9/1/2023 0 Comments Eye break reminderThe ideal flicker-free monitor has a constant voltage applied to the backlight. Some flicker-free monitors actually still flicker but they flicker at a higher frequency which is better for the eyes. We need new kinds of technology and new kind of monitors which change the colors fast without flicker and without excessive blue light. One of the best ways to fix this problem is to just use E-ink devices but they are slow for real-time images. The problem is that the lower the frequency of this flicker the bigger is our iris contractions and the more we feel eye pain. This is why manufacturers use cheap and energy-efficient methods like Pulse-width modulation to control the brightness of the monitor. Better battery life sells and this is why manufacturers prefer to make low backlight frequency monitors. The bigger problem is actually that the lower the frequency of this flicker and the bigger the breaks between these 2 states, the more energy-efficient the monitor is.Įnergy efficiency sells. LED lights will use a lot of energy if they are constantly ON and they may also overheat. You may be thinking why do the monitors need to turn ON and OFF and why they can’t just glow all the time, but it’s not that simple. This is how our eye controls the amount of light entering it. When there is a lot of light around us or there is lots of daylight our pupil is undilated. The science behind this thing is that in dark we need more light and our pupil is dilated. You can test this by turning the light in your room ON and OFF fast and take a video or look in the mirror. Of course, the amplitude here is much bigger to show the effect since the flicker rate of the monitor is much faster but basically, our eye starts to contract like a muscle. Our brain is slow and we do not perceive this, but our eyes are fast and our iris starts to open and close like this In order to reduce their energy use and brightness, you need to turn them ON and OFF hundred of times per second.Īnd this thing, this ON and OFF thing is called flicker. But instead of one light bulb, we have millions of them in the size of several inches. In our modern lifestyle, it’s best for us to try to replicate this gradual change with programs like Iris which tries to replicate the Sun spectrum change. Our biology has evolved for millions of years to work together with this shift of light and we also need this change. Well, there is actually no light at night, but still. The thing about sunlight is that not only it’s full spectrum light, but it also changes during the day and night. The standard Incandescent Edison light bulbs are good at producing blue light, but they again fail in the morning when we need blue light to lift our mood. In humans, blue light regulates our mood and it’s important also, but at night it stimulates our melanopsin photoreceptors in the eyes, our melatonin secretion stops and we can’t fall asleep if a lot of blue light is present around us. Science has proved that plants grow way bigger when they get a lot of red light and low amount of blue light. If you read about this, red light is actually one of the most important lights. We can somehow fix this by reducing the color temperature of the screen, but the red light never becomes more and this is why we need more red light exposure. The problem is not actually the blue light, the problem is the ratio and that red light is almost missing from our monitors. Notice how much blue light the LED lights emit and how little green light. The light emitted from the sun is like the first graphic while the light emitted from monitors is like the third graphic. Yes, the Sun emits also UV light, but our body is attuned to UV light and produces important substances like Vitamin D when we get it from the Sun.ĭirect UV light exposure to our eyes is also not so good, but UV light is stopped at the front of our retina while blue-violet light enters deep into our retina and may cause macular degeneration in the long run.Īt the picture above you see the light specters of different light sources. We need this kind of ratio and this is embedded in our biology. Notice how blue, green, yellow and red light are almost equal. SunlightĪt the picture above you can see the light spectrum of the sun. They emit all colors of the rainbow but as you can guess it’s probably not so normal to look at the Sun at night.īut unlike the Sun, monitors don’t emit full spectrum sunlight. The second interesting thing about monitors is that they should be like a lightbulb. The interesting thing about monitors is that they should be like the Sun.
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