Quote:
Originally Posted by omnimodis78
So this is the absolute confirmation that it uses PWM. Thanks for that. Did your contact provide some qualitative reasoning as to why Kobo chose to deliberately go with PWM? I'd love to understand the reasoning as, if for no other reason, I'd assume it's turning out to be a PR issue for them.
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For the most part, PWM gives more linear dimming and colour consistency than controlling the brightness by modulating the current.
My personal opinion about the fuss over PWM is much that of one university study. They attempted to test what effects were caused by PWM in a blind test. The results were that 99% of the people tested could not tell 200Hz PWM from continuous current modulated brightness as the red/green/blue LED light source was moved between 10% to 90% brightness. Not very surprisingly, people who complained about eye strain and headaches were within .1% equally split between the PWM and continuous light sources.
The paper was almost worth the cost for the description of the computer control of the modulated current LED lighting that was required to make it more linear with consistent colour.
Admittedly this was not tested in circumstances where saccades would be a common happening since the test images being illuminated were not text pages.
As for being a PR issue? Other than the discussions here, I haven't heard anything else negative or positive about PWM and Kobo ereaders.