Flickering Red Pixels on Monitor? (Cause + Fix!)

Flickering red pixels on monitor is a phenomenon that occurs when you install and use the LCD monitor. A black screen or gray screen appears in some places vertically at intervals of 0.25-0.5 seconds, especially when using graphics software like Photoshop that uses a large area of colors with gradations such as Red, Green, Blue (RGB), etc.

How to fix flickering red pixels on monitor?

  • Adjust computer resolution.

In the monitor control menu, manually decrease the vertical size and horizontal size by 10 or 20%. After that, use checkboxes to correct redness and greenness in the RGB color balance menu item. Keep increasing the screen display again until the flickering red pixels on the monitor disappear. 

As long as it disappears when decreasing the display area, it can be fixed. 

  • Change graphics card.

If you use a new computer or install and use a new video card, you might get some high-performance graphics cards with technologies for preventing flickering red pixels on a monitor.

For instance, ATI’s Radeon has an “Overdrive” function that enhances display performance, NVIDIA’s GeForce FX has an “Ultra Low” function that prevents flickering red pixels on a monitor, and Intel’s GMA X3100 has “SmoothVideo” function.

When you use computer programs like video recording software or game software on the Internet, you can prevent flickering red pixels on the monitor by activating Overdrive, Ultra Low, or SmoothVideo function.

When you install and use the LCD monitor, flickering red pixels on the monitor often appear as a black screen similar to the pale screen of a TV that does not have a channel selected. However, if it occurs with vertical lines or mosaic-like arrangement in a specific area (the center, left side, right side …), it is likely not to be the phenomenon of flickering red pixels on the monitor.

When you use the computer for a long time, it is related to computer heat generation and some problems with the power supply unit (PSU) inside that may cause damage.

For computers that are frequently used, set up the cooling system in advance: keep plenty of space below and above your computer, raise the computer from the ground by putting it on a table, etc.

From long-term use of computers or overclockers, some users may suffer from headaches and dizziness caused by flickering red pixels on monitor. If you are getting symptoms such as these, change to LCD that reduces such symptoms in advance.

If you are getting symptoms like these, you should see your doctor and get a physical examination.

Flickering red pixels on monitor is a new name of the phenomenon that has occurred in computers since 2002. In fact, flickering red pixels on monitor occurs in some LCD monitors regardless of their manufacturer, as well as computer screens or mobile phones. The reason is, LCD’s inorganic liquid crystal material is different from cathode ray tube (CRT), so the phenomena occurs.

If flickering red pixels on the monitor appear while playing video games or using some programs that frequently use full-color display and gradation like Adobe Photoshop, systems with high-performance graphics cards may prevent it by activating the anti-flickering function using Overdrive, Ultra-Low, or Smooth Video.

As a result of the effectiveness of this high-performance graphics card “Overdrive/Ultra Low/Smooth Video” is set by default when installing Windows XP, and also for Windows Vista starting from Service Pack 1. In addition, movement in video games works faster than before because screen processing is also optimized when you set Overdrive/Ultra Low/Smooth Video in the video settings of the graphics cards.

Flickering red pixels on the monitor can be prevented for some time, but it occurs over and over again, so a permanent solution is needed to fix it in advance. At present, there are some ways to prevent flickering red pixels on a monitor, but no perfect solution. There are two methods: exchange the existing LCD monitor with a new one that has good quality or change video card settings to prevent flickering red pixels on a monitor.

First of all, take some actions for preventing flickering red pixels on the monitor by changing video card settings:

  1. NVIDIA’s proprietary anti-aliasing algorithms can prevent it from occurring. In the case of NVIDIA FX series products, this function is called “Overlay”, and in the case of GeForce 6 and 7 series products, it is called “Ultra Low”.
  2. ATI’s proprietary anti-aliasing algorithms can also be used to prevent flickering red pixels on monitor. This function is called “Unified Video Memory Architecture” or UVA (it will be officially released after the launch of ATI HD series).
  3. The video card driver can disable Overlay and enable SmoothVideo instead of enabling it.

But these methods may decrease performance for some types of applications like video games, so if you cannot bear the decrease in performance, it is better to change the LCD monitor or video card with a new one.

If you have no choice but to use an old LCD monitor or video card, exchange your existing hardware and get a new one that supports the anti-flickering function. Check the information of products carefully before purchasing them at the shop.

Currently, Intel’s LGA775 platform and NVIDIA GeForce 8 series (GTX200) / ATI HD2000 series support this function.