In recent years , Support DC Dimming has become a big selling point of many mobile phone manufacturers ,OPPO、 millet 、 Mainstream manufacturers such as Meizu have long followed up on this technology .
I don't know if you found out , A few years ago, many domestic manufacturers boasted that DC Dimming , Now the sound is getting weaker . Some of the manufacturers provide DC Dimmer switch , But after upgrading, it no longer supports . Why? ？
First of all, we need to understand DC What is dimming ？ Before that, China Mobile officially popularized the science .
At present, the mainstream PWM Dimming and DC Dimming is a way to adjust the brightness of the screen .
PWM Dimming is through the brightness of the screen 、 Turn off to change the brightness of the screen . Why when I adjust the brightness of the screen , The mobile phone is always on ？ That's because it's bright 、 It's fast enough , Beyond the range of human perception . The longer the screen off state lasts , The lower the brightness of the screen ; contrary , The longer the screen stays on , The screen will light up , It's also known as strobe .
But different people's eyes have different sensitivities to the alternate lighting of the screen , Some people are more sensitive , Encounter low frequency PMW Dimming screen , There will be eye discomfort , If it's serious, you may feel dizzy 、 nausea .
DC Dimming is to change the brightness of the screen by increasing or decreasing the power of the circuit , power = voltage x electric current , So changing the voltage or current changes the brightness of the screen , The dimming process is soft .
Back to the original question , Why some mobile phone manufacturers originally launched DC Dimming scheme , But later, they didn't give DC It's dimmed ？
such as , Samsung mobile phones have been used DC Dimming , But I turned over the car unintentionally , To this day, Samsung mobile phones are still not used DC Dimming （ Users brush the third party ROM Realization DC Except for dimming support ）.
Regarding this , Yijia technology Zhang Xuan （ Microblogging ID： Acid digital ） Explain today ,DC After opening, it brings a lot of new problems to the manufacturer's screen after-sales and quality reputation , This is an important reason why the switch is no longer supported by manufacturers .
although DC Dimming is not enough to protect your eyesight , But it can relieve the fatigue of human eyes when they look at mobile phones for a long time , For those on low frequencies PWM The dimming method is more sensitive and user-friendly , But this is not 100% perfect ,DC Dimming is easy to appear uneven color under low brightness “ Rag screen ” The phenomenon , Loss of dynamic range at very low brightness leads to poor color uniformity .
Unclear users will think it's a screen problem . At the moment DC The dimming effect is not perfect yet , Rag screen and color deviation are difficult to overcome , Manufacturers have to give up , Of course, major manufacturers need to make further efforts to improve this technology .
Mobile phone DC Does dimming matter to you ？
（ edit ： Cui Lirong ）