Re:Eye Strain from LED Backlighting in MacBook Pro (2008)
by derefr on Saturday January 06, 2018 @07:37PM
(#16088358)
Question: this is a problem because the LED array (as an LED backlight or an OLED display is) all flickers in synchrony, right? Would it still be a problem if each LED in the array was hooked up to its own delay line with a randomized-at-the-factory value?
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Re:Eye Strain from LED Backlighting in MacBook Pro (2008)
by monochromatic on Saturday January 06, 2018 @09:13PM
(#16088687)
That would probably help some. Really, they should just flicker faster. There’s no reason not to do PWM at a kHz or 10, and nobody is going to see that flickering.
Re:Eye Strain from LED Backlighting in MacBook Pro (2008)
by CamperBob2 on Saturday January 06, 2018 @09:27PM
(#16088742)
Actually, there is a slight problem, in that many people will be able to hear the inverter.
It's tough to make a completely silent inverter that works near the peak of human hearing sensitivity. It can be done, but it's likely to be more expensive.
Going all the way to 20 kHz+ is probably the best strategy. LEDs can be driven well into the MHz range, but if you go too high, RF emissions compliance starts to become a problem.
Re:Eye Strain from LED Backlighting in MacBook Pro (2008)
by monochromatic on Saturday January 06, 2018 @09:58PM
(#16088844)
That’s a good point. Call it 50 kHz to deal with people who have abnormal hearing response.