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30-03-2012, 12:08 PM
Post: #1
CHEMISTRY OF LCD
CHEMISTRY OF LCD



.doc  41491961-Lcd-Term-Paper.doc (Size: 1.35 MB / Downloads: 25)


INTRODUCTION :
In this term paper I will tell about what is a lcd, different types of lcd`s.how the lcd`s
wor k.Uses of lcd`s how lcd`s work,their general properties,structures,quality,brief history and
much more about lcd`s.

WHAT IS A LCD ?

liquid crystal display is a thin, flat electronic visual display that uses the light modulating properties of LIQUID CRYSTALS (LCs). LCs do not emit light directly.



WHAT ARE L Q RYSTALS ?
We learned t at t ere are t ree common states of matter: solid, li id or gaseous.
Soli
act
t e way t ey do because t eir molecules always maintain t eir orientation and stay in t e
same position wit respect to one anot er. The molecules in
li i
are just the opposite:
They can change their orientation and move anywhere in the li uid. But there are some
substances that can exist in an odd state that is sort of li e a li uid and sort of li e a solid.
When they ar e in this state, their molecules tend to maintain their or ientation, li e the
molecules in a solid, but also move around to different positions, li e the molecules in a
li uid. This means that li uid crystals are neither a solid nor a li uid. That's how they ended
up with their seemingly contradictory name.


USES & PROPERT ES :
They are used in a wide range of applications including: computer monitors,televisions,
instrument panels, aircraft cockpit displays, signage, etc. They are common in consumer
devices such as video players, gaming devices, clocks, watches, calculators, and telephones.
LC s have displaced cathode ray tube(CRT) displays in most applications. They are usually
more compact, lightweight, portable, less expensive, more reliable, and easier on the eyes.
They are available in a wider range of screen sizes than CRT and plasma displays, and since
they do not use phosphors, they cannot suffer image bur n-in.


QUALITY CONTROL :
Some LCD panels have defective transistors, causing permanently lit or unlit pixels which are
always on or off. Unlike integrated circuits, LCD panels with a few defective pixels are
usually still usable. It is also economically prohibitive to discard a panel with just a few bad
pixels because LCD panels are much larger than ICs. Manufacturers have different standards
for determining a maximum acceptable number of defective pixels.
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Marked Categories : chemistry and lcd, yhs 004, chemistry of lcds, introduction to chemistry of lcd, lcd chemistry, powered by mybb green chemistry, chemistry seminar about the topic liquid crystal, chemistry of lcd crystals, seminar topics lcd, chemistry seminar topics presentation, ppt on lcd crt and plasma displays in cockpit, seminar topics for msc chemistry, seminar topic for lcd, chemistry of liquid crystal, chemistry on lcd, chemistry of lcd, new topics for lcd presentation in chemistry field,

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