Trinitron

Trinitron is a brand name of the Japanese electronics company Sony. It refers to a specific type of picture tube, that is, the deep glass bodies that produced the image in old televisions. Such devices were not flat but box-shaped toward the back and often weighed more than 30 kilograms. Sony introduced the technology in 1968, and it was considered the best of its kind for decades. Trinitron images were brighter and appeared more vivid in color than those of the competition. The last units rolled off the production line in 2008, with more than 280 million sold in total.

Why Sony shook up the television market with it

Before Trinitron, an American technology called Shadowmask dominated the color television market. With it, a thin metal plate with millions of tiny holes sits behind the display surface. This plate sorts the light beams but absorbs a large portion of the energy in the process. The result was comparatively dark, dull images. Sony replaced the perforated plate with a grid of fine vertical wires that lets significantly more light through.

The difference was visible to every customer in the store, without needing to understand the technology. A Trinitron next to an ordinary television simply looked brighter. Sony was therefore able to charge higher prices, and did so. The success turned the company from a mid-sized manufacturer into a global brand. In 1973, Sony even received an Emmy Award for Trinitron, which is unusual for device technology.

For economic history, Trinitron is a textbook example of how a technological edge can carry a brand. The patent protected Sony from direct copies until the mid-1990s. When the protection expired, competitors quickly caught up. Shortly afterward, the shift toward flat screens began anyway.

A grid instead of a perforated plate

At its core, a picture tube works like a cannon for electrons, that is, tiny electrically charged particles. These particles fly from back to front and strike the inside of the display surface. There, a coating is applied that lights up on impact. There are three types of phosphor: one glows red, one green, one blue. Every image is created from the mixture of these three colors.

So that a red beam does not accidentally hit a green dot, a sorting aid is needed. In Trinitron, this is the construction called the aperture grille: hundreds of extremely thin, vertically stretched metal wires. They cover less area than a perforated plate, which is why more light gets through. In addition, Sony combined the three electron guns into a single component instead of three. This made alignment more precise and the center of the image sharper.

This design had a visible cost. The stretched wires must be secured against vibrations, otherwise the image would shake. For this, Sony stretched one or two horizontal stabilizing wires across the surface. On bright image content, they were visible as fine dark lines. Many owners considered this a defect, even though it was inherent to the design.

From the living room to the retro shelf

In the 1980s and 1990s, a Trinitron stood in many living rooms. Later, the technology also conquered desktops: computer monitors under names such as Sony GDM or Mitsubishi Diamondtron used the same principle. In photo studios and television newsrooms, these monitors were long regarded as the reference for color accuracy. Anyone serious about image editing worked on such a device.

Today, the term is mainly encountered in two contexts. First, in retro gaming: old game consoles were developed for picture tubes and often look better on them than on modern flat screens. Well-preserved Trinitron devices are therefore traded second-hand at surprisingly high prices. Second, in economic analyses, where Trinitron serves as an example of how a dominant technology can become worthless within just a few years.

A common misconception is that Trinitron was its own television standard. That is not true: it was only about the construction of the tube, not the signal. A Trinitron received the same broadcasts as any other television. The difference lay solely in how the image was made visible.