Thank you for your answer
Could you explain your proposal to use more shift registers to increase the brightness
I m using 4 shift registers, 2 for the 11 lines and 2 for the 10 rows in order to monitor easily my Clock 11per10 matrix.
How can I have fewer columns?
I tried to reduce the resistor values but the result is not good
Could you detail your last approach to use direct drive from 16-bit LED driver chips?
What are you thinking about component "ULN2003" or "using a "high-voltage" supply 12V, a small resistor to drop the rest of the voltage in series with the LED's, and a logic-level MOSFET (e.g., NDP6060L or similar) to turn the whole thing on". (Suggestion found into this topic "http://arduino.cc/forum/index.php/topic,55519.msg397941.html#msg397941
Thank you for your answer.