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A comment on Eye Strain from LED Backlighting in MacBook Pro (2008). Parent comment

Re:Eye Strain from LED Backlighting in MacBook Pro (2008) by walterbell on Saturday January 06, 2018 @06:37PM (#16088117)
A statement from Apple would be best, for an issue that has affected customers for nine years.

PWM backlighting was introduced on the iPhone X and is affecting some customers.

edit: s/backlighting/OLED dimming/

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Re:Eye Strain from LED Backlighting in MacBook Pro (2008) by aceoflolo on Saturday January 06, 2018 @06:37PM (#16088125)
Why does the iPhone X need backlighting when it has an OLED screen?
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Re:Eye Strain from LED Backlighting in MacBook Pro (2008) by walterbell on Saturday January 06, 2018 @06:49PM (#16088173)
Maybe someone who knows more about AMOLED panels can comment about the role of PWM? It seems to be something other than brightness control, the article at [1] says:

At any level of brightness, modulation with a frequency of approximately 60 or 240 Hz is present ... It can be seen that the amplitude of the modulation is not very large at the maximum and near to it brightness, as a result there is no visible flicker. However, with a strong decrease in brightness, modulation appears with a large relative amplitude, its presence can already be seen in the test for the presence of a stroboscopic effect or simply with rapid eye movement. Depending on the individual sensitivity, such flicker can cause increased fatigue."

[1] https://translate.google.com/translate?act=url&depth=2&hl=en...

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Re:Eye Strain from LED Backlighting in MacBook Pro (2008) by rayiner on Saturday January 06, 2018 @07:04PM (#16088233)
PWM is used to control the brightness level of each pixel.
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