Common Cathode vs Common Anode LED Displays
On a common anode module the LED anodes are tied together and the driver IC sinks current from the cathodes. On a common cathode module the cathodes are tied to a per-color supply and the driver sources current — letting each color run at its own lower forward voltage, which cuts heat and power.
Why common cathode saves energy
Red LEDs need far less voltage than blue/green. A common-anode design wastes the difference as heat in series resistance; common cathode feeds each color its own optimized voltage, so a common-cathode wall can run noticeably cooler and use less power — valuable for large or always-on installs.
The driver IC has to match
Common anode uses a current-sink driver; common cathode needs a current-source driver (or a source-capable part). For example the ICND2069 is a source/PMOS-style driver for common-cathode/source-drive designs, while the ICND2065 sibling targets the sink configuration. Your receiving-card firmware also has to be set for the right polarity — check the chip page or upload your config to confirm.
FAQ
Is common cathode better than common anode?
Common cathode is more energy-efficient and runs cooler because each color uses its own optimized voltage. Common anode is simpler and still widely used. The driver IC and module must be designed for whichever you choose.
Can I use any driver IC with common cathode?
No — common cathode needs a current-source-capable driver. Using a sink-only part on a common-cathode module will not work. The /ic-chips/ pages note the drive type.