Screen & Dead Pixel Test
Pure client-side real-time screen analysis tool for physical resolution, refresh rate, HDR dynamic range, and full-screen pixel inspection.
Solid Color Inspection
Dead pixel / stuck pixel / screen uniformity check
Gradient & Grayscale Smoothness
Examine color gradient smoothness, color banding, black crush, and highlight clipping
Motion Blur & Response Time
Test true refresh rate, frame skipping, panel response time, and motion ghosting
HDR Peak Brightness
Test peak brightness, sustained duration, and Automatic Brightness Limiter (ABL) on OLED and Mini-LED across 1% to 100% window sizes.
Screen Testing FAQ & Guide
What are bright, dark, and dead pixels?
LCD and OLED pixels consist of red, green, and blue subpixels. A permanently lit subpixel is a bright pixel, while an unlit one is a dark pixel, typically caused by panel manufacturing defects.
Why is the detected resolution different from nominal specs?
Operating systems often apply display scaling by default. This tool accurately restores the true physical panel resolution using the Device Pixel Ratio (DPR).
What is grayscale patch testing for?
10% to 90% grayscales are primarily used to inspect backlight uniformity, dark-level noise, and OLED dirty screen effect (DSE / Mura).
What is Color Banding?
When panel bit depth is insufficient (e.g. 6-bit + FRC) or color quantization is constrained, continuous gradients display harsh banding steps. High bit-depth panels (native 8-bit / 10-bit) deliver smoother transitions.
How to trigger maximum peak brightness on mobile devices?
Peak brightness on mobile devices is usually tied to High Brightness Mode (HBM). Manually maximizing the brightness slider only reaches standard limits. Enable Auto-Brightness and shine a flashlight directly onto the ambient light sensor at the top to simulate bright outdoor sunlight and trigger maximum brightness.
What are HDR Peak Brightness and ABL?
OLED and Mini-LED panels employ an Automatic Brightness Limiter (ABL) to protect hardware and manage power draw. Small windows (1%~10% APL) achieve extreme peak brightness, while full-screen white (100% APL) actively reduces power output. Smaller windows make it easier to observe true hardware peak limits.