In this blog post, we’ll examine the evolution of TV functionality and recent trends, focusing on changes in display technology and smart TVs.

The Everyday Role of TV and Its Historical Evolution

TV is so deeply intertwined with our daily lives that there are almost no people who don’t watch it at all. On the one hand, they are so popular that they have become central to our lives; on the other hand, they face criticism—as reflected in the term “idiot box”—for causing people to become overly absorbed. Since black-and-white TVs first became widespread in the 1950s, televisions have transitioned to color and grown larger; more recently, they have evolved beyond thin, large-screen color TVs to become smart TVs integrated with the internet.
Today’s home televisions go beyond simply receiving broadcasts; they connect to the internet to allow users to watch on-demand replays or use streaming services, and play videos stored on USB drives directly—performing a wide range of functions that far exceed those of the simple receivers of the past. In this way, televisions are evolving to become increasingly “smarter” by incorporating the strengths of other electronic devices.

The Evolution of Display Technology: From CRT to LED

Early TVs were shaped like massive rectangular prisms, and for a time, it was natural to simply refer to them as “boxes.” Over time, TVs have become progressively thinner, and today’s models are generally flat like slabs. This transformation is primarily due to advances in display technology.
The earliest technology used CRTs (cathode-ray tubes), which worked by directing an electron beam onto a phosphor-coated screen to create an image. Later, PDP (Plasma Display) and LCD began to be commercialized. PDP creates colors by inducing an electrical discharge using electrodes in the space between two glass panels, while LCD controls the state of the liquid crystal using electrodes between glass panels, and then expresses colors as light from a backlight passes through a color filter.
Amid this evolution of display technologies, the introduction of LED technology brought about yet another transformation. LEDs offer advantages in terms of structure and light-emitting mechanisms, leading to improvements in screen brightness, thickness, and power consumption.

Principles and Advantages of LEDs

An LED (Light Emitting Diode) is a semiconductor device made from compounds such as gallium arsenide that emits light when an electric current flows through it. Its basic structure consists of a semiconductor region with electrodes attached to the top and bottom; when current flows, electrons and holes (particles considered to carry a positive charge) recombine, emitting photons.
The light-emitting phenomenon occurs when electrons transition from an excited state to the ground state, releasing the energy difference as light; by designing this energy level difference, light of the desired color can be produced. However, since the excited state cannot be easily maintained naturally, energy must be supplied artificially through an electric current.
LED technology offers low power consumption, a long lifespan, and sufficient brightness to produce a crisp picture. Furthermore, because it is more compact than conventional methods, it allows for the production of thin panels, which has contributed to reducing the thickness of TVs. For these reasons, LED TVs are advantageous in terms of energy efficiency and are gaining attention as a technology that can contribute to environmental conservation, particularly in an era of high oil prices or situations where energy conservation is essential.

The Emergence of Smart TVs and Their Key Features

Until just a few years ago, a TV was merely a device that received cable signals transmitted by broadcasters and displayed only predetermined content. However, in line with the era of ubiquitous technology, smart TVs—equipped with processing chips and software to function like computers—have emerged. As a result, TVs have evolved from simple receivers into platforms capable of running a wide range of applications.
Depending on the software installed, smart TVs can perform a wide variety of tasks. For example, you can instantly play videos from storage devices plugged into a USB port, or open a web browser in a corner of the screen to surf the internet while watching TV. You can search for and play videos online, play games, record and save broadcasts, and even rewind a few minutes to rewatch a scene you missed. In this sense, a smart TV feels like a smartphone with a large screen.

Differences in Appearance and Changes in Usability

Since most of a smart TV’s functions are provided via the internet, an internet connection is essential. Because content is downloaded or streamed over the internet rather than via cable, a network connection is a core requirement for smart TVs.
Changes in remote controls and input devices are also noticeable. While traditional remote controls typically only had buttons for channels, volume, and basic screen adjustments, smart TVs often support pointer-style remotes that allow you to move a cursor on the screen or remotes equipped with QWERTY keyboards. These remotes make it easier to search the internet and navigate apps, and changes are also occurring in their design and connectivity—for example, USB ports or computer-style graphics cable ports are being installed in place of traditional analog audio input jacks.

Software-Centric Changes and Future Outlook

The key changes in smart TVs lie in software rather than hardware. Since various applications become possible depending on the platforms and applications provided by manufacturers, new features can be continuously added. While currently used primarily for web browsing and video search and playback, it is highly likely that more apps and services will be developed in the near future, leading to deeper integration into daily life.
Looking at the progress made so far, the emergence of LED technology and smart TVs can be seen as bringing about a level of change comparable to the impact of the transition from black-and-white to color television. On the hardware side, TVs have become more energy-efficient and significantly thinner; on the software side, they have emerged as platforms capable of performing a wide range of functions. As a result, these increasingly “smart” TVs will become even more deeply embedded in our daily lives.
For reference, the initial draft focused specifically on LED and smart TV features, but this article has been revised and organized to explain the overall trend of TV development based on that content.