Do you mind PWM backlighting

[Air tree]

Well i'm getting a PB278Q and it has pwm lighting and i'm wondering if you guys mind it? Do you have problems with them?

[Excon]

Whats PWM lighting? The only PWM thing I know of is fan control.

[Joe3417]

ya wtf is pwm lighting lol

[Glenwing]

Whats PWM lighting? The only PWM thing I know of is fan control.

 

PWM is used for brightness control in monitors, it pulses the voltage to the backlight quickly instead of having it constantly on.  It (should) appear as smooth to your eye, you won't see the flickering, but there would be slightly less brightness coming from the backlight.  However the lower you turn the brightness, the less "on" time is in each pulse to make it let out less light overall, and appear dimmer (it modulates the width of the pulse, hence, pulse width modulation or PWM), so at low brightness flickering might become visible to people with sensitive eyesight if the PWM implementation is sub-par.

 

It's the same concept as with fans, instead of constant voltage you feed it in quick bursts, and you can modulate how much voltage and how much nothing is in each pulse, and so dynamically control the speed of the fan that way.

 

And to answer the question, it doesn't bother me on a PA248Q but I haven't tried lowering the brightness to see if I notice it I keep it about about 60% though and it is not visible to me.

[_ASSASSIN_]

I think it's PLS lightning he's referring to
but anyways, the blacks won't look that black (as it has a ton of backlight, you can adjust that) but it's pretty decent

[Air tree]

For anyone who doesn't know http://www.tftcentral.co.uk/articles/pulse_width_modulation.htm

[Emperor_Piehead]

Well i'm getting a PB278Q and it has pwm lighting and i'm wondering if you guys mind it? Do you have problems with them?

The Dell U2713HM has w-led so that the pwm backlight doesn't cause a flicker if that is an issue for you . 

[nishank93]

PWM is used for brightness control in monitors, it pulses the voltage to the backlight quickly instead of having it constantly on.  It (should) appear as smooth to your eye, you won't see the flickering, but there would be slightly less brightness coming from the backlight.  However the lower you turn the brightness, the less "on" time is in each pulse to make it let out less light overall, and appear dimmer (it modulates the width of the pulse, hence, pulse width modulation or PWM), so at low brightness flickering might become visible to people with sensitive eyesight if the PWM implementation is sub-par.

 

It's the same concept as with fans, instead of constant voltage you feed it in quick bursts, and you can modulate how much voltage and how much nothing is in each pulse, and so dynamically control the speed of the fan that way.

 

And to answer the question, it doesn't bother me but I haven't tried lowering the brightness to see if I notice it I keep it about about 60% though and it is not visible to me.

You learn something new everyday.

Anyway, @Air tree, if you're really concerned, go with Dell. I doubt the Asus will be trouble though.

[GoodBytes]

Glenwing, explained it very well.

PWMs are used as a cost effective way to control the brightness of LED backlight monitors.

 

Dell doesn't use a PWM backlight on it's higher end models.

The U2713HM, U2413, U2713H, are example of models that don't use a PWM.

However, the more affordable models, like the U2412M and U2312HM, do uses one.