Polarization of LCD
This presentation delves into the fascinating world of polarization,
a crucial element in the workings of liquid crystal displays (LCDs).
SD
by Suyash Dhanwate
Importance of Polarization in LCD Technology
Enhanced Contrast Improved Color Accuracy
Polarization filters block unwanted light, boosting Polarization ensures that light reaching the viewer is
contrast and picture quality. The effect is particularly properly filtered and only passes through the LCD panel
noticeable in bright environments. at the correct angle. This results in more accurate color
reproduction.
Principles of Light
Polarization
1 Understanding 2 Linear Polarization
Polarization
This type of polarization
Light waves oscillate in all restricts light waves to
directions. A polarizer oscillate in a single plane,
filters light, allowing only creating linearly polarized
waves oscillating in a light.
specific direction to pass
through.
3 Types of Polarization
Polarizers can filter light horizontally, vertically, or at an
angle, depending on the application.
Polarizer Construction and
Function
Polarizing Film Light Absorption
Most polarizers are made of The molecules absorb light
thin plastic sheets waves oscillating in one
containing long, aligned direction, allowing only
molecules that filter light. those oscillating
perpendicular to the
molecules to pass through.
Polarization Axis
The direction in which the polarizer allows light to pass is
called the polarization axis.
Liquid Crystal Molecules and
Their Orientation
Liquid Crystals Orientation
Liquid crystals are unique Their molecules can be aligned by
materials with properties of both an electric field, controlling the
liquids and solids. passage of light through the LCD.
Rotation
When a voltage is applied, the
molecules twist, rotating the
polarization of light passing
through them.
Role of Polarizers in LCD
Operation
1 Light from the backlight passes through the first
polarizer, becoming linearly polarized.
2 The polarized light then passes through the liquid
crystal layer, where its polarization is rotated by the
molecules.
3 The light then passes through the second polarizer.
Depending on the orientation of the liquid crystal
molecules, the light is either blocked or allowed to
pass through.
Common Types of LCD
Polarizers
Wire Grid Polarizer
These polarizers use a fine grid of conducting wires to
block light oscillating in one direction.
Sheet Polarizer
Commonly used in LCDs, sheet polarizers are made of
thin plastic films containing aligned molecules.
Liquid Crystal Polarizer
These polarizers use liquid crystals to control the
polarization of light, offering greater flexibility.
Advances in Polarizer Technology for LCD
Displays
Improved Efficiency
New polarizers are designed to increase light transmission efficiency,
1
boosting brightness and reducing energy consumption.
Wider Viewing Angles
2 Advances in polarizer technology allow for wider viewing
angles, providing consistent image quality from different
perspectives.
Enhanced Color Gamut
3 Next-generation polarizers can reproduce a wider
range of colors, delivering richer and more vibrant
images.
