To begin with, it’s important to know exactly what LED and LCD screens are. LCD stands for Liquid Crystal Display, which describes technology where a series of lamps are placed at the back of the screen to produce the images we see.
LED stands for Light Emitting Diode, however, LED screens are actually a type of LCD. The main difference is that LED screens use light emitting diodes, whereas regular LCDs use fluorescent backlights.
Picture Quality
LEDs are popular for their ability to have full array lighting, which is when LEDs are placed evenly across the entire screen, in a similar way to an LCD. However, LEDs have set zones which can be dimmed. This is known as local dimming, and is a feature that can significantly improve picture quality.
If a certain part of the screen needs to be darker, the zone of LEDs can be dimmed to create a truer black and an improved image contrast. Due to the way in which LCD screens are constantly evenly lit, they are unable to do this, resulting in a lower colour accuracy and contrast display.
Pixel Pitch
Pixel pitch is related to optimal viewing distance for your video wall, and determines ow close an individual needs to be in order to clearly make out the content being displayed.
Pixel pitch is the measurement of distance between each pixel in a screen. The lower the pixel pitch, the closer the pixels, resulting in a higher image quality. The higher the pixel pitch, the greater the spacing between the LEDs, resulting in a lower image quality.
A high pixel pitch is especially noticeable in close-up viewing environments, such as a board room or reception. Viewers will begin to see individual pixels rather than a clear and cohesive image.
However, in long distance viewing environments, such as a large billboard in a city centre, a high pixel pitch is more suitable as viewers will be much further away and the pixels will blend together better.
Understanding which pixel pitch you require for your digital signage typically requires input from tech specialists such as the DMS Digital Group, however, there are some calculations you can do yourself to help.
Multiply the pixel pitch of an LED display by 3 to get the minimum distance in feet a viewer must be from the screen to be able to interpret the content.
Multiple the pixel pitch of an LED display by 10 for the ideal viewing experience.
For example, an LED with a pixel pitch of 5mm would require a viewer to be 15 feet away to see any details, and 50 feet in order to get a clear view of the content displayed.
LCD displays have much smaller pixel pitches than LED displays, which makes them ideal for high quality close up viewing in environments such as conference rooms and reception areas.
Size
The location of your digital signage and the size of display needed should be significant considerations when choosing the right screen(s) for your business.
LCD screens are typically smaller than LEDs, which means they’re less suitable for huge video walls. However, depending on the requirement, they can be configured differently. LEDs on the other hand can be as large as you need. One of the largest LED video walls is located in Beijing, measuring a whopping 250m x 30m, made up of five large LED screens to create one continuous image.
Brightness
Consider the installation location and ambient lighting conditions. If you need signage for an outdoor or brightly lit environment, LED displays are typically more suitable due to their high brightness and better visibility in sunlight. LCD displays may be a better choice for indoor settings with controlled lighting conditions.
Carbon Footprint
LED displays are more energy-efficient than LCD displays. LEDs consume less power, resulting in lower electricity costs and reduced environmental impact. If energy efficiency is an important consideration for your business, LED signage may be a better choice.
Cost
LED displays are typically more expensive upfront compared to LCD displays. The cost of LED technology has come down in recent years, but LCD displays still tend to be more affordable. If budget is a significant factor, LCD signage may be a more cost-effective option.