An electronic device that is used as an effective light source is known as light emitting diode or LEDs. These diodes are used to make up a video display that is referred to as LED display. LEDs are employed in everyday devices which range from remote control to traffic lights. LED display can be found in store signs and billboards.

LED panels are used for illumination instead of displaying purposes. An LED panel consists of number of LEDs and a typical LED display consists of many LED panels. Surface mounted device (SMD) panel and conventional LED panel will be the two classes of LED panels found in the market. The conventional panel uses discrete LEDs which are used especially for display screens in large outdoors. Conventional panels are more common compared to others and in this kind of panel, the cluster of LEDs of different color are grouped to form a square-shaped pixels used for displaying.

The LED displays which are employed indoors utilize SMD technology. SMD technology utilizes red, green and blue LEDs in panel which are themselves used to create lighting and illumination but not for display. Pixels are formed mounted over circuit boards and chips. The pixels formed are smaller when compared to 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 probably one of the most important technologies of electronics. The light emitting diode offers several benefits over other light emitting sources. This diode is made of a semiconductor chip surrounded by the transparent plastic case. The plastic case allows the light to feed it. As negative and positive terminals of the diode is connected to the supply, the electrons starts following through the semiconductor because of 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 upon the semiconductor material found in the diode.

Nowadays, LEDs are preferred over traditional light sources because of several benefits over them. In traditional light sources a great deal of heat is produced and nearly 1 / 2 of energy is wasted in the form of heat. However, LED consumes very less energy and very less quantity of heat is produced when compared with traditional light sources. These are the reasons that the LEDs are employed in traffic lights and all the devices.

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