Why use full-screen test patterns?
Desktop elements and app windows make subtle defects harder to see. Full-screen solid colors help reveal unusual pixels, uneven areas, and visible steps in gradients.
Testing for pixel defects
Display several bright and dark solid-color screens. Inspect from your normal viewing distance and then more closely. A point that stays dark or lit can indicate a pixel defect, but classification and warranty policies vary by manufacturer.
How to check for banding
A smooth gradient should transition as evenly as your display chain allows. Visible bands can come from the monitor, image settings, color depth, source compression, or other parts of the signal path.
Backlight uniformity on a dark screen
A dark test screen can make uneven illumination easier to notice. Judge it in realistic room lighting because display brightness and ambient light strongly affect what you see.
If the result looks suspicious, reconnect the device and repeat the test. A browser test can reveal a symptom, but confirming it in another app or computer helps narrow down the cause.
Frequently asked questions
Does the test require installation?
No. ACC64 runs in a compatible browser without installing extra software.
Does a failed test always mean hardware is broken?
Not always. Repeat the test, check the connection and system settings, and if possible compare on another device or computer.