Pure black screen for testing

On a computer, which color scheme is easier on your eyes: light text / dark background or dark text / light background? - Quora

Mr T

Audiology Pure-Tone Testing: Overview, Indications, Contraindications

Black level - Lagom LCD test

Colour test screen

Dark Mode: How Users Think About It and Issues to Avoid

RESOLVED] Game just shows a black screen - Game Design Support - Developer Forum

Monitor test

Black color for test, screen, HD wallpaper

Black Uniformity Test

Black screen for Backlight Bleeding 1 hour 1080p