Output
Steady colors, steps or fine-line patterns
UserBenchmark / All Tools / PWM Flicker Camera Guide
Display
PWM Flicker Camera Guide
Use a steady white field and an external slow-motion camera to inspect backlight bands.
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PWM Flicker Camera Guide · At a glance
Quick answer: Use a steady white field and an external slow-motion camera to inspect backlight bands. Recorded bands can result from PWM, rolling shutter or refresh interaction.
PWM Flicker Camera Guide
The test loads when you open it. Device access is requested only after you choose to start.
Detailed guide
How to use this tool
- Use the steady white field and an external slow-motion camera.
- Compare several brightness levels without changing the source pattern.
Input
Manual visual inspection
Browser requirement
Native resolution; fullscreen support
Processing
Runs on your device; no tool-result upload
How it works and what the result means
These are visual inspection patterns. The page cannot read individual panel pixels, measure nits or contrast ratio, diagnose a panel automatically, or repair dead pixels.
Reading the result
Recorded bands can result from PWM, rolling shutter or refresh interaction. A video alone does not supply a calibrated PWM frequency.
Worked example and assumptions
Steady white field for an external camera
Record at several slow-motion shutter settings and brightness levels. Bands can result from rolling shutter and refresh interaction as well as PWM; the page does not measure PWM frequency.
Record at several slow-motion shutter settings and brightness levels. Bands can result from rolling shutter and refresh interaction as well as PWM; the page does not measure PWM frequency.
What to check next
Keep shutter settings documented and compare repeated captures. A different camera mode can change the apparent bands.
Use native screen resolution and 100% browser zoom for fine patterns. Disable adaptive brightness for comparisons. PWM inspection needs an external camera; banding can also be a camera artifact.
Frequently asked questions
Can a website measure backlight PWM frequency?
No. It cannot sense emitted light. Reliable frequency measurement needs suitable optical hardware or a validated camera method.
How do I start the PWM Flicker Camera Guide?
Choose a pattern and open fullscreen. Inspect the entire panel, then click to cycle patterns. Press Escape to leave fullscreen.
Does this tool require a download or an account?
No. Open the interactive tool above in a modern browser. The instructions and explanations are available even with JavaScript disabled; running a test needs JavaScript.
Why can two attempts give different results?
Power settings, background tasks, browser scheduling, operating-system input processing and device settings affect measurements. Compare repeated attempts with identical settings rather than the single highest score.