I was recently wandering around an international digital signage conference, and I became more excited about the capabilities of this industry to innovate in fine-pitch. We are, quite frankly, exceeding everyone’s expectations. The display systems continue to get thinner and lighter. The interfaces between the cabinets are transitioning to cable-free. The weight in kg/m2 continues to decline and the ability to build finer pixel pitch displays is exploding. Everywhere I look there is 2.5-millimeters, 1.8-mm, 1.6-mm and all the way down to 0.9-mm pixel pitch. Now we all know that tighter pitch displays are tougher to assemble while still maintaining the uniformity of a seamless display. We also know they can be easily damaged and that many manufacturers are working to make them more robust. And, we also know that we have to use smaller and smaller packages; from 2121 (2.1-mm on a side) LED packages all the way down to 0707 LED packages.
With this trend in tighter resolution I also noticed another trend; the tighter pitch displays are getting dimmer in specified nits, and the display surfaces are getting hotter with the smaller the pitch. I had a chance to measure a few stellar 1.2-mm displays thermally at full brightness, and measured temperature on the surface at over 73 degrees Celsius on both displays. Even though the LEDs are packed tighter, it would seem with the lower level of nits (cd/m2), the displays would be cooler. So what is happening that the surface of the display is a perfect temperature to cook an over easy fried egg (165 degrees Fahrenheit)?