Final answer:
LCDs contain a backlight and pixels with red, blue, or green filters. Voltage applied to liquid crystals controls light passage and picture contrast. Polarization allows liquid crystals to rotate light, forming images on the screen.
Step-by-step explanation:
Components of Liquid Crystal Displays (LCDs)
Flat screen LCD televisions contain a large light at the back, which moves through millions of tiny units known as pixels. Each pixel has three sub-pixels or cells, containing red, blue, or green filters, which can be controlled independently. The light from the backlight passes through these cells when the voltage across the liquid crystal is off, allowing the light to filter through. The liquid crystal's ability to control the passage of light is due to its properties of polarization and its ability to rotate the polarization of light. By varying the voltage applied to the liquid crystal cells, one can manipulate the picture contrast to create the desired image on the screen.
Processor components, such as silicon and various metals like copper, tin, and gold, are also present in electronic devices, as well as more uncommon elements like yttrium and gadolinium.
The technology behind LCDs is founded on the concept of polarization where liquid crystals align their molecules and can rotate the polarization of light through them by 90°. This effect can be controlled by applying voltage, which is used to define the contrast patterns on the display.