Green Screen Test Online for Dead Pixel Check
Free online green screen test to check for dead pixels, green sub-pixel defects, and color uniformity on OLED, LCD, and phone displays. Pure green fullscreen — no install needed.
Click for Fullscreen Green Screen
Best for spotting pixel defects
Dead Pixel Finder
A pure green screen reveals dead pixels as tiny dark or black dots where the green sub-pixel fails to activate.
Green Sub-Pixel Test
Test the green sub-pixels independently to isolate defects specific to the green color channel on any display.
Color Uniformity Check
Verify that the green color appears evenly across your entire display without patches or color variations.
All Devices Supported
Works on OLED TVs, gaming monitors, laptops, tablets, and smartphones — iOS and Android.
Why Use a Green Screen Test for Dead Pixel Detection?
A green screen test isolates the green sub-pixels on your display, making it easy to detect dead pixels and color-specific defects that might not be visible on other test patterns.
What This Green Screen Test Reveals
Each issue becomes visible on a pure green background
Complete Guide to Green Screen Test & Green Sub-Pixel Dead Pixel Check
“A pure green screen isolates the green sub-pixel channel, making it the most effective test for green-specific pixel defects on any display type.”
This free online green screen test fills your entire display with pure green (RGB 0, 255, 0) so you can perform a green sub-pixel check, detect dead pixels, and spot color uniformity issues on OLED, LCD, and AMOLED screens — no software installation required.
How to Perform a Green Screen Test for Dead Pixel Detection
Follow these steps to use our free green screen test for the most accurate results:
- Set your display brightness to at least 50% for optimal defect visibility.
- Click "Enter Fullscreen Green Screen" above to fill your entire display with pure green.
- Look carefully for any black dots on the green screen — these indicate dead green sub-pixels.
- Check for any pixels showing red, blue, or other colors — these are stuck pixels.
- Take a photo of any defects you find for warranty claims or return requests.
Detecting Dead Green Sub-Pixels with a Green Screen Test
Each pixel on your display consists of three sub-pixels: red, green, and blue. A green screen test activates only the green sub-pixels. Dead green sub-pixels appear as tiny black dots on the green background because they fail to produce green light. This test is more targeted than a white screen test because it isolates the green channel specifically.
Green Color Uniformity Test for OLED and LCD Displays
Color uniformity issues appear as patches of different green shades across your screen. On a perfect display, the green should appear identical everywhere. Our green screen test reveals manufacturing defects, panel aging, and OLED pixel degradation that affect the green color channel specifically.
OLED Burn-in Detection with Green Screen
OLED burn-in often affects individual color channels differently. A green screen test can reveal burn-in patterns from static green-heavy content like battery indicators, status bar icons, or game elements. If you see faint ghost images or uneven green areas, your OLED display may have burn-in affecting the green sub-pixels.
Important: Combine with Other Color Tests
For a complete pixel test, combine the green screen test with red, blue, and white screen tests. Some pixel defects only appear on specific color channels. A pixel might work fine on red but fail on green. Testing all primary colors ensures comprehensive coverage of your display's health.
Supported Display Types for Green Screen Testing
This green screen test works on all major display technologies and devices:
OLED / QD-OLED / AMOLED
Individual green sub-pixels can be tested for degradation. Check for burn-in marks from green-heavy static content.
LCD / IPS / VA
Green sub-pixel defects are common on LCD panels. Test for dead or stuck green sub-pixels on any LCD monitor.
Phones & Tablets
Test smartphone or tablet screens for green pixel defects and color accuracy on any mobile device.
This free green screen test runs entirely in your browser with no download or sign-up required. Combine it with our other color tests for comprehensive display diagnostics.