Because it Strikes across the Screen > 자유게시판

­If you have ever been to a sporting event that has a large-display Tv in the stadium, then you might have witnessed the gigantic and amazing shows that make the games so much simpler to follow. On the Television, they will display on the spot replays, shut-ups and player profiles. You also see these giant-display screen TVs at race tracks, concerts and EcoLight lighting in massive public areas like Instances Sq. in New York City. Have you ever ever questioned how they can create a tv that's 30 or 60 feet (10 to 20 meters) excessive? In this text, we are going to take a look at the LED know-how that makes these big shows potential! If in case you have learn How Television Works, then you understand how a television that uses a cathode ray tube (CRT) does this. The electron beam in a CRT paints throughout the display screen one line at a time. As it strikes across the screen, EcoLight dimmable the beam energizes small dots of phosphor, which then produce light that we can see.

The video sign tells the CRT beam what its intensity ought to be because it moves across the display screen. You may see in the following determine the way that the video signal carries the intensity information. The initial five-microsecond pulse at zero volts (the horizontal retrace signal) tells the electron beam that it is time to start out a brand new line. The beam begins painting on the left side of the display, and zips across the screen in forty two microseconds. The various voltage following the horizontal retrace signal adjusts the electron beam to be shiny or darkish because it shoots across. The electron beam paints lines down the face of the CRT, and then receives a vertical retrace sign telling it to begin once more on the higher proper-hand nook. A colour display does the identical factor, but makes use of three separate electron beams and 3 dots of phosphor (red, green and blue) for each pixel on the display.

A separate colour sign signifies the shade of every pixel as the electron beam moves across the show. The electrons in the electron beam excite a small dot of phosphor and the display lights up. By rapidly painting 480 lines on the display screen at a rate of 30 frames per second, the Television display permits the attention to integrate every little thing right into a easy shifting picture. CRT know-how works great indoors, but as quickly as you put a CRT-primarily based Tv set outdoors in shiny sunlight, you can't see the display anymore. The phosphor on the CRT simply is not vivid sufficient to compete with sunlight. Additionally, CRT displays are limited to about a 36-inch screen. You need a different technology to create a large, EcoLight dimmable outside display screen that is brilliant enough to compete with sunlight. It is likely to be 60 feet (20 meters) excessive instead of 18 inches (0.5 meters) high. It is incredibly brilliant so that folks can see it in sunlight. To perform these feats, EcoLight energy nearly all large-display outside displays use gentle emitting diodes (LEDs) to create the picture.

Modern LEDs are small, extremely vibrant and EcoLight dimmable use relatively little power for the sunshine that they produce. Other places you now see LEDs used outdoors are on visitors lights and car brake lights. In a jumbo Television, purple, inexperienced and EcoLight blue LEDs are used as an alternative of phosphor. A "pixel" on a jumbo Tv is a small module that may have as few as three or four LEDs in it (one red, one green and one blue). In the largest jumbo TVs, each pixel module might have dozens of LEDs. Pixel modules typically vary from 4 mm to four cm (about 0.2 to 1.5 inches) in size. To construct a jumbo Television, you are taking thousands of these LED modules and EcoLight solutions arrange them in a rectangular grid. For example, the grid might comprise 640 by 480 LED modules, or 307,200 modules. To manage a huge LED screen like this, you employ a pc system, a power management system and numerous wiring.

The pc system appears at the incoming Tv signal and decides which LEDs it should activate and the way brightly. The pc samples the depth and coloration signals and interprets them into depth data for the three different LED colours at each pixel module. The facility system provides power to all the LED modules, and modulates the facility so that each LED has the right brightness. Turning on all of those LEDs can use lots of energy. A typical 20-meter jumbo Television can eat as much as 1.2 watts per pixel, or roughly 300,000 watts for the full display. Several wires run to every LED module, so there are lots of wires working behind the screen. As LED prices have dropped, jumbo Television screens have started to pop up in all sorts of places, and in all sorts of sizes. You now discover LED TVs indoors (in locations like shopping malls and workplace buildings) and in all kinds of outside environments -- particularly areas that entice lots of tourists. For more info on LED screens and associated topics, take a look at the links on the next page. The large screens at concert events are known as jumbotron or typically jumbovision.