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Thread: Compact fluorescent backlight

  1. #31
    FLAC is for flaccid parksgm's Avatar
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    Quote Originally Posted by turbocad6 View Post
    hey parksgm, I was wondering how you ever made out with this?
    So I had the tubes up and running behind the LCD...was illuminating it well fairly well, although I didn't have the chance to do very extensive sunlight testing because...

    ...a stray piece of backlight "foil" (the reflective surface) somehow touched a circuit board that is between the main controller board and the actual screen (essentially in the middle of two flexible flat cables) and shorted the screen out. Fortunately, I was able to obtain a replacement panel from Armen at digitalwww for $55 (which was a great deal), installed it, and the panel worked again...temporarily.

    After more throughly researching the feasiblity of LED backlighting, I decided I was going to pursue that route instead (don't let it go to your head ;-) Lumileds (they make the Luxeons, as I'm sure you know) has some pretty extensive documentation on their site about thermal design of heat sinks for using multiple Luxeons...including formulas that you can use to calculate the total amount of heat sink that you'll need to keep the various Luxeon emitters within their spec operating temps using info from the Luxeon data sheets. As a matter of fact, those data sheets would be great reading for anyone looking to design a heatsink in a backlighting upgrade situation. Maybe I'll post a link to 'em somewhere.

    Anyway, the availability of that data ended up being the deciding factor...I could either go with the fluorescents and guesstimate on the heat production from trial and error, or go with the LEDs and have much more firm data with which to shape an enclosure, etc.

    The screen, meanwhile, suffered another failure, but I have NO idea why this time. Possibly a loose connection, but I was so mad at it that I lost interest in fixing it and moved on to other tasks for the moment.

    So, currently I'm sort of in a holding pattern. My original PC processor, motherboard, and hard drive was fried by the M2-ATX (and I _really_ don't think it was my fault after reading the multiple stories of identical failures that keep cropping up around here), and I am really reconsidering reinstalling a PC based system. The Mac Mini is looking REALLY attractive right now...it can now run Mac OS X and Windows XP simultaneously, has that fantastic form factor, can be purchased with a nice, fat three year warranty, and will fit wherever (almost) I want to put it. Oh, and it will also run StreetDeck (which looks to be pretty nice).

    Now all I need is cash. ;-)

    In the meantime, I've managed to rewire my car (properly) build and install an amp rack and 2 12" subs and box, moved the air conditioning controls from their stock location, and am 50% finished fabbing replacement trim for the center stack.

    How's that for an update?

  2. #32
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    nice update


    cool.... one of the biggest benifits of the led's is there is an actual surface that you have to extract the heat from, as opposed to cfl's or ccfl's, which heat the air in the box.... much harder to extract the heat & you'll need airflow, which you don't need by using the led's, the box can stay sealed, which is a good thing in a dashboard...

    good luck with it bro'

  3. #33
    FLAC is for flaccid parksgm's Avatar
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    Quote Originally Posted by turbocad6 View Post
    nice update


    cool.... one of the biggest benifits of the led's is there is an actual surface that you have to extract the heat from
    Yeah, I realized how difficult it would have been to have designed/machined/fabbed something that would come into contact with the curved glass surfaces of those bulbs, which is the only way to really get good heat extraction, as you said.

    good luck with it bro'
    Thanks! It'll get done...just need more time. ;-) Glad you asked though...made me type that update and update the 'ole worklog with some pics.

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