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What is the difference between LED and SMD?
- Sep 01, 2018 -

What is the difference between LED and SMD?


What is LED?

LED (Light EmitTIng Diode) is a solid-state semiconductor device that converts electricity directly into light. The heart of an LED is a semiconductor wafer. One end of the wafer is attached to a holder, one end is a negative pole, and the other end is Connect the positive pole of the power supply so that the entire wafer is encapsulated by epoxy resin. The semiconductor wafer consists of three parts, one part is a P-type semiconductor, in which the hole dominates, and the other end is an N-type semiconductor, mainly electronic here. The middle is usually a quantum well of 1 to 5 cycles. When a current is applied to the wafer through the wire, the electrons and holes are pushed into the vector sub-trap, and the electrons are combined with the holes in the quantum well, and then The form of photons emits energy, which is the principle of LED illumination. The wavelength of light, which is the color of light, is determined by the material that forms the PN junction.

LED characteristics

1, small size

The LED is basically a small chip that is encapsulated in epoxy, so it is very small and very light.

2, low power consumption

LED power consumption is very low, generally the operating voltage of the LED is 2-3.6V. The operating current is 0.02-0.03A. This means that it consumes no more than 0.1W.

3, long service life

At the right current and voltage, LEDs can last up to 100,000 hours.

4, high brightness, low consumption

Less heat radiation than HID or incandescent lamps.

5, environmental protection

LEDs are made of non-toxic materials, unlike mercury-containing fluorescent lamps that can cause contamination, and LEDs can be recycled. Red LED contains a lot of As (arsenic), highly toxic

6, sturdy and durable

The LED is completely encapsulated in epoxy, which is stronger than both the bulb and the fluorescent tube. There are no loose parts in the lamp body. These features make the LEDs hard to damage.

7, strong controllability

Various color changes can be achieved.

What is SMD?

SMD: It is an abbreviation for Surface Mounted Devices, meaning: surface mount device, which is one of the SMT (Surface Mount Technology) components. In the initial stages of electronic circuit board production, via assembly is done entirely by hand. After the first automated machines were introduced, they could place some simple lead components, but complex components still required manual placement for wave soldering. Surface Mounted components mainly include rectangular chip components, cylindrical chip components, composite chip components, and profiled chip components.

SMD features

1. High assembly density, small size and light weight of electronic products. The volume and weight of patch components are only about 1/10 of that of traditional plug-in components. After SMT is generally used, the volume of electronic products is reduced by 40%~60%, and the weight is reduced by 60%. %~80%.

2. High reliability and strong anti-vibration ability. The solder joint defect rate is low.

3. High frequency characteristics are good. Reduced electromagnetic and radio frequency interference.

4. Easy to automate and improve production efficiency. Reduce costs by 30% to 50%. Save materials, energy, equipment, manpower, time, etc.

What is the difference between LED and SMD?

Regarding the difference between LED and SMD, we will conduct a comparative analysis through their application in the display.

First, high-through rate, indoor lighting is not affected, the screen display is perfect

It is well known that SMD's conventional display screens are opaque and can affect building lighting. The transparent LED display adopts the side-emitting display technology, and the light bar is almost invisible to the naked eye from the front, which greatly improves the permeability, and the entire screen display effect is very cool.

Second, lightweight design, saving steel structure costs

SMD's conventional display screen is 42kg per square meter. When the screen area is too large, it is a big challenge to the screen steel structure and the original building structure. The transparent LED display can be mounted stand-alone and without the need for glass. If it is installed behind the glass curtain wall, it can be directly attached to the curtain wall steel structure. Its extremely light weight of 16kg/m2 has a low load demand for the steel structure.

Third, the strip light bar structure, can be shaped design

SMD conventional display screens are limited by the structure of the box when they are shaped products. The stitching profile has a slight defect and there will be seams. The transparent LED display can be customized into a perfect shaped screen, the surface transition is natural and beautiful, and the product screen can support various shapes such as cylinder, round table, triangle, and arc.

Fourth, for outdoor display applications, indoor installation, outdoor viewing

The SMD regular display is installed indoors, blocking sunlight and sight. Transparent LED display for outdoor screen applications, indoor installation, outdoor viewing, no need to worry about waterproof and UV protection, product performance is very stable.

Fifth. Perfectly matched with the glass curtain wall, hidden installation, does not affect the building shape

SMD conventional screens require a large-scale steel frame structure during construction, which is time-consuming and laborious and has a certain impact on the shape and appearance of the building. The transparent LED display can be easily combined with the wall with a small amount of construction during installation, without damage to the wall, and can improve the overall appearance of the appearance.

Sixth, easy to maintain, can support hot swap, light bar maintenance

SMD's conventional screen body has problems, most of which are post-maintenance processing, or the entire module or cabinet is removed for maintenance. The transparent LED display only needs to replace one light bar during maintenance, which is simple and quick to operate and reduces maintenance costs.


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