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Detect display backlight pulse-width modulation (PWM) frequency, duty cycle, and optical camera strobe patterns.
Display manufacturers control brightness via either DC Dimming (lowering voltage continuously) or PWM (Pulse-Width Modulation) (flashing the backlight ON/OFF thousands of times per second). Low PWM frequencies (<240Hz) cause micro-strobe flicker leading to eye strain and migraines.
Clean your monitor surface, disable ambient light sensors, and set your display to native resolution and refresh rate.
Enter full-screen mode (F11) and use the diagnostic suite controls to progress through the test patterns.
Observe anomalies from different viewing angles in a dark room. Reference our testing guides to interpret your results.
Superior color accuracy and viewing angles. Used in reference monitors. Prone to minor 'IPS Glow' in dark environments.
High refresh rates and good response times for gaming, but lower static contrast ratios compared to VA.
Excellent deep blacks and high contrast (3000:1+). Often used in curved displays. Can exhibit 'black smearing' in fast motion.
Self-lit pixels deliver true black, near-instant response times, and infinite contrast. Subject to Auto Brightness Limiting (ABL).
Our testing methodology aligns with VESA, SMPTE, and ISO standards for display metrology. This diagnostic tool utilizes raw web APIs (Canvas, WebGL, CSS Color Level 4) to ensure bit-perfect rendering, bypassing OS-level compression and scaling where possible.
Everything you need to know about this diagnostic instrument, calibration procedures, and display technical standards.
SHA-256 SIGNED CALIBRATION RECEIPT
100% Anonymized & Signed: Submitting publishes your SHA-256 receipt, refresh telemetry, and defect counts to aid buyer panel lot verification. Zero personal data collected.