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Thread: monitor dimming?

  1. #1
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    monitor dimming?

    hi, does anybody know if there is a way to automagicaly dim the backlight on a monitor when you turn on your parking/headlights? this would be a splended feature. i have not sean any with this feature, other than auto switch to av for back-up cameras. has anybody tried this or know of a way. i don't want to fiddle with the remote (doesn't work) or the buttons (don't have). if not it is fine the way it is i quess, just a thought.

    later

  2. #2
    FKA CivicModz
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    If your LCD has LED backlighting it's easy with PWM. You will need to find the LED backlight connections and connect a simple circuit to it. There are easier ways, and im sure there is a how-to thread on how to do this. Also if you have a fusion brain this will do it also.
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  3. #3
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    sounds like a reason to buy a knew monitor then, mine isn't LED

  4. #4
    Raw Wave
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    CFLs can usually be dimmed.

  5. #5
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    Quote Originally Posted by OldSpark View Post
    CFLs can usually be dimmed.
    my board is all all-in-one and i wouldn't now where to start, besides they bit me once. that was exciting. the LED way may be better for me, just through a relay and a couple restiors in the mix and should work i think. not after anything super high tech, just dim the monitor so i don't scare myself in the rearview at night. i assume the LEDs are only powered by 12 volt or lower so it just seems safer. no wake up calls. i'm kinda suprised that with monitors being made for cars that this has not made it to the table. i quess that would take all the fun and sence of acompishment out of it.

  6. #6
    Raw Wave
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    You dim the LV side - not the HV side.

    And since resistance does not work well for dimming LEDs, both have the same solution - namely PWM.

    So LED or CFL does not matter.

  7. #7
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    understood, where do i start? do i need to tap in just before the coil for the cfl's? and is there a schematic for a PWM or can they be bought? sorry for the noob questions, just never dug to deaply into monitors before. or is there a thread some where i did not find that gives a little direction. i would like to go LED backlight and liliput monitor but my system is screaming for a SSD, developing issues (AGAIN).

  8. #8
    Raw Wave
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    This assumes a primitive CFL inverter - just an oscillator on a dc supply - you PWM its supply.

    If it's a SMPS-type controller chip, you can't do that. But then you should be able to modify its feedback.
    (For some SMPS, the SMPS output can be PWM'd if the feedback line is filtered (RC delay) so the SMPS does not try to compensate for the PWM off time...)

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