As time has passed and everything has evolved so did the signages. Signages are actually the collection of various signs which are used to communicate and deliver messages to a specific group. The signages have now developed in to electrical signage.
Digital signage is a sub-section of electrical signage. Digital signage use various technologies which include LED (Light Emitting Diode), LCD (Liquid Crystal Display), and projection to display digital images, videos, web pages, whether data, important messages, restaurants and cafeterias menus, and simple text.
The use of digital signage is increasing day by day. They can be seen both indoors and outdoors. The digital signage are used for advertisement purposes in the shape of billboards and banners. LED display screens are the best options while using digital signage for advertising because they emit light in such amount that it captures people’s attention. Digital signage is a centrally controlled content distribution platform. Such digital signage which are used for advertising are based on LED screens and are controlled by a computer and change on its command.


LED (Light Emitting Diode)

The LED (Light Emitting Diode) is a flat screen, flat panel computer monitor, or television. It has a very short depth and is light in terms of weight. The main difference between LED and a typical LCD monitor is the backlighting. An LED display or light emitting diode is a flat panel display that uses light emitting diodes as the video display. An LED display panel can be either a small display or a part of a larger display. LED diodes are used in order to make up an LED display.


SMD (Surface Mounted Device)

SMD stands for Surface Mounted Device. It is one of one of the two types of LED panels. The other type is called discrete panels. The main difference between two is in the way there light emitting diodes are placed on the chip board. SMD technology consists of visually regrouping the three leds in to a single point of white or black color. That is why SMD technology is better than discrete panels. Digital signages with LED and SMD screens are been used worldwide for the sake of advertising. Even countries like Pakistan are advanced enough to use digital signage. For instance: Lahore, one of the most historic cities of Pakistan is flooded with digital signage.
There have been more than 500 installations recently, which made the historic city, the city of lights. It has become the most digital city recently, and the quantity of digital signages bearing LCD and SMD screens is increasing every passing day. These digital installations include digital billboards, pole signs, and banners.

The sizes of the billboard installation vary from 10 by 20 to 10 by 30 to 15 by 45 and 20 by 60 in the form of hoardings. When it comes to pole signs and stadium displays the size is about 6 by 3. Other popular digital signage include a shopping mall, super markets, and waiting areas etc.