Free online full black screen test tool for OLED dead-pixel check, stuck pixel detection, backlight bleeding test, and screen uniformity verification. Display a pure black screen to identify display defects on OLED, AMOLED, LCD, and LED screens. Works on all devices.
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Click to enter fullscreen mode and display a pure full black screen for OLED dead-pixel check
A full black screen test displays a completely pure black image across your entire screen. This is the most effective method for performing an OLED dead-pixel check, as any defective pixels will appear as bright dots against the dark background. On OLED and AMOLED displays, each pixel produces its own light and can turn off completely for true blacks, making dead pixels and stuck pixels highly visible during a full black screen test.
Our free full black screen test tool is specifically designed for OLED dead-pixel check and backlight bleeding detection. Unlike multi-color tests, a pure full black screen provides the highest contrast for identifying pixel defects. Whether you're testing a new OLED TV, smartphone, laptop monitor, or tablet, this dark screen test instantly reveals any display imperfections that affect your viewing experience.
Click the 'Start Full Black Screen Test' button to enter fullscreen mode with a pure black display for OLED dead-pixel check.
Carefully examine the full black screen for any bright spots, colored dots, or light patches. These indicate dead or stuck pixels on your OLED display.
Pay special attention to screen edges and corners where backlight bleeding commonly occurs on LCD screens and uniformity issues appear.
Note the location and severity of any defects found during the OLED dead-pixel check. Press ESC or click to exit the full black screen test.
Appear as bright white or colored dots that don't turn off on the full black screen. These are pixels that have permanently failed on your OLED display.
Show as red, green, or blue dots on the dark screen. These pixels are stuck in an 'on' state and may be fixable with pixel-fixing methods.
Visible as light patches around edges or corners on LCD and LED screens during the full black screen test. Caused by uneven backlight distribution.
Uneven brightness or color across the display panel. More noticeable on the full black screen and dark backgrounds.
OLED displays should show a perfectly uniform full black screen since each pixel turns off independently. Any bright dots during the OLED dead-pixel check indicate defective pixels. OLED screens achieve true infinite contrast ratio with perfect blacks.
LCD screens use a constant backlight, so the full black screen may appear dark gray rather than pure black. Some backlight bleeding is normal, but excessive light patches indicate a quality issue with the display panel.
A full black screen provides the highest possible contrast for detecting pixel defects. On OLED displays, working pixels turn completely off to produce true black, so any dead or stuck pixels appear as bright dots against the dark background. This makes the full black screen test the most effective method for OLED dead-pixel check on any device.
A full black screen test displays only pure black across the entire screen without any UI elements or controls visible, maximizing the contrast for pixel defect detection. Regular black screen tests may include multiple color options or visible controls. The full black screen test is specifically optimized for OLED dead-pixel check with zero distractions.
While the full black screen test is primarily designed for OLED dead-pixel check, it can also reveal some burn-in patterns. However, burn-in is typically more visible on gray or mid-tone backgrounds. For comprehensive burn-in detection, we recommend combining the full black screen test with our OLED gray test tool for a complete display health assessment.
Yes, the full black screen test is completely safe for OLED displays. In fact, displaying a full black screen puts less stress on OLED pixels since they turn off completely. Unlike static bright images that can contribute to burn-in, a full black screen gives your OLED pixels a rest, making this test both safe and beneficial for your display.
Ready to perform an OLED dead-pixel check on your display? Start the full black screen test now and inspect your screen for defects.