Screen Flicker Test — Check Display PWM & Inversion
Inspect LCD panel voltage inversion balancing and temporal luminance stability using controlled, safety-conscious test patterns.
This test produces controlled, low-frequency temporal luminance alternations to help inspect display pulse-width modulation (PWM) and inversion flicker. Stop immediately if you experience eye strain, headache, dizziness, or discomfort.
Display Inversion & Flicker Check
Renders controlled alternating mid-gray inversion patterns to check LCD voltage balancing and high-frequency flicker.
Safety & Technical Limitations
This utility is strictly an inspection aid and does not constitute a medical diagnosis. High-frequency flicker-free (DC dimming) certification requires physical laboratory oscilloscope optical probes.
Frequently Asked Questions
What causes screen flicker?
Display flicker is commonly caused by low-frequency Pulse-Width Modulation (PWM) dimming in LED backlights, LCD voltage inversion imbalance, or fluctuating AC power supplies.
Can this browser test measure exact hardware PWM frequency (e.g. 960Hz)?
No. Modern operating systems and browsers cap frame rendering to display refresh rates (e.g. 60–240Hz). Physical microsecond PWM dimming frequencies (often 500Hz–20,000Hz) require specialized optical photodiode sensors or high-speed camera slow-motion video.
How do I test for PWM flicker with a smartphone?
Point your smartphone camera at your monitor in Pro / Manual video mode with shutter speed set to 1/1000s or faster. If dark horizontal scrolling scan lines appear on camera, your monitor uses PWM backlight dimming.
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