Calculator displays

[Garth Wilson]

Keep in mind that any of the displays that put out light, whether OLED, LED, VFD, backlit LCD, plasma, or anything else I might be forgetting, will be battery hogs. I suppose I can sort of understand the lure of old-time red LED 7-segment displays; but I sure don't want to have to charge my calc every night. Reflective LCDs (the kind that are optimized for using ambient light only, and produce no light on their own) were a godsend, and it was so nice to be able to even years without thinking about my batteries.