The display-driver technique that hides the physical bezel between LCD panels in a video wall by offsetting the image so straight lines and moving objects appear continuous across the seam.
What it is
Bezel correction (also called bezel compensation) is a layout adjustment applied by the video wall controller so that the physical gap between adjacent LCD panels does not interrupt the composed image. The controller renders the source as if the bezels were transparent — straight lines and moving objects appear to pass continuously behind the bezel rather than jumping across it.
How it works
Two approaches are common. The naïve approach simply offsets the source image on each panel by the bezel width in pixels, so the parts of the source that would fall on the bezel are hidden and the remaining segments line up. The better approach extends the source image into the bezel area mathematically and clips, so the apparent geometry is preserved even when the source contains animated content. Modern controllers do the latter automatically once the panel bezel-to-bezel and image-to-bezel dimensions are entered.
Why it matters
Without bezel correction, video walls look like collections of separate monitors. With it, the wall reads as one continuous image. The effect is psychological as much as technical: operators trust a corrected wall the same way they trust a single large display. DV-LED walls do not need this treatment — there is no bezel — and that is one of the reasons DV-LED has eaten market share from LCD walls in the 2020s. See DV-LED and video wall for the wider comparison.
Common pitfalls
- Forgetting to update bezel-correction parameters after a panel swap — even same-model replacements drift by a fraction of a millimetre and produce visible discontinuities.
- Spec'ing a wall on bezel-to-bezel measurements alone, ignoring the image-to-bezel offset built into the panel — the two are not the same number, and getting it wrong on day one is hard to fix retroactively.
- Choosing a wall on bezel width without considering colour and brightness uniformity across the array — even perfect bezel correction cannot hide visibly mismatched colour blocks.