color CRT

Color CRT (Cathode Ray Tube) displays use electron beams to excite phosphor materials coated on a glass screen. The CRT contains three electron guns—one for red, green, and blue light. These beams are precisely aimed and modulated to create images by striking the corresponding phosphor dots or stripes. When energized, the phosphors emit colored light, which combines to produce a full-color picture. The intensity and position of each beam are controlled rapidly to generate complex images, allowing for vibrant, high-resolution color displays. CRT technology was common before the widespread adoption of flat-panel LCDs and OLED screens.