Display Refresh Rate & Screen Tester – Monitor Hz, Dead Pixels & Color Banding

How Display Refresh Rates (Hz) & Dead Pixel Testing Work

Modern gaming displays and professional creator monitors boast high refresh rates of 120Hz, 144Hz, 165Hz, 240Hz, or 360Hz. However, incorrect operating system display settings, HDMI cable bandwidth limits, or driver configurations frequently lock monitors to standard 60Hz without user awareness.

Key Monitor Tests Performed

• Microsecond Refresh Rate Timing: Uses high-precision requestAnimationFrame and performance.now() timestamps across 120 consecutive hardware frames to compute genuine refresh frequency and frame pacing jitter.
• Dead & Stuck Pixel Examination: Launches an interactive fullscreen test canvas cycling pure Black, White, Red, Green, Blue, Magenta, Yellow, and Cyan backgrounds to identify dead (black), hot (bright white), or stuck (colored sub-pixel) defects.
• 8-Bit vs. 10-Bit Color Banding Ramp: Evaluates display panel bit depth and gamma calibration curves by rendering 256-shade continuous grayscale and RGB ramps.
• Motion Ghosting & Response Time Tracker: Simulates fast-moving high-contrast motion across screen tracks to evaluate panel response time (GTG) and overdrive artifacting.

Frequently asked questions

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