ABSTRACT
The cathode ray tube (CRT) is a luminescent display invented by K F Braun in 1897. The display, which
is inexpensive but can show resolute pictures on its screen, has been the leading technology in the
display field over more than 100 years. But the heavy weight and long depth are the CRT’s weaknesses.
The liquid crystal display (LCD) and other new flat panel displays that have no weaknesses as such are
expanding their market share in recent years.