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FRC - temporal dithering

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Re: FRC

Postby link » 10 Jan 2019, 01:59

Chief Blur Buster wrote:

Now....6bit+FRC, we're talking. That's big enough of a flicker ratio.


Would 6bit+frc fall under the plasma/dlp range of flicker? Is it greater than incandescent bulb flicker curve?

Would you know if a graphics card enables FRC or temporal dithering where does that fall in the flicker curve?

As a side note if a graphics card enables temporal dithering does it not depend on the display to be capable of FRC? As in if a panel is true 8bit or 10bit can the graphics card still make the panel dither?
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Re: FRC

Postby Chief Blur Buster » 11 Jan 2019, 23:16

6-bit = 2^6 = 2x2x2x2x2x2 = 64 = adjacent shades are 1/64th brightness steps apart
8-bit = 2^8 = 2x2x2x2x2x2x2x2 = 256 = adjacent shades are 1/256th brightness steps apart

FRC dithering only uses adjacent colors, so at most, you're getting 1/64th luminance changes (1.5% flicker) or 1/256th luminance changes (0.4% flicker). Incandescent bulbs have a bigger flickerdepth than that due to the AC current, as the filament partially cools off during the zero-voltage crossings on the alternating current.

So generating 10-bit (1024 colors) via 8-bit plus FRC, it's pretty gentle all things considered.

While 6-bit FRC flicker is just about detectable, even flicker from inversion artifacts is even a bigger flickerdepth than that. That said, panels that have 6bit+FRC also often have inversion artifacts. Many people give the wrong wild goose chase thinking (incorrectly) flicker from inversion artifacts is caused from the FRC. Though, there are indeed situations where FRC flicker and inversion artifact flicker can interact with each other if the FRC pattern is poorly chosen. For an example of flicker from inversion artifacts, see http://www.lagom.nl/lcd-test/inversion.php

PWM dimming is the thing you need to worry about more, because THAT is a 100% full flicker from total darkness to total brightness (essentially a squarewave flicker) rather than a gentle flicker.
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Re: FRC

Postby link » 12 Jan 2019, 03:54

Chief Blur Buster wrote:
PWM dimming is the thing you need to worry about more, because THAT is a 100% full flicker from total darkness to total brightness (essentially a squarewave flicker) rather than a gentle flicker.


Makes sense. Does oled tech have flicker since the pixels are able to be turned off or on completely like plasma? I read something about oled TVs aside from the pixel have a refresh cycle flicker at either 60hz or 120hz that is inherent to the tech. I don’t understand it fully though.
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