Multi-Segment LED Display Backpacks Adafruit Multi-Segment LED Display Backpacks are a convenient, turnkey display solution for just about any project. These multiplexed LEDs are controlled by an onboard HT16K33 LED Controller using constant-current for ultra-bright, consistent color and 1/16-step display dimming, all via a simple I2C interface. The LED Display Backpacks include address-selection jumpers allowing multiple displays to be used on a single I2C bus.