Commercial matrix displays include any type of display used in commercial applications. There are two types of matrix displays. They are passive matrix displays and active matrix displays. Passive matrix displays are common types of flat-panel displays consisting of a grid of horizontal and vertical wires. At the intersection of each grid is an LCD element, which constitutes a single pixel, either letting light through or blocking it. A higher quality and more expensive type of display, called an active-matrix display, uses a transistor to control each pixel. An active matrix display is a type of flat-panel display in which the screen is refreshed more frequently than in conventional passive-matrix displays. The most common type of active-matrix display is based on a technology known as Thin Film Transistor (TFT). The two terms, active matrix and TFT, are often used interchangeably. Modern commercial matrix displays use active matrix liquid crystal displays (AMLCD), which provide a much brighter and sharper display.