Though Amazon (AMZN -0.5%) doesn't release specific numbers on e-ink Kindle sales, giant e-ink...

Though Amazon (AMZN -0.5%) doesn't release specific numbers on e-ink Kindle sales, giant e-ink display manufacturer E Ink tips off in spades how demand may be slumping. "Our major customer was too optimistic about its sales in the fourth quarter of last year and ordered too much from us. That made the customer order almost nothing from us in the first quarter."