Who Invented the Hot Cathode Tube

In 1913, William David Coolidge revolutionized the field of radiology by inventing what is now referred to as the Coolidge X-ray tube.

Who invented the hot cathode?

It was 100 years ago today that William D. Coolidge first noted in his lab notebook the use of a hot filament as the source of electrons in a high-vacuum x-ray tube.

What is hot cathode display?

In vacuum tubes and gas-filled tubes, a hot cathode or thermionic cathode is a cathode electrode which is heated to make it emit electrons due to thermionic emission. … Hot cathodes typically achieve much higher power density than cold cathodes, emitting significantly more electrons from the same surface area.