Instead, a line printer was the primary output device, while the monitor was limited to keeping track of the programme's operation. As early monitors were only capable of displaying a very limited amount of information, and were very transient, they were rarely considered for programme output. This allowed the engineers operating the computer to monitor the internal state of the machine, so this panel of lights came to be known as the 'monitor'. The common aspect ratio of televisions, and then computer monitors, has also changed from 4:3 to 16:9 (and 16:10).Įarly electronic computers were fitted with a panel of light bulbs where the state of each particular bulb would indicate the on/off state of a particular register bit inside the computer. From the 1980s onward, computers (and their monitors) have been used for both data processing and entertainment, while televisions have implemented some computer functionality. Originally, computer monitors were used for data processing while television receivers were used for entertainment. The display device in modern monitors is typically a thin film transistor liquid crystal display (TFT-LCD) thin panel, while older monitors used a cathode ray tube (CRT) about as deep as the screen size. The monitor comprises the display device, circuitry and an enclosure. A monitor or a display is an electronic visual display for computers.
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