From 6ac99975cdb2bf668362f65fa9fa3ffb2127308b Mon Sep 17 00:00:00 2001 From: voidderef Date: Wed, 19 Feb 2025 17:45:25 +0100 Subject: [PATCH] konami/iidx: Document more details and known issues with pendual LCD --- konami/product/GULDJ-JI.md | 27 +++++++++++++++++++++++---- 1 file changed, 23 insertions(+), 4 deletions(-) diff --git a/konami/product/GULDJ-JI.md b/konami/product/GULDJ-JI.md index f68433f..99e21e5 100644 --- a/konami/product/GULDJ-JI.md +++ b/konami/product/GULDJ-JI.md @@ -8,13 +8,32 @@ * Input: DC 24V - 4A * Size: 42" * Visible size is 37". The remainder of the display area is covered by the bezel around the screen - * The input image is downscaled to the 37" visible area by the firmware of the monitor + * The input image is re-sized to the 37" visible area using the zoom feature of the firmware in + the OSD menu * Weight: 46kg * Power * Voltage: AC100V * Consumption: 100W - * Rated frequnecy: 50/60Hz -* Native resolution: 1280x720 + * Rated frequency: 50/60Hz +* Native resolution: 1920x1080 * Input: VGA, DVI * Known "manufacturing numbers" (`_` are redacted parts creating the unique identifier) - * `LDJUJIM_____` #WEB:https://twitter.com/kururusky/status/1601190433240936449/photo/1` \ No newline at end of file + * `LDJUJIM_____` #WEB:https://twitter.com/kururusky/status/1601190433240936449/photo/1` + +## Notes and known issues + +* The monitor has different OSD menu items depending on the current screen resolution provided, + e.g. 1080p vs 720p +* The firmware down-scales the image for 720p with rather poor results + * Flaky refresh rates of 59.970 hz to 59.990 hz if not enforcing fixed/custom timings via GPU + * Colors are different compared to 1080p (warmer?) + * Moving white objects have a yellow-ish gradient which might be a symptom of increased ghosting + * Display latency feels worse than in 1080p mode, likely due to the down-scaling being expensive +* The 1080p mode does not suffer from all the above and is the recommended operating mode for this + monitor +* The display's firmware is not capable of adapting to other refresh rates than 60.000 hz correctly +* Driving the display with any different refresh rate and the firmware compensates by occasionally + dropping frames. This can be tested with a (vsync-tester)[https://www.vsynctester.com] that's + alternating between frames allowing to spot frame drops. For example, driving the display with + 59.000 hz "works", but drops a frame every second. This results in an occasional stuttering when + displaying scrolling objects due to a skipped frame by the display (and not by the GPU!) \ No newline at end of file