Monitor Convergence Test
Press Full Screen and study the fine white lines on black. They should be pure white — a red, green, or blue fringe means your sub-pixels aren’t perfectly aligned, and this test shows how severe it is and whether it’s a real defect.
New to this? Here’s the plain-English version.
What this test is
Fine white lines on black that reveal whether each pixel’s red, green, and blue elements line up — or leave a coloured fringe.
How it helps you
It explains fuzzy, coloured edges on text and confirms whether it’s a fixable rendering setting or a real panel defect.
What we’re checking
Whether fine white lines look pure white, or carry a red/green/blue fringe that signals a convergence problem.
Look closely at the white lines. They should be perfectly white. Any color fringing (e.g., red, green, or blue edges) indicates a convergence problem. Check the center and the corners of the screen.
Press F11 or Full Screen · ← → patterns · Esc to exit
What Convergence Is
Convergence is the alignment of the three sub-pixel elements — red, green, and blue — that form each pixel. When they align precisely, fine white detail looks pure white. When they don’t, you get coloured fringing around high-contrast detail, most visible on white text against black. True convergence errors are manufacturing defects — they can’t be adjusted by the user, so the only question is whether yours is within tolerance or bad enough to return.
How to Use the Test
- 1Go fullscreen. Press Full Screen and bring up the fine line or cross-hatch pattern.
- 2Check white lines on black. On 1-pixel white lines against black, each line should be pure white with no coloured fringe.
- 3Scan centre to edges. Convergence errors are worst at the corners and edges — work outward from the middle.
- 4Verify it’s not angle-related. View straight-on and at slight angles. Convergence fringing stays constant; IPS glow shifts with angle.
Convergence Severity
| What you see | Assessment |
|---|---|
| White lines pure white, no colour | Convergence excellent |
| Very faint fringe, only visible inches away | Within tolerance — normal |
| Fringe visible at normal distance | Mild convergence issue |
| Distinct red/green/blue shadow on text | Significant convergence failure |
| Double image on fine lines | Severe manufacturing defect |
Not All Fringing Is a Convergence Error
ClearType / font smoothing deliberately uses coloured sub-pixels to smooth diagonals — that fringing is by design and disappears when you turn the feature off.
IPS glow can wash colours into bright elements at wide angles — but it shifts as you move your head. True convergence failure appears on fine detail at a normal distance and straight-on, and stays put.
If the fringing is really softness rather than colour offset, check native-resolution rendering with the pixel grid test, and confirm any isolated coloured dot with the dead pixel test.
Convergence FAQ
Can convergence errors be fixed?+
Is convergence the same as chromatic aberration?+
Does convergence only affect LCDs?+
How do I know if it’s ClearType fringing or a real convergence error?+
How much fringing is normal?+
Where on the screen is convergence usually worst?+
Does convergence affect image quality or just text?+
Related Monitor Tests
Checking a whole new panel?
Run the dead pixel test and browse the full monitor test suite.