What's inside LCD TV's, A Dazzling Technology Indeed

Cross-Sectional View of a LCD TV

Hi friends i hope you had enjoyed the first post from my blog, now prepare yourself for the 2nd post, its is all about LCD TV's. The technology used in the display of small cell phones and laptops is based on the use of liquid crystals- a discovery dating back to the 19th century. This technology has been applied to television sets, causing a revolution in terms of size and image quality. LCD television are flatter and lighter than conventional sets and need less power to operate.


INSIDE THE SCREEN

1

LED BULBS
State-of-the-art screens use diodes, which emit red, green, and blue light. Together these colors form a powerful white light that replaces traditional fluorescent tubes.

2

DIFFUSER
Controls brightness and softens the light.

3

CIRCUITS
Convert the TV signal into electric instructions for the liquid crystal to use in forming the image on the screen.

4

LIQUID CRYSTAL
Discovered at the end of the 19th century, liquid crystals share characteristics of both solids and liquids. Their molecules can have a specific crystalline structure—which is characteristic of solids— but still have some freedom of movement. In LCDs, crystals can be oriented by


  THE PATH OF LIGHT
Image with the help of polarizers, microscopic crystals, and color filters. Much of the process depends on technology that orients the light rays in a precise manner. From an environmental point of view, LCD screens emit almost no electromagnetic radiation, and their energy consumption can be less than 60 percent of what the cathode-ray tube of a conventional television set requires.


INSIDE THE LCD SCREEN

When white light is turned into a TV

1

Source
Sends white light, the waves of which naturally disperse in all directions.

2

First polarizer
Arranges the white light in a series of vertical rays.

3

Thin-film transistor (TFT)
A thin film of crystal, covered in microscopic transistors, which acts according to the TV signal, sending instructions for crystal positioning.

4

Liquid crystal 
Hundreds of thousands of microscopic crystals oriented according to the “instructions” given by the TFT, they interfere with light waves and twist them in specific directions

5

Color filters (Subpixels)
The white light waves twisted by the crystals are transformed into red, green, and blue waves.

6

Passive crystal

7

Second polarizer filters
The light waves in a horizontal direction. The brightness of the subpixels varies depending on the direction given the light waves by the liquid crystal.

8

Antiglare Layer

RED Ray (blocked ray) BLUE Ray (Full intensity ray)


HOW CRYSTAL ACTS