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Compare LED Technology and LCD Technology

  • 18/04/2020
  • LCD and LED are two forms of screen technology that are used sustainably and most commonly in Vietnam and in the world today. So what is the difference between LED and LCD Technology? What factors should we rely on to choose the most suitable technology? In addition, we will specifically analyze some core concepts so that you can have a deeper understanding of LED Technology. All will be mentioned by Hoang Sa Viet in the article below, let's find out!

    LCD And LED Technology Display

    What is LCD Display Technology?

    LCD stands for the English phrase Liquid-Crystal Display, also known as liquid crystal display. As one of the most basic technologies widely applied in the electronics industry such as TVs, tablets, phones,...
    LCD Screen Technologyis composed of many layers with each separate function stacked on top of each other. Here, we will only mention 3 classes with the most important functions for you to understand in the simplest way. The last or second layer is the “Backlight” layer which is composed of many fluorescent lamps that emit white light. This light will go to the "Polarizer" glass, which is capable of blocking or allowing light to pass through to form an image, and then is passed through the "Color Filter" glass with 3 primary colors (Red, Blue). positive and green). Finally, the image will be displayed on the “Display” layer so that we can see it in full color. We can only observe the image displayed on the screen when the "Backlight" layer is active. If the “Backlight” layer can only light up to a certain level, exceeding it will cause damage.

    LCD screen technology
    Structure layers of LCD screen technology (Source: Internet)

    What is LED Screen Technology?

    LED stands for the English phrase Light Emitting Diodes. Unlike LCD Screen Technology, LED Technology displays use light-emitting diodes with 3 RGB primary colors to display images and videos without the need for a white light stream from the "Backlight" layer like LCD. .
    A large LED display is made up of many LED modules combined together. And the LED module is made up of a series of small Led bulbs with 3 basic colors: Red, blue and green with control circuit (EC).
    Note: A diode (Diode) is a specialized electronic device with two electrodes (Anode and cathode), allowing current to flow through it in only one direction and not in the opposite direction.

    Led module and control circuit
    LED module and control board (Source: Internet)

    Outdoor Led Display
    Outdoor LED Display (Source: Internet)

    SEE ALSO: Price list of the automatic Led screen at Hoang Sa Viet company

    Compare LED and LCD Technology

    It is difficult to judge which LED and LCD technology screen is better. So we will give a comparison of the similarities and differences of these two technologies right below to help you refer, choose which one is more suitable for your needs and make a good decision. best, most optimal.

    The same point:

    LCD and LED are the two most popular forms of modern technology today. They all have functions used to display images and videos to convey a certain message to the viewer.
    Capable of customizing the size (LCD applied in video wall TV; LED application creates many different sizes of Led screen, combined with stage decoration in event organization)


    Characteristics LCD LED
    Size According to the manufacturer Customization according to user requirements
    Power Consumption (Compared to the same brightness) Higher power consumption than LED technology screen Save about 40% more than LCD
    Resolution (Same size) High resolution due to high pixel density (Full HD up to 1920 x 1080). Capable of putting multiple pixels. Resolution is lower than LCD due to design peculiarities
    Screen life Only up to about 60,000 hours Almost double the LCD. Up to 100,000 hours, capable of 24/7 operation
    Presentation ability Indoor projection, a "safe" environment because there is no rainproof, waterproof Show both indoors and outdoors. Withstands a wide range of temperatures and humidity
    Environmental friendliness Use mercury. Therefore, the level of environmental friendliness ranks after LED Not using mercury, so it is more user-friendly and environment-friendly
    => This is a very important factor because the trend of environmental protection is getting more and more attention.
    Price Low cost High price

    What is the Newspaper Board?

    Billboards are a form of advertising signs – A big step forward in the advertising industry. They are designed through the colors of small LEDs combined with effects, making the light panels more shimmering and vivid.

    Optical panel
    Newspaper billboards or can be called advertising signs (Source: Internet)

    Initially, the LED color of the light board was mainly red because they were easy to manufacture and cost-effective. However, with the development of technology as well as increasingly demanding aesthetics, today's photovoltaic panels are transformed extremely vividly by diverse colors and beautiful designs. Specifically, in detail about the development of LED screen technology in advertising in particular and the entertainment industry in general, please find out in the sections below to better understand!

