Arduino Uno, TLC5940 and CAT4201 how do I make them work?

Other Hardware LEDs and Multiplexing
7

Hello there,

I finally got around to building the circuit as depicted in post #3. As stated by Chagrin earlier the LEDs do not fully switch off.
To make matters worse, even at full PWM Input from the TLC5940 the LEDs (350 mA) are orders of magnitude dimmer than
a standard 5 mm red LED.

In the light of the not-switching-off issue, is there a possibility to invert the input from the TLC5940?

Greetings
Tristan