Ok...I've searched the forum and found absolutely no info on this so I submit it here for comment. It's basically only theory stage right now, if "theory" is the right word for such a simple idea.
How about COMBINING rear and front projection systems? I think, from what i've read, this type of system should overcome many of the problems of each of the systems individually.
Of course screen size wouldn't be that great...from what i've read no more than 60" diagonal if you want the rear projection system to be in a nice compact (6'hX5'wX3'd) box....
But of course this screen size could possibly be increased depending on how much space you have available for the rear projection system.
From preliminary thoughts into this, a few things would be needed:
1 low res (small screen) lcd for rear projector
1 Higher res lcd screen for front projector
1 graphics board with 2 monitor out feeds (or 1 line splitter box with 2 video outs for non-htpc systems)
1 Screen which can balance rear and front projection well.
From what i've read from Tim's (search Tim) and Muzzman's (search Muzzman)
rear projection systems, they got excellent bright and crisp DAY TIME! pictures while using the Fluorex (no heat) bulbs.
Now the concern for me would be the Low res small screen for rear projection. BUT! Imagine juxtaposing your higher res front projecting system onto the lower res rear proj image!
It should yield more VIBRANT colors and BETTER contrast (maybe not...maybe better contrast between colors but not blacks and whites...any insight into that would be appreciated)
This juxtaposition should yield you a nice bright hi-res picture...maybe even eliminate some screen door if done right....There are other preliminary concerns that i can think of:
- Matching the front image to the rear image:
Simply projecting a fine grid and matching up the grid should handle this
- Color matching. Simply put, your rear projected pixel will be larger than any one of the high res front projected pixels which make up that one low res pixel. In Addition, the color of that one low res pixel might be some kind of average of the colors of the group of hi res pixels that make up that one low res pixel:
We may need some kind of program (similar to deScaler?), which adjusts the hi-res pixel colors to account for the color of the low res pixel behind them. From what i know, this would be a small and simple program which just takes pixelmaps and adjusts RGB levels for eah pixel in the frame buffer.
How does it sound?
It should definetly increase screen brightness by 50%-100%! And it seems like it would take the best aspects of both systems and combine them.
How about COMBINING rear and front projection systems? I think, from what i've read, this type of system should overcome many of the problems of each of the systems individually.
Of course screen size wouldn't be that great...from what i've read no more than 60" diagonal if you want the rear projection system to be in a nice compact (6'hX5'wX3'd) box....
But of course this screen size could possibly be increased depending on how much space you have available for the rear projection system.
From preliminary thoughts into this, a few things would be needed:
1 low res (small screen) lcd for rear projector
1 Higher res lcd screen for front projector
1 graphics board with 2 monitor out feeds (or 1 line splitter box with 2 video outs for non-htpc systems)
1 Screen which can balance rear and front projection well.
From what i've read from Tim's (search Tim) and Muzzman's (search Muzzman)
rear projection systems, they got excellent bright and crisp DAY TIME! pictures while using the Fluorex (no heat) bulbs.
Now the concern for me would be the Low res small screen for rear projection. BUT! Imagine juxtaposing your higher res front projecting system onto the lower res rear proj image!
It should yield more VIBRANT colors and BETTER contrast (maybe not...maybe better contrast between colors but not blacks and whites...any insight into that would be appreciated)
This juxtaposition should yield you a nice bright hi-res picture...maybe even eliminate some screen door if done right....There are other preliminary concerns that i can think of:
- Matching the front image to the rear image:
Simply projecting a fine grid and matching up the grid should handle this
- Color matching. Simply put, your rear projected pixel will be larger than any one of the high res front projected pixels which make up that one low res pixel. In Addition, the color of that one low res pixel might be some kind of average of the colors of the group of hi res pixels that make up that one low res pixel:
We may need some kind of program (similar to deScaler?), which adjusts the hi-res pixel colors to account for the color of the low res pixel behind them. From what i know, this would be a small and simple program which just takes pixelmaps and adjusts RGB levels for eah pixel in the frame buffer.
