How To Address Computer-Related Eye Fatigue - EIZO GLOBAL

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LED backlight causes eye fatigue?

LCD monitors use backlights to display images. The number of reported cases of eye fatigue caused by screen flickering has increased since the popularization of LED-backlit Monitors. LCD monitors can even affect the eyes of people who don't notice backlight flickering.

How does flicker work?

Flicker is the result of backlight dimming (brightness control). There are 2 dimming techniques applied to LCD monitors: PWM (Pulse-Width Modulation and DC (Direct Current)

PWM Dimming Controls brightness by cycling the backlight on and off. Pros Wide brightness adjustment range. Simple circuit design. Cons High speed cycles may cause flicker on LED screens.
DC Dimming Controls brightness by adjusting power supply. Pros No flickering. Cons Difficult color reproduction with dark images. Complicated circuitry.
What is PWM Dimming flicker? The darker the screen, the more flicker

Tested: PWM vs. DC

We conducted an experiment to find out how users experienced flickering.

Did you notice any flickering?

Did you notice any flickering? DC dimming = Low flickering!

Did you feel eye fatigue?

Did you feel eye fatigue? DC dimming = Low eye fatigue!

Lastly, which was the easiest to view?

Lastly, which was the easiest to view? DC was overall easiest to view!

Source: EIZO Corporation; EyeCare Dimming Technology - October 2012 - Results vary from person to person.

How EIZO makes a difference

Hybrid Dimming Method

The FlexScan frameless monitors utilizes a hybrid solution to regulate brightness and make flicker unperceivable without any drawbacks like compromising color stability - even on low brightness settings as follows.

- High Brightness: DC Dimming Method - Middle to Low Brightness: PWM Dimming Method 		FlexScan Frameless

Furthermore, the monitors implement the high PWM method (over 10,000Hz) and the phase-shifting PWM dimming control in some models.

White Paper: Seven Ergonomic Features of the FlexScan EV Series [PDF]

EIZO Montiors Provide Great Eye Comfort and Great Image Quality.

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