Essentially, a LCD (liquid crystal display) projector has a lamp in the back which emits light that is similar to a regular light-bulb. This light is then passed through a prism, where the light is split into its color components, which include the familiar rainbow colors (red, orange, yellow, green, blue, indigo, and violet). Finally, depending on which color needs to be used for each small point in the image (this is a "pixel"), the projector is able to combine these colors together to create the desired image. When the light for this image leaves the projector, it simply reflects off of the screen back to our eyes without any modifications or changing of the colors.
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