Backlight bleed on a screen refers to the occurrence of bright spots or patches along one or more edges of the screen. This can be caused by poor placement of the polarizing film during the screen manufacturing process. It is typically noticeable when the screen is in a dimly lit environment and displaying dark images. It is not a very bothersome defect as it does not affect the touch functionality or screen resolution, and in some cases, it is so subtle that the user may not even notice it.