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What Is DC Dimming? Why Are Major Mobile Phone Manufacturers Doing It
What is the sanctity of DC dimming? Why has it suddenly become a pastry? China Mobile officials have popularized science.
In short, the current mainstream DC dimming and PWM dimming are a way to adjust the screen brightness. DC dimming changes the screen brightness by increasing or decreasing the circuit power. Power = voltage x current, so changing the voltage or current changes the screen brightness.
PWM dimming changes the brightness of the screen by alternating on and off of the screen. Why is the phone always on when you adjust the brightness of the screen? That's because the alternation of on and off is fast enough, beyond the range of human eye perception. The longer the screen off state lasts, the lower the screen brightness; On the contrary, the longer the screen is on, the screen will turn on, which is often called stroboscopic.
However, different people's eyes have different sensitivities to the screen alternating on and off. Some people are more sensitive. In case of low-frequency PMW dimming screen, there will be eye discomfort, which may lead to dizziness and nausea
How to intuitively distinguish PWM dimming and DC dimming? If you use the camera (the shutter speed is fast enough) to shoot the screens with two dimming methods, the screen with PWM dimming will have black stripes, while the screen with DC dimming will not.
As we all know, the current mobile phone screen is mainly LCD screen and OLED screen. The LCD screen is mainly DC dimming, while the OLED screen is mainly PWM dimming. Of course, it's not absolute.
Is DC dimming healthier? First, it is impossible to judge whether the screen is harmful to the eyes according to the dimming mode. It can only be said that some people are sensitive to low-frequency PWM dimming and are prone to eye fatigue, so they need mobile phones with high-frequency PWM dimming screens, or even DC dimming mobile phones.
However, DC dimming also has an obvious disadvantage, which will make the OLED screen abnormal in color, resulting in color deviation and other problems, which is also a problem that mobile phone engineers need to solve.
