Information Display最新文献

DISPLAYS UTILIZING OLED TECHNOLOGY ARE KNOWN for their vivid colors, high contrast ratios enabled by true black, and low power consumption. These advantages have enabled incredible picture quality across the consumer electronics landscape and long battery life for mobile devices.

Many of us interact with OLED displays every day, and that human element is what excites me as a researcher—to pursue the latest and greatest in OLED technology. OLEDs have proliferated in recent years, driven in large part by the commercialization of high-efficiency phosphorescent emitters that convert injected charges with near-unity efficiency into light within the device. Subsequent light extraction plays an important role not just in the device's overall brightness and operational stability, but also in the perceived color and intensity as a function of the user's interaction angle with the display. This latter point is becoming more critical as OLEDs expand into—and enable—new applications in automotive, information technology, flexible displays, and more.

With that in mind, this issue of Information Display will dive into three articles on new OLED applications and one article on research pushing to change the basic physics of high-efficiency OLEDs.

ADMESY WAS FOUNDED IN 2006 BY THREE FORMER PHILIPS ENGINEERS—Ruud Bouten, Marcel Janssen, and Peter Franssen—from the Philips Mobile Display Department that produced displays for phones. While active in creating display testing solutions, they noticed that if you make displays in volume, there is a need for test/calibration on color and light, because the color would deviate and lead to a displeasure with the image.

In the past, people could adjust aspects (such as color and brightness) on older TV models themselves until they were happy with the image. But on mobile phones and devices, there was a clear need for calibration. And with the sheer volume of phones the industry was beginning to produce, this was not possible.

The idea for a company came through “frustrations” from the engineers who could spend weeks setting up factories, only to have someone “bump” something and affect the settings. Could they create a company making measurement equipment for use in a production line or lab? This as a market was not “major” enough for Philips (who only had minor internal measurement equipment at that time), so Bouten, Janssen, and Franssen set the groundwork to begin their own company, now known as Admesy.

Inside laboratories, spectrometers and measurement systems could calibrate displays with accurate precision. But the three engineers noted that when they would implement similar measuring techniques in production lines or factories, the equipment's reliability was not effective in these settings. They would fly to China or Korea to set up production lines, install the instruments similar to the ones used in their lab, and arrive back home, only to get a call a week or two later that someone disturbed the settings on the spectrometer, so they would need to schedule a return visit.

The engineers noticed two approaches in measurements. One was utilizing accurate spectrometers and colorimeters used in the engineering lab, but if you placed them in a production line, the different environment and users would cause it to break. And it often was too slow or expensive. The second one was using more affordable, less accurate colorimeters, usable in the production line, but its accuracy was not sufficient. The goal was to achieve the necessary level of accuracy but in a form factor that was robust and efficient enough for a production line application.

They began by attracting investors in 2006–2007. They worked for Philips during the day, and designed their products in the evening. By 2008, everyone had quit their daytime jobs, and they hired their first mechanical engineer. Initially the new business grew, but not quickly. Larger potential customers were understandably skeptic when considering a small, four-person start-up company in the Netherlands. So Admesy began with smaller projects (measurement systems for LED lights and carpets, reflectance measurement for gloss) that involved niche measurement equipment. They