LG is one of the champions of direct lighting. The main advantage of direct lighting is that it can be used to increase contrast levels by turning some LEDs off - thus increasing the amount of black in parts of the picture.
There are two different methods of LED backlighting: direct and edge.
Led word clock uk series#
Though there are several different ways of backlighting using LEDs (as we'll explain shortly), the idea is the same: a series of LED bulbs throw light from behind to illuminate the LCD panel. LED backlighting has been in use in televisions since 2004 when it first appeared on Sony WEGA models. A cutaway of a CCFL-backlit LCD showing the different layers of polarisers and filters, and the thin fluorescent tubes themselves (right). It used to be the most common method of backlighting for LCD televisions, but it is quickly being superseded by LED. There are several others, and this includes Sony's Hot Cathode Fluorescent Lamp (HCFL), but only one television currently uses this method.ĬCFL backlighting consists of a series of tubes laid horizontally behind the screen. The screen on the right features a fluorescent tube backlight.Īt present, there are two main methods of backlighting in LCD flat-panels: Cold-Cathode Fluorescent Lamp (CCFL) and LED (light-emitting diode). A selection of LCD screens, including Samsung's 6 and 7 series, showing the differences between backlighting technologies.
Led word clock uk tv#
On a typical TV you have a polarised filter, followed by a protective glass layer, followed by the LCD sheet, and then a light source at the back. It's helpful to think of an LCD panel as a sandwich, consisting of different layers. It needs a light behind it because it emits no light of its own. As we all know, you need to press a button to read a watch in the dark, and an LCD TV is no different. While we've had black-and-white LCDs for years, colour LCDs are a lot more recent, but the technology is the same. As its name suggests, Liquid Crystal Display is a liquid that has been sandwiched between two plates, and it changes when a current is applied to it. But what is backlighting, anyway? Why do LCD screens need a backlight?Īs a consumer technology, LCD has been in widespread use since the early '70s where it first appeared in digital watches. How do they get away with this? Samsung's televisions use a series of Light Emitting Diodes (LEDs) - like the ones used in LED torches and alarm clocks - to "backlight" the LCD panel, and it's not the only company that does this. This isn't the same technology they use for the giant screens at football games in fact, the LED screens you see in shops are actually LCDs, and the term "LED" is the invention of Samsung's marketing department. One group member wrote: "Ooh love it, could have it next to a standard clock in kids bedroom to help them tell the time".You're walking through your local electronics store looking for a new TV, and you come across a thing called an "LED TV". Taking to the Extreme Couponing and Bargains UK Facebook group, the customer said: "Someone posted this word clock from Home Bargains for £8.99 a couple of weeks ago and I just had to buy it, just thought I would show you what it looks like, very very impressed!"īefore long, the post had received significant attention - amassing more than 2,200 likes and over 620 comments. Impress your friends with this unique, fun timepiece." The product description on the Home Bargains website states: "A new way of telling time! This LED clock displays time in words.
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READ MORE - Scottish drivers could be charged hundreds for a parking space as ‘brutal tax’ launched The "stylish and functional" clock displays the time in increments of five minutes, as opposed to showing the exact time. The bargain giant sells a Light-Up Electronic Word Clock that illuminates words displaying the time rather than traditional numbers. One Home Bargains shopper was left "very very impressed" by a light-up clock sold by the budget retailer, and was quick to share details the product online.
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