Final answer:
Dichroic filters in television cameras are used to separate light into red, blue, and green components for each pixel, which allows LCD televisions to produce a color image. By adjusting the voltage applied to liquid crystals, the intensity of each sub-pixel's color can be controlled, affecting the image contrast.
Step-by-step explanation:
The dichroic filters in a television camera play a crucial role in capturing a color image. These filters are used to separate the incoming light into red, blue, and green components, which correspond to the three primary colors of light. In flat screen LCD televisions, a large backlight illuminates the screen and passes through millions of pixels. Each pixel has three sub-pixels with red, blue, or green filters.
When the voltage applied to a pixel's liquid crystal is switched off, the liquid crystal aligns in a way that allows light to pass through one of the colored filters only. By controlling the strength of the voltage applied, one can adjust the intensity of each sub-pixel, thus varying the overall color and contrast of the image displayed on the screen.