Differentiate LCD and LED monitors

Differentiate LCD and LED monitors. Explain with the help of suitable examples.

Differences between LCD and LED are important to understand as they are both very co-related and it is possible to get confused between one and the other. LCD is the abbreviation for liquid crystal display while LED is the abbreviation for light-emitting diodes. They differ from one another in the fact that LCDs usually use fluorescent lights while lights use light-emitting diodes.

The structure of both LCD and LED is quite the same as the technology behind these screens is the same. The differing television types have two different layers of polarized glass and through this glass, the liquid crystals get blocked as well as pass the light. Thus, this is one of the key differences and similarities between LCD and LED.

LCD Vs LED

The table given below lists the differences between LCD and LED. In short, knowing about LCD Vs LED will help to a greater extent.

Difference between LCD and LED

LCD LED
LCD stands for liquid crystal display. LED stands for light-emitting diodes.
All LCDs are not a subset of LED TV. All LEDs are a subset of LCD TV.
LCDs primarily use fluorescent lights. LEDs use light-emitting diodes.
Fluorescent lights used are usually placed behind the screen. Light-emitting diodes are usually placed behind the screen or around the edges.
LCDs are usually thicker and lack energy efficiency compared to LEDs. LEDs are much thinner and are much more energy-efficient.

 

If you liked this article and would like to read more articles related to education, do One of the major differences between the LED and the LCD is that the LED uses the PN-Junction diode which emits light when the current passing through it, whereas LCD uses liquid crystal or plasma for visible light emission. The liquid crystals are filled between the glass electrode and when the power is applied across it, the liquid crystal becomes energized and emits light. The other differences between the LED and LCD are shown below in the comparison chart.

The LED and LCD both are used for displaying the images and texts. The LED uses gallium arsenide and gallium phosphide which when heated emits visible light. The LED is used for showing the numeric and alphanumeric characters. On the other hand, the LCD has a thin layer of liquid crystal filament between the glass electrodes. When the power is applied across the electrodes, they start emitting light energy in the form of photons. The LCD displays the text or images in the form of a dot matrix and segments.

Comparison Chart

Basis For Comparison LED LCD
Definition PN-Junction devise which discharges visible lights when an electrical charge passes through it. It is an optical device used for displaying information in the form of text and images.
Stand For Light Emitting Diode Liquid Crystal Display
Backlight No backlight Cold cathode fluorescent lamp provides backlight.
Resolution High Low
Power Requirement More Less
Display Area Small Large
Cost High Low
Material Gallium arsenide phosphide. Liquid crystals and glass electrodes.
Switching Time Fast Slow
Direct Current Do not effects. Reduces Life Span
Contrast Ratio Low High
Mercury Not used Used

Definition of LED

The full form of LED is Light Emitting Diode. The LED is a PN junction diode that emits light when an electric current flows through it in the forward direction. The LED is constructed by doping the p-type and n-type material. When the power is applied across the LED the recombination of P-type and N-type material charges takes place. The recombination of charges gives energy in the form of heat and light.

The semiconductor material is translucent (allow light to pass) and it emits light through their junction. The semiconductor material used galvanized arsenides, which generates red or yellow light. It is also available in green, red, and amber colors. Several LED is used for representing the one segment and the decimal points are represented by the single LED.

Definition of LCD

The LCD is used for displaying the texts and images in the form of a dot matrix or segments. The LCD has liquid crystal filament which is filled between the transparent electrodes. When the current passes between the electrodes, the filaments become energized and emit visible light.

The construction of the liquid crystal display is shown in the figure below. The liquid crystal used in the display has the property of both the solid and the liquid. When the potential is not applied across the liquid crystal, it becomes transparent but after activation, the crystal scatters light in all directions and appears to be bright.

The LCD consumes less power and also has seven-segment displays. But it is a slow device and requires more time for switching. The dc reduces their lifespan and hence mostly they are used with AC having a frequency less than 500 Hz.

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