Refresh rate TFT

[Tobias]

HI together,

as CRTs are hard to get nowadays, we equipped our labs with tft
screens. I wrote short and simple experiment to test the timing.
basically, there are 4 display elements, alternating black and white
background with nothing on it. As the refresh rate is 60 Hertz, I
first set the duration to 50 ms (which is about 3 refresh circles).
Prerelease is set on 20 ms.

These are the results (duration, duration error, onset delay
[according to logged data in results file])

slide 1: 50, 0, 5
slide 2: 50, 0, 0
slide 3: 50, 0, 0
slide 4: 50, 0, 0

These are the results for a duration of 40 ms

slide 1: 40, 0, 6
slide 2: 40, 0, 10
slide 3: 40, 0, 10
slide 4: 40, 0, 10

The first onset delay might be due to waiting for the next refresh
circle to start. If the duration value matches the screen refresh
rate, there seems to be no delay. If it doesn't (in this case, 40 ms),
there is a delay that adds up to the next value that matches (50 ms).
However, it is not clear to me how the duration arror can be 0 if
refresh rate and duration value do not match. The screen should not be
able to display something for 40 ms.

Any ideas? Any hints for using TFTs or testing the timing of such
screens?

Thanks a lot! Cheers, Tobias

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