The DxOMark team has now come up with an interesting test. The result of this test on the OLED screen may explain your headache and eye pain.
The DxOMark team, which examines the cameras of the phones and the scores they give are generally accepted, came up with an interesting research today. After the tests on LCD and OLED screens, we can say that the cause of headaches and eye pains in people has been somewhat clarified. So, are OLED-based displays really the cause of headaches and eye pains? Let’s look for an answer to this question together.
OLED screen or LCD screen for eye and brain health?
Flickering in screen technologies refers to the continuous opening and closing of the screen. Although we are not physiologically aware of flicker, the eye still responds to flickering, and the iris is expanding and contracting in response to changes in brightness. This involuntary physiological response may explain your headache and eye pain, especially after staring at the screen for a long time.
Flickering on phones with OLED screens is still a big problem for many users. So, why does the phone screen flicker? As you know, there are two different panel types in the phone market, LCD and OLED. The LCD itself does not emit light. But it uses a very bright LED as a backlight source. In this way, the brightness weakening and flicker caused by the low transmittance of the LCD panel are prevented. In contrast, each pixel in an OLED display is an OLED that emits light on its own.
As we all know, smartphone screens are made up of diodes. Due to the inherent physical properties of the diode, that is, when the LED is dimmed by changing the current (mA), it will definitely affect the color of the LED. Therefore, smartphone manufacturers use a technique called Pulse Width Modulation (PWM) to turn the LEDs on and off with different pulse frequencies to dim the screen.
However, we often don’t see the LED switching on/off. In general, we only feel the dimming of the screen. The degree of dimming depends on the time the LED is off and on. The longer the downtime, the darker the screen appears.
Therefore, although LCD and OLED displays have different power supply methods for their light sources, both technologies will have a flickering effect. However, the flickering effect of OLED screens is usually more pronounced than that of LCDs. First of all, the frequency range of OLED screen and LCD screen PWM is different. The PWM frequency range of the OLED display starts at 50 to 500 Hz and above 1000 Hz for the LCD.
It should be noted that the human eye is sensitive to flicker up to 250 Hz. Therefore, even if you do not see the vibrations on OLED screens, your brain perceives these vibrations and causes headaches. If you have severe headaches, we recommend switching from the OLED screen to the LCD screen for a while. If your pain goes away after this transition, know that OLED is not the panel for you.