But we are talking about collecting the collimated light *after* the LCD..For Instance, my idea:
light--->small fresnel ---> || :
light--->small frsenel ---> || : |)
light--->small frsenel ---> || :
light--->small frsenel ---> || :
where]
|| = LCD
: = one large fresnel
|) = proj. lens
Where the large fresnel collects and focuses to a point the collimated light after the LCD...so no need to "bend the lcd + fresnels to point them towards your (also segmented) PJ lens."?
light--->small fresnel ---> || :
light--->small frsenel ---> || : |)
light--->small frsenel ---> || :
light--->small frsenel ---> || :
where]
|| = LCD
: = one large fresnel
|) = proj. lens
Where the large fresnel collects and focuses to a point the collimated light after the LCD...so no need to "bend the lcd + fresnels to point them towards your (also segmented) PJ lens."?
Ok, some psp 'enhancements' result in this:
Original picture:
With lotsa contrast+brightness:
Imagine what bulbs with 10 degree beams will do....
What I learned here: I'm going to spray the inside of my OHP black as soon as i can. Contrast levels will be much better.
Original picture:
An externally hosted image should be here but it was not working when we last tested it.
With lotsa contrast+brightness:
An externally hosted image should be here but it was not working when we last tested it.
Imagine what bulbs with 10 degree beams will do....
What I learned here: I'm going to spray the inside of my OHP black as soon as i can. Contrast levels will be much better.
Property,
That should work. That way only par. beams hit the 2nd fresnel. But aligning all would be pretty hard.
That should work. That way only par. beams hit the 2nd fresnel. But aligning all would be pretty hard.
rapsac said:
So you can make each of the little fresnels fully adjustable and lockable. That way you only have 20 zones to adjust properly and the screen itself is your test screen...Then lock down all the little fresnels and your all set.
swivels, slides, and gaskets, as cheap as you can get. Hell balsa wood would work great if it weren't for all that heat.
No idea where you got your transmissive numbers, everything I see is close to 50% for a late model tft. 5 to 10 may have been for older panels, but I'm using a samsung ltm150xh, it's got great specs, and I can't believe that it's less than 10%.
Here's a couple quotes that I got from google searches on transmissive percentages.
The LG.Philips technology improves light transmissivity from the backlight up to 85 percent,
in comparison to the 50-percent transmissivity that has been achieved by other approaches.
By adopting this technology for use in TFT-LCD instrument panels for advanced airplanes,
Rockwell Collins can make cockpit instrumentation easier to read with the brighter screen
and a wider viewing angle.
Whereas transmissive devices such as LCDs work by sending light through the liquid crystal layer,
the reflective D-ILA Hologram device bounces the light off a mirror-like layer just underneath
the pixels. Since the light does not have to pass through the pixel-driving transistor layer,
an aperture ratio of more than 93 percent is achieved, compared to only 40~60 percent
with a conventional LCD.
Here's a couple quotes that I got from google searches on transmissive percentages.
The LG.Philips technology improves light transmissivity from the backlight up to 85 percent,
in comparison to the 50-percent transmissivity that has been achieved by other approaches.
By adopting this technology for use in TFT-LCD instrument panels for advanced airplanes,
Rockwell Collins can make cockpit instrumentation easier to read with the brighter screen
and a wider viewing angle.
Whereas transmissive devices such as LCDs work by sending light through the liquid crystal layer,
the reflective D-ILA Hologram device bounces the light off a mirror-like layer just underneath
the pixels. Since the light does not have to pass through the pixel-driving transistor layer,
an aperture ratio of more than 93 percent is achieved, compared to only 40~60 percent
with a conventional LCD.
rapsac said:
What color are you going to spray it?
you seem determined jbell,
i wish u goodluck!
Negative,
Just plain dull (I hope) black 🙂
jbell,
I've picked the 5-10% up from this board, there have been multiple threads about this.
And I've seen that LCD's really suck up light with my own eyes 🙂
(And I'm using a state of the art panel, as you might have picked up from reading prev. posts)
Just plain dull (I hope) black 🙂
jbell,
I've picked the 5-10% up from this board, there have been multiple threads about this.
