Screen Flicker Test

Check your display for visible flickering and brightness fluctuations using on-screen test patterns.

Display Diagnostic Tool
Adjust brightness, point phone camera at screen — look for stripes
Flicker Detection Brightness 63%

Test Mode

Brightness 63%

PWM Frequency Reference

<250HzHigh risk
250–500HzMedium risk
500Hz–2kHzLow risk
>2kHz / DCNear imperceptible
← Longer bar = more flicker

Detection Methods

Phone Camera
Simple & intuitive
Recommended
Pen Wave Test
No equipment needed
Quick
Oscilloscope + Photo
Precise measurement
Professional
Check Review Data
rtings.com
Comprehensive

Assessment Guide

No Flicker Camera: no stripes · Pen: no doubling → likely DC dimming
Has Flicker Camera: stripes visible · worse at low brightness → possible PWM
Screen flicker can appear as rapid brightness changes, visible flashing, or unstable-looking screen content. This tool displays controlled patterns so you can observe your display directly, with your eyes or a phone camera. It cannot measure every type of flicker and cannot electrically measure PWM frequency or your monitor's physical brightness — the reference chart and detection methods above are general background information, not a live measurement from this page.

Guided Workflow

Step 1 of 6
Prepare your display
Set your monitor to your normal viewing brightness and dim the room slightly if possible. This makes flicker easier to notice.

What do you observe?

Test Summary

No results recorded yet. Record your observations, then save a summary.

This tool helps you visually observe possible flicker and brightness fluctuation on your display, including with the help of a phone camera. It is a general observation aid, not a hardware measurement device or medical tool. It cannot detect every type of high-frequency flicker, cannot electrically measure PWM frequency, and does not diagnose eye strain, headaches, or any other health condition. Stop immediately if you feel discomfort.