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Top message:  OLED, I hear it's junk in the sunlight. by Mossburg031   Apr 15, 2010, 7:13 PM

Replying to:  Re: OLED, I hear it's junk in the sunlight. by primus   Apr 16, 2010, 12:52 AM

The truth about AMOLEDs: I hate Green!!!

by CellStudent    Apr 16, 2010, 9:53 AM

primus said:
I thought OLEDs worked better in sunlight than LCDs.



You heard wrong.

LED emission colors are based on the physical size of the semiconductor used to build them. The problem is that LEDs don't come in any kind of material that will resonate well at 520 nanometers wavelengths (green spectra). There are some HUGE fundamental limits in semiconductor physics that make getting a good green LED almost impossible.

This is why the AMOLED display on the Nexus One has 50% green LEDs, 25% red and 25% blue instead of the 33%+33%+33% an equivalent LCD screen like the Motorola Droid has. They tried to compensate for the low output intensity of existing green AMOLEDs by simply using more of them on the screen. Outdoor viewability improved, but there was an image quality compromise made with the decision and images don't look as crisp as they do on LCD displays

So, what does this have to do with outdoor viewing? If you consult a few astronomy textbooks, you will discover that the sun is, in fact, GREEN! It's primary light emission is in the 500-550 nm range, it's just so unbelievably intense that your eyes and mine perceive it as a yellowish white!

Hence, AMOLEDs don't do well outside- yet. We need an entirely new class of semiconductor to be invented before that will change, just like the development of blue and white LEDs required completely new technology to deploy.

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