The Cathode Ray Tube (CRT) is a type of monitor that was first discovered in the late 19th century and remained popular for over 70 years. It works by using an electron gun to emit light onto phosphors on the inside of a glass screen, creating vivid colors and detailed images. While CRTs are bulky, power-hungry, and can emit small amounts of radiation, they were less expensive than newer LCD displays and provided good image quality from any viewing angle until being replaced by flat panel displays.

1. CATHODE RAY TUBE
IT PROJECT

2. WHAT IS IT?
• A Cathode Ray Tube is a type of monitor which was first
discovered by Karl Ferdinand Braun.
• It is the most utilized monitor after the flat screen, and has
been popular for over 70 years.
• It is a sturdy, bulky and heavily built monitor.

3. HOW DOES IT WORK?
• The CRT is a glass tube is narrow at one end and wide at
another end. The narrow end has the electron gun which is
emits light on the phosphors (which glow when struck by
light) on the screen, which on the wide end of the CRT.
A Cathode Ray Tube

4. ADVANTAGES
• The CRT has some advantages :
• Creates vivid colors and render detailed images and text.
• Costs much less than their nearest competitors, liquid crystal displays.
• Continues to evolve, with developments such as flat screens and shorter
tube.
• It can be viewed from any angle due to its convex screen, unlike a flat-
screen.
Electron Gun

5. DISADVANTAGES
• It also has disadvantages :
• Large footprint so takes up lots of desktop space.
• Very heavy compared to other monitor types.
• Uses more electricity than LCDs.
• Repairing would cost a lot of money, due to the complexity of the
equipment.
• CRTs emit a small amount of X-ray radiation which can result in a health
hazard.

6. TYPES OF CRT
• There are five types of CRT monitors:
• Cat Eye
• Charactrons
• Nimo Tube
• Williams Tube
• Zeus Thin
Cat Eye
Nimo Tube