Mobile phones are an inevitable part of our day to lives today. Even then, why do you think people are more comfortable watching shows on Television! Definitely it’s about the experience. It makes us travel the whole world just in a click. This amazing window has made our life very easy. We sit in front of it and we have the whole world in front of us. Undeniably it is of too much importance, but have you ever thought about the working of Television.
Invention of TV
With the first public demonstration on March 25, 1925, this amazing window progressed to another level in very less time. The invention of Television uses the following three processes:-
- The TV camera which converts picture and sound into the signal.
- The transmitter sends a signal from one place to another.
- The receiver receives the signal and converts it back into picture and sound.
Initially, televisions were monochrome which means that they were capable of showing the picture in black and white only. The coloring of its picture is too hard for engineers. It is only possible because of the science of light which tells us that any color can be made from three primary colors of Red, Green, and Blue. But to convert the monochromic into polychromic, engineers needed to develop those kinds of cameras which could capture separate Red, Green and green signal. They also needed to develop those kinds of transmitter and receiver which could transmit and receive the color signal and turn it back into moving picture.
A Look at Working Principle of Television (TV)
There are mainly two types of televisions. One works on Cathode Ray Tube while other is based on Liquid Crystal. The functions of both televisions work in a similar manner. The only difference is of size and picture quality.
Work Principle of Cathode-Ray Tube (CRT) Television
Cathode-ray Tube Television works in total 9 steps, here it is:-
Step 1: Antenna on the roof receives the signal or signal of channel come via cable (for cable TV). These signal are transmitted by transmitter via satellite.
Step 2: The incoming signal gets into the antenna socket which is at the back of the TV.
Step 3: The incoming signal is a mixture of picture and sound of a different program. An electronic circuit inside the Television selects only the program which you want to watch. It splits the signal of the program into separate audio (sound) and video (picture) information and passes each to a separate circuit for further processing.
Step 4: The Electron Gun Circuit divides the video part of the signal into primary color red, blue, and green and passes it to the three separate electron guns.
Step 5 : The circuit flash three electron guns (one from each red, blue, and green) to a Cathode-ray Tube. This tube is like a big bottle made up of glass and has no air in it.
Step 6: The electron beams pass through a ring which is made up of electromagnet. Electrons can be diverted by these electromagnets because they contain a negative charge. The electromagnets hit the electron beams on the screen line by line in back and forth motion.
Step 7: The electron beams pass through the mask. The Mask directs electrons so they hit exact places on the screen of the TV. When the beam of electrons hit the phosphors (colored chemicals) on the screen of the TV, they make dots of different color i.e of red, blue, or green. The left screen remains blind. The mixture of red, blue, and green color dots make a colored picture very fastly.
Step 8: The audio from the incoming signal is passed to the audio circuit.
Step 9: The audio circuit passes the signal to the speaker.
In this way, Cathode-ray Tube Television works. Now, you have a question that how LCD, OLED, and PLASMA Television works? Here is the answer to that
Working of Flat LCD, Plasma, and OLED TV
Nowadays there are very less cathode-ray tube televisions present. They are just replaced by digital one which contains one of these three technology: LCD, Plasma or OLED.
Working of Liquid-Crystal Display Television
LCD (Liquid-Crystal Display) televisions have millions of tiny pixels which are used to produce a picture on the screen. Each pixel is made up of three smaller red, green, and blue sub-pixels. These pixels can be operated electronically to create a picture. Liquid crystal twist or untwist sub-pixels and help them to turn on and off individually. Due to the absence of the cathode-ray tube and phosphor screen, LCD screens are much more compact and energy-efficient than older TVs.
Working of Plasma Television
A plasma screen is nearly the same as LCD, but in Plasma, pixels are replaced by a microscopic fluorescent lamp glowing with plasma. It is a hot gas in which the atoms are blown apart to create negatively charged electrons and positively charged ions. These ions and electrons move freely, producing a blurry glow of light when they collide. Plasma screens can be made much bigger than ordinary cathode-ray tube televisions because it is completely gas, but they are very expensive also. Its contribution is too much on working of TV.
Working of OLED Television
OLED (organic LED) technology is probably the flattest form of TVs. OLEDs work is same as normal LEDs, but they’re made up of organic carbon plastics instead of semiconductors. The display of OLED is very thin (in millimeters), very bright, and uses very less amount of power than an LCD.
These were a few kinds of TV, there is more technology of it Like Quantum LED and many more. They are in process or development and we hope someday we will experience the best version of them. I hope now you know how television works. Must comment which Television you are using and which one you prefer.
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