In mobile devices, LED (Light-Emitting Diode) screens use a backlight made up of a series of LEDs to illuminate the display. The backlight is usually located behind the display panel and is used to provide a consistent source of light for the pixels on the screen. Each pixel on the screen is made up of three sub-pixels (red, green, and blue) that are arranged in a pattern. The backlight shines through these sub-pixels, and the intensity of each sub-pixel is controlled by the device's display driver. By adjusting the intensity of each sub-pixel, the device is able to produce a wide range of colors and shades on the screen. One advantage of LED screens is that they are relatively thin and energy-efficient, as the LEDs used in the backlight are highly efficient at converting electricity into light. LED screens are also capable of producing very bright images, which makes them well suited for use in bright environments or for displaying high dynamic range (HDR) content. There are seve...

 Near Field Communication (NFC) is a wireless communication technology that allows devices to exchange data over short distances. It operates in the 13.56 MHz frequency range and uses radio waves to transmit data between two devices. To use NFC, devices must be equipped with an NFC chip, which is a small chip that contains an antenna and a microprocessor. The antenna allows the device to transmit and receive data, while the microprocessor handles the data transmission and reception process. NFC technology is based on the principle of radio-frequency identification (RFID), which uses radio waves to transmit data between two devices. It is similar to RFID in that it uses a reader and a tag to transmit and receive data. However, NFC differs from RFID in that it operates at a much shorter range, typically less than 4 inches (10 cm). One of the main advantages of NFC is that it requires very little power to operate, making it suitable for use in battery-powered devices such as smartphon...