In addition to the OLED panels, the screens with high soda rates were to have fun The big news in the smartphone market. However, practically any cell phone has a 120 Hz screen and even LTPO technology, so it was necessary to look for a new approach.
Some producers have decided to sell high brightness levels, others to improve the tactile sampling speed, but others have taken a path that probably does not know what is happening. We talk about it mobile phones that claim to have a very high PWMalso around 4000 Hz, but What does it mean?
If you want the answer, then you have reached the right place because we will tell you What is PWM in cell phones, what is it for y How this technology is very important for your visual healthdespite being widely ignored by users and media.
What is the modulation of the width of the impulse? A key technology on mobile screens
The acronym PWM means “width of the modulated impulse”, which translated into Spanish is the “modulation of the width of the impulse”. This is a technology Key in the regulation of the screen brightness on your mobileThis is what allows him to be reduced or increasing according to the way he configures it.
How do you do it? Well, contrary to what you certainly believe, Changes in brightness levels On your cell phone screen they do not occur because their pixels are attenuated or increased directly. Whether you put the screen of the screen 100%, 50%, 20% or 0% is only an easy visual indicator to understand for the user. It is a residue of the ancient analog signal controllers, but these are no longer used.
Today in mobile phones and many other devices, digital signal controllers are used due to its price, energy size and efficiency. And what happens to this? What Digital signals have only two states: ignition and off.
How do you regulate the brightness if you can turn on or out of the panel? It’s there when the PWM comes into play, which he does is Take on the high -speed shutdown process So that it seems that the brightness of the screen is larger or less, but without you notice the flicker. How does it work? Let’s go to that.
How does the PWM regulate the brightness of the mobile screen?
With the advancement, the PWM makes it is turned on and off the high -speed mobile screen to simulate the change in brightness levels. AS? Modular that ignition/deactivation cyclemaking it complete more or less times to the second (flicker). Look at the image that we show you below and continue to read below to understand it:
When setting the brightness of the 25%screen, the ignition/deactivation cycles are very short. When it configures it at 50%, you can see how every cycle lasts more and there is a tie between off and accent. AND If you regulate the brightness at 75%, the cycle becomes much longerkeeping the screen much longer than outside.
Every time a ignition/off cycle is completed. An Hz frequency, measured on the basis of a second. So, if a screen has a PWM up to 960 Hz, it means that it flashes (completes the cycle) up to 2160 times in a second.
For consent it is established The flashing light is invisible to the 400 Hz human eye. However, this does not mean that there is no impact on our point of view if it goes to 401 Hz (for example).
In the LCD panels it is easy to reach high frequencies and control the brightness because the entire matrix is retro -clay. However, on OLED screens it is very different, because each pixel lights up and turns off individually. AS, The flashing light becomes more evident, there is a greater delay in the answer of the screen and this causes greater visual effort. AND, Did you know? OLED panels are very famous in the mobile market today.
How does the flicker of the screen affects your sight and how does PWM help you reduce it?
The image above? When you look at your mobile screen through a camera, you will surely have noticed it You can see the black lines that move. This is the flicker that we are not able to see with our eyesBut a camera captures it.
As the PWM frequency increases, these lines become smaller and/or less visible to the camera, but they also have an effect on our point of view (even if we cannot see them). That impact translates into greater visual effort, dryness in the eyes, headache and also damage to our vision in the medium and long term. And what PWM frequencies is the impact lower? Let’s see it:
- Less than 480 Hz: frequencies that are considered They do not have visual protection. When Pwm was born, 180 or 240 Hz were worked regularly. Some cell phones manage these frequencies at different levels of brightness.
- 480 Hz at 1919 Hz: There is a little visual protectionSo the impact of the flicker is lower. Most cell phones are in this range.
- 1920 Hz at 3125 Hz: Are considered Frequencies with medium visual protection. Many high end cell phones have pwm screens on these frequencies.
- Greater than 3125 Hz: Are considered Risk -free frequencies of damage to the human eye. Smartphones reach these levels, Magic 7 Pro Honor is one of these (4320 Hz).
Knowing this, then it is a good time to tell you this closing phrase: the PWM is a very important technology on the screens, because it helps your visual health. So instead of worrying only with high image soda rates, a lot of brightness or large resolutions, It’s time to pay attention to the PWM. Do you agree with us?
