Full Black Screen Test for OLED Dead Pixel Check
Free online full black screen test to check for dead pixels, backlight bleed, and light leakage on OLED, LCD, and phone displays. Pure black fullscreen — no install needed.
Click for Fullscreen Black Screen
Best results in a dark room
OLED Dead Pixel Check
Display a pure black screen to reveal stuck-on pixels that appear as tiny bright dots against the dark background.
Backlight Bleed Test
Detect light leakage around edges and corners of LCD and IPS monitors using a full black screen in a dark room.
OLED True Black Test
Verify that your OLED display achieves perfect black levels with zero light emission for true infinite contrast.
All Devices Supported
Works on OLED TVs, gaming monitors, laptops, tablets, and smartphones — iOS and Android.
Why Use a Full Black Screen Test?
A full black screen test is the most effective way to detect dead pixels, backlight bleed, and panel defects. On a pure black background, even the slightest light leakage or stuck pixel becomes immediately visible.
What This Black Screen Test Reveals
Each issue becomes visible on a pure black background
Complete Guide to Full Black Screen Test & OLED Dead Pixel Check
“A pure black screen is the single most revealing test pattern for display defects. Dead pixels, backlight bleed, and light leakage all become instantly visible against true black.”
This free online full black screen test fills your entire display with pure black (RGB 0, 0, 0) so you can perform an OLED dead pixel check, detect backlight bleed on LCD monitors, and verify true black performance on OLED and AMOLED screens — no software installation required.
How to Perform a Full Black Screen Test for Dead Pixel Check
Follow these steps to use our free black screen test for the most accurate results:
- Dim your room lights completely — this test works best in total darkness.
- Click "Enter Fullscreen Black Screen" above to fill your entire display with pure black.
- Look carefully for any bright dots on the black screen — these are dead or stuck pixels.
- Check the edges and corners of your screen for any glowing patches — this indicates backlight bleed.
- Take a photo of any defects you find for warranty claims or return requests.
OLED Dead Pixel Check with Black Screen
Dead pixels on OLED displays appear as tiny bright dots against a pure black background because they fail to turn off completely. Stuck pixels may glow red, green, blue, or white. Our full black screen test makes these defective pixels immediately visible. On OLED and AMOLED screens, true black means zero light emission — any pixel that glows on a black screen is defective.
LCD Backlight Bleed Test with Full Black Screen
Backlight bleeding is a common issue on LCD, IPS, and VA panels where light leaks around the edges or corners of the display. It appears as uneven glowing or clouding on a black screen. Our full black screen test makes backlight bleed easy to identify — simply enter fullscreen mode in a dark room and look for any non-uniform brightness. Minor bleed is normal on most LCDs, but excessive light leakage may qualify for warranty replacement.
OLED vs LCD Black Screen Test Results
OLED displays achieve true black by turning off individual pixels completely, resulting in zero light emission on a black screen. LCD panels rely on a backlight that remains on even when displaying black, which is why backlight bleed and IPS glow are visible. Our black screen test helps you understand the difference — on a quality OLED, the screen should appear completely dark with no visible light. On LCD, some glow is expected but should be minimal.
Important: Test Environment Matters
For the most accurate black screen test results, perform this test in a completely dark room. Any ambient light can make it difficult to spot subtle backlight bleed or faint stuck pixels. Give your eyes 30 seconds to adjust to the darkness before inspecting the screen. Also, make sure your display brightness is set to at least 50% — higher brightness makes defects more visible.
Supported Display Types for Black Screen Testing
This full black screen test works on all major display technologies and devices:
OLED / QD-OLED / AMOLED
Perfect black levels with zero light emission. Any glowing pixel is a defect. Check for dead pixels and burn-in marks.
LCD / IPS / VA
Backlight always active. Check for backlight bleed, IPS glow, and clouding around edges and corners.
Phones & Tablets
Test AMOLED or LCD screens for dead pixels and light leakage on smartphones and tablets.
This free full black screen test runs entirely in your browser with no download or sign-up required. Use it regularly to catch display defects early and document issues for warranty claims.