Samsung Patents a Glass-Cutting Method That Kills Edge Moiré on Displays

By Patentlyze Team · Updated May 29, 2026

That subtle rippling or grid-like distortion you sometimes see at the edge of a phone screen? Samsung thinks the fix is in the angle of the glass cut — and they've patented a process to get it right.

What Samsung's angled display window actually fixes

Imagine you're watching a video on your phone and notice a faint, wavy pattern shimmering near the corners or edges of the screen. That's called moiré, and it happens when light bends through the glass cover at the wrong angle, causing the pixel grid to interfere with itself visually. It's subtle, but once you see it, it's hard to unsee.

Samsung's patent describes a way to grind and shape the edge and chamfer (that small beveled corner where the flat front and the side of the glass meet) of the protective window glass at a very precise angle. Instead of cutting straight down, the glass edge is given a calculated slope based on the glass's own refractive index — basically how much it bends light.

The idea is that by tuning the physical geometry of the glass edge to match the optical properties of the material, the distortion cancels itself out before it ever reaches your eyes. It's a manufacturing-level fix, not a software patch.

How slope angle and refractive index remove the distortion

The patent covers both a window design and a processing method for cutting that window to spec. The window here means the protective glass layer (like Gorilla Glass or Samsung's own Armor Aluminum equivalent) that sits on top of the display panel.

The key structural innovation is the straight section of the side surface — the vertical portion of the glass edge that sits perpendicular to the panel. In a conventional display, this section is cut straight down (90 degrees). Samsung's method gives it a designated slope, meaning it leans inward or outward at a calculated angle relative to the panel normal.

The processing workflow the patent describes has four steps:

• Refractive index setting — measure or look up the optical properties of the specific glass material being used
• Processing scheme selection — choose a cutting/grinding method suited to that material
• Chamfer value calculation — compute the exact bevel angle at the corner that corresponds to the refractive index
• Machining — physically grind the side surface and chamfer to those calculated dimensions

The underlying logic is geometric optics: light entering the glass at the edge refracts (bends) according to Snell's Law. If the physical angle of the glass surface is tuned to match how much the material bends light, the exit angle of the light can be controlled precisely enough to prevent the interference patterns that produce moiré.

What this means for foldable and edge-to-edge Samsung screens

Moiré at display edges is a known annoyance in high-pixel-density phones and foldables, where the gap between the display panel and the cover glass is minimized. As Samsung pushes thinner, more edge-to-edge designs — especially in the Galaxy S and Z Fold lines — the geometry of that glass edge becomes more optically consequential, not less.

What's notable here is that this is a manufacturing process patent, not a materials or software fix. Samsung is essentially encoding the optical correction directly into how the glass is cut, which means it doesn't require any display calibration software, doesn't eat into processing headroom, and applies equally well to OLED and future display types. If this ships in production tooling, it's the kind of quality improvement you'd only notice by its absence on competitor devices.

Editorial commentary on a publicly published patent application. Not legal advice.