Thanks for your reply AK.
FPS and shutter speed are two totally different things in video, both important though. The two together are like PWM (freq and duty cycle).
All of my video gear has max 120fps. Thus I should be able to see a digit in successive frames that are near 9msec apart, thus frame-1 is "2" followed by frame-2 of "1", but all I see is "8".
I have a timer app on my android phones, a Honor8 and MotoX android. When video'ing those timers I can see the msec digit moving very fast with my eye, and in the video I can see the msec digit very clearly, and although some time passes between frames each frame of video captures the msec digit, some blurry due to changing, others clear as day. The time seen in each frame does appear to agree with 120fps.
Having this info I believe the segments in these Kingbright displays are simply staying "hot" and are still emitting light even after the current stops for a fraction of a sec. I did contact their tech support to get on/off times for the LED's they use in these displays.
If it's the case that these LED's are just too slow, I can seek out very fast LED's and replace the msec digit with the faster LED's, etc.
FPS and shutter speed are two totally different things in video, both important though. The two together are like PWM (freq and duty cycle).
All of my video gear has max 120fps. Thus I should be able to see a digit in successive frames that are near 9msec apart, thus frame-1 is "2" followed by frame-2 of "1", but all I see is "8".
I have a timer app on my android phones, a Honor8 and MotoX android. When video'ing those timers I can see the msec digit moving very fast with my eye, and in the video I can see the msec digit very clearly, and although some time passes between frames each frame of video captures the msec digit, some blurry due to changing, others clear as day. The time seen in each frame does appear to agree with 120fps.
Having this info I believe the segments in these Kingbright displays are simply staying "hot" and are still emitting light even after the current stops for a fraction of a sec. I did contact their tech support to get on/off times for the LED's they use in these displays.
If it's the case that these LED's are just too slow, I can seek out very fast LED's and replace the msec digit with the faster LED's, etc.