A typical LCD display has an LED backlight that blinks at high speed, causing the screen to flicker. This flicker is called "flicker." Even if you don't actually feel the flicker, prolonged use may be straining your eyes.
Flicker
This refers to the minute flickering that occurs on the display at a speed that is invisible to the naked eye. It is difficult to recognize with the naked eye, but if you look at the monitor through a smartphone or other camera, you will see what looks like a black horizontal line on the screen. This is flicker. Even if you are not aware that flicker is occurring, it causes the pupils to adjust from large to small at high speed, affecting the autonomic nervous system and accumulating fatigue in the body, which can cause stiff shoulders and headaches.
What causes flicker
The backlight of the display adjusts the brightness level using pulse width modulation (PWM). The use of pulse width modulation (PWM), which adjusts brightness by blinking the LED, is cited as the cause.
With pulse width modulation (PWM), when the brightness is 100, the LED backlight is always at maximum so there is no flickering, but as the brightness is lowered, the backlight lights up more frequently, making the flickering more noticeable.
Measures against flicker
Many recent monitors are "flicker-free".
Flicker-free is not a PWM method, but a DC method that adjusts the brightness by increasing or decreasing the current flowing through the LED.
Therefore, the backlight does not flicker, and eye fatigue can be reduced even when looking at the monitor for a long time.
Even if the monitor is not flicker-free, flickering will not occur if the brightness is set to 100, but then eye fatigue due to strong light will be a concern.
What do you think?
When considering an LCD panel, be sure to take a look at the method (PWM method/DC method) used.
