LED AND LCD SCREENS
LCD Screens
 LCD stands for Liquid Crystal Display/Diode
 LCD screens are made from millions of tiny blocks called pixels.
 Each pixel contains a red, green and blue light filter which can be
individually adjusted to create any colour when combined.
 This is possible because the liquid crystals found in each pixel can be
manipulated to allow all, some or none of the fluorescent tube back
light through to the individual RGB filters at the front of the screen.
LED Screens
 LED stands for Light Emitting Diode
 LED screens work in a similar way to LCD screens but with one major
difference, the light source.
 Small LED bulbs are used to provide light to the LCD pixels, not
fluorescent tubes.
 These LED bulbs either fill the entire back of the display unit, or on
thinner models are just arranged around the edges.
 A fully back lit LED display allows for localised diming of the screen,
producing deeper blacks in parts of the screen where no light is
needed.
 Edge lit LED displays allows the screens to become even thinner than
standard LCD displays.
LCD & LED Flat Display Screens
What is a display screen?
 Display screens are amongst the most common types
of output device.
 LCD technology has made the display screens require less
power and are lighter and thinner than their obsolete
CRT Screens.
 LCD screens produce sharp high resolution images.
 Most display screens are either LCD or LED.
Typical applications for display screens
 Phone and tablets
 Laptops and computer screens
 Televisions
 Gaming devices
 Cameras
 Household appliances
Benefits of display screens
 Low power consumption means that displays can be placed on
battery powered devices
 Screens are now lighter and thinner – meaning they can be used in
a variety of places
 Sharp high resolution images
 Vivid colours with good contrasts
 Reach maximum brightness quickly
 Reliable and long lasting
Drawbacks of display screens

Keeping up with the absolute latest screen technology can be
expensive.