Red line around screen perimeter
My ipad has started showing red lines around the perimeter of the screen. Does anyone know what has caused this?
iPad Air (5th generation)
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The phenomenon that you describe is known as “backlight bleed” - and is often attributable to a defective screen.
The LCD screen has a backlight that illuminates the screen from behind. The screen construction is such that the screen is edge-lit by Light Emitting Diodes (LEDs) distributed around the periphery of the screen; a screen diffuser layer distributes this light across the rear surface of the screen to provide even illumination across its full surface.
The diffuser is a laminated component of the LCD screen. In some circumstances, this layer can de-laminate from the LCD - allowing light from edge backlights to leak (or “bleed”) into the visible edge of the screen - this effect being most noticeable in dark environments with a bright screen.
The only remedy for this fault is screen replacement - which may be expensive. If within warranty, this should be fixed by Apple for free.