Photo of an analog VSYNC signal

This is the vertical blanking interval. It allows displays to synchronize to the next refresh cycle. We used to see it on analog TVs in 1930s through 1980s when the picture rolled during lost sync. Known as vertical synchronization, aka VSYNC (it is also padded with Front Porch and Back Porch) This hidden sync signal still exists in digital signals, DVI, HDMI, DisplayPort, and is seen on PCs and Macs via Custom Resolution Utilities.

Games and graphics card often have a VSYNC ON or VSYNC OFF setting.  But have you ever wondered where VSYNC comes from?  It stands for Vertical Synchronization. From the video signal perspective, it is a signal to the display to begin a new refresh cycle.

If you grew up in the days of old analog TVs in the 1970s/1980s, you may remember that black bar in a rolling picture — from a misadjusted VHOLD setting.

Here’s a picture of the analog version of VSYNC, used by TVs since the 1930s!

Advanced users: See Custom Resolution Utility Glossary


New 2017 Strobe Utility Supports Zowie Monitors

Blur Busters Strobe Utility is now Zowie compatible!

In addition to several BenQ Z-Series monitors, the Zowie XL2411, XL2420 and XL2720 are now supported.

The utility can eliminate the strobe crosstalk double-image effect on some models of BenQ & Zowie monitors. Mixed BenQ/Zowie multiple-monitor setups are also supported, adjusting all monitors simultaneously.

Go download it here.

 


Engineering for High Quality Display Motion Blur Reduction

Many new gaming monitors now support optional blur reduction such as LightBoost, ULMB, MOTION240, DyAC, and other brands.

Some gaming monitor manufacturers are better than others in doing Motion Blur Reduction on an LCD panel (without bad strobe-crosstalk double-image effects).

Here is a very good annotated diagram of how difficult it is to engineer high-quality strobe backlights and scanning backlights. This is a diagrammed frame of a high speed video of an LCD panel.

Geeks, engineers, and advanced users can also see Electronics Hacking: Creating a Strobe Backlight, to understand the science/physics of motion blur reduction via backlight strobing.


Microsoft EDGE browser still stuck at 60Hz in W3C violation

Unfortunately, the Microsoft EDGE web browser still does not support www.testufo.com at anything higher than 60Hz on over 100+ gaming monitors.

EDGE 15 from Windows 10 Creator’s Update still has not fixed this problem, even as gaming monitors begin to proliferate (FreeSync, GSYNC, 120/144/240Hz, etc) — there is now over a hundred models available when added together.

Specific members of Chromium & FireFox teams purchased 120Hz+ monitors and fixed their browsers years ago, as confirmed via their BugZilla tracking systems. This is a W3C standard “requestAnimationFrame”.

We wonder why Microsoft has not caught up yet on this W3C standard.

UPDATE: Mark Rejhon, with prior industry standards writing experience, has submitted a suggested modification to W3C HTML 5.2 DRAFT 8 based on industry feedback.