Light leakage describes unwanted bright regions visible on dark content, often near edges or corners. Some nonuniformity can be inherent at high brightness in a dark room, while severe or localized leakage may indicate assembly stress or damage.
Diagnostic conditions
- Warm the display to stable operation.
- Use a full-black test image at defined brightness.
- Control ambient light, camera exposure and viewing angle.
- Compare free-standing and installed conditions.
- Record location, temperature, fastener torque and orientation.
Likely causes
- Bezel, screw, gasket or adhesive pressure on the panel.
- Twisted frame or insufficient mechanical clearance.
- Bonding stress, contamination or optical-film damage.
- Backlight/frame nonuniformity or transport damage.
- Camera overexposure exaggerating a normal condition.
Do not press the panel or loosen structural parts without an approved procedure. Corrective action may require adjusting enclosure support, gasket compression, adhesive design or replacing a damaged module. Define cosmetic acceptance with controlled test conditions and reference samples.
Review LCD damage-prone components, optical bonding materials and send defect evidence.
Reviewed 2026-08-28. Acceptance limits must use an agreed test method.
