Liquid crystal display digital voltmeter circuit

A liquid crystal display, or LCD (Liquid Crystal Display), is a flat, ultra-thin display device consisting of a certain number of color or black-and-white pixels placed in front of a light source or a reflective surface. LCD monitors are low power consumption and are therefore favored by engineers for use in battery-operated electronic devices. Its main principle is to stimulate the liquid crystal molecules to generate dots, lines and faces to match the back lamp.
Liquid Crystal Display (LCD) may be a new term for many users, but the history of this technology may far exceed our imagination - as early as the end of the 19th century, Austrian Botany The home has discovered liquid crystals, that is, liquid crystals, that is, a substance has both liquid fluidity and some sort of crystal-like alignment. Under the action of an electric field, the arrangement of liquid crystal molecules changes. This affects its optical properties, a phenomenon known as electro-optic effect. Using the electro-optic effect of liquid crystals, British scientists made the first liquid crystal display, the LCD, in the last century.

4-digit LCD digital voltmeter circuit diagram