TV Screens

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TV Screens (LCD, Plasma, CRT)

CRT Screens:

CRT stands for cathode ray tube. In CRT screens, the display is made of thousands of beams of electrons, being shot through a tube to produce a pixel. The intensity and focus of the ray creates the color and image that appears on the screen. 


PAST: In the past, CRT screens were the first tv screens and were very popular as television diffused around the world. 


PRESENT: Presenty, CRT screens are outdated and inefficient compared to Plasma screens and LCD screens, although your grandma might still own one.


Future: CRT screens will be irrelevant in the future, they are bulky, heavy, and use materials unsafe for waste.

Chemical Properties:


- Flammable

- Toxic when wasted innappropriately

Physical Properties:


- Not Elastic

- Moderate Viscosity

Plasma Screen:                         LCD Screen:

  • Plasma Screens are screens work by lining up thousands of cells of neon and xenon gas next to each other in between two plates of glass. 

  • Electric currents from an outlet allows for electrons to be shot into the cells of gas

  • When shot through the different cells the gases display the electrons in different colors depending on the heat and strength of the electron beam.

PAST: The plasma screen was created in 1964, but the model at the time was too expensive for most consumers, so it would need to wait 5 decades.

Present: Presently, plasma screens are the most popular tv screens in the world. It shows the greatest quality of picture (HD), and is extremely thin.

Future: In the future Plasma screens are going to be very popular in virtual reality as it increases in popularity. Virtual reality requires plasma screens other than LCD because the image has to look extremely realistic from a short distance away.

Chemical Properties: 


-  Slightly Flammable


- Toxic when wasted innappropriately

Physical Properties: 


- Not Maleable


- No Flexibility

  • LCD screens have liquid crystals that make up each pixel. 

  • When electronic currents hit these crystals at different temps and strengths, they can melt the crystal to create different kinds of light.

PAST: LCD screens on tvs are relatively new, but they used to be only used in things like calculators and stopwatches.

Present: LCD screens have been significantly improved and are now some of the most innovative and popular displays in televisions.

Future: In the future, LCD screens will be the most popular because they are affordable, light, thin, and show increasingly good display.

Chemical Properties:

- Flammable

- Toxic when wasted inappropriately

Physical Properties:


- Not Flexible


-No Smell


Interesting Facts

  • The first TVs were actually displayed in Black and White... can you imagine?
  • In 2010, the world's largest plasma tv screen was 152 inches, today, the largest plasma screen is over 300 inches

Citations

http://www.madehow.com/volume-1/liquid-crystal-display-LCD.html 

http://www.madehow.com/Volume-2/Cathode-Ray-Tube.html

http://www.digitaltrends.com/home-theater/lcd-vs-plasma-tvs/ 


That's a wrap
Created By Osora Ifesinachukwu and Joey Hatch