Display Technology

On January 23, 1997, at approximately 2 AM in a windowless basement laboratory at MIT, two undergraduate students achieved something that experts had declared impossible. Barrett Comiskey and JD Albert placed a microcapsule between two copper electrodes, slid it under a microscope, and watched as an external electric field moved particles inside the capsule for the first time. They had just proven that electronic ink could work. The technology they developed that night would eventually power millions of e-readers, electronic shelf labels, and digital signage displays worldwide. But what makes e-ink fundamentally different from every other display technology? The answer lies in the physics of moving actual particles through fluid—a mechanism so elegantly simple that it took a decade for commercialization to catch up with the concept. ...

In 1965, a British engineer named E.A. Johnson published a short article describing something that would eventually become ubiquitous: a finger-driven touchscreen. Working at the Royal Radar Establishment in Malvern, England, Johnson had designed a capacitive touch panel for air traffic control systems. The idea was simple yet revolutionary—instead of typing coordinates or manipulating physical controls, operators could simply touch the screen to interact with radar displays. Nearly six decades later, capacitive touchscreens have become so commonplace that we rarely think about the sophisticated physics operating beneath our fingertips. Every tap, swipe, and pinch gesture relies on an invisible grid of thousands of microscopic capacitors, scanning at hundreds of times per second, measuring changes in electric fields smaller than a picofarad. ...

In 1931, a group of scientists gathered in Cambridge, England, at a meeting of the International Commission on Illumination (CIE). They had spent years analyzing data from color matching experiments conducted by William David Wright and John Guild, who had asked human observers to match monochromatic colors by mixing red, green, and blue lights. The result of that meeting—the CIE 1931 color space—revealed something unsettling: the shape of human color perception is fundamentally incompatible with the triangle-based color systems used by every display today. ...