When display devices are used for a long time, the most common issue encountered is the appearance of black spots on the screen, which affects viewing and usage experience. Next, I will sort out the reasons and fix methods for black spots on various display devices (including mobile phone screens, laptop screens, and LED screens).
Causes and Fix Black Spots on Mobile Phones
Causes of Black Spots on Mobile Phones
A Dark Spot Appears On The Top Left Corner Of The ScreenAfter excluding user-induced problems such as drops and impacts, here are several main reasons for black spots on mobile phones:
Natural Aging
Most mobile phone screens are made of OLED or LCD, with a typical lifespan of 5–7 years. When the usage period approaches or exceeds this range, it is likely to cause black spots on the screen.
Overheating and Burning
This issue is not uncommon, especially when using the phone in hot environments or near heat sources. An example from last year involved a friend’s child playing games on a phone in strong sunlight, leading to the screen burning out after a while.
Screen Freeze
Low performance or poorly optimized software can cause the screen to freeze, leading to partial or full blackouts. This often happens with high-demand apps like WeChat and Facebook.
Quality or Transportation Issues
If black spots appear on a newly purchased phone, it is likely due to issues during manufacturing or transportation, such as assembly line faults or impacts during shipping.
Fix Black Spots on Mobile Phones
Replace the Phone
If the phone is too old or performance is too low, transferring data to a new phone is advisable. Online solutions like software optimization or data clearing are often limited in effectiveness.
Avoid Overheating Environments
If we search for information about “mobile phone overheating and explosion” on the Internet, we can see many news reports about improper use of mobile phones, which cause the phone to heat up, shorten its service life, or even explode. Therefore, we should try not to use mobile phones in overheated environments to avoid unnecessary problems.
Contact Manufacturer for Quality Issues
When we encounter quality or transportation problems, we can call the service number of the mobile phone website, communicate with the mobile phone manufacturer, and choose to return a new mobile phone.
Causes and Fix Black Spots on Laptops
Causes of Black Spots on Laptops
Dark Spots Appear On The ScreenScreen Dirt
If the screen of the laptop is accidentally stained with dirt, it may cause a small area of black spots or black spots to appear somewhere on the screen.
Overheating or Overcooling
The liquid crystal material in screens is sensitive to temperature. Extreme temperatures can affect display performance, leading to black spots or triggering hardware protection mechanisms that prevent the laptop from starting.
Unstable Voltage
The screen of the laptop is mainly made of LCD or OLED technology. The liquid crystal material inside it will not only be affected by temperature, but also by voltage. When the voltage fluctuates, it is very easy to damage the internal transistor, resulting in black spots on the screen.
Prolonged High Brightness Usage
If the laptop screen is kept in high-brightness for a long time, it is easy to cause the screen’s service life to come early.
Fix Black Spots on Laptops
Clean Screen Stains
Alcohol can dissolve most stains, so the wiping effect is very obvious. We can gently wipe it with a cotton swab dipped in a small amount of alcohol. If it is stained with oily dirt, then we can first dip a small amount of detergent on the cotton swab and wipe it, then wipe off the stains dissolved by the detergent, and then use the cotton swab dipped in a little alcohol to wipe it again.
Use in Suitable Environments
Because overheated or overcold environments can cause abnormal screen display, in addition, overheated environments can also make some hardware (such as CPU) more prone to failure. Therefore, we try to use laptops at the right temperature.
Install Voltage Stabilizers
For some areas where the voltage is not stable, we can connect a constant voltage protection device to the main voltage switch. When the voltage of a certain line is detected to be higher than the critical value, it will automatically disconnect or adjust the voltage to protect the device from screen damage caused by voltage problems.
Reduce High Brightness Usage
Laptops are usually used indoors, so generally few people will adjust the brightness to the highest level for a long time. We recommend turning on the computer’s automatic brightness adjustment or power saving function, so that when the light changes or the power is low, the brightness will be automatically adjusted to avoid long-term high-brightness use.
Causes and Fix Black Spots on LED Displays
Causes of Black Spots on LED Displays
Dark Spot Appear On The ScreenMismatched LED Module Refresh Rates
Using LED modules with different refresh rates (e.g., 1920Hz, 3840Hz, 7680Hz) can cause display issues.
Insufficient Receiver Cards
Each receiver card can support up to four LED cabinets. Exceeding this limit can result in display issues.
Configuration Errors
Errors during parameter configuration by LED display engineers.
LED module damage
When some LED modules are damaged, black spots or black spots will also appear in some areas of the screen.
Fix Black Spots on LED Displays
Use Same Refresh Rate LED Modules
When splicing LED modules, we can ask the LED display manufacturer for the specific parameters of the LED modules to ensure that the same LED modules are selected for splicing.
Increase Number of Receiver Cards
Since there is an upper limit to the capacity of the receiving card, we should match the number of receiving cards in a ratio of 1:4. It is worth noting that if the number of LED cabinets is not a multiple of 4, you need to add a receiving card on this basis. For example, if there are 13 LED cabinets, then 13/4=3.25, so we should use 4 receiving cards.
Reconfigure Parameters
Ask the LED display engineer to readjust the parameters. For example, if a 1920Hz high refresh LED module is used, the refresh rate of the parameters should be correctly adjusted to 1920.
Replace damaged LED modules
Generally, when LED display manufacturers send out LED screens, they will come with some spare modules to replace abnormal places. Therefore, we can use the manufacturer’s spare LED modules to replace the problematic places. If you want to repair a broken LED module, you can check the following YouTube video:
Summary
This article elaborates on the reasons and repair methods for black spots on mobile phone screens, laptop screens and LED displays during long-term use. I hope it will be helpful to you.
