Serial LED driver with individual PWM, compatible with common cathode bargraphs?
Looking at the TLC5940 datasheet, it looks like it could work. This probably isn't the best way to do it, but if you put the current limited resistors ahead of the LED pins to Vcc, and then tie the output pins of TLC5940 in between the resistor and LED, when the output is active, the LED will go out. Those outputs are essentially open collector.