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computer monitorscomputer monitorA computer display monitor, usually called simply a monitor, is a piece of electrical equipment which displays viewable images generated by a computer without producing a permanent record. The word "monitor" is used in other contexts; in particular in television broadcasting, where a television picture is displayed to a high standard. A computer display device is usually either a cathode ray tube or some form of flat panel such as a TFT LCD. The computer monitor comprises the display device, circuitry to generate a picture from electronic signals sent by the computer, and an enclosure or case. Within the computer, either as an integral part or a plugged-in interface, there is circuitry to convert internal data to a format compatible with a computer monitor. computer monitor As with television, several different hardware technologies exist for displaying computer-generated output: Liquid crystal display (LCD). TFT LCDs are the most popular display device for new computers in the Western world. Passive LCD gives poor contrast and slow response, and other image defects. These were used in some laptops until the mid 1990s. TFT Thin Film Transistor LCDs give much better picture quality in several respects. All modern LCD monitors are TFT. Cathode ray tube (CRT) Standard raster scan computer monitors Vector displays, as used on the Vectrex, many scientific and radar applications, and several early arcade machines (notably Asteroids - always implemented using CRT displays due to requirement for a deflection system, though can be emulated on any raster-based display. Television receivers were used by most early personal and home computers, connecting composite video to the television set using a modulator. Image quality was reduced by the additional steps of composite video ? modulator ? TV tuner ? composite video. Plasma display Surface-conduction electron-emitter display (SED) Video projector - implemented using LCD, CRT, or other technologies. Recent consumer-level video projectors are almost exclusively LCD based. Organic light-emitting diode (OLED) display Penetron military aircraft displays Wiki computer monitorEnvironmentalismEnvironmentalism is a broad philosophy and social movement centered on a concern for the conservation and improvement of the natural environment, both for its own sake as well as its importance to civilization. Environmentalists frequently speak of a planet or place faced with a plethora of grave and urgent threats; often associated with unbridled consumption, economic growth, materialism, insensitive development, and booming human numbers. Perhaps most problematic from an environmentalist perspective is the modern view that humanity's fate is divorced from that of the natural world, and that our responsibility to nature is - at best - limited to the satisfaction of shallow desires. In various ways, environmentalists and environmental groups seek to give the natural world a stronger voice in human affairs and struggle to make governments, industry and other institutions see the importance of ecology and to treat nature with greater respect. Many environmentalists see common cause with indigenous communities and other marginalized groups struggling to protect their traditional way of life or freedom from blind commerce and other global incursions. Wiki Environmentalism |
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