Blue light (blue light) emitted from smartphone screens can cause eye fatigue and affect sleep quality.
1. What is blue light?
Blue light, which is a short-wavelength, high-energy light, is primarily emitted from digital device screens. Long-term exposure can lead to eye fatigue, sleep disturbance, and even damage to retinal cells.
2. Key Effects of Blue Light Blocking
Improving sleep quality: Reduce melatonin secretion to induce deep sleep
Ease eye fatigue: Reduce burden when using the screen for long periods of time
Protect Your Eyesight: Maintain Long-term Eye Health by Reducing Reaction to the Retinas
3. How to set up by operating system (OS)
3.1 Android
Settings > Display > Eye Protection Mode or Blue Light Filter
Set the time schedule after changing to Enable (e.g. 9 p.m. to 7 a.m.)
Adjust the filter strength (color temperature) to set it to an eye-friendly level
Additional Options (By Manufacturer)
Samsung: Settings > Display > Eye Protection Mode (Adaptable/Reservation Time Selection)
LG: Blue light blocking → Color temperature slider provided
Xiaomi (MIUI): Read mode → Manual or time zone setting
Huawei: Provides eye protection mode + screen color control function at the same time
3.2 iPhone (iOS)
Settings > Display and Brightness > Night Shift
Schedule a time: ‘From sunset to sunrise’ or custom time settings
Move the color temperature control slider to the right to maintain a warm color
3.3 Is it possible on Windows, macOS?
The blue light blocking function is also available on desktops and laptops.
Windows: Settings > System > Display > Use Night Mode
macOS: System Settings > Display > Night Shift
4. Advanced blocking methods using external apps
3rd Party App Recommendation
Twilight (Android): Sunset/Sunrise Automatic Recognition, Color Temperature & Brightness Detail Adjustment
f.lux (iOS/Android/PC): Automatic color temperature setting by device, scenario by working hours
Blue Light Filter – Eye Care (Android): Quick transition to widget/alert
Bluelight Filter Pro (iOS): personalized filters with automatic switching between apps
5. Additional Tips for Vision Protection
20-20-20 rule: After 20 minutes of use, look 20 feet away for 20 seconds
Setting Dark Mode by App: Minimize glare
Automatic screen brightness: Enable automatic adjustment according to indoor and outdoor environments
Blue light film attachment: can be blocked by physical protective film
Eye Rest Habit: At least 5 minutes of rest after 1 hour of smartphone use is recommended
6. Frequently Asked Questions (FAQ)
Q: Is it okay if the screen turns yellow?
A: Yes, the blue light blocking filter protects your eyes through warm colors (yellow). It works normally.
Q: Is there no problem if I leave it on all day?
A: No problem. Rather, it is recommended to leave it on at all times for eye health.
Q: Each app has different filter effects, why is that?
A: Some apps (games/video) restrict the application of blue light filters for color accuracy.
The Blue Light Blocking feature is a very useful tool for protecting the user’s eye health and sleep quality. The combination of basic functionality by operating system and external app assistance provides more effective protection. Start setting up today!