How does it sound?
It should definetly increase screen brightness by 50%-100%! And it seems like it would take the best aspects of both systems and combine them.
I'm having a hard time imaging a room where this would fit. To get the convergence of the two projectors, there would have to be zero keystone. meaning that the front projector would have to be located exactly dead center of the screen. My biggest problem with computer monitors is convergence, and this seems to have convergence problems written all over it.
Also video cards like a matrox dual head, need 'like' resolution monitors for mirror mode. (not to mention getting one monitor in rear and the other in front projection mode)
I really am not qualified to comment on this -- it's an idea outside what I have knowledge of, or even anything I've ever considered.
Keep thinking!! let me know how it goes if you go forward with it.
draw up some pics with light paths and such -- and see if someone on this forum has a "bright" idea on this.
Also video cards like a matrox dual head, need 'like' resolution monitors for mirror mode. (not to mention getting one monitor in rear and the other in front projection mode)
I really am not qualified to comment on this -- it's an idea outside what I have knowledge of, or even anything I've ever considered.
Keep thinking!! let me know how it goes if you go forward with it.
draw up some pics with light paths and such -- and see if someone on this forum has a "bright" idea on this.
hmmmm....
The great thing about DIY Rear Projection systems, from what i've read, is that they are easily keystone adjustable by moving the rear reflecting mirror and/or adjust the source screen...
What about driving 2 monitors with the same feed...any suggestions anyone?
The great thing about DIY Rear Projection systems, from what i've read, is that they are easily keystone adjustable by moving the rear reflecting mirror and/or adjust the source screen...
What about driving 2 monitors with the same feed...any suggestions anyone?
In theory it sounds great But In reality seems like a toneeeee of work and pain to make both of them work togeather, Kinda like the notion recently about using 2 lcd panels atop eachother to get better contrast etc. I tried that And Its preaty much a no go unless you have a Insane amount of light, I mean thousands of wats of MH lighting. But hey more power to you, If I works I wanna see PICS LOLl. L8er
Video Freak
Hmm...but i'm suggesting here using two light sources...one cool fluorex for rear projection (like MuzzMan and Tim) and the usual light source for front projection....Only the video feed would have the same source for the two lcd panels.
Also from what i've read, the rear projection system is the cheaper of the two systems to build. So the cabinet for the rear Projection system would really be the only extra work..woodwork.
Hmm...but i'm suggesting here using two light sources...one cool fluorex for rear projection (like MuzzMan and Tim) and the usual light source for front projection....Only the video feed would have the same source for the two lcd panels.
Also from what i've read, the rear projection system is the cheaper of the two systems to build. So the cabinet for the rear Projection system would really be the only extra work..woodwork.
I posted something like this awhile back
http://www.diyaudio.com/forums/showthread.php?s=&threadid=13251
BTW where are the images of what tim and muzz have for images, I am having a fun time trying to find them.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=13251
BTW where are the images of what tim and muzz have for images, I am having a fun time trying to find them.
I do not believe this setup will work. As they are two seperate panels on two seperate projectors. The main problem is resolution the two panels will never line up. Because one will have finer pixels the other will have larger ones.
I agree you will NEVER get the convergence right. Also, if the response times of the monitors dont line up (which I doubt they would), you will be puking after the first 10 minutes into the movie (exaggeration, but still)
Also think about the screen, rear projection screens are made quite a bit differently than front projection screens, so you would be forced to go with something tacky
It seems like quite a bit of work to overcome problems that could be solved via other means. If you are only planning on a 60" TV, then a 1000w MH would do for daytime viewing.
This seems like a cool project to try, if you can build it with parts you have lying around, but not something I would put money towards.
Also think about the screen, rear projection screens are made quite a bit differently than front projection screens, so you would be forced to go with something tacky
It seems like quite a bit of work to overcome problems that could be solved via other means. If you are only planning on a 60" TV, then a 1000w MH would do for daytime viewing.
This seems like a cool project to try, if you can build it with parts you have lying around, but not something I would put money towards.
- Status
- Not open for further replies.