An electronic device that's used as an effective light source is called light emitting diode or LEDs. These diodes are accustomed to constitute a video display that is known as LED display. LEDs are employed in everyday devices ranging from remote control to traffic lights. LED display can be used in store signs and billboards.

LED panels are used for illumination rather than displaying purposes. An LED panel includes number of LEDs and a typical LED display consists of many LED panels. Surface mounted device (SMD) panel and conventional LED panel are the two classes of LED panels within the market. The conventional panel uses discrete LEDs which are used especially for display screens in large outdoors. Conventional panels tend to be more common in comparison with others and in this sort of panel, the cluster of LEDs of different color are grouped to create a square-shaped pixels used for displaying.

The LED displays which are employed indoors make use of SMD technology. SMD technology utilizes red, green and blue LEDs in panel which are themselves used to create lighting and illumination however, not for display. Pixels are formed mounted over circuit boards and chips. The pixels formed are smaller than a pinhead. Therefore in SMD, the utmost viewing distance is decreased as well as there is slight reduction in the brightness. The both above mentioned featured make the SMD technology better for indoor applications.

The LEDs used to create up an LED display are perhaps one of the most important technologies of electronics. The light emitting diode offers many advantages over other light emitting sources. This diode is made from a semiconductor chip surrounded by the transparent plastic case. The plastic case allows the light to feed it. As positive and negative terminals of the diode is linked to the supply, the electrons starts following through the semiconductor due to its chemical nature. The collision of electrons emits energy by means of photons or light. The emission of different colors including infrared and ultraviolet light depends on the semiconductor material found in the diode.

Nowadays, LEDs are preferred over traditional light sources due to many advantages over them. In traditional light sources a great deal of heat is produced and nearly half of energy is wasted by means of heat. However, LED consumes very less energy and incredibly less amount of heat is produced when compared with traditional light sources. These are the reasons for which the LEDs are used in traffic lights and all other devices.

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