Ripples or stripes appear on the viewfinder or photo when I take a photo of a screen

Ripples or stripes appear on the viewfinder or photo when I take a photo of a screen

Problem:

Ripples or stripes appear in the viewfinder or photo when the user takes a photo of an OLED phone screen, computer screen, or TV screen.

Cause:

Some OLED screens adjust brightness through the pulse-width modulation (PWM) method. This means that the screen backlight turns on and off continuously at a high frequency, which is imperceptible to the human eye but can be captured by the camera. The following image uses an OLED phone screen as an example:

When the screen brightness is 40%, the backlight is in a 40% duty cycle, meaning that the screen is refreshed with 40% bright bars and 60% dark bars each time. As the camera captures the dark bars, ripples or stripes appear in the viewfinder or photos.

When the screen is at full brightness, the backlight is in a 100% duty cycle, meaning that the screen is refreshed with 100% bright bars each time. In this case, no ripples or stripes appear in the viewfinder or photos.
When the screen is set to the minimum brightness, the backlight is in a 0% duty cycle, meaning that the screen is refreshed with 100% dark bars each time. In this case, the screen is black.

Solution:

This is a normal phenomenon and does not affect the normal use of your phone. HONOR phones use industry-leading OLED screens and cameras, and undergo rigorous testing before shipment to ensure that they meet all applicable quality standards.

Suggestions:

Before taking a photo of a phone's OLED screen, set the screen to the maximum brightness.
When shooting a phone's OLED screen, you can turn on screen anti-flicker in Eye comfort on the other phone to reduce screen flicker.
To capture content on the phone screen, it is recommended that you use the screenshot function instead.