Smartphone proximity sensors are hardware components designed to detect when a device is held against a user’s ear during a call, automatically disabling the touchscreen to prevent accidental inputs. On modern devices with edge-to-edge screens, this sensor often sits beneath the display, occasionally appearing as a faint flashing dot. This behavior is a standard functional byproduct of the sensor’s infrared light emission and does not indicate a hardware defect or security concern.
Why do you see a flashing dot on your screen?
The visible light is a result of the sensor’s underlying technology. According to official Samsung documentation, a proximity sensor utilizes a light-emitting component and a light-receiving component. The device fires infrared rays to measure the distance between the phone and external objects. On older smartphone models, this hardware was typically hidden within the top bezel. However, modern designs—such as the Infinity display architecture found on Samsung Galaxy devices—often place these sensors directly behind the screen. When the sensor is active, the infrared light may appear as a faint, blinking dot to the user.
Can you disable the proximity sensor?
You cannot turn off the proximity sensor on Samsung Galaxy smartphones released after the Galaxy S5 series. The sensor is an essential safety feature for call management; it ensures the screen remains locked while the phone is pressed against your ear. If you use a Bluetooth headset or the phone’s speakerphone mode during a call, the device will deactivate the proximity sensor, which stops the flashing light and keeps the display active. This design choice is intentional, as the sensor serves a specific, non-customizable utility in preventing accidental screen interaction.
How to troubleshoot sensor malfunctions
If your screen fails to wake up after a call or stays dark when it should be active, the proximity sensor may be malfunctioning. Samsung advises that external factors, such as hair, static electricity, or ill-fitting screen protectors, can obstruct the sensor’s infrared path.
To address these issues, follow these diagnostic steps:
- Clean the hardware: Use a soft cloth to wipe the top portion of your display to remove debris or oils that might be blocking the sensor.
- Remove accessories: If you are using a screen protector or film, remove it to see if the sensor functionality returns to normal.
- Run diagnostics: Open the Samsung Members app and utilize the proximity recognition diagnostic test to verify if the component is physically operational.
- Adjust settings: Enable the “Double tap to turn on screen” feature under Settings > Advanced features > Motions and gestures as a workaround for waking the display.
If these steps do not resolve the behavior, the issue may require professional hardware inspection at an authorized repair center.
Summary of Proximity Sensor Behavior
| Feature | Status |
|---|---|
| Visible Flashing | Normal operation for under-display sensors |
| User Control | Cannot be disabled on modern Galaxy devices |
| Primary Function | Prevents accidental touches during calls |
| Common Fix | Cleaning the top display or removing screen film |
Proximity sensors remain a foundational piece of mobile hardware. While the visual indicator on modern displays may appear unusual, it confirms that your device is actively monitoring its environment to provide a seamless calling experience.