I find that even with quite low current consumption the 7805 dissipates sufficient heat to require a heatsink and to that extent I avoid that part. On the other hand, the 78L05 is great. Small TO92 footprint, low heat dissipation... yes it's spec'd at 100mA, but I seldom draw more than 50mA from one, and I'd fit two... one for the +5v for your microprocessor and logic, and the other for the Backlight. Two or three 78L05's take up less real-estate as a single 7805 horizontal with a heatsink and in total cost less. Actually, most backlights can happilly run from an unregulated supply provided you suitably current limit them.