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Thread: why dont people use "home" screens with inverters?

  1. #11
    Newbie BennY-'s Avatar
    Join Date
    Jan 2006
    Germany, Cologne
    i think it's a big waste of energy to use an inverter.

    hit me if im wrong, but all lcd displays/controler work with low DC <24v.
    there are also models with external ac/dc converters. so why not remove the ac/dc converter and replace it with some good dc/dc converter?

    about the laptop screens, this isn't impossible, but most people don't want to bother with lvds and getting an working controler board. in germany/austria there is a "do it yourself beamer"-scene which uses this stuff, this is where i bought a 10" WXGA Laptop Screen with Controller.

    this is how such sets look like:

  2. #12
    Raw Wave
    Join Date
    Nov 2009
    Yes. Long gone are the days of requiring HV supplies for monitors. Even when components need HV, they are now usually supplied by onboard converters (that's much cheaper if nothing else).

    And yeah - most "AC" devices are usually 12V DC or less internally though 24V DC is not uncommon.

    I was going to re-reply about contrast and and that "home" screens may not have the correct polarisation nor be suitably ruggedised for automotive use (vibration, heat. humidity, UV) and suggest bypassing a display's ac-dc conversion.
    As I stated or inferred earlier - at best, inverters usually add AT LEAST 20% inefficiency (losses) compared to using DC or dc-dc converters.

  3. #13
    Constant Bitrate ephect's Avatar
    Join Date
    Jul 2007
    Melbourne, Australia
    Quote Originally Posted by settra View Post
    for the first, i cant really disagree cause i dont know (althoug, inefficient, in like 20watt that a screen uses, is nothing)
    but on the second, you are completly wrong. home monitors, as long as they are gloss and not matt, are ultra bright. "lumens" are not everything when it comes to SEE the screen. car monitors have at best 250 contrast, when hoem screens have from 50.000 to ++++ making them very easy to be read. In my case, even with the sun reflecting on the screen, i can see very easy!!
    dynamic contrast vs static contrast are totally different. Static contrast is what you need to look at, not dynamic which is what the manufactures use to suck people in to buying their screens, which is very misleading... Contrast is not the be all and end all, its about the gamma curve that gives you the better picture quality.

    if anything, use a laptop panel and driver board, as its been mentioned why waste power upscaling dc to ac using an invertor, to a screen which drops it from ac down to dc.. more efficent and smarter ways to do it, just not the easiest.
    Last edited by ephect; 05-19-2013 at 07:10 PM.

  4. #14
    Variable Bitrate
    Join Date
    Feb 2005
    West Valley City, Utah
    I always wondered.why people throw around big words like inefficiency.

    20% less efficient then a dc converter....

    lets do some math.

    20 watt lcd. 20% inefficiency using an inverter...

    24 watts.... who's going to notice the extra 4 watts? your talking less then 1/3 of an amp, assuming 12 v's .
    Progress,.... that is what I keep forgetting ;)
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  5. #15
    Raw Wave
    Join Date
    Nov 2009
    You are forgetting the inverter overhead, ie its idling current.
    It may be small, and dc-dc converters may have their equivalent, but many inverter efficiencies are quoted at a given output to disguise the overhead. EG - a 300W inverter at 80% of full load may have a 90% conversion efficiency, but then subtract the 10% inefficiency cause by its 30W constant loss at ANY output load.
    That does depend on design, but dc-dc converters often have a very small overhead and hence have a higher and flatter efficiency (curve) throughout its 1-100% load range.

  6. #16
    FLAC PhilG's Avatar
    Join Date
    Mar 2009
    Ontario, Canada
    The other thing not mentioned here and likely the biggest factor is home monitors typically start at around 15". Most people don't want something that big, it won't integrate into the dash and is very obtrusive hanging off the dash. Also too bright at night with so much surface area lit up.
    My 2007 Ford F350 Work Log located HERE

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