Some comments about the LCD displays Cypress ships with DVK -
1) They are puke green, there are several high contrast displays, like white on blue that are equally cheap
and intrinsically easier to read.
2) No backlght, no reason these days not to have a LED B/L, adds pennies to cost of display. Right now,
all the kits I have, I use a separate HID light I shine on board/LCD so I can see the display. Otherwise
in moderate room lighting they are very difficult to read. You would have to make notes to users regarding
impact on current drain in kit.
3) Display viewing angles poor, the technology has moved on in this area. I am sure you can get one
with wider viewing angles.
3) Offer a store item for 4 x 20, some other common form factors. Also OLED plug compatible
Just a thought, but you can contact manufacturers representatives, bring them in
for a meeting, and they can show you current technology displays. Discuss what's
changed, contrast/view angle/various enhancements. And many will meet your
cost goals with a superior display.
As an aside, B/L does not always intrinsically mean you get better viewing angles.
Look at papers on the optical path, and various problems, solutions, and phenomena.