How does a CRT monitor create images on the screen?

A CRT monitor creates images on the screen by directing electrons towards the screen. This technology relies on a cathode ray tube where electron guns emit beams of electrons that are precisely aimed at specific spots on the phosphorescent screen. When these electrons strike the screen, they illuminate phosphor dots or stripes in red, green, and blue colors, which combine to create the full spectrum of colors in the image that you see.

This method is foundational to CRT technology, as it allows the display to create images by varying the intensity and timing of the electron beams to achieve different colors and brightness levels. The technique involves intricate timing and control, making CRTs capable of producing smooth and dynamic images.

In contrast, the other options describe different display technologies. For instance, liquid crystal layers are fundamental in LCD screens, where light is manipulated by liquid crystals rather than by directed electron beams. Projecting light through a lens relates more to projectors than to CRT displays. Finally, the concept of pixels altering colors based on input is more aligned with modern digital displays like LCDs and LEDs, rather than the electron-based methodology of CRTs.