DIY 240Hz Non-interpolated zero-buffer display.

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Q83Ia7ta
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Joined: 18 Dec 2013, 09:29

Re: DIY 240Hz Non-interpolated zero-buffer display.

Post by Q83Ia7ta » 25 May 2014, 03:23

Chief Blur Buster wrote:
Q83Ia7ta wrote:XL2411T has 180 Hz PWM.
My XL2411T (Version 1) seemed to have this PWM at 360Hz (during 120Hz). I could easily see it occuring as a triple image effect in a TestUFO motion test (multi-image PWM artifact)
"(18 kHz instead of 180 Hz)" from
http://display-corner.epfl.ch/index.php ... ht_signals

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Chief Blur Buster
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Re: DIY 240Hz Non-interpolated zero-buffer display.

Post by Chief Blur Buster » 25 May 2014, 08:51

Yeah, the 180 vs 360 confusion, I'm wondering about that.
Q83Ia7ta wrote:
Chief Blur Buster wrote:
Q83Ia7ta wrote:XL2411T has 180 Hz PWM.
My XL2411T (Version 1) seemed to have this PWM at 360Hz (during 120Hz). I could easily see it occuring as a triple image effect in a TestUFO motion test (multi-image PWM artifact)
"(18 kHz instead of 180 Hz)" from
http://display-corner.epfl.ch/index.php ... ht_signals
I'm talking about the XL2411T (my unit appeared to have 360Hz PWM during 120Hz refresh), not the XL2411Z (PWM-free).
Also, the 18KHz PWM is actually made essentially PWM-free via the smoothing electronics:
so the fast PWM signal is converted to some analog maximal LED current by the LED driver and the fast PWM frequency cannot be found in the luminance traces anymore – the backlight is truly flicker-free.
- From the same page you linked.

Also, I think some monitors did 180Hz PWM during 60Hz, but went up to 360Hz PWM during 120Hz. That may be where the confusion of the 180/360 comes from for the XL2411T, or the different revisions (e.g. XL2411T firmwares). That might be it? I'll ask StrobeMaster.
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rabidz7
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Re: DIY 240Hz Non-interpolated zero-buffer display.

Post by rabidz7 » 21 Jul 2014, 21:39

Where can I get the board?
Rabidz7 is a: PowerPC Fan, LCD and x86 Hater, and a Plasma/OLED/CRT/SED/FED Lover

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