The matrix of dots on a CRT screen(or TV set) that emit light when bombarded by an electron beam. In colour displays three different types of dots, emitting the colours red, green or blue, are tightly clustered.

• 阴极射线管（CRT）或电视（TV）屏幕上的点阵列，当电子束击中时会发光。在彩色显示器中，三种不同光点分别发出红（R）、绿（G）、蓝（B）三种颜色聚成一束的光。