The cathode ray tube (CRT) TV or conventional TV has a vacuüm tube where the electrons are controlled to display the image. The TV screen is coated with semiconductor material named phosphor. The electrons are emitted from the electron gun. The fired electron heats up the phosphor material and forms the picture. The conventional TVs are large in size and radiates more heat. Conventional TV technology is used in different display units like computer monitors, oscilloscopes, radars, etc. SKB Electronics is best TV repair services in chennai.
Plasma TV displays the image by ionization of gases like xenon and neon. Plasma TV comes with large display and high resolution screens. Due to ionization, it consumes more power. Fast moving pictures can be seen clearly in plasma TV. The depth of colour on a plasma screen is brilliant and High Definition TVs are available with plasma screens.
LCD (Liquid Crystal Display) TV uses LCD technology to create images. A liquid is filled in between two electrodes. When we pass electric current to the electrodes, the crystals in the liquid emits light which in turn forms an image on the screen. The LCD TVs are lightweight and thin when compared to conventional TVs. The resolution of the LCD screen is more and produces more vibrant colours than a CRT TV.
An LED-backlit LCD display is generally called as LED TV. The normal LCD TV uses a cold cathode fluorescent (CCFL) for back lighting whereas an LED TV uses LED lights. As LED consumes less power, the LED TV is cost efficient and eco-friendly. The screen resolution is better in LED TVs. The viewing problem is removed in LED TVs and screen burn out issues do not occur in LED TVs. A true LED with OLED (Organic Light Emitting Diode) screen is superior to LED-backlit LCD display TVs.