So I was browsing for solutions to regulate the brightness in a cost effective manor and came across 500,000mcd and 750,000mcd LEDs. While looking into them I found that they were often referred to by the wattage consumption. I also remembered that while the LWW5SG LEDs are larger, they are also MUCH more power intensive for only a 4x mcd rating increase. This got me thinking that the math that makes perfect sense about brightness over a square meter.
I think the formula was correct or close to.
I ran numbers for both LEDs (the ebay ones and the LWW5SG)
for the display I used 170mm by 120mm to approximate an 8.4 in 4:3 display (these are the only numbers I have, and its a fairly rough guess). That means the surface area is 20400mm^2
I figured 200 2,500 mcd LEDs or 50 10,000 mcd LEDs with a surface area of 3.15mm^2 and 42.16m^2 respectively.
So that means the outputs are 77.2 and 1033.3 mcds respectively, although both numbers are still WAY to low if the 1/10 brightness transmission threw the LCD guideline is correct.
Well that raises the question would these numbers be accurate as to what was used by coucouillu and the results that followed.
Also, the panel I am looking at says its typical draw is 8w, the LED backlight using the LWW5SGs comes to a grand total of 55w, much higher the the stock ccfl system and probably much more heat too. Hopefully I am failing at the math ...again... or there is something that is not taken to account because the goal is for it to be cheap, not set my car on fire hot, and sunlight readable.
If someone wants to pwn me w/ knowledge here, recommend some other LCD panel / backlight / touchscreen combo or individual units, or just general help I would greatly appreciate it.
I'm starting to think that something like
this might be better to do, although more costly and just at the readable point. But I am planning to make the screen removable with like a 3' cable so if it was not viewable then I could just pop it out and use it.
EDIT: corrected units of measure