Transparent displays.

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jayanth.devarayanadurga

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The display in the photograph is OLED (Organic LED) not standard Electroluminiescent. The voltage needed in an electrouminescent display depends on how bright it has to be but is usually in the region of 100 - 200 V AC. The current is very small so most use self-oscillating single transistor inverters to produce the voltage from a ferrite transformer at around 10KHz frequency. I'm not sure if the Windows phone uses OLED or LCD, it isn't a product I would ever consider buying.

Brian.
 

https://www.zmescience.com/tech/trans...iwan-21022013/
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OLED, it tells you beneath the picture.

https://www.fonearena.com/blog/63088/...ile-phone.html
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That isn't a working phone, it's just a concept transparent case. The digits 0 and 1 you can see on it are lenticular, they change as the incident light angle changes.

**broken link removed**
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Same case but it mentions it will eventually have an OLED display.

https://www.youtube.com/watch?v=4gvw7qndc38
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Same device again. I can't watch Youtube here because my internet connection is so slow (~60K) but the description matches the earlier ones.

Brian.
 

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