When a P-type semiconductor is connected to the positive electrode and the N-type semiconductor is connected to the negative electrode, the electrons are activated and start to flow from the negative side to the positive.Īs these negatively charged electrons move across cross the positively charged particles, they create light.
The combination and intensity of three primary colors can produce all other colors.Light-emitting diode lights work by using two semiconducting materials cleverly arranged between its electrodes. The pixel color depends on the polarization of liquid crystals, which are controlled by thin film transistors. Each pixel has filters of three primary colors: blue, green and red.
How the TV LED reproduce the colors? The backlight LEDs emit white color, which is the sum of all other colors. How LCD works Click here Reproducing the colors In the post about the operation of LCD, I already explained how the liquid crystal works and how it polarizes the light, click in the button below to see. This figure shows the screen structure of a LCD TV, which is the same from a LED TV, except the LED matrix instead of fluorescent lamps. Has glass filters, polarizers films and a LCD layer with thin film transistors, which are electrically controlled by subpixel electrodes. The LED TV polarizes light the same way the LCD TV. How LEDs work Click here Polarizing light To know how LEDs work, click in the button below. This is an example of LED driver, your function is to increase the input DC voltage and provide a constant current to LEDs. The TV LEDs stay in a matrix and are controlled by an electronic circuit called driver. The great advantage of LEDs is the energy saving. This is the diference between the LCD TV and LED TV.
These components replaced the cold cathode fluorescent lamp (CCFL), which are part of LCD TVs. The current most advanced television in the market is the LED TV, whose operation is this post`s subject.
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