We have a line of control systems designed 5+ years ago that use a 4x20 character LCD for display.
Newhaven NHD-0420E2Z-NSW-BBW or equivalent
They have been reliable, aren't too costly, "big" as char LCDs go, nice contrast, reasonable backlight current, ...
But, just as with all of the ongoing "AVR vs. Cortex" threads, one cannot stand still forever. Gotta get a new look out there; a little "flash", ... ;)
So, you GCLD users: comment on feasibility, cost, power, micro resources needed, and related. Thanks.
Cost of above: About $20/$25 in qty. 50
Size: 146x62.5mm (module); 120x40mm viewing
Current draw negligible; backlight <200mA
4 line x 20 character. This line of controllers has typically four logical "systems" per controller, so the summary display has one-line per each.
4-bit interface. I use Ready and RW so 7 pins plus backlight control pin.
I'd think that if I would go to GLCD I'd want color, not monochrome. (that wouldn't buy me much app "flash" I wouldn't think) The graphics could add functionality, such as showing sampled parameters over the course of an operation cycle.
Viewing area now is 120x40mm or 4800 sq mm.
Newhaven NHD-320240WX-CoTFH 320x240 has a display area about the same: 80mm x 60mm. But it is $60, and not color.
So what can I get in modest quantities for $25-$50, reliable supply at those prices (not just a one-time-buy), widely supported controller, QVGA or better (hmmm--240x128 might be good enough), so called 3.5" diagonal or bigger, perhaps a drop-in of a bigger display for the fancy model, reasonable pin count, maybe serial (SPI?) interface as I've seen discussed here.
Driving from an AVR8 I think I'd want something with an onboard screen buffer, right?
No fancy graphics or the like are planned so screaming update frame rate isn't critical.
Is it too much to hope for to try to design-in GLCD today at the cost of char LCD 5 years ago?