This. Sort of. Well, almost. You started off on the right track, anyway. But neither "top end Dell" nor "$1000 Eizo" will get you a monitor without PWM.
For the uninitiated, PWM stands for Pulse Width Modulation, and essentially, the PWM component blinks the LED backlight quickly in order to dim the brightness. The dimmer your backlight, the longer the "off" time. Sometimes, PWM use causes a perceptible flicker. What is perceptible and what isn't is subjective, however, and sometimes the flicker is imperceptible to a person, but still causes eye strain. Some PWMs blink faster than others, and faster-blinking units are generally regarded as easier on the eyes. Note that the use of a PWM isn't necessary -- LEDs _can_ dim, but since LEDs don't have linear electricity->lumens output and dimmer LEDs can experience a color shift, it's the easy way out. Most monitor backlight engineers take it.
I'm quite sensitive to PWM flicker. LED monitors especially tend to drive me nuts, so I did my research on this.
A couple of months ago, I compiled a list of no-PWM monitor options, from scouring tftcentral.co.uk, prad.de, and message boards around the internet. My criteria:
- IPS, or comparable (though all TN panels would use PWM anyway)
- no PWM, period -- not even really, really fast ones.
- preferably non-glossy, but any options will be considered.
- minimum resolution: 1920x1080
That's it. No size restrictions. These are the options I came up with:
- DGM IPS-2701WPH
- Dell U2713HM
- HP zr2740w
- Samsung S27B970D
- ViewSonic VP2770-LED
[Note that the Samsung, while it doesn't utilize typical PWM tech, does fluctuate according to some tests. For this reason, I did not consider it further.]
I found it interesting that all options were 27".
I, personally, bought the HP zr2740w, and I enjoy coding on it quite a bit. It's worlds easier on my eyes than any LCD monitor I've used in the past. Newer models such as mine (which was made in late 2012) apparently have a less aggressive anti-glare coating than older versions. Fine text is crisp using either gray-on-black (my preference) or black-on-white (the web's preference). White screens do not seem at all "dirty", as some people complain about the older revision.