In this blog post, we’ll explore the evolution of display technology—from black-and-white TVs to transparent OLEDs—and its limitless potential through various examples.
From the first black-and-white TVs of the 1960s, through PDP and LCD, to the 3D TVs that are now gradually gaining traction, display technology has evolved relentlessly alongside the medium of television. Early black-and-white TVs were limited in screen resolution and size, and faced significant constraints in viewing angles and color reproduction. However, as technology advanced, screen sizes gradually increased, colors became more vivid, and screens evolved to be thinner and sharper. In South Korea, in particular, major corporations began investing heavily in the display industry, starting with LG Electronics’ independent development of a 40-inch PDP TV in 1997. As a result, domestic display technology began to gain global competitiveness, and today, the industry holds the world’s leading position in this field, with annual exports of $34.5 billion and a 45.8% global market share.
For decades, the display industry was limited to the TV and monitor markets, but recently, with the widespread adoption of smartphones and tablet PCs, its range of applications has expanded. As these highly portable devices require high resolution and low power consumption, display technology faces new challenges, driving even faster technological advancements. Furthermore, these display devices are expanding into wearable devices such as smartwatches and augmented reality (AR) devices, finding applications in various aspects of our daily lives.
The movie *Minority Report*, often cited when discussing future display technologies, showcases various innovative display technologies such as transparent screens, 3D advertising banners, and display newspapers. The technologies in this film were based on actual research being conducted at MIT at the time, and now, more than a decade after the film’s release, those visions are becoming a reality. Future display technologies currently under development include transparent displays, flexible displays, and ultra-low-cost displays. These technologies are bringing about changes not only in visual enjoyment but also in various aspects such as information delivery, convenience, and creativity.
Transparent displays have long attracted attention due to their unique ability to naturally display information alongside the background. However, commercialization was difficult in the early stages due to high manufacturing costs, low durability, and optical limitations. The widely used LCD (Liquid Crystal Display) technology generates images by controlling the light transmittance of liquid crystals—a substance in a state between solid and liquid. Since it requires a pair of polarizing filters and an optical film, it faced significant limitations in transparency. Additionally, as it is a backlight-based technology, achieving complete transparency was challenging.
However, thanks to the rapid advancements in Active Matrix Organic Light-Emitting Diode (AMOLED) technology, these limitations are gradually being overcome. OLEDs operate on the principle of injecting electrons and holes onto both sides of the organic light-emitting layer, where they recombine within the layer to emit light. Since the organic light-emitting layer is typically transparent, transparent OLEDs can be achieved by using transparent electrodes on both sides. In particular, AMOLED offers lower power consumption and higher resolution compared to PMOLED, making it the primary choice for high-end electronic devices; this technology is playing a pivotal role in driving innovation in the display industry.
AMOLED-based transparent displays have significant potential for application across various industries. For example, in smart home technology, windows made into transparent displays can function as “smart windows” that show weather, time, and news, enhancing the user experience by providing real-time information about both indoor and outdoor environments. Additionally, in the automotive industry, augmented reality displays that show driving information in real time on windshields or side mirrors are being developed, and these could be applied to future vehicles that offer both safety and convenience.
These applications demonstrate that transparent displays can go beyond simply replacing existing display technologies to perform entirely new functions and roles. Furthermore, once transparent displays are commercialized, they are likely to be utilized in various ways across sectors such as education, healthcare, and advertising. For example, in hospitals, a patient’s condition could be displayed in real time on a transparent screen to improve the efficiency of medical staff, while museums and art galleries could adopt new exhibition techniques that transparently display relevant information over exhibits.
Innovative technologies like transparent displays have been showcased at various flat-panel display exhibitions since 2009, and commercialization is expected to be just around the corner. In fact, some market research indicates that full-scale commercialization began in 2024, with the market size projected to reach approximately 32 trillion won by around 2030. Thus, future display technology is not limited to simply increasing screen resolution but is gradually expanding into new areas where displays were not previously used. These changes are expected to go beyond technological innovation and transform the very fabric of daily life.
