Elements of VMS (DMS) optical system
LED is abbreviation for light-emitting diode. A diode is an electrical component with two terminals which conduct the electricity only in one direction. You can imagine LED as a tiny light bulb that fit easily into an electrical circuit. They are illuminated solely by the movement of electrons in a semiconductor material. In an incandescent bulb the filament is heated to produce light. So, unlike ordinary incandescent bulb, LEDs don't have a filament that will burn out. That makes them highly efficient and durable light source.
Different types of LED’s are used in today’s LED displays. One common thing for all of them is that they emit light in rounded cones. The angle of the cones is different (30 degrees, 60 degrees, 120 degrees).
The most important fact that determines the level of efficiency between different displays is that emitted light is not focused to NEMA/EN12966 bean widths (cone of vision) but to all directions.
An optical lens is a device which transmits and refracts light, converging or diverging the beam. The purpose of the lens is to focus scattered LED light into a shape that corresponds to standard’s beam width. The lens increases efficiency of the LED display because it maximizes use of LED light for intended purpose. It doubles, even triples efficiency of the sign and that way reduces power consumption.
Graphically presented, it turns this:
The lens creates optimal light pattern
It is obvious from the images that most of the LED light is wasted without the lens.
Optical system is composition of LED, LED lens and signs front face (primarily front face paint). Those three elements determine efficiency of LED sign in terms of optical performance and energy consumption.
Pixel or also known as a picture element is a physical point in a raster image, or the smallest addressable element in a display device. It is the smallest controllable element of a picture represented on the screen. By controlling the pixels various characters and pictures can be displayed on the screen. They can consist of a single LED or multiple LEDs.
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