Originally Posted by dalandis
Probably the best example of the worst case scenario (and the effect that causes the most concern that I have to retreat from plasma) is this sort of intense color flashing. For instance, if I change the ration to 4:3 and it puts up those gray bars... those gray bars are not flat gray color to me... they sort of radiate pulses of colors as my eyes move over the image. (Same thing happens over the whole screen if I watch black and white movie like Casablanca). It becomes less noticable when watching something like Robots... I could live with that... but when it does hit me, it sort of hurts... and when watching SD or HD it is much worse. Now that I know that this happens, when I am in Best Buy and walking down the plasma row... if I turn my head fairly fast I see a BRIGHT GREEN spear jab at my eyes from all the plasmas. (Also, if I wave my hand in front of the screen my eyes see lots of rainbow colors between my fingers - not that I watch TV that way... but I've seen others that complain about this issue to describe the same trick.)
Our peripheral vision is more sensitive to motion (changes in brightness) and indeed, plasma pixel brightness is controlled through pulses on the order of milliseconds. These and other factors must be conspiring with your vision system to produce the phenomena you are perceiving.
Perhaps I am a cylon?
Now... your comment about 72 Hz Pioneer Elites... I think I saw one of those units at a local HomeMedia (but don't know if it was running at 72 Hz)... are you suggesting that the 72 Hz is a pulse rate (sorry if my terms are idiotic) that is similar to CRT? Would that be the standard setting for that unit?
72 Hz would be the refresh rate--the rate at which entire frames are displayed on the screen. The pulse rate that controls pixel brightness is somewhere in the millisecond (thousandths of a second) range.
I've been wondering in this process if somehow my CRT watching all day (graphic designer on a LACIE CRT) has trained my eye to a certain pulse... and the plasma uses a different one... and my eyes keep snatching at the pulses? Is this even possible? The reason I wonder that is it felt (but perhaps phantom feelings) that when I return to work after massive testing sessions on the plasma, that I see YELLOW screaking on my CRT... something that has NEVER bothered me in 15 years of working on a CRT. CRTs have never been a strain for me... computer LCDs never seemed as good to me as my CRT. (laptop LCDs actually seem to hurt my eyes)
What do you think 1920x1080? Does this provide any clues? Again... can't be the TV because my wife stands next to me saying that she cannot see them.
That's a very interesting observation. I know that our vision systems do adapt to varying degrees as individuals. Ever been on a cross-country trip cruising comfortably at 90 for hours? When you slowed down to something more sedate, like 60, didn't it seem like you were crawling? Things really do seem to happen more slowly for racing drivers at 190 than for those of us that do not spend a great deal of time at those speeds. Heck, after a couple of hours of Gran Turismo, real driving at everyday speeds seems really slow to me. I've also found over the years that I've become sensitive to CRT refresh rates. Anything below about 75 Hz is bothersome to me...initially. When I'm overseas, 50 Hz PAL is distracting at first, but I become "acclimated" after a few days. Hmmm...now that I think about it, the flicker does remain noticable in my peripheral vision, especially when my eyes are scanning something, as when reading...
CRT's designed for graphics designers are known for high refresh rates, on the order of 100-120 Hz. Just out of curiosity, what is your LaCie set to?