Blur Busters Forums

Chief Blur Buster wrote: ↑

30 Aug 2023, 16:43

Ozzuneoj wrote: ↑

29 Aug 2023, 13:36

Ideally, we'd have high Hz and high FPS on OLED, combined with highly tuned BFI that can run at any Hz (within reason) on any device...

I am working with 3 OLED manufacturers to add BFI to 240Hz OLEDs -- but due to OLED backplane limitations for the current 240Hz panel fabbing, BFI is only available at half Hz or below.

I am not discontinuing strobe-based blur reduction. Retro applications are hugely popular these days, and that's why I helped the Retrotink 4K scaler add BFI and 3:2 pulldown deinterlacing.

I am dismayed at the discontinuance of 60Hz single-strobe options, and I am bringing that back the OLED via two approaches:
(A) Box-in-middle approach; and
(B) Work-with-manufacturer approach.

So you also have box-in-middle BFI injection options coming! That even outperforms LG BFI, due to its built-in HDR nits booster to brighten BFI, and even can do BFI during LG GSYNC VRR, for things like 48Hz film projector strobe at 96Hz custom ModeLine (using VRR as a conduit for custom BFI fixed-Hz).

Could you explain why strobing on OLED monitor displays is not possible at maximum refresh rate?! It was available in LG CX/C1/G1 series TVs, but for some reason it stopped being possible with C2/G2 and higher, where bfi became available only at half the refresh rate by replacing 50% with black frames. On the same cx/c1 it didn't work like that, and even the choice of pulse length was available, just like on LCD panels.

NNBombito wrote: ↑

11 May 2025, 08:07

Could you explain why strobing on OLED monitor displays is not possible at maximum refresh rate?!

1. Black frames requires minimum 2 pixel changes per refresh cycle (one to turn on pixel, one to turn off pixel)
2. Some OLED panels can only do 1 pixel change per refresh cycles.

NNBombito wrote: ↑

11 May 2025, 08:07

It was available in LG CX/C1/G1 series TVs, but for some reason it stopped being possible with C2/G2 and higher, where bfi became available only at half the refresh rate by replacing 50% with black frames. On the same cx/c1 it didn't work like that

That is because it's cheaper to manufacture a large brighter OLED panel that can only change pixel once per refresh cycle.

Panels are lithographed with active matrix transistors (panels are just giant integrated circuits) and sometimes you can reduce the number of transistors per pixel, by omitting certain features such as this. A workaround is to simply increase refresh rate, in order to get the extra pixel changes. This is the current approach now, for better or for worse.

NNBombito wrote: ↑

11 May 2025, 08:07

and even the choice of pulse length was available, just like on LCD panels.

That's because the strobing was outsourced to the backlight, not built into the panel.
OLED panels are 100% self contained (pixel switching AND light source in the same panel).

That's why good LCD strobe backlights can be more flexible, with different pros/cons.

Even with that, 120Hz+BFI OLED sometimes look better than 240Hz LCD strobing, to some human eyes picky about good colors and blacks. OLED motion blur is more "pure" (just linear persistence motion blur, with no LCD ghosting style effects) and is always perfectly zero strobe crosstalk (an effect of LCD GtG being too slow to finish between flashes of a strobe backlight).