Dot-matrix display dot-matrix display is an electronic digital display device that displays information on machines such as clocks and watches, public transport departure indicators , and many other devices requiring a simple alphanumeric display device of limited resolution .dot matrix of lights or mechanical indicators arranged in a rectangular configuration such that by switching on or off selected lights, text or graphics can be displayed . A dot matrix controller converts instructions from a processor into signals that turn on or off indicator elements in the matrix so that the required display is produced.Pixel resolutions92×31Character resolutions A common size for a character is 5×7 pixels, either separated with blank lines with no dots, or with lines of blank pixels. This is seen on most graphic calculators , such as Casio calculators or TI-82 and superior. A smaller size is 3×5. This is seen on the TI-80 calculator as a "pure", fixed-size 3×5 font, or on most 7×5 calculators as a proportional font . The disadvantage of the 7×5 matrix and smaller is that lower case characters with descenders are not practical. A matrix of 11×9 is often used to give a far superior resolution. Dot matrix displays of sufficient resolution can be programmed to emulate the customary seven-segment numeral patterns. A larger size is 5×9 pixels, which is used on many "natural display" calculators.
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