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A tiny and personal test of some EVF

Started 4 months ago | Discussions thread
OP Roland Karlsson Forum Pro • Posts: 30,035
Re: pulse width modulation
1

C-Y-R wrote:

Pulse width modulation (PWM) is used to control the brightness of OLED panels of handphones

Does this mean that OLED EVFs on mirrorless use PWM as well?

Interesting question. I googled PWM flicker. OLEDS might be pulse width modulated for brightness at a frequency around 1 KHz. Some people claim they can see that, but most do not see it at all.

I have three comments

  1. I have no idea if EVF uses PWM.
  2. No, I do not think the problem with EVF is due to PWM flicker. I believe the problem is due to the fact that the camera cannot keep short enough exposure time.
  3. I am not sure about PWM flicker sensibility. Is it for real?

Regarding number 2. It is quite easy to test. Just put the camera at M or Tv and set it a 1/100 second and there should be no problems. Then set it at 1/25 and there should be problems. I also guess that e.g. 1/30 and 1/25 should behave very differently. There should be temporal interferences. I do not have any modern EVF camera, so I have to go to a camera shop to look at this though.

Regarding number 3. I am a FPS gamer and know a lot regarding monitors and refresh rates and those problems. And I would be very surprised if anyone can see 1 KHz flicker. If you do a high speed movie of your 120 Hz monitor, then you will see that it flicker A LOT! It is only really on at less than 10% of the time or so. And, you cannot see it.

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/Roland
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