Sometimes the consumer electronics industry tries to sell a new technology that consumers thoroughly reject — and as a result, it goes on the trash pile of products that were "before their time," to put it nicely.

Here's a great example: 3D TV, which is officially dead. There are no more major TV-makers that make 3D TVs anymore.

The last two TV-makers to build 3D functionality into their sets, LG and Sony, will not build any new sets this year that can show 3D movies and TV shows, CNET reports.

LG and Sony follow other TV-makers — including Vizio, Sharp, and TCL — that removed 3D technology from their product lines.

In 2010, shortly after the success of "Avatar," the first 3D blockbuster, TV companies started throwing their entire engineering and marketing might behind the 3D tech. But ultimately, seven years later, "3D capability was never really universally embraced in the industry for home use, and it's just not a key buying factor when selecting a new TV," an LG product director told CNET.

Now the TV industry is focusing on 4K, HDR, and smart-TV features as ways to entice buyers to upgrade their sets. In 2012, 3D TVs accounted for 23% of all dollars spent on TVs, according to the NPD Group.

Today, 3D TV is used in the industry as a shorthand warning to those backing buzzy technologies like virtual reality, augmented reality, and wearables: Even if everyone is doing it doesn't mean it will catch on with consumers.

Some possible reasons 3D TV never caught on: