Google offers at least $880M to LG display for OLED investment

Re:Google offers at least $880M to LG display for OLED inves... by bsder on Sunday April 09, 2017 @11:18PM (#14075747)

Please specify what you are measuring, because the frequencies you are quoting are far outside human perception limits. These also don't match the numbers being quoted by the VR guys.

I'm extremely sensitive to refresh rates. I used to have two gigantic ViewSonic CRT monitors on my desk along with special Matrox video cards so that I could have high refresh rates.

60Hz gave me whacking migraines. 72Hz was fatiguing but didn't give me migraines. 80Hz+ and I was just fine.

I haven't had a migraine due to refresh rates on digital displays ever. Not even for incredibly slow displays.

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Re:Google offers at least $880M to LG display for OLED inves... by jfim on Monday April 10, 2017 @12:27AM (#14076017)

Keep in mind that LEDs and CRTs are two completely different things. CRTs have "phosphor decay," where a pixel hit by the electron beam will gradually turn on and fade out over time until being refreshed again. For LEDs, they're normally operated using a PWM; turn them off (0% brightness) and back on (100% brightness) fast enough and people don't really notice that instead of 50% constant brightness, they're getting 0%, 100%, 0%, 100% ... with a duty cycle of 50%.

You can see that even with LCD monitors. LCD monitors with a LED backlight will have a display refresh (ie. how often the pixels can change color) of, say, 60 Hz but the LED backlight might be run at 4 to 8 KHz (ie. how often the whole backlight turns on and off to give different brightness levels).

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Re:Google offers at least $880M to LG display for OLED inves... by kuschku on Monday April 10, 2017 @06:18AM (#14077264)

Remember, these are PWM frequencies, not refresh frequencies.

A 60Hz LED display is usually driven by a 4 or 8kHz refresh crystal.

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