Panel Quality
Black Screen Test
A pure pitch-black screen in fullscreen mode. Inspect your monitor for backlight bleed, corner IPS glow, stuck subpixels, or OLED zero-luminance contrast.
Display Active
Fullscreen Black Screen & Uniformity Inspector
Press 'F' for complete darkness. Inspect all four corners and bezel edges for white or yellow light bleeding.
Shortcuts:Space NextF FullscreenEsc Exit
💡Softbox Light
Click to Enter Distraction-Free Fullscreen
Auto-hides in 3s · Press Space next color · H hideAuto-hides in 3s · Tap to cycle colors
Canvas:#FFFFFF
Mode:Solid Color
Backlight Bleed Detection
Dim your room lights completely. Look along the edges and corners of your screen. If light spills inward unevenly from the frame, your panel exhibits backlight bleed.
Stuck Pixel Spotting
Stuck subpixels stay lit even when instructed to show black. On a black screen, stuck subpixels jump out as tiny red, green, blue, or white specks.
OLED True Black Verification
On OLED and QD-OLED displays, a black screen shuts down individual pixels entirely (0.000 nits), creating infinite contrast with zero glow.