Archived from groups: comp.sys.ibm.pc.hardware.video (
More info?)
"sonia" <sonkar@wp.pl> wrote in message
news:52eee87b.0405140703.3d660aa4@posting.google.com...
> what's the difference between pixel response time of LCD and CRT
> monitors? are there any definite values of these monitors?
It's difficult to directly compare these, at least based on the
published specs. A CRT doesn't really HAVE a "pixel reponse
time," since it has nothing that could be considered as "pixels"
in the first place. The most relevant general comment to be made
here is that the response time of the phosphor to excitation by the
electron beam is virtually instantaneous; the phosphor will reach
maximum light output VERY soon after the beam strikes it, and
then will decay to its dark state some time (depending on the
"persistence" of the phosphor) after the beam moves on. For
the vast majority of phosphors used in computer monitors, the
decay time is on the order of tens of microseconds for the actual
light emission (measured as when the light output drops below
10% of the "excited" value).
In an LCD, the response time spec most often quoted is the
sum of the 10-90% responses for light transmission vs. the
time after that pixel is switched on or off (via a full-scale
transition - i.e., "fully black" to "fully white" or vice-versa).
The response time varies greatly with the LCD type and cell
technology; mainstream monitor panels presently provide
response times in the range of 15-25 ms, or about the same
duration as a frame of video. New developments continue
to drive this down, and we should expect to see response times
in the low single-digits (still in milliseconds) in panels at some
point. There probably won't be much point in driving this
a whole lot lower in the majority of applications.
Bob M.
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