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Thread: Compact fluorescent backlight

  1. #21
    Maximum Bitrate Fusion-One's Avatar
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    I used a ~70cfm fan. My box was mdf. The fan had a shroud with a 1cmx12cm opening to prevent lightleak. Running on the bench in a simulated dash (cardboard box with the flaps loosely open) it got too hot to touch within 30 minutes, and that freaked me out. Maybe if you use aluminum you'll have better luck.. but the fact that the color temperature degrades very quickly was also a major turn off for me.

    You're a lot better off with CCFls. If you dont want to mess around with bending longer tubes to fit them, there are smaller raw tubes available which are cheap.

    I dunno, good luck in this project. I'm just being a little adamant because I feel like my whole experiment was for nothing if people are just going to keep trying it. I suggest getting high quality bulbs.. I used the cheapest ones I could find, and maybe you'll have less heat problems with better quality bulbs. Noma makes the best ones I knows of.

  2. #22
    FLAC is for flaccid parksgm's Avatar
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    Quote Originally Posted by Fusion-One
    but the fact that the color temperature degrades very quickly was also a major turn off for me.
    Agreed!

    You're a lot better off with CCFls. If you dont want to mess around with bending longer tubes to fit them, there are smaller raw tubes available which are cheap.
    Those are more inexpensive than I thought...hmm.

    I'm just being a little adamant because I feel like my whole experiment was for nothing if people are just going to keep trying it.
    Understood...and thanks for the good wishes.

  3. #23
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    Quote Originally Posted by parksgm
    In any case, the LCD is already apart, the CFLs are already installed, and I've got a test rig worked up...so we'll see!
    I guess we will. You are obviously bound and determined to try this. That's the mark of a good hobbyist. Maybe others have missed something that you haven't or that you may solve. But if you are trying it because it is the cheapest option, well then, maybe you should consider that you are actually exploring a more expensive proposition.

    If you try the CFL option and it doesn't work, you are out that cash and time. Now you have to trade up and use the CCFL option, which you could have done in the first place.

    I don't think anyone's trying to discourage you from trying a solution but presumably you asked the question so you could gain from someone else's experience and when they offered it, you ignored them.
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    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
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  4. #24
    CarFrontEnd Creator iamgnat's Avatar
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    Quote Originally Posted by parksgm
    Right, but that risk is the same no matter what option I try. Also, there is much more risk the first time the LCD comes apart, since that disassembly is usually trial and error. The next, and subsequent, disassemblies are much less risky (or they should be, anyway).
    In your picture your MFG backlight is still attached to the LCD. That is the part that seems to bite most people. Also depending on how you choose to do it (removing the backlight completely, or just removing that foil covering) it could potentially make the screen unusable without a new backlight solution.

    I agree with BugByte. If you are doing this because you want to try to complete what others didn't, then more power to you, good luck, and keep us informed. If you are instead just trying for the cheap approach, odds are you are going to spend more time and money doing it this way rather than an already proven design.

    -dave
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    CarFrontEnd (now it's own sub-forum!!!!)

  5. #25
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    using floresent lighting to backlight an lcd is just not a good solution... even if you do get it to work, it will mean that you'll need 3-4 times the ccfm's of airflow... it's not that it can't be done, but it's like trying to tow your boat with your hyndai.... even if it does kinda work, it'll never be a good solution...

    again, this is coming from experience.(not the hyndai part)... not to say I'm right & your wrong, just trying to share what has been learned.... you'll need a blower & ductwork & it'll pump more heat than a p4.... ccfl's will be bad enough... & will take measures to control heat disapation... floresents will just make a lot more heat for the same amount of light.... & then another huge issue is what about dimming...

    if you don't have the time/money or patience to do it right the first time, how will you ever find the time/money or patience to do it over...

    in the end, belive me this is ment as encouragement & help, not as a personal attack... I would love to see more sucessful backlight upgrades... I'm surprised there aren't more.... I'm working on a few different approaches for backlight upgrades.... you should at least invest whatever little time & money you have with something that has a higher chance of sucess all the more so if there limited.....

  6. #26
    FLAC is for flaccid parksgm's Avatar
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    Quote Originally Posted by turbocad6
    this is coming from experience.(not the hyndai part)
    Good. I hate seeing those Hyundais with a hole cut into the bumper fascia for the tow hitch. ;-)

    Quote Originally Posted by turbocad6
    & then another huge issue is what about dimming...
    Was planning on using the stock CCFL for that...and yes, even though I've removed the rear reflective piece from the LCD light guide, it still works...I have a 4 sided stock CCFL after all. :-)

    Quote Originally Posted by turbocad6
    If you don't have the time/money or patience to do it right the first time, how will you ever find the time/money or patience to do it over...
    ...because most of the advice given on this board is anecdotal, not very rigorously tested, and so it's hard to assume that everything was "done right" to make the rejected ideas work. For that reason, I have to take everything I read here with a grain of salt, and then rethink it for myself to make sure whoever shared the advice thought through what they were doing.

    As an example, a previous poster wrote that his box got "uncomfortably hot" when running 6 CFLs. Only after asking about the specifics of his installation did I find out that the box was constructed of MDF (more insulatory than heat conductive!), and there was only an air exchange cooling sytem. I would expect a box like that to get very hot...but that's not how I would design my box or system, and so his assumptions that the idea is "won't work" are based on his experience with a less than optimal set up.

    belive me this is ment as encouragement & help, not as a personal attack...
    Understood. I never take ANY of this as a personal attack...good lord...if I worried about things people say on this board... Anyway, I'm just after a better backlight on a car computer, after all. There are no lives at stake. This is just an enjoyable pastime for me. If the CFLs don't work out, then I will happily join in the chorus of criticism...but if they do work, perhaps because of something I've added or changed, then we'll all be better off, and you'll see another successful backlight upgrade.

  7. #27
    FLAC is for flaccid parksgm's Avatar
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    Quote Originally Posted by Bugbyte
    That's the mark of a good hobbyist.
    Thanks.

    Quote Originally Posted by Bugbyte
    If you try the CFL option and it doesn't work, you are out that cash and time.
    That's the secret beauty of it...I'm not out any cash at all. I'm using a non-modified, readily returnable light source. If it doesn't work out, I'll get my money back.

    Also, I have a magic time machine that I use to erase my failures and disappointments in life, so that's not really an issue either. ;-)



    presumably you asked the question so you could gain from someone else's experience and when they offered it, you ignored them.
    I did ask the question to gain from others' experience...and to identify problems that I had not. Unfortunately (and as I wrote above), the issues identified by other posters (heat and bulb discoloration) were not adequately addressed by the people who attempted previous solutions. As you mentioned at the first of your post, persistence can lead to new ideas or innovation. It doesn't look like anyone has really addressed the heat issue. I'm gonna do that. We'll see if it works.

    But, thanks for the input.

  8. #28
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    go for it...good luck... hope it works out for you

  9. #29
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    You can use CFLS for backlighting lcds. Most ATM machines with color lcd screens use 4 CFL tubes. I have played with one of the displays, and it was extremely bright, 1500 Nit. They had 2 fans to cool the unit. They had also added a heat reflective film layer between the backlight and screen. You can but the heat reflective film from Roscoe or LEE. Both are made for use with lights for film, tv and theater.

  10. #30
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    hey parksgm, I was wondering how you ever made out with this?

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