Thursday, 3 May 2018

Full Form Of LCD And How Does LCD Screen Work??

Full Form Of LCD And How Does LCD Screen Work?? 



All About The LCD Screen And How Its A Useful In The real Life Application And Also Its Applications!!!



A Liquid Crystal is a state of matter between a solid and a liquid. The characteristic feature o liquid crystal is its long cylindrical molecules.


The alignment of molecules can exist only over a limited Temperature Range of 0-50°C with most available devices.



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Liquid Crystal Displays (LCDs) are used in similar applications where LEDs are used.

These applications are display of numeric and alphanumeric characters in dot matrix and Segmental Displays.


LCDs are of two types-dynamic scattering type and Field Effect type.


The dynamic scaruering liquid crystal cell is constructed by layering the liquid crystal between glass sheets with Transparent Electrodes deposited on the inside faces.






The liquid crystal material may be one of the Several Organic Compounds which exhibit opucal properties of a crystal, though they remain in liquid form.

When a Potential is applied across the cell. charge carriers flowing through a liquid disrupt the molecular alignment and produce turbulence.

When the liquid is not activated, it is transparent.



When the liquid is activated, the Molecular Turbulence causes light to be scattered in all directions and the cell appears to be bright.


The phenomenon is called dynamic scattering

The construction of a field effect liquid crystal display is similar to that of the dynamic scamering type, with the exception that two thin polarizing optical filters are placed at the inside of each glass sheet.


The liquid crystal marerial in the field effect cell is also of different type from that employed in the dynamic scattering cell.


The material used is twisted nematic type and it actually twists the light passing through the cell when the latter is not energized. 


This allows the light to pass through the optical filters and the cell appears brigh. when the cell is energized, no twistng of light takes place and the cell appears dull.

Liquid crystal cells are of two types - transmittive type and reflective type.


In the transmirtive type cell, both glass sheets are transparent so that hght from a rear source is scattered in the forward direction when the cell is activated.

The reflective type cell has a reflective surface on one side of the glass sheets. The incident light on the front surface of the cell is dynamically scanered by an activated cell. Both rypes of cells appear quite bright when activated even under ambient light conditions.



The liquid crystals are light reflectors or transmiaers and therefore, consume small amounts


The Advantages of LCDs are low power consumption and low cost.


The disadvantages than they occupy a large area and their operating speed is low. LCDs are normally used for seven segment displays.



Question part :

1)What is a full form of LCD?? 
Ans:Liquid crystal displays (LCDs)

2)How manny types of LCD?? 
Ans: LCDs are of two types-dynamic scattering type and field effect type.

3)which type of applications where we used a LCD?? 
Ans:Liquid crystal displays (LCDs) are used in similar applications where LEDs are used. These applications are display of numeric and alphanumeric characters in dot matrix and segmental displays.

4)Advantage of LCD?? 
Ans:The advantages of LCDs are low power consumption and low cost. The disadvantages than they occupy a large area and their operating speed is low. LCDs are normally used for seven segment displays



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