Use our free fullscreen red screen online for stuck pixel testing, color calibration, screen uniformity checking, and display testing. Perfect for identifying red sub-pixel defects on monitors, laptops, TVs, and phones.
Red screen is essential for testing the red sub-pixels in your display. Every pixel contains three sub-pixels: red, green, and blue. When you display a pure red screen, only the red sub-pixels should light up, making it easy to spot defects.
Stuck pixels that always display red become invisible on red screens. However, pixels stuck in other colors (green, blue, white, black) show up clearly, helping you identify exactly which sub-pixels are malfunctioning.
Red screen helps calibrate your display's color accuracy. Professional photographers and designers use solid color screens to ensure their monitors display colors correctly before color-critical work.
Check if your red channel displays evenly across the entire screen. Look for brightness variations, tinting, or patches that could indicate manufacturing defects or aging display components.
Manufacturers use solid color screens during quality control. You can do the same to verify your display meets professional standards before accepting delivery of expensive monitors or TVs.
Testing your display with red screen is straightforward but requires attention to detail. Here's how professionals do it:
For comprehensive pixel testing, you should test with all primary colors. Red screen finds green and blue stuck pixels, green screen finds red and blue stuck pixels, and blue screen finds red and green stuck pixels. Together, these tests provide complete coverage.
Every pixel on your screen contains three separate sub-pixels: one red, one green, and one blue. By lighting up different combinations of these sub-pixels at various intensities, your display can create millions of colors.
When you display a pure red screen, only the red sub-pixels should illuminate. If you see any green, blue, white, or black dots, those indicate malfunctioning pixels. White dots mean all three sub-pixels are stuck on, black dots mean all are stuck off, and colored dots indicate specific sub-pixel failures.