I wish to buy some 16x2 characters LCD displays like the 162J. I need the best readability by low light with backlight switched off, so the background have to be very clear (I mean closest to white).

For example most calculators LCD displays are very good with a light gray background. But many avalaible 16x2 displays have a green background which is too dark.

I'm a bit confused by all the 162x variants and by the LCD technologies (TN, HTN, FSTN). Which one will be the best for that purpose ?