The issue usually appears as a thin vertical green line that stretches from the top of the display to the bottom. Some users may see multiple lines, while others only notice a single line that remains visible no matter what app is open.
The line is often most noticeable on dark backgrounds but can remain visible at all times.
What Causes a Green Line on an iPhone Screen?
1. OLED Display Damage
One of the most common causes is damage to the OLED display panel. Modern iPhones use advanced display technology that contains millions of tiny pixels. If part of the display circuitry fails, a green line can appear.
This can happen after:
- Dropping the phone
- Heavy impacts
- Pressure applied to the screen
- Internal display component failure
2. Loose or Damaged Display Connections
In some cases, the display connector inside the phone can become damaged after a drop or repair. When the connection between the screen and the logic board is interrupted, display abnormalities such as lines may appear.
3. Water or Liquid Damage
Even if your iPhone appears to work normally after getting wet, moisture can damage internal display components over time. A green line may be one of the first signs of liquid-related screen damage.
4. Software Glitches
Although less common, software issues can occasionally cause temporary display problems. This is especially true after an iOS update or system crash.
How to Tell if It's a Hardware or Software Issue
Try the following steps:
- Restart your iPhone.
- Update to the latest version of iOS.
- Force restart the device.
- Check whether the line appears on the Apple logo during startup.
If the green line remains visible during startup and across all apps, the problem is likely hardware-related.
Can a Green Line Be Fixed?
If the issue is caused by software, a restart or update may resolve it.
However, if the green line is caused by physical display damage or OLED failure, the screen typically needs to be replaced. Unfortunately, the issue rarely disappears on its own once hardware damage has occurred.
Will the Green Line Get Worse?
Sometimes the line remains unchanged for months. In other cases, additional lines may appear, the display may begin flickering, or parts of the touchscreen may stop responding.
Because the problem can worsen over time, it's a good idea to address it sooner rather than later.
Should You Keep Using the Phone?
If the phone is otherwise functioning normally, it's usually safe to continue using it temporarily. However, if the issue resulted from a drop, impact, or liquid exposure, additional display problems could develop later.