|Re: Open45s: Display|
Message #9 Posted by DaveJ on 5 Nov 2007, 10:16 p.m.,
in response to message #8 by Walter B
For the landscape format models the standard 118mm x 36mm LCD module is a good fit. 2 lines by 24 characters, very versatile. Claimed thicknesses from 8.8mm or so. Plenty of vendor choice, and low in cost.
Not sure how many keys you can fit in after that though.
As previously mentioned, the 80mm x36mm module format would allow and interchangable LCD or OLED display, but only in a 16 character x 2 line display. But you could put keys to the side of the display.
The LCD modules have various pros and cons:
- Easy software development
- Multiple sources
- Defined mounting dimensions and holes make case design potentially easier, especially by a third party.
- Low cost in one-off's and off-the-shelf
- Greater power consumption than an LCD alone (typically a few mA @ 5V), but still low enough for say a year of typical operation from a AAA or Lithium coin cells.
- Not bit mapped, although you can often do custom characters
- Thickness may be an issue
- They are big
Given that a calc design is not about the display, but about the look and feel, and operation, yet you need a display to get the project off the ground, LCD modules do offer a reasonable compromise.
Edited: 5 Nov 2007, 10:19 p.m.