And I've seen that LCD's really suck up light with my own eyes 🙂
(And I'm using a state of the art panel, as you might have picked up from reading prev. posts)
rapsac said:
kool, please let me/us know when you've done it and how it works.If its successful for you i will spray paint mine too 🙂
Done, sprayed everything including the ballast black.
Result: bright spots that were visible when projecting a black desktop image (with the white status bar at the bottom) are gone 🙂
I've taken a pic and adjusted the contrast/brightness to the same level as b4. I'm not sure I've taken the pic from the same distance from the screen so the gray area width might be different. But still, theres more black visible now.
Result: bright spots that were visible when projecting a black desktop image (with the white status bar at the bottom) are gone 🙂
I've taken a pic and adjusted the contrast/brightness to the same level as b4. I'm not sure I've taken the pic from the same distance from the screen so the gray area width might be different. But still, theres more black visible now.
An externally hosted image should be here but it was not working when we last tested it.
Sweet I found a supplier for Solux bulbs (I think)
I have a vendor's permit
Contact Info:
110 Saunders Road #28-29
Barrie, Ontario
Canada
(P) 888-410-8151
(F) 888-705-1335
If they are cheap enough maybe I can sell these on eBay 🙂
I have a vendor's permit
Contact Info:
110 Saunders Road #28-29
Barrie, Ontario
Canada
(P) 888-410-8151
(F) 888-705-1335
If they are cheap enough maybe I can sell these on eBay 🙂
so do we have a example of what the final light output is? after the LCD sucks up most of the light? Just wondering havent seen any pics yet and Im ready to see results.
sorry guys, work is getting in the way of my life...
I am planning on getting a projector up and running with a single light source. If I don't, I'll never know the difference between a single light source and a parallel array.
After things are focused and running, then I'll change to the solux.
I'm working on it right now....
I'm guessing a week or two and I'll have posted results.
check back then.
If this doesn't work, I'll make desk lamps out of the solux's. They are the most fantastic light I've ever seen.
I am planning on getting a projector up and running with a single light source. If I don't, I'll never know the difference between a single light source and a parallel array.
After things are focused and running, then I'll change to the solux.
I'm working on it right now....
I'm guessing a week or two and I'll have posted results.
check back then.
If this doesn't work, I'll make desk lamps out of the solux's. They are the most fantastic light I've ever seen.
yep, heres the response:
it is interesting that he would instantly bring up a design with multiple light sources.
how should I reply?
how many lux do we need?
it is interesting that he would instantly bring up a design with multiple light sources.
how should I reply?
how many lux do we need?
FC=Footcandle, Lux=Lux, Lumen=Lumen
Since: 1 FC=1 Lumen/square foot, and 1 Lux=1 Lumen/square meter
and;
1 square foot=0.0929 square meters
then;
1 Lux=0.0929 FC, and 1 FC=10.76 Lux
So.. If you are lighting a 15" diagonal screen, you have .75 square feet. If you assume 50% transmissivity (there's arguement about that number, some say it's as low as 10%)
A single solux at 36degree will cover the screen at 2' with 571lumens, so you will get somewhere between 285 and 57 FC.
You then multiply it by .75 sq.ft. and get 213 to 43 ansi lumens.
That's why you need an array.
If you want to use 15" panels you need to ask for a 36degree 20,000cp bulb. That would yield between 430 and 2130 ansi lumens. As you guessed -- that is 10 times brighter than the 50watt bulb they currently produce. That is also why I believe that an array of 20 bulbs is the correct amount of light.
Hope this helps
Since: 1 FC=1 Lumen/square foot, and 1 Lux=1 Lumen/square meter
and;
1 square foot=0.0929 square meters
then;
1 Lux=0.0929 FC, and 1 FC=10.76 Lux
So.. If you are lighting a 15" diagonal screen, you have .75 square feet. If you assume 50% transmissivity (there's arguement about that number, some say it's as low as 10%)
A single solux at 36degree will cover the screen at 2' with 571lumens, so you will get somewhere between 285 and 57 FC.
You then multiply it by .75 sq.ft. and get 213 to 43 ansi lumens.
That's why you need an array.
If you want to use 15" panels you need to ask for a 36degree 20,000cp bulb. That would yield between 430 and 2130 ansi lumens. As you guessed -- that is 10 times brighter than the 50watt bulb they currently produce. That is also why I believe that an array of 20 bulbs is the correct amount of light.
Hope this helps
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