We are building a device based on a low-power CPU and we need to choose between a color back-lit LCD with a touchscreen and an "old-school" black and white LCD for the device. Obviously the user experience would be much better with the former, however, power consumption is a priority for us and in principle we can sacrifice user experience in case the black-white LCD saves us battery life considerably, i.e. for example 2 days vs. 5 days.
I'd appreciate if you could give me an insight into this. Am a software engineer myself.