Provided are a display screen, a display screen assembly, and a terminal. The display screen includes a display panel and an optical film. The display panel includes a display surface and a side surface. The display surface is configured to display an image. The display surface includes a non-display region and a display region. The non-display region surrounds the display region. The side surface surrounds the periphery of the display surface. The optical film includes a lightproof portion and a light-transmitting portion. The light-transmitting portion is stacked on the display region, and correspondingly covers the display region. The lightproof portion is fixedly connected to the light-transmitting portion. The lightproof portion is stacked on the side surface and the non-display region, and correspondingly covers the side surface and the non-display region.