use the same light engine? I am guessing if they do happen to be different it would only be the optical parts that would vary.

Certainly some electronic boards would also be required since the TV recieves its input into one buffer with an interface chip based on the interface and resolution in use and then it uses a video processing chip to scale and make any other changes required into an output buffer which can then be sent to it's light engine and the light engines required refresh rate. And all of these operations are controlled by a microprocessor within the TV and by the user selectable Picture settings.

Yes, you are correct. But if the light unit is accepting 1080p (maybe a big IF, I dunno), and you have only a single device to connect that is outputting 1080p or can find an inexpensive DVI switcher, you could do without that part.

Personally, I was thinking, just buy a used set (maybe one with a damaged screen or shell?) and use everything. Like I mentioned, you can get a new 50" model for about $1k now.

Gerald

late find... but did you ever go anywhere with this?


psron