Although in writing LED is similar to OLED, it means a completely different technology.led tv price in pakistan And if OLED (Organic Light-Emitting Diode) means that the screen consists of organic light-emitting diodes, then LED (Light Emitting Diode) is the use of diodes to illuminate the matrix of an LCD TV receiver.It was done rather from a marketing point of view. In fact, this was not a new screen technology, but just a different kind of backlighting. But this name of televisions has survived and is used today.

If conventional LCD TVs use a cold cathode lamp, the same Cold Cathode Fluorescent Lamps (CCFL), then LCD LEDs use light emitting diodes. As you know, lcd  screens in televisions consist of cells (pixels) with liquid crystals and, depending on the position of the crystal in the cell, transmits light or not. This creates a glow on the screen.The quality of the LCD matrix depends on such parameters as static contrast, black level, viewing angles, refresh rate, response time. There are such technologies for the production of liquid crystal matrices for TVs: TN, IPS (S-IPS, IPS-Pro, P-IPS, AH-IPS), VA / MVA / PVA, PLS.The backlight affects such parameters as brightness, color rendering, color gamut, dynamic contrast. Although it is more correct to consider the matrix + backlight system in the TV and measure the parameters for it.

Manufacturers claim that the use of LED backlighting can increase:

• brightness,
• contrast,
• clarity of the image,
• color range.

The power consumption of LED TVs is also reduced by about 40%. Also, ice TVs do not use mercury, which is used in fluorescent lamps, which affects the environment.Indeed, modern ultra-bright LEDs can provide a high brightness of the image on the display.The contrast is increased and the concept of dynamic contrast is introduced, when the brightness of the LEDs is adjusted locally for different parts of the screen, and due to this, the dynamic contrast ratio increases. In this case, the level of static contrast of the TV remains the same, it depends on the display matrix.The black level is also improved by adjusting the light of the diodes while watching the video. geyser price in pakistan In a dark scene, the backlight level is reduced and the screen gets darker, and hence the black level improves.

But about increasing the color gamut of the TV, here you need to consider everything in more detail.Technologically, the display backlight in LCD TV is carried out from LEDs. For this, white diodes are used, the light from which falls on the light filters and get blue, green and red colors. This type is called WLED.To improve the color gamut, at first, three types of LEDs were used as backlighting: red, green, blue. This technology is called RGB LED.But it was impossible to obtain the required spectrum of light with the help of such technologies. And the color gamut was insufficient for use on UHD TVs. To solve this problem, new types of LEDs in televisions have been invented.Quantum dots in the TV replace some of the diodes, in this case red and green. All that remains is the blue LED, which forms a stream of light both to excite the quantum dots and to operate the blue sub-pixels on the screen.washing machine price in pakistan

And the flow of light onto the red and green sub-pixels forms quantum dots.