Burn-in, also known as image retention or ghosting, refers to the phenomenon where a display shows the outline of a previous image after switching screens, caused by displaying static images for extended periods. With the widespread adoption of OLED screens in smartphones, TVs, and high-end monitors, burn-in issues have drawn increasing attention from users. This article will systematically explain the causes of burn-in, distinguish the differences between OLED and LCD panel burn-in, and introduce a complete method for burn-in detection using solid color images, grayscale images, and online tools, helping you identify screen abnormalities early and take appropriate measures.

1. What Is Burn-in

The essence of burn-in is the inconsistent aging rate of different pixels in the display panel. When a screen displays fixed high-contrast content for a long time, the pixels in the corresponding areas continuously emit light or remain off, causing irreversible or temporary characteristic changes in the organic materials or liquid crystal layer. After switching screens, these unevenly aged areas cannot correctly display new content, leaving behind faint residual images.

  • OLED Burn-in: OLED pixels emit light independently, and the red, green, and blue sub-pixels have different lifespans (blue typically degrades fastest). Displaying static content for extended periods causes certain sub-pixels to be overused, reducing their brightness and creating permanent residual images. This type of burn-in is irreversible.
  • LCD Image Retention: LCDs rely on backlight and liquid crystal deflection. Liquid crystal molecules may temporarily fail to fully recover after prolonged exposure to electric fields, resulting in image retention. In most cases, this can be recovered after turning off the screen and letting it rest for a period of time, though in rare severe cases it may persist long-term.

2. Common Causes and High-Risk Scenarios of Burn-in

Any content displayed statically for extended periods can become a burn-in trigger, but the following scenarios require particular attention:

  • Static UI Elements: Elements that remain fixed on screen for long periods, such as phone status bars, navigation bars, desktop taskbars, and browser tabs.
  • High Brightness and High Contrast: Displaying white or high-brightness icons at higher brightness levels accelerates pixel aging in the corresponding areas.
  • Staying on the Same Screen for Extended Periods: Game HUDs, fixed data panels in monitoring software, store display units looping the same logo, etc.
  • High-Temperature Environments: High temperatures accelerate the degradation of OLED organic materials, increasing the risk of burn-in.

3. Preparation for Burn-in Detection

To accurately detect burn-in, it is recommended to test under the following conditions:

  • Ambient Lighting: Test in a dark or completely black environment to avoid ambient light interfering with the judgment of residual images.
  • Screen Warm-up: Let the screen operate normally for 10-15 minutes so that brightness stabilizes before testing.
  • Disable Auto Brightness: Manually adjust screen brightness to approximately 50%-70% to avoid interference from excessive or insufficient brightness.
  • Prepare Test Images: Prepare solid red, solid green, solid blue, solid white, solid black, and 5%-20% grayscale images. These can be saved locally or accessed through online tools.

4. Detecting Burn-in with Solid Color Images

Solid color images are the most basic and intuitive burn-in detection method. Solid backgrounds of different colors can reveal the aging conditions of different color sub-pixels.

  • Solid White Background: Observe whether there are localized areas that appear yellowish, bluish, or uneven in brightness. These may indicate brightness degradation of certain sub-pixels.
  • Solid Black Background: On OLED screens, pixels should be completely off when displaying black. If grayish or glowing areas appear, it indicates that pixels cannot fully turn off and may be aging.
  • Solid Red / Green / Blue Backgrounds: Check each primary color for dark spots, bright spots, or residual image outlines to determine the health of the corresponding color sub-pixels.
  • Rapid Switching: Quickly switch between solid color images and observe whether the residual image from the previous image is clearly visible.

5. Detecting Brightness Uniformity with Grayscale Images

Grayscale images can reveal minor brightness unevenness and residual images better than solid color images, especially low-brightness grayscale (5%-20% gray), which is very sensitive for OLED panels.

  • Full-Screen Grayscale: Display 5%, 10%, 20%, and 50% grayscale sequentially, and observe whether there are faint shadows of text, icons, or borders.
  • Low-Brightness Check: 5% grayscale is close to black and can detect the emission consistency of OLED pixels at low current, making it an effective method for detecting early burn-in.
  • High-Brightness Check: Grayscale above 80% can check whether high-brightness areas have localized brightness degradation.
  • View from Multiple Angles: Observe from both the front and sides, as some residual images are more visible at specific angles.

6. Complete Burn-in Test Using Online Tools

Online screen test tools typically integrate solid color, grayscale, gradient, and flicker tests, making operation more convenient and suitable for average users. The following are the complete testing steps:

  • Step 1: Open your browser and navigate to any screen test website (search for keywords such as "screen test" or "burn-in test"). Disable browser zoom and ensure full-screen display.
  • Step 2: Run the solid color cycling mode to display red, green, blue, white, and black sequentially, with each color staying for 3-5 seconds. Carefully observe for residual images, color patches, or brightness unevenness.
  • Step 3: Enter the grayscale test page and switch between different gray levels as prompted, focusing on whether residual text or icon outlines appear at 5%-20% grayscale.
  • Step 4: Run gradient or grid test images to check for localized color shifts or stripes, further assessing panel aging.
  • Step 5: If you suspect burn-in from a specific fixed icon (such as the status bar or navigation bar), switch to a gray background and hold it still, observing whether an outline appears in that icon area.

It is recommended that the entire testing process last more than 5 minutes and be repeated 2-3 times to ensure stable results. If residual images are visible at the same position across multiple colors and grayscale levels, it can be reasonably concluded that the area has burn-in or severe image retention.

7. Distinguishing Permanent Burn-in from Temporary Image Retention

After detecting residual images, do not immediately conclude that the screen is damaged. Both OLED and LCD screens can experience temporary image retention, which can be distinguished through the following methods:

  • Turn Off the Screen and Rest: Turn off the screen for 1-2 hours and then retest. If the residual image disappears or is significantly reduced, it is temporary image retention; if it still exists, it may be permanent burn-in.
  • Play Dynamic Video: Play high dynamic range video or screen refresh videos for more than 30 minutes to help pixels recover. If the residual image still does not disappear, the probability of permanent burn-in is higher.
  • Examine the Shape of the Residual Image: Temporary image retention typically has blurry boundaries and lighter colors, while permanent burn-in has clearer outlines, deeper colors, and may be accompanied by irreversible brightness reduction in that area.

8. Daily Recommendations for Preventing Burn-in

  • Reduce Screen Brightness: On the premise of meeting usage needs, try to keep brightness below 60% and avoid long-term high-brightness operation.
  • Shorten Static Screen Time: Set a shorter auto-lock time on phones, and enable screensavers or timed display shutdown on computers.
  • Enable Anti-Burn-in Features: OLED devices typically have built-in features such as pixel refresh, pixel shift, and auto-hide status bar. Keeping these enabled can effectively delay burn-in.
  • Avoid High-Contrast Static Elements: Change wallpapers regularly, enable auto-hide for the taskbar, and avoid using the same UI layout for extended periods.
  • Regular Testing: Perform a burn-in test every 3-6 months using solid color and grayscale images for early detection and intervention.

9. Summary

Burn-in is not an inevitable fate of OLED screens. By understanding its causes and using the screen reasonably, most users can significantly extend the lifespan of their displays. By combining solid color images, grayscale images, and online tools for testing, you can accurately assess whether a screen has burn-in or image retention, and distinguish between temporary retention and permanent aging. If testing reveals severe burn-in that affects daily use, it is recommended to contact after-sales service for professional testing or screen replacement. We hope this article helps you scientifically perform screen burn-in tests and protect your display devices.