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First Dual-emission OLED Display in a Phone

Posted by CowboyNeal on from the both-sides-of-the-screen dept.

roc_face writes "Japanese electronics joint-venture company ELDis has come up with the world's first dual-emission organic light-emitting diode (OLED) display for a mobile phone. This means the screen can be viewed from both sides. It was on display at the annual Flat Panel Display exposition in Tokyo this week."

4 of 101 comments (clear)

  1. hang on... by tiled_rainbows · · Score: 5, Interesting

    Wouldn't that mean that all the text on one side of the screen would come out backwards?
    How useful is that?

    --

    evil math within Nature's Cubic Creation!
  2. I suppose dual-emmission sounds more impressive... by magickalhack · · Score: 4, Interesting

    They consume much less power than current devices and have faster response times.

    This seems like a much more interesting fact about them than that they can be viewed from both sides. I suppose one could take advantage of the dual-viewable nature, but it seems like something we already have an adaquate solution for: place a screen on each surface you want to have a screen on. Duh! ;-)

    On the other hand, I suppose the 2 sided viewability could be potentially beneficial to hybrid tablet PCs, which until now have had to rely on fragile-looking swivel mechanisms to rotate the screen between laptop and tablet functionality.

    Any indication as to whether or not the images on each side are identical (i.e. the back is a mirror image of the front) or if they can be controlled independantly?

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    This Sig Kills Fascists
  3. poor design by Anonymous Coward · · Score: 3, Interesting

    Ok guys, the major problem with OLED's is lifetime. In particular, they die after a certain number of Coulombs of charge have been pumped through them (while they are at a given temperature! increase the temp by 10 deg C and the lifetime drops in half!). So this means the total number of photons you get out is limiting. You want it bright so you can see it outside as well. This means that you generally want ALL the photons going to the viewer (using reflective matrix or lenticular material, etc.) to help do this. If half the photons go out the back, you have to drive it twice as hard to get the same usable brightness! Bad idea...

  4. ... and power loss, and phosphor life by bagofbeans · · Score: 3, Interesting

    See http://www.usdc.org/technical/downloads/Web_Report _0101/sld027.htm which is a Philips slide saying a 640x480 display will draw 28W. Not for my laptop, thanks. This is why all the bigger displays are 1 off demos for hype, and only the very small ones (about 2" diagonal max) are in production.

    The other big problem is phosphor life which varies with colour (blue is worst) and getting 10k hours is very difficult unless temperature is kept moderate.

    However, these displays look very good, although maybe too good for reasonable privacy because the viewing angle is TOO wide to my mind.

    IMHO, you won't these even competing with TFTs until 2007.