1, diode dot matrixSince the eighties there Combined LED dot matrix display with LED pixels, which uses high-brightness light-emitting diode grandstand play combination core, epoxy resin and modeling packages. accomplished brightness, low power consumption, pin count, angle, long life, moisture, cold-resistant, corrosion-resistant and so on. Dot matrix display has two types of monochrome and color, can display red, yellow, green, orange also therefore on. LED mark matrix with 4 ‚ƒ- 4,4 ‚ƒ- 8,5 ‚ƒ- 7,5 ‚ƒ- 8,8 ‚ƒ- 8,16 ‚ƒ- 16,24 ‚ƒ- 24,40 ‚ƒ- 40 also so on;Divided according to the number of pixels further so on, two-color, three color, etc., according to the different color pixels displayed text, pictures and divers content are also different, single color dot matrix demonstrate only a fixed color double as red, green, yellow, etc. monochrome, dual-color and three-color dot-matrix display pixel color from the color of LED lights of inconsistent combinations of decisions, such as red and green are effulgent yellow when displayed, if the pulsed irradiated diode oversee time, be with 256 or higher grayscale display, you can achieve true color display. Figure 1 – 5 a couple of LED dot matrix display displays the internal circuit structure besides shape specifications, at variance models and broach speck matrix structure of experiment.LED dot matrix displays use a single block, can replace the digital display numbers, however also can display a variety of Chinese and Western characters further symbols. Such as the 5×7 dot matrix display that shows the Western alphabet. 5 ‚ƒ- 8 iota matrix demonstrate for displaying Chinese and Western culture, 8×8 dot matrix is used to display Chinese characters can also be misused for photographs display. Dot matrix display with a multi-block combination can constitute a large-screen display, but such practical devices commonly driven by computer or microprocessor controlled.2, LED dot matrix scan driver program:LED dot matrix display by the internal structure known, the device should reaction with dynamic deal with driver mode, LED die primarily because of high blaze type, so a diverse row or a column of LED invasion current measure can be used, but the average current deserve to be limited to within 20mA. Most iota matrix exhibit LED’s forward voltage bob monomer approximately 2V or ergo. But the highlight of 10 dot matrix display LED’s ahead voltage drop of about single 6V.Large screen display device is generally composed by a small number of LED dot matrix slab with a combination of building-block approach, each small module has its grant out oversee system, combined lie low the introduction of a doorpost as want through the total pilot command and data of both module can be, this method is simple but additionally easy to show, effortless maintenance features.3, LED dot matrix display system ascendancy each module is displayed:There are two static and dynamic display. Static display is simple, effortless to control, but the complexity of the hardware connection, commonly used guidance practical applications the dynamic display, dynamic reveal of work by scanning the way, from a large narrow peak pulse drive, constantly on the screen from top to bottom successive gating all the rows, while the monolith to the graphics or issue lore despatched that the pulse signal, the elder cycle periodic operations, can display a variety of graphics or text message.
