OLED have been coming soon for many years, but they have only hit the market in very small form. A few cameras and the over-expensive Sony TV. The biggest thing you will notice about an OLED screen is its eye-popping colors, which leads to ...
I would love an ebook reader that weighs 0.0001 oz; has a colorful 3d display; folds up to a postage stamp, but opens to any size up to that of a full newspaper; runs book software but also plays games and runs pc software; and washes my dishes for me -- all for nine dollars and ninety-five cents
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However, today computing technologies have many problems when applied to book reading. The devices are too expensive, the battery life is short, eye-strain is an issue, as is portability in both size and weight.
In considering tradeoffs, brilliant color is not a high priority. What we really need is a display that handles static text (not motion and not color) in a low-power, light-weight, and low-cost manner. Today, e-ink comes closest to fitting the bill.
The vivid colors of OLED are wonderful, but are not necessary for reading text. Some might even argue that they are too bright for continuous reading. I am sure you could dial them back into a black-and-white mode, but then you will be giving up one of their major advantages. The prices are just too expensive and the availability has been continuously sliding out. If they ever become ubiquitious and cheap, I am sure that they will find their way into e-readers. For now however, they have been concentrated on the market willing to pay a premium for their brilliant displays.
I suspect we will see quite a few other applications of OLED tech before it penetrates the e-book market.