Monitor and televion using Led technology

Under development for already a few years, the screens and TV using the LED have arrived in the trade but with two distinct technology. The large advantage of LED diodes compared to technologies of standard lighting is related to a supply voltage weaker than the electroluminescent lamps or even Neon, which results with final in a lower power used (thus a less consumption). Second is related to the obstruction, weaker than other technologies. On the other hand, their defect is to heat when they remain lit too a long time. The current developments made it possible to increase the luminosity but also to reduce these problems of temperature.

To include/understand the first method of operation by currently taking again the most current technology LCD, for posting. A flagstone (a kind of plate) made up of neon lights a panel made up of liquid crystals. These crystals are managed not transistors (currently) which direct them to let pass or not the light coming from the flagstone. Then, polarizing filters,…

The first method will replace neons by LED. The first advantage is related to the lower consumption (but you know that neon consumes especially with starting but requires a high supply voltage). With a weak supply voltage, these monitors and televisions can do without Inverter (a small economy but not very profitable compared to the cost price). On the other hand, any conversion of tension results automatically in losses of powers. Approximately, the energy saving becomes significant with the evolution of this type of diodes, with the detriment currently of the price of manufacture.

The second method is more aesthetic than technical. While placing these electroluminescent diodes either with the back of liquid crystals but on with dimensions one of the screen, one reduces the width of the screen (one arrives now at less than 3 centimetres, approximately, reduction by half). Well? For the design perhaps but in energy term of profitability, much less since the light is diffuse before lighting the screen. This manufacturing method is mainly dedicated to televisions “design”.

The third technology is definitely different (one speaks about OLED). One takes again bases of electronics to remember that certain LED use several models of different colors in the same case (a common mass and a leg - limits - to manage each color) and precisely, posting consists of three basic colors. You included/understood? And yes, one will use this type of diode with the three basic colors like flagstone. One summarizes a little: one does without the inverter since there are no conversion high voltage and liquid crystals since each point is posted using this type of component. But still… This solution makes it possible to regulate the luminosity of each color for each point of the screen. Too much beautiful to be true except the current problems of manufacture which prevent from exceeding small sizes and… that the interest is limited enough for a user point by point to regulate the luminosity of your screen or your television. However, this solution also makes it possible in manufacture to regulate by a software the minor problems related to disparities of output of the components (but not sure either that the overfed components will hold very a long time).

But still, the LED have just minor problems, they emit by defect a light rather blue, it is a colouring which gives them their real color of lighting, from where again a loss of luminosity. All the work of the current developments… 

One finds various uses in data processing of this component, in particular for a type of printer related to the laser technology, in Ethernet connections which use fiberoptic at small distances,…

Other technologies: CRT, plasma,…