Thread: Switch from Kindle Oasis to Kobo Forma?
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Old 08-07-2019, 08:11 PM   #22
davidfor
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Quote:
Originally Posted by lumpynose View Post
Try telling that to people who swear they can see it. On the other hand could it perhaps be perceived when it's interacting, so to speak, with another light source? I.e., if there are fluorescent lights nearby? I remember when I first started working with computers that my boss said that fluorescent lights were bad when working on a computer because they caused flickering of the computer screen, which in those days were CRT terminals.
The issue is the frequency. The PWM used by the Forma is around 1MHz. The frequencies of the CRT screens were around 60Hz and flourescents would be 120Hz (or twice whatever AC frequency). 60Hz is at the upper end of most humans seeing it. The 120Hz is further up. The interaction between these were visible.

The only way to see the PWM of the Forma is the interaction with another high speed flickering. It was demonstrated using cameras capable of high framerates. I think it was some iPhones which did 240fps, but, it might have needed higher.
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