LCDs are unbelievably inefficient, but Clairvoyante has figured out a way to fix that with its PenTile RGBW display. The company claims the display will help laptop and cellphone batteries last 50% longer. The "W" in RGBW stands for white, where in addition to the red, green and blue subpixels used in each pixel of a conventional LCD display, Clairvoyante has added a white one, giving you a bright