This is a Arduino library to make use of those usefull matrix led displays that runs with the display driver chip HT1632C from Holtek.
Some of them:
http://www.adafruit.com/products/555
http://store.sure-electronics.com/de-dp13211
http://dx.com/p/jy-mcu-3208-lattice-clock-ht1632c-driver-with-mcu-support-secondary-development-104306
This last one needs some little desolder skills if you want to drive it directly from Arduino, but it's really cheap.
The main goal of this libray are fast and smooth display animations. This is at the cost of some more high memory use (screeen buffer in ram).
Reduced size where is possible without sacrifice the speed it's a secondary objetive.
This Code is based on the work "Holtech HT1632 Driver Class" from Steven Moughan.
http://hackdev.com/sourcecode/ht1632-driver-arduino/

As stated by the license (CC BY_NC_SA 3.0) of the Steven code, and as this is a derived work, Steven it's not responsible, endorse or support this code in any implicit or explicit way.
There are snipets of what I think is public domain code (Bresenham's line, circle, some fonts...)
If you think that any part of this code are violating a licence statement or intellectual property, please let me know so I can replace the code.
Constructive criticism, ideas, corrections and patches are welcomed.
I make that extensive to the project page, wiki or license issues.
Any help to make the code support a broader type of modules will be greatly appreciated.