At present, display technology has become an integral part of our daily life. It is widely used in smart phones, tablet computers, display screens, televisions, data projectors and augmented reality / virtual reality devices. Liquid crystal display (LCD) and organic light emitting diode (OLED) display are two main flat panel display technologies, but recently Mini led and micro LED are gradually entering people’s vision, because these two displays not only have long service life, but also provide ultra-high brightness, which can significantly improve the dynamic range of liquid crystal display or can be used as solar readable radioactive display. However, challenges such as mass transfer rate and defect repair still exist, which is bound to affect the cost. LED, OLED and micro led who will become the last king has become a hot topic.
Recently, a group of scientists led by Professor Shin TSON Wu of the school of Optics and photonics of the University of Florida published a paper in the journal light: Science and application, which comprehensively analyzed the performance of micro led, led, OLED emission display and Mircro LED backlight liquid crystal display. The team deeply evaluated the power consumption and environmental contrast of each display, and systematically compared the dynamic range, moving picture response time, color gamut and adaptability to flexible and transparent displays. The advantages and disadvantages of micro led, led and OLED displays are analyzed, and their future prospects are discussed.
Professor Wu’s research team has been committed to display technology for decades, from traditional liquid crystal displays, OLED displays, quantum dot displays to emerging micro LEDs and LED displays. He said: “Each display technology has its own advantages and challenges: traditional LCD has long life and low cost, but its contrast and flexibility are limited. Although OLED displays provide unprecedented dark and ultra-thin shapes, their life and aging problems still need to be solved. Recently, micro LED is expected to provide flexible transparent displays with high brightness, long life and high compatibility, but the size of the chip is not efficient It should lead to performance problems when they act as high-resolution density AR / VR displays. In addition, micro LEDs have shortcomings such as low production and high cost. Technological development and manufacturing preparation lag behind the development of new methods. Our purpose is to understand the basic limitations of various displays and develop new methods for each technology to overcome their obstacles. “
Researchers considered several important performance indicators: (1) dynamic range and environmental contrast; (2) Resolution or high pixel density to minimize screen effect; (3) Wide color gamut; (4) Wide viewing angle and color deviation; (5) Dynamic image response time for suppressing image blur; (6) Power consumption; (7) Lightweight system; (8) Cost.
“After investigation, we found that all these display technologies support superior performance under the above standards except for some tradeoffs: (1) in order to achieve high brightness in high dynamic range, micro LEDs and LCDs need careful temperature management, while OLEDs need to sacrifice part of their service life; (2) Transparent displays are not the best stage for non radioactive liquid crystal displays. (3) Power efficiency and environmental contrast depend on the size of Mircro LED / LED / OLED chip. In order to achieve the same environmental contrast, micro LED backlight LCD needs to achieve the same power consumption as OLED display, and the efficiency of non polarized micro LED / LED radioactive display is expected to be increased by three times in the future. “
The researcher predicted: “in the next few years, OLED will continue to grow in the smartphone market, and micro led backlit LCD will enter the fields of tablet computers, game monitors, computers and televisions. With the gradual maturity of technology, micro led and led radial displays may gradually move to the central stage in the near future, because their cost becomes more acceptable.”