Online Screen Test & Dead Pixel Detection
Inspect your monitor in fullscreen: RGB primary colors, dead/stuck pixel detection, and solid backgrounds for photographic evidence.
The guided test will sequentially project 5 pure color screens for 6 seconds each to help you visually detect dead pixels, light bleed or panel imperfections. The interface auto-hides so it's never mistaken for a real defect; move the mouse or tap the screen to reveal controls.
Color sequence — RGB dead pixel test
5 screens · 6 s each · interface auto-hides
Display information
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What is the Screen Test and How Does It Work?
What problem does it solve?
Allows thorough inspection of 100% of your monitor's surface area for dead pixels, stuck subpixels, backlight bleeding, and image retention.
Guided Mode & Solid Backgrounds
Guided mode cycles through 5 primary colors (Red, Green, Blue, White, Black). Solid mode locks clean flat colors to take photographic evidence for warranty claims.
Self-Hiding Clean Canvas
During fullscreen testing, all UI overlays automatically fade away after 1.8 seconds of inactivity so no controls obscure panel bezels.
Quick Usage Guide
- Limpia suavemente la superficie de tu monitor con un paño de microfibra para no confundir motas de polvo con píxeles dañados.
- Pulsa "Iniciar Test" y acepta el modo pantalla completa.
- Observa detenidamente cada color plano durante 6 segundos e indica si observas anomalías (puedes salir en cualquier momento con la tecla ESC).
Common Monitor Issues & Step-by-Step Fixes
Distinguish between stuck pixels, dead subpixels, backlight bleed, and display signal bottlenecks.
Issue 1: Stuck Pixel (Persistent bright red, green, or blue dot)
Unlike dead pixels, stuck pixels still receive current. Run rapid RGB color cycling animations for 20-30 minutes to unstick frozen liquid crystal molecules.
Power down the screen. Using a microfiber cloth over a blunt stylus or fingertip, apply gentle pinpoint pressure on the stuck pixel, power on the monitor, then release.
Issue 2: Dead Pixel (Permanent black subpixel defect)
A pure black pixel indicates physical TFT transistor circuit failure. Use Mode 2 (Solid White) in this tool to photograph the flaw for warranty replacement RMA.
Check ISO 13406-2 / ISO 9241-307 manufacturer policy. Class I panels guarantee 0 dead pixels, while commercial Class II panels require 3-5 defective pixels per million to qualify for RMA.
Issue 3: Backlight bleeding or IPS Glow in corners
Lower monitor brightness to 40-50% and mount bias backlighting behind the display to diminish perceived IPS glow contrast in dark rooms.
Backlight bleed stems from uneven bezel mechanical clamping. If mounted on a VESA arm, loosen mounting screws by 1/4 turn to relieve chassis corner torque on the light diffuser.
Issue 4: Display flickering or intermittent horizontal lines
Replace low-grade HDMI/DisplayPort cables with certified shielded cables and ensure connection directly into the discrete GPU rather than motherboard ports.
In GPU control panels (NVIDIA/AMD), lock native refresh rate (e.g. 144Hz/165Hz), disable windowed G-Sync/FreeSync flicker, and update monitor scaler firmware.
Did You Know? Amazing Facts on Displays & Pixels
Over 6 million tiny lights in a 1080p display
A 1080p display contains 2,073,600 pixels. Each pixel houses 3 discrete RGB subpixels, meaning you are looking at 6,220,800 simultaneous micro-transistors on glass.
Why OLED delivers true infinite contrast black
Traditional IPS/LCD panels use backlights attempting to be blocked by crystals. In OLED, each organic subpixel emits its own light; to display black, it powers off to zero lux.
144 Hz vs 60 Hz: Milliseconds that change perception
At 60 Hz, a frame renders every 16.6 ms. At 144 Hz, this drops to 6.94 ms, and at 240 Hz down to 4.16 ms, dramatically reducing eye strain and motion ghosting.
Screen Burn-in: The origin of Screensavers
Animated screensavers were invented in the 1980s for CRT monitors. Static images caused phosphorus degradation, permanently etching ghost silhouettes into glass.