A Monitor or Display
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MONITORS A monitor or display (sometimes called a visual display unit ) is an electronic visual display for computers. The monitor comprises the display device, circuitry, and an enclosure. The display device in modern monitors is typically a thin film transistor liquid crystal display (TFT-LCD), while older monitors use a cathode ray tube (CRT). PIXELS In digital imaging, a pixel (or picture element [1] ) is a single point in a raster image. The pixel is the smallest addressable screen element; it is the smallest unit of picture that can be controlled. Each pixel has its own address. The address of a pixel corresponds to its coordinates. Pixels are normally arranged in a 2- dimensional grid, and are often represented using dots or squares. Each pixel is a sample of an original image; more samples typically provide more accurate representations of the original. The intensity of each pixel is variable. In color image systems, a color is typically represented by three or four component intensities such as red, green, and blue , or cyan, magenta, yellow, and black . An image that is 2048 pixels in width and 1536 pixels in height has a total of 2048×1536 = 3,145,728 pixels or 3.1 megapixels. One could refer to it as 2048 by 1536 or a 3.1-megapixel image. Bits per pixel The number of distinct colors that can be represented by a pixel depends on the number of bits per pixel (bpp). A 1 bpp image uses 1-bit for each pixel, so each pixel can be either on or off. Each additional bit doubles the number of colors available, so a 2 bpp image can have 4 colors, and a 3 bpp image can have 8 colors: • 1 bpp, 2 1 = 2 colors (monochrome) • 2 bpp, 2 2 = 4 colors • 3 bpp, 2 3 = 8 color • 8 bpp, 2 8 = 256 colors • 16 bpp, 2 16 = 65,536 colors ("Highcolor " ) • 24 bpp, 2 24 ≈ 16.8 million colors (" Truecolor ")
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