2007-11-07 04:26:08 · 3 answers · asked by stereotyyppi 1 in Computers & Internet ➔ Hardware ➔ Monitors
Does human eye detect differences between 100hz or 75hz?
2007-11-07 04:30:18 · update #1
If refresh rate on a LCD display goes too high you can actually cause the liquid crystal molecules to physically break. Every cycle the liquid crystal molecules are rotated. Even if the image is still static they are given an equal, but opposite twist.
LCDs do not suffer from flicker in the same way that CRTs do. In a CRT as soon as a spot on the CRT is hit it begins decaying in brightness and is pretty near black when it is next refreshed. So the entire screen is constantly varying in brightness.
A TFT LCD maintains the same brightness until the pixel is refreshed and the setting changed. This is the entire reason for having the thin-film-transistor circuitry on the glass.
LCDs do not flicker like CRTs do, so a high refresh rate is pointless, from a flicker issue at least.
90%+ of the population can see a CRT screen flicker at 60 Hz. Because of the way your eye is made up flicker is most noticable when you do not look directly at the screen, but if you look just to one side of the monitor.
About 2% to 5% of the population can still perceive flicker at 75Hz.
I believe that this drops down to less than 0.1% at 85 Hz.
100 Hz is pretty much pointless. Especially as it will limit your resolution, and because the pixel clock is faster it will make the picture fuzzier and can make vertical lines significantly dimmer than horizontal lines.
2007-11-07 04:46:15 · answer #1 · answered by Simon T 6 · 0⤊ 0⤋
It's becasue they arn't designed to go any higher. Only recently have refresh rates gone up to 120Hz on the extremely expensive top end LCD TV's. Going above 75Hz is hard to tell the diffrence, above 120 would be nye' on impossible.
2007-11-07 12:35:22 · answer #2 · answered by gammawolf_rsn 2 · 0⤊ 1⤋
just cause thats the best that it can do
2007-11-07 12:28:27 · answer #3 · answered by Anonymous · 0⤊ 1⤋