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LCD TVs produce black and brown picture selectively filtering a white light. The light is typically in a range of cold cathode fluorescent lamps (CCFLs) at the back of the screen, although some displays use instead of white or colored LEDs. Millions of individual LCD shutters, arranged in a grid, open and close to the measured amount of white light. Each relax with a colored filter to remove all the red, green and blue (RGB) light from the original white source. Each shutter-filter pair makes a sub-pixel. Sub-pixels are so small that when the display is from even a short distance from the individual colors mixed producing spot color pixels. Hue is controlled by changing the relative intensity of the light passing through the sub-pixels.
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Liquid crystals encompass a wide range of (typically) rod-shaped polymers that naturally form an ordered thin layers, as opposed to the more random alignment of a normal liquid. Some of them, nematic liquid crystals, also show the effect of the relationship between low. In particular, the direction of alignment of a nematic liquid crystal adjusted by placing it in contact with the adjustment layer or director, which is essentially a material with microscopic channels in the supporting material. When placed on the director, the layer in contact with the grooves, and the layers above it in line with the layers below, bulk materials that align Director. In the case of twisted nematic (TN) LCD screen, this effect is used by two directors arranged at right angles and placed close to each other with a liquid crystal between them. This forces the layers to adjust themselves in two directions, creating a twisted structure with each layer aligned at a slightly different angle to the people on both sides.

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