A light-emitting diode is an elemental semiconducting light source, which contains one or more light-emitting crystals in one package with one light flux forming lens. The more crystals are there in the package, all other conditions being equal, the brighter and deeper the image is, and the price is higher. Color light-emitting diode contains in one package red, green and blue crystals together; that enables to produce white color and full range of colors through crystal mixing. Basic parameters of diodes are light intensity and viewing angle at half emissive power. Due to use of light-emitting diodes with various light intensity and various viewing angle there are LED screens of different functions and therefore of different prices.
Pixel
Elemental dot (chromatic or monochrome) of image pattern. LED screen resolution, that is the capability to display fine details, is measured by the number of pixels vertical and horizontal. So, for example, the resolution of computer format CGA is 320 x 320 pixels. Each pixel consists of one or more light-emitting elements - light-emitting diodes. A module is a complete display unit, which displays graphic-, video- and alphanumerical data. Each module is packaged with independent power supply and primary control elements. The module is a basic element for building of a big-size LED screen.
