In video engineering, "blanking" is the period when a video signal is suppressed. This happens between frames (vertical) or lines (horizontal) to allow time for scanning mechanisms to reset or to carry metadata without displaying it on the screen. Common Contexts for "HDBlank"

Set the horizontal and vertical blanking intervals (H-Blank and V-Blank) according to HD standards like 720p or 1080i/p.

Are you working with (like a camera, transmitter, or monitor) or software (like OBS or video editing)? Is "HDBlank" a specific button/option you see in a program?

Used to generate a perfectly black or "blank" High Definition frame to calibrate equipment or check for signal noise.

Professional displays or projectors may have a "Blanking" feature to hide edges of a video that contain artifacts or to fit a specific aspect ratio. How to "Put Together" the Feature