What does the screen type mean? What does the screen type mean?

About the meaning of screen type, the explanation of computer terms

Usually it can be divided into front projection screen and rear projection screen. Orthographic projection screen is divided into soft screen and hard screen, in which soft screen includes white screen, pearlescent screen and metal screen; Hard screen includes plane screen and arc screen; The rear projection screen can also be divided into soft screen and hard screen, in which hard screen is used more. Orthographic projection: manual and electric curtain hanging type; Curtains on two legs; Triangular support curtain; Metal plane, arc curtain. Rear projection screen: rigid rear projection screen (hyperbolic screen and diffusion screen) and soft rear projection screen (diffusion screen) of various specifications; Hard screen is better than soft screen.