In this blog post, we’ll explore the advancements in 21st-century display technology and the potential of emerging technologies such as flexible, 3D, and transparent displays.
The Evolution and Significance of Displays
In the movie “Minority Report,” there is a spectacular scene where the protagonist, Tom Cruise, views the predictions of precogs on a screen projected into thin air. He manipulates this screen with ease, moving it around, saving or reading information, and analyzing the images. The technology that makes this spectacular scene possible is none other than “displays.”
The advancement of display technology has driven progress not only in electronic devices such as smartphones, TVs, and cameras but also in the film, military, and medical industries. As screens became clearer and more portable, consumer demand for electronic products increased, and as technologies like 3D displays developed, the quality of service industries—such as the film industry—also improved. It can be said that the advancement of 21st-century display technology has driven progress in engineering, the service industry, and overall national competitiveness. So, what are some of the emerging displays in this crucial field?
Next-Generation Display Technologies
Flexible Displays
Most displays we commonly encounter are rigid and linear, but “flexible displays” break away from this conventional form. As the name implies, flexible displays are screens that can be bent. Unlike traditional displays, which are manufactured using glass substrates, they are made using flexible plastic, allowing the screen to be freely folded and unfolded. Consequently, they are not only more portable than electronic devices based on conventional displays but also more resistant to external impacts, thereby enhancing durability.
Flexible displays differ from conventional displays not only in their glass substrates but also in the physical properties of the components used within them. Broadly speaking, there are methods that utilize organic electroluminescence and methods that utilize electrophoresis using charged particles. Organic electroluminescence refers to the property of organic materials emitting light when an electric current flows through them; it is based on the principle that when a voltage is applied to an organic semiconductor, injected electrons and holes (which can be thought of as the opposite of electrons) emit light as they recombine. This principle depends heavily on the properties of the material. The electrophoretic method utilizes the principle that the direction of charge movement changes depending on the direction of the electric field. When a positive voltage is applied, negatively charged particles move toward the screen’s surface to display color; conversely, when a negative voltage is applied, the particles move in the opposite direction because they share the same charge, thereby displaying the color of the fluid.
The next-generation flexible display sector includes wearable displays that allow electronic devices to be worn on the body, rollable displays that can be rolled up like a roll of toilet paper, and electronic paper (e-paper) that is as thin as paper. Electronic devices utilizing wearable displays have recently been launched by companies such as Google (Google Glass) and Samsung (Galaxy Gear). While these may not yet qualify as ideal flexible displays according to strict definitions, they hold significant importance as early-stage market entries. Although rollable displays and e-paper require further research, they appear likely to eventually replace traditional information delivery media, such as printed newspapers, much like in the movie “Harry Potter.”
Of course, for the flexible display sector to advance further and be fully commercialized in the market, there are still many challenges to overcome, such as the development of various component materials and improving production yields. However, given the extremely rapid pace of technological evolution, the prevailing expectation is that the era of flexible displays will arrive soon.
3D Displays
The “3D displays” mentioned earlier are also one of the hottest fields, just like flexible displays.
Unlike flexible displays, which are still largely in the research phase, 3D displays have become fairly established in the market. Many people are already familiar with 3D through movies. As many of you know, 3D display technology goes beyond the two-dimensional images seen on conventional flat-panel displays to create a sense of depth and vividness that makes it feel as though you are experiencing a real three-dimensional world. While they are commonly seen in movie theaters, the recent launch of 3D smart TVs by various companies has made it possible to experience 3D in ordinary homes as well.
The core of 3D displays is, of course, the method of 3D implementation. Recent implementation methods are broadly divided into the “polarized glasses method” and the “shutter glasses method.” The principle behind the polarized glasses method involves dividing the TV’s scan lines (individual lines formed by rapidly arranging pixels) into even and odd lines, then separating and outputting the video signals corresponding to the left and right eyes for each scan line. This method uses glasses composed of two polarized lenses, each of which allows only one of the two signals to pass through. The shutter glasses method does not divide the scan lines; instead, it alternates the output of images for the left and right eyes at a very high speed. The glasses receive signals from the TV and repeatedly open and close the shutters in both lenses in sync with this alternation.
Of course, 3D displays still have room for improvement. The main issue is “price competitiveness”; they are generally about 1 million won more expensive than standard TVs of similar size and resolution. At domestic electronics retailers, Samsung and LG’s 125-cm and 138-cm 3D TVs are priced between 2 million and 4.5 million won, while 213-cm 3D smart TVs are sold at much higher price points. At a time when a flood of new TV models is hitting the market and skepticism about the practical utility of 3D itself is growing, it remains to be seen whether these prices can significantly stimulate consumer demand. Indeed, a quick online search for 3D TV prices reveals numerous complaints from consumers. Therefore, researchers and manufacturers involved in 3D display technology must carefully consider ways to lower market prices as much as possible.
Other Technologies and Outlook
In addition, active research is underway in areas such as OLED (Organic Light-Emitting Diode) displays—which are key to realizing flexible displays—and transparent displays, which make screens appear to float in mid-air. OLED displays utilize organic materials to provide sharp resolution and screen flexibility. Transparent displays break away from the traditional closed-back design, allowing images to appear as if inside a window while the background remains visible.
For now, conventional displays remain dominant due to limitations in production components, cost, and technological barriers. However, living in the unpredictable world of 21st-century engineering, we can expect that the visual revolution depicted in “Minority Report” will soon become a reality.
