Black Screen
Display a true black screen (#000000) — also known as a pure black or black color screen. One click to enter full-screen mode for pixel tests, bleed checks, and focus adjustments.
Specific Screen Defect Tests
Why Use a Full Black Screen?
Stuck/Bright Pixel Detection:
Use the black screen and then run the Dead Pixel Test to check for all color variations.
OLED/AMOLED Power Saving:
On OLED and AMOLED displays, a full black screen turns the individual pixels off, which can greatly reduce power usage and help extend battery life.
Identify Screen Bleed (LCDs):
A full black screen is ideal for detecting backlight bleed on LCD or LED displays, making it easier to spot light leakage along the edges or in the corners.
Maximize Focus and Reduce Distractions:
A pure black screen removes visual noise, helping you stay concentrated or offering a clean, minimal backdrop..
Effective Dust Spotting:
Dust and small particles stand out clearly against a dark background, allowing for more accurate and thorough screen cleaning.
Dark Mode Environment Testing:
Useful for developers and designers to preview applications or websites in a true dark setting, evaluating contrast and overall readability.
Backlight Bleed Test
For LCD/IPS monitors, uneven light leaking from the edges is a common defect. A pitch-black screen in a dark room is the only way to inspect the severity of backlight bleeding or "clouding".
Stuck Pixel Check
Unlike dead pixels (which are black), Stuck Pixels are permanently lit red, green, or blue dots. They shine brightly against a dark background, making them easy to spot and identify.
Benefits of screentester.org’s Black Screen Tool
- Instant Access: Works directly in your browser with no downloads or installations required.
- True Full-Screen Mode: Uses the entire display area (behavior may vary depending on the system).
- Works on All Devices: Built with a fully responsive layout that adapts to any screen size.
- User-Friendly Interface: Clean and intuitive design for seamless navigation.
How to Get a Full Black Screen?
- Click the Button: Hit the "Launch Full Black Screen" button above.
- Allow Fullscreen: Your browser will expand to cover the entire display (including the taskbar).
- Inspect: Dim your room lights and check for light leakage or bright dots.
- Exit: Simply click anywhere, press ESC, or swipe back on mobile.
Advanced Diagnostics: IPS Glow vs. Bleed
Many users confuse "IPS Glow" with defect leakage. Use our black screen to tell the difference:
IPS Glow (Normal)
A faint, bluish/silvery glow visible from an angle. If you move your head or change the viewing angle, the glow changes intensity or position. This is a normal characteristic of IPS panels.
Backlight Bleed (Defect)
Light leaking from specific spots (usually corners). The leakage clearly stays in the same place even when you move your head. This indicates a physical assembly issue.
OLED Power Saving & Utilities
Beyond testing, a black screen is a versatile utility tool:
- OLED/AMOLED Battery Saver On OLED screens, black pixels are completely turned OFF. Using a full black screen consumes near-zero energy, helping to cool down your device or charge faster.
- Focus & Digital Detox Turn your second monitor black to eliminate distractions while working on your primary screen. It creates a "void" that helps reduce visual clutter.
- Mirror Mode On glossy screens (like MacBooks), a full black screen acts as a temporary mirror for a quick check-up.
Technical Insights: True Black (#000000)
Not all "black" is created equal.
- LCD Monitors: A black screen works by blocking the backlight with liquid crystals. It is never truly "off," so you may see a faint dark grey glow in a dark room.
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OLED/Mini-LED: These technologies can dim or turn off individual pixels. Our tool renders Hex Code
#000000, allowing these displays to achieve infinite contrast and "True Black."
Black Screen FAQs
Is this really "pure" black?
Yes. We render the color code #000000. On OLED screens, this means the pixels turn off completely. On LCDs, it will be as dark as your backlight allows.
How do I test for dead pixels (black dots)?
Dead pixels are black, so they are invisible on a black screen. You must use our White Screen Test to find them.
My screen turns off completely / I can't see bleed?
Modern TVs and Mini-LED monitors often use "Local Dimming," which turns off the backlight entirely on a pure black screen. To test for bleed properly, try Dark Grey Screen to force the backlight on.
Is this All Black Screen compatible with both my phone and computer?
Yes, it is fully responsive, ensuring an optimal All Black Screen experience across all modern devices and browsers, including iPhones, Android phones, tablets, and desktops.
Why do I see dust so clearly?
Light-colored dust particles reflect monitor light. Against a pure black background, this contrast is maximized, making it an excellent mode for cleaning your screen.
How do I exit the black screen?
Simply click anywhere on the screen, press the ESC key on your keyboard, or swipe "Back" if you are on a mobile device.