What Does Backlight Mean?
Backlight is a category of illumination used in monitors utilizing liquid crystal display (LCD) technology. Liquid crystal display monitors cannot produce light by themselves, and must depend on light sources to provide visible images. Apart from being used in computer displays, LCD televisions and smartphones, backlights are also used in small displays such as wristwatches and pocket calculators for improving the readability in low-light conditions.
Techopedia Explains Backlight
Unlike front lights which illuminate from the front, backlights usually produce illumination from the sides or from the back of the screen. Most liquid crystal display screens consist of several layers, with backlight being the layer farthest back. The light valves help in changing the amount of light reaching the human eyes, usually by blocking light’s passage with the help of a polarizing filter.