Dirty Screen Effect Test
Dirty Screen Effect (DSE) is often invisible on static images but becomes glaringly obvious during camera pans in sports or video games. This test provides adjustable-speed horizontal and vertical panning patterns across 5%, 10%, 20%, and 50% gray fields.
Technical Scope & Limitations
Visual inspection tool. Evaluates perceived motion uniformity; does not measure panel backlight diffuser thickness.
Browser rendering output can be influenced by OS display scaling, GPU driver color settings, and active HDR profiles.
- Enter fullscreen mode.
- Observe the smooth panning motion across the neutral gray field.
- If you notice static smudges, vertical stripes, or cloudy patches that appear fixed while the background moves, your panel exhibits Dirty Screen Effect.
- Adjust panning speed or switch between 5%, 10%, and 20% gray levels.
What This Test Checks
- Dirty Screen Effect (DSE) visible during panning motion.
- Vertical banding caused by backlight LED strips.
- Clouding and uneven liquid crystal layer distribution.
- Motion uniformity across 5%, 10%, 20%, and 50% gray backgrounds.
How to Perform the Test
- Enter fullscreen mode.
- Observe the moving background as it pans horizontally across the screen.
- Focus on whether any stationary smudges or streaks appear "glued" to the display glass while the background moves.
- Toggle between horizontal and vertical panning and test multiple speed levels.
What to Look For
- Static vertical bars or dark smudges that stay in place as the pattern glides past indicate DSE.
- DSE is especially disruptive when watching sports (e.g. hockey ice, football grass) or during camera pans in gaming.
Common Display Problems & Diagnostic Guidance
What Causes Dirty Screen Effect?
DSE is caused by minor manufacturing variations in panel thickness, diffuser sheet alignment, and LED backlight spacing. Virtually all LED-lit LCD displays have some degree of DSE, but extreme banding is considered defective.
Frequently Asked Questions
Is DSE visible on OLED panels?
OLED panels do not have a backlight or diffuser sheet, so they eliminate traditional LCD DSE. However, OLEDs can exhibit near-black vertical banding on 5% gray fields.