Color Black

Color Black

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How do television/LCD screens make the color black?

Is it black light, the absence of color, or an optical strategy using multiple colors? Is it possible to create a black light?

I am not sure what length of answer you are looking for, so I will give you some short and long answers

Short answer: You can't have black light. As you mentioned, black is literally the absence of light. Ideally, your monitor or LCD "makes" black by not lighting up the pixels, just like your printer "makes" white by not spitting any ink on the page

Long answer: Creating a black light: You might want to check out a wikipedia article on Color Theory ( http://en.wikipedia.org/wiki/Color_theory ). If you put certain colors together, they actually "cancel" each other out, and appear darker. ANY WAVE, be it microwave, radio, light, or sound, can be CANCELED out by another wave in the opposite phase.
Anti-noise is a good example of wave canceling, and you can find Noise Canceling Headphones that apply this concept. This can be done, theoretically, in the same way with light.
Let's say for argument's sake your LCD is smart. And there's a glare of yellowish light coming through the window, and it's bouncing off making a glare. Your eye will look at the pixel and "see" a yellowish color, which you don't want. Now, since your LCD is smart, it detects a yellowish light in a positive phase, so it "lights" the pixel with the same yellowish light in the negative phase. By the time the light hits your eye, the positive and the negative light will have canceled each other out, so you will see Black. Since there was an existing yellowish color from the window, and the LCD made it look black, it "made" a black light.
Now, unfortunately, there is no LCD that is NEARLY that smart, and probably won't be for a long time. However, in that sense, it is possible to make a "black light" by putting out the same type of light you see, but in a different phase, which kills the light and "creates" black. Other than that, black really is just the absence of light.

Christy Moore - Black Is The Colour

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