Rather than incur the budget-busting expense of a high-density PCB with many layers and lots of blind vias, [mitexla] came up with a clever workaround: two separate boards, one for the LEDs and ...

soldered directly to the PCB board in a four-step process. SMD has permitted the evolution of much smaller pixel pitches than Dual Inline Package (DIP) LED displays as the SMD bulbs relative to the ...