When using mulitple sources of pinpoint light ( as in LED ARRAYS) how do you keep from seeing an image of each of the LED's?
The field triplet is in front of the LCD and will focus a clear image of each pixel on the screen. The LED's are also in about the same location as the LCD so you will end up with a clear image of the LED's as well.
How to solve the problem?
Kirk
Full Version: Led Colmination
QUOTE (stickgrip @ Jan 15 2007, 05:00 PM) 
When using mulitple sources of pinpoint light ( as in LED ARRAYS) how do you keep from seeing an image of each of the LED's?
The field triplet is in front of the LCD and will focus a clear image of each pixel on the screen. The LED's are also in about the same location as the LCD so you will end up with a clear image of the LED's as well.
How to solve the problem?
Kirk
The field triplet is in front of the LCD and will focus a clear image of each pixel on the screen. The LED's are also in about the same location as the LCD so you will end up with a clear image of the LED's as well.
How to solve the problem?
Kirk
Placing the LED array further away from the LCD screen puts them out of focus and the light will blend together. The more distance, the more even (and dim) the light.
What about using some of the diffusing screens that we normally throw away when stripping an LCD?
QUOTE (stealthsurfer @ Jan 16 2007, 08:41 AM)
What about using some of the diffusing screens that we normally throw away when stripping an LCD?
The problem with a diffuser of any kind is that they scatter light in all directions. This causes much of the light you want projected to miss the projection triplet entirely and you loose brightness in a big way.
Moving your LED array back from the panel will reduce the total projected light a bit, but adding a diffuser will reduce the total projected light a lot more.
QUOTE (IronGecko @ Jan 16 2007, 01:15 AM)
Placing the LED array further away from the LCD screen puts them out of focus and the light will blend together. The more distance, the more even (and dim) the light.
Ok I'll give that a try and measure the light reduction.
I worked out I need about 200 watts of LED's to get the same light strike as a 400 watt MH. If I drop down to 25 LEDs/in^2 ( 165watts) I should still be about right due to the improved color content of RGB's. Thats still a lot of led's (2700) and a lot of heat but...all in the name of science.
I'm going to get 1 inch working well before I either abort or bother with those huge arrays I've seen people working on. I've also noticed that as the led approaches the corner of the screen it needs a different angle to stay bright. might need a bit of a curved mounting panel. probably due to front fres/triplet alignment.
Kirk
Another thing to try would be to use smaller LED's. If you get smallers LED's, the individual LED's will become harder to notice. This would probably require re-making whatever apparatus you have for mounting/powering your LED's, though, if you wanted to keep the same wattage.
yes, you can find 3mm leds, but lower light...so no improvement. There are also smd leds, but things start being complicated...
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