The Dead Pixel Screen Tester launches targeted solid full-screen color patterns to help you inspect monitors, laptop screens, and mobile displays for defective pixels and subpixels.

### Direct Pattern Selector Cards Rather than cycling through an automated slideshow, this tool provides individual cards for each primary test state so you can jump directly to the pattern you need: - **Pure White (#FFFFFF)**: Illuminates all subpixels simultaneously. Ideal for spotting dead pixels (which remain permanently black or dark) and dirt beneath screen glass. - **Pure Black (#000000)**: Deactivates all subpixels. Crucial for detecting hot pixels (permanently illuminated white), backlight bleeding along bezel edges on IPS/VA panels, and OLED burn-in retention. - **Pure Red (#FF0000)**: Activates only red subpixels to reveal defective or stuck green/blue subpixels. - **Pure Green (#00FF00)**: Activates only green subpixels, the channel to which human eyesight has the greatest luminance sensitivity. - **Pure Blue (#0000FF)**: Activates only blue subpixels to uncover weak or dead blue diodes.

### Inspection Procedure 1. Clean your display surface with a microfiber cloth to remove dust particles that can mimic dead pixels. 2. Click any of the solid color cards to enter distraction-free full-screen mode. 3. Slowly inspect the entire display grid from a normal viewing distance, then closer if evaluating high-DPI panels (such as 4K or Retina displays). 4. Click anywhere or press the Exit Fullscreen button to return to the selector menu.

### Execution & Privacy Full-screen patterns are rendered entirely through browser CSS and standard Fullscreen DOM APIs. No camera feeds, hardware serials, or usage logs are collected.