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Thread: LCD Backlight Upgrade

  1. #431
    Variable Bitrate RS3RS's Avatar
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    Just wanted to say, this is turning out awesome! I might just have to get one of these things if you start selling them. Good luck to the both of you!

  2. #432
    MySQL Error Scouse Monkey's Avatar
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    Quote Originally Posted by Kaitain
    Clearly these guys know about a 1000x more than I do on this topic but I still wonder why they went with CCFL instead of LEDs. The LEDs don't have heat issues, they are super cheap, and they have very low power requirements. I upgraded a simple 20x2 text LCD display using LEDs and it was a breeze. I didn't have any brightness control though...

    I think I'll put my money where my mouth is and do an LED upgrade myself. My idea is to retain the existing CCFL and only use the LEDs as a "boost" mode that will be manual enabled. This is clearly an inferior design to the fully automated CCFL upgrade that would allow variable brightness but this design would be significantly cheaper and much simpler.

    I'm saying all this without even having an LCD screen yet so you can take this wonderful pie in the sky idea with a grain of salt. Mmmmmm, salted sky pie...<drool>.
    we looked at LEDs and dismissed them in a single afternoon. reasons as stated earlier somewhere:

    1. You need about 100 ultra bright LEDs for a 7" screen (or equivalent see Luxeon stuff)

    2. LEDs need depth. the CCFL inside the screens is only 2.6mm in diameter. You will not get an LED that shallow so wouldhave to go edge lit.

    3. Going edge lit you have to mount all the LEDs around the edge and then have a nice interface with an acrylic light pipe

    4. mounting 100 LEDs around the edge is hard - you canot do it around the bottom as the LCD ribbon is in the way along the whole edge.

    5. Wiring together 100 LEDs is a pain in the *ss!

    6. Dimming the LEDs can easily be done using a PWM circuit

    7. you can get 3W Luxeon stars that are as bright as 60 ultra brights but they need a CPU style heatsink for each one and they run at about 70deg C

    8. LEDs used directly behind will give bright spots on the LCD

    9. You can get the required depth using a lilliput screens but not xenarc as they have a side ribbon to the panel.

    Personally i would love to use LEDs but there are too many complications. I know how to fix lots but i can't tell you due to the IP restrictions of my Uni.

    EDIT: i actually came to the same conclusions in one day as my uni did after a 6 months but i dont want to stitch them up and release stuff on the internet

  3. #433
    MySQL Error jcdillin's Avatar
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    Quote Originally Posted by RS3RS
    Just wanted to say, this is turning out awesome! I might just have to get one of these things if you start selling them. Good luck to the both of you!
    Thanks!
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  4. #434
    The Curator
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    O...where is dragonBTV at...I would say that he seams to like to teeze us....posting pics and then disapears into the morning...LOL
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  5. #435
    Constant Bitrate
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    Didn't you watch the news? " A man was fried this morning while playing with a screen "

  6. #436
    The Curator
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    Quote Originally Posted by cederron
    Didn't you watch the news? " A man was fried this morning while playing with a screen "
    RideRunner...The #1 FE, PERIOD.

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  7. #437
    Maximum Bitrate gork's Avatar
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    I believe DragonBTV is overseas. He's probably asleep.
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  8. #438
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    Could be...he has no profile...where in the world is...DragonBTV....
    RideRunner...The #1 FE, PERIOD.

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  9. #439
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    I'm overseas and should be sleeping now. I'm anxious to see what he has got.

  10. #440
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    Would you guys still be LOL if he really did die?

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