Quote:
Originally Posted by crankypants
Then why do all my LCD monitors have an adjustable framerate setting? Normally I can adjust it from 60 to 70hz. This one is adjusted from Windows 8 Control Panel. Right click Desktop, Choose Screen Resolution. Click Advanced settings. Click Monitor tab or Intel HD Graphics Control Panel tab if you have an Intel video chip. I can choose from 60 or 75hz..
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eturgeon is right the things are different with the LCD monitors. On the old vacuum tube monitors the display was literally blinking.
Now the display is only changing the color if there is new image. So if the screen show yellow color and it keeps this in time there wont be any changes in the pixels and there wont be changes or blinking at all.If there is something moving the screen the color of the pixel changes from one color to another. Here important is the response time which shows how long the pixel needs to change from one color to another. They usually refers from one shade to another grey shade (grey to grey, gtg ). On the LCD monitors the refresh rate mean how often the monitor is trying to refresh the screen and put new images. The response time shows how long it will take the pixel to change its colors. That's why on the 3D monitors where a high refresh rate is needed (at least 120, i.e. 60 for both eyes) the screens are made with very low response time 1 or 2 ms. If the response time is higher the screens cant keep up with the refresh rate and the image will blur.
But actually on many monitors there is other source of blinking, the back-light. Many monitors screens use PWM back-light brightness control i.e. the LEDs on the backlight are blinking to reduce the brightness. But after many complains especially online most companies offer many monitors that doesn't have PWM but instead direct linear control of the LED. So if something is blinking on the LCD monitor this is its back-light.
Quote:
Originally Posted by eturgeon
That being said, my problem is simply light related: the more light, the more headaches. It's as simple as that. For instance, I once bought a luminotherapy lamp, which has a strong lamp, and tried it an evening, for like 30 minutes, while reading a book. The lamp was standing 2 meters in front of me. I was not looking directly at it, since my eyes were oriented on my book, but in my field of vision, the lamp was present. It resulted in a headache that lasted the whole night, and even during the day after that. This was my first experience with this problem, that only got worst year after year. This was about 6 years ago.
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Putting light source in your sight is always bad. If the book is darker than this light source i.e. the lamp this mean eye strain and fatigue. This because you are staring at darker object when you have strong light coming in your eyes. The proper lighting for you is lighting coming above you or behind you. If this for your house better use some kind of diffuse lighting - lamps that lights the sealing not the room itself. Also you have less bright spots in this way.
And about the low blue light not every one says that this is bad. Check Philips for example.
http://dryeyestrain.blogspot.bg/2016...-all-fuse.html
"With its unique LightFrame technology Philips has continued on a long tradition of putting innovation to a meaningful use. LightFrame technology is based on the scientific tenet that blue light passed through the eye's third receptor refreshes your biological clock, energizes you, and gives you a greater sense of well-being. By using specially developed exclusive materials, Philips LightFrame display emits a specific wavelength blue light from it's bezel helping you to reduce eye fatigue and improving your concentration even after long periods of time in front of the screen".
They say that they are reducing the eye fatigue using blue light.