Thread: LCD Backlight Upgrade

  1. #1071
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    There is no such thing as TOO BRIGHT. Check out this thread, you will see that we are trying to get it BRIGHT. Worse comes to worse, if you do get it TOO bright, just do some dimming.

    Michael

    Sorry Scouse, I had to respond.

    Quote Originally Posted by Punisher
    Just one tube works.. it isn't very bright.. but atleast it verifies that the screen works properly and nothing else is wrong. The lower edge of the screen is brighter than the rest.. it isn't horrible though..

    I am probably going to pick up some CCFL's from this site
    http://www.elwirecheap.com/rawcocabu.html

    My only issue is .. how bright is to bright? I should use 2 CCFL's.. top and bottom.. maybe 3.. top, bottom and side.. just like the Lilliputs U-shaped CCFL..

    However, I am seeing numbers here of 32,000 cd/m2 .. How bright is to bright?
    ...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it.

  2. #1072
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    I was about to say same thing, no such thing as too bright..... too much heat, however could be an issue.....

  3. #1073
    MySQL Error Scouse Monkey's Avatar
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    oh god....

    3 edge lit CCFLs wont make your screen too bright. It is basic LCD brightness calcs that you have to factor in huge losses from the diffusers and the LCD. 32k cd/m2 CCFLs are standard. dont forget the surface area of your 2.6mm diameter ccfls is tiny. Then you loose 80-90% of the light due to the factors above. and at best you will be left with a 400cd/m2 screen.

    how are you going to hook up 2x6" and 1x5"? if you are thinking about using 2 separate inverters forget it. I will let you find out why because you need to do some mroe reading. It may work off a 3 tube inverter but with unbalanced tubes I dont know how it will react. a top and bottom 6" would be my choice. I would then get plenty of spares and run them slightly over spec. But not too much.

    I dont know why you expect two 6" and one 5" to be "really bloody bright" when your screen has this already if you add up the sides of the U shape.

  4. #1074
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    damn, while the cats away the mice will play
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  5. #1075
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    ARGHHHH You see this is my problem! I knew with the 1st PMs you sent me you were gonna be like this. I have seen it too many times on this damn forum.

    1. this is a backlight upgrade thread. people who come here look for new posts about the upgrade. While all this discussion and 'education' about CCFLs is all very interesting it is all pretty mcuh common knowledge that hasnt been discussed 10 million times over. The problem with asking questions like this in a huge thread like this is if someone breaks their CCFL and does a search then they have to trawl through this thread to look for answers and then they will probably give up as the thread is 1081 posts long and they cant be arsed reading it and they ask the same questions all over again. By all means make a thread an post a link here and in PM asking people to help.

    2. Your 1st PM to me was basically just a simple request for me to fix your screen. No 'hi....' just one line and no information about what you already know to be wrong. Wasting my time and not letting me give you the most thorough answer to your problem and was basically rude.

    3. You are not thinking before asking! I have a serious problem with spoonfeeding people all the answers as it never stops and ultimately I am not doing the person any favours as if people are told all the answers they learn about 10% of what they can if they find out for themselves. You are playing with CCFLs which is good. Experimentation is one of the best ways to learn but my problem is you are not listening or looking into things for yourself which is frustrating. You state above that you can run 3 separate inverters yet I stated before that and in a PM that you cant run separate inverters. I also said you should look into it to find out why - i even sent you a site that will have lots of info better than i can write it. HINT: look up closed loop systems

    I have never played with CCFLs in LCDs, i hadn't before we started this and I still havent - i just learnt all this stuff from doing my research and thinking about it. I have never even touched a lilliput screen!

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  7. #1077
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    ccfl's aren't contantly lit, they flutter at a freq. that isn't normally perceptable to the average human, although there are some that actually have reactions to this fluttering (learned this through research).... if you use multiple ccfl's they must be at the same frequency as each other........ if you use seperate independant inverters they will not be in sync with each other...... the result will be very perceptable & annoying..... that's the whole reason behind multiple ccfl inverters that use an internal closed loop system or multiple inverters that connect to each other in a closed loop design....

    if it was as easy as just hooking up three inverters to three bulbs don't you think others would have done this already? there are a LOT of other factors that determine the final outcome, either right or crap..... color teperature is another factor that I don't see you even mentioned..... if you want to do a sucessful backlight upgrade you need to learn what is involved through research..... if you just want it done for you that's another thing entirely.... if you don't have the time to learn & do all that is necissary then just buy another lcd...... especially if you were satisfied with it as is.... that may be your best option......

  8. #1078
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    Quote Originally Posted by turbocad6
    ccfl's aren't contantly lit, they flutter at a freq. that isn't normally perceptable to the average human, although there are some that actually have reactions to this fluttering (learned this through research).... if you use multiple ccfl's they must be at the same frequency as each other........ if you use seperate independant inverters they will not be in sync with each other...... the result will be very perceptable & annoying..... that's the whole reason behind multiple ccfl inverters that use an internal closed loop system or multiple inverters that connect to each other in a closed loop design....

    if it was as easy as just hooking up three inverters to three bulbs don't you think others would have done this already? there are a LOT of other factors that determine the final outcome, either right or crap..... color teperature is another factor that I don't see you even mentioned..... if you want to do a sucessful backlight upgrade you need to learn what is involved through research..... if you just want it done for you that's another thing entirely.... if you don't have the time to learn & do all that is necissary then just buy another lcd...... especially if you were satisfied with it as is.... that may be your best option......

    + using multiple inverts may not only result in annoying flickering but also other interactions more than sync problems but actual interference causing induced currents, uneven lighting, poor performance etc etc

  9. #1079
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    off the top of my head ????? no clue..... I'd have to look into it, research the specs & the available inverters..... that's what I would do if I was working a project like yours.......

    try calling the company that sells the bulbs..... sometimes you might get lucky & find someone there that just knows what you need.....

    you have a better chance of finding a whole replacement LCD than just a bulb for your screen, have you looked into that??? it might not be rediculously expensive to just replace the whole lcd.... that's the practical straight foward way of solving your problem,, anything else will take figuring out & research , testing..... possibally wasting money with nfg results..... good luck with it........ I'm back to screwing with my own screen.... I may have it done sometime this year

  10. #1080
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    Quote Originally Posted by Punisher
    I wish I could just find a stock replacement CCFL for my screen.. That's all I want.. No one has them tho.. I emailed lilliput.. they never responded.. probably because whoever got my email doesn't even know english.

    Have you tried Armen http://www.digitalww.com/?


    or for the UK


    Lilliput UK http://www.lilliputuk.com/

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