My driver had to scan the rows one by one, and select the right colums to light up for each row

• My driver had to scan the rows one by one, and select the right colums to light up for each row
• For 2 or 3 RGB components, they could be lit up at the same time
• When scanning quickly enough the image looked continuous
• But to get more than 7 color mixes, I had to do PWM to change the intensity of each color component
• 4 bits per color gave 15 levels of intensity and 4096 color mixes

Writing a Adafruit::GFX compatible Row Scanning Driver