Cyan Screen Test - Free Full Cyan Display for G+B RGB Testing
Pure cyan screen for RGB pixel testing, cyan uniformity test, color calibration, and display quality checks
Screen Test Colors
Comfort Colors
Press ESC or click/tap anywhere to exit fullscreen mode
How to Use This Cyan Screen Test Tool
- Open the cyan screen test - Visit this page on any device (desktop, laptop, tablet, phone, or TV browser)
- Set brightness for testing - Use 100% brightness for pixel testing; adjust lower for eye comfort or low-light use
- Verify the hex code - Default is #00FFFF, the pure cyan color for accurate RGB cyan channel testing
- Go fullscreen - Click "Start Cyan Screen" to display a full cyan screen across your entire monitor
- Test your display - Inspect for dead pixels, stuck pixels, uniformity issues, or use for color calibration
- Exit anytime - Press ESC, click, or tap anywhere on the screen to exit fullscreen mode
What is a Cyan Screen Test?
This tool displays pure cyan (#00FFFF) across your entire screen in fullscreen mode—whether you're testing a MacBook, checking an iPad, or diagnosing issues on an Android phone or Windows laptop. Cyan is created by combining green and blue at full intensity (RGB: 0, 255, 255), making it an efficient way to test both channels simultaneously.
For display testing, it helps identify dead or stuck pixels that may only appear when both G+B channels are active, reveals uniformity issues, and can expose color calibration problems. Unlike single-color tests, cyan can catch defects in either subpixel layer.
The tool uses your browser's fullscreen API for a completely uniform display with no distractions—ideal for accurate diagnostics and calibration verification.
Common Use Cases
Pixel Detection
Particularly effective for finding defects on any device—iPhone, iPad, laptop, or desktop monitor. Dead pixels appear as dark spots, while stuck pixels may show as green, blue, or other colors depending on which subpixels are malfunctioning.
Uniformity Testing
Check how evenly your display renders color across the entire screen. Reveals brightness variations, color tinting, and panel uniformity issues. More efficient than testing green and blue separately for identifying combined channel problems.
Color Calibration
Verify that your monitor's green and blue subpixels are balanced correctly. Cyan shifting toward green indicates too much green; shifting toward blue indicates insufficient green balance.
Display Diagnostics
Identify mura (patchy LCD defects), dirty screen effect, and backlight uniformity problems. The bright background makes subtle variations and color inconsistencies easier to spot.
Eye Comfort
Provides cool lighting less harsh than white. Useful for evening viewing or when you need a cooler ambient light source with soothing illumination.
Photography Background
Use as a distinctive backdrop for photography, video calls, or streaming. Offers a unique alternative to standard green screens with a cool, modern aesthetic.
Embed This Tool
You can embed the Cyan Screen tool directly on your website:
Frequently Asked Questions
What is a cyan screen test used for?
A cyan screen test is used to check your display's green and blue subpixels simultaneously (since cyan = green + blue in RGB). It helps detect dead or stuck pixels in either channel, test color uniformity across the screen, verify cyan channel calibration, detect OLED/AMOLED burn-in patterns, and identify backlight issues. Since cyan tests two subpixel layers at once, it's more efficient than single-color tests for combined G+B channel diagnostics.
How does a cyan screen help detect dead or stuck pixels?
A cyan screen reveals pixel defects in both green and blue subpixel layers simultaneously. Dead pixels appear as dark spots against the bright cyan background. Stuck pixels may appear as different colors depending on which subpixel is affected - a stuck green subpixel shows green, a stuck blue shows blue. This combined testing catches issues that single-color tests might miss, making it valuable for thorough display inspection.
Why use cyan instead of red, green, or blue for display testing?
Cyan tests both green and blue subpixels at once (RGB: 0, 255, 255), making it efficient for RGB panel checks. Issues in either the green or blue channel become visible on cyan. While red, green, and blue test individual subpixels, cyan (along with yellow and magenta) tests combined channels. A thorough display test should include all primary (RGB) and secondary (CMY) colors plus white and black for comprehensive coverage.
What hex color is best for a cyan screen test?
The correct hex color for a pure cyan screen test is #00FFFF (RGB: 0, 255, 255). This activates both green and blue subpixels at maximum intensity while keeping red at zero, making it ideal for combined G+B channel testing, cyan color calibration, and accurate subpixel verification. This tool displays #00FFFF by default.
How can I test monitor uniformity using a cyan screen?
