>The rear one is grayscale. If I understand correctly, you're saying that there is a rear LCD that only either lets light in or blocks it without caring about

>The rear one is grayscale. If I understand correctly, you're saying that there is a rear LCD that only either lets light in or blocks it without caring about the color? That's interesting. As for why they aren't investing in this then, it's might be at least in part due to the power usage which would make it unsuitable for battery powered devices such as the iPad mentioned in the article.