How do you solve a problem like lighting a Mirasol display? Sure, the technology provides something of a comprise between traditional E Ink displays and tablet LCDs, with full video and color, low power consumption, and the ability to be viewed in bright sunlight, but it still has some decided drawbacks: like a lack of backlighting. Qualcomm showed off a simple and elegant solution at this week's CES on the Hill, essentially embedding a book light into the device, lighting it from the front -- it's not the first time we've seen an e-reader arrive at this answer, but still, sometimes the easiest solutions are the best. The prototype shown off in DC this week had buttons on the rear for adjusting brightness, though according to The Digital Reader, Qualcomm will also be showing off a device with an ambient light sensor in the near future. The technology should be on store shelves this fall -- no word whether the device is capable of yelling at you for "ruining your eyes" by reading in the dark.