WARNING: PHOTOSENSITIVE SEIZURE & FLICKER HAZARD

A small percentage of individuals may experience epileptic seizures or photosensitive reactions when exposed to flashing lights, high-contrast strobing, or rapidly moving visual patterns. In compliance with WCAG 2.1 Success Criterion 2.3.1 (Three Flashes or Below Threshold), Display Test Online limits default strobing animations. However, dynamic visual tests inherently involve rapid refresh intervals.

Discontinue use immediately and consult a physician if you experience dizziness, altered vision, twitching, loss of awareness, or disorientation while running tests.

UNIVERSAL DISPLAY & TOUCH DIAGNOSTIC SUITE

Online Fullscreen Screen Test & Display Diagnostic Instrument

Instantly evaluate computer monitors, laptop screens, smartphones, tablets, and Smart TVs. Test for dead pixels, low-gray OLED banding, color space calibration, subpixel text fringing, and touch digitizer accuracy in true fullscreen mode.

UNIVERSAL SCREEN TEST ENGINEWAKE LOCK: ACTIVE

RES: --x--DPR: --x-- HZ

RGB / QD-OLED / WOLED SUBPIXEL TEXT CLEAR-TYPE RETICLE

The quick brown fox jumps over the lazy dog. 0123456789

RED SUBPIXEL TEXT LINE — ClearType Fringing Inspection

GREEN SUBPIXEL TEXT LINE — High Luminance Reticle

BLUE SUBPIXEL TEXT LINE — Subpixel Geometry Check

[ 1. SOLID WHITE ]

Click to Enter Fullscreen Test

Use Left/Right arrow keys or click to cycle patterns in fullscreen. Press ESC to return.

PRESS ESC TO EXIT | F FOR FULLSCREEN

16 Engineered Diagnostic PatternsUSE ARROW KEYS OR NUMBERS 0-9 TO CYCLE

Kelvin Temp Color Wheel:6500K

Custom Hex Color Picker:

1. Pixel & Subpixel Defect Scan

Cycles primary RGB, pure white, and OLED black patterns. Detects unlit dead pixels, stuck subpixels, and subpixel gate shorts before retailer RMA return windows close.

2. OLED 5% & 10% Gray Banding

Evaluates IEC 62341-6-2 low-luminance near-black gray responses. Uncovers dark-gray vertical banding, dirty screen effect (DSE), and organic subpixel wear on WOLED and QD-OLED panels.

3. TV Remote & Gamepad Loop

Native W3C Gamepad API engine enables seamless TV remote, PlayStation, and Xbox controller D-Pad navigation for wall-mounted Smart TVs and couch setups.

DIAGNOSTIC PROTOCOL

How To Run This Display Test (01, 02, 03)

Preparation

Clean your monitor surface, disable ambient light sensors, and set your display to native resolution and refresh rate.

Execution

Enter full-screen mode (F11) and use the diagnostic suite controls to progress through the test patterns.

Evaluation

Observe anomalies from different viewing angles in a dark room. Reference our testing guides to interpret your results.

HARDWARE ARCHITECTURE

Panel Technology Breakdown

Professional IPS (In-Plane Switching)

Superior color accuracy and viewing angles. Used in reference monitors. Prone to minor 'IPS Glow' in dark environments.

Consumer IPS (Fast IPS / Nano IPS)

High refresh rates and good response times for gaming, but lower static contrast ratios compared to VA.

VA Panel (Vertical Alignment)

Excellent deep blacks and high contrast (3000:1+). Often used in curved displays. Can exhibit 'black smearing' in fast motion.

OLED (Organic LED) & QD-OLED

Self-lit pixels deliver true black, near-instant response times, and infinite contrast. Subject to Auto Brightness Limiting (ABL).

Technical FAQs & Helpful Content

Frequently Asked Questions

Everything you need to know about this diagnostic instrument, calibration procedures, and display technical standards.

01.What is an online monitor screen test?

An online screen test is a free, web-native diagnostic instrument that evaluates computer displays, laptops, smartphones, tablets, and Smart TVs for physical hardware defects, including dead pixels, stuck subpixels, OLED 5%/10% gray banding, subpixel text anti-aliasing, color depth limits, and touch digitizer accuracy.

02.How do I test my screen for dead and stuck pixels?

Enter fullscreen mode on our Universal Screen Test deck and cycle through solid primary backgrounds (White, Black, Red, Green, Blue). Inspect your screen closely: dead pixels remain permanently unlit dark black dots, while stuck subpixels display a fixed color regardless of background.

03.What is the difference between 5% and 10% OLED dark gray banding tests?

The 5% and 10% dark gray tests use low-luminance gray patterns (IEC 62341-6-2 standard) to expose unequal organic subpixel wear, static image retention, dirty screen effect (DSE), and vertical banding on OLED, WOLED, and QD-OLED panels.

04.How do I run a screen test on a Smart TV using a remote or gamepad?

Open displaytestonline.com on your Smart TV browser (Samsung Tizen, LG webOS, Android TV). Our test includes a native W3C Gamepad API loop: use D-Pad Left/Right on your TV remote or Xbox/PlayStation controller to cycle patterns, and Press A/Cross for Fullscreen.

05.Why does the Screen Wake Lock API matter during visual inspection?

The Screen Wake Lock API prevents mobile devices, laptops, and Smart TVs from dimming or activating screen savers while you inspect your display for faint subpixel defects or backlight bleed.

06.How does color temperature (Kelvin) affect screen fill lighting and testing?

Our Kelvin temp wheel maps color temperatures from 2700K (Warm Soft Light) to 9500K (Cool Blue Light). It allows you to test panel white balance and turn your monitor into a high-CRI video call fill light.

07.How does the hands-free auto-cycle slideshow scanner work?

Click '▶ AUTO SLIDESHOW' on the test deck. The engine automatically cycles through all 16 diagnostic patterns at 3-second intervals, allowing automated scanning of large wall-mounted displays or multiple workstation monitors.

08.What are subpixel geometry reticles for QD-OLED and WOLED panels?

Subpixel reticles render high-contrast text and micro-lines to inspect unique subpixel layouts (RGB Stripe, BGR Inverted, QD-OLED Triangular, WOLED RWBG) for ClearType text fringing and color bleeding.

09.How do touch gesture controls work on mobile smartphones and tablets?

On touchscreen devices, swipe horizontally left or right to cycle test patterns, swipe vertically up or down to adjust brightness/Kelvin, single tap to toggle UI overlays, and double tap to enter true fullscreen mode.

10.How do I generate a SHA-256 Hardware Passport receipt for warranty claims?

Click 'SIGN SHA-256 PASSPORT' on the test deck header. The engine evaluates active telemetry (Resolution, DPR, Color Depth, Refresh Rate, Defect Pins) and exports a cryptographically signed verification certificate for eBay/Reddit listings or retailer RMA claims.

Not sure which test to run next? Need troubleshooting advice?

Read Complete Diagnostic Guide →