LCD TV work on the principle of _____

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RRB ALP CBT 2 Electronic Mechanic Previous Paper: Held on 23 Jan 2019 Shift 1
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  1. emission of cathode rays and light 
  2. emission of cathode rays
  3. light emission 
  4. light blockage 

Answer (Detailed Solution Below)

Option 4 : light blockage 
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Nowadays, from phones to TVs, the screens used could be either a display based on OLED (Organic Light-Emitting Diode) technology or LCD (Liquid Crystal Display) technology.

Liquid Crystal Display:

  • LCD stands for “Liquid Crystal Display”.
  • It is a combination of two states of matter, the solid and the liquid. LCD uses a liquid crystal to produce a visible image.
  • LCD’s technologies allow displays to be much thinner when compared to a cathode ray tube (CRT) technology.
  • It is composed of several layers which include two polarized panel filters and electrodes.
  • These screens work on the principle of blocking light rather than emitting light. LCDs require a backlight as they do not emit light by them.
  • Most of electronic devices mainly depend on liquid crystal display technology for their display.


Hence, it can be concluded from the given points that the acronym LCD stands for Liquid Crystal Display.

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