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Which is better for tired eyes: LED or LCD monitor?

Discussion in 'Hardware Components and Aftermarket Upgrades' started by octavia, Jan 5, 2010.

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  1. octavia

    octavia Notebook Evangelist

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    Hello,

    Which monitor is easier on the eyes: LED or LCD monitor? I work very long hours in front of my monitors (not graphics, mostly texts) so I need to get a monitor that won't make my eyes too tired, preferably a matte monitor. I'll be using it to watch television also so I'd like a good quality monitor (not too bright) but that's not my main criterion.

    Thanks.
     
  2. vostro1400user

    vostro1400user Notebook Deity

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    LED is better. thinkvision L2440x is best for eye strain relax, dell G2410 second, imho.
    http://reviews.cnet.com/lcd-monitors/lenovo-thinkvision-l2440x/4505-3174_7-33343692-2.html
    "We noticed that when viewing the CCFL-based screen of the L2440p for more than a few seconds our eyes would feel strained; however, when looking at the L2440x's screen that is LED-based, we did not perceive of any strain. This occurred even when both monitors had their brightness set to zero. Your mileage may vary when it comes to eyestrain, but we thought it was worth mentioning. "
     
  3. vostro1400user

    vostro1400user Notebook Deity

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  4. davepermen

    davepermen Notebook Nobel Laureate

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    one thing to consider about led lights (actually two things)

    a) if they flicker, they flicker very synthetically, like strobos at parties. some of my lights (i have all leds at home) do flicker at 50hz, it's quite irritating :) shouldn't be a problem for a backlight, though..

    b) they don't have the full colour spec of the sun to represent white. they fit more the spectrum of the moon. the result: it's quite relaxing. even with a very bright led lit room, you will quickly chill down and can easily start to sleep.

    i don't think any of those matters much for backlights, but in general, led lights are very pleasing, and so are they as backlights.
     
  5. Explosivpotato

    Explosivpotato Notebook Consultant

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    Flourescent lights actually flicker, LEDs don't.
     
  6. timesquaredesi

    timesquaredesi MagicPeople VooDooPeople

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    only trust your eyes.

    go to a best buy and test out each of the monitors with lcd or led technology. your eyes will love the led - pictures look like they are printed on the screen as opposed to be generated on the lcd.... i duno, that's maybe a bad analogy but you will see what i mean in the store.

    my dv7t has a regular lcd display and my gf's dv4t has the LED. once i saw her led screen, i wish i had gotten my dv7t with it but it wasnt an option at the time. the display is so crisp, high res pictures look even better. the downside is that the led screens are really bright but that's nothing that brightness controls can't fix.
     
  7. davepermen

    davepermen Notebook Nobel Laureate

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    on AC, yes, on DC, no.. or the other way around :) i don't know which one is which right now :)
     
  8. Explosivpotato

    Explosivpotato Notebook Consultant

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    go try and run an LED on AC and let me know how that goes...

    :p LEDs only flow current one way, that's why they're diodes. They're designed to run with constant DC.

    Flourescent bulbs HAVE to run with AC, they don't work otherwise. That's why they have inverters.
     
  9. davepermen

    davepermen Notebook Nobel Laureate

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    well, try to get constant DC out of the power outlet, which is what my leds are plugged in at home.

    they have some form of inverter, too. so they get an asb(sin(t)) style pulse. now leds have a very quick getting bright curve, and not getting much brighter if you apply more power to it, so it will be mostly something closer to an abs(squarewave(t)) style curve. that, sir, is horrendous flickering.

    some have a tiny buffer to even it out. they deliver nice constant nonflickering lights. but some don't.



    i'm not talking about in-laptop-lights right now, just in case you're unsure :)

    just if you have some reason to get an led to flicker, be prepared for strobo-like behaviour.. :)
     
  10. surfasb

    surfasb Titles Shmm-itles

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    I second this. Nothing beats actually staring at a monitor with your own eyes.
     
  11. davepermen

    davepermen Notebook Nobel Laureate

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    and try to stare at the screen of the laptop you really buy, as they started to put different random screens in each laptop of the same series. just what's most cost efficient at the moment (this got noted on netbooks first i think)
     
  12. Explosivpotato

    Explosivpotato Notebook Consultant

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    Yes in some cases LEDs can be driven by pulsed DC, but this isn't the case in laptop monitors. The electronics in a laptop wouldn't run on anything but *very* clean DC power, and there's no point in taking clean DC power and then pulsing it just for the display - except when the display's light source won't light without an AC supply, like flourescent lights.

    They do have a device that is the analog of an inverter - it's called a rectifier bridge. This makes pulsed DC out of AC, and then a capacitor is used to clean the voltage.

    LEDs don't require much current at all, so I wouldn't be surprised if there was a capacitor in the LED units you run off of your AC home power. It doesn't take much to bridge the gaps in the pulses for such a low current draw.

    Sorry for going OT there for a bit, I spent an awful lot of time doing this stuff in Highschool, so I tend to ramble when someone starts a conversation on the topic :eek:

    In response to the original question, you really have to look at each display yourself to know the answer. Each person's eyes are different, and beyond pulsing of the display there are the factors of brightness, dot pitch, color depth, etc. that can cause irritation as well.
     
  13. davepermen

    davepermen Notebook Nobel Laureate

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    leftones, 4W, flicker when you move the hand in front of them, right ones don't
    [​IMG] [​IMG].

    but further stuff please in some offtopic thread/pm.

    laptops are DC, so should have constant led light anyways (and do, and look great thanks to it)
     
  14. puter1

    puter1 Notebook Deity

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    Why aren't all laptops going to LED screens yet?

    When you shop/look for a laptop, do they always advertise it has LED?

    Or is there cases in which they will list a HD screen but it will also be LED?
     
  15. Explosivpotato

    Explosivpotato Notebook Consultant

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    Generally they will advertise an LED screen, as it's usually a draw.

    Larger LED panels can get expensive, though. My 17" screen has 2 flourescent bulbs, most have 1. An LED backlit screen could have thousands of LEDs, even more as the screen size increases.
     
  16. lite2

    lite2 Notebook Consultant

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    I have a Samsung 225bw for my main monitor(Florescent), and a dell g2410(led) as 2nd/tv monitor. I love the Samsung, colors are good but the Dell makes whites look too purple/blue. If I adjust out the blue'ish tint it hoses general color quality. Example: If I view a photo with a person with a sky blue background and get the skin tones matching decent the sky is purple'ish.
    I gave up trying to get good color and just use it for media center and such.
    FWIW my notebook(led) has good color, nice whites, so it's likely just the design of the Dell.
     
  17. vostro1400user

    vostro1400user Notebook Deity

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    dell G2410 did have color fidelity issue comparing with CCFL screens and thinkvision L2440x LED screen, although its DisplayMate benchmark is the highest(97) while L2440x is only 88 but has much better color accuracy: http://reviews.cnet.com/lcd-monitors/dell-g2410/4505-3174_7-33581193-2.html?tag=txt;page
     
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