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JULY 2026 I I-CONNECT007 MAGAZINE 81 You're Designing a Manufactured Optical System 3 Perhaps the biggest misconception I encounter is the belief that designing an LED display is primarily a challenge in PCB layout, when it's actually a manufacturing challenge. Successful display prod- ucts happen through a combination of electrical engineering, mechanical design, thermal manage- ment, manufacturing processes, assembly quality, calibration, and long-term reliability. The PCB simply serves as the foundation that brings all those disci- plines together. I've reviewed technically impressive layouts that were unnecessarily difficult to manufacture, inspect, calibrate, or repair. In production, those designs often proved to be expensive lessons. Displays have very little tolerance for inconsistency. Things that influence the finished product include slight assembly variations, connector alignment, solder joint quality, component placement accuracy, LED binning, and mechanical tolerances. Individu- ally, each variation may appear insignificant. Collec- tively, they determine whether customers perceive a display as premium or problematic. That's why DFM isn't something you verify at the end of the project. It becomes part of the architec- ture from the very beginning. I encourage designers to ask questions that extend well beyond PCB layout and determine the long-term success of the product: • How will this board be assembled and inspected? • How will defective modules be replaced? • How will technicians access connectors during service? • What happens after thousands of thermal cycles? • Can manufacturing consistently build this de- sign tens of thousands of times? One observation I've made over the years is that the best designers for LED displays spend as much time thinking about manufacturing as they do routing. It shows engineering maturity. Engineering for Perception Display technology is advancing toward higher pixel densities, smaller pitches, brighter outputs, and thinner form factors. As such, the engineering challenges will only become more demanding. De- signers will have to deal with higher-speed inter- faces, greater power densities, tighter mechanical integration, and complex manufacturing processes. These challenges raise the bar for everyone in- volved in product development. Fortunately, the fundamentals haven't changed. Successful display designs still begin by under- standing that electrical, thermal, mechanical, and manufacturing decisions cannot be made indepen- dently. Every discipline influences the final image the customer sees. Conclusion Over the years, I've come to believe that LED dis- play design is really an exercise in engineering for perception, and display designers must also design for visual performance. The oscilloscope, thermal camera, and simulation tools remain essential, but none of them represents the final judge. The human eye does. That reality changes how we distribute power and manage heat, as well as how we think about manu- facturability, consistency, and quality. Most impor- tantly, it changes how we define success. The next time someone tells me they're designing an LED display, I probably won't ask about the processor, the interface, or even the LEDs. I'll ask them how they intend to design for the human eye. Because after more than three decades of reviewing PCB designs, I've learned that the most successful display boards aren't necessarily electri- cally perfect. They're the ones where engineering disappears, leaving the customer to notice only the image, never the technology behind it. Stephen V. Chavez is principal technical product marketing manager at Siemens EDA and chair of PCEA.