LED Backlight flicker

[gamer282]

Hey all,

I have a rather nasty vision condition where my eyes are super sensitive to light etc. I notice LED flicker on poor LED backlit monitors/Laptops.

Now my question:

I currently have and HP 620 for work, it's really putting a lot of strain on my eyes as I have to turn down the brightness a lot which results in me seeing terrible flicker. It is an active matrix display as far as I know.

Now i've decided enough is enoigh and gone ahead and purchased the Acer E1 531 (I'm on a tight budget).

My concern is that this latop also is LED backlit and additionally, is active matrix too.

However, i've read that LED backlight can flicker from 80mhz to anywhere near 400mhz. Depending on quality?

I'm just hoping someone can help me out here with some advice as to if the Acer E-1 531 doesn't have such horrible flickering.

Complicated to answer I know sorry,

Any advice or info would be much appreciated.

 

[InvalidError]

80MHz? I don't think so. Even the FIVR in Haswell CPUs only operates at ~25MHz. Most board-level PWM regulators operate at frequencies well under 2MHz to mitigate switching losses and circuit complexity. Since the human eye can (usually) barely perceive flicker much beyond 60Hz, the backlight PWM frequency, which would usually be over 100kHz, would be absolutely imperceptible.

However, many displays these days use "lightboost" which strobes the backlight to reduce "motion blur" and power consumption and this would happen once per vsync inverval or ~60Hz. This might be what you are seeing. Try to find out if your laptop has some way of turning that feature off.

 

[gamer282]

80MHz? I don't think so. Even the FIVR in Haswell CPUs only operates at ~25MHz. Most board-level PWM regulators operate at frequencies well under 2MHz to mitigate switching losses and circuit complexity. Since the human eye can (usually) barely perceive flicker much beyond 60Hz, the backlight PWM frequency, which would usually be over 100kHz, would be absolutely imperceptible.

However, many displays these days use "lightboost" which strobes the backlight to reduce "motion blur" and power consumption and this would happen once per vsync inverval or ~60Hz. This might be what you are seeing. Try to find out if your laptop has some way of turning that feature off.

It could be that yes, I see the flicker moving up horizonatally. Unfortunately my vision is so sensitive to flicker so I see it most of the time UNLESS brightness on the LED backlight is set to 100%. This makes me think its a cheap LED backlight?

 

[gamer282]

With that said, the flicker is almost as noticible as a CRT running at 85mhz