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Thread: 8.4 Lilliput Backlight upgrade Project

  1. #1
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    8.4 Lilliput Backlight upgrade Project

    Ok, so I have been thread crapping on turbo's and the alternative backlight success one... so I guess as I start to have progress I should have my own to put stuff in. So, here it is..

    Project... Take an 8.4" lilliput touchscreen and make it hella bright for my convertible environment, make it fit, make it as affordable as possible, make it reliable and long lived and hopfully make a template for others to follow for these more common screens then turbo's very successful project.

    I am following fairly closely in his steps... same LED's similar drivers... only difference is his were rated for more lights then mine cause he had 32 I think.. I'm planning 18.

    Currently I am planning on the 18 led's mounted to aluminum plate with a liquid cooling system. Aluminum frame for sturdy and versitile installation. The liquid cooling system is likely the part that will scare most of you away...

    alot of you may have seen turbo's and his is great, but overkill for our smaller screens... I think he says it was overkill for his screen. Mine will utilize a standard off the shelf pc cooling system in a 5.25 mount chassis. The resevoir, pump, fan control, temp control and everything is in the chassis... comes with an extra external radiator with fan to mount someplace else... probably under the hood for me. Easy to install, only requires monthly fluid topped off (anti freeze water mix) won't freeze... won't corrode, but will short out electronics unless you use something like ammonia instead of water I think... maybe somebody can tell me this part. It also has alarms if it fails, runs low on water or overheats. Has auto modes or a knob for setting fan and temp settings as well as an lcd for status. Glove box here we come! Actually I think I will mount it in the old clock pod depending on the fan noise or if I can set that fan as backup for high heat and let the one in the engine bay do the rest.

    Also in the works is photoresistor based diming with overrides or the possibility of computer control of brightness.

    So, with all that, I have a couple of prelim pictures with the test I have done thus far... very promising. I have gotten alot of the stuff... except for the cooling and some of the aluminum... and my screen is defective but that will get replaced. Below I have the dc to dc I built to supply the 5 volts and 12 volts to the molex of the cooling system... and a cardboard and 7" lilli hybrid running off of only 9 of the 18 Luxeons and its BRIGHT.


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    I will post them as soon as I have them... unfortunately I'm working full time and going to school full time right now... and I'm in two bands, so I'm pretty busy, but I want to get this done cause I am selling my sunfire and replacing it with a spyder this spring so I want to be ready to go... Unfortunately its going to be too big for you I think... the screen is going to be about 3" deep without the cooling block. Then probably 4 with the cooling block... if you have space and want to modify I could help you get one as slimline as possible that could slide...

    I don't think you could get away with open air cooling even though you won't be enclosed in the dash... I think it will be too hot... you might be able to get an aluminum plate with the fins cut in it but that would increase its depth even more I think.

  4. #4
    FLAC coucouillu's Avatar
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    Quote Originally Posted by dmcdlrn
    Unfortunately its going to be too big for you I think...
    You're right!

    For me I will stay on my DRAGON LED solution but I only just want to see your work .

  5. #5
    MySQL Error jcdillin's Avatar
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    are you putting them into a staggered pattern or a even row, column pattern?
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    Planning staggered... I think I will copy the pattern turbo used... just half the pattern cause I have half the lights basically... should be 4 3 4 3 4. In the picture above I have 9 led's... 3 rows of 3 and I realize that pictures of high bright devices in the dark normally show little hotspotting if its there, but mine had NO hotspots at 2.5 inches and 9 led's... it should be better when 18 of them... as long as my fundamental thinking is straight.

    Update news! I received my 1/4" aluminum heat plate today courtesy of my Pop.

  7. #7
    MySQL Error jcdillin's Avatar
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    sounds good and i'm planning 18 for my 7" probably a bit overkill
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    uh, ya... I wouldn't... its excess heat that you will have to get rid of... Remember that the reason I'm doingi 18 is cause I have a convertible and alot of direct sunlight.

    I would be worried about ambient temps and getting them all in there... I would definitely use copper for your backplate.

  9. #9
    MySQL Error jcdillin's Avatar
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    yup thats the plan.
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    Ok, pics for the masses!

    Aluminum plate:



    and, Bench test with my new screen as is after I finally got it to work... although I still am trying to get a new one so I can't touch it yet...


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