What Are the Causes of LCD Display Screen Flicker And How To Fix Them?

Mar 23, 2022 | Articles

What Are the Causes-of-LCD-Display-Screen-Flicker


  1. What is Screen Flickering?
  2. CCFL Backlit Display Vs LED-Backlit Display
  3. Top Seven Reasons For LCD Screen Flashing
  4.  Four tips to fix a screen flicker
  5.  Final Words

1. What is Screen Flickering?

Screen flickering is due to changes in brightness that occur when the cathode ray tube projects on the screen while its refresh rate is low. The number of times the display hardware updates its buffers in one second is called the refresh rate. Generally speaking, the variation of brightness mainly occurs between cathode ray tubes.

With a refresh rate below 60 Hz, most screens will produce flicker visible to the naked eye, but a refresh rate between 70-80 Hz can make the screen almost flicker-free. If the refresh rate exceeds 120 Hz, the flicker cannot be seen by the naked eye. We call it flicker-free.

A problem that arises when fluorescent lamps are used on LCDs is that it has a frequency range that is beyond the range of human perception.

The reasons for the LCD Display flashing screen are given below: 

  • shielding coil
  • Signal interference
  • Hardware
  • Refresh frequency setting
  •  Monitor time is too long
  • Too high frequency
  • Similar to the frequency of the light source.

2. CCFL Backlit Display Vs LED-Backlit Display

LCD is divided into two CCFL backlights and an LED backlight. When the LCD display uses a CCFL backlight, the backlight power off, the lamp will continue to emit light for about a few milliseconds. The characteristics of the LED backlight allow it to control the speed of switching on and off the power supply more quickly to avoid continuous lighting when the power is off. Consequently, the LED backlight flashing screen will be more prominent than the CCFL backlight.


3. Top Seven Reasons For LCD Screen Flashing

  • The LCD Display Cable Shielding Coil

The screen will also interfere if the LCD cable has no shielding coil or anti-interference black bump.

  • Strong Electric Field Or Magnetic Field Interference

LCD is easily disturbed by a strong electric field or magnetic field, and sometimes the screen jitter is caused by the magnetic field or electric field near the LCD. To liquid crystal display ruled out clean everything around interference, move the computer to an empty table, then start boot test, if the screen computing phenomenon disappears. It means that your computer where you found it has a strong electric field or magnetic field interference. Please send suspiciously (e.g., speakers of the subwoofer, power transformers, magnetizing cup, etc.) from a computer nearby.

  • LCD Display Hardware Problems

Please turn off the LCD and turn it back on a few times to degaussing. (today’s monitors have automatic degaussing when turned on.) LCD screen flashing reason: LCD screen refresh rate problem & LCD display and video card hardware problems display.

  • Refresh Frequency Setting Of The LCD Display

The main reason for the LCD screen dither is the LCD refresh frequency set lower than 75Hz caused by, at this time, the screen often appear dither, flicker phenomenon, and we only need to put the refresh rate to 75Hz above. The phenomenon of the screen dither will not occur.

  • The Use Of LCD Display Time Is Too Long

Sometimes, because liquid crystal display time is too long, there will be a jitter phenomenon. The faulty display can be connected to someone else’s computer for testing to test whether the electronic components inside the display are old or not. If the fault still appears, the display is broken and repaired.

  • Highest Frequency Of The LCD Display Screen

The frequency of the LCD screen itself is too high, which leads to screen flashing. Generally, a few real-life problems cause screen flashing due to high frequency. People’sPeople’s naked eyes have no flicker feeling for the picture over 60hz, while the design standard of the general LCD screen is basically maintained on this data, so the frequency will not be too high under normal circumstances, but at the same time, the screen itself can not be ruled out fault. After the relevant instrument measurement is indeed the fault of the screen itself, in addition to the replacement of a new monochrome LCD screen is the design of equipment-related software.

  • Similar LCD Display And Light Source Frequency 

LCD and light source frequency close to the situation of the splash screen is very common, because the frequency of the different light sources is different, in certain cases, the frequency of the LCD screen and artificial light similar flicker is also more common, the best way at this time is a kind of artificial light or LCD equipment, avoid the splash screen.

4. Four Tips To Fix A Screen Flicker

1. Check your cables

Check the cable at both the computer and Monitor ends. Try replacing the cable with a new one if tightening or reconnecting it does not fix the problem. If that doesn’t fix the issue, it’s time to investigate something else.

2. Check the monitor refresh rate.

On a Windows 10 PC, you can check the refresh rate by clicking the Windows key typing “refresh rate” into the search field. Clicking “view advanced display Info” and clicking on “Display Adapter Properties For Display 1 “, or that number is causing the display issue.

In the window properties, click the middle tab, titled Monitor, and you will see an area to set the refresh rate.

  1. Check the video card.

A video card that isn’t properly seated on the motherboard can cause many problems, including a screen flicker. Turn the computer off and then open the case, remove the video card and connect the monitor cable to a second video card you have replaced the old one with. If the problem persists, the issue isn’t the card–it’s something else.

  1. Test the Monitor

Inspect the Monitor for physical damage and use the Monitor’sMonitor’s onboard buttons to check for settings that may be causing the issue.


5. Final Words

We have described information gives you the reorganization of the causes of LCD Display screen flicker with their solution.

LCD, although the price is not high, there are various problems. It will have multiple effects on our work and life. In ordinary life, when using LCD, as long as pay attention to the following points will extend the life of LCD.

All the screens flicker when it works. But we don’t see it all the time because it flashes too fast to catch the flickering in our eyes. When the screen’s refresh rate gets slow, we see the screen flickering. The causes behind screen flickering are very common properties. That’s why we always need to keep our device updated and clear the virus from the device to get a flicker less display.


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