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Thread: LCD Backlight Upgrade

  1. #21
    MySQL Error Scouse Monkey's Avatar
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    Quote Originally Posted by dragonBTV
    the LED is checper and easy to build for side mount project
    the 1W white LED costs $1 and you can simplly add 20 of them with Liliputs Hitachi LCD....
    dude. we have looked at all these options - trust me. We have looked at 1,3 and 5W LEDS but they all require cooling or they won't last very long. This cooling is bulky and a lot of people just don't have the room. I for one don't. The 3W LED is the equivalent of 60 normal LEDs but it runs at up to 70 degC and needs a heatsink.

    LED backlighting is still not used becasue it is not as straightforward as you think. If you point me to somewhere i can get 1W while LEDS that run cool then please show me as i would love to try them and eliminate the inverters from the solution all together.

  2. #22
    Variable Bitrate skippy911's Avatar
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    Quote Originally Posted by jcdillin
    Project FAQ

    How bright is this going to be?

    Well everything right now is a guess, but we are hoping for the 800 to 1000nit range. Untill we get the tubes and test them we really dont know.
    Will that brightness be with the touchscreen on?

  3. #23
    MySQL Error Scouse Monkey's Avatar
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    Quote Originally Posted by skippy911
    Will that brightness be with the touchscreen on?
    doubt it. TS robs 25% of the brightness. Unlessw e canget 300 orders for new ones that will only rob 8%!!

  4. #24
    FLAC
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    25% is an underestimate in my opinion. The specs are around 400 nits without TS and 250/280 with (depending where you read them / which LCD make it is). In my opinion it's probably worse since I find the blurring effect the TS has on the LCD makes it a lot less readable on top of just the washout effect the sun has.
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  5. #25
    MySQL Error Scouse Monkey's Avatar
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    yeah the 280 is normally knocked around.

    Typical specs for a 4 wire resistive overlay is 75% clarity though. (well thats what 'we' in the touchscreen business use anyway ) Then you have problems with extra glare and the fuzzyness.

  6. #26
    Raw Wave tj!2k4's Avatar
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    You guys should have a "Project Completion" progress bar or % in the FAQ post

  7. #27
    MySQL Error Scouse Monkey's Avatar
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    Quote Originally Posted by tj!2k4
    You guys should have a "Project Completion" progress bar or % in the FAQ post
    good idea but ithink it would be depressing!!!

  8. #28
    Raw Wave tj!2k4's Avatar
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    oh, i don't think so.. the mere fact that you guys are investigating this..... .brightens up my day =)

  9. #29
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    hahaha. I am just looking at how to build my LEd backlighting test rig again. i have 100 bright LEDs on the way over from the USA witht he CCFLs. (and yeah it was planned to try it before the above comments about trying LEDS)

  10. #30
    MySQL Error jcdillin's Avatar
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    faq updated
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