Quote:
have you seen that?
No I had not, and it seems that I should be worried about heat and not bright enough.
Coucouillu, in the pictures of your backlight upgrade, are those 2 10,000mcd LEDs with a screen in front of them? Did you end up using an LED system? What have you tried and what were the results?
The Osram LWW5SG LEDs are about 3.87 times larger, 4 times brighter, and about 20x more expensive each (thats if I have to pay $4 each, digikey has em for over 6 but they are expensive, maybe I could find them cheaper but I highly doubt I could find them for $0.80 which would be the point where the build cost would be identical to get the same light intensity and about the same length). I do love the idea of such a ridiculously bright LED and actually when did my original research the only reason that I did not emphasize the possibility of using those or similar was the cost.
If I use 170mm as a guess estimate for the panel width, 1.6mm as the width of the 2,500mcd LEDs, and 6.2mm (thats me hoping the unlabeled measurements on the data sheet are mm) for the 10,000mcd LEDs then:
I can fit 27 10,000mcd LEDs along the top or bottom of the LCD for a total of 54. That brings the total brightness (incorrect math of just adding the values) to 540,000mcds. If the LEDs cost $4 a pop then thats $216 + shipping
I can also fit 106 2,500mcd LEDs along the top or bottom of the LCD for a total of 212. That brings the total brightness (incorrect math of just adding the values) to 530,000mcds. From ebay thats $43 + shipping.
If I guessed the data sheets unlabeled units of measure wrong then the LEDs might be smaller which could make things more expensive but brighter, if they are larger then its cheaper but dimmer. Either way I am not wanting to spend $200 when I could spend $50 and get the same result.
Also, the more I think about the heat problem the more it seems for my application the ladder type assembly thing could be better, I might be able to find a way to attach the assembly to the enclosure of the panel to allow better cooling just by direct heat transfer, plus I plan on posting a step by step when I do this in a few weeks and that makes it more realistic to follow because I imagine that not everyone here wants to play with etch solution. I am still amazed that heat is really a problem, one of the selling points of LEDs is that they are cool, my laptop backlight (which is LED not CCFL) dose not get warm at all, but then again I do not have it on full that often.