VESA Adaptive-Sync: the certification for high refresh rate monitors

VESA launched theAdaptive-Sync Display Compliance Test Specificationa certification program that was created with the aim of providing consumers with a simple and accurate method to evaluate the performance of screens capable of supporting the protocol VESA Adaptive-Sync. The latter is nothing more than a form of Variable Refresh Rate adopted by VESA in 2014 and added to the DisplayPort interface protocols (we also mentioned it in the discussion on HDMI 2.1).

The program includes two distinct certifications, each of which is linked to a specific logo which obviously requires different requirements. To obtain compliance it is necessary that the products pass all the tests prepared by VESA: in total there are more than 50 and with methodologies that are illustrated in This Page.

The first of the two certifications is called VESA Certified AdaptiveSync Display and, along the lines of VESA DisplayHDR (naturally in different areas), certifies the performance of gaming monitors by focusing on managing the highest refresh rates and low latency of the panels. The logo is combined with a numerical value that immediately identifies the maximum achievable frame rate: we are talking about VESA Certified AdaptiveSync Display 144, 165, 240, 360 etc. Among the main requirements we find a minimum refresh rate of 60 Hz while the opposite extreme must reach at least 144 Hz.

The first models to receive the VESA AdaptiveSync Display certification are the LG UltraGear 27GP950 And 27GP850, thanks to the collaboration with the Korean brand that has been involved in the development of the program from the beginning. However, there are other already compatible products made by LG and Dell:

The second certification is called instead VESA Certified MediaSync Display and does not establish a level of performance: the objective here is to ensure correct viewing of the videos in order to eliminate the so-called “jitter”, that is theabsence of clicks due to inconsistencies between the input refresh rate and that actually used by the monitors. Screens capable of operating in a minimum range between 48 Hz and 60 Hz and to handle videos with the following frame rates (without frame loss):

  • 23.976
  • 24
  • 25
  • 29.97
  • 30
  • 47.952
  • 48
  • 50
  • 59.94
  • 60

Compatibility with 47.952 fps and 48 fps is required to duplicate frames of content at 23.976 or 24 fps (repeats each frame twice) and view movies without jerks. The operation can be entrusted to the GPU or to the monitor itself. Obviously, nothing prevents you from further increasing the number of repeated frames, tripling them or more, on products capable of operating at a higher refresh rate (duplication at 48 Hz is the minimum requirement).

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