Gray Spots on a Phone Screen: Latest Causes and Solutions

Why Do Gray Spots Appear on LCD/In-Cell Screens?

Gray spots on LCD/In-Cell screens essentially occur when the amount of light passing through a small area inside the screen decreases, causing that spot to appear darker than the surrounding area and resulting in a permanent gray spot or gray patch. These gray spots are typically not surface stains but rather stem from abnormalities in the screen’s internal structure. The main causes are as follows:

1. Localized Pressure Inside the Screen

When a phone is squeezed, subjected to impact, or when excessive force is applied to a specific area during screen installation, the liquid crystal layer, diffusion film, or backlight structure inside the screen may undergo slight deformation. Since light cannot pass through this area normally, it appears darker than the surrounding areas, resulting in a gray spot or patch.

2. Dust or tiny foreign objects entering the screen

If dust, fibers, or other tiny foreign objects enter the screen—particularly near the backlight layer, diffusion film, or light guide plate—they can block some of the light. When the screen displays a white or light-colored image, noticeable gray spots will appear in these areas, and they cannot be removed by wiping the screen surface.

3. Abnormalities in the backlight layer or light guide plate

LCD/In-Cell screens rely on the backlight layer, light guide plate, and diffusion film to distribute light evenly across the entire screen. If the light guide plate is compressed and deformed, or if there are abnormalities in the backlight structure, brightness in localized areas will decrease, resulting in gray spots, gray patches, or uneven brightness.

4. Damage to the Liquid Crystal Layer Itself

If the liquid crystal layer is damaged due to a drop, compression, water exposure, or prolonged use, the liquid crystal molecules in that area may fail to control the passage of light properly. As a result, even if the backlight itself is functioning normally, this small area will still appear darker, eventually forming a permanent gray spot.

Why Do Dead Pixels Appear on OLED Screens?

Dead pixels on OLED screens typically occur when a single pixel or a small cluster of pixels can no longer emit light normally. Since each pixel on an OLED screen emits light independently, localized pixel aging, drive circuit malfunctions, damage to the emissive layer, or physical impact can result in permanent gray spots, dark spots, or abnormal pixels.

1. Localized Pixel Aging

The organic light-emitting materials in OLED pixels gradually degrade over time. If a single pixel or a small area ages significantly faster than the surrounding pixels, it may result in reduced brightness or color abnormalities.

Each pixel in an OLED screen relies on an internal drive circuit to control its brightness and color. If the TFT drive circuit corresponding to a specific pixel malfunctions,

3. Damage to the OLED Emitting Layer

The organic emitting layer inside an OLED screen is extremely thin. If the emitting material itself is damaged, the pixels in that area may lose their ability to emit light normally.

4. Accidental Damage

When a smartphone is dropped, struck, crushed, exposed to water, or subjected to high temperatures, the emitting layer and drive structure inside the OLED may still be damaged, even if the outer glass remains intact.

Where on a smartphone screen are gray spots most likely to appear?

There is no single, fixed location for gray spots, but on LCD/In-Cell screens, they typically appear more frequently along the edges, in the four corners, in areas subject to pressure, and where the backlight structure experiences uneven stress. If a smartphone has been crushed, dropped, or subjected to excessive localized pressure during screen installation, these areas are more prone to developing gray spots or patches.

If dust or tiny foreign particles enter the screen, gray spots may also form anywhere near the backlight layer, light guide plate, or diffusion film; therefore, some gray spots may appear in the center of the screen as well.

Should I repair or replace my phone screen when gray spots appear?

Generally, gray spots and a gray screen cannot be fixed on their own. If the gray spots are minor and do not affect usage, you can ignore them. However, if the spots continue to spread or interfere with normal use, you will need to replace the entire screen assembly.

How Does XinWangLCD Reduce the Problem of Dead Pixels on Screens?

For smartphone screens, dead pixels not only affect display quality but also directly impact the user experience. XinWangLCD controls product quality at multiple stages—from panel procurement and production testing to after-sales service—to minimize display issues such as dead pixels and discoloration while extending the service life of the smartphone screen assembly.

Sourcing OLED and LCD Panels from High-Quality Panel Manufacturers

Screen quality depends first and foremost on the panels used. XinWangLCD prioritizes OLED and LCD panels from premium panel manufacturers to control screen quality at the source and reduce issues such as dead pixels and uneven display caused by panel defects.

Conducting Two Rounds of Screen Testing During Manufacturing and Before Shipment

Screens undergo one round of testing during the manufacturing process and another round after production is complete but before they are officially shipped to customers. Only screens that meet quality requirements are delivered to customers; these two rounds of testing help identify issues such as dead pixels and display anomalies as early as possible.

Providing Dedicated OEM Services for Rapid Issue Resolution

XinWangLCD also offers dedicated OEM services. If customers encounter issues regarding product specifications, display performance, or usage, they can communicate with us promptly for resolution, ensuring faster problem-solving.

Reducing Dead Pixels and Extending Screen Lifespan

From sourcing high-quality OLED and LCD panels, to double testing before production and shipment, to follow-up OEM services—all these measures aim to minimize display issues such as dead pixels in XinWangLCD’s smartphone screen assemblies, while improving product stability and extending the screen’s normal service life.

Which users should choose XinWangLCD to meet their OLED/LCD display needs?

XinWangLCD is ideal for:

Wholesale buyers: Seeking competitive prices and quality assurance

Startups: Needing solutions for small-batch orders without compromising on quality

International companies looking for a reliable manufacturing partner in China

Repair shops: Seeking high value for money and looking to build their own brand of smartphone screen assemblies

Individual users: Replacing screens themselves by disassembling their devices, or purchasing screen assemblies for installation by professionals

A&Q

How do I fix a dead spot on my iPhone screen?

If the gray spot is very small and does not affect usage, you can continue to monitor it for now. If the gray spot continues to grow, darken, or interfere with normal display, this usually indicates that the screen has sustained internal damage. In such cases, it is generally not possible to repair it yourself, and replacing the iPhone screen assembly is the most straightforward solution.

Why is there a grey square on my phone screen?

If a stationary gray square appears on your phone's screen, it usually indicates that the display in that small area is malfunctioning. For LCD/In-Cell screens, this may be caused by internal pressure, uneven backlighting, dust, or damage to the liquid crystal layer; for OLED screens, it may be due to localized pixel aging or a driver malfunction. We recommend replacing the entire screen assembly.