According to the hrmpf website (and MacRumors after it), Apple has submitted a patent No. 2008/0001787 called “Dynamically controlled keyboard” for a keyboard, each key of which is an OLED display with a control circuit controlled by software that allows display an arbitrary character on the key.
Familiar construction, right?
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It is expected that Apple, due to the effect of the scale of production, will achieve a much lower cost than a similar keyboard from you know who .