The delay measured for 7 monitors
After practical tests, here is something more precise. This time we measured the possible delay of LCD monitors to a 1/1000th of second. We realised four points:
- the CRT monitor was never late compared to a LCD monitor.
- the delay isn´t due to the refreshing rate: 60Hz or 75 Hz doesn´t´ change anything.
- it isn´t due to the interface. One monitor won´t be faster in DVI than in analog. The double conversions do not slow down the monitor. It’s important to remind you that all CRT function with analog signals.
- the delay changes with time. We took ten measurements in a row to look for the maximum, minimum and, most of all average, delay.
In this example, the dell monitor is 32 ms late. This value comes back regularly and corresponds to a delay of two images.
Delay in ms compared to our reference Mitsubishi CRTMeasurements were taken with a DVI input at 60 Hz.
With a couple of exceptions (the ViewSonic VX922), the 6 LCD monitors are on average one to two images late (60 Hz = 1 images every 16.7 ms).
This delay is subject to variations. Here are three examples of delays (in ms) measured for 10 consecutive tests between the CRT and the monitor tested:
The VX922’s result is excellent and this compensates for the difficulties in the
19 inches survey.