    What is RGB Led Module?

    RGB Led is actually 3 normal Led diodes that stick to the beam to create a block and it is the only Led module that can provide all three colors (Red - Red, green - Green, blue - Blue). Led RGB has 4 pins, of which the common 1 positive (Anot) and 3 negatives (Catot) pins represent 3 different colors (Red, green and blue). They can emit light thanks to the semiconductor and emit individual colors or flexibly change colors based on a combination of the 3 primary colors mentioned above. So we can easily understand, the RGB Led module is composed of many RGB LEDs combined together.
    Here is the most basic color mixing table in the RGB LED module:

    Desired color Color to combine
    Yellow Red + Green
    pink Red + Blue
    Violet Pink + lots of blue
    White Red + Blue + Green
    RGB LED bulbs
    RGB LED (Source: Internet)

    But the disadvantage of RGB LED Technology is its large size, which leads to an unsightly LED screen design and, of course, not high image definition. Grasping that problem, the SMD LED module was born.

    >>>>> Learn more: The Secret to Choosing the Right LED Display for Your Needs

    What is SMD Led Module?


    Led SMD stands for the English phrase Surface Mounted Device, which means surface mounted components and is a very commonly used modern technology. This is a technology that uses LED chip eyes directly attached to the printed circuit board of the LED. On LED screens, the SMD chip emits 3 colors on each chip and combines color mixing to create many different colors for more vivid images. So, the LED SMD module is a collection of many SMD LEDs put together.

    Some Popular Sizes

    SMD Led Chip 2020: Length and width dimensions are: 2mm x 2mm respectively
    SMD 2121 LED chip: Length and width dimensions are: 2.1mm x 2.1mm respectively
    SMD 2525 LED chip: Length size, Width is: 2.5mm x 2.5mm
    SMD 2727 Led Chip: Length and width dimensions are: 2.7mm x 2.7mm
    SMD 3528 LED chip: Length and width dimensions are: 3.5mm x 2.8mm

    Types of led chips smd
    SMD LED (Source: Internet)

    Module Led
    Outdoor SMD Led Module (Source: Internet)

    How to Calculate Screen Resolution


    First of all, we need to understand what is the resolution of an LED screen (Display resolution)? Resolution (Display resolution) is the screen size in terms of the total number of pixels (pixels) of an LED screen. For example, 800 x 600 pixels means that the LED screen has a width of 800 pixels and a height of 600 pixels. So if you leave the screen resolution high, it means that the more pixels on the screen, the smoother, more detailed the image will be and vice versa.

    How to Calculate Screen Resolution

    The indicators to pay attention to when determining the LED screen resolution, are:
    Width and height dimensions of the LED display (In mm)
    P (Abbreviated for Pixel Pitch)
    + Pixel: As they are As we all know, the large Led screen is made up of many Led modules combined together. And the LED display module is made up of a series of individual LEDs. These individual LEDs are called pixels (also known as Pixels – the smallest unit on an LED display). A pixel is made up of a group of three LED colors: Red, blue, and green.
    + Pitch pixel: This is the distance from the center to the center of two adjacent pixels (Pixels) and these distances in an LED module are always equal. There are many types of P: P2, P3, P4, P5, P6,... (P is usually measured in mm)

    What are pixels?
    Image Description What is a Pixel? (Source: Internet)

    Pitch Pixel
    Image depicting What is a Pitch Pixel? (Source: Internet)

    Based on the Pitch pixel parameter and the screen size, we can easily calculate the resolution of an LED screen. Here is a descriptive example to make it easier for you to imagine:
    Example 1: P5 screen size (6m x 4m) => Resolution = (6000mm/5) x (4000mm/5)= 1200 x 800 (Pixel)
    Example 2: P2 screen size (6m x 4m) => Resolution = (6000mm/2) x (4000mm/2) = 3000 x 2000 (Pixel)

    At this point, have you clearly seen the similarities and differences of each type of LED and LCD Technology? However, it depends on your intended use to choose the right type of technology. If the purpose is to organize events or install billboards, the LED screen is the most suitable option. Hopefully, the above article has helped you better understand the definition of the most core parts in LED technology screens, giving you more peace of mind when using LED products.