Unfortunately, the high ambient light fidelity of current transmissive modulatory LC displays is unlikely to increase significantly in the short term due to ambient light diffusion and contrast between voltage-on and off pixels. (the backlight still transmits even when all orthogonal liquid crystals are in the voltage -off state..)
Apple currently uses an LED backlit in-plane switching tft transmissive lc display for it's mobile products. Sunlight readability could be improved slightly if Apple switched to an emissive display, such as OLED, like Samsung's active matrix and "super" active matrix display technologies, but fidelity would still not be comparable to a transflective or reflective display.