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Thread: So, give us new LCD touchscreen options!

  1. #31
    MySQL Error Scouse Monkey's Avatar
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    Quote Originally Posted by jtp
    Think people. Just because an LED uses 20ma doesn't mean you add them all up to get the total current. On a 12V system, you can put 3 to 4 of these in series without resistors. And guess what, only 20ma is running through the line. Bright LEDs work between 3 & 4 volts, not 12 or 14V.
    We know bright white LEDs run at 4V thank you!

    and we know how to design an LED array.

  2. #32
    MySQL Error Scouse Monkey's Avatar
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    Quote Originally Posted by jtp
    No monkey:



    In his scenario, it would really only be about .5 - .7 amps in a car.
    ahh i didnt realise you were checking JCs calcs. yeah he is out as he hasnt considered the 12V being split between 3 LEDS reducing the 2A to 2A/3= 0.6-0.7A. So 10W which is about right. But he would need about 200 LEDs so that would be about 1.5A. But thats no porblem at all.

    200 LEDS at 30cents would still be $60!!!! But you could easily dim them or just light some.
    If you used them in conjunction with the existing CCFL (ir is a perimeter one) it could be easy...

    However i think the CCFL route is an easier option it just depends how much light they give out.

    Next post i will go through my calcs (just didnt want a big post)

    EDIT: and don't call me Monkey!!!

  3. #33
    MySQL Error jcdillin's Avatar
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    doh! I knew that didnt sound right

    Well the backlight inverter is going to have to be more powerful in order to drive that bigger tube, so I already have a ccfl inverter that provides dimming support. So I think I am just going to pull the wrap around tube and pull the plexiglass transmitter, so that just leaves the diffuser material.

    but I probably will try it both ways.
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  4. #34
    MySQL Error jcdillin's Avatar
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    Allright well I sent them a e-mail, i'm going to check my digikey catalog when I get home to see what they have.
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  5. #35
    MySQL Error Scouse Monkey's Avatar
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    Quote Originally Posted by jtp
    I've been calling you monkey for the last month.
    ??? where????

  6. #36
    Constant Bitrate
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    I would be interested in going in on the group order if it helps make the lilliput way birghter.

  7. #37
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    Quote Originally Posted by jcdillin
    Allright well I sent them a e-mail, i'm going to check my digikey catalog when I get home to see what they have.
    cool, let me know how it goes.

    these were the LEDs i was thinking off..http://www.luxeonstar.com/

    6 of these bad boys and you would be laughing! but they need cooling!

  8. #38
    MySQL Error jcdillin's Avatar
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    hrm, sounds like a projecter in my car
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  9. #39
    MySQL Error jcdillin's Avatar
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    Quote Originally Posted by Scouse Monkey
    cool, let me know how it goes.

    these were the LEDs i was thinking off..http://www.luxeonstar.com/

    6 of these bad boys and you would be laughing! but they need cooling!

    $42 for each of these buggers

    $252 for a backlight....hrm..


    but they are 120 lumens each


    and having 5w LED's in your car.....priceless
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  10. #40
    MySQL Error jcdillin's Avatar
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    well I might pick up 2 of these they are pretty cheap and will at least give me an idea of how big of a box I have to build behind the lcd and to see if I can get the light even enough
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