How to Test a Screen: Complete 5-Step Panel Inspection Protocol

Step 1: Clean the Glass Surface & Ambient Lighting Setup

Before launching any software, power down the monitor and inspect the physical glass under a soft flashlight. A single speck of lint or dried droplet can easily mimic a dead subpixel.

• Use a clean, dry microfiber cloth. Do NOT use paper towels or harsh ammonia-based window sprays.
• Set ambient room lighting to a comfortable, moderate level without direct glare on the screen.
• Allow the display to warm up for 10–15 minutes to reach stable operational temperature.

Step 2: Inspect Solid Primary Colors for Pixel Defects

Launch our Dead Pixel Test in full screen. Systematically cycle through the primary test slides:

• Pure White (255, 255, 255): Reveals true black dead pixels where all 3 subpixels are unpowered.
• Pure Black (0, 0, 0): Reveals stuck bright pixels (red, green, blue) that refuse to turn off.
• Pure Red, Green, Blue: Isolates individual subpixel defects. If a pixel appears black only on Green, the green subpixel transistor is dead.

Step 3: Dark-Room Backlight Bleed & IPS Glow Audit

Turn off all room lights so the room is completely dark. Launch the Backlight Bleed Test with brightness set to 100%:

• Backlight Bleed (Defect): Visible yellow or white light pooling sharply from bezel edges. Does NOT change shape when you move your head.
• IPS Glow (Normal Behavior): Uniform silvery sheen across corners that shifts and disappears as you change viewing angles.

Step 4: Grayscale Gradient & Dirty Screen Effect (DSE)

Launch our Grayscale Gradient Test:

• Banding Check: Look for smooth transitions from 0% pure black to 100% pure white without harsh stepped vertical bars.
• DSE & Uniformity: On 25% and 50% medium gray slides, verify that the screen brightness is uniform across all four quadrants without murky clouds.

Step 5: Verify Native Resolution, Scaling & Refresh Rate

Ensure your graphics card and operating system are transmitting at the panel's maximum rated performance:

• Open the Screen Resolution Test to verify native 1:1 pixel mapping and device pixel ratio (DPR).
• Run the Refresh Rate Test to confirm 144Hz, 240Hz, or 360Hz frame pacing via `requestAnimationFrame`.

Frequently Asked Questions