【正文】 color display can display more than 16 million kinds of colors. 2, according to display device classification LED Digital Display: 7 segment display devices for the digital control code, suitable for production of the clock screen, the interest rate screens, showing the number of electronic display. LED dotmatrix graphic display: display device is arranged by a number of uniform position of the dotmatrix LED display modules, suitable for broadcast text, image information. LED video display: display devices are formed by a number of lightemitting diodes that can display video, animation and other video files. 3, by using the occasion categories Indoor Display: LED spots smaller, general Φ3mm Φ8mm, shows the general area of a few to more than ten square meters. Outdoor Display: dozens of square meters in size to several hundred square meters, high brightness, can work in the sun, with wind, rain, water resistant. 4, classified according to light spot diameter Indoor screen: Φ3mm, , Φ5mm, Room external screen: Φ10mm, Φ12mm, Φ16mm, Φ19mm, Φ20mm, Φ21mm, Φ22mm, Φ26mm Room external screen as the basic unit of light emitting tube, LED tube principle is a set of red, green, and blue lightemitting diode sealed in a plastic barrel and jointly develop 5, Display a static, horizontal scroll, vertical scroll and flip display. One block module control drive 12 (up to control 24) 8X8 Dot Matrix, a total of 16X48 dot matrix (or 32X48 dot matrix), is a single block of MAX7219 (or PS7219, HD7279, ZLG7289 and 8279, and the like LED display driver module) 12 times (or 24 times)! Can use cascade approach the position of any large dot matrix display. Effects, good power consumption, and the MAX7219 circuit than the use of lower cost. Fifth LED applications It is a semiconductor lightemitting diode by controlling the display, which probably look like that from lots of small red lights are usually formed by the bright lights off to show character. Used to display text, graphics, images, animations, quotes, video, video signals and other information on the display screen. Graphic display and LED display into the video display by the LED matrix blocks. Graphic displays can be synchronized with the puter display Chinese characters, English text and graphics。C Another note to remember is the LCD Glass and Polarizers are not the only limiting factors in the temperature range of the LCDs. You also need to take into consideration the temperature limitations of the backlight and controller ICs that may be present along with the LCD. LCD Module Backlighting When developing an LCD Module, a backlight can be added to light the LCD and there are several options available to backlight a LCD module. The considerations in backlighting a display are the lighting intensity, life of the backlight, and the power it consumes. Here is a quick parison of the backlights available. LED: Offered in both edge and array lit, this technology is preferred due to its variety of colors, intensity, long life (100K Hrs), wide temperature range, and low voltage requirements. The downsides are the power consumption of some configurations (large sizes), and the uniformity of the lighting for those same configurations. EL Panel: This backlight is very low power, but it requires a high voltage (120VAC 400Hz Typically) and it has a relatively short life (half intensity life \4K Hrs), and medium temperature range. Cold Cathode Florescent Lamp: This backlight has a lot of intensity for the power consumed, and has its applications for the larger LCD displays. The downsides are a short life span (\20K Hrs), vibration will reduce the lifespan of the tube, limited temperature range, and the high voltage it needs to operate (300VAC 3080KHz). LCD Glare Filter It is possible to put an antireflective filter over the front of a display to improve viewability in harsh lighting conditions. This filter is bonded directly to the front polarizer of the display and its front surface either physically or chemically roughened. This surface redirect the light waves so that they continue traveling forward instead of reflecting back toward the observer. New antireflective materials can reduce the front surface reflections to less than % or less. Physical Size In general, the larger the display, the higher the price. The most expensive part of the Glass or Module LCD in most cases is the glass. Manufacturers usually use a master laminate (Sheet of glass) which is 14 x 16. We can produce a single display that size, or we can partition the array into hundreds of smaller displays . Our strategy is to maximize the number of individual displays which we can get onto this laminate. We therefore remend display sizes that give our customers maximum glass utilization. First LED Summary LED (Light Emitting Diode), lightemitting diode, is a solid state semiconductor devices, which can be directly converted into electricity to light. LED is the heart of a semiconductor chip, the chip is attached to one end of a stent, is the negative side, the other end of the power of the cathode, the entire chip package to be epoxy resin. Semiconductor chip is posed of two parts, part of the Ptype semiconductor, it inside the holedominated, the other side is the Ntype semiconductor, here is mainly electronic. But linking the two semiconductors, among them the formation of a PN junction. When the current through the wires role in this chip, will be pushing eP, P zone in the hole with electronic posite, and then to be issued in the form of photon energy, and this is the principle of LED luminescence. The wavelength of light that is the color of light, is formed by the PN junction of the decisions of the material. Second LED history and development 50 years ago, people have to understand semiconductor mater