The Wikipedia article on the Game Boy lists the display as an STN display, whereas the ones for TI graphing calculators don't give any detail. However, even knowing that it's an STN display only partially narrows things down because there's still a huge amount of variation, according to my further research, since these LCDs come in all sorts of forms. For example, there's different variations, such as CSTN, FSTN, FFSTN, with display modes such as reflective, transflective, or transmissive (whatever those mean). Moreover, all of these seem to have different color characteristics, some being full color, others being monochrome but not necessarily grayscale, some having pixel ghosting like the Game Boy while others are crisp and backlit, etc.
With all this different variation, can anyone narrow this type of LCD down to a specific category?
(For reference: I really like this type of grayscale, non-backlit, complete-with-pixel-ghosting LCD. I want to see they're still manufactured by anyone and use them in my personal projects if so.)