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Taylor: Avoiding Jitter in Composited Frame DisplayTaylor: Avoiding Jitter in Composited Frame DisplayPosted Dec 3, 2012 6:27 UTC (Mon) by Jonno (subscriber, #49613)In reply to: Taylor: Avoiding Jitter in Composited Frame Display by farnz Parent article: Taylor: Avoiding Jitter in Composited Frame Display
> Note that the driver for high frame rates on the link is 3D TV
Well, that might be *one* driver, but most non-3D TVs sold here for €200 or more operates at 100 Hz, and supports 1920x1080 input at 100 Hz over HDMI (1.3+). Probably 100Hz was picked because it is the lowest multiple of the PAL frame rate that don't suck when displaying NTSC content...
Of course, my dream display, a 32" 16:10 monitor with a 3840x2400 resolution at 100/120 Hz, would require a better link than DP 1.2 (Which is limited to 60 Hz at that resolution) or the not-yet-released HDMI 2.0 (which will match DP 1.2 but no more). Lets hope for DP 1.3...
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Taylor: Avoiding Jitter in Composited Frame Display Posted Dec 3, 2012 11:24 UTC (Mon) by farnz (guest, #17727) [Link] Are you sure it's 1080p100 on the link, not 1080p50 and upconverted to 100 Hz internally? The two are quite different - the internal upconversion won't affect the compositor on a PC, and one of the "joys" of consumer targeted marketing is that it deliberately blurs the difference between "1080p100" and "100 Hz display". I've not seen a TV here that does 1080p100 (in the UK) - most do "100 Hz motion processing" (i.e. upconvert incoming 25/50 fps material to 100 Hz), but I went for an LCD set that does variable frame rate - 23.97/24/25/29.97/30/50/59.94/60 fps, based on what the input is doing - instead of one that upconverts to 100 Hz. Of course, the ultimate, if we could afford the link bandwidths involved, would be a set where no pixel ever subtended more than half an arc-second on the viewer's eye, and the vertical refresh rate was 300.300 kHz, which is an exact multiple of all the commonly used frame rates.
Taylor: Avoiding Jitter in Composited Frame Display Posted Dec 3, 2012 12:16 UTC (Mon) by tuna (guest, #44480) [Link]
There are monitors which can accept a 120 fps input, but I do not know of any device that accepts 100 fps input. Do you have any links to such devices?
Taylor: Avoiding Jitter in Composited Frame Display Posted Dec 3, 2012 16:29 UTC (Mon) by dgm (subscriber, #49227) [Link]
I guess most TV sets sold in Europe would accept it. Here AC frequency is 50Hz, and the TV encoding standard works on multiples of that.
Taylor: Avoiding Jitter in Composited Frame Display Posted Dec 4, 2012 14:12 UTC (Tue) by tuna (guest, #44480) [Link]
Knowing is better than guessing. Can you name any device that accepts a 100 fps input signal?
Taylor: Avoiding Jitter in Composited Frame Display Posted Dec 5, 2012 12:07 UTC (Wed) by epa (subscriber, #39769) [Link]
In the old days there were plenty of CRTs which could manage 100Hz refresh. I tried to drive mine at that refresh rate whenever possible, being sensitive to flicker.
Taylor: Avoiding Jitter in Composited Frame Display Posted Dec 5, 2012 17:14 UTC (Wed) by dlang (✭ supporter ✭, #313) [Link]
refresh works significantly different on LCD screens vs CRT screens.
on CRT screens the image is drawn at one point and fades over time, refresh rate is how many times a second this point goes over the screen. there is always some flicker and high refresh rates minimize this
on LCD screens the image is stable, not 'draw and fade', different levels of brightness are achieved by flickering the pixels at different rates, but each pixel is run at that rate continually. Refresh becomes just the rate at which the image can be changed.
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