To test cyan uniformity: 1) Display the cyan screen at 100% brightness in fullscreen, 2) Step back and view the entire screen, 3) Look for darker or lighter patches, color shifts, or banding, 4) Check corners for brightness variations. Reduce to 50% brightness and check again - some issues only appear at certain brightness levels. Cyan is particularly good at revealing dirty screen effect (DSE) and mura patterns.
Can a cyan screen help identify color tint or calibration issues?
Yes, a pure cyan screen can reveal color tint and calibration problems. If your cyan appears shifted toward green, there may be too much green or insufficient blue in your display's calibration. If it shifts toward blue, there may be too much blue or insufficient green. Uneven color tinting across the screen may indicate backlight issues, panel defects, or calibration problems.
Can a cyan screen detect backlight bleed or IPS glow?
While black screens are best for detecting backlight bleed, cyan screens can reveal related uniformity issues. Cyan is particularly effective for detecting dirty screen effect (DSE), mura patterns, and uneven brightness distribution. The bright cyan makes subtle uniformity variations more visible than on darker backgrounds. For comprehensive backlight testing, use both cyan and black screens in a dark room.
Does a cyan screen help detect early OLED or AMOLED burn-in?
Yes, a solid cyan screen can reveal OLED burn-in patterns because it activates both green and blue pixels at full intensity. Look for ghost images, uneven brightness, or color variations that correspond to frequently displayed static content like logos, taskbars, or navigation buttons. Testing with cyan along with other colors provides a comprehensive burn-in assessment.
Can a cyan screen reveal dead subpixels in the green or blue channels?
Yes, this is one of cyan's key advantages. Since cyan requires both green and blue subpixels to be active, a dead green subpixel will show as blue (only blue visible), and a dead blue subpixel will show as green (only green visible). Dead pixels affecting both channels appear as dark spots. This makes cyan screens efficient for detecting subpixel-level issues in either channel.
What brightness level is recommended for a cyan screen test?
For pixel and uniformity testing, use 100% brightness to make defects clearly visible. For color calibration, test at multiple brightness levels (100%, 75%, 50%, 25%) to check gamma consistency and how your display handles mid-tones. For eye comfort or low-light viewing, reduce brightness as needed. Some display issues only appear at specific brightness levels.
Why does my display appear brighter or dimmer in some areas on cyan?
Uneven brightness on a cyan screen typically indicates backlight uniformity issues (common in edge-lit LED displays), dirty screen effect (DSE), IPS glow (corner brightness on IPS panels), or panel manufacturing variations. Some unevenness is normal, especially on budget displays. Significant dark or bright bands may indicate a defect worth reporting under warranty.
Can a cyan screen detect mura or patchy areas on LCD panels?
Yes, cyan screens are effective for detecting mura (cloudy or patchy irregularities in LCD panels). The bright, uniform cyan background makes subtle panel imperfections more visible. Mura often appears as slightly darker or lighter patches that are most noticeable on solid color backgrounds. Test at different brightness levels, as mura visibility can vary with intensity.
Should I compare cyan with green and blue for a full RGB panel check?
Yes, for a comprehensive display test you should check all primary colors (red, green, blue) plus secondary colors (yellow, cyan, magenta) plus white and black. Each color tests different subpixels and combinations: RGB tests individual channels, while CMY tests combined channels. Use our quick color buttons to switch between test colors, or visit our Dead Pixel Test for automated color cycling.
Does a cyan screen work the same on phones, tablets, and monitors?
Yes, this cyan screen test works on all devices with modern browsers: iPhones, iPads, Android phones and tablets, laptops, desktops, and smart TVs. Simply open this page and tap "Start Cyan Screen" to enter fullscreen mode. Mobile screens can be tested for dead pixels, uniformity issues, AMOLED burn-in, and color accuracy just like computer monitors.
Is a browser-based cyan screen more accurate than a static image file?
Yes, a browser-based cyan screen is more accurate because: 1) It uses the exact hex value (#00FFFF) without JPEG compression artifacts, 2) It fills the entire screen via the fullscreen API with no borders, 3) There's no image scaling that could affect color accuracy, 4) It works across different screen resolutions and aspect ratios. Static image files may have compression or scaling issues.
Is this cyan screen tool free?
Yes, this cyan screen test tool is completely free with no registration, downloads, or hidden costs. It runs entirely in your browser, works offline once loaded, and can be used for display testing, photography backgrounds, or any other purpose as often as you need.