How does an LCD TV monitor work?

Photo by Manuel_Pa

Question: How does an LCD television monitor work?

Answer: An LCD color screen is a combination of inventions. You need to use light guides to take a bright light at the edge of the screen and distribute it so it looks even over the entire surface of the screen. You need liquid crystal display (LCD) technology which uses a voltage to change the polarizing tendency of the organic liquid crystal molecule and thus changes the amount of light that makes it through to the visible surface. You need thin film transistors (TFT) to control the LCD voltage for each of millions of pixels that together cover the entire visible screen. You need to arrange those pixels in groups of three to generate the range of colors possible from the mixing of red, green, and blue light in different brightnesses. You need the transparent electrodes that provide power to the TFTs without blocking the light. You need the computer processing to make the super fast control decisions that sets the color and brightness of each pixel one by one for each video frame. And you need to quickly generate one frame after another in a sequence, and thus take advantage of your persistence of vision to make a non-flickering video image.

The Engineer Guy does a great job of telling this story:

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