Welcome to the Era of LED and LCD TVs
LED Televisions: An LED display can be defined most accurately and simply as a display panel in which light-emitting diodes are used for displaying videos on screen. The full form of LED is Light Emitting Diode, although many people do not know this. For many years, LED displays have been used as billboards and signs, seen outside shops, sports arenas, or along highways. Recently, LEDs have become a good source of light, most commonly used for task lighting and in flashlights. At the same time, LED panels have been gaining a lot of popularity in televisions. There is a dramatic differentiation in LED televisions depending on the market segment. LED display panels can be classified into two types: the conventional type, most commonly associated with large signs or billboards, and surface mounted. Usually, in conventional LEDs, a set of mounted LEDs, in blue, green and red, are used to create the display. Each unit is normally one pixel and a square. The spacing of these pixels is very even over the entire screen, and because of this, the LED display gets its pixilated look. From far, these kinds of displays look very good and can achieve a nice, smooth curve. But from a closer distance, display quality diminishes as the pixilation becomes apparent. Surface-mounted displays use a chip, on which green, blue and red diodes are mounted. Then, these chips are mounted to a PC board. Surface-mounted displays are much better than conventional LED panels because the diodes and chips are very small, which means more pixels are obtained per inch. That translates into much better definition, in other words, much less pixilation. Even when looking at a surface-mounted LED display close up, the picture quality is not lost. LCD Televisions: An LCD TV is a flat panel television utilizes the basic Liquid Crystal Display technology which has been in use in display panels in cell phones, camcorder viewfinders, and computer monitors. LCD panels are made of two layers of a glass-like material, which are polarized, and are "glued" together. One of the layers is coated with a special polymer that holds the individual liquid crystals. Electric current is then passed through individual crystals, which allow the crystals to pass or block light to create images. LCD crystals do not produce their own light, so an external light source, such as florescent or LED bulb is needed for the image created by the LCD to become visible to the viewer. Unlike standard CRT and Plasma televisions, there are no
phosphors that light up, and, thus LCD panels are thin and require less power to operate. Because of the nature of LCD technology, there is no radiation emitted from the screen itself, unlike traditional televisions. Unlike traditional CRT televisions, the images on an LCD TV are not "scanned" by an electron beam. The pixels of an LCD Television are merely turned off or on at a specific refresh rate. In other words, the entire image is displayed (or refreshed) all at once every 24th, 30th, 60th, or 120th of a second. Back to televisions … You may be surprised to know that LEDs are most commonly used in televisions. Years ago, the technology wasn’t so advanced. Mitchell, a scientist, pioneered the technology of LED and LCD televisions. He stated that these emerging technologies would be very useful for the creation of lighter and thinner panels, as compared to the cathode ray tube and conventional televisions commonplace at the time. It’s taken almost 30 years to for LED televisions to evolve to where they are today, and many manufacturers try to differentiate their products when it comes to LED TV and LCD televisions. At Gibbys Electronic Supermarket, you can compare the two formats and various models sideby-side. Their knowledgeable staff can highlight the differences and answer your questions.
Published on Oct 19, 2012
Nowadays, traditional televisions have been replaced with LCD and LED televisions. Various brands are currently found in the market.