Backlight Bleed Test

Backlight bleed is light that escapes around the edges or corners of an LCD screen. It appears as a glow or bright patches on a dark background — most visible in a dim room.

Start Backlight Test

LCD screens use a backlight behind the panel. Backlight bleed occurs when light escapes at the edges due to imperfect sealing. It is most visible on a full black screen in a dark room and is especially common on IPS panels — sometimes called IPS glow.

  • Dim the room: Turn off or reduce ambient light.
  • Set brightness to 80–100%: Higher brightness makes bleed more visible.
  • Allow eyes to adjust: Wait a few seconds after the black screen appears.
  • Look at edges and corners: Any bright patches or glows indicate backlight bleed.

A small amount of bleed is normal on most LCD panels — especially IPS. It usually does not affect everyday use. Excessive bleed visible during normal content (movies, games) is considered a defect and may qualify for a warranty replacement.

There is no reliable software fix. Slightly loosening monitor screws or gently massaging the corners can reduce bleed in some cases. For severe bleed, contact the manufacturer — most brands accept returns within 30